检索结果-南通市图书馆

Effect of β-Cyclodextrin Upon the Sol-gel Transition of Methylcellulose Solutions in the Presence of Sodium Dodecyl Sulfate

引用

Chinese Journal of Chemical Physics 2012年第2期25卷 242-248,I0004页

作者： Hua-yu Li Xiang Hao yong-jun xie Hai-yang Yang He Liu Jian-hui Luo Department of Polymer Science and Engineering University of Science and Technology of ChinaHefei 230026China Research Institute of Science and Technology China National Petroleum CorporationBeijing 100083China

The sol-gel transition temperature of methylcellulose （MC） solution in the presence of sodium dodecyl sulfate （SDS） as well as the mixtures of SDS and β-cyclodextrin （β-CD） was mea- sured, and the effect of the two competing interactions, the hydrophobic interaction between SDS and MC and the inclusion interaction between SDS and β-CD, upon the sol-gel transition of MC solution was studied. It has been found that the inclusion interaction between SDS and β-CD is much greater than the hydrophobic interaction between SDS and MC. As a result, in the coexistence of SDS and β-CD, the sol-gel transition temperature of MC solution keeps the same value, independent of the concentration of SDS in solution on con- dition that the concentration of SDS is less than β-CD. Our experimental results not only suggest that the effect of SDS upon the sol-gel transition of MC solution can be screened by β-CD completely but also indicate the inclusion ratio of SDS to β-CD can be determined quantitatively by using rheological measurement. The inclusion ratio of SDS to β-CD is 1：1, which is in good agreement with the inclusion ratio of SDS to β-CD in the presence of poly（vincyl pyrrolidone） determined by the viscosity measurement but is critically different from the inclusion ratio of SDS to β-CD in the presence of the oppositely charged polyelec-trolyte by using the rheological measurement, mainly due to the reason that the mechanism of the interaction between SDS and MC is critically different from the mechanism of the interaction between SDS and the oppositely charged polyelectrolyte.

关键词： Methylcellulose Sodium dodecyl sulfate β-CD Sol-gel transition Inclusion interaction

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

Let the Invisible be Visible and the Unheard be Heard--Public Art and Social Action

引用

Journal of Literature and Art Studies 2021年第9期11卷 720-726页

作者： xie yong the School of Fine Arts of ShenYang University ShenYangChina

Through public arts and my artistic practice to explore how art practice actively contributes to raising civic awareness around issues of social concern in contemporary China.I argue for their contribution to the field of public sculpture in *** case studies will unpack the research process and highlight the aspects of the work that challenge conventions in public sculpture in *** will also draw out the impact of the work with audiences,particularly how media engagement has extended the discourse around the sculptures,disseminating that art can be a powerful vehicle to communicate and interact with the public on subjects that are difficult and complex in *** aim,is at a minimum,to raise social awareness and spark debate in as wide an audience as *** I would want to see the artworks impact on social change and contribute meaningfully to creating a respectful society.

关键词： public arts social concern civic awareness interact

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

分数阶FitzHugh-Nagumo模型神经元的动力学特性及其同步

引用

物理学报 2010年第3期59卷 2147-2155页

作者：刘勇谢勇西安交通大学航天航空学院强度与振动教育部重点实验室西安710049

通过对分数阶FitzHugh-Nagumo模型神经元的研究,当外加电流强度作为分岔参数时,发现这种模型神经元从静息态到周期放电态所经历的Hopf分岔点不同于相应的整数阶模型神经元的分岔点;而且分数阶FitzHugh-Nagumo模型神经元呈现周期放电的... 详细信息

通过对分数阶FitzHugh-Nagumo模型神经元的研究,当外加电流强度作为分岔参数时,发现这种模型神经元从静息态到周期放电态所经历的Hopf分岔点不同于相应的整数阶模型神经元的分岔点;而且分数阶FitzHugh-Nagumo模型神经元呈现周期放电的外加电流强度的范围比相应的整数阶模型神经元的范围小,然而放电频率却比相应的整数阶模型神经元的放电频率高.同时还揭示在周期放电的情况下分数阶FitzHugh-Nagumo模型神经元之间的同步速率比相应的整数阶模型神经元之间的同步速率快.在数值模拟分数阶微分方程时,采用了精度高、速度快的Adomian分解算法.

关键词：分数阶 Hopf分岔 FitzHugh-Nagumo模型同步

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 microscopic pore structures on ultrasonic velocity in tight sandstone with different fluid saturation

引用

Petroleum Science 2022年第6期19卷 2683-2694页

作者： Jian-yong xie Jun-Jie Zhang Wei Xiang Yan-Ping Fang Ya-Juan Xue Jun-Xing Cao Ren-Fei Tian State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology(CDUT)Geophysical InstituteChengduSichuan610059China Oilfield Technology Division China National Offshore Oilfield Services Co.ZhanjiangGuangdong524000China School of Communication Engineering Chengdu University of Information TechnologyChengduSichuan610225China State Key Laboratory of Natural Gas Hydrate Beijing100028China

Microcosmic details of pore structure are the essential factors affecting the elastic properties of tight sandstone reservoirs,while the relationships in between are still incompletely clear due to the fact that quantitative or semi-quantitative experiments are hard to ***,three sets of tight sandstone samples from the Junggar Basin are selected elaborately based on casting thin sections,XRD detection,and petro-physical measurement,and each set is characterized by a single varied microcosmic factor(pore connectedness,pore type,and grain size)of the pore *** ultrasonic pulse transmission technique is conducted to study the response of elastic properties to the varied microcosmic details of pore structure in the situation of different pore fluid(gas,brine,and oil)saturation and confining *** show samples with less connectedness,inter-granular dominant pores,and smaller grain size showed greater velocities in normal *** more sensitive to the variations of pore type,while Vsis more sensitive to the variations of grain *** with better connectedness at fluid saturation(oil or brine)show greater sensitivity to the confining pressure than those with gas saturation with a growth rate of 6.9%-11.9%,and the sensitivity is more likely controlled by *** pore types(inter-granular or intra-granular)can be distinguished by the sensitivity of velocities to the variation of pore fluid at high confining pressure(>60 MPa).The samples with small grain sizes tend to be more sensitive to the variations of confining *** this knowledge,we can semi-quantitatively distinguish the complex pore structures with different fluids by the variation of elastic properties,which can help improve the precision of seismic reservoir prediction for tight sandstone reservoirs.

关键词： Tight sandstone Pore structure Casting thin section Ultrasonic measurement

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

Synergistic regulation of temperature resistance and thermal insulation performance of zirconia-based ceramic fibers

引用

Rare Metals 2023年第12期42卷 4189-4200页

作者： yong-Shuai xie Ying Peng Zhe-Zhe Deng Ze Zhu Yuan Cheng De-Hua Ma Lu-Yi Zhu Xing-Hong Zhang State Key Laboratory of Crystal Materials School of Crystal MaterialsShandong UniversityJinan 250100China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China

ZrO_(2) fiber is a promising high-temperature resistant and heat-insulating fiber ***,the decrease in mechanical properties caused by grain growth at high temperatures seriously affects its *** to achieve the synergy of its temperature resistance and the thermal insulation performance is still the focus of the current *** this work,we started with doping inequivalent elements and studied the phase composition,temperature resistance,and thermal insulation properties of Y_(2)O_(3)-ZrO_(2) ceramic fibers by adjusting the Y/Zr molar *** results showed that Y_(2)O_(3) could enter the crystal lattice of ZrO_(2) and form a solid *** the increase in Y_(2)O_(3) content,the structure of fibers changed from a tetragonal phase to a cubic phase,and the configurational entropy of the system *** larger configuration entropy in the sample could produce a robust steric hindrance effect,inhibiting grain *** heat treatment at 1300℃,the grain size of Y_(2)Zr_(2)O_(7)(Y5Z5)fibers was only 61.8%that of Y_(0.1)Zr_(0.9)O_(1.95)(Y1Z9)*** smaller grain size made the Y5Z5 fibers still have excellent flexibility and deformation recovery performance after heat treatment at 1300℃and could still return to the original state after 85%compression or folded in *** addition,due to the larger configurational entropy,the mean free path of phonon scattering was shortened,thereby improving the thermal insulation performance of the *** short,this work achieves the synergistic effect of temperature resistance and thermal insulation properties of zirconia-based fiber materials only through simple inequivalent element doping.

关键词： Ceramics fiber ZrO_(2) Y_(2)O_(3) Thermal insulation Temperature resistance

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

Quantitative characterizations of anisotropic dynamic properties in organic-rich shale with different kerogen content

引用

Petroleum Science 2024年第2期21卷 855-865页

作者： Jian-yong xie Yan-Ping Fang Xing-Hua Wu Jian'er Zhao Jun-Cheng Dai Jun-Xing Cao Ji-Xin Deng State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu610059SichuanChina Key Lab of Earth Exploration&Information Techniques of Ministry of Education Geophysical InstituteChengdu University of TechnologyChengdu610059SichuanChina PetroChina Southwest Oil&Gasfield Company Chengdu610017SichuanChina

Understanding the quantitative responses of anisotropic dynamic properties in organic-rich shale with different kerogen content(KC)is of great significance in hydrocarbon exploration and *** controlled experiments with a single variable is challenging for natural shales due to their high variations in components,diagenesis conditions,or pore *** employed the hot-pressing technique to construct 11 well-controlled artificial shale with varying *** artificial shale samples were successive machined into prismatic shape for ultrasonic measurements along different *** revealed bedding perpendicular P-wave velocities are more sensitive to the increasing KC than bedding paralleling velocities due to the preferential alignments of *** elastic stiffnesses except C_(13)are generally decreasing with the increasing KC,the variation of C_(1) and C_(33)on kerogen content are more sensitive than those of C_(44)and C_(66).Apparent dynamic mechanical parameters(v and E)were found to have linear correlation with the true ones from complete anisotropic equations independent of KC,which hold value towards the interpretation of well logs consistently across formations,Anisotropic mechanical parameters(ΔE and brittlenessΔB)tend to decrease with the reducing KC,withΔB showing great sensitivity to KC *** the range of low KC(10%)shale,compilation of data from natural organic rich-shales globally verified the similar systematic relationships that can be empirically used to predict the fraction of KC in shales.

关键词： Elastic properties Organic shale Anisotropy Kerogen content Physical modeling

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 Kind of Boundary Value Problem for Hypermonogenic Function Vectors

引用

Journal of Mathematical Research and Exposition 2011年第3期31卷 490-496页

作者： He Ju YANG yong Hong xie Yu Ying QIAO College of Mathematics and Information Science tlebei Normal University Hebei 050016 P. R. China College of Science Hebei University of Science and Technology Hebei 050018 P. R. China

By the Plemelj formula and the compressed fixed point theorem,this paper discusses a kind of boundary value problem for hypermonogenic function vectors in Clifford *** the paper proves the existence and uniqueness of ... 详细信息

关键词： Clifford analysis hypermonogenic function vector boundary value problem.

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

Solvent-free fabrication of broadband WS2 photodetectors on paper

引用

Opto-Electronic Advances 2023年第3期6卷 1-11页

作者： Wenliang Zhang Onur Çakıroğlu Abdullah Al-Enizi Ayman Nafady Xuetao Gan Xiaohua Ma Sruthi Kuriakose yong xie Andres Castellanos-Gomez Materials Science Factory Instituto de Ciencia de Materiales de Madrid(ICMM-CSIC)Madrid E-28049Spain Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Key Laboratory of Light Field Manipulation and Information Acquisition Ministry of Industry and Information Technologyand Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710129China School of Advanced Materials and Nanotechnology Xidian UniversityXi’an 710071China

Paper-based devices have attracted extensive attention due to the growing demand for disposable flexible ***,we integrate semiconducting devices on cellulose paper substrate through a simple abrasion technique that yields high-performance photodetectors.A solvent-free WS_(2) film deposited on paper favors an effective electron-hole separation and hampers *** as-prepared paper-based WS2 photodetectors exhibit a sensitive photoresponse over a wide spectral range spanning from ultraviolet(365 nm)to near-infrared(940 nm).Their responsivity value reaches up to~270 mA W^(−1) at 35 V under a power density of 35 mW cm^(−2).A high performance photodetector was achieved by controlling the environmental exposure as the ambient oxygen molecules were found to decrease the photoresponse and stability of the WS_(2) ***,we have built a spectrometer using such a paperbased WS_(2) device as the photodetecting component to illustrate its potential *** present work could promote the development of cost-effective disposable photodetection devices.

关键词： paper electronics photodetector van der Waals materials solvent-free deposition tungsten disulfide

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,HELICITY,AND BIOLOGICAL PROPERTIES OF MONOSACCHARIDE-CONTAININGPOLY(PHENYLACETYLENE)S

引用

Chinese Journal of Polymer Science 2007年第2期25卷 119-122页

作者： Jacky W. Y. Lam Kevin K. L. Cheuk Bing-shi Li yong xie Ben-zhong Tang Department of Chemistry The Hong Kong University of Science ＆ Technology Clear Water Bay Kowloon Hong Kong China Department of Biology The Hong Kong University of Science ＆ Technology Clear Water Bay Kowloon Hong Kong China Department of Polymer Science ＆ Engineering Zhejiang University Hangzhou 310027 China

Poly（phenylacetylene）s beating monosaccharide pendant groups are synthesized in high yields by [Rh（nbd）Cl]2 catalyst. The polymers have high molecular weights and give satisfactory spectroscopic data corresponding to their molecular structures. They are thermally quite stable （≥ 300℃） and show strong circular dichroism signals in the visible spectral region owing to the helicity of the polyene backbone. The monosaccharide-containing polyacetylenes are cytophilic and can stimulate the growth of living cells.

关键词： Biocompatibility Biomimetic Helicity Monosaccharides Polyacetylenes Sugars.

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

火龙果连作土壤细菌多样性与酶活性对酚酸类代谢产物的响应特征

引用

农业生物技术学报 2025年第1期33卷 30-42页

作者：谢勇俊秦文连周婧王孟佳潘小卓秦孝杰唐景美王一兵广西民族大学海洋与生物技术学院/广西多糖材料与改性重点实验室广西南亚热带农业科学研究所

随着火龙果(Hylocereus undatus)种植年限的增加，酚酸类代谢产物会逐渐在土壤中积累，引起土壤病原细菌、真菌及线虫等定殖，最终导致连作障碍的发生。本研究采用纯培养技术，从连作6年和3年的火龙果根际土壤中分离出可培养细菌，并通... 详细信息

随着火龙果(Hylocereus undatus)种植年限的增加，酚酸类代谢产物会逐渐在土壤中积累，引起土壤病原细菌、真菌及线虫等定殖，最终导致连作障碍的发生。本研究采用纯培养技术，从连作6年和3年的火龙果根际土壤中分离出可培养细菌，并通过16S r RNA基因序列进行种属鉴定。同时，采用土壤酶活性测定法研究不同种植年限火龙果土壤的酶活变化，利用高效液相色谱法(high performance liquid chromatography, HPLC)测定土壤中酚酸类代谢产物的种类及含量，分析土壤细菌与酶活性对酚酸类代谢产物的响应关系。结果显示，连作使火龙果中的细菌群落多样性增加，从火龙果的根际土壤中分离出4门、5纲、10目、16科、21属、56种共112株细菌，其中假单胞菌属(Pseudomonas)、伯克霍尔德菌属(Burkholderia)和芽胞杆菌属(Bacillus)等生防菌的相对丰度下降了23.36%。火龙果的连作种植导致土壤中过氧化氢酶和纤维素酶活性下降，脲酶和蔗糖酶活性上升。连作导致没食子酸、阿魏酸、水杨酸和苯甲酸的含量分别增加了163.80%、194.92%、341.57%和175.93%。响应关系分析显示，酚酸与微生物群落结构之间具有一定的关联性。上述结果表明，连作种植导致没食子酸、阿魏酸、水杨酸和苯甲酸等酚酸物质积累，引起了土壤微生物群落结构的失衡，有益微生物减少，土壤酶活力发生改变，植物营养物质的吸收受到影响，最终导致连作障碍的产生。本研究为后续开发具有降解酚酸功能的微生物菌剂及火龙果的田间管理技术提供基础数据。

关键词：火龙果连作障碍酚酸土壤酶活性土壤微生物

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

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

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

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：