检索结果-南通市图书馆

Biosorption of Ni(Ⅱ) ions from aqueous solution using modified Aloe barbadensis Miller leaf powder

在线全文

学校读者我要写书评

暂无评论

Water science and Engineering 2019年第1期12卷 27-36页

作者： shweta Gupta s.k.sharma Arinjay kumar University school of Chemical Technology Guru Gobind Singh Indraprastha University

This study aimed to investigate the biosorption potential of Na2CO3-modified Aloe barbadensis Miller (Aloe vera) leaf (MABL) powder for removal of Ni(II) ions from a synthetic aqueous solution. Effects of various process parameters (pH, equilibrium time, and temperature) were investigated in order to optimize the biosorptive removal. The maximum biosorption capacity of MABL was observed to be 28.986 mg/g at a temperature of 303 k, a biosorbent dose of 0.6 g, a contact time of 90 min, and a pH value of 7. Different kinetic models (the pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models) were evaluated. The pseudo-second-order kinetic model was found to be the best fitted model in this study, with a coefficient of determination of R^2 =0.974. Five different isotherm models (the Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, and Brunauer-Emmett-Teller (BET) models) were investigated to identify the best-suited isotherm model for the present system. Based on the minimum chi-square value (X^2 =0.027) and the maximum coefficient of determination (R^2 =0.996), the Langmuir isotherm model was found to represent the system well, indicating the possibility of monolayer biosorption. The sticking probability (s*) was found to be 0.41, suggesting a physisorption mechanism for biosorption of Ni(II) on MABL. The biosorbent was characterized using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (sEM), zeta potential, and BET surface area, in order to understand its morphological and functional characteristics.

关键词： Biosorption A. barbadensis Miller leaf powder Ni(II) Biosorption isotherm sticking probability kinetics

CaMoO_4:Dy^(3+),k^+ near White Light Emitting Phosphor:structural,Optical and Dielectric Properties

在线全文

学校读者我要写书评

暂无评论

Journal of Materials science & Technology 2013年第7期29卷 633-638页

作者： s.k.sharma s.Dutta s.som P.s.Mandal Department of Applied Physics Indian School of MinesDhanbad 826004India

Undoped, Dy^3＋ doped and Dy^3＋, k^＋ codoped calcium molybdate phosphors have been synthesized by solid-state reaction method. X-ray diffraction studies reveal the tetragonal structure of the prepared phosphors having crystallite size 15-50 nm. scanning electron microscopy （sEM） studies reveal the morphology and crystallite size of the prepared phosphors. Photoluminescence studies indicate that there are blue and yellow emissions at 489 and 576 nm, respectively corresponding to Dy^3＋ ion. The introduction of k＋ ion significantly influences the blue and yellow emissions which causes the near white light emission from this codoped phosphor. The intense absorption peak of the codoped phosphor at 210 nm is attributed to the band gap and a shoulder at 240 nm appears due to charge transfer from oxygen ions to neighbouring molybdenum ions. The band gap of the codoped phosphor is calculated as 5.5 eV from the absorption studies. The dielectric properties such as permittivity and dielectric loss are studied as a function of *** The authors are thankful to the Department of science and Technology, New Delhi （Government of India） for funding this work under the Project sR/FTP/Ps-087/2010.

关键词： X-ray diffraction Photoluminescence Absorption Dielectric

Effect of substrate and Annealing Temperatures on Mechanical Properties of Ti-rich NiTi Films

在线全文

学校读者我要写书评

暂无评论

Journal of Materials science & Technology 2010年第11期26卷 961-966页

作者： A.kumar s.k.sharma s.Bysakh s.V.kamat s.Mohan Defence Metallurgical Research Laboratory Department of Instrumentation Indian Institute of Science Central Glass and Ceramics Research Institute

The effect of substrate and annealing temperatures on mechanical properties of Ti-rich NiTi films deposited on si （100） substrates by DC magnetron sputtering was studied by *** films were deposited at two substrate temperatures viz.300 and 400 ℃.NiTi films deposited at 300 ℃ were annealed for 4 h at four different temperatures,i.e.300,400,500 and 600 C whereas films deposited at 400 ℃ were annealed for 4 h at three different temperatures,i.e.400,500 and 600 ℃.The elastic modulus and hardness of the films were found to be the same in the as-deposited as well as annealed conditions for both substrate *** a given substrate temperature,the hardness and elastic modulus were found to remain unchanged as long as the films were ***,both elastic modulus and hardness showed an increase with increasing annealing temperature as the films become *** results were explained on the basis of the change in microstructure of the film with change in annealing temperature.

关键词： NiTi thin film Annealing Nanoindentation

Influence of Crop Nutrition on Grain Yield,seed Quality and Water Productivity under Two Rice Cultivation systems

在线全文

学校读者我要写书评

暂无评论

Rice science 2013年第2期20卷 129-138页

作者： Y.V.sINGH k.k.sINGH s.k.sharma Centre for Conservation and Utilization of Blue Green Algae Indian Agricultural Research Institute seed Production Unit Indian Agricultural Research Institute

The system of rice intensification （sRI） is reported to have advantages like lower seed requirement,less pest attack,shorter crop duration,higher water use efficiency and the ability to withstand higher degree of moisture stress than traditional method of rice *** this background,sRI was compared with traditional transplanting technique at Indian Agricultural Research Institute,New Delhi,India during two wet seasons （2009-2011）.In the experiment laid out in a factorial randomized block design,two methods of rice cultivation [conventional transplanting （CT） and sRI] and two rice varieties （Pusa Basmati 1 and Pusa 44） were used under seven crop nutrition treatments,viz.T 1,120 kg/hm2 N,26.2 kg/hm2 P and 33 kg/hm2 k;T 2,20 t/hm2 farmyard manure （FYM）;T 3,10 t/hm2 FYM＋ 60 kg/hm2 N;T 4,5 t/hm2 FYM＋ 90 kg/hm2 N;T 5,5 t/hm2 FYM＋ 60 kg/hm2 N＋ 1.5 kg/hm2 blue green algae （BGA）;T 6,5 t/hm2 FYM＋ 60 kg/hm2 N＋ 1.0 t/hm2 Azolla,and T 7,N 0 P 0 k 0 （control,no NPk application） to study the effect on seed quality,yield and water *** sRI,soil was kept at saturated moisture condition throughout vegetative phase and thin layer of water （2-3 cm） was maintained during the reproductive phase of rice,however,in CT,standing water was maintained in crop growing *** revealed that CT and sRI gave statistically at par grain yield but straw yield was significantly higher in CT as compared to *** quality was superior in sRI as compared to *** nutrient management （INM） resulted in higher plant height with longer leaves than chemical fertilizer alone in both the rice *** yield attributes such as number of effective tillers per hill,panicle length and panicle weight of rice in both the varieties were significantly higher in INM as compared to chemical fertilizer *** yields of both the varieties were the highest in INM followed by the recommended doses of chemical *** grain yield and its attributes of Pusa 44 were significantly

关键词： rice crop nutrition grain yield seed quality system of rice intensification water productivity

seasonal variability of ambient NH_3, NO, NO_2 and sO_2 over Delhi

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental sciences 2010年第7期22卷 1023-1028页

作者： s.k.sharma A.Datta T.saud M.saxena T.k.Mandal Y.N.Ahammed B.C.Arya Radio and Atmospheric sciences Division National Physical Laboratory Council of Scientific and Industrial Research (CSIR)

We present the diurnal and seasonal variability of ambient NH3, NO, NO2 and sO2 over Delhi, India. Ambient NH3, NO and NO2 were measured continuously during winter, summer and autumn seasons using NH3- and NOx-analyzer, which operates by chemiluminescence method with a higher estimation efficiency （〉 90%） than the chemical trap method （reproducibility 4.7%）. Prominent diurnal, day-to-day and seasonal variations of ambient mixing ratio of NH3, NO, NO2 and sO2 were observed during the study period. seasonal variation with higher mixing ratio in winter was observed for all measured trace gases except NO. Day-night variation of all measured trace gases observed was higher in winter in comparison with summer. Late morning increase in NO2 mixing ratio might be attributed to conversion of NO to NO2 with the interaction ofO3.

关键词： ambient NH3, diurnal and seasonal variations chemiluminescence method ambient NO, NO2 and sO2

在线全文

学校读者我要写书评

暂无评论

小麦粒重杂种优势的表现

国外农学（麦类作物） 1991年第3期 4-5页

作者： s.k.sharma 刘曙东

通过3轮机械混选,从UP363×WC457、UP368×shailza和WH157×Bulk 1858 3个杂交组合的后代群体中选育出5个具有不同粒重的品系。这些品系以及sonalika品种之间进行除反交外的各种可能的杂交。粒重最重(65g)的品系几乎与最重的杂种相当。... 详细信息

通过3轮机械混选,从UP363×WC457、UP368×shailza和WH157×Bulk 1858 3个杂交组合的后代群体中选育出5个具有不同粒重的品系。这些品系以及sonalika品种之间进行除反交外的各种可能的杂交。粒重最重(65g)的品系几乎与最重的杂种相当。不同相联度亲本的杂种是等于还是低于中值取决于相联度,并因此表现出负的杂种优势或者无杂种优势。含有等位基因离散亲本的杂种粒重高,且具有高的正杂种优势。因此,等位基因的离散是杂种优势的主要原因。配合力效应受亲本中等位基因分布方式的影响。相联亲本表现出正的一般配合力(gca)效应,而离散亲本则表现出负的一般配合力效应。

关键词：小麦粒重杂种优势杂交

在线全文

学校读者我要写书评

暂无评论

印度分盾细蜂总科新种记述(摘要)(英文)

昆虫分类学报 1983年第3期 219-224页

作者： s.k.sharma 印度动物调查所

本文记载3新种: Ceraphron siwalikus, sp. nov. 本种与古北区种类C. spinifer(kieffer)相近似,m脉与r脉之比相同,后背板有一刺,但不同处在于触角柄节长度与以下5节而不是4节之和相等,第2触角节的长度为厚度的3倍而不是2倍。本种亦与C. ... 详细信息

本文记载3新种: Ceraphron siwalikus, sp. nov. 本种与古北区种类C. spinifer(kieffer)相近似,m脉与r脉之比相同,后背板有一刺,但不同处在于触角柄节长度与以下5节而不是4节之和相等,第2触角节的长度为厚度的3倍而不是2倍。本种亦与C. alticola(kieffer)相近,但不同处为复眼不裸出而盖有稠密的毛,体形也较大。 Dendrocerus dalhousieanus, sp. nov. 本种与古北区种类D. fuscipennis(kieffer)相近似,不同处在于触角柄节基部不为淡黄色;翅在翅痣后方不为褐色。 Dendrocerus pykarus, sp. nov. 本种与D. indicus(Mani)不同处在于体长为2.10毫米,而后者为1.29毫米;触角第5索节不为圆柱形,而呈锯齿状;头部刻纹亦不相同。本种与暂时鉴定的D. fuscipes(kieffer)相近似,区别处在于仅只触角7～9节为圆柱形;翅痣位置稍微超过前缘的中部,离翅端不太近。

关键词： length view 触角柄节 body than

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

计算机配色

国外纺织技术 1998年第3期 38-40页

作者： s.k.sharma 杨红穗

纱线中纤维的转移既是必要的,又是有害的。因为没有纤维的转移,就不可能有一个连接良好的纱线结构,而且纱线也将不能承受任何张力。因此对一根纺出的纱而言,纤维的转移是必要的。至于说有害,是因为基于纱线的结构,纤维的转移会使对纱线... 详细信息

纱线中纤维的转移既是必要的,又是有害的。因为没有纤维的转移,就不可能有一个连接良好的纱线结构,而且纱线也将不能承受任何张力。因此对一根纺出的纱而言,纤维的转移是必要的。至于说有害,是因为基于纱线的结构,纤维的转移会使对纱线力学性能的理论论述变得困难。不同的工作者提出了众多的纤维转移测量方法。Hearl、Gupta和Merhant已明确了纱线中纤维的理想转移,在这种理想转移中,纤维规则而整齐地从纱线外层向纱芯转移,随之又回到外层,这种方式下纱线中纤维集合体的密度保持为常数。

关键词：纤维转移 DX OD 强度值混纺纱染色纤维计算机配色电脑配色

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

计算机配色

国外纺织技术（纺织针织服装化纤染整） 1998年第3期 38-40页

作者： s.k.sharma 杨红穗

关键词：计算机配色染色纤维染整工业