Ракетный блок. Delta 4 - 2. [Редактировать]

Технические характеристики

#ХарактеристикаЗначение
1Длина, метра12
2Топливоводород + кислород
3Тяга (вакум), кНьютон110.050
4Удельный импульс, с462
5Время работы, секунд850
6Масса, кг24170
7Масса (сухая), кг2850
8Диаметр, метра2.44
9Двигатель 1xRL 10B-2

Найдено 1000 документов по запросу «Delta 4 - 2». [Перейти к поиску]


Дата загрузки: 2017-10-09
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0.06/5
... Alpha/Delta Катушка зажигания Мопед Alpha/Delta Кикстартер Мопед Alpha/Delta Клапаны 70см3 (компл 2шт.) Мопед Alpha/Delta Ключ свечной 4х- тактн. Мопед Alpha/Delta Коленвал 110см3 Мопед Alpha/Delta Коленвал 70см3 Мопед Alpha/Delta Колодки... задние Мопед Alpha/Delta Колодки тормозные передние Мопед Alpha/Delta Колпачек свечной 4х-тактн. Мопед Alpha/Delta Колпачки маслосъемные Мопед Alpha/Delta... Alpha/Delta/кит. Скутер (компл.) Коммутатор Мопед Alpha/Delta Коромысла Мопед Alpha/Delta... Alpha/Delta КПП в сборе (сепаратор) Мопед Alpha/Delta Крепление руля Мопед Alpha/Delta... заднее Мопед Alpha/Delta Крыло переднее Мопед Alpha/Delta Крышка боковая левая... Мопед Alpha/Delta Крышка головки правая 70см3 Мопед Alpha/Delta Крышка картера...) Мопед Alpha/Delta Крышка картера правая 70см3 Мопед Alpha/Delta Крышка клапана (круглая) Мопед Alpha/Delta Крышка коленвала с сальниками 70см3 Мопед Alpha/Delta Лампа габарит... Delta Механизм п/п (1-N-2-3-4) барабан с вилками Мопед Alpha/Delta Механизм п/п (N-1-2-3-4) барабан с вилками Мопед Alpha/Delta Муфта задней звезды Мопед Alpha/Delta.../Delta Набор прокладок 110см3 Мопед Alpha/Delta Набор прокладок 70см3 Мопед Alpha/Delta... Мопед Delta Набор сальников двигателя Мопед Alpha/Delta Направляющие клапанов Мопед Alpha/Delta (пара) Насос масляный 70см3 Мопед Alpha/Delta... Мопед Alpha/Delta Обод ЗАДНИЙ литой в сборе Мопед Alpha/Delta Обод ПЕРЕДНИЙ литой в сборе Мопед Alpha/Delta Основание задн.../Delta Ось задн. колеса M12*210 Мопед Alpha/Delta Ось маятника Мопед Delta Ось передн. колеса M10*185 Мопед Alpha/Delta... км/ч Мопед Alpha/Delta Патрубок карбюратора (металл) Мопед Delta Патрубок карбюратора 110см3... Alpha/Delta Педаль заднего тормоза Мопед Alpha/Delta Педаль п/п Мопед Alpha/Delta Перья... (с загибом под глушитель) Мопед Delta Подножка пассажира Мопед Delta (пара) Подножки пассажира... центральная Мопед Delta Подшипник 6300 переднего колеса Мопед Alpha/Delta Подшипник 6301 заднего колеса Мопед Alpha/Delta Подшипник руля Мопед Alpha/Delta...+6001) Мопед Alpha/Delta Подшипники КПП сепараторные Мопед Alpha/Delta (кт.2шт... Мопед Alpha/Delta Поршень в сборе d52,4 110см3 Мопед Alpha/Delta Предохранитель (корпус в сборе) Мопед Alpha/Delta Пробка бензобака Мопед... Delta с ключом Проводка Мопед Alpha Проводка Мопед Delta Прокладка глушителя Мопед Alpha/Delta Прокладка карбюратора (текстолит) 70см3 Мопед Alpha/Delta Проставки амортизатора 30мм (пара) Мопед Alpha/Delta Пружина бокового упора Мопед Alpha/Delta Пружина вала кикстартера Мопед Alpha/Delta Пружина вала п/п Мопед Alpha/Delta Пружина задней лягушки Мопед Alpha/Delta... тормоза Мопед Alpha/Delta Пружина центральной подставки Мопед Alpha/Delta Пульты Мопед Alpha (компл) Пульты Мопед Delta (компл) Распредвал клапанов Мопед Alpha/Delta Редуктор (шестерни) спидометра Мопед Alpha/Delta... Alpha/Delta Реле поворотов с пищалкой Мопед Alpha/Delta Реле стартера Мопед Alpha/Delta Реле-регулятор 110см3 мопед Delta/Alpha.../Delta Рем. комплект обгонной муфты Мопед Alpha/Delta Ролики ГРМ Мопед Alpha/Delta.../Delta Рычаг тормозного барабана Мопед Alpha/Delta Рычаги сц./торм. Мопед Alpha/Delta Сайлентблок амортизатора d=10мм Мопед Alpha/Delta Сайлентблок амортизатора d=12мм Мопед Alpha/Delta Сайлентблок маятника Мопед Alpha/Delta... заднее Мопед Delta Седло Мопед Alpha Седло переднее Мопед Delta Сигнал звуковой... Мопед Alpha/Delta Статор (5+1 катушек) 70см3 Мопед Alpha/Delta/Active Стопор/фиксатор... Мопед Alpha/Delta Съемник гайки барабана сцепления Мопед Alpha/Delta Съемник-выжимка... Трос сцепления Мопед Delta Тяга тормозная Мопед Alpha/Delta в сборе Фильтр бензиновый... Мопед Alpha/Delta ЦПГ(поршневая) 100см3 50мм Мопед Alpha/Delta ЦПГ(поршневая... Мопед Alpha/Delta Шестерня распредвала ГРМ 70см3 (металл) мопед Delta/Alpha Шестерня сцепления Мопед Alpha/Delta Шпильки цилиндра 110см3 Мопед Alpha/Delta.../Delta Щуп масляный 70см3 Мопед Alpha/Delta Электостартер 70см3 (верхний) Мопед Alpha/Delta... KATANA 110см3 мопед Delta/alpha Коленвал KATANA 125см3 мопед Delta/alpha Коленвал...-150 Поворот Delta/Alpha #1 HY-335 (резиновая ножка) Поворот Delta/Alpha #3 MT-2022 (резиновая ножка) Поворот Delta/Alpha #4 MT...



Дата загрузки: 2017-09-24
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...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Analyte  Analyte... Number  15121011  N. Force Ave. and W.  Delta Park  N. Force Ave. (south  end...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  U  10.37  N. Force Ave. and W.  Delta Park  15121002  Trip Blank  15121003... Blank  15121012  N. Force Ave. and W.  Delta Park  15121013  N. Force Ave. (south...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach... text)  Location  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Sample Number... Blank  15121011  N. Force Ave. and W.  Delta Park  N. Force Ave. (south  end... Number  15121011  N. Force Ave. and W.  Delta Park  N. Force Ave. (south  end...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach... Trip Blank  N. Force Ave. and W.  Delta Park  15121013  Analyte Reference  Number...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Sample Number...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Sample Number... E‐UHFFFAOYSA‐N  3.1  0.71  U N. Force Ave. and W.  Delta Park  N. Force Ave. (south  end...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  15121012  m,p‐Xylenes  N. Force Ave. and W.  Delta Park  15121013  m,p‐Xylenes  N. Force Ave...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach...  Course (JB02)  N. Force Ave. and W.  Delta Park  Trip Blank  Jantzen Beach... Trip Blank  N. Force Ave. and W.  Delta Park  15121001  Methyl Methacrylate  Analyte...  15121011  Location  N. Force Ave. and W.  Delta Park  Sample Number  15121002  Analyte...



Дата загрузки: 2017-09-25
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0.1/5
... – Heavy Class Medium Class Delta II Atlas V Delta IV Delta IV Heavy Figure... versatile families of Atlas and Delta expendable launch vehicles. ULA launch... flexibility NASA certified Atlas and Delta launch vehicles 100% mission success... offer three launch vehicles families (Delta II, Delta IV and Atlas V) that... modular capability of Atlas V and Delta IV can enable launch being... ISS launch activities. Atlas V and Delta IV launch vehicles were designed... Practices and Contracting Atlas and Delta have contracted for commercial launch... inherent in the Atlas and Delta families of launch vehicles ensure... (Payload provided in mT) IOC Delta IV LV Payload MLV+(4,0) 1.5 D-HLV... well suited. The Atlas V and Delta IV launch systems, developed to... NLS contracts for Atlas V and Delta IV plus any special integration... Attached Operations ULA’s Atlas and Delta rockets can accurately deliver payloads... coast periods, the Atlas and Delta vehicles have delivered payloads to... ISS rendezvous. Figure 5: Atlas V and Delta IV flight demonstrated injection accuracies... Support Services ULA’s Atlas and Delta launch systems are fully operational... launch teams. Using Atlas and Delta launch systems provides NASA the... capabilities of the Atlas V and Delta IV control centers for successful... requirements against the Atlas and Delta launch system and infrastructure capabilities... compatibility assessments is provided below. Delta IV Launch Vehicle—Automated Transfer... between the ATV and Delta IV. The Delta team worked closely with... studies were performed using a tailored Delta Mission Integration process, effectively performed... analysis. Using this process, the Delta team evaluated the structural, environmental... compatibility between the Delta IV Heavy launch vehicle, Delta IV processing facilities, and the ATV spacecraft. Existing Delta IV... a low risk HTV integration effort. Delta IV Launch Vehicle—H-II Transfer... Vehicle (HTV) and the Delta IV. The Delta team worked closely with... studies were performed using a tailored Delta Mission Integration process, effectively performed... analysis. Using this process, the Delta team evaluated the structural, environmental... compatibility between the Delta IV Heavy launch vehicle, Delta IV processing facilities... the and HTV spacecraft. Existing Delta IV launch and processing facilities... on the Delta IV Heavy. Begun in 2004, the HTV/Delta IV... with both the Atlas V and Delta IV launch vehicle families. Composed... Payload to Orbit Requirements The Delta and Atlas families have a long... inter-planetary missions. In all, Delta has completed 132 launches over... launches, 14 Delta IV Medium-class, and five xx Delta IV Heavy... and extensive cooperation in using Delta and Atlas further reduces NASA... to ISS, a 25% improvement. ULA’s Delta II family can carry payloads...-coast capable Delta II’s in inventory. An additional six Delta II Heavies... considering the option to continue Delta II beyond the existing vehicles... several other options for supporting Delta II-class missions as well... have substantial performance margins over Delta II, the cost effectiveness of... keep payload capabilities within the Delta II range while taking advantage... infrastructure cost coverage, a hybrid Atlas-Delta II could be developed using... Atlas V Common Core Booster and a Delta II second stage, payload fairing...-payload concepts which can provide Delta II-class capabilities (and beyond...-payload Carrier Options While the Delta and Atlas launch systems have... development of a launch in 2009. Delta II has an extensive history...’s dual payload carrier (DPC) on a Delta IV-H or Atlas 551 provides... packaging on either Atlas or Delta system using common hardware. The... Alliance developed the Atlas V and Delta IV launch systems to deliver... of successful launches, Atlas V and Delta IV provide the highest level... launch services industry! Atlas and Delta have entered into a significant new... significant benefits to Atlas and Delta as follows: • • • • • • • • Higher system reliability... now available to Atlas and Delta Retired program risks with operational flights of Atlas V and Delta IV configurations prior to U.S. Government... ramp up of Atlas V and Delta IV Continuous industrial base support... category 3 certification for Atlas V and Delta IV Fostered competition in civil...-68A, which will provide increased Delta IV Heavy capability through a customer...-10 configuration between Atlas and Delta, increasing reliability, lower cost, and... The Best of Centaur and Delta Heritage to Provide Enhanced Customer... United States nationals. Both the Delta IV and Atlas V launch vehicles... Services contracts. Using Atlas V or Delta IV for NASA Space Transportation... two vehicle lines, Atlas V and Delta IV specifically. ULA meets the... staffed and tooled to build 7 Delta IV boosters annually in a 1-shift... of Delta II. Even now, Decatur currently can build 12 Delta II... processing flows provided in the Delta IV and Atlas V payload planner..., for a fully encapsulated payload on Delta IV, access ends 10 days...



Дата загрузки: 2017-10-09
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... to Specific Orbits ...........................................................................................................................2–15  Figure 2-4 Delta Family of Launch Vehicles and... and 2005 .......................................................................................................... 3–24  Table 3-4 Measured Delta II Sound Levels, July 1992...: the Athena family, Atlas V family, Delta family, Taurus family, Pegasus XL... vehicle. On the Atlas V and Delta IV evolved expendable launch vehicles... that of a Delta II, and the environmental impacts of a Delta II were... EA August 17, 2011 Name Delta II Delta II-H Motor type 1st... 3rd stage: Star-48B Motor Delta IV Delta IV-H Single Common Booster... Athena family Atlas V Family Delta II Family Delta IV Family Falcon 1/1e.... 2.1.3.2 Delta Family of Launch Vehicles The Delta Family (see Figure 2-4) consists of Delta II, IV, and Delta IV Heavy. The Delta III launch... service. Source: Boeing 1999. Figure 2-4 Delta Family of Launch Vehicles and... Lifted to Specific Orbits Delta II: The Delta II is a two- or... Boeing renumbered the Delta II series during the Delta IV’s development phase). The first stage of a Delta II...) to GTO (Boeing 1999). Delta IV: The Delta IV family is a suite... Delta IV Medium (Delta IV-M), three versions of the Delta IV Medium-Plus (Delta IV-M+), and the Delta IV Heavy (Delta IV... used on the Delta IV-M as well as the Delta IV-M+. The... used on the Delta IV-M+ (5,2) as well as the Delta IV-H. Both second-stage configurations use the Delta III cryogenic Pratt & Whitney RL10B-2 engine. The Delta IV... VAFB (Boeing 1999). The first Delta IV-M+ launch occurred in November... lb) Delta IV (4 SRMs) LC-37 Delta IV-H LC-37 Delta II-H LC... the Delta II and, in the past, Delta III vehicles. The Delta II... 9 LDXL GEMs) Delta IV (4 SRMs) Propellant Launch Complex SLC-6 Delta IV-H SLC... of one launch pad, a blockhouse, a Delta operations building, shops, a supply building... of one launch pad, the Delta Operations Center, an integrated processing... prepare, service, and launch the Delta IV vehicles. California Spaceport (SLC... can accommodate future expansion to Delta class vehicles. This pad is... Lockheed Martin Atlas V and Boeing Delta IV evolved ELV missions. The... 3.2 km (2 mi) southeast of the Delta II launch complex (SLC-2). Building... Athena, Pegasus, Taurus, Atlas and Delta families 2–43 NASA Routine Payload... sound pressure levels. Table 3-4 Measured Delta II Sound Levels, July 1992... the public during some Atlas, Delta, and Titan launches. Ocean Beach... CO2 HCL NO* Delta (3C) CO CO2 HCL NOa Delta (6C) CO... Vandenberg Air Force Base (VAFB), Delta II 2,925 (largest hypergolic propellant... family, the Atlas V family, the Delta family, the Pegasus family, the..., they represent: (a) LH2/LOX engines (Delta IV-H), (b) RP-1/LOX engines (Atlas...), (d) LH2/LOX engines with SSRMs (Delta IV M+ (5,4), and (e) RP-1/LOX engines... Atlas V 551/552 Atlas V H Delta IV M+ Delta IV-H Falcon 1 Falcon 9 Titan II.../H2 Delta IV H2O, (NOx, HOx) LOX/RP-1 Atlas series, Delta II, Falcon series NTO/Aerozine-50 Delta II, Titan..., NOx, (HOx, soot) Solid Atlas & Delta series with SRMs Taurus, Pegasus... containment. The reliability of the Delta II launch vehicle is estimated... 10.9 Delta IV launches from CCAFS, and 3.3 Atlas V and 3.3 Delta IV launches... V 551/552 Atlas V Heavy Delta IV H Delta IV M+(5,4) Averaging Time NOX (ppm... the chemical concentrations resulting from a Delta II fireball (deflagration) as predicted... convention would refer to Delta II 7925 as Delta II 2925. Source... document predicted concentrations resulting from a Delta II fireball. Biological Impacts from.... Acid and particulate deposition for Delta launches has extended less than... smaller launch clouds produced by Delta, Atlas, and Titan launches have... that could be attributed to Delta, Atlas, or Titan launches (Schmalzer... Atlas V 551/552 Atlas V Heavy Delta IV H Delta IV M+ (5,4) Averaging Time NOX... Company), 1999, The Boeing Company, Delta IV Payload Planner’s Guide, October... Safety, Health, and Environmental Affairs, Delta II/IV Launch Operations, VAFB.... Boeing (The Boeing Company), 2007, Delta IV Payload Planner’s Guide, September.../Boeing-Delta-IV-PayloadPlanners-Guide. Boeing (The Boeing Company), 2010a, Delta II.... Boeing (The Boeing Company), 2010b, Delta IV Overview, Boeing website, last.../2010/0325_ss_athena.html McInerny, S. A., 1993, Delta Launch Sound Levels at 1500... Stratospheric Ozone Depletion Associated with Delta II Rocket Emissions, Geophys. Res...., 1998, Monitoring Direct Effects of Delta, Atlas, and Titan Launches from..., Final Environmental Assessment for the Delta III Launch Vehicle Program Cape... Final Environmental Assessment for the Delta III Launch Vehicle Program, Cape... V Family Athena I,IIc, IIIa Delta II Family Delta IV Family Falcon 1/1e...



Дата загрузки: 2017-09-24
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... Pressures Velocity increment, also called delta-V Specific impulse Efficiency of specific... concerning the further usage High delta-V NSM of the remaining propellant... main proportion of the Low delta-V NSM total mass consumption. As... two different delta-V types (cf. III.A): high delta-V and low delta-V (Fig. 1). Both... a correct prediction of the total delta-V necessary for maintaining the orbit... SKM to fulfill the annual delta-V. Due to the design of... this paper, a fixed delta-V for NSM and a variable delta-V for EWM are... operation activities the simulated annual delta-V from the SKM simulation is... to the real performed annual delta-V in retrospect, in order to... for the PEP: ∙ Annual delta-V and total delta-V ∙ Number of annual SKM...-between EWM and NSM Annual delta-V, m/s 1. Orbit Perturbations and their Effects... the orbit. While the Accumulated delta-V solar radiation pressure changes the... accumulated delta-V 50.00 eccentricity of the orbit, the Annual delta-V 600... the Figure 2. Accumulated delta-V compared with the annual delta-V. longitude of the spacecraft, which The variation of the accumulated delta... the accumulated delta-V. that has to be compensated. The maximum delta-V for.... The oscillation of the annual delta-V for NSM has an important... oscillating annual delta-V for NSM and the total accumulated delta-V plotted over.... The curve of the annual delta-V has its shape due to... the accumulated delta-V. It illustrates the oscillation of the accumulated delta-V due to the inconstant annual delta-V. Accumulated delta-V, m/s Downloaded by... within certain limits, whereas the delta-V is determined by the longitude... thruster activity. The real performed delta-V (ΔvSKM) determined by the use... the SKM direction5 and the delta-V type5, can be calculated from... Unsteady annual delta-V for NSM Number of high delta -V and low delta-V NSM... period and the annual delta-V and total delta-V. The variations of the... number of low and high delta-V SKM per year. One effect... 12/04/2020 NSM - low delta-V 2.10 0.09 1198.23 217... 12/25/2020 NSM - high delta-V 3.90 1196.44 215.29... 01/22/2021 NSM - high delta-V 3.90 1194.61 213.46... 12/02/2021 NSM - low delta-V 2.10 1193.60 212.45... can be *) **) calculated if the delta-V, EOL 100 necessary for re... satellite mass (Δms/c,inbound) ,the delta-V (ΔvSKM) and the effective Isp... satellite mission at GSOC, the delta-V for each iteration step is... on the SKM-direction and delta-V type. The only difference between... PEP uses for EWM a constant delta-V. Its impact on the validity... Eq. (2) from Date of SKM delta-V type data stated in the... on the SKM direction and delta-V type. The effective Isp is... of Annual Delta-V for NSM The magnitude of the delta-V for each... to fulfill the unsteady annual delta-V (cf. III.A.1). The satellites that... (high delta-V and low delta-V) still allows complying with the annual delta-V. Hence, the adaption to the annual delta-V happens with the quantity of the two different delta-V types... low delta-V NSM (nNSM low delta-V) and the number of high delta-V NSM (nNSM high delta-V) may... adaption of high and low delta-V NSM has to be done... computation process. If the high delta-V NSM are scheduled in real... the Table 3. Annual delta-V, number of high delta-V SKM and cycles per... 12 13 14 15 Annual delta-V, m/s 42.63 46.38 47... 17 18 Number of high delta-V SKM 2 4 3 1 0 0 0 1 0 2 3 2 4 4 4 9 American Institute of Aeronautics... schedule is available the high delta-V NSM are equally distributed over... the variation of the high delta-V NSM, the corresponding propellant consumption... delta-V types is listed in Table 3. (9) nSKM cycles = nNSM = nNSM low delta-V + nNSM high delta-V The iterative mass computation.... The first parameter is the delta-V accumulated over all iteration steps. The second parameter is the delta-V accumulated per year which is... annual delta-V can indicate if the numbers of high delta-V and low delta-V NSM were chosen correctly for the PEP. The accumulated total delta... of dates of the high delta-V NSM and due to the... data, the number of high delta-V NSM is in accordance, just... though a shift of different high delta-V NSM is apparent, both curves... as soon as the high delta-V NSM are scheduled equally for... the time shift of high delta-V NSM. Figure 11 shows the... time shift of the high delta-V NSM dates. The development of.... 4). The variation of the annual delta-V for NSM leads to a slight...



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.......................................................................36 Example how to connect delta connected three-phase CT set.......................................................151 Zero sequence based...........................................................152 Delta U and delta I ...............................................................152 Dead line detection... accordingly. 4.2.2.6 Example how to connect delta connected three-phase CT set... an example how to connect a delta connected three-phase CT set... 1 2 4 3 IL1-IL2 CT 600/5 in Delta DAB Connected SMAI2 IL2-IL3... IEC11000027 V3 EN Figure 12: Delta DAB connected three-phase CT... three individual phase currents from a delta connected three-phase CT set... alternative is to have the delta connected CT set as shown... IL1 IED 1 4 2 3 CT 800/1 in Delta DAC Connected IL1-IL3 IL2... IEC11000028 V3 EN Figure 13: Delta DAC connected three-phase CT... IEC (ANSI) standard for open delta connected VTs d) is the equivalent... should be used the open delta must be connected here. 5) Preprocessing... the secondary windings of open delta VTs quite often have a secondary... V4 EN Figure 18: Open delta connected VT in high impedance... ratio of one individual open delta VT. 3 × 6.6 110 6.6 = EQUATION1925 V1 EN... secondary windings of such open delta VTs quite often has a secondary... ratio of one individual open delta VT. 138 115 138 = 3 115... transform zero sequence current. If a delta winding of a power transformer is... the earthing transformer on the delta side of the power transformer... harmonic currents cannot flow into a delta winding, the fifth harmonic is... special connection of main CTs (delta connected CTs). With numerical technology... the main CT connected in delta shall be intentionally set for..., often designed for such typical delta connections, set the ratio as... will be provided externally by delta connected main CT. All other... IL3 IL3 L2 CT in Delta DAB Connected en06000549.vsd IEC06000549... should be set FromObject. For delta DAC connected main CTs, secondary... sequence current component For DAC delta connected main CTs, ratio shall... 1MRK 504 158-UEN - For delta DAB connected main CTs, secondary... sequence current component For DAB delta connected main CT ratio shall.... Second solution will be with delta connected main CT on Y (that... all presented applications. Example 1: Star-delta connected power transformer without on... differential protection solutions for star-delta connected power transformer For this... clockwise direction. Thus the DAC delta CT connection must be used... solution make sure that HV delta connected CTs are DAC connected... CT) Selected value for solution 2 (delta connected CT) 300 300 3 = 173... (Equation 15) To compensate for delta connected CTs, see equation 15... CT) Selected value for solution 2 (delta connected CT) RatedVoltageW1 69 kV... A 965 A ConnectTypeW1 STAR (Y) STAR (Y) ConnectTypeW2 delta=d star=y 1) ClockNumberW2 1 [30 deg lag... protection function To compensate for delta connected CTs Zero-sequence current... by connecting main CTs in delta Transformer protection RET650 2.1 IEC Application... protection 1MRK 504 158-UEN - Delta-star connected power transformer without... Dyn1 (DABY) CT 1500/5 in Delta (DAB) en06000555.vsd IEC06000555 V1...: Two differential protection solutions for delta-star connected power transformer For... direction. Thus, the DAB CT delta connection (see figure 30) must... solution make sure that LV delta connected CTs are DAB connected... value for Solution 2 connected CT) (delta connected CT) CTprim 1500 1500... (Equation 16) To compensate for delta connected CTs, see equation 16...) Selected value for both Solution 2 (delta connected CT) RatedVoltageW1 115 kV... A 301 A RatedCurrentW2 1391 A 1391 A ConnectTypeW1 Delta (D) STAR (Y) 1) ConnectTypeW2 star=y star=y ClockNumberW2... Selected value for both Solution 2 (delta connected CT) LocationOLTC1 Not Used... conected CT) To compensate for delta connected CTs. Zero-sequence current... by connecting main CTs in delta. Summary and conclusions The IED... main CTs either star or delta connected. However the IED has... where the main CTs are delta connected. For such applications the... in mind: 1. 2. 3. The ratio for delta connected CTs shall be set... is provided by the external delta CT connection. The zero sequence... eliminated by the main CT delta connections. Thus on sides where CTs are connected in delta the zero sequence current elimination... the most commonly used star-delta vector groups around the world...-load voltage phasor diagram Required delta CT connection type on star... earthing transformer (in case of delta-connected windings). The low impedance... sum or an external open delta is used. Current polarizing is... avoided. A criterion based on delta current and delta voltage measurements can be... negative sequence, zero sequence and delta algorithm are in percent of... according to the setting GlobalBaseSel Delta U and delta I Set the operation mode selector OpDUDI to On if the delta... in the network. The delta current and delta voltage function shall always...



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... Delta UPS Solutions Uninterruptible Power Supply www.deltapowersolutions.com Introduction Delta Group Delta... products, and renewable energy solutions. Delta Group is focused on three... management, and smart green life. Delta Group has sales offices worldwide... a global leader in power electronics, Delta’s mission is, “To provide innovative...-efficient solutions for a better tomorrow.” Delta is committed to environmental protection... many years. More information about Delta Group can be found at... Contents Dalta Group 1 About MCIS 3 Delta UPS 4 Product 6 ● Amplon ● Ultron & Modulon... UPS Q&A 47 2 Introduction About MCIS Delta UPS With its expertise and... Infrastructure Solutions (MCIS) business of Delta Electronics Inc. positions itself as... Total Cost of Ownership (TCO). Delta MCIS is a powerful and trustworthy..., harmonic distortion and line noise. Delta Electronics emphasizes the areas of... experience in the UPS industry, Delta Electronics is a leading brand, commanding... Shenzhen, just to name a few. Delta’s UPS solutions play a critical role... companies in the world choose Delta because our products are designed... be achieved within a single rack. Delta UPS systems feature the following... competitiveness. Delta UPS - Amplon Family Agilon Family In the Delta UPS product... 1/2/3 kVA Amplon Family In the Delta UPS product line, the Amplon... availability. Ultron Family In the Delta UPS product line, the Ultron... without utility power. In the Delta UPS product line, the Modulon... efficiency and reliable UPS systems, Delta Electronics also offers the following... prevents battery from overdischarge. 6 Product Delta UPS - Amplon Family R Series, Single... prevents battery from overdischarge. 7 8 Product Delta UPS - Amplon Family RT Series... Asia (excluding India) 9 10 Product Delta UPS – Ultron Family H Series, Three... investment. 11 12 Product Delta UPS – Ultron Family Delta UPS – Modulon Family... 160/200kVA 20-120 kVA Delta’s Ultron DPS is a double-conversion... achieve the highest availability possible, Delta has enhanced special designs for... Modulon NH Plus series is Delta’s next generation UPS featuring high...-in transformer. 13 14 Product Delta UPS – Modulon Family NHV Plus... Modulon NHV Plus series is Delta’s next generation UPS featuring high... with Delta UPS standard software: UPSentry Smart 2000 USB: Delta HID Protocol... UPS Management Mini TVSS Card Delta UPS Management Software Functions and... Excellence Award for Corporate Leadership Delta’s Manufacturing System is Certified by... Interface Power cord (IEC320 C20) Delta’s Manufacturing System is Certified by... Excellence Award for Corporate Leadership Delta’s Manufacturing System is Certified by... Excellence Award for Corporate Leadership Delta’s Manufacturing System is Certified by... Excellence Award for Corporate Leadership Delta’s Manufacturing System is Certified by... Excellence Award for Corporate Leadership Delta’s Manufacturing System is Certified by... Excellence Award for Corporate Leadership Delta’s Manufacturing System is Certified by... Excellence Award for Corporate Leadership Delta’s Manufacturing System is Certified by... Excellence Award for Corporate Leadership Delta’s Manufacturing System is Certified by... Excellence Award for Corporate Leadership Delta’s Manufacturing System is Certified by... Excellence Award for Corporate Leadership Delta’s Manufacturing System is Certified by... to reconfiguration of the UPS; Delta provides the configuration service. ** When... Excellence Award for Corporate Leadership Delta’s Manufacturing System is Certified by... Excellence Award for Corporate Leadership Delta’s Manufacturing System is Certified by... Excellence Award for Corporate Leadership Delta’s Manufacturing System is Certified by... time. 52 Europe Czech Republic Delta Energy Systems (Czech Republic) spol... F +420 271 751 799 Finland Delta Energy Systems (Finland) Oy Juvan... 9 84966 0 F +358 9 84966 100 France Delta Energy Systems (France) S.A. ZI du... 1 64 97 05 77 Germany Delta Energy Systems (Switzerland) AG German... F +49 2921 987 396 Italy Delta Energy Systems (Italy) Socio unico... F +39 051 731 838 Poland Delta Energy Systems (Poland) Sp. z.o.o. 23... 22 335 26 01 Russia Delta Energy Systems (Russia) Vereyskaya Plaza... 644 32 41 Slovak Republic DELTA ELECTRONICS (SLOVAKIA), s.r.o. Botanická 25/A, SR... 1283 Brochure_UPS_en-us_V2 Americas Spain Delta Energy Systems (Spain) S.L. Calle Luis... 470 70 68 90 Switzerland Delta Energy Systems (Switzerland) AG Freiburgstrasse... 216 499 8070 United Kingdom Delta Electronics Europe Ltd. 1 Redwood Court... 889 Middle-East & Africa Senegal Delta Energy Systems Cite des Magistrats... 332 20 04 South Africa Delta Energy Systems MEA (Switzerland) AG... 667 0469 United Arab Emirates Delta Energy Systems AG (Dubai BR... 50 65 345 06 Argentina Delta Greentech Sarmiento 1889 5A Buenos Aires T +5411 4372 310 Brazil Delta Energy Systems (Brazil) S/A Rua Itapeva... 1 673 4927 Asia Pacific China Delta GreenTech (China) Co., Ltd. No... F +86 21 5863 0003 India Delta Power Solutions (India) Pvt. Ltd... F +91 124 4874 945 Taiwan Delta Electronics Inc. 39 Section 2, Huandong...



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DELTA-K WIDEBAND SAR INTERFEROMETRY FOR DEM GENERATION AND PERSISTENT SCATTERERS USING TERRASAR-X Ramon Brcic, Michael Eineder, Richard Bamler, Ulrich Steinbrecher, Daniel Schulze, Robert Metzig, Konstantinos Papathanassiou(1), Thomas Nagler, Florian Mueller(2), Martin Suess(3) (1) German Aerospace Center, DLR, Muenchnerstr. 20, 82234 Wessling, Germany, Email: {Ramon.Brcic, Michael.Eineder, Richard.Bamler, Ulrich.Steinbrecher, Daniel.Schulze, Robert.Metzig, Kostas.Papathanassiou}@dlr.de (2) ENVEO IT GmbH, ICT - Technologiepark, Technikerstrasse 21a, A-6020 Innsbruck, Austria, Email: {Thomas.Nagler, Florian.Mueller}@enveo.at (3) ESA, Keplerlaan 1, 2200 AG Noordwijk, Netherlands, Email: Martin.Suess@esa.int ABSTRACT Wideband SAR systems such as TerraSAR-X allow estimation of the absolute interferometric phase without resorting to error prone phase unwrapping. This is achieved through the delta-k technique that exploits frequency diversity within the range bandwidth to simulate a SAR system with a much longer carrier wavelength. This benefits all interferometric applications including DEM generation and land surface motion determination. Here we present the results of an ESA study (21318/07/NL/HE) into using delta-k absolute phase estimation for DEM generation and PSI (Persistent Scatterer Interferometry). Using TerraSARX data, examples from a delta-k DEM generation system are shown which avoid the errors induced by conventional phase unwrapping. For PSI, the possibilities of absolute phase estimation for a single PS are explored in theory and examples where wideband estimation is compared to conventional PSI processing for a stack of acquisitions over Paris. 1. INTRODUCTION Determining the number of integer phase cycles has been a problem since the first SAR interferograms were formed. For DEM (Digital Elevation Model) generation, this problem is solved by PU (Phase Unwrapping) [3] where the gradients between interferogram pixels are integrated to achieve phase differences larger than one cycle. For PSI (Persistent Scatterer Interferometry) [4][5], the absolute velocity and height difference between two points are determined by a time series analysis involving 2-dimensional frequency estimation. Both methods are prone to errors if the gradients are aliased, i.e. larger than the spatial or temporal sampling intervals allow for. All mentioned applications would enormously profit from a gradient independent means to estimate the absolute phase between pixels. We concentrate on the delta-k method [6] which uses frequency diversity within the range bandwidth to resolve for the unknown integer phase cycle. The optimal estimator determines the residual shift between the two SAR images by complex cross correlation and highly accurate peak determination with subpixel _____________________________________________________ Proc. ‘Fringe 2009 Workshop’, Frascati, Italy, 30 November – 4 December 2009 (ESA SP-677, March 2010) accuracy [1]. Delta-k estimates this shift in a computationally efficient sense by splitting the SAR images into subbands and determining the phasefrequency gradient between the subband interferograms. This simulates a SAR system with a much longer carrier wavelength than the actual one, increasing the HoA (Height of Ambiguity) to a point where PU is unnecessary. Other methods use multiple SAR images with different frequencies or geometries [7]–[12]. We show that for DEM generation, delta-k can be used as a standalone method or to support/validate PU. The trade-off in this case is that the large HoA afforded by delta-k is accompanied by reduced resolution. For PSI we investigate delta-k absolute phase estimation for a single PS from both a theoretical perspective and through experiments. In both cases delta-k provides independent estimates for either a patch in DEM generation or a single pixel in PSI and this eliminates the main disadvantage of conventional techniques – that a single PU error can propagate and affect large areas. 2. DELTA-K ABSOLUTE PHASE ESTIMATION The theory of delta-k absolute phase estimation and its practical application are detailed in [1][2][6] and only a brief summary is given here. For repeat-pass interferometry the relationship between interferometric phase, φ , and differential range, Δr, is φ = 4π fC Δr , c (1) where fC is the radar carrier frequency and c the speed of light. Taking the differential phase between two subband interferograms with range bandwidths b and range centre frequencies fC±f0, as illustrated in Figure 1, gives the delta-k phase, Δφ = φ2 − φ1 = 4π 2 f0 Δr . c (2) The delta-k phase can then be interpreted as the interferometric phase at a simulated carrier frequency 2f0<



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... – Consistent in-space elements, margins, delta-Vs, cost tools, masses, etc… • Examined launching on Falcon Heavy, Delta IV Heavy, international vehicles, and... mass • 5% flight performance reserve on delta-Vs • Dry Mass Growth Allowances... Missions With Depot/CPS, With Delta IV Heavy LV WWW.NASAWATCH....NASAWATCH.COM DRM 34B w/ 28MT Delta IV Heavy + Propellant Depot/CPS... WWW.NASAWATCH.COM NEA Mission Delta IV Heavy Launch Schedule 3 NEA... 11 10 TBD Commercial Crew 9 8 Delta IV (SEV) 7 < Earlier Science Precursor... Flights - not shown. Delta IV (MPCV) 6 5 Delta IV (DSH) 4 Delta IV (CPS) 3 Reserve propellant flights – not shown Delta IV (Propellant) 2 Delta IV....COM 2028 2029 2030 Other Delta IV Business (Historical) www.nasa... Space Administration WWW.NASAWATCH.COM Delta IV Heavy Based NEA Mission... REC. Exploration Elements Launcher(s) REC. Delta IV Heavy-PSV NREC. Propellant Depot Replace@End Life Delta IV Heavy-PSV REC. CPS....NASAWATCH.COM NEA Mission Observations – Delta IV Heavy LV • Costs $10s... actual availability of NEA 2008EV5 • Delta IV Heavy launch capacity could... of large CPS stage with Delta IV adds some complexity, but... Missions With Depot/CPS, With Delta IV Heavy LV WWW.NASAWATCH....NASAWATCH.COM DRM 33C w/ 28MT Delta IV Heavy + Propellant Depot/CPS... WWW.NASAWATCH.COM Lunar Mission Delta IV Heavy Launch Schedule 4 Lunar... 11 10 9 TBD Commercial Crew 8 Delta IV (MPCV) 7 < Earlier Science Precursor... shown 2 Delta IV (Lunar Lander) 5 Delta IV (CPS) 4 3 Delta IV (Propellant) Delta IV (Depot....COM 2028 2029 2030 Other Delta IV Business (Historical) www.nasa... Space Administration WWW.NASAWATCH.COM Delta IV Heavy Based Lunar Mission... REC. Exploration Elements Launcher(s) REC. Delta IV Heavy-PSV NREC. Propellant Depot Replace@End Life Delta IV Heavy-PSV REC. CPS....NASAWATCH.COM Lunar Mission Observations – Delta IV Heavy LV • Costs $10s... earlier than HLLV-based approaches • Delta IV Heavy launch capacity could... with Delta IV Heavy easier • Integration of lunar lander on Delta IV... Fleet of Falcon Heavy and Delta IV Heavy LVs WWW.NASAWATCH... WWW.NASAWATCH.COM NEA Mission Delta IV & Falcon Heavy Mixed Fleet... with NEA single provider scenarios. • Delta IV w. shifts/staff & improvements gets... Scenario 11 10 9 8 7 6 5 4 3 2 1 0 Delta IV (Propellant) Other Delta IV Business (Historical) 2020... Space Administration WWW.NASAWATCH.COM Delta IV & Falcon Heavy Mixed Fleet...(s) NREC. Falcon Heavy-PSV NREC. Delta IV Heavy-PSV REC. CPS... NREC. Exploration Elements Launcher(s) REC. Delta IV Heavy-PSV NREC. Propellant...,000 CPS Delta 4 Heavy 28mt $30,000 Tanker on Delta 4 Heavy Falcon... 9 Heavy 53 mt Delta 4 Heavy 28 mt Falcon 9 + Delta 4 Mixed Fleet F9H... 53mt $10,000 Tanker on Delta 4 Heavy Delta 4 Heavy 28mt Kick Stage... $0 Falcon 9 Heavy Delta 4 Heavy 53 mt 28 mt Falcon 9 + Delta 4 Mixed Fleet... 2011, $M SEP Delta 4 Heavy 28mt $40,000 Tanker in Delta 4 Heavy Falcon... 9 Heavy 53 mt Delta 4 Heavy 28 mt Falcon 9 + Delta 4 Mixed Fleet F9H...,000 SEP Tanker in Delta 4 Heavy $8,000 Delta 4 Heavy 28mt Tanker in... 9 Heavy 53 mt Delta 4 Heavy 28 mt Falcon 9 + Delta 4 Mixed Fleet F9H... Falcon Heavy • Dia = 1.67 X 3.6 m = 6.0 m – ULA Delta IV/Atlas 5 Phase 2 • Dia = 1.67... at NASA HQ, 10/2010). – Delta IV: 2-5/year. Could be doubled... pushed through thousands of m/s of delta-V can be reduced All of...



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... wetland ecosystems in Ganges-Brahmaputra delta in Bangladesh Shafi Noor ISLAM... in the Ganges-Brahmaputra delta in Bangladesh. The delta is undergoing rapid... management plan in the Ganges delta of Bangladesh. Keywords freshwater discharge... 1 Introduction The Ganges delta is the largest delta and occupies the lower... Asian region of Bengal. The delta has come into existence by... of the region. The Ganges delta is situated just above the... portion occupied by Bangladesh. The delta is about 360 km wide.... The river courses in the delta are broad and active, carrying large amounts of water. This delta is a tract of vast alluvial... roughly resembling the Greek letter ‘D’ (Delta) and commences at the offtake... Bengal, India (Rob, 1998). The delta of the Ganges covers a total... rivers annually, the Ganges delta is a growing delta. The temperature is 9.3u... deposits occupying the great Bengal delta plane woven with numerous small... rivers (Islam, 2006). The Ganges delta is the site of the.... It is the world’s largest delta being the most fertile and... is also called the Green delta which is also a nick name.... The Ganges delta is also called the Ganges -Brahmaputra River Delta (Islam... Sundarbans, situated in the Ganges delta, consists of an area of... and ecology of the Ganges delta of Bangladesh portion depends on... mangrove ecosystems in the Ganges delta. Fig. 1 2 Objectives The objectives of... wetlands ecosystems in the Ganges delta and how it is being... the Bengal Basin and Ganges delta are floored with Quaternary sediments... location of the Ganges-Brahmaputra delta is at latitude of 24u409.... The longitudinal extension of the delta is from 88u E to 91u509... 90u19 E (Katebi, 2001). The Ganges delta and the Sundarbans location the... wetland ecosystems in Ganges-Brahmaputra delta in Bangladesh 441 Fig. 2 (a) The... of the Ganges-Brahmaputra delta 4 The Ganges delta and the mangrove wetlands The development of the Ganges-Brahmaputra delta... relief, the gradient of the delta surface is about 0.016 m/km.... The average elevation of the delta in Khulna, Barisal, the Southern... 2 m. The river courses in the delta are carrying water discharge, 29... delta and location of wetlands tons per day. The Ganges Brahmaputra Delta can be divided into four major categories: i) Moribund delta, ii) Mature delta and iii) Active delta and iv) Tidally active delta (Fig. 2(a)). i) The moribund delta... district. The area of moribund delta covers an area of about.... The rivers of the moribund delta cannot bring down enough water... area. ii) The mature delta: The mature delta covers an area of... wetland ecosystems in Ganges-Brahmaputra delta in Bangladesh Fig. 3 443 Three.... iii) The active delta: The eastern active delta covers an area of.... This part of the GangesBrahmaputra delta is about 300 km long.... The eastern active Ganges-Brahmaputra delta includes Rajbari, Faridpur, Shariatpur, and... tidally active delta: The southwestern part of the Ganges delta is coastal area and a tidally active delta. It is dominated by coastal tidal currents. The tidally active delta... 13500 km2. The Tidally active delta includes the southern part of... wetland ecosystems in Ganges-Brahmaputra delta in Bangladesh Fig. 5 445 Water... wetland ecosystems in Ganges-Brahmaputra delta in Bangladesh part of Bangladesh.... 2(b)) are situated in the Ganges delta. The Ganges fresh water plays... and its ecosystems in the delta. Considering the increasing salinity trends... freshwater supply in the Ganges delta in Bangladesh is necessary for... Sundarbans region in the Ganges Delta in Bangladesh. Acknowlegements The authors... by APN Mega Delta Project. We acknowledge APN Mega Delta Project and.... Zhongyuan Chen of APN Mega Delta Project Leader and Professor of... 448 Bagchi K G (1944). The Ganges Delta. Calcutta: Calcutta University Press, 1–25... the coastal region of Ganges Delta. Oriental Geographer, 41(2), 1997. Dhaka...