检索结果-南通市图书馆

Magnesium hydroxide whisker modified via in situ copolymerization of n-butyl acrylate and maleic anhydride

Rare Metals 2017年第12期36卷 997-1002页

作者： Yu-Zhi Jiang Yu-lian Wang Chun-yan Wang li-Mei Bai Xin li yan-bo li Collogy of Materials Science and Engineering Shenyang Ligong University Shenyang 110159 China Kailong Lanfeng New Material Technology Co. LtdZhenjiang 212132 China College of Mining Engineering Hebei United UniversityTangshan 063009 China School of Materials Science and Engineering Central South University Changsha 410083 China

Magnesium hydroxide(MH) whiskers were modified via in situ polymerization of n-butyl acrylate and maleic anhydride. Sodium dodecyl sulfonate was used as emulsifier. The modifying effect was evaluated by using contact angle and activation index. The thermal stability,functional groups, structure, morphology, phase composition and surface element valence of MH whiskers were characterized by thermogravimetry-differential scanning calorimetry(TG-DSC), Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD), scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS). Results reveal that the contact angle and activation index of modified MH whiskers are 105°and 76.5%, the thermal stability shows little change, and the decomposition temperature ranges between 38 and419 ℃. The copolymer of n-butyl acrylate and maleic anhydride absorbed on the surface of MH whiskers leads to the increased diameter and makes the surface of whiskers be rougher. Furthermore, the absorption of element C on the surface of MH whiskers increases, and the diffraction intensity of C 1 s spectra increases; thus, the compatibility of whiskers in the organic phase can be improved significantly. Lastly, the surface molecular model of MH whiskers modified via in situ copolymerization of n-butyl acrylate and maleic anhydride is established.

关键词： Magnesium hydroxide whiskers n-Butyl acrylate Maleic anhydride In situ copolymerization Surface molecular model

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

Perovskite Single Crystals: Synthesis, Properties, and Applications

引用

Journal of Electronic Science and Technology 2021年第2期19卷 119-143页

作者： Shan-Shan Rong M.Bilal Faheem yan-bo li Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054

Perovskite single crystals have gained enormous attention in recent years due to their facile synthesis and excellent optoelectronic properties including the long carrier diffusion length,high carrier mobility,low trap density,and tunable absorption edge ranging from ultra-violet(UV)to near-infrared(NIR),which offer potential for applications in solar cells,photodetectors(PDs),lasers,*** this review,we summarized the synthesis,properties,and applications of organic-inorganic mixed and all-inorganic perovskite single crystals,particularly those through the solution synthesis *** towards the crystal growth and stability with future perspectives were also briefly described at the end of this paper.

关键词： Laser perovskite photodetector(PD) single crystal solar cell

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

Preheat Compression Molding for Polyetherketoneketone: Effect of Molecular Mobility

引用

Chinese Journal of Polymer Science 2022年第2期40卷 175-184页

作者： Xiao-Hua Zhang Meng-Xiao Jiao Xin Wang bo-Lan li Feng Zhang yan-bo li Jing-Na Zhao He-Hua Jin Yu yang Key Laboratory of Textile Science&Technology(Ministry of Education) College of Textilesand Innovation Center for Textile Science and TechnologyDonghua UniversityShanghai201620China Advanced Materials Division Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Key Laboratory of Carbon Materials National Engineering Laboratory for Carbon Fiber TechnologyInstitute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China

Polyetherketoneketone(PEKK)is a new evolving polymeric material,and is considered as another important member of the polyaryletherketone(PAEK)family in addition to polyetheretherketone(PEEK).Hot compression molding can be used to compact and consolidate the PEKK products,where the temperature and pressure play key roles to affect the molecular mobility,entanglement and crystallization,and thus the mechanical properties of *** this study,a preheating treatment was introduced in the compression molding,and it is found that such preheating is very essential to avoid the formation of crystal FormⅡ,based on the increased chain *** dynamics simulations revealed that the molecular mobility is always suppressed when a compression is ***,by increasing the entanglement via the preheating and maintaining such entanglement in the consequent compression molding,strong and tough PEKK materials were obtained,with a negligible fraction of crystal FormⅡ.

关键词： Polyetherketoneketone Molecular mobility Compression molding Mechanical properties

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

Evaluation of standard liver volume formulae for Chinese adults

引用

World Journal of Gastroenterology 2009年第32期15卷 4062-4066页

作者： Zheng-Rong Shi Lu-Nan yan bo li Tian-Fu Wen liver Transplantation Division Department of Surgery West China Hospital Sichuan University Chengdu 610041 Sichuan Province China

AIM:To evaluate different standard liver volume (SLV) formula and verify the applicability of the formulae for Chinese ***: Data from 70 cases of living donor liver transplantation (LDLT) performed at our transplantation centers between January 2008 and April 2009 were analyzed. SLV was estimated using our recently reported formula [the Chengdu formula: SLV (mL)=11.5×body weight (kg) + 334] and other reported formulae used for Chinese adults. Actual intraoperative liver volumes were obtained from a review of the patients' medical ***: The actual right liver volume was not significantly different from the estimated right liver volume determined by the Chengdu formula, but was significantly smaller than estimates using the Heinemann, Urata, Vauthey, and Lee formulae (Pliable by its application in LDLT.

关键词： Standard liver volume living donor livertransplantation Chinese adult liver volume formula

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

Copper(Ⅰ)-catalyzed diastereodivergent construction of vicinal P-chiral and C-chiral centers facilitated by dual“soft-soft”interaction

引用

Chinese Chemical Letters 2024年第7期35卷 264-270页

作者： yan-bo li Yi li liang Yin CAS Key Laboratory of Synthetic Chemistry of Natural Substances Centre for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200032China

A copper(Ⅰ)-catalyzed diastereodivergent addition of phosphinothioates(HP(S)ROR')toα,β-unsaturated thioamides is disclosed,which constructs vicinal P-chiral and C-chiral centers in generally high diastereoand *** this reaction,the kinetic resolution of HP(S)ROR'occurs,which affords(R)-HP(S)Ph OMe in high enantioselectivity in the addition with(R,R)-Ph-BPE as the *** is found through control experiment that dual“soft-soft”interaction,indicated by both1H and31P NMR experiments,is indispensable in the present *** first“soft-soft”interaction between copper(Ⅰ)catalyst and HP(S)ROR'enables facile deprotonation to generate nucleophilic[Cu]-SPROR'*** second one between the[Cu]-SPROR'species andα,β-unsaturated thioamides facilitated the nucleophilic ***,both Michael adducts and(R)-HP(S)PhOMe are easily converted to synthetically useful compounds.

关键词： Copper catalysis Asymmetric catalysis Diastereodivergent synthesis P-Chirality "Soft-soft"interaction

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

High-Temperature Oxidation Behavior of Vanadium,Titanium-Bearing Magnetite Pellet

引用

Journal of Iron and Steel Research International 2011年第8期18卷 14-19页

作者： HAN Gui-hong JIANG Tao ZHANG Yuan-bo HUANG yan-fang li Guang-hui School of Minerals Processing and Bioengineering Central South University Changsha 410083 Hunan China

By means of isothermal oxidation and chemical analysis, great importance was attached to the parameters that made effects on the oxidation degree of vanadium, titanium-bearing magnetite pellet in high-temperature processing （1 073- 1 323 K）. Based on the experimental data, oxidation kinetics of pellet was analyzed according to shrinking unreacted-core model subsequently. Experiment results display that the oxidation degree of pellet increases with increasing of oxidation time, oxidation temperature and oxygen content, as well as shrinking of pellet diameter. Under the condition of oxidation time 20 min, oxidation temperature 1223 K, oxygen content 15%, and pellet diameter 12 mm, oxidation degree of pellet reaches 92.92%. The analysis of oxidation kinetics indicates that oxidation process of pellet is controlled by chemical reaction with activation energy 68.64 kJ/mol at a relatively lower temperature （1073-1 173 K）. Oxidation process of pellet is mixed-controlled by chemistry reaction and diffusion with activation energy 39.66 kJ/mol in the temperature range of 1 173-1 273 K. When oxidation temperature is higher than 1 273 K, the limited link of oxidation reaction is the diffusion control with the activation energy 20.85 kJ/mol. These results can serve as a reference to the production of vanadium, titanium-hearing magnetite pellet.

关键词： vanadium titanium-bearing magnetite oxidation degree pellet shrinking unreaeted-core model oxidation kinetics

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

Plasma-Enhanced Atomic Layer Deposition of Amorphous Ga_(2)O_(3) for Solar-Blind Photodetection

引用

Journal of Electronic Science and Technology 2022年第4期20卷 331-344页

作者： Ze-Yu Fan Min-Ji yang bo-Yu Fan Andraz Mavric Nadiia Pastukhova Matjaz Valant bo-lin li Kuang Feng Dong-liang liu Guang-Wei Deng Qiang Zhou yan-bo li Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054 Materials Research Laboratory University of Nova GoricaNova Gorica SI-5000 yangtza Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001

Wide-bandgap gallium oxide(Ga_(2)O_(3))is one of the most promising semiconductor materials for solar-blind(200 nm to 280 nm)*** its amorphous form,amorphous gallium oxide(a-Ga_(2)O_(3))maintains its intrinsic optoelectronic properties while can be prepared at a low growth temperature,thus it is compatible with Si integrated circuits(ICs)***,the a-Ga_(2)O_(3) film is directly deposited on pre-fabricated Au interdigital electrodes by plasma enhanced atomic layer deposition(PE-ALD)at a growth temperature of 250°*** stoichiometric a-Ga_(2)O_(3) thin film with a low defect density is achieved owing to the mild PE-ALD *** a result,the fabricated Au/a-Ga_(2)O_(3)/Au photodetector shows a fast time response,high responsivity,and excellent wavelength selectivity for solar-blind ***,an ultra-thin MgO layer is deposited by PE-ALD to passivate the Au/a-Ga_(2)O_(3)/Au interface,resulting in the responsivity of 788 A/W(under 254 nm at 10 V),a 250-nm-to-400-nm rejection ratio of 9.2×10^(3),and the rise time and the decay time of 32 ms and 6 ms,*** results demonstrate that the a-Ga_(2)O_(3) film grown by PE-ALD is a promising candidate for high-performance solar-blind photodetection and potentially can be integrated with Si ICs for commercial production.

关键词： Amorphous gallium oxide(a-Ga_(2)O_(3)) passivation layer plasma enhanced atomic layer deposition(PE-ALD) responsivity solar-blind photodetector

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

Visceral response to acute retrograde gastric electrical stimulation in healthy human

引用

World Journal of Gastroenterology 2005年第29期11卷 4541-4546页

作者： Shu-Kun Yao Mei-Yun Ke Zhi-Feng Wang Da-bo Xu yan-li Zhang Department of Gastroenterology Peking Union Medical College Hospital Beijing 100730 China

AIM: To investigate the visceral response to acute retrograde gastric electrical stimulation (RGES) in healthy humans and to derive optimal parameters for treatment of patients with ***: RGES with a series of effective parameters were performed via a bipolar mucosal electrode implanted along the great curvature 5 cm above pylorus of stomach in 12 healthy human subjects. Symptoms associated with dyspepsia and other discomfort were observed and graded during RGES at different settings, including long pulse and pulse train. Gastric myoelectrical activity at baseline and during different settings of stimulation was recorded by a multi-channel ***: The gastric slow wave was entrained in all the subjects at the pacing parameter of 9 cpm in frequency, 500 ms in pulse width, and 5 mA in *** frequently appeared symptoms during stimulation were satiety, bloating, discomfort, pain, sting, and nausea. The total symptom score for each subject significantly increased as the amplitude or pulse width was adjusted to a higher scale in both long pulse and pulse train. There was a wide diversity of visceral responses to RGES among ***: Acute RGES can result in a series of symptoms associated with dyspepsia, which is beneficial to the treatment of obesity. Optimal parameter should be determined according to the individual sensitivity to electrical stimulation.

关键词： Visceral response Retrograde gastric electrical stimulation Symptom Obesity

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

Perfect invisibility concentrator with simplified material parameters

引用

Frontiers of physics 2018年第5期13卷 3-8页

作者： Meng-Yin Zhou lin Xu Lu-Chan Zhang Jiang Wu yan-bo li Huan-yang Chen Institute of Electromagnetics and Acoustics and Department of Electronic Science Xiamen University Xiamen 361005 China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 610054 China

We present a series of invisibility concentrators with simplified material parameters beyond trans- formation optics. One of them can achieve the perfect invisible effect at frequencies of Fabry-Perot resonances, while others have very small scattering. The required materials are feasible in practice. Analytical calculations and numerical simulations confirm the functionalities of these devices.

关键词： perfect-invisibility concentrator simplified material parameters Fabry-Perot resonances scattering cross section

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

Concrescence of maxillary second molar and impacted third molar:A case report

引用

World Journal of Clinical Cases 2022年第28期10卷 10286-10292页

作者： Jun Su li-Mei Shao lian-Cheng Wang li-Jia He Ya-liu Pu yan-bo li Wen-Yun Zhang Department of Stomatology 920th Hospital of the Joint Logistics Support ForceKunming 650032Yunnan ProvinceChina

BACKGROUND Morphological anomalies of teeth,including talon cusp,dens evaginatus,gemination,fusion,concrescence,root dilaceration,and taurodontism,always involve changes in the enamel,cementum and *** concrescent teeth through routine clinical examination alone is difficult,and most cases of concrescence are found accidentally during extraction.A definite preoperative diagnosis of concrescence would contribute to a better treatment plan and fewer undesirable complications CASE SUMMARY A 47-year-old woman who complained of left maxillary first molar loss for half a year presented to our department seeking treatment by dental implant *** radiography and cone-beam computed tomography(CBCT)showed an unclear boundary between the distal root of the second molar and the mesial root of the third *** teeth were extracted under local anesthesia,and a definite diagnosis of concrescence was made by histopathological *** CBCT is a useful tool for diagnosing and planning the management of tooth concrescence and may be beneficial for reducing unnecessary complications.

关键词： Concrescence Impacted tooth Concentrate growth factor Maxillary third molar Tooth anomalies Cone-beam computed tomography Case report

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

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：