Migration of female construction labourers to Dhaka City,Bangladesh     

Ahsan RM 《International journal of population geography : IJPG》1997,3(1):49-61

The author analyzes migration patterns and processes of female construction workers in Dhaka City, Bangladesh, and considers the impact of this migration. "Interviews...reveal that the major goal of these female migrants, whose mobility and employment have traditionally been restricted, is to take responsibility in the struggle for livelihood.... Success of many migrations is linked with participation in construction work in the city. Employment in such activities is largely by women from male-headed households, indicating male support in the work, followed by females heading their own households."  相似文献   

Seasonal and Interannual Sea Surface Temperature Variability in the Coastal Cities of Arabian Sea and Bay of Bengal     

Tariq Masood Ali Khan  Dewan Abdul Quadir  Tad S. Murty  Majajul Alam Sarker 《Natural Hazards》2004,31(2):549-560

The sea surface temperature (SST) variations play a veryimportant role in the genesis and maintenance of meteorological and oceanographic processessuch as monsoon depressions and subsequent floods, large-scale sea level fluctuationsand genesis of tropical cyclones. Many low lying coastal regions of South Asia are adjacentto river deltas and have large population. The dense population, poor economy and severalother socio-economic factors make these areas most vulnerable to the impact of climate change.Variability of sea surface temperature (SST) is importantas the duration and intensity of SST provide the basis for studies related to climatic changescenario. In this study an attempt has been made to estimate the recent SST trends in the coastalwaters of some cities, which lie on the Arabian Sea and Bay of Bengal. The annual andinterannual variability has also been studied. The SST variations have then been linkedwith the El Nino and La Nina events.The NOAA-NASA Pathfinder Advanced Very High Resolution Radiometer (AVHRR) SST fields from 1985-1998, created in the Jet Propulsion Laboratory(JPL), USA are used in this study. Here the quality of data is an important factor toobtain reliable estimates of Sea Surface Temperature (SST) trends and other related parameters.However, this is not possible with the conventional type data, due to low quality as wellas sparse data in the region. Though the satellite based SST climatologies have shorterobservation lengths, they can provide reliable estimates of recent SST variability overa large oceanic areas with sparse or no data.Increasing trend of SST is observed throughout all theseasons in the northern Arabian Sea extending from Oman to Karachi and Mumbai and furthersouth to Salalah and Colombo. However, in coastal islands stations further south ofIndia such as at Colombo the increment is not significant. Though the increasing trend in SSTduring winter is not significant, nevertheless it shows the increasing influence of coldspells on this Island. An interesting situation has been observed in the Bay of Bengal. On anaverage, increasing trends in the annual SST were observed in Visakhaputnam. But at thestations located in the northeastern part of Bay of Bengal, namely Hiron Point and Cox'sBazar reverse conditions are observed. In the Southern Bay of Bengal variations in SST isnot significant which reflects in the SST analysis of Chennai and Port Blair stations. Locationof these stations at lower latitudes (near by equator) probably is the reason for this insignificantchange. It has been found that the interannual mode of SST variations dominate the linear SSTtrends which is characterized by the El Nino Southern Oscillations (ENSO) scale cycle.  相似文献   

Application of Nonparametric Statistical Tests in Hydrogeology   总被引：1，自引：0，他引：1  

S. H. Siddiqui  R. R. Parizek 《Ground water》1972,10(2):26-30

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India at crossroads for energy     

Mu Ramkumar  M.Santosh  Manoj J.Mathew  Numair A.Siddiqui 《地学前缘(英文版)》2021,12(6):356-360

As one of the fastest growing economies and further larger consumer of energy in the world,there has been a paradigm shift in India's energy demand.Here we evaluate the growth of Indian economy its,diversification of agriculture-based economy to industrial production,service and digital-technology based economy and deepening of income sources,although the dependence on foreign sources for energy demands has not markedly improved.This situation has placed India at the crossroads for energy sufficiency,especially under the highly fluid and changing geopolitical,strategic,environmental and economic scenarios of the World order.We attempt to un-derstand the issue from geological perspective and address some of the impediments.  相似文献   

Generic hierarchy of sandstone facies quality and static connectivity: an example from the Middle-Late Miocene Miri Formation,Sarawak Basin,Borneo     

Numair A. Siddiqui  Abdul Hadi A. Rahman  Chow W. Sum  Manoj J. Mathew  Muhammad Hassaan  David Menier 《Arabian Journal of Geosciences》2017,10(11):237

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DEM-based drainage network analysis using steepness and Hack SL indices to identify areas of differential uplift in Emilia–Romagna Apennines,northern Italy     

Saima Siddiqui  Doriano Castaldini  Mauro Soldati 《Arabian Journal of Geosciences》2017,10(1):3

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Late Quaternary tectono-geomorphological investigations of Zanskar Basin,NW Himalaya,India, using geospatial techniques     

Mohammad Irfan  Bikram Singh Bali  Ahsan Afzal 《地球表面变化过程与地形》2024,49(2):684-705

Geospatial techniques play a crucial role in geomorphic studies, particularly in the challenging terrains like mountainous regions, inaccessible areas and densely vegetated landscapes, where geomorphic features cannot be recorded easily. Tectono-geomorphologic observations provide important clues regarding the landscape evolution, morpho-dynamics and ongoing tectonism of the region. The present study has been carried out in the Zanskar Basin (ZB), located to the south of the Indus Tsangpo Suture Zone (ITSZ), in the hinterland of the NW Himalaya. This study has been carried out to assess and evaluate active tectonics by employing tectono-geomorphic analysis, dynamics in drainage networks, geomorphological field observations and the Geographic Information System (GIS) environment. High-resolution satellite images, topographic maps and the Shuttle Radar Topography Mission (SRTM) Digital Elevation Model (DEM) were used to generate primary data sets, which were corroborated with field investigations for valid inferences. The geometry of the ZB suggests that continuous tectonic activity exerts first-order control on the overall shape, size and structure of the ZB. This first-order response is clearly reflected in the landforms modified by tectonic processes, namely, linear mountain fronts, elongated shape and tilting of the basin, braided and meandering river courses and lower stream length gradient index values in hard rock terrain. The ZB exhibits several eye-catching geomorphic features, such as well-defined triangular facets with wide base lengths and wine-glass valleys with small outlets along the footwall block of the Zanskar Shear Zone/South Tibetan Detachment System (ZSZ/STDS), as well as the presence of wind gaps, water gaps, bedrock incision, incised and entrenched valleys, narrow gorges and a high incision rate inferring active tectonics and recent uplift in the region. In addition, the existence of uplifted river terraces, as well as the stepped morphology of fans and strath terraces, suggests that the region is experiencing recent activity and ongoing tectonic uplift. These modified geomorphic characteristics suggest that the hinterland, which is part of the NW Himalaya, is tectonically quite active and has experienced a differential rate of tectonics during its evolution. The quantified geomorphic indices and their relations with the tectonics, climate and erosion activity infer that the basin geometry is mostly controlled by the ZSZ/STDS that dips 20°–70° NE, the south-dipping Zanskar Counter Thrust (ZCT) and other local tectonic elements like the Choksti Thrust (CT), Stondgey Thrust, Zangla Thrust and tectonic structures. The synergised results of quantified geomorphic indices and tectono-geomorphic evidence in the ZB strongly indicate that both the past and ongoing tectonism have significantly shaped and modified geomorphology of the ZB.  相似文献   

Chelonodontops bengalensis (Tetraodontiformes: Tetraodontidae): A New Species of Puffer Fish from the Northern Bay of Bengal Based on Morphology and DNA Barcode     

Habib  Kazi Ahsan  Neogi  Amit Kumer  Oh  Jina  Lee  Youn-Ho  Kim  Choong-Gon 《Ocean Science Journal》2019,54(1):79-86

Ocean Science Journal - The new puffer fish species Chelonodontops bengalensis (Pisces: Tetraodontidae) is described from two specimens collected on the southwest coast of the Bay of Bengal,...  相似文献   

Assessment of Estimated Bedrock and Stream Sediment Geochemical Backgrounds in Catchment Basin Analysis     

Shahrestani  Shahed  Mokhtari  Ahmad Reza  Alipour-Asll  Masood 《Natural Resources Research》2019,28(3):1071-1087

Natural Resources Research - The weighted mean and the multiple regression techniques are two methods that are employed to estimate elemental background concentration of lithologies upstream of...  相似文献   

Nonlinear kinetic Alfven waves in space plasmas with generalized ($$) distribution     

Saba Khalid  M. N. S. Qureshi  W. Masood 《Astrophysics and Space Science》2018,363(10):216

In this paper, we have investigated linear and nonlinear propagation of kinetic Alfven waves in which the electrons have been assumed to follow generalized (\(r,q\)) distribution. We have shown that (\(r,q\)) distribution gives us most of the distributions observed in space plasmas. We have varied the flatness parameter \(r\) and the tail parameter \(q\) to explore the linear and nonlinear propagation characteristics of kinetic Alfven waves. We have also discussed the limiting cases. It has been shown that our results agree well with Fast and Freja observations of the nonlinear kinetic Alfven waves. An important feature of our study is the formation of rarefactive solitary structures. It has been shown that this result cannot be obtained with Maxwellian distribution and that it agrees well with the observations of Fast and Freja satellites.  相似文献