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21.
The use of scrap-tire-shreds as leachate collection layer in landfills would reduce the magnitude of the current tire disposal
problem by converting a waste into a beneficial material. Laboratory studies were conducted to investigate scrap-tire-shreds
as an attractive potential alternative to conventional gravel in the drainage layer of leachate collection system by comparative
analysis of various physico-chemical parameters. Gravel and scrap-tire-shreds in combination were used as leachate collection
layer. Laboratory Test Cells consisting of different combinations of scrap-tire-shreds (size range length = 25.4 mm to 76.1 mm
and width = 5 mm) and gravel (size range 10 mm to 20 mm) beds as leachate collection layer with total bed thickness of 500 mm
were constructed. Performance study of Test Cells- 1 to 7, having different combinations of scrap-tire-shreds and gravel bed
thickness, were studied to work out the best combination. Combined beds of scrap-tire-shreds and gravel gave better results
as compared to conventional gravel or scrap- tire- shreds bed when used singly. Test Cell -3 having scrap-tire-shreds layer
(200 mm) and gravel layer (300 mm) gave the best results in terms of percentage reduction in various physico-chemical parameters
of leachate. The reduction was as high as 68.8 and 79.6% in case of Biological Oxygen Demand (BOD) and Chemical Oxygen Demand
(COD) values respectively. Further, three more laboratory Test Cells-8, 9 and 10 were constructed having scrap-tire-shreds
and gravel layer ratio same as that of Test Cell- 3 (best combination) but having scrap-tire-shreds of different widths 10 mm,
15 mm and 20 mm to find out the most suitable size. Bed of smaller size scrap-tire-shreds (5 mm) gave better results in comparison
to bigger sizes. Leachate sample after passing through combined beds of scrap-tire-shreds and gravel gave better results in
percentage reduction in various physico-chemical parameters of leachate as compared to conventional gravel or scrap-tire-shreds
bed when used singly. 相似文献
22.
Ajay Dashora B. Sreenivas Bharat Lohani Javed N. Malik Afroz Ahmad Shah 《Journal of the Indian Society of Remote Sensing》2006,34(2):153-160
Use of high-resolution and historic CORONA satellite photographs for mapping and other purposes requires Ground Control Points
(GCPs), as ephemeris data and image parameters are not available. However, the alterations in landscape in last 34 years (i.e., since the acquisition of these photographs) prevent identification and collection of large number of GCPs in the field.
This paper presents a methodology for collection of GCPs for CORONA photographs. The advantages and limitations of the methodology
are discussed. For a study site, situated in Siwaliks and Lower Himalayas, the GCPs were identified in CORONA photographs
and their WGS84 coordinates were estimated through a process of datum transformation and georeferencing. Estimated GCP coordinates
from the topo sheets and 2D and 3D views of photographs, helped in identifying the GCP locations in field, which were observed
using DGPS. Investigations were carried out to relate Differential Global Positioning System (DGPS) accuracy with base line
length and time of observation. Abase line of 350 km and half an hour observation were found appropriate to yield accuracy
in GCP collection by DGPS method, which conforms to CORONA resolution of 3 m. 相似文献
23.
Ajay Mathur P K Litoria P K Sharma M H Kalubarme 《Journal of the Indian Society of Remote Sensing》1998,26(4):209-214
The present study attempts to conceptualise an approach to integrate the remotely sensed and spatial?n-spatial data generated over the years under Crop Acreage and Production Estimation (CAPE) project through GIS for their easy retrieval and comparison; and to develop a program in dBASE to calculate crop acreage using non-spatial attributes imported from GIS. The “Crop Information System” thus developed would help the planners in analysis/comparison of the database related to crops over the years. 相似文献
24.
Land use changes from natural ecosystems to industrial agriculture have impacted water quality and wildlife populations in the Mississippi River basin. Government programs providing technical assistance and monetary incentives have not resulted in adequate adoption rates of conservation practices. While there has been a plethora of research examining the factors associated with conservation adoption, significantly less is understood about the relative importance of these factors. Using the Analytic Hierarchy Process (AHP) with agricultural producers in three Midwestern watersheds, we assess the relative importance of environmental and production decision criteria when making decisions to adopt conservation practices. Although AHP provides insight into how decisions may be made at the watershed scale, this methodology also provides insight into how individuals make conservation decisions and may also provide a method for delivering tailored conservation advice and communications. 相似文献
25.
26.
Natural Hazards - The recurring flooding causes loss of life and damage to buildings and other structures, including bridges, sewerage systems, roadways and canals. It also frequently damages power... 相似文献
27.
K. Jeeva C. Panneerselvam K. U. Nair C. Selvaraj Ajay Dhar B. M. Pathan S. Gurubaran 《Journal of the Geological Society of India》2011,78(3):199-210
The global component of fairweather electricity is subject to special attention to watch the solar-terrestrial effects and
secular changes in climate. It is generally considered that the diurnal variation of atmospheric electricity parameters, if
they are not following the Carnegie pattern, are not representative of the global thunderstorm activity. Some of the results
obtained from Maitri (70°45′54″S, 11°44′03″), are discussed here in context with global thunderstorm activity and space weather
influences. The diurnal pattern of the Potential Gradient and current density strongly deviate from the Carnegie curve. We
have showed that this deviation is not due to the local electrical influence but due to the global thunderstorm activity.
During fairweather condition the parameters are representing the global thunderstorm activity and to some extent they respond
to the upper atmospheric electro dynamic phenomenon. The mean value of the potential gradient (77.7 V/m) and current density
(2.13 pA/m2) well below the expected global mean but close to the value reported from the same location and season in the past years.
The mean conductivity, 3.34 × 10−14 mhom−1, is slightly at higher side and they exhibit a different diurnal trend comparing to the past measurements at this location. 相似文献
28.
Raghavendra Ajay Zhou Liming Roundy Paul E. Jiang Yan Milrad Shawn M. Hua Wenjian Xia Geng 《Climate Dynamics》2020,54(5):2683-2695
Climate Dynamics - A significant declining trend in rainfall over the Congo basin has been observed over the past three decades. Since the Madden–Julian oscillation (MJO) is a major forcing... 相似文献
29.
Li Lei Tan Jingqiang Zhang Dazhou Malkoti Ajay Abakumov Ivan Xie Yujiang 《Computational Geosciences》2021,25(5):1565-1578
Seismic modeling plays an important role in geophysics and seismology for estimating the response of seismic sources in a given medium. In this work, we present a MATLAB-based package, FDwave3D, for synthetic wavefield and seismogram modeling in 3D anisotropic media. The seismic simulation is carried out using the finite-difference method over the staggered grid, and it is applicable to both active and passive surveys. The code package allows the incorporation of arbitrary source mechanisms and offers spatial derivative operators of accuracy up to tenth-order along with different types of boundary conditions. First, the methodological aspects of finite-difference method are briefly introduced. Then, the code has been tested and verified against the analytical solutions obtained for the homogeneous model. Further, the numerical examples of layered and overthrust models are presented to demonstrate its reliability.
相似文献30.
Amanjeet Panghal Ajay Kumar Suneel Kumar Joga Singh Parminder Singh B. S. Bajwa 《Journal of the Geological Society of India》2018,91(6):695-699
A fossil wood of Lagerstroemia L. from the Upper Siwalik sediments of Arunachal Pradesh is described. The genus is recorded for the first time from this state. The modern analog of the fossil species i.e. L. tomentosa C. Presl is not found in the fossil locality at present.. The most plausible reason for the disappearance of the species from the fossil locality is an increase in temperature seasonality caused by the upheaval of the Himalaya during the Pleistocene. 相似文献