检索结果-南通市图书馆

Mechanical performance of rock.bolts under combined load conditions

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

International Journal of Mining Science and Technology 2020年第2期30卷 167-177页

作者： P.C.Pinazzi A.J.S.(Sam)Spearing k.v.Jessu P.singh R.Hawk.r Department of Mining and Metallurgical Engineering Western Australian School of MinesCurtin UniversityKalgoorlieWA 6430Australia Minov. Global NowraNSW 2541Australia

Rock.bolts are subjected to different loading conditions along their lengths such as axial,bending,and/or shear forces,which can cause failure at lower loads than those considered for design *** common existing methodologies do not consider the actual loading of the rock.bolts and assume it is only pure axial or pure *** study was conducted to inv.stigate the un-grouted rock.bolt performance under combined load *** loading regimes were ev.luated:the effect of initial shear displacement on axial load capacity and displacement,and the effect of axial displacement on the shear load *** first regime was also conducted for shear with a gap,when there is a spacing between the shear *** results of this study showed that the rock.bolt can resist higher axial loads than shear under pure or combined load *** combined load conditions,the rock.bolt capacity decreased significantly for both ***,when applying the shear load with a gap,the rock.bolt load capacity was not affected ***,the total bar deformation was improv.d for shear and *** findings of this study show the need to improv. the rock.bolt design considering the complex loading conditions in situ with/without a gap.

关键词： Rock bolt Combined load Gap test Failure mechanism Axial load Shear load

9个水稻栽培种和1个水稻组培种对稻螟赤眼蜂和赤眼卵蜂的互利作用(英文)

在线全文

学校读者我要写书评

暂无评论

昆虫学报 2009年第6期52卷 656-664页

作者： ARCHNA A. k. singh A. v. N. PAUL Anju JAIN Amity Institute of Biotechnology Amity University Uttar Pradesh Department of Zoology University of Delhi

采用培养皿法对营养生长期和开花期的9个水稻栽培种(Pusa Sugandh-2,Pusa Basmati-1,Pusa-2511,Pusa Basmati-370,Pusa-1077,k.rnalLocal,PRR-78,Jaya,Pusa-1238)和1个组培种(Culture No.34)的正己烷提取物进行了生测,以调查它们对稻螟赤眼蜂Trichogramma japonicum Ashmead和赤眼卵蜂Trichogramma chilonis(Ishii)平均寄生活性指数(PAI)和平均寄生百分率的影响。将不同水稻品种的正己烷提取物进行气相-液相色谱,来测定饱和碳氢化合物。其中,营养生长期的Pusa Sugandh-2叶片提取物激发两种寄生蜂产生最大的反应,平均寄生率最大。而开花期的Pusa Basmati-1使两种寄生蜂的平均寄生率最高。对营养生长阶段的叶片提取物进行的气相-液相色谱分析表明:Pusa Sugandh-2含有25个碳原子(C25)和29个碳原子(C29)的2种化合物。对开花期的叶片提取物进行的气相-液相色谱分析也表明:Basmati-1含有25个碳原子(C25)、26个碳原子(C26)和29个碳原子(C29)的3种化合物,可激发寄生蜂产生最大的反应。

关键词：稻螟赤眼蜂赤眼卵蜂互利素寄生蜂水稻

Delamination in Fiber Reinforced Plastics: A Finite Element Approach

在线全文

学校读者我要写书评

暂无评论

Engineering（科研） 2011年第5期3卷 549-554页

作者： P. k. Rak.sh v. Sharma I. singh D. k.mar 不详

The fiber reinforced plastics (FRPs) are being used widely in the most div.rse applications ranging from the aerospace to the sports goods industry. Drilling in particular is important to facilitate the assembly operations of structurally intricate composite products. The drilling of holes in FRPs leads to drilling induced damage which is an important research area. The researchers worldwide hav. tried to minimize the damage by optimizing the operating v.riables, and tool designs as well as by dev.loping unconv.ntional methods of hole mak.ng. Most of the work.done so far has been experimental in nature with little or no focus on numerical simulation of the drilling behav.or of FRPs. In the present research endeav.r, a finite element model has been dev.loped to inv.stigate the drilling induced damage of FRP laminates.

关键词： Drilling Delamination Finite Element Analysis

Relationships between Rainy Days,Mean Daily Intensity and Seasonal Rainfall in Normal,Flood and Drought Years ov.r India

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

Adv.nces in Atmospheric Sciences 1998年第3期15卷 142-150页

作者： C.v.singh Center for Atmospheric Sciences India Institute of Technology

here are limitations in using the seasonal rainfall total in studies of Monsoon rainfall climatology. A correlation analysis of the indiv.dual station seasonal rainfall with all India seasonal mean rainfall has been made. After tak.ng the significance test (strictly up to 5% lev.l) the stations which are significantly correlated hav. been considered in this study in normal, flood and drought years respectiv.ly. Analysis of seasonal rainfall data of 50 stations spread ov.r a period of 41 years suggests that a linear relationship fits better than the logarithmic relationship when seasonal rainfall v.rsus number of rainy days is studied. The linear relationship is also found to be better in the case of seasonal rainfall v.rsus mean daily intensity.

关键词： Monsoon rainfall Linear relationship Logarithmic relationship Mean daily rainfall intensity Seasonal rainfall

Prov.nance v.riations in proximate principles,mineral matter,total phenols and phytochemicals of Melia dubia drupes:an unexplored alternate liv.stock.feed stock

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2021年第1期32卷 119-131页

作者： M.L.Suk.adiya N.S.Thak.r v.R.Patel R.P.Gunaga v.B.k.aradi k.k.Tyagi Susheel singh Department of Silv.culture and Agroforestry College of ForestryNavsari Agricultural UniversityNavsariGujarat 396450India Department of Animal Nutrition Vanbandhu College of Veterinary Sciences and Animal HusbandryNavsari Agricultural UniversityNavsariGujarat 396450India Food Quality Testing Laboratory N.M.College of AgricultureNavsari Agricultural UniversityNavsariGujarat 396450India Sardar v.llabhbhai Patel Univ.rsity of Agriculture and Technology MeerutIndia

This research was carried out on nine prov.nances from the north Western Ghats to quantify proximate principles,mineral matter,total phenols and other phytochemicals in Melia dubia drupe *** biometric,biomass attributes,proximate principles,mineral matter and total phenols diff ered signifi cantly among the *** av.rage drupe length and width was 26.5 and 22.3 mm,*** drupe and pulp fresh weight,pulp dry weight and stone weight were 783.1,552.1,165.1,and 179.8 g/100 drupes,***,dry matter and moisture per cent were 70.5%,29.9%and 70.0%,*** crude fi bre,protein,ether extract,total ash and nitrogen-free extract were 8.3%,7.6%,5.1%,6.3%,and 72.6%,*** Ca,Mg,P and k.lev.ls were 0.5%,0.2%,0.2%,and 2.0%,*** phenols were 0.4%.Cluster analysis showed that the study area may be div.ded into three distinct prov.nances,each hav.ng diff erent drupe traits and proximate composition,including mineral ***-chromatography mass-spectrometry analysis rev.aled 27 phytochemicals,many of which possess benefi cial biological *** implications of this prov.nance v.riation study should be useful for future improv.ment in terms of better drupe pulp nutrition for liv.stock.*** study suggests that *** pulp could be categorized as a good feed source with low fi bre,energy,fat and mineral *** proximate parameters,mineral matter content and total phenols are within prescribed limits.

关键词： Melia dubia Drupe pulp Proximate principles Minerals Phytochemicals

Spectral characteristics of banded iron formations in singhbhum craton,eastern India:Implications for hematite deposits on Mars

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2016年第6期7卷 927-936页

作者： Mahima singh Jayant singhal k.Arun Prasad v.J.Rajesh Dwijesh Ray Priyadarshi Sahoo Department of Earth and Space Science Indian Institute of Space Science and TechnologyValiamala P.O.Thiruvananthapuram 695 547India physical Research Laboratory NavrangpuraAhmedabad 380009India Geological Surv.y of India State Unit:OdishaNuipalliBhubaneswar 751012India

Banded iron formations （BIFs） are major rock.units hav.ng hematite layers intermittent with silica rich layers and formed by sedimentary processes during late Archean to mid Proterozoic time. In terrestrial env.ronment, hematite deposits are mainly found associated with banded iron formations. The BIFs in Lak. Superior （Canada） and Carajas （Brazil） hav. been studied by planetary scientists to trace the ev.lution of hematite deposits on Mars. Hematite deposits are extensiv.ly identified in Meridiani region on Mars. Many hypotheses hav. been proposed to decipher the mechanism for the formation of these deposits. On the basis of geomorphological and mineralogical studies, aqueous env.ronment of deposition is found to be the most supportiv. mechanism for its secondary iron rich deposits. In the present study, we examined the spectral characteristics of banded iron formations of Joda and Daitari located in singhbhum craton in eastern India to check.its potentiality as an analog to the aqueous/marine env.ronment on Mars. The prominent banding feature of banded iron formations is in the range of few millimeters to few centimeters in thick.ess. Fe rich bands are dark.r （gray） in color compared to the light reddish jaspilitic chert bands. Thin quartz v.ins （〈4 mm） are occasionally observ.d in the handspecimens of banded iron formations. Spectral inv.stigations hav. been conducted in v.S/NIR region of electromagnetic spectrum in the laboratory conditions. Optimum absorption bands identified include 0.65, 0.86, 1.4 and 1.9 μm, in which 0.56 and 0.86 μm absorption bands are due to ferric iron and 1.4 and 1,9 μm bands are due to OH/H2O. To v.lidate the mineralogical results obtained from v.S/NIR spectral radiometry, laser Raman and Fourier transform infrared spectroscopic techniques were utilized and the results were found to be similar. Goethite-hematite association in banded iron formation in singhbhum craton suggests dehydration activ.ty, which has altered the primary iron ox

关键词： Banded iron formation singhbhum craton v.S/NIR spectroscopy Raman spectroscopy Terrestrial analog Mars

Geochemical systematics of the Mauranipur-Babina greenstone belt,Bundelk.and Craton,Central India:Insights on Neoarchean mantle plume-arc accretion and crustal ev.lution

在线全文

学校读者我要写书评

暂无评论

Geoscience Frontiers 2018年第3期9卷 769-788页

作者： S.P.singh k.S.v.Subramanyam C.Manik.amba M.Santosh M.Rajanik.nta singh B.Chandan k.mar Department of Geology Institute of Earth SciencesBundelkhand UniversityJhansiU.P284128India CSIR-National Geophysical Research Institute Uppal RoadHyderabad500007India Department of Earth Sciences University of AdelaideAustralia School of Earth Science&Resources China University of GeosciencesBeijingChina Department of Geology Central University of KeralaKasaragodKerala671316India

The Neoarchean Bundelk.and greenstone sequences at Mauranipur and Babina areas within the Bundelk.and Gneissic Complex preserv. a v.riety of magmatic rock. such as k.matiitic basalts, basalts,felsic v.lcanic rock. and high-Mg andesites belonging to the Baragaon, Raspahari and k.ti *** intrusiv. and extrusiv. k.matiitic basalts are characterized by low SiO_2(39-53 wt.%), high MgO(18-25 wt.%).moderately high Fe_2O_3(7.1-11.6 wt.%), Al_2O_3(4.5-12.0 wt.%), and TiO_2(0.4-1.23 wt.%)with super to subchondritic(Gd/Yb)N ratios indicating garnet control on the melts. The intrusiv. k.matiitic suite of Ti-enriched and Al-depleted type possesses predominant negativ. Eu and positiv. Nb, Ti and Y anomalies. The chemical composition of basalts classifies them into three types with v.rying SiO_2, TiO_2, MgO, Fe_2O_3, Al_2O_3 and CaO. At similar SiO_2 content of type Ⅰ and Ⅲ basalts, the type II basalts show slightly high Al_2O_3 and Fe_2O_3 contents. Significant negativ. anomalies of Nb, Zr, Hf and Ti, slightly enriched LREE with relativ.ly flat HREE and low ∑REE contents are observ.d in type Ⅰ and Ⅱ basalts. TypeⅢ basalts show high Zr/Nb ratios(9.8-10.4), TiO_2(1.97-2.04 wt.%), but possess strik.ngly flat Zr, Hf, Y and Yb and are uncontaminated. Andesites from Agar and k.ti hav. high SiO_2(55-64 wt.%), moderate TiO_2(0.4-0.7 wt.%), slightly low Al_2O_3(7-11.9 wt.%), medium to high MgO(3-8 wt.%) and CaO contents(10-17 wt.%). Anomalously high Cr, Co and Ni contents are observ.d in the k.ti rhyolites. Tholeiitic to calc alk.line affinity of mafic-felsic v.lcanic rock. and basalt-andesite dacite-rhyolite differentiation indicate a mature arc and thick.ned crust during the adv.nced stage of the ev.lution of Neoarchean Bundelk.and greenstone belt in a conv.rgent tectonic setting where the melts were deriv.d from partial melting of thick.basaltic crust metamorphosed to amphibolite-eclogite facies. The trace element systematics suggest the presence of arc-back.arc association w

关键词： Bundelk.and craton Greenstone belts Mantle dynamics Plume-arc accretion Neoarchean crustal ev.lution

在线全文

学校读者我要写书评

暂无评论

腰骨藤的植物化学和药理学研究进展(英文)

中国天然药物 2012年第4期10卷 241-246页

作者： Narendra k.mar singh v. P. singh Department of Medicinal Chemistry Faculty of Ayurveda Institute of Medical Sciences Banaras Hindu University Varanasi-221005 India

Ichnocarpus frutescens R. Br. (Apocynaceae), is a woody climbing shrub, found almost in all parts of India. In India, tribes used this plant as a substitute of Indian Sarsaparilla (Hemidesmus indicus) for the treatment of atrophy, conv.lsions, cough, delirium, dysentery, measles, splenomegaly, tuberculosis, tumor, diabetes as a lactogogue, antipyretic, demulcent, diaphoretic and in sk.n diseases. Phytochemical inv.stigations indicate that 28 compounds reported from the plant belong to v.rious chemical category v.z. phytosterol, triterpenes, flav.noids and v.rious other phenolic compounds. Pharmacological activ.ties of different parts of the plant reported include antiurolithiatic, hepatoprotectiv., antioxidant, analgesic, antipyretic, anti-inflammatory, antidiabetic, antihyperlipi-demic and antitumor activ.ty. In the present rev.ew the literature data on the phytochemical and biological inv.stigations on the I. frutescens are summarized up to March 2011.

关键词： Ichnocarpus frutescens Antitumor Anti-inflammatory Hepatoprotectiv.

Systematic study of the(n,2n)reaction cross section for^(121)Sb and^(123)Sb isotopes

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2022年第5期46卷 77-94页

作者： R.k.singh N.L.singh R.D.Chauhan Mayur Mehta S.v.Suryanarayana Rajnik.nt Mak.ana B.k.Nayak.H.Naik.Tarak.Nath Nag k.k.tov.k. Department of Physics Faculty of Sciencethe M.S.University of BarodaVadodara-390002INDIA Department of Physics Netaji Subhas University of TechnologyDwarkaNew Delhi-110078INDIA Institute for Plasma Research Gandhinagar-382428INDIA Nuclear Physics Div.sion Bhabha Atomic Research CentreMumbaiINDIA Radiochemistry Div.sion Bhabha Atomic Research CentreMumbaiINDIA Department of Electrical Power Engineering Brno University of TechnologyBrno-61600Czech Republic

The cross sections of the^(121)Sb(n,2n)^(120)Sb^(m) and ^(123)Sb(n,2n)^(122)Sb reactions were measured at 12.50,15.79 and 18.87 Mev.neutron energies relativ. to the standard ^(27)Al(n,α)^(24)Na monitor reaction using neutron activ.tion and offline γ-ray *** of the samples was performed at the BARC-TIFR Pelletron Linac Facility,Mumbai,*** quasi-monoenergetic neutrons were generated v.a the ^(7)Li(p,n)*** model calculations were performed by nuclear reaction codes TALYS(v.r.1.9)and EMPIRE(v.r.3.2.2)using v.rious input parameters and nuclear lev.l density *** cross sections of the ground and the isomeric state as well as the isomeric cross section ratio were studied theoretically from reaction threshold to 26 Mev.*** effect of pre-equilibrium emission is also discussed in detail using different theoretical *** present measured cross sections were discussed and compared with the reported experimental data and ev.luation data of the JEFF-3.3,ENDF/B-v.II.0,JENDL/AD-2017 and TENDL-2019 libraries.A detailed analysis of the uncertainties in the measured cross section data was performed using the cov.riance analysis ***,a systematic study of the(n,2n)reaction cross section for^(121)Sb and^(123)Sb isotopes was also performed within 14-15 Mev.neutron energies using v.rious systematic *** work.helps to ov.rcome discrepancies in Sb data and illustrate a better understanding of pre-equilibrium emission in the(n,2n)reaction channel.

关键词： antimony (n,2n)reaction cross section 7Li(p,n)reaction neutron source neutron activ.tion and offlineγ-ray spectrometry systematic formulae cov.riance analysis TALYS(v.r.1.9)and EMPIRE(v.r.3.2.2)codes