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- 저자 : Singh Ajai (검색결과 5 건)
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Shree Shashank,Kumar Manoj,Singh Ajai 대한공간정보학회 2021 Spatial Information Research Vol.29 No.2
This study analyzed the spatial and temporal trends of diurnal temperature range (DTR) for 35-years (1983–2017) in the region of the Subarnarekha river basin of Jharkhand, India. The daily data of maximum temperature (Tmax) and minimum temperature (Tmin) were habituated to compute the DTR, whereas rainfall data is used to measure its relationship with DTR, on a monthly annual and seasonal basis. Mann–Kendall test and Sen’s slope method has been used to detect the increasing or decreasing trends in climatic data with their statistical significance. The annual mean DTR of the basin is 11.97 C With a maximum in pre-monsoon (16.36 C) and minimum in monsoon (6.94 C). A significant negative trend (- 0.31 C/decade) was observed in annual DTR over the basin. On a seasonal basis, all four seasons show a negative trend in DTR with the largest significant decreasing trend in the pre-monsoon season (- 0.49 C/decade). On an annual and seasonal basis, a significant negative correlation between DTR and rainfall is found, indicating that rainfall has a significant impact on the variation of DTR in this basin. A concomitant increase in rainfall might be one of the possible causes of the decreases in DTR in the basin.
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Ashwini Kumar,Saw Gautam Kumar,Singh Ajai 대한공간정보학회 2021 Spatial Information Research Vol.29 No.6
The novel coronavirus (COVID-19) pandemic disrupted basic lifestyle of everyone across the globe. To stop the conveyance of the coronavirus into the human body and to flatten the transmission rate curve, almost every country imposed a lockdown. In India, the emergency lockdown was imposed on the 24th of March 2020 which created an economic crisis in the country but proved a boon in disguise for the environment to improve its quality. The study analysed the statuses of air quality with respect to NO2 in pre and during the COVID-19 lockdown period in eight districts of India where tier I cities are located. Nitrous Oxide concentration was determined through Sentinel 5P satellites imagery and Central Pollution Control Board ground station data. The lockdown across the country has helped the environment to regain, and therefore, more studies are required to assess other parameters to explore the implementation of the provision of the well-planned lockdown of 1-week duration in a year for giving enough time to the environment to recuperate. These results show that the study areas (Ahmedabad, Hyderabad, Delhi, Kolkata, Mumbai, Chennai, Bengaluru, and Pune) have witnessed a significant drop in nitrogen dioxide (14–62%) as compared to the same period in 2019. This propose an idea that the devilish, COVID-19 lockdown has proved to be an unknown tool for tranquillizing air pollution (NO2) during a lockdown within the Territory of Indian.
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Understanding planform dynamics of the Ganga River in eastern part of India
Ashwini Kumar,Pathan Shehnaj Ahmed,Singh Ajai 대한공간정보학회 2021 Spatial Information Research Vol.29 No.4
To understand the natural processes of planform change, meandering and formation of braid bars, satellite sensor data of few decades play a significant role. The present research focuses on the planform dynamics of Ganga River from Sahibganj (Jharkhand) to Jalangi in West Bengal, India. This study is based on the sequential river planform maps. These maps were prepared using Landsat 1, Landsat 3, Landsat 4, Landsat 5 and Landsat 7 data for the period 1975–2015 at an interval of 5 years. The sinuosity index, braiding index and spatial analysis of maps were used to assess and classify the river into straight, braided and meander categories. This was observed that braiding index is continuously increasing and the meandering index has decreased from 1.6 to 1.24 during 1975 to 2015. The results showed the changes in channel migration with time and space. From the analysis, it is observed that the factors causing shifting of the Ganga River in some areas are natural and anthropogenic. Landsat images were found to be effective in determining the meandering index, braiding index and planform change of a river.
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Dual-Class Stock Splits and Liquidity
Joonghyuk Kim,Ji-Chai Lin,Ajai Singh,Wen Yu 한국재무학회 2008 한국재무학회 학술대회 Vol.2008 No.11
We examine liquidity effects of dual-class stock splits that change firms’ ownership structure from one share one vote to two classes with disparate voting rights. Following dual-class splits, effective spreads, price impacts, and order execution difficulty increase and the investor base decreases significantly for both superior- and inferior-voting shares. In contrast, following a matched sample of regular splits, the investor base increases and order execution improves significantly. Pursuant to the adoption of extreme form of corporate governance and weakened shareholder rights, and consistent with the implied effects of a deteriorating information environment, we find that dual-class splits adversely affect stock liquidity.
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Anjna Sharma,Asmita Magotra,Santosh Kumar Rath,Priya Wazir,Utpal Nandi,Surrinder Koul,Payare Lal Sangwan,Ajai Prakash Gupta,Gurdarshan Singh 한국약제학회 2018 Journal of Pharmaceutical Investigation Vol.48 No.5
Plant derived natural products have been the major source for treatment of diseases traditionally but with the advent of modern systems of medicine, there is need to explore the active constituents present in it followed by modification for better therapeutic activity, low toxicity and favorable pharmacokinetics to become a drug molecule. A simple, rapid and sensitive high-performance liquid chromatography–tandem mass spectrometry (LC– MS/MS) method was developed and validated according to Food and Drug Administration guidelines for determination of IS01957, a derivative of naturally occurring para coumaric acid in mice plasma. The extraction of the analyte and the internal standard (Carbamazepine) from the plasma samples involved protein precipitation using acetonitrile. Results of validation parameters were met with the acceptance criteria of the FDA guidelines. Method was highly sensitive (5 ng/mL) that could determine very low concentration of compound in plasma The developed and validated method was successfully applied to determine compound’s metabolic stability in mouse liver microsomes (MLM) and human liver microsomes (HLM). Test compound was found to be stable in MLM and HLM in the experimental conditions. Metabolic stability data was extrapolated which was further correlated to pharmacokinetics study in mice through oral, intraperitoneal and intravenous administration. In-vitro half life was found to be greater than 2 h in both MLM and HLM. Hepatic extraction ratio of the compound was found to be in the intermediate range. Pharmacokinetic evaluations revealed that it is a suitable candidate for intraperitoneal as well as oral administration.
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