检索结果-南通市图书馆

Recent Progress in Two-dimensional Nanomaterials Following Graphene for Improving Fire Safety of Polymer(Nano)composites

引用

Chinese Journal of Polymer Science 2021年第8期39卷 935-956,I0004页

作者： Wei Cai Bi-Bo wang xin wang Yu-Lu Zhu zhao-xin Li Zhou-Mei Xu Lei Song Wei-zhao Hua Yuan Hua State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230000China Suzhou Advanced Research Institute University of Science and Technology of ChinaSuzhou 215000China

The high fire safety of polymer nanocomposites is being pursued by research institutions around the *** addition to intrinsic flame retardancy strategy,the additive-type flame retardants have attracted increasing attention due to low commercial cost and easy fabrication ***,traditional additive-type flame retardants usually need high addition amount to achieve a desirable effect which causes many side-effects on the overall performance of polymer materials,such as deteriorated mechanical property and *** present two-dimensional(2D)nanomaterials have also been applied to reduce the fire hazards of polymer(nano)composites with the coupling of barrier function and catalysis as well as carbonization *** though most research work mainly focus on graphene-based flame retardants,more emerging two-dimensional nanomaterials are taking away research attention,due to their complementary and unique properties,mainly including hexagonal boron nitride(h-BN),molybdenum disulfide(MoS2),metal organic frameworks(MOF),carbon nitride(CN),titanium carbide(MXene)and black phosphorene(BP).In this review,except for graphene,the flame retardant mechanism involving different layered nanomaterials are also ***,the functionalization method and flame retardancy effect of different layered nanomaterials are emphatically discussed for offering an effective reference to solve the fire hazards of polymer ***,this work objectively evaluates the practical significance of polymer/layered nanomaterials composites for industrial application.

关键词： Polymer(nano)composites Layered nanomaterials Fire safety Flame retardant mechanism

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

Triboelectric nanogenerator with mechanical switch and clamp circuit for low ripple output

引用

Nano Research 2022年第3期15卷 2077-2082页

作者： xin Yu Zhenjie wang Da zhao Jianwei Ge Tinghai Cheng Zhong Lin wang School of Electrical and Electronic Engineering Changchun University of TechnologyJilin 130012China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China CUSTech Institute of Technology Zhejiang 325024China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332–0245USA

For new renewable clean energy,triboelectric nanogenerators(TENGs)have shown great potential in response to the world energy ***,the alternating-current signal generated by a TENG needs to be converted into a direct-current signal to be effective in ***,a power management circuit,comprising a clamp rectifier circuit and a mechanical switch,is proposed for the conversion and produces a signal having a low ripple *** power management circuit adopts a clamp circuit as the rectifier circuit to increase the rectified voltage,and reduces the loss resulted from the components by reducing the use of discrete components;the electronic switch in the buck regulator circuit is replaced with a mechanical switch to reduce cost and *** a series of experiments,this power management circuit displayed a stable output voltage with a ripple voltage of 0.07 V,crest factor of 1.01,and ripple coefficient of 2.2%.The TENG provides a feasible method to generate stable electric energy and to supply power to low-consumption electronic devices.

关键词： triboelectric nanogenerator low ripple coefficient clamp circuit mechanical switch energy harvesting

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

Preparation of Hierarchically Trimodal-Porous ZSM-5 Composites through Steam-assisted Conversion of Macroporous Aluminosilica Gel with Two Different Quaternary Ammonium Hydroxides

引用

China Petroleum Processing & Petrochemical Technology 2015年第1期17卷 48-58页

作者： zhao Tianbo wang Jia Xu xin wang Guijie School of Chemistry Beijing Institute of Technology China Coal Information Institute

This article presents a detailed structural study of a new spherical Mg Cl2-supported Ti Cl4 Ziegler-Natta catalyst for isotactic propylene polymerization, and researches on the relationship between catalyst structure and polymer properties. The spherical support with the chemical composition of CH3CH2 OMg OCH(CH2Cl)2 has been synthesized from a new dispersion system and is used as the supporting material to prepare Ziegler-Natta catalyst. The XRD analysis indicates that the catalyst is fully activated with δ-Mg Cl2 in the active catalyst. The far-IR spectrometric results confirm again the presence of δ-Mg Cl2 in the active catalyst. Textural property of the active catalyst exhibits high surface area coupled with high porosity. The high activity in propylene polymerization is mainly ascribed to the full activation and the porous structure of the catalyst. Scanning electron microscopy/energy dispersive spectrometer mapping results indicate a uniform titanium distribution throughout the catalyst particles. Particle size analysis shows that the catalyst has a narrow particle size distribution. The perfect spherical shape, uniform titanium distribution and narrow particle size distribution of the catalyst confirm the advantage of polymer particles production with less fines. The solid state 13 C NMR and mid-IR spectroscopic analyses indicate that there exists strong complexation between diisobutyl phthalate and Mg Cl2, which leads to the high isotacticity of polypropylene.

关键词： ZSM-5 composites hierarchically trimodal-porous steam-assisted conversion method macroporous aluminosilicagel quaternary ammonium hydroxide

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

Formation and transformation of metastable LPSO building blocks clusters in Mg-Gd-Y-Zn-Zr alloys by spinodal decomposition and heterogeneous nucleation

引用

Journal of Magnesium and Alloys 2024年第2期12卷 673-686页

作者： xin zhao Zhong Yang Jiachen Zhang Minxian Liang Liying wang School of Materials Science and Chemical Engineering Xi’an Technological UniversityXi’an 710021China Xi’an Tianli Metal Composite Material Co.Ltd. Xi’an 710299China

To study the formation and transformation mechanism of long-period stacked ordered(LPSO)structures,a systematic atomic scale analysis was conducted for the structural evolution of long-period stacked ordered(LPSO)structures in the Mg-Gd-Y-Zn-Zr alloy annealed at 300℃~500℃.Various types of metastable LPSO building block clusters were found to exist in alloy structures at different temperatures,which precipitate during the solidification and homogenization *** stability of Zn/Y clusters is explained by the first principles of density functional *** LPSO structure is distinguished by the arrangement of its different Zn/Y enriched LPSO structural units,which comprises local fcc stacking sequences upon a tightly packed *** presence of solute atoms causes local lattice distortion,thereby enabling the rearrangement of Mg atoms in the different configurations in the local lattice,and local HCP-FCC transitions occur between Mg and Zn atoms occupying the nearest neighbor *** finding indicates that LPSO structures can generate necessary Schockley partial dislocations on specific slip surfaces,providing direct evidence of the transition from 18R to *** of the LPSO,devoid of any defects and non-coherent interfaces,was observed separately from other precipitated *** a result,the precipitation sequence of LPSO in the solidification stage was as follows:Zn/Ycluster+Mg layers→various metastable LPSO building block clusters→18R/24R LPSO;whereas the precipitation sequence of LPSO during homogenization treatment was observed to be as follows:18R LPSO→various metastable LPSO building block clusters→14H *** these,14H LPSO was found to be the most thermodynamically stable structure.

关键词： LPSO Spinodal decomposition Homogenization treatment Clusters Phase transformation

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 CdS multipods from cadmium xanthate in ethylenediamine solution

引用

Particuology 2015年第2期13卷 45-52页

作者： Qiaofeng Han Jin zhao Lei Wu Junwu Zhu xin wang Key Laboratory for Soft Chemistry and Functional Materials Ministry of EducationNanjing University of Science and Technology

CdS nanocrystals of various shapes were synthesized by using cadmium ethyldithiocarbonatio （xanthate） as a single precursor under solvothermal condition. The reaction temperature, cadmium concentration, and solvents determine the CdS morphology. Multipodal CdS structures of different fractions of all particles were obtained at temperatures ranging from 100 to 180 ℃ with the corresponding precursor concentrations in ethylenediamine （EDA） solution. This approach is different from that reported in the literature, where EDA is regarded as a solvent favorable to the formation ofCdS nanorods instead of pods. Uniform CdS multipods were prepared at 160 ℃ with 1.0 g of cadmium xanthate. The formation of CdS multipods in EDA solution may be attributed to a synergistic effect between the reaction temperature and Cd concentration, i.e., thermodynamically and kinetically controlled growth of the CdS wurtzite （WZ） and zinc blende （ZB） phases, as confirmed by the structural characterization of the component CdS crys- tals. EDA and xanthate ligands act as co-assisted capping agents in the growth of CdS multipods. When using N,N-dimethylformamide （DMF） and ethylene glycol （EG） as solvents, the CdS appears as triangular particles and flower-like microspheres assembled by polyhedrons, respectively.

关键词： Nanostructurecl materials Chemical synthesis Microstructure Transmission electron microscopy

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

Real-time fault detection method based on belief rule base for aircraft navigation system

引用

Chinese Journal of Aeronautics 2013年第3期26卷 717-729页

作者： zhao xin wang Shicheng Zhang Jinsheng Fan Zhiliang Min Haibo High-Tech Institute of Xi'an

Real-time and accurate fault detection is essential to enhance the aircraft navigation system’s reliability and safety. The existent detection methods based on analytical model draws back at simultaneously detecting gradual and sudden faults. On account of this reason, we propose an online detection solution based on non-analytical model. In this article, the navigation system fault detection model is established based on belief rule base （BRB）, where the system measuring residual and its changing rate are used as the inputs of BRB model and the fault detection function as the output. To overcome the drawbacks of current parameter optimization algorithms for BRB and achieve online update, a parameter recursive estimation algorithm is presented for online BRB detection model based on expectation maximization （EM） algorithm. Furthermore, the proposed method is verified by navigation experiment. Experimental results show that the proposed method is able to effectively realize online parameter evaluation in navigation system fault detection model. The output of the detection model can track the fault state very well, and the faults can be diagnosed in real time and accurately. In addition, the detection ability, especially in the probability of false detection, is superior to offline optimization method, and thus the system reliability has great improvement.

关键词： Belief rule base Fault detection Fault tolerant control Integrated navigation Parameter recursive estimation algorithm

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

Cr(VI) removal from aqueous solution with bamboo charcoal chemically modified by iron and cobalt with the assistance of microwave

引用

Journal of Environmental Sciences 2013年第9期25卷 1726-1735页

作者： Wei wang Xuejiang wang xin wang Lianzhen Yang Zhen Wu Siqing Xia Jianfu zhao State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University

Bamboo charcoal （BC） was used as starting material to prepare Co-Fe binary oxideloaded adsorbent （Co-Fe-MBC） through its impregnation in Co（NO3）2 , FeCl3 and HNO3 solutions simultaneously, followed by microwave heating. The low-cost composite was characterized and used as an adsorbent for Cr（VI） removal from water. The results showed that a cobalt and iron binary oxide （CoFe2O4 ） was uniformly formed on the BC through redox reactions. The composite exhibited higher surface area （331 m2/g） than that of BC or BC loaded with Fe alone （Fe-MBC）. The adsorption of Cr（VI） strongly depended on solution pH, temperature and ionic strength. The adsorption isotherms followed the Langmuir isotherm model well, and the maximum adsorption capacities for Cr（VI） at 288 K and pH 5.0 were 35.7 and 51.7 mg/g for Fe-MBC and Co-Fe-MBC, respectively. The adsorption processes were well fitted by the pseudo second-order kinetic model. Thermodynamic parameters showed that the adsorption of Cr（VI） onto both adsorbents was feasible, spontaneous, and exothermic under the studied conditions. The spent Co-Fe-MBC could be readily regenerated for reuse.

关键词： bamboo charcoal microwave adsorption hexavalent chromium

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

Enhancing cell adhesive and antibacterial activities of glass-fibre-reinforced polyetherketoneketone through Mg and Ag PIII

引用

Regenerative Biomaterials 2023年第1期10卷 1278-1293页

作者： xin Tan Zhongyi wang xin Yang Ping Yu Manlin Sun Yuwei zhao Haiyang Yu State Key Laboratory of Oral Diseases National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengduChina Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences College of StomatologyChongqing Medical UniversityChongqingChina Jiangsu Key Laboratory of Oral Diseases Affiliated Hospital of StomatologyNanjing Medical UniversityNanjingChina Department of Stomatology Chengdu Second People’s HospitalChengduChina

Glass-fibre-reinforced polyetherketoneketone(PEKK-GF)shows great potential for application as a dental implant restoration material;however,its surface bioinertness and poor antibacterial properties limit its integration with peri-implant soft tissue,which is critical in the long-term success of implant ***,functional magnesium(Mg)and silver(Ag)ions were introduced into PEKK-GF by plasma immersion ion implantation(PIII).Surface characterization confirmed that the surface morphology of PEKK-GF was not visibly affected by PIII *** tests revealed that PIII changed the wettability and electrochemical environment of the PEKK-GF surface and enabled the release of Mg^(2+)and Ag^(+)modulated by Giavanni *** vitro experiments showed that Mg/Ag PIII-treated PEKK-GF promoted the proliferation and adhesion of human gingival fibroblasts and upregulated the expression of adhesion-related genes and *** addition,the treated samples inhibited the metabolic viability and adhesion of Streptococcus mutans and Porphyromonas gingivalis on their surfaces,distorting bacterial ***/Ag PIII surface treatment improved the soft tissue integration and antibacterial activities of PEKK-GF,which will further support and broaden its adoption in dentistry.

关键词： glass-fibre-reinforced polyetherketoneketone plasma immersion ion implantation human gingival fibroblasts antibacterial activity

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

Nano-yttrium-containing precipitates of T6 heat-treated A356.2 alloy when trace yttrium(Y less than 0.100 wt%) added

引用

Rare Metals 2021年第11期40卷 3279-3288页

作者： xin-Ping Hu Qing wang Henry Hu Rui-xin Li Yang zhao Zhi-Ming wang Bing-Rong Zhang School of Mechanical and Automotive Engineering Qilu University of TechnologyJinan 250353China Department of Mechanical University of WindsorAutomotive&MaterialsEngineering Windsor N9B 3P4Canada

To investigate the effect of yttrium(Y) on microstructure refinement and mechanical properties of aluminum alloy A356.2,the different trace contents of Y(0 wt%,0.025 wt%,0.050 wt%,0.075 wt%,or 0.100 wt%)were introduced into the liquid *** alloys were fabricated in a preheated permanent mold,and subsequently treated by a T6 heat *** results of tensile testing indicate that the yield strength(YS),the ultimate tensile strength(UTS) and the elongation(El) of the A356.2 alloy are improved by the Y *** YS dependence on grain size for the test alloys follows the Hall-Petch equation,which gives YS=-354.1+2875.2 d^(-1/2) with a correlation of R^(2)=*** 0.050 wt%Y is added,the optimum values of the YS,UTS and El are achieved after T6 heat *** secondary phases were identified by X-ray diffraction(XRD) which mainly consisted as Si,Mg2 Si and Al3 *** scanning electron microscope(SEM) and energy-dispersive spectrometer(EDS) analyses reveal the presence of the nano-sized Al3 Y particles on the surface of the Si *** A356.2 alloy with the Y addition is strengthened by the dendritic refinement,and the presence of the micron-and nano-sized Al3 Y precipitates.

关键词： Yttrium Microstructures Mechanical properties T6 heat treatment A356.2 alloy

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

Neural Network-Based State Estimation for Nonlinear Systems With Denial-of-Service Attack Under Try-Once-Discard Protocol

引用

IEEE/CAA Journal of Automatica Sinica 2024年第10期11卷 2182-2184页

作者： Xueli wang Shangwei zhao Ming Yang xin wang Xiaoming Wu the Key Laboratory of Computing Power Network and Information Security Ministry of EducationShandong Computer Science CenterQilu University of Technology(Shandong Academy of Sciences)Jinan 250014 Shandong Provincial Key Laboratory of Computer Networks Shandong Fundamental Research Center for Computer ScienceJinan 250014China Department of Automation Shanghai Jiao Tong UniversityShanghai 200240China

Dear Editor,This letter deals with state estimation issues of discrete-time nonlinear systems subject to denial-of-service(DoS)attacks under the try-once-discard(TOD)*** specifically,to reduce the communication burden,a TOD protocol with novel update rules on protocol weights is designed for scheduling measurement *** addition,unknown nonlinear functions vulnerable to DoS attacks are considered due to the openness and vulnerability of the network.

关键词： Service DoS service

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

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：