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Preparation and property of CL-20/BAMO-THF energetic nanocomposites

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Defence Technology（防务技术） 2019年第3期15卷 306-312页

作者： Teng chen Yan Zhang Shuang-feng Guo Liu-ming Zhao wei chen Ga-zi Hao Lei Xiao xiang Ke wei Jiang National Special Superfine Powder Engineering Research Center of China School of Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 PR China Xi'an Modern Chemistry Research Institute Shaanxi 710065 PR China

A sol-gel freezing-drying method was utilized to prepare energetic nanocomposites based on 2, 4, 6, 8,10, 12-hexanitro-2, 4, 6, 8, 10, 12-hexaazaisowurtzitane(CL-20) with 3, 3-Bis(azidomethyl) oxetanetetrahydrofuran copolymer(BAMO-THF) as energetic gel matrix. Scanning electron microscopy(SEM),X-ray diffraction(XRD), Raman, Fourier-transform infrared spectroscopy(FT-IR) and differential thermal analyser(DTA) were utilized to characterize the structure and property of the resultant energetic nanocomposites. Compared with raw CL-20, the average particle sizes of CL-20 in CL-20/BAMO-THF energetic nanocomposites were decreased to nano scale and the morphologies of CL-20 were also changed from prismatic to spherical. FT-IR detection revealed that CL-20 particles were recrystallized in BAMO-THF gel matrix during the freezing-drying process. The thermal decomposition behaviors of the energetic nanocomposites were investigated as well. The thermolysis process of CL-20/BAMO-THF nanocomposites was enhanced and the activation energy was lower compared with that of raw CL-20,indicating that CL-20/BAMO-THF nanocomposites showed high thermolysis activity. The impact sensitivity tests indicated that CL-20/BAMO-THF energetic nanocomposites presented low sensitivity performance.

关键词： CL-20/BAMO-THF nanocomposites Kinetic Thermodynamic Impact sensitivity

Optimization of Ethylene Glycol Doped PEDOT:PSS Transparent Electrodes for Flexible Organic Solar Cells by Drop-coating Method

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Chinese Journal of Polymer Science 2019年第8期37卷 760-766页

作者： Hui-Qin cui Rui-xiang Peng wei Song Jian-Feng Zhang Jia-ming Huang Li-Qiang Zhu Zi-Yi Ge Faculty of Materials Science and Chemical Engineering Ningbo University Ningbo 315211 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China

Fabrication of flexible transparent electrodes(FTEs) is one of the core technologies in the field of flexible electronics. Among multiple choices of FTEs, poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonic acid)(PEDOT:PSS) has shown its promising application in roll-to-roll manufacturing. A simple yet effective method for substantially boosting the conductivity of these conducting polymer films without causing large-domain aggregations is by adding ethylene glycol(EG) as dopant. Herein, we investigated in detail the effects of the secondary solvent of ethylene glycol(EG) on the optical and electrical characteristics of PEDOT:PSS films. The modified PEDOT:PSS FTEs were deposited using drop-coating techniques as it had greater compatibility for large-area samples than the conventional spin-coating method did. The 6% EG-doped PEDOT:PSS FTE via drop-coating method achieved a high figure of merit(FoM) value of 47.24 and the devices fabricated using the optimal PEDOT:PSS FTE yielded a high power conversion efficiency(PCE) of 8.89%, mostly attributed to the modified PEDOT:PSS films that had excellent optical and electrical characteristics with low surface roughness. These results suggested that EG-doping could effectively boost the conductivity of PEDOT:PSS films and that the modified PEDOT:PSS FTE is suitable for roll-to-roll manufacturing in the future.

关键词： PEDOT:PSS Doping Conductivity Flexible transparent electrodes Organic solar cells

A deep learning approach to the classification of 3D CAD models

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第2期15卷 91-106页

作者： Fei-wei QIN Lu-ye LI Shu-ming GAO Xiao-ling YANG xiang chen State Key Lab of CAD & CG Zhejiang University

Model classification is essential to the management and reuse of 3D CAD *** model classification is laborious and error *** the same time,the automatic classification methods are scarce due to the intrinsic complexity of 3D CAD *** this paper,we propose an automatic 3D CAD model classification approach based on deep neural *** to prior knowledge of the CAD domain,features are selected and extracted from 3D CAD models first,and then preprocessed as high dimensional input vectors for category *** analogy with the thinking process of engineers,a deep neural network classifier for 3D CAD models is constructed with the aid of deep learning *** obtain an optimal solution,multiple strategies are appropriately chosen and applied in the training phase,which makes our classifier achieve better *** demonstrate the efficiency and effectiveness of our approach through experiments on 3D CAD model datasets.

关键词： CAD model classification Design reuse Machine learning Neural network

The Phase Transition of Nematic Liquid Crystal Cells Bounded by Surfactant-Laden Interfaces

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Chinese Physics Letters 2011年第6期28卷 206-209页

作者： ZENG ming-Ying cui wei TAN Xiao-Qin WU chen-Xu Department of Physics and ITPA Xiamen UniversityXiamen 361005 College of Information Science and Engineering Huaqiao UniversityXiamen 361021

Taking into account the surface-coupling strength effect,we discuss the phase transitions of a finite thickness cell bounded by surfactant-laden interfaces in a magnetic field perpendicular to the substrate and it is compared with that of a semi-infinite *** is found that the larger the thickness,the closer the three-dimensional phase transition surface of the finite system to that of the semi-infinite *** simulation also shows that when a magnetic field is applied to a nematic semi-infinite sample,an orientational phase transition first takes place close to the interface and then extends to the inner space as the temperature increases.

关键词： infinite semi finite

In Situ Synthesis of Heat Resistant Gradient Composite on Steel Surface

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Journal of Iron and Steel Research International 2009年第2期16卷 89-94页

作者： cui xiang-hong WANG Feng WANG Shu-qi YANG Zi-run GAO ming-juan wei Min-xian School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 Jiangsu China

A heat resistant gradient composite was synthesized in situ on steel with the self-propagating high temperature synthesis （SHS） reaction of 3Ni-Al-Ti-C system during casting. The phases, microstructure, and composition of the composite were analyzed by using an X-ray diffractometer （XRD）, and a scanning electron microscope （SEM） coupled with an energy-dispersive X-ray spectroscope （EDS）. The formation mechanism of the composite is also discussed. TiC/Ni3 Al/steel gradient composite is achieved by forming the gradient distributions of Fe, Ni, and Al, accompanied with the gradient variation of the microstructure from TiC/Nia A1, to TiC/Ni3 Al/steel, and to steel. The composite is in situ synthesized through whole reaction of 3Ni-Al-Ti-C system in liquid steel and densification procedure, and the liquid steel infiltrates into pores in the SHS product and forces liquid Ni3Al to form self-compaction further.

关键词： steel heat resistant composite synthesis microstructure

The Active Compensation Technique for Large Reflector Antennas Based on Quadratic Curve Fitting

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Research in Astronomy and Astrophysics 2024年第7期24卷 226-234页

作者： Tian-xiang Zheng Bin-Bin xiang Han-wei cui wei Wang Pei-Yuan Lian Shang-ming Lin Yang Zhang Jian-Ping Zhou Kai Li School of Mechanical Engineering Xinjiang UniversityUrumqi 830017China School of Mechano-Electronic Engineering Xidian UniversityXi’an 710017China Xi’an Institute of Optics and Precision Mechanics Chinese Academy of SciencesXi’an 710119China

Active reflectors are often used to compensate the surface distortion caused by environmental factors that degrade the electromagnetic performance of large high-frequency reflector *** is crucial for maintaining high gain operation in antennas.A distortion compensation method for the active reflector of a large dual-reflector antenna is proposed.A relationship is established between the surface deformation and the optical path difference for the primary reflector by geometric ***,employing finite element analysis,a polynomial fitting approach is used to describe the impact of adjusting points on the reflector surface based on the coordinates of each *** standardizing the positions of various panels on the reflector,the fitting ns can be applied to the reflector panels of similar ***,based on the distribution characteristics of the primary reflector panels,the adjustment equation for the actuators is derived by the influence matrix *** can be used to determine the adjustment amount of actuators to reduce the rms of the optical path ***,the least squares method is employed to resolve the matrix *** example of a 110 m aperture dual-reflector antenna is carried out by finite element analysis and the proposed *** results show that the optical path difference is reduced significantly at various elevation cases,which indicates that the proposed method is effective.

关键词： Methods analytical-Methods numerical-Telescopes

DeltaFuzz: Historical Version Information Guided Fuzz Testing

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Journal of Computer Science & Technology 2022年第1期37卷 29-49页

作者： Jia-ming Zhang Zhan-Qi cui xiang chen Huan-Huan Wu Li-wei Zheng Jian-Bin Liu Computer School Beijing Information Science and Technology UniversityBeijing 100101China School of Information Science and Technology Nantong UniversityNantong 226019China

With the widespread use of agile software development methods,such as agile and scrum,software is iteratively updated more *** ensure the quality of the software,regression testing is conducted before new versions are ***,to improve the efficiency of regression testing,testing efforts should be concentrated on the modified and impacted parts of a ***,the costs of manually constructing new test cases for the modified and impacted parts are relatively *** testing is an effective method for generating test data automatically,but it is usually devoted to achieving higher code coverage,which makes fuzz testing unsuitable for direct regression testing *** this reason,we propose a fuzz testing method based on the guidance of historical version ***,the differences between the program being tested and the last version are analyzed,and the results of the analysis are used to locate change ***,change impact analysis is performed to find the corresponding impacted basic ***,the fitness values of test cases are calculated according to the execution traces,and new test cases are generated iteratively by the genetic *** on the proposed method,we implement a prototype tool DeltaFuzz and conduct experiments on six open-source *** with the fuzzing tool AFLGo,AFLFast and AFL,DeltaFuzz can reach the target faster,and the time taken by DeltaFuzz was reduced by 20.59%,30.05%and 32.61%,respectively.

关键词： fuzz testing regression testing change impact analysis fitness function

Dynamic Analysis of A Deepwater Drilling Riser with A New Hang-off System

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China Ocean Engineering 2024年第1期38卷 29-41页

作者： LI Yan-wei LIU Xiu-quan WANG Jin-long chen Guo-ming CHANG Yuan-jiang SHENG Lei-xiang Centre for Offshore Engineering and Safety Technology China University of PetroleumQingdao 266580China National Engineering Laboratory of Offshore Geophysical and Exploration Equipment China University of PetroleumQingdao 266580China China CNOOC Research Institute Co. Ltd.Beijing 100028China

The safety of risers in hang-off states is a vital challenge in offshore oil and gas engineering.A new hang-off system installed on top of risers is proposed for improving the security of *** approach leads to a challenging problem:coupling the dynamics of risers with a new hang-off system combined with multiple structures and complex *** accurately analyze the dynamic responses of the coupled system,a coupled dynamic model is established based on the Euler-Bernoulli beam-column theory and penalty function method.A comprehensive analysis method is proposed for coupled dynamic analysis by combining the finite element method and the Newmarkβ*** analysis program is also developed in MATLAB for dynamic *** simulation results show that the dynamic performances of the risers at the top part are significantly improved by the new hang-off system,especially the novel design,which includes the centralizer and articulation *** bending moment and lateral deformation of the risers at the top part decrease,while the hang-off joint experiences a great bending moment at the bottom of the lateral restraint area which requires particular attention in design and *** platform navigation speed range under the safety limits of risers expands with the new hang-off system in use.

关键词： deepwater drilling riser new hang-off system dynamic analysis finite element method penalty function method

Effects of permissive hypocaloric vs standard enteral feeding on gastrointestinal function and outcomes in sepsis

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World Journal of Gastroenterology 2021年第29期27卷 4900-4912页

作者： Jia-Kui Sun Shuai Nie Yong-ming chen Jing Zhou xiang Wang Su-ming Zhou Xin-wei Mu Department of Critical Care Medicine Nanjing First HospitalNanjing Medical UniversityNanjing 210006Jiangsu ProvinceChina Department of Geriatric Intensive Care Unit The First Affiliated Hospital of Nanjing Medical University(Jiangsu Province People’s Hospital)Nanjing 210006Jiangsu ProvinceChina

BACKGROUND Intestinal mucosal barrier injury and gastrointestinal dysfunction are important causes of ***,few studies have investigated the effects of enteral underfeeding on gastrointestinal function in ***,no consensus on goal enteral caloric intake has been reached in *** To investigate the effects of different goal caloric requirements of enteral nutrition on the gastrointestinal function and outcomes in the acute phase of *** Patients were randomly assigned to receive 30%(defined as group A),60%(group B),or 100%(group C)of goal caloric requirements of enteral nutrition in this prospective pilot clinical *** acute gastrointestinal injury(AGI)grades,incidence of feeding intolerance(FI),daily caloric intake,nutritional and inflammatory markers,and biomarkers of mucosal barrier function were collected during the first 7 d of enteral *** clinical severity and outcome variables were also *** A total of 54 septic patients were *** days to goal calorie of group C(2.55±0.82)were significantly longer than those of group A(3.50±1.51;P=0.046)or B(4.85±1.68;P<0.001).The FI incidence of group C(16.5%)was higher than that of group A(5.0%)or B(8.7%)(P=0.009).No difference in the incidence of FI symptoms was found between groups A and *** serum levels of barrier function biomarkers of group B were significantly lower than those of group A(P<0.05)on the 7th day of *** prealbumin and IL-6 levels of group A were lower than those of group B(P<0.05)on the 7th day of *** significant differences in the clinical outcome variables or 28-d mortality were found among the three *** Early moderate enteral underfeeding(60%of goal requirements)could improve the intestinal barrier function and nutritional and inflammatory status without increasing the incidence of FI symptoms in ***,further large-scale prospective clinical trials and animal studies are required to test our fin

关键词： Enteral feeding Enteral nutrition Gastrointestinal function Intestinal mucosal barrier Sepsis