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11.
Increasing salinity is one of the most significant and widespread forms of groundwater pollution in coastal areas. This paper
presents the causes and impacts of saline water intrusion in coastal areas. Various causes of salt water intrusion, and approaches
for the determination of its extent and various measures to control the salt water intrusion are described. An aquifer performance
test (APT) approach is presented to identify the extent of existing salt water intrusion in the study area located in the
southwest coastal region of Gujarat State (India). A resistivity based experimental technique is used to identify the quality
of the groundwater available at different depths. A methodology is presented to assess the extent of available fresh and saline
groundwater and to find out the limit up to which lower saline groundwater can be withdrawn for industrial purposes without
affecting the upper fresh water layer which can be made available for domestic purposes. 相似文献
12.
Gopal Kaliyaperumal Mukilarasan Nedunchezhiyan Poyyamozhi Natesan Melvin Victor De Poures Sivanantham Arunachalam Venkatesh Rathinavelu Naveen Subbaiyan 《环境质量管理》2023,33(1):165-171
Insists of polymer matrix composite is prepared by using natural fiber facilitates high tensile, flexural, and impact toughness properties. The natural fiber utilization in the polymer matrix can overcome the synthetic fiber demerits of poor compatibility, high moisture absorption, and high cost. The present research investigates developing a low-cost, environmentally eco-friendly epoxy hybrid composite using different volume percentages of chopped natural waste banana (0Vol%, 5Vol%, 10Vol%, and 15Vol%) and sisal fiber (0Vol%, 15Vol%, 10Vol%, and 5Vol%) through hand mould hot compression technique. The presence of natural waste banana and sisal fiber on tensile strength, flexural strength, and thermal adsorption properties of the epoxy hybrid composite are evaluated by ASTM test standards. The ASTM standard measured test results of epoxy hybrid composite with and without natural waste banana and sisal fiber were compared and sample three was identified by good tensile strength, flexural strength, and better thermal adsorption properties compared to all others. The sample three epoxy hybrid sample is recommended for automotive roof application. 相似文献
13.
Naveenprabhu Venkateswaran Naveen Subbaiyan Gopirajan Punniyakotti Varadharajan Suresh Vellingiri Abdul Rab Asary Jitendra Mohan Giri Pitchandi Petchimuthu 《环境质量管理》2023,33(1):293-301
The condenser is a piece of equipment used to effectively transfer heat from water to the environment. The fin and tube condenser is the most commonly used in commercial applications. The improved performance of heat transfer in the fin and tube condenser is a significant area of study all over the world because optimizing the efficiency of heat transfer in the condenser will contribute to enhancing the effectiveness of system performance. The vapor deposition, plasma spray, and thermal spray techniques are being used, and it is determined that a heat transfer enhancing coating improves condenser performance. This review discusses the nanomaterial coating over the fin and tube condenser in detail. The various nanomaterial coatings with various propositions and coating methods had been discussed with the evidence of previous researchers. At a 50-degree inclination angle on the condensate plate, the condensate over the coating surface increases by more than 30%. The thermal properties of the working fluid are improved over the condenser, and the overall effectiveness of the condenser is increased by approximately 40% over the non-coated condenser. A 1% volumetric concentration of Nanoparticles in the coated material achieves a maximum efficiency increase of 78.7%. 相似文献
14.
Sonthalia Ankit Kumar Naveen 《Environmental science and pollution research international》2021,28(10):11824-11834
Environmental Science and Pollution Research - Compression ignition engines powered by diesel are the work horses of developing countries like India. However, burning fossil fuel causes a lot of... 相似文献
15.
Sonthalia Ankit Garg Shivam Sharma Rishav Subramanian Thiyagarajan Kumar Naveen 《Environmental science and pollution research international》2021,28(10):11850-11859
Environmental Science and Pollution Research - The exhaust emissions from the compression ignition engines are harmful to both human beings and the environment. After-treatment devices placed in... 相似文献
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17.
A sharp decline in the water level in Jaipur city and its hinterland region in NW India has been observed during the last
decades. Such a drop can be correlated with a widening gap between groundwater draft and recharge resulting from poor and
erratic rainfall and over-exploitation of groundwater resources. The city has undergone uncontrolled urban expansion complete
with a multifold rise in the population, which now stands at more than 3.3 million. Drying up of the surface water bodies
has further led to a total dependence on groundwater resources to meet the rising domestic and industrial demand for water.
There are about 1,000 bore wells drilled by Governmental agencies and an estimated 11,000 privately owned ones. The water
is generally alkaline carbonate–bicarbonate type. We evaluated water quality for the period between 1993 and 2001 and observed
notable deterioration that we attribute to inadequate recharge and a change in the potential water-bearing zones from alluvium
to granite–gneiss bedrocks, caused by a drop in the water table. In addition, we also attribute the problem of high nitrate
in groundwater in densely populated parts of Jaipur city to improper sewage disposal. 相似文献
18.
Rabee Elhdad Naveen Chilamkurti Torab Torabi 《Journal of Loss Prevention in the Process Industries》2013,26(1):104-116
In production plants, monitoring and maintaining industrial processes and emergency shutdowns are not straightforward tasks due to the large number of events and alarms which are triggered during the plant shutdown process. It is also vitally important to provide decision support to stakeholders for efficient and effective monitoring and maintenance of production process. This paper presents a novel framework and design to enhance maintenance decisions based on the knowledge gathered through the process of monitoring. This monitoring process is based on signals which are triggered during the plant safety shutdown process. We have designed and implemented a framework using an ontology and business rules to define the logical structure and operation of the petroleum plant with the objective of monitoring the cause and effect of the petroleum plant shutdown process. To enhance maintenance decisions, we have extended the ontology and the framework to ensure that decision makers have sufficient information to make the right decision at the right time. The proposed extended framework is designed, implemented and evaluated using an example petroleum production plant as a case study. 相似文献
19.
Ebrayi KN Pathak H Kalra N Bhatia A Jain N 《Environmental monitoring and assessment》2007,131(1-3):451-465
Nitrogen is the most widely used fertilizer nutrient, and it is a universally deficient nutrient too, which often severely
restricts the growth and yield of crops. To improve N fertilizer management, soil–plant system models can be applied to simulate
adequate N supply for both, optimal crop growth and minimal N losses. The likely impact of climate change on the cereal production
is of paramount importance in the planning strategies to meet the future growing needs on sustainable grounds. In this scenario
models are the effective tools to foresee the probable impacts and for choosing appropriate land use options. The study reported
in this thesis, employs field experiments and use of simulation tools to understand the dynamics of soil N balance and relate
growth and yield of rice under varying nitrogen inputs. The InfoCrop model was used in this study, which was calibrated with
the historic data sets, and subsequently validated with the field experiment conducted at IARI Farm, New Delhi. Simulated
results matched well with the observed values in terms of growth and yield of rice and seasonal nitrogen uptake. The components
of soil nitrogen balance differed among varying nitrogen level treatments, which was also captured by use of InfoCrop. The
model was then taken to climate change impact analysis. The results clearly revealed that when temperature increased, the
soil N losses, like denitrification, volatilization, N2O emission increased, whereas grain and biomass yields decreased. The
further scope of the study is to validate the study in contrasting agroenvironments. 相似文献
20.
As important marine mesopredators and sensitive indicators of Antarctic ecosystem change, penguins have been a major focus of long-term biological research in the Antarctic. However, the vast majority of such studies have been constrained by logistics and relate mostly to the temporal dynamics of individual breeding populations from which regional trends have been inferred, often without regard for the complex spatial heterogeneity of population processes and the underlying environmental conditions. Integrating diverse census data from 70 breeding sites across 31 years in a robust, hierarchical analysis, we find that trends from intensely studied populations may poorly reflect regional dynamics and confuse interpretation of environmental drivers. Results from integrated analyses confirm that Pygoscelis adeliae (Adélie Penguins) are decreasing at almost all locations on the Antarctic Peninsula. Results also resolve previously contradictory studies and unambiguously establish that P. antarctica (Chinstrap Penguins), thought to benefit from decreasing sea ice, are instead declining regionally. In contrast, another open-water species, P. papua (Gentoo Penguin), is increasing in abundance and expanding southward. These disparate population trends accord with recent mechanistic hypotheses of biological change in the Southern Ocean and highlight limitations of the influential but oversimplified "sea ice" hypothesis. Aggregating population data at the regional scale also allows us to quantify rates of regional population change in a way not previously possible. 相似文献