检索结果-南通市图书馆

Heat transfer characteristics in micro-fin tube equipped with double twisted tapes: Effect of twisted tape and micro-fin tube arrangements

引用

Journal of Hydrodynamics 2013年第2期25卷 205-214页

作者： EIAMsA-ArD s. WONGCHArEE K. Department of Mechanical Engineering Faculty of Engineering Mahanakorn University of Technology Department of Chemical Engineering Faculty of Engineering Mahanakorn University of Technology

An experimental study was carried out to investigate the influence of double twisted-tape inserts （DTs） in micro-fin tubes （MFs） on heat transfer, friction factor and thermal performance factor characteristics of the compound devices in the following configurations：（1） twisted tapes acted in the same direction （for co-swirl） while MF and twisted tapes acted in the same （parallel） direction （MF-CoDTs：P）, （2） twisted tapes acted in the same direction （for co-swirl） while micro-fin tube and twisted tapes acted in opposite directions （MF-CoDTs：O） and （3） twisted tapes acted in opposite directions for counter swirl （MF-CDTs）. The MF alone and the MF equipped with a single twisted tape in parallel/opposite arrangement were also considered for comparison. The experiments were conducted for the flows with the reynolds numbers between 5 650 and 17 000, under uniform heat flux condition. The experimental results indicate that MF-CDTs induce stronger swirl/turbulence flow, resulting in higher heat transfer rate, friction factor and thermal performance factor than other combined devices. The thermal performance factors associated with the use of MF-CDTs were found to be higher than those associated with the uses of MF-CoDTs：P, MF-CoDTs：O and MF alone up to 9.3%, 6.5% and 56.4%, respectively. The empirical correlations developed using the present experimental data for the Nusselt number, friction factor and thermal performance factor are also reported.

关键词： micro-fin tube (MF) double twisted-tapes (DTs) co-swirl counter-swirl heat transfer enhancement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The adsorption and corrosion inhibition of 8-hydroxy-7-quinolinecarboxaldehyde derivatives on C-steel surface in hydrochloric acid

引用

Chinese Journal of Chemical Engineering 2017年第9期25卷 1256-1265页

作者： A.M.Eldesoky s.G.Nozha Engineering Chemistry Department High Institute of Engineering & Technology Al-Qunfudah Center for scientific research (QCsr) Al-Qunfudah University College Umm Al-Qura University Ministry of Health Domyat Laboratory

The protection influence of 8-hydroxy-7-quinolinecarboxaldehyde derivatives against C-steel corrosion was studied in 2 mol·L^(-1)HCl solutions at 30 °C. Measurements were conducted under various experimental conditions using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy(EIs) and electrochemical frequency modulation(EFM) techniques. These studies have shown that 8-hydroxy-7-quinolinecarboxaldehyde derivatives are very good "green", mixed-type inhibitors. Corrosion rates obtained from both EFM and EIs methods are comparable with those recorded using Tafel extrapolation method, confirming validation of corrosion rates measured by the latter. The inhibitive action of these 8-hydroxy-7-quinolinecarboxaldehyde derivatives was discussed in terms of blocking the electrode surface by adsorption of the molecules through the active centers contained in their structures following Langmuir adsorption isotherm. Quantum chemical method was also employed to explore the relationship between the inhibitor molecular properties and its protection efficiency.

关键词： 8-Hydroxy-7-quinolinecarboxaldehyde derivatives C-steel HCl EFM

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

(2s,3s,4r)-2-正戊基-3,4-二叠氮基四氢噻吩的合成

引用

高等学校化学学报 2002年第8期23卷 1520-1523页

作者：史鸿鑫林辉 Bloch r Mandville G 刘化章浙江工业大学化工学院杭州310014 浙江大学理学院化学系杭州310012 Universite de Paris-sud.ICMO

以 (+) -4,1 0 -二氧杂三环 [5 .2 .1 .O2 ,6 ]-癸 -8-烯 -3 -醇为原料 ,经 8步反应 ,对映选择性地合成出去氧维生素 H的重要中间体 :(2 s,3 s,4r) -2 -正戊基 -3 ,4-二叠氮基四氢噻吩 .为对映选择性合成手性四氢噻吩类化合物提供了新... 详细信息

以 (+) -4,1 0 -二氧杂三环 [5 .2 .1 .O2 ,6 ]-癸 -8-烯 -3 -醇为原料 ,经 8步反应 ,对映选择性地合成出去氧维生素 H的重要中间体 :(2 s,3 s,4r) -2 -正戊基 -3 ,4-二叠氮基四氢噻吩 .为对映选择性合成手性四氢噻吩类化合物提供了新的方法 .

关键词： (2s,3s,4r)-2-正戊基-3,4-二叠氮基四氢噻吩合成中间体去氧维生素H 对映选择性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of size and indium-composition on linear and nonlinear optical absorption of InGaN/GaN lens-shaped quantum dot

引用

Chinese Physics B 2016年第5期25卷 380-387页

作者： Ahmed s Jbara Zulkafli Othaman M A saeed Center for sustainable Nanomaterials Universiti Teknologi Malaysia Physics Department Science College Al-Muthanna University Department of Physics Faculty of Science Universiti Teknologi Malaysia

Based on the schr ¨odinger equation for envelope function in the effective mass approximation, linear and nonlinear optical absorption coefficients in a multi-subband lens quantum dot are investigated. The effects of quantum dot size on the interband and intraband transitions energy are also analyzed. The finite element method is used to calculate the eigenvalues and eigenfunctions. strain and In-mole-fraction effects are also studied, and the results reveal that with the decrease of the In-mole fraction, the amplitudes of linear and nonlinear absorption coefficients increase. The present computed results show that the absorption coefficients of transitions between the first excited states are stronger than those of the ground states. In addition, it has been found that the quantum dot size affects the amplitudes and peak positions of linear and nonlinear absorption coefficients while the incident optical intensity strongly affects the nonlinear absorption coefficients.

关键词： linear and nonlinear optical absorption coefficients lens quantum dot finite element method

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparative analysis of entanglement measures based on monogamy inequality

引用

Chinese Physics B 2017年第5期26卷 52-59页

作者： P J Geetha sudha K s Mallesh Department of Physics Kuvempu University Shankaraghatta Shimoga-577 451 India Inspire Institute Inc. Alexandria Virginia 22303 USA Department of studies in Physics University of Mysore Mysore-570 006 India

We evaluate the monogamy inequality for symmetric, non-symmetric pure states of importance in terms of squared concurrence, squared entanglement of formation, squared negativity of partial transpose and compare the corresponding tangles. We show that though concurrence and concurrence tangle are zero for two special classes of mixed entangled states, both negativity tangle and entanglement of formation（EOF） tangle turn out to be non-zero. A comparison of different tangles is carried out in each case and it is shown that while the concurrence tangle captures the genuine multiqubit entanglement in N-qubit pure states with N distinct spinors（containing GHZ and superposition of W-, obverse W states）either negativity tangle or EOF tangle is to be used as a better measure of entanglement in the W-class of states with two distinct spinors and in the special classes of mixed multiqubit states.

关键词： entanglement tangle negativity superposition inequality entangled symmetric vanishing squared arbitrary

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The neuroprotective and regenerative potential of parkin and GDNF/ret signaling in the midbrain dopaminergic system

引用

Neural regeneration research 2015年第11期10卷 1752-1753页

作者： Edgar r.Kramer Development and Maintenance of the Nervous system Center for Molecular Neurobiology University Medical Center Hamburg-Eppendorf

Parkinson＇s disease（PD）is the second most common neurodegenerative disease after Alzheimer＇s *** etiology of PD is still not completely understood,but the degeneration of dopaminergic（DA）neurons in the substantia nigra pars compacta（sNpc）,loss of DA innervation of the striatum,and protein aggregates in the form of Lewy bodies and neurites are its established hallmarks. In addition to α-synuclein accumu- lation in Lewy bodies and neurites, genetic mutations in the genes encoding parkin, PINK, DJ-1, LrrK2 and other proteins are associated with the inherited form of PD. An association study linked also the receptor tyrosine kinase ret to PD （Meka et al., 2015）. Currently there are only symptomatic treatments available for PD but no cure. Consequently much effort is being made to find neurotrophic and other factors able to stimulate sNpc DA neuron protection and regeneration.

关键词： GDNF The neuroprotective and regenerative potential of parkin and GDNF/ret signaling in the midbrain dopaminergic system

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comprehensive Application of Graphene: Emphasis on Biomedical Concerns

引用

Nano-Micro Letters 2019年第1期11卷 101-131页

作者： s.syama P.V.Mohanan Toxicology Division Biomedical Technology Wing Sree Chitra Tirunal Institute for Medical Sciences and Technology

Graphene, sp^2 hybridized carbon framework of one atom thickness, is reputed as the strongest material to date. It has marked its impact in manifold applications including electronics, sensors, composites, and catalysis. Current state-of-the-art graphene research revolves around its biomedical applications. The two-dimensional(2D) planar structure of graphene provides a large surface area for loading drugs/biomolecules and the possibility of conjugating fluorescent dyes for bioimaging. The high near-infrared absorbance makes graphene ideal for photothermal therapy. Henceforth, graphene turns out to be a reliable multifunctional material for use in diagnosis and treatment. It exhibits antibacterial property by directly interacting with the cell membrane. Potential application of graphene as a sca old for the attachment and proliferation of stem cells and neuronal cells is captivating in a tissue regeneration scenario. Fabrication of 2D graphene into a 3D structure is made possible with the help of 3D printing, a revolutionary technology having promising applications in tissue and organ engineering. However, apart from its advantageous application scope, use of graphene raises toxicity concerns. several reports have confirmed the potential toxicity of graphene and its derivatives, and the inconsistency may be due to the lack of standardized consensus protocols. The present review focuses on the hidden facts of graphene and its biomedical application, with special emphasis on drug delivery, biosensing, bioimaging, antibacterial, tissue engineering, and 3D printing applications.

关键词： Graphene Biomedical Bioprinting Toxicity Photothermal therapy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A model for the scattering of long waves by slotted breakwaters in the presence of currents

引用

Acta Mechanica sinica 2007年第1期23卷 1-9页

作者： Zhenhua Huang M. s. Ghidaoui Department of Civil Engineering The Hong Kong University of Science and Technology Clearwater Bay Kowloon Hong Kong China

slotted breakwaters have been used to provide economical protection from waves in harbors where surface waves and currents may co-exist. In this paper, the effects of currents on the wave scattering by slotted breakwaters are investigated by using a simple model. The model is based on a long wave approximation. The effects of wave height, barrier geometry and current strength on the reflection and transmission coefficients are examined by the model. The model results are compared with recent experimental data. It is found that both the wave-following and wave-opposing currents can increase the reflection coefficient and reduce the transmission coefficient. The model can be used to study the interaction between long waves and slotted breakwaters in coastal waters.

关键词： Wave scattering. Wave-structure interaction slotted breakwaters

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

synthesis of β-cyclodextrin functionalized gold nanoparticles for the selective detection of Pb2＋ ions from aqueous solution

引用

Frontiers of Materials science 2012年第2期6卷 168-175页

作者： B.AsWATHY G.s.AVADHANI s.sUJI G.sONY Department of Chemistry University of KeralaKariavattom CampusThiruvananthapuramKerala 691021India Department of Materials Engineering Indian Institute of ScienceBangaloreIndia

In the present study we carried out the synthesis of β-cyclodextrin （β-CD） functionalized gold nanoparticles （AuNPs） using a microwave assisted heating method in alkaline media. stable dispersion of β-CD stabilized AuNPs was obtained at an optimized pH of 10,5. At this pH value the deprotonated secondary hydroxyl group of β-CD shows the highest chelating affinity toward Pb2＋ ions thereby inducing AuNP aggregation. The Pb2＋ induced aggregation in β-CD-AuNP solution is monitored by both colorimetric response and UV-Vis spectroscopy. TEM, DLs and FTIr analyses were carried out to confirm the Pb2＋ ion induced aggregation behaviour of β-CD-AuNPs under alkaline conditions. Furthermore at the experimental pH the response of the β-CD-AuNP system towards Pb2＋ ions is selective when compared with other interfering metal cations.

关键词： gold nanoparticle (AuNP) β-cyclodextrin (β-CD) colorimetric detection,metal ion

来源：

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

高频放大器

高频放大器

引用

作者： r.s.·卡逊(r.s. Carson)

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：