检索结果-南通市图书馆

Photometric studies of two W UMa type variables in the field of distant open cluster NGC 6866

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2016年第4期16卷 87-96页

作者： yogesh chandra joshi Rukmini Jagirdar Santosh joshi Aryabhatta Research Institute of Observational Sciences Manora PeakNainital 263002India Center for Advanced Study in Astronomy Osmania UniversityHyderabad 500007India

We present photometric analysis of the two W UMa type binaries identified in the field of distant open star cluster NGC 6866. Although these systems, namely ID487 and ID494, were reported by joshi et al., a detailed study of these stars has not been carried out before. The orbital periods of these stars are found to be 0.415110±0.000001 day and 0.366709±0.000004 day, respectively. Based on the photometric and infrared colors, we find their respective spectral types to be K0 and K3. The photometric light vari- ations of both stars show the O＇Connell effect which can be explained by employing a dark spot on the secondary components. The V and I band light curves are analyzed using the Wilson-Devinney （WD） code and relations given by Gazeas which yield radii and masses for the binary components of star ID487 of R1 = 1.24 ± 0.01R,R2 = 1.11 4- 0.02Re, and M1 = 1.24 ± 0.02Me, M2 = 0.96 ±0.05Me and for star ID494 of R1 = 1.22 ± 0.02Re, R2 = 0.81 4- 0.01 Re, and M1 = 1.20 4- 0.06 Me, M2 = 0.47 4- 0.01 Me.

关键词： methods: observational -- techniques: photometric -- binaries: eclipsing -- stars: fundamen-tal parameters

Population I Cepheids and understanding star formation history of the Small Magellanic Cloud

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2016年第4期16卷 71-78页

作者： yogesh chandra joshi Auro Prasad Mohanty Santosh joshi Aryabhatta Research Institute of Observational Sciences Manora PeakNainital 263002India National Institute of Technology Rourkela 769008India

In this paper, we study the age and spatial distributions of Cepheids in the Small Magellanic Cloud （SMC） as a function of their ages using data from the OGLE III photometric catalogue. A period - age relation derived for Classical Cepheids in the Large Magellanic Cloud （LMC） has been used to find the ages of Cepheids. The age distribution of the SMC Classical Cepheids is found to have a peak at log（Age）： 8.40 ± 0.10 which suggests that a major star formation event might have occurred in the SMC about 250 4- 50 Myr ago. It is believed that this star forming burst had been triggered by close interactions of the SMC with the LMC and/or the Milky Way. A comparison of the observed spatial distributions of the Cepheids and open star clusters has also been carried out to study the star formation scenario in the SMC.

关键词： stars: Cepheids -- star type: Pop I (classical) -- galaxies: SMC -- methods: statistical

Editorial note for the Geodesy and Geodynamics journal special issue:Remote Sensing and GIS applications in crustal deformation and neotectonics

在线全文

学校读者我要写书评

暂无评论

Geodesy and Geodynamics 2022年第3期13卷 189-191页

作者： Ajay Kumar Taloor Girish chandra Kothyari Shangmin Zhao Rajwant Mayank joshi Department of Remote Sensing and GIS University of JammuJammu 180006India Active Fault Research Group Institute of Seismological ResearchGandhinagar 382009India Department of Surveying and Mapping Taiyuan University of Technology No.79Yingze West RoadTaiyuan 030024China Science and Engineering Research Board Government of IndiaNew Delhi 110016India GB Pant Institute of Himalayan Environment Sikkim Regional Centre Pangthang 737101India

Crustal deformation and neotectonics are well-understood phenomena that happen almost on every part of the Earth and have some diastrophic effects on the Earth’s *** understand these effects,Remote Sensing(RS)and(GIS)have sharpened the human ability to learn about the scientiflc reasons for the Earth’s dynamic activities,including active tectonics and surface landform changes in spatially and temporally.

关键词： tectonics Earth crustal

Feature-based augmentation and classification for tabular data

在线全文

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2022年第3期7卷 481-491页

作者： Balachander Sathianarayanan yogesh chandra Singh Samant Prahalad S.Conjeepuram Guruprasad Varshin B.Hariharan Nirmala Devi Manickam Amrita School of Engineering Amrita Vishwa VidyapeethamCoimbatoreIndia

Generating synthetic samples for a tabular data is a strenuous *** of the time,the columns(features)in the dataset may not follow an ideal distribution *** objective of the proposed algorithm,Histogram Augmentation Technique(HAT),is to generate a dataset whose distribution is similar to that of the original *** augmentation is achieved based on individual columns,where separate algorithms are designed for continuous and discrete *** also use features of an object for *** humans make a judgement,they notice prominent features and characterise the perceived ***,conventional Machine Learning classifiers are designed and trained on the basis of *** the features as the basis for classification,Feature Importance Classifier(FIC)has been attempted in this *** treats every feature independent of each other,and ranks the features based on its dependence with the classified *** has been found that the FIC has the highest accuracy and has improved the accuracy by 5.54%on average,when it's compared to other *** suggested algorithms have been experimented on five datasets and compared with two augmentation algorithms and four state-of-the-art ML classification algorithms.

关键词： function classifier columns

Assessment of reproductive health service utilization in urban slums: Evidence from Western Rajasthan

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian pacific Journal of Reproduction 2023年第2期12卷 52-57页

作者： Jyoti Sharma Nitin Kumar joshi yogesh Kumar Jain Kuldeep Singh Pankaj Bhardwaj School of Public Health All India Institute of Medical SciencesJodhpurIndia Department of Community Medicine and Family Medicine and School of Public Health All India Institute of Medical SciencesJodhpurIndia

Objective:To assess the utilization of reproductive health services in urban slum of Jodhpur city,***:A community based cross-sectional study was conducted in an urban slums of Jodhpur city amongst 300 married women of reproductive age between March and June ***-structured questionnaire was used to gather demographic data and information about utilization of antenatal care(ANC)services,delivery and post-partum ***:The majority of females were aged less than 25 years(n=195;65.0%),married after 18 years(n=240;80%),living in extended families(n=265;88.3%)and with monthly family income less than 10000 rupees(n=182;60.7%).Statistically significant associations were found between≥4 ANC visits and educational level of secondary and above(OR 2.47,95%CI 1.03–6.28;P=0.04),older age(OR 15.70,95%CI 14.87–16.54 for women aged 26-35 years,OR 16.14,95%CI 12.12–20.01 for women aged≥36 years;P<0.01),and backward and general castes(OR 15.91,95%CI 13.57–17.85 for backward caste and OR 8.11,95%CI 8.07–8.26 for general category of caste;P<0.01).Seven percent of females had undergone *** age was associated with higher risks of postpartum complications(OR 1.06,95%CI 1.01–1.57 for women aged 26-35 years,OR 3.56,95%CI 1.29–4.69 for women aged≥36 years;P<0.01).In addition,risks of postpartum complications were associated with backward and general castes(OR 1.69,95%CI 1.34–2.13 for backward classes and OR 5.01,95%CI 4.29–5.31 for general category castes;P<0.01),and more than 4 ANC visits(OR 0.20,95%CI 0.09–0.34;P<0.01).Conclusions:More frequent ANC visits are associated with a lower risk of postpartum ***,a high utilization of reproductive health services represents good implementation of reproductive and child health programme at the peripheral level resulting in a stark rise in maternal health indicators in the state of Rajasthan.

关键词： Female Pregnancy Maternal health Maternal health services Prenatal care Postpartum period Facilities and services utilization Health services accessibility

Ethanol steam reforming study over ZSM-5 supported cobalt versus nickel catalyst for renewable hydrogen generation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2019年第3期27卷 677-684页

作者： Ashutosh Kumar Ram Prasad yogesh chandra Sharma Department of Chemistry Indian Institute of Technology (Banaras Hindu University) Varanasi Department of Chemical Engineering & Technology Indian Institute of Technology (Banaras Hindu University) Varanasi

The renewable hydrogen generation through ethanol steam reforming is one of the anticipated areas for sustainable hydrogen generation. To elucidate the role of Ni and Co with ZSM-5 support, catalysts were prepared by wet impregnation method and ethanol steam reforming(ESR) was performed. The catalysts were characterized by HR-XRD, ATR–FTIR, HR-SEM, TEM with SAED, EDAX, surface area analyzer and TPR. It had shown complete ethanol conversion at 773 K, but the selectivity in hydrogen generation was found higher for 10% Ni/ZSM-5 catalyst as compared to 10% Co/ZSM-5. The 10% Ni/ZSM-5 catalyst has about 72% hydrogen selectivity at temperature 873 K. It indicates that Ni is a more sustainable catalyst as compared to Co with ZSM-5 support for ESR. The C_2H_4 was found major undesirable products up to 823 K temperature. Nevertheless, the 10% Ni/ZSM-5 catalyst had shown its stability for high temperature(873 K) ESR performance.

关键词： Ethanol steam reforming Zeolite Hydrogen Renewable energy Catalyst

Anthropogenic disturbances and status of forest and wildlife in the dry deciduous forests of Chhattisgarh state in India

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2012年第1期23卷 45-52页

作者： chandra Prakash Kala yogesh Dubey Ecosystem & Environment Management Indian Institute of Forest Management P.B. No. 357 Nehru Nagar Bhopal - 462 003 Madhya Pradesh INDIA

The advent of modem forces and the changes in socio- economic patterns of forest dwellers have increased the pressures on the forests. In order to mitigate such pressures and also to protect the forests and wildlife the model of protected areas networks has shifted and en- hanced such pressures in the unprotected natural forests due to several reasons. Being a low profile category of protected status and continuous human settlements, the present study highlights the case of dry deciduous forests of Sarguja district of Chhattisgarh state of India. The major objec- tives of this study were to quantify the status of forests and wildlife and also to determine the extent of anthropogenic disturbances faced by the dry deciduous forests of central India. Transect and silent drive count methods were used for sampling wildlife and quadrat method was used for sampling vegetation. Besides, the local uses of various forest pro- duces were also studied in view of understanding the people dependency on forests. The forest vegetation, in the study area, was pre-dominated by Shorea robusta, which had Madhuca indica, Diospyrus melanoxylon and Buchnania lanzan as the major companion species. The forest had either the high girth class mature tree species or the saplings. The low vegeta- tion cover and density were due to the high anthropogenic pressures mainly in the form of heavy livestock grazing and collection of etlmo- botanically important species. The study though reveals that the area is not rich in wildlife and the forest is fragmented, the area still supports some important species, which include many rare and endangered plants and animals. The findings of this study have been discussed in view of the management and conservation of the forest and wildlife in the dry deciduous forests.

关键词： dry deciduous forest central India wildlife anthropogenicdisturbances biodiversity conservation

Catalytic effects of Cu-Co~* on the thermal decomposition of AN and AN/KDN based green oxidizer and propellant samples

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2018年第3期14卷 250-260页

作者： Pratim Kumar Puran chandra joshi Rajiv Kumar Shelly Biswas Department of Space Engineering & Rocketry Birla Institute of Technology Department of Mechanical Engineering Vidya Vihar Institute of Technology

This paper presents the catalytic effects of Cu-Co~* catalyst on the decomposition of AN and AN/KDN based oxidizer and propellant samples. Ozawa-Flynn-Wall(OFW) iso-conversional method was used for the kinetic studies and to compute the activation energy(Ea) values for various decomposition steps of the prepared oxidizer and propellant samples in the temperature range of 50 e500C. TG-DTG experiments were carried out for both oxidizer and propellant samples at the heating rates of 3, 5, and 10C/min. AN/KDN based oxidizer samples were prepared by an evaporative co-crystallization method. Citric acid sol-gel method was used for the synthesis of Cu-Co~* catalyst. The propellant sample contains HTPB as the fuel binder along with other ingredients such as TDI, DOA, and Glycerol. The Cu-Co~* catalyst was used as 2% by weight to the total weight of catalyzed oxidizer and propellant samples. It was observed from the present study that, Cu-Co~* catalyst helps in reducing the Ea values for AN and AN based propellant samples. However, with the percentage increment of KDN in the AN crystals, Ea value ***, it was observed that Cu-Co~* catalyst stabilizes the initial partial decomposition of KDN.

关键词：催化氧化剂催化效果热分解 Cu 燃料取样 TG-DTG 催化剂

Impacts of Bioinoculants Pseudomonas jesenii MP1 and Rhodococcus qingshengii S10107 on Chickpea (Cicer arietinum L.) Yield and Soil Nitrogen Status

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2019年第3期29卷 388-399页

作者： Divya joshi Ramesh chandra Deep chandra SUYAL Saurabh KUMAR Reeta GOEL Department of Microbiology College of Basic Sciences and Humanities Govind Ballabh Pant University of Agriculture and Technology Pantnag ar-263145 Uttarakhand (India) Department of Soil Science College of Agriculture Govind Ballabh Pant University of Agriculture and Technology Pantnagar- 263145 Uttarakhand (India)

Cold-adapted bioinoculants are considered as harbingers of sustainable hill agriculture. Therefore, two previously characterized psychrotolerant diazotrophs, Pseudomonas jesenii MP1 and Rhodococcus qingshengii S10107, were evaluated for their plant growthpromoting potential for chickpea (Cicer arietinum L.) grown under natural field conditions. Comparative analysis of agronomical and biochemical crop parameters revealed the irrelevance of chemical fertilizers for chickpea production;the diazotrophs alone were sufficient to fulfil the crop's nutritional requirement. However, the integrated use of bacterial strains in combination with urea at 20 kg N ha^-1 as urea was being recommended for higher crop yield and better soil nitrogen status. Quantitative polymerase chain reaction (qPCR) and denaturing gradient gel electrophoresis (DGGE)-based soil bacterial dynamics unveiled the persistence of both diazotrophs until the end of the crop maturation period without affecting the native micro-flora. Therefore, these bioinoculants can be explored as natural nitrogen resource, and an additional incentive in their bio-formulation will be a step towards agricultural sustainability.

关键词： agricultural sustainability denaturing gradient gel electrophoresis (DGGE) hill agriculture psychrotolerance N fertilizer N fixation N uptake quantitative polymerase chain reaction (qPCR)