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Search Results: 1 - 10 of 1374 matches for " Richa Tiwari "
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An Approach to Human Adaptability towards its Built Environment: A Review  [PDF]
Richa Tiwari, Mukesh Pandey, Anupama Sharma
Energy and Power Engineering (EPE) , 2010, DOI: 10.4236/epe.2010.22013
Abstract: This paper deals with the human adaptability to its built environment. The built environment as we know it rarely finds itself adapting to its surrounding context, whether it be on the level of interaction with humans or the climate. Humans and nature both are in a constant state of flux; moving, changing, sensing, and reacting to their context and information they gather and perceive. A barrier is formed between the built environment and humans and nature due to the fact that their inherent characteristics are utterly contrasting. It is commonly estimated that persons in urban areas spend at least 80% of their time indoors. This suggests that the quality of the indoor environment can have a significant impact on comfort, health, and overall sense of well being. The indoor environment of buildings should thus be designed and controlled, as to provide a comfortable and healthy space for occupants. In order to maintain the quality of the indoor environment, we mechanically condition our buildings to achieve constant, uniform and comfortable environments. The maintenance of thermal equilibrium between the human body and its environment is one of the primary requirements. History of thermal comfort and climate design shows a definite relation between them and research is needed to know “What are comfort conditions?” and “How buildings could adapt themselves to these conditions”.
BIOSORPTIVE REMOVAL OF HEAVY METAL ZINC FROM SYNTHETIC WASTEWATER USING DUCKWEED
Ankita Suhag,Richa Gupta,Archana Tiwari
International Journal of Biomedical Research , 2013, DOI: 10.7439/ijbr.v2i10.191
Abstract: This study focused on the removal of Zinc from wastewater consisting of its solution using the aquatic plant Duckweed. Batch experiments were setup for studying the biosorption by Duckweed at different initial metal ion concentrations, pH and surrounding temperatures using Atomic Absorption Spectrophotometer. The results from different initial metal ion concentrations experiment concluded that up to 20 mg/g, best sorption of Zinc was seen. The initial pH plays a vital role in removal of Zinc from solution. As a pH of upto 6 in solution showed maximum sorption, higher pH deteriorated the growth of the plant. For different surrounding temperatures, 20-24 °C promoted maximum growth. However, plant was also able to grow and adsorb at higher temperatures. At the end of experiment, when all the parameters were standardized, snails were introduced in a setup containing these parameters to check their effect on planta€ s efficiency. The removal of Zinc was enhanced. The results indicated that Duckweed plant is highly adaptive and continues to clean wastewater even in stress conditions.
MOLECULAR DYNAMICS: BASIC STUDY
Richa Gupta, Archana Tiwari and Mahavir Yadav
International Journal of Bioinformatics Research , 2012,
Abstract: Molecular mechanics (MM) these days tends to be concerned only with prediction of local minima on molecular potential energy surfaces. QSAR properties are often calculated in order to assist high-volume screening studies in pharmaceuticals applications. Should we want to study the motions of the molecule, all that would be needed would be to investigate the normal modes of vibration (which can be obtained from the hessian). MM does not take account of zero point vibrations and the calculations refer to a molecule at 0 K, when it is completely at rest. Workers in the modeling field often refer to MM as energy minimization. Molecular modeling is readily available for QSAR studies, pharmacophore studies. Its implementation can be for the design of vaccine, and drugs for therapeutic use.
BIOSORPTIVE REMOVAL OF HEAVY METALS FROM WASTEWATER USING DUCKWEED
Ankita Suhag,Richa Gupta,Archana Tiwari
International Journal of Biomedical and Advance Research , 2011, DOI: 10.7439/ijbar.v2i8.42
Abstract: Water pollution has been recognized as a problem for decades. The use of heavy metals in industries and their regular mining increases their concentration in water bodies. Unlike organic compounds, metals cannot degrade, and therefore effective cleanup requires their immobilization to reduce or remove toxicity. A few conventional methods employed to remove heavy metals from wastewater are expensive, require skilled labors and maintenance. Therefore, the use of aquatic plants has come up since the last few decades. Duckweed is one such plant employed as a biosorbent and has been considered a better alternative than any other aquatic plant because of high tolerance to cold than water hyacinth, more easily harvested than algae, capable of rapid growth (0.1 to 0.5 g g-1 day-1) and small size of plant. This study aims to determine the suitability of this plant for biosorbing toxic heavy metals commonly found in industrial wastewater, domestic wastewater, and seepage water.
PHYTOREMEDIATION OF LEAD FROM WASTEWATER USING AQUATIC PLANTS
Divya Singh,Richa Gupta,Archana Tiwari
International Journal of Biomedical Research , 2013, DOI: 10.7439/ijbr.v2i7.124
Abstract: Increasing urbanization, industrialization and over population is one of the leading causes of environmental degradation and pollution. Heavy metals such as Pb, Zn, Cd, As etc. are the most toxic pollutants which show hazardous effects on all living things. Lead is one such pollutant which disrupts the food chain and is lethal even at low concentrations. The prevailing purification technologies used for removal of contaminants are not only very costly but causes negative impact on ecosystem subsequently. Phytoremediation, an eco-friendly technology which is both ecologically sound and economically viable is an attractive alternative to the current cleanup methods that are very expensive. This technology involves efficient use of aquatic plants to remove, detoxify or immobilize heavy metals. The purpose of this review is to assess the current state of phytoremediation as an innovative technology and to discuss its usefulness and potential in the remediation of lead contaminated water.
BIOSORPTIVE REMOVAL OF HEAVY METAL ZINC FROM SYNTHETIC WASTEWATER USING DUCKWEED
Ankita Suhag,Richa Gupta,Archana Tiwari
International Journal of Biomedical Research , 2011, DOI: 10.7439/ijbr.v2i10.191
Abstract: This study focused on the removal of Zinc from wastewater consisting of its solution using the aquatic plant Duckweed. Batch experiments were setup for studying the biosorption by Duckweed at different initial metal ion concentrations, pH and surrounding temperatures using Atomic Absorption Spectrophotometer. The results from different initial metal ion concentrations experiment concluded that up to 20 mg/g, best sorption of Zinc was seen. The initial pH plays a vital role in removal of Zinc from solution. As a pH of upto 6 in solution showed maximum sorption, higher pH deteriorated the growth of the plant. For different surrounding temperatures, 20-24°C promoted maximum growth. However, plant was also able to grow and adsorb at higher temperatures. At the end of experiment, when all the parameters were standardized, snails were introduced in a setup containing these parameters to check their effect on plant’s efficiency. The removal of Zinc was enhanced. The results indicated that Duckweed plant is highly adaptive and continues to clean wastewater even in stress conditions.
PHYTOREMEDIATION OF LEAD FROM WASTEWATER USING AQUATIC PLANTS
Divya Singh,Richa Gupta,Archana Tiwari
International Journal of Biomedical Research , 2011, DOI: 10.7439/ijbr.v2i7.124
Abstract: Increasing urbanization, industrialization and over population is one of the leading causes of environmental degradation and pollution. Heavy metals such as Pb, Zn, Cd, As etc. are the most toxic pollutants which show hazardous effects on all living things. Lead is one such pollutant which disrupts the food chain and is lethal even at low concentrations. The prevailing purification technologies used for removal of contaminants are not only very costly but causes negative impact on ecosystem subsequently. Phytoremediation, an eco-friendly technology which is both ecologically sound and economically viable is an attractive alternative to the current cleanup methods that are very expensive. This technology involves efficient use of aquatic plants to remove, detoxify or immobilize heavy metals. The purpose of this review is to assess the current state of phytoremediation as an innovative technology and to discuss its usefulness and potential in the remediation of lead contaminated water.
A Multimodal Data Mining Framework for Revealing Common Sources of Spam Images
Chengcui Zhang,Wei-Bang Chen,Xin Chen,Richa Tiwari
Journal of Multimedia , 2009, DOI: 10.4304/jmm.4.5.313-320
Abstract: This paper proposes a multimodal framework that clusters spam images so that ones from the same spam source/cluster are grouped together. By identifying the common sources of spam images, we can provide evidence in tracking spam gangs. For this purpose, text recognition and visual feature extraction are performed. Subsequently, a two-level clustering method is applied where images with visually similar illustrations are first grouped together. Then the clustering result from the first level is further refined using the textual clues (if applicable) contained in spam images. Our experimental results show the effectiveness of the proposed framework.
Investigation on Temperature Sensing of Nanostructured Zinc Oxide Synthesized via Oxalate Route  [PDF]
Richa Srivastava
Journal of Sensor Technology (JST) , 2012, DOI: 10.4236/jst.2012.21002
Abstract: A detailed study is reported of the synthesis and characterization of n- type ZnO nanomaterial and its application as temperature sensor. The ZnO nanomaterial has been synthesized through pyrolysis of the oxalate produced by a conventional precipitation method. It is synthesized by flash heating the oxalate at 450°C for 15 min. Pellet of this material was prepared and used as a sensing element. The variations in resistance of sensing pellet at different temperatures were recorded. The relative resistance was decreased linearly with increasing temperatures over the range, 120°C - 260°C. The activation energy of ZnO calculated from Arrhenius plot was found 1.12 eV. Temperature response in terms of the relative variation, ΔR, of sensor resistance to a given temperature was measured. Scanning electron micrograph of the sensing element has been studied. Pellet of the ZnO is comprised of nanorods of varying diameters and different lengths. Diameter of ZnO nanorods varies from 75 to 300 nm. X-ray diffraction pattern of the sensing element reveal their nano-crystalline nature. Optical characterization of the sensing material was carried out by UV-visible spectrophotometer. By UV-Vis spectra, the estimated value of band gap of ZnO was found 4.7 eV.
Investigation of Surface Tryptophan of Protein by Selective Excitation at 305 nm  [PDF]
Vishvanath Tiwari, Monalisa Tiwari
Journal of Biophysical Chemistry (JBPC) , 2015, DOI: 10.4236/jbpc.2015.63009
Abstract: Intrinsic fluorescence of tryptophan is a powerful tool that is used to investigate structure, dynamics, and folding-unfolding of proteins. Here, we have signified the importance of selective monitoring of “surface” tryptophans from the “buried” tryptophans in a protein via selective excitation of surface tryptophan using light of 305 nm wavelength. We have also enlightened the effect of pH and temperature on the conformation of protein by selective excitation of surface tryptophan of protein using 305 nm light. The result concludes that this novel approach could be used to investigate surface tryptophan of protein selectively at diverse conditions.
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