检索结果-南通市图书馆

Non-spherical aluminum nanoparticles fabricated using picosecond laser ablation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2020年第7期27卷 980-986页

作者： A.brahma swamulu s.Venugopal Rao G.Krishna Podagatlapalli Department of Physics Rajiv Gandhi University of Knowledge TechnologiesNuzvidAndhra Pradesh 521202India Advanced Centre of Research in High Energy Materials(ACRHEM) University of HyderabadHyderabad 500046TelanganaIndia Department of Electronics&Physics Gandhi Institute of Technology and Management Institute of ScienceGandhi Institute of Technology and Management deemed to be UniversityVisakhapatnam 530045Andhra PradeshIndia

We report the picosecond laser ablation of aluminum targets immersed in a polar organic liquid(chloroform,CHCl3)with^2 ps laser pulses at an input energy of^350μ*** synthesized aluminum nanoparticles exhibited a surface plasmon resonance peak at^340 *** electron microscopy images of Al nanoparticles demonstrated the spherical morphology with an average size of(27±3.6)*** formation of smaller spherical Al nanoparticles and the diminished growth could be from the formation of electric double layers on the Al *** addition to spherical aluminum nanoparticles,triangular/pentagonal/hexagonal nanoparticles were also observed in the colloidal *** emission scanning electron microscopy images of ablated Al targets demonstrated laser induced periodic surface structures(LIPsss),which were the high spatial frequency LIPsss(HsF-LIPsss)since their grating period was^280 ***,coarse structures with a period of^700 nm were observed.

关键词： ablation picosecond silver polar periodic surfaces electric double layers

维普期刊数据库

Development and evaluation of robust tree biomass equations for rubber tree (Hevea brasiliensis) plantations in India

在线全文

学校读者我要写书评

暂无评论

Forest Ecosystems 2017年第3期4卷 241-250页

作者： Biplab brahma Gudeta W.sileshi Arun Jyoti Nath Ashesh Kumar Das Department of Ecology and Environmental science Assam University

Background： In India, rubber（Hevea brasiliensis） plantations cover -0.8 million ha of land, emphasizing its significant role in the Earth＇s carbon dynamics. Therefore, it is important to estimate the biomass stocks of plantations precisely in the context of carbon management. Previous studies in India have focused on development of allometric equations for estimating aboveground biomass（AGB） through harvesting younger trees（up to 14 yr）only or on studies with small sample sizes without assessing model bias. The objective of this study was to develop biomass estimation models for different tree components in rubber plantations and assess model predictive performance at the stand ***： A total of 67 trees were harvested from plantations of different ages（6, 15, 27 and 34 yr） in North East India and their diameter at 200 cm（D）, height and dry weights of different tree components were recorded. The data were used for evaluation of H-D and biomass estimation models at the stand ***： The Michaelis-Menten function was found to be the most appropriate model for estimating tree height among 10 commonly used H-D models. For estimation of AGB and coarse root biomass, a model that involves tree volume（i.e. D2 H） was found to provide better prediction than either D or H alone or a model that combines H, D and stand density. The estimated AGB varied from 28 Mg·ha-（-1） in 6 yr. old plantation to 169 Mg·ha-（-1） in 34 yr. old *** coarse root biomass was estimated at 4 Mg·ha-（-1） for 6 yr. old plantation and 12 Mg·ha-（-1） for 34 yr. old ***： It is concluded that models involving tree volume are more appropriate for regional level biomass estimation than simple power-law models for individual stands. We recommend that the power-law model should not be used for estimation of AGB in plantations at different growth stages because power-law parameters can be biased due to data truncation.

关键词： Aboveground biomass Data truncation Michaelis-Menten function Power-law

维普期刊数据库

Morphological phylogeny among 15 accessions of bamboos growing in Kokrajhar district of the Bodoland Territorial Area Districts,Assam

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2018年第5期29卷 1379-1386页

作者： Anusriti Basumatary sushil Kumar Middha Talambedu Usha samik Bhattacharya Birendra Kumar brahma Arvind Kumar Goyal Centre for Bamboo studies and Department of Biotechnology Bodoland University DBT-BIF Centre Department of BiotechnologyPG Research CentreMaharani Lakshmi Ammanni College for Women Department of Biochemistry Maharani Lakshmi Ammanni College for Women Department of Molecular Ecology Max Planck Institute of Chemical Ecology

Bamboo is nature＇s wonderful gift historically associated with the rural population of the Bodoland Territorial Area ***,indiscriminate use of the resource and the ambiguity in the identification of bamboos in the absence of flowering characters pose a potential risk to the bamboo ***,we considered revising the taxonomic positions and phylogenetic relationships among 15 tropical bamboo species using 35 key morphological descriptors（MD） to assess the reliability of vegetative characters in identifying *** phylogenetic tree constructed from the similarity matrix,derived from an unweighted pair group method of analysis（UPGMA） of the 35 MDs,marginally deviated from the conventional taxonomic positions of the bamboo *** the two varieties,one forma of Bambusa vulgaris（***,***,***） and two species of the genus Dendrocalamus（*** and ***）clustered together in a single clade,and *** was distantly placed from their *** discrepancy with the conventional classification might have ensued since only vegetative characters such as culm anatomy,culm sheath,leaf,and leaf sheath were considered in the present *** the phylogenetic relationship among the 15 tropical bamboos（computed from exhaustive MDs）grossly corroborate the conventional taxonomic grouping,a molecular-marker-based multidisciplinary approach should resolve the remaining conflicts in bamboo identification.

关键词： Bamboo Bodoland Culm Culm-sheath Leaf-sheath Phylogenetic relationship conflict

维普期刊数据库

Estimation of the Effect of Anisotropy on Young’s Moduli and Poisson’s Ratios of sedimentary Rocks Using Core samples in Western and Central Part of Tripura, India

在线全文

学校读者我要写书评

暂无评论

International Journal of Geosciences 2014年第2期5卷 184-195页

作者： Jwngsar brahma Anirbid sircar Pandit Deendayal Petroleum University Gandhinagar Raisan Village Raisan India

The velocity anisotropy parameters and elastic constants play a very important role to estimate Young’s modulus and Poisson’s ratios accurately. For geomechanics applications such as hydraulic fracturing design, analysis of wellbore stability and rock failure, determination of in situ stress and assessment of the response of reservoirs and surrounding rocks to changes in pore pressure and stress, Young’s modulus and Poisson’s ratios play a very important role. Four rock samples were collected from four different wells situated in study area. The ultrasonic transmission method has been used to measure P-wave, sh-wave and sv-wave travel times as a function of orientation and confining pressure. The five independent stiffnesses constants, Young’s moduli, Poisson’s ratios and Bulk moduli of the samples were estimated. The Poisson’s ratios ( and ) are varying as the confining pressure is changed. The axial strain is larger than the lateral strain, resulting . For shales, the Young’s modulus measured parallel to bedding E1 is usually greater than the Young’s modulus measured perpendicular to bedding E3. Through this study it has been observed that, there is a strong effect of anisotropy parameters on Young’s modulus and Poisson’s ratio.

关键词： Elastic stiffness shales sandstone sedimentary Rock Anisotropy

The protective effect of Murraya koenigii leaves against carbon tetra chloride-induced hepatic damage in rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Coastal Life Medicine 2014年第4期 313-318页

作者： brahma Naidu Parimi Ramgopal Mopuri Balaji Meriga Department of Biochemistry S.V.U College of SciencesSri Venkateswara UniversityTirupatiAndhra PradeshIndia

Objective:To evaluate the efficacy of methanolic extract of Murraya koenigii(MMK)leaves in attenuating the hepatic damage inflicted by carbon tetrachloride(CCl_(4)),a potent oxidative stress inducer and a model ***:Rats were divided into six groups of five each:normal control group,CCl_(4)group,CCl_(4+)silymarin group,CCl_(4+)MMK group(200 mg/kg body weight),CCl_(4+)MMK group(300 mg/kg body weight)and CCl_(4+)MMK group(500 mg/kg body weight).Rats were intraperitoneally injected with 20%CCl_(4),in corn oil(1 mL/kg body weight)and MMK was orally administered for 3 *** of hepatic markers such as alanine transaminase,aspartate transaminase,alkaline phosphatase and total billirubin were *** of superoxide dismutase,catalase and glutathione peroxidase were assayed and malondialdehyde content was *** histopathological examination,liver microtome sections were prepared and observed under light ***:Oral administration of MMK had significantly reduced the activities of aspartate transaminase,alanine transaminase,alkaline phosphatase and bilirubin content in a dosedependent manner,which were elevated by CCl_(4).However,CCl_(4)-induced rise in lipid peroxidation and drop in superoxide dismutase,catalase and glutathione peroxidase activities were reversed by MMK ***,the hepatoprotective activity of MMK was supported by histopathological examination of liver microtome ***:Our biochemical and histological studies demonstrate the potential antioxidant and hepatoprotective activity of MMK and our results scientifically validate the often use of MMK leaves in food preparation and in Ayurvedic medicine in India and neighboring countries.

关键词： Murraya koenigii Hepatoprotective Carbon tetrachloride Rats silymarin

Antiobesity Activity of <i>Bauhinia purpurea</i>Extract: Effect on Hormones and Lipid Profile in High Calorie Diet Induced Obese Rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Bioscience and Biotechnology 2014年第11期5卷 861-873页

作者： Tiruttani Kuppireddy Padmaja Parim brahma Naidu Ghali Eswara Naga Hanuma Kumar saravanan Ganapathy Meriga Balaji Department of Biochemistry Sri Venkateswara University Tirupati India Department of Biochemistry Center for Biological Sciences K.S.R. College of Arts & Sciences Tiruchengode India

Obesity is well recognized as a global public health concern and the quest continues to explore natural product-based novel therapeutics. Bauhinia purpurea finds its place in traditional medicine as an effective anti-ulcer, antiplatelet, wound healing and hypolipidemic agent. The present study investigated the effects of ethanolic extract of Bauhinia purpurea (EEB) on the changes in body weight, lean mass, fat free mass, fat percent, tissue and plasma lipid profiles, plasma glucose, insulin and insulin resistance as well as on the activity of amylase, lipase, leptin and adiponectin levels in high caloric diet (HCD) induced obese rats. After induction of obesity with HCD, rats were administered orally with EEB (100, 200 and 300 mg·kg-1 BW) or orlistat (5 mg·kg-1 BW) once daily for 42 days. HCD substantially increased the body weight, fat free mass, fat percent, glucose, insulin resistance, tissue and plasma lipid profiles (Except HDL), leptin and the activities of amylase and lipase. EEB at a dose of 300 mg·kg-1 BW exerted its therapeutic effects similar to orlistat in decreasing body weight, insulin resistance, levels of glucose, leptin, plasma and tissue lipids, lipase and amylase but increasing HDL and adiponectin in HCD fed obese rats, which could be due to bioactive factors present in EEB, as revealed by LC-Ms analysis. These findings suggest that EEB administration suppresses high-caloric-diet-induced obesity and it can be developed as a potential candidate for the treatment of obesity and associated complications.

关键词： Obesity Leptin Fat Free Mass Dyslipidemia Inslin Resistance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

回收弛放气用于增加氨产量实例

中氮肥 1986年第2期 55-59页

作者： N.C.brahma s.C.Mittal 王彦益化肥司技术处

印度科塔(Kota)斯里曼肥料化工公司的一座600吨/日的氨厂,安装了弛放气回收装置。整个装置建设费用约2,000万卢比,每天增产氨17吨。合成回路来的1,000Nm~3/h弛放气,循环返回一段转化炉出口气中。在七天多的实际考核中,每天增产氨6吨,对... 详细信息

印度科塔(Kota)斯里曼肥料化工公司的一座600吨/日的氨厂,安装了弛放气回收装置。整个装置建设费用约2,000万卢比,每天增产氨17吨。合成回路来的1,000Nm~3/h弛放气,循环返回一段转化炉出口气中。在七天多的实际考核中,每天增产氨6吨,对工厂没有任何有害影响。

关键词：弛放气合成回路动力消耗装置二段转化炉一段转化炉产量

sperm Quality in Holstein Bulls Friesian and brahmans of Frozen semen Commercially

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Animal sciences 2015年第3期5卷 229-231页

作者： Alejandro Córdova-Izquierdo Gustavo Ruiz-Lang Román Espinosa-Cervantes Adrían Emmanuel Iglesias-Reyes Maximino Méndez-Mendoza Rubén Huerta-Crispín Abel Edmundo Villa-Mancera Ma. De Lourdes Juárez-Mosqueda Pedro sánchez-Aparicio Jaime Olivares-Pérez Juan Eulogio Guerra-Liera Gerardo Cansino-Arroyo Departamento de Producción Agrícola y Animal Universidad Autónoma Metropolitana Unidad Xochimilco México D.F. México Facultad de Veterinaria Benemérita Universidad Autónoma de Puebla Puebla México Departamento de Morfología FMVZ-UNAM México D.F. México Facultad de Veterinaria Universidad Autónoma del Estado de México Toluca México Unidad Académica de Medicina Veterinaria y Zootecnia Universidad Autónoma de Guerrero Guerrero México Facultad de Agronomía Universidad Autónoma de Sinaloa Culiacán México División Académica de Ciencias Agropecuarias Universidad Juárez Autónoma de Tabasco Villahermosa México

The aim of this study was to assess sperm quality (motility, viability and acrosomal integrity) sperm from commercially frozen semen straws two breeds of bulls Bos taurus (holstein Frisian) and Bos indicus (brahman). 9 commercial straws 0.5 ml of Holstein bull semen and 9 brahman bull were thawed, they were kept for two hours at room temperature and motility, viability and acrosomal integrity (NAR) was assessed. The results were 30% motility, viability 40% and 30% of NAR in the Holstein breed. brahma race for motility 40%, 50% and 40% viability was obtained NAR. In conclusion, according to the results of the variables analyzed, the brahman breed in sperm quality was better than the Holstein breed;however, the results of both races meet minimum standards of quality sperm for use in artificial insemination (AI) field level.

关键词： semen Thawed Bulls Frozen semen sperm Quality

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

微量元素

茶业通报 1987年第4期 45-45页

作者： s. Pancleg. MA 秦大东

satyanagan Tea Co、(p)L70植物重要的营养物是N、K、P,但正象人类的生存除通常的营养物以外需要维生素一样,植物包括茶树需要一些微量元素。它们是:硼、锰、镍、钼、钴、铜和铝等。在地质古老的土壤中,有一些微量元素,几乎全部耗尽。... 详细信息

satyanagan Tea Co、(p)L70植物重要的营养物是N、K、P,但正象人类的生存除通常的营养物以外需要维生素一样,植物包括茶树需要一些微量元素。它们是:硼、锰、镍、钼、钴、铜和铝等。在地质古老的土壤中,有一些微量元素,几乎全部耗尽。地质年代非常新的即brahma

关键词：茶树对夹叶摊片微量元素痕量元素阿萨姆印度