检索结果-南通市图书馆

Determination of Proteins by Measuring Total Internal-reflected Resonance Light Scattering Signals on Water/Tetrachloromethane Interface with Evans Blue and Cetyltrimethylammonium Bromide

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

Chemical Research in Chinese Universities 2005年第4期21卷 426-430页

作者： HUANGCheng-zhi FENGPing LIYuan-fang ZHAOHua-wen CollegeofChemistryandChemicalEngineering SouthwestUniversityChongqing400715P.R.China

A sensitive and selective assay of proteins is proposed based on measuring the total internal-reflected resonance light scattering(TIR-RLS) signals produced on the water/tetrachloromethane(H_2O/CCl_4) interface. In an aqueous medium with pH value in the range of 3.29—3.78, electrostatic attraction occurs between the negatively charged Evans Blue(EB) and positively charged proteins, forming hydrophobic ion associates and resulting in EB-protein adsorption on H_2O/CCl_4 interface. The presence of cetyltrimethylammonium bromide prompts this adsorption, resulting in strongly enhanced TIR-RLS signals. The intensity of the enhanced TIR-RLS at 360—370 nm was found to be proportional to the concentration of proteins. For bovine serum albumin and human serum albumin, the linear range of detection is 0.07—1.2 μg/mL and the limits of detection are 6.68 and 6.30 ng/mL(3σ), respectively, while for lysozyme, the linear range of detection is 0.06—1.0 μg/mL and the limit of detection is 6.0 ng/mL(3σ). The content of the total albumin in a human urine sample could be directly determined by using the standard addition method with a percent recovery of 97.6%—104.1%, and the RSD ranging from 1.9% to 4.2%.

关键词： Total internal-reflected resonance light scattering(TIR-RLS) Protein Evans Blue(EB) Cetyltrimethylammonium bromide(CTMAB)

Analysis on Dissociation of Pyramidal I Dislocation in Magnesium by Generalized-Stacking-Fault Energy

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第7期28卷 876-882页

作者： Qun Zu Ya-fang Guo Xiao-zhi Tang Institute of Engineering Mechanics Beijing Jiaotong University

The generalized-stacking-fault energies are calculated to illustrate the dissociation of〈c＋a〉dislocation on pyramidal I plane in *** c surfaces of {1011} plane and its adjacent planes {3034} and {3032} are presented using Liu embedded-atom-method potential method,and one possible dissociation path of 1/3{1123} dislocation on {1011} plane with minimum energy is ***,another two reasonable dissociation paths of 1/3{1123} dislocation successively on {3034} and {3032} planes are also ***,based on molecular dynamics simulations of magnesium single crystals under c-axis compression,the possible slip path is further examined and discussed.

关键词： Generalized-stacking-fault energies (GSFEs) Molecular dynamics (MD) 〈c + a〉 slip Dissociation Magnesium

DC performance and AC loss of cable-in-conduit conductors for International Thermonuclear Experimental Reactor

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2016年第3期27卷 176-185页

作者： Wei Zhou Xin-Yu fang jin fang Bo Liu School of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044China Department of Electrical and Computer Engineering University of VictoriaVictoriaBC V8W2Y2Canada Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

A reliable prediction of AC loss is essential for the application of International Thermonuclear Experimental Reactor(ITER) cable-in-conduit conductors(CICCs);however,the calculation of AC loss of ITER CICCs is a cumbersome task due to the complicated geometry of the multistage cables and the extreme operating conditions in *** this paper,we described the models developed for hysteresis and coupling loss calculation,which can be suitable for the construction of ITER magnetic ***,we compared the results of theoretical analysis with the SULTAN test result to evaluate the numerical model we *** addition,we introduced the n-value and AC loss with transport current for CICCs based on the DC measurement results at SULTAN,which lays the foundation for the further study.

关键词：国际热核聚变实验堆交流损耗电缆导体电缆导管直流测量 ITER计划国际热核实验反应堆性能

Synthesis and analysis of new humidity-controlling composite materials

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2017年第5期24卷 594-602页

作者： Jian-li Shang zhi-fang Zong Hao Zhang College of Materials and Mineral Resources Xi’an University of Architecture and TechnologyXi’an 710055China

Gypsum is a traditional building material. To improve the humidity-controlling properties of gypsum, we prepared a new type of humidity-controlling composite using the sol-gel method. Methods to determine the maximum equilibrium moisture content and speed of adsorption/desorption were subsequently applied to analyze the performance of the samples. The appearance and structural properties of the samples were characterized by scanning electronic microscopy (SEM). The experimental results show that the humidity-controlling gel with added LiCl exhibits high moisture storage and that the equilibrium maximum moisture content is 5.652 g/g at a 75.29% relative humidity (RH). A mass ratio of LiCl/sol = 0.15 is demonstrated to be appropriate for the preparation of the new humidity-controlling composites. A coarse network with tiny pores is observed on the surface of the new humidity-controlling composites, and this pore network provides sufficient space for moisture adsorption.

关键词： composite materials gypsum humidity control sol-gel processing adsorption desorption

ANALYTICAL SOLUTION OF GROUNDWATER FLUCTUATIONS IN ESTUARINE AQUIFER

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2005年第5期17卷 641-646页

作者： CHEN jing ZHOU zhi-fang JIA Suo-bao College of Civil Engineering Hohai University Nanjing 210098 China Hydrology and Water Resources Investigation Bureau of Jiangsu Province Nanjing 210029 China

As a basic factor in the environment of estuary, tidal effects in the coastal aquifer have recently attracted much attention because tidal dynamic also greatly influences the solute transport in the coastal aquifer. Previous studies on tidal dynamic of coastal aquifers have focused on the inland propagation of oceanic tides in the cross-shore direction, a configuration that is essentially one-dimensional. Two-dimensional analytical solutions for groundwater level fluctuation in recent papers are localized in presenting the effect of both oceanic tides and estuarine tides in quadrantal aquifer. A two-dimensional model of groundwater fluctuations in estuarine zone in proposed in this paper. Using complex transform, the two-dimensional flow equation subject to periodic boundary condition is changed into time-independent elliptic problem. Based on Green function method, an analytical solution for groundwater fluctuations in fan-shaped aquifer is derived. The response to of groundwater tidal loading in an estuary and ocean is discussed. The result show that its more extensive application than recent studies.

关键词： coastal aquifer analytical solution fanshaped area groundwater fluctuations Green function method estuary environment

Effects of asymmetric rolling process on ridging resistance of ultra-purified 17%Cr ferritic stainless steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2018年第2期25卷 216-225页

作者： Cheng-zhuang Lu jing-yuan Li zhi fang School of Materials Science and Engineering University of Science and Technology Beijing Institute for Advanced Materials and Technology University of Science and Technology Beijing

In ferritic stainless steels, a significant non-uniform recrystallization orientation and a substantial texture gradient usually occur, which can degrade the ridging resistance of the final sheets. To improve the homogeneity of the recrystallization orientation and reduce the texture gradient in ultra-purified 17%Cr ferritic stainless steel, in this work, we performed conventional and asymmetric rolling processes and conducted macro and micro-texture analyses to investigate texture evolution under different cold-rolling conditions. In the conventional rolling specimens, we observed that the deformation was not uniform in the thickness direction, whereas there was homogeneous shear deformation in the asymmetric rolling specimens as well as the formation of uniform recrystallized grains and random orientation grains in the final annealing sheets. As such, the ridging resistance of the final sheets was significantly improved by employing the asymmetric rolling process. This result indicates with certainty that the texture gradient and orientation inhomogeneity can be attributed to non-uniform deformation, whereas the uniform orientation gradient in the thickness direction is explained by the increased number of shear bands obtained in the asymmetric rolling process.

关键词： ferritic stainless steel asymmetric rolling surface ridging texture shear bands

Gravitational perturbations of the Einstein-Euler-Heisenberg black hole

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2022年第8期46卷 287-300页

作者： zhi Luo jin Li Department of Physics Chongqing UniversityChongqing 401331China

The prospect of using gravitational wave detections via the quasinormal modes(QNMs) to test modified gravity theories is exciting area of current *** waves(GWs) emitted by a perturbed black hole(BH) will decay as a superposition of their QNMs of oscillations at the ringdown *** this work,we investigate the QNMs of the Einstein-Euler-Heisenberg(EEH) BH for both axial and polar gravitational *** obtain master equations with the tetrad formalism,and the quasinormal frequencies of the EEH BH are calculated in the 6 th order Wentzel-Kramers-Brill?uin *** is interesting to note that the QNMs of the EEH BH would differ from those of the Reissner-Nordstr?m BH under the EH parameter,which indicates the EH parameter would affect the gravitational perturbations for the EEH BH.

关键词： black hole quasinormal modes gravitational perturbation

Premature thermal decomposition behavior of 3,4-dinitrofurazanfuroxan with certain types of nitrogen-rich compounds

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2023年第8期26卷 102-110页

作者： Jiao Huang Ru-fang Peng Bo jin State Key Laboratory of Environment-friendly Energy Materials Southwest University of Science and TechnologyMianyang621010SichuanPR China

3,4-Dinitrofurazanfuroxan(DNTF),as a high-energy-density material,features good thermal stability and wide *** study aimed to elucidate the thermal decomposition mechanism of DNTF combined with nitrogen-rich compounds containing *** thermal stabilities of DNTF and its hybrid systems were investigated using differential thermal analysis/thermogravimetry(TG),vacuum stability test,and accelerating rate calorimetry under isothermal,non-isothermal,and adiabatic conditions,*** showed that the thermal stability and thermal safety of DNTF significantly decreased after combining with nitrogen-rich compounds containing *** results showed that the activation energy of the DNTF hybrid systems was significantly lower than that of *** TGIR was used to monitor the generation of fugitive gases during the thermal decomposition of the DNTF/5-aminotetrazole(5-ATZ)***,the nitrogen-rich molecules containing N-H interacted extensively with DNTF,and this interaction accelerated the thermal degradation of DNTF.

关键词： DNTF NeH rich Nitrogen compounds Advanced thermal decomposition peak

Pulsations of the High-Amplitude δ Scuti star YZ Bootis

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2018年第1期18卷 11-20页

作者： Tao-zhi Yang Ali Esamdin Jian-Ning Fu Hu-Biao Niu Guo-Jie Feng fang-fang Song jin-Zhong Liu Lu Ma Xinjiang Astronomical Observatory Chinese Academy of Sciences Urumqi 830011 China University of Chinese Academy of Sciences Beijing 100049 China Department of Astronomy Beijing Normal University Beijing 100875 China

We present a study on pulsations of the high-amplitudeδScuti star YZ Boo based on photometric observations in Johnson V and R bands with both the Nanshan 1-m telescope of Xinjiang Astronomical Observatory（XAO）and the Xinglong 85-cm telescope of National Astronomical Observatories,Chinese Academy of Sciences（NAOC）.Fourier analysis of the light curves reveals the fundamental radial mode and its five harmonics,with the fourth and fifth being newly *** new times of maximum light are determined from the light curves,and combined with those in the literature,we construct the O-C diagram,derive a new ephemeris and determine a new value for the updated period of 0.104091579（2）.In addition,the O-C diagram reveals an increasing rate of period change for YZ *** models are calculated and constrained with the observationally determined parameters of YZ *** mass and age of YZ Boo are hence derived as M=1.61±0.05 M_⊙ and age=（1.44±0.14）×10~9 yr,*** both the frequency of the fundamental radial mode and the rate of period change,YZ Boo is located at the post main sequence stage.

关键词： stars:variables:δ Scuti star stars:individual(YZ Boo) stars:oscillations