MODELLING ON RURAL OUT-MIGRATION SYSTEM

HIMANSHU PANDEY 서울대학교 사회발전연구소 1995 Journal of Asian Sociology Vol.24 No.2

Synthesis of graphene oxide and its application for the adsorption of Pb+2 from aqueous solution

Himanshu Raghubanshi,Shalate M. Ngobeni,Adeniyi Olugbenga Osikoya,Ntaote David Shooto,Charity Wokwu Dikio,Eliazer Bobby Naidoo,Ezekiel Dixon Dikio,Rajiv K. Pandey,Rajiv Prakash 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-

Lead (Pb) ion is a heavy metal ion contaminant in geochemical systems, and has non-repairable harmfuleffects due to their high toxicity. They create severe threats to human health and ecological balance. Therefore, it is highly needed to remove Pb ions from contaminated water/aqueous media. In this study,graphene oxides (GOs) were prepared using “Hummers” and “improved” methods for studying the effectof processing parameters on the as-prepared GO. The processing parameters such as purification anddrying process; and the effect of un-reacted graphiteflakes (UGFs) on the thermal stability of GO wereinvestigated. The as-prepared GOs were characterized through X-ray diffraction (XRD), scanning electronmicroscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), Fouriertransform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and Raman spectroscopy. Further, we applied the as-prepared GO for the removal of Pb ions (Pb2+) from aqueous solution. Theadsorption measurements were conducted through atomic absorption spectroscopy (AAS). The batchadsorption experiments were carried out to study the effect of initial concentration, contact time, andtemperature on the adsorption of Pb2+ from aqueous solution onto the GO. It was found that the Pb2+adsorption on GO increased with increase in the initial concentration of Pb2+. A maximum adsorption of120 mg/g took place at initial concentration of 60 mg/L Pb2+. The adsorption studies recorded a relativelyrapid uptake of Pb2+ by GO and followed pseudo-second-order kinetic model. The results indicated asignificant potential of GO as an adsorbent for Pb2+ removal.

Thermophoresis and suction/injection roles on free convective MHD flow of Ag–kerosene oil nanofluid

Himanshu Upreti,Alok Kumar Pandey,Manoj Kumar 한국CDE학회 2020 Journal of computational design and engineering Vol.7 No.3

In this article, themass and heat transfer flow of Ag–kerosene oil nanofluid over a cone under the effects of suction/injection, magnetic field, thermophoresis, Brownian diffusion, and Ohmic-viscous dissipation was examined. On applying the suitable transformation, PDEs directing the flow of nanofluid were molded to dimensionless ODEs. The solution of the reduced boundary value problem was accomplished by applying Runge–Kutta–Fehlberg method via shooting scheme and the upshots were sketched and interpreted. The values of shear stress and coefficients of heat and mass transfer were attained for some selected values of governing factors. The obtained results showed that when the amount of surface mass flux shifts from injection to the suction domain, the heat and mass transfer rate grew uniformly. However, they have regularly condensed with the rise in the magnitude of the magnetic field and particle volume fraction. Several researches have been done using cone-shaped geometry under the influence of various factors affecting the fluid flow, yet, there exists no such investigation that incorporated the response of viscous-Ohmic dissipation, heat absorption/generation, suction/blowing, Brownian diffusion, and thermophoresis on the hydro-magnetic flow of silver-kerosene oil nanofluid over a cone.

Experimental and numerical bending deflection of cenosphere filled hybrid (Glass/Cenosphere/Epoxy) composite

Harsh Kumar Pandey,Himanshu Agrawal,Subrata Kumar Panda,Chetan Kumar Hirwani,Pankaj V Katariya,Hukum Chand Dewangan 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.73 No.6

The influence on flexural strength of Glass/Epoxy laminated composite curved panels of different geometries (cylindrical, spherical, elliptical, hyperboloid and flat) due to inclusion of nano cenosphere filler examined in this research article. The deflection responses of the hybrid structure are evaluated numerically using the isoparametric finite element technique and modelled mathematically via higher-order displacement structural kinematics. To predict the deflection values, a customised in-house computer code in MATLAB environment is prepared using the higher-order isoparametric formulation. Subsequently, the numerical model validity has been established by comparing with those of available benchmark solution including the convergence characteristics of the finite element solution. Further, a few cenosphere filled hybrid composite are prepared for different volume fractions for the experimental purpose, to review the propose model accuracy. The experimental deflection values are compared with the finite element solutions, where the experimental elastic properties are adopted for the computation. Finally, the effect of different variable design dependent parameter and the percentages of nano cenosphere including the geometrical shapes obtained via a set of numerical experimentation.

Effects of Antiretroviral Therapy on the Survival of Human Immunodeficiency Virus-positive Adult Patients in Andhra Pradesh, India: A Retrospective Cohort Study, 2007-2013

Ram Bajpai,Himanshu Chaturvedi,Lakshmanan Jayaseelan,Pauline Harvey,Nicole Seguy,Laxmikant Chavan,Pinnamaneni Raj,Arvind Pandey 대한예방의학회 2016 Journal of Preventive Medicine and Public Health Vol.49 No.6

Objectives: The survival outcomes of antiretroviral treatment (ART) programs have not been systematically evaluated at the state level in India. This retrospective study assessed the survival rates and factors associated with survival among adult human immunodeficiency virus (HIV)-infected patients in Andhra Pradesh, India. Methods: The present study used data from 139 679 HIV patients aged ≥15 years on ART who were registered from 2007 to 2011 and were followed up through December 2013. The primary end point was death of the patient. Mortality densities (per 1000 person-years) were calculated. Kaplan-Meier and Cox-regression models were used to estimate survival and explore the factors associated with survival. Results: The overall median follow-up time was 16.0 months (2.0 months for the deceased and 14.0 months for those lost to follow-up). Approximately 13.2% of those newly initiated on ART died during follow-up. Of those deaths, 56% occurred in the first three months. The crude mortality rate was 80.9 per 1000 person-years at risk. The CD4 count (adjusted hazard ratio [aHR],4.88; 95% confidence interval [CI], 4.36 to 5.46 for <100 cells/mm3 vs. >350 cells/mm3), functional status (aHR, 3.05; 95% CI, 2.82 to 3.30 for bedridden vs. normal), and body weight (aHR, 3.69; 95% CI, 3.42 to 3.97 for <45 kg vs. >60 kg) were strongly associated with the survival of HIV patients. Conclusions: The study findings revealed that high mortality was observed within the first three months of ART initiation. Patients with poor baseline clinical characteristics had a higher risk of mortality. Expanded testing and counseling should be encouraged, with the goal of ensuring early enrollment into the program followed by the initiation of ART in HIV-infected patients.

Effects of Antiretroviral Therapy on the Survival of Human Immunodeficiency Virus-positive Adult Patients in Andhra Pradesh, India: A Retrospective Cohort Study, 2007-2013

Bajpai, Ram,Chaturvedi, Himanshu,Jayaseelan, Lakshmanan,Harvey, Pauline,Seguy, Nicole,Chavan, Laxmikant,Raj, Pinnamaneni,Pandey, Arvind The Korean Society for Preventive Medicine 2016 Journal of Preventive Medicine and Public Health Vol.49 No.6

Objectives: The survival outcomes of antiretroviral treatment (ART) programs have not been systematically evaluated at the state level in India. This retrospective study assessed the survival rates and factors associated with survival among adult human immunodeficiency virus (HIV)-infected patients in Andhra Pradesh, India. Methods: The present study used data from 139 679 HIV patients aged ${\geq}15$ years on ART who were registered from 2007 to 2011 and were followed up through December 2013. The primary end point was death of the patient. Mortality densities (per 1000 person-years) were calculated. Kaplan-Meier and Cox-regression models were used to estimate survival and explore the factors associated with survival. Results: The overall median follow-up time was 16.0 months (2.0 months for the deceased and 14.0 months for those lost to follow-up). Approximately 13.2% of those newly initiated on ART died during follow-up. Of those deaths, 56% occurred in the first three months. The crude mortality rate was 80.9 per 1000 person-years at risk. The CD4 count (adjusted hazard ratio [aHR],4.88; 95% confidence interval [CI], 4.36 to 5.46 for < $100cells/mm^3$ vs. > $350cells/mm^3$), functional status (aHR, 3.05; 95% CI, 2.82 to 3.30 for bedridden vs. normal), and body weight (aHR, 3.69; 95% CI, 3.42 to 3.97 for <45 kg vs. >60 kg) were strongly associated with the survival of HIV patients. Conclusions: The study findings revealed that high mortality was observed within the first three months of ART initiation. Patients with poor baseline clinical characteristics had a higher risk of mortality. Expanded testing and counseling should be encouraged, with the goal of ensuring early enrollment into the program followed by the initiation of ART in HIV-infected patients.

A comparison of ATR-FTIR and Raman spectroscopy for the non-destructive examination of terpenoids in medicinal plants essential oils

Rahul Joshi,Sushma Kholiya,Himanshu Pandey,Ritu Joshi,Omia Emmanuel,Ameeta Tewari,김태현,조병관 충남대학교 농업과학연구소 2023 Korean Journal of Agricultural Science Vol.50 No.4

Terpenoids, also referred to as terpenes, are a large family of naturally occurring chemical compounds present in the essential oils extracted from medicinal plants. In this study, a nondestructive methodology was created by combining ATR-FT-IR (attenuated total reflectance- Fourier transform infrared), and Raman spectroscopy for the terpenoids assessment in medicinal plants essential oils from ten different geographical locations. Partial least squares regression (PLSR) and support vector regression (SVR) were used as machine learning methodologies. However, a deep learning based model called as one-dimensional convolutional neural network (1D CNN) were also developed for models comparison. With a correlation coefficient (R2) of 0.999 and a lowest RMSEP (root mean squared error of prediction) of 0.006% for the prediction datasets, the SVR model created for FT-IR spectral data outperformed both the PLSR and 1 D CNN models. On the other hand, for the classification of essential oils derived from plants collected from various geographical regions, the created SVM (support vector machine) classification model for Raman spectroscopic data obtained an overall classification accuracy of 0.997% which was superior than the FT-IR (0.986%) data. Based on the results we propose that FT-IR spectroscopy, when coupled with the SVR model, has a significant potential for the non-destructive identification of terpenoids in essential oils compared with destructive chemical analysis methods.

Tissue-cultured regeneration and ecological values in major bamboo species

Sharma Avinash,Manpoong Chowlani,Gohain Anwesha,Pandey Himanshu,Padu Gompi,Aku Hage 한국생태학회 2022 Journal of Ecology and Environment Vol.46 No.3

Background: Promising specific growth regulators are employed in the tissue cultures of various bamboo species. Specific natural hardening mixtures support the acclimatization and adaptation of bamboo under protected cultivation. Results: The growth regulators like 2, 4-Dichlorophenoxyacetic acid (2, 4-D), Naphthaleneacetic Acid (NAA), Thidiazuron (TDZ), 6-Benzylaminopurine (BAP), Kinetin, Gelrite, Benzyl Adenine (BA), Indole Butyric Acid (IBA), Coumarin, Putrescine, Gibberellic acid (GA3), Indole Acetic Acid (IAA) has been widely used for callus induction, root regeneration and imposing plant regeneration in various species of bamboo such as Bambusa spp. and Dendrocalamus spp. Different combinations of growth regulators and phytohormones have been used for regenerating some of the major bamboo species. Natural hardening materials such as cocopeat, vermicompost, perlite, cow dung, farmyard manure, compost, soil, garden soil, and humus soil have been recommended for the acclimatization and adaptation of bamboo species. Standard combinations of growth regulators and hardening mixtures have imposed tissue culture, acclimatization, and adaptation in major bamboo species. Conclusions: Bamboo contributes to soil fertility improvement and stabilization of the environment. Bamboo species are also involved in managing the biogeochemical cycle and have immense potential for carbon sequestration and human use. This paper aims to review the various growth regulators, natural mixtures, and defined media involved in regenerating major bamboo species through in vitro propagation. In addition, the ecological benefits of safeguarding the environment are also briefly discussed.