检索结果-南通市图书馆

同方期刊数据库

Predispersed Solvent Extraction

在线全文

学校读者我要写书评

暂无评论

Predispersed Solvent Extraction

Third Joint China/USA Chemical Engineering Conference

作者： y.-D. Wang y.-y. huang M. Chen and y.-y. Dai Department of Chemical Engineering Tsinghua University.Beijing 100084 P. R. China

＜正＞Predispersed solvent extraction （PDSE） is a new extraction technique in which one of the two phases （usually.the oil phase） is predispersed into minute droplets. The essential part of this novel technique is the use of colloidal liquid aphrons （CLA） together with colloidal gas aphrons （CGA）. The use of colloidal liquid aphrons in predispersed solvent extraction may.ameliorate the problems such as emulsion formation, reduction of interfacial mass transfer and low interfacial mass transfer areas in separating bioproducts by.solvent extraction. The aim of this paper is to review the PDSE process and the potential applications of CLA, CGA and PDSE for the various areas of separation.

关键词： Predispersed solvent extraction colloidal liquid aphrons colloidal gas aphrons

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

微量钾和钠的纸上色层分析测定法

厦门大学学报(自然科学版) 1956年第3期 14-19页

作者：盧宗兰黄玉英

鹼金属钾、钠的微量测定,近来常用的是火焰光度法,而且火焰光度法也几乎是唯一的一种比较准确的方法,但是这种仪器设备目前还不算普遍,因此寻找其他比较简单的测定方法还是有必要的。 1948年,Fisher,Parsons和Morrison从氨基酸的纸上色... 详细信息

鹼金属钾、钠的微量测定,近来常用的是火焰光度法,而且火焰光度法也几乎是唯一的一种比较准确的方法,但是这种仪器设备目前还不算普遍,因此寻找其他比较简单的测定方法还是有必要的。 1948年,Fisher,Parsons和Morrison从氨基酸的纸上色层分离实验中,证明了一条非常重要的规律,即:“色层谱斑点面积与氨基酸溶液的原始浓度的对数成直线关系”。1949年,Brimley.用热传导和扩散的理论说明了这条规律。如果以S代表斑点面积,C代表未知物原始浓度,则得下列数学关系式:

关键词：离子 Ba 定量测定紫外光灯微量测定未知物溶剂火焰光度法火焰发射光谱法分光光度法氮基酸分折醋酸乙酸对数中含标举

Methoprene does not affect juvenile hormone titers in honey.bee （Apis mellifera） workers

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2018年第2期25卷 235-240页

作者： Zachary.y. huang Stephanie Lin Kiheung Ahn Department of Entomology Michigan State University East Lansing Michigan USA Ecology Evolutionary Biology and Behavior Michigan State University East Lansing Michigan USA BEACON Center for the Study.of Evolution in Action Michigan State University East Lansing Michigan USA and 4High School Honors Science Program 2007 Michigan State University East Lansing Michigan USA

Methoprene, a juvenile hormone （JH） analog, is a widely.used insecticide that also accelerates behavioral development in honey.bees （Apis mellifera）. JH regulates the transition from nursing to foraging in adult worker bees, and treatment with JH or methoprene have both been shown to induce precocious foraging. To determine how methoprene changes honey.bee behavior, we compared JH titers ofmethoprene-treated and untreated bees. Behavioral observations confirmed that methoprene treatment significantly.increased the number of precocious foragers in 3 out of 4 colonies. In only.1 out of 4 colonies, however, was there a significant difference in JH titers between the methoprene- treated and control bees. Further, in all 4 colonies, there was no significant differences in JH titers between precocious and normal-aged foragers. These results suggest that methoprene did not directly.affect the endogenous JH secreted by.corpora allata. Because methoprene caused early.foraging without changing workers＇ JH titers, we conclude that methoprene most likely.acts directly.on the JH receptors as a substitute for JH.

关键词： behavioral development juvenile hormone analog juvenile hormone metho-prene precocious foraging

Novel poly.thy.eneimine/TMC-based nanofiltration membrane prepared on a poly.opamine coated substrate

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

Frontiers of Chemical Science and Engineering 2018年第2期12卷 273-282页

作者： Zhe y.ng Xiaoy. huang Jianqiang Wang Chuy.ng y. Tang Department of Civil Engineering the University of Hong Kong Hong Kong China

Most commercial NF membranes are negatively.charged at the pH range of a ty.ical feed solution. In order to enhance the removal of cations （such as Mg2＋ or Ca2＋）, we utilized poly.thy.eneimine （PEI） and trimesoy. chloride （TMC） to perform interfacial poly.erization reaction on a poly.opamine coated hy.roly.ed poly.cry.lonitrile substrate to obtain a positively.charged nanofiltration membrane. Effects ofpoly.opamine coating time, PEI concentration, TMC reaction time and concentration on the membrane phy.icochemical properties and separation performance were sy.tematically.investigated using scanning electron microscopy. streaming potential and water contact angle measurements. The optimal NF membrane showed high rejection for divalent ions （93.6±2.6% for MgSO4, 92.4±1.3% for MgCl2, and 90.4±2.1% for Na2SO4）, accompanied with NaCl rejection of 27.8±2.5% with a permeation flux of 17.2±2.8 L.m-2.h-1 at an applied pressure of 8 bar （salt concentrations were all 1000 mg.L-1）. The sy.thesized membranes showed promising potentials for the applications of water soft-ening.

关键词： nanofiltration poly.thy.eneimine trimesoy. chloride poly.opamine positively.charged rejection lay.r

NUMERICAL MODELING OF SUSPENDED SEDIMENT TRANSPORT IN CHANNEL BENDS

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

Journal of Hy.rody.amics 2006年第4期18卷 411-417页

作者： huang Sui-liang JIAy.F,WANG Sam S. y. College of Environmental Science and Engineering Nankai University Tianjin 300071 China National Center for Computational Hy.roscience and Engineering The University of Mississippi Oxford USA

An algorithm to compute three-dimensional sediment transport effect was proposed in this paper to enhance the capability.of depth-averaged numerical models. This algorithm took into account of non-uniform distributions of flow velocities and suspended sediment concentrations along water depth, it significantly.enhanced the applicability.of 2D models in simulating open channel flows, especially.in channel bends. Preliminary.numerical experiments in a U-shaped and a sine-generated experimental channel indicate that the proposed method performs quite well in predicting the change of bed-deformation in channel bends due to suspended sediment transport. This method provides an effective alternative for the simulations of channel morphody.amic changes.

关键词： algorithm dispersion terms bends suspended sediment transport 2D numerical model

NUMERICAL SIMULATION OF 3-D CORNER FLOWS IN A CIRCULATING WATER CHANNEL

在线全文

学校读者我要写书评

暂无评论

Journal of Hy.rody.amics 2001年第2期13卷 63-67页

作者： huang, y. Wang, G.Q. Tamashima, M. Shanghai Jiaotong Univ. Shanghai 200030 China

A Navier-Stokes procedure was developed based on a finite volume method to simulate corner flows in circulating water channel (CWC). The standard 2nd-order central scheme together with a deferred correction method was applied for the convective terms. All the other terms were discretized using 2nd order central differencing. The standard k-Ε model was used for the approximation of turbulent flows. First, this method used to calculate the turbulent flows in a 90° bend and the computed results are in good agreements with the experiment. This method was also employ.d to calculate the flows in a model CWC corner.

关键词： Computational fluid dy.amics Computer simulation Finite volume method Laminar flow Navier Stokes equations Three dimensional Turbulent flow

INVESTIGATION OF MULTI-STEP THERMO-MECHANICALTREATMENT OF CAN-FORGED TiAl-BASED ALLOy

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1997年第4期10卷 369-374页

作者： y.H. He B. y. huang y. Liu and y.X. Liu (Powder Metallurgy.Research Institute, Central South University.of Technology. Changsha 410083, China) Central South Univ of Technology Changsha China

The effects of a new technology. multi-step thermo-mechanical treatment, on the microstructure, deformation substructure and mechanical properties at ambient and elevated tempemture of can-forged Ti-33 Al-3 Cr-0.5Mo (wt%) Alloy.were *** results show that, after multi-step thermo-mechanical treatment of can-forged specimens, homogeneous, fine microstructures can be obtained in the whole TiAl-based alloy.specimens. Furthermore, the specimen with homogeneous and fine full lamellae microstructure demonstrutes excellent comprehensive mechanical properties at ambient and elevated temperature.

关键词： TiAl-based alloy mechanical property heat treatment

WAVE RESISTANCE OF WAVE-PIERCING CATAMARANS

在线全文

学校读者我要写书评

暂无评论

Journal of Hy.rody.amics 2000年第4期12卷 88-98页

作者： Lu, X.P. huang, y. Shi, Z.K. Coll. of Traffic Sci. and Eng. Huazhong Univ. of Sci. and Technol. Wuhan 430074 China

Present paper researches the theoretical method for calculating the wave resistance of wave-piercing catamaran. As an example the wave resistance of a wave-piercing catamaran is calculated. The comparison among the theoretical calculation results, the model test results and the graphic evaluation results shows the efficiency.of present theoretical method. Finally.the wave resistance regulation of wave-piercing catamarans is investigated based on the theoretical method.

关键词： Ships

Frequency.domain L2-stability.conditions for time-vary.ng linear and nonlinear MIMO sy.tems

在线全文

学校读者我要写书评

暂无评论

Control Theory.and Technology 2014年第1期12卷 13-34页

作者： Zhihong huang y. V. VENKATESH Cheng XIANG Tong Heng LEE Department of Electrical & Computer Engineering National University of Singapore Singapore

The paper deals with the g2-stability.analy.is of multi-input-multi-output （MIMO） sy.tems, governed by.integral equations, with a matrix of periodic/aperiodic time-vary.ng gains and a vector of monotone, non-monotone and quasi-monotone nonlin- earities. For nonlinear MIMO sy.tems that are described by.differential equations, most of the literature on stability.is based on an application of quadratic forms as Ly.punov-function candidates. In contrast, a non-Ly.punov framework is employ.d here to derive new and more general g2-stability.conditions in the frequency.domain. These conditions have the following features： i） They.are expressed in terms of the positive definiteness of the real part of matrices involving the transfer function of the linear time-invariant block and a matrix multiplier function that incorporates the minimax properties of the time-vary.ng linear/nonlinear block, ii） For certain cases of the periodic time-vary.ng gain, they.contain, depending on the multiplier function chosen, no restrictions on the normalized rate of variation of the time-vary.ng gain, but, for other periodic/aperiodic time-vary.ng gains, they.do. Overall, even when specialized to periodic-coefficient linear and nonlinear MIMO sy.tems, the stability.conditions are distinct from and less restrictive than recent results in the literature. No comparable results exist in the literature for aperiodic time-vary.ng gains. Furthermore, some new stability.results concerning the dwell-time problem and time-vary.ng gain switching in linear and nonlinear MIMO sy.tems with periodic/aperiodic matrix gains are also presented. Examples are given to illustrate a few of the stability.theorems.

关键词： Circle criterion K-P-y.lemma L2-stability Lur'e problem Multiplier function Ny.uist's criterion Switched sy.tems Time-vary.ng sy.tem