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Automated Testing of Web Applications Using Combinatorial Strategies

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Journal of Computer Science & Technology 2017年第1期32卷 199-210页

作者： Xiao-Fang Qi zi-yuan wang Jun-Qiang Mao Peng wang School of Computer Science and Engineering Southeast University Nanjing 211189 China Key Laboratory of Computer Network and Information Integration Ministry of Education Nanjing 211189 China School of Computer Science and Technology Nanjing University of Posts and Telecommunications Nanjing 210023 China

Recently, testing techniques based on dynamic exploration, which try to automatically exercise every possible user interface element, have been extensively used to facilitate fully testing web applications. Most of such testing tools are however not effective in reaching dynamic pages induced by form interactions due to their emphasis on handling client-side scripting. In this paper, we present a combinatorial strategy to achieve a full form test and build an automated test model. We propose an algorithm called pairwise testing with constraints （PTC） to iraplement the strategy. Our PTC algorithm uses pairwise coverage and handles the issues of semantic constraints and illegal values. We have implemented a prototype tool ComjaxTest and conducted an empirical study on five web applications. Experimental results indicate that our PTC algorithm generates less form test cases while achieving a higher coverage of dynamic pages than the general pairwise testing algorithm. Additionally, our ComjaxTest generates a relatively complete test model and then detects more faults in a reasonable amount of time, as compared with other existing tools based on dynamic exploration.

关键词： automated testing combinatorial testing web application

Organic Semiconducting Materials Based on BDOPV:Structures,Properties,and Applications

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Chinese Journal of Chemistry 2020年第1期38卷 13-24页

作者： Li Ding zi-yuan wang Jie-Yu wang Jian Pei College of Chemistry and Molecular Engineering Peking UniversityBeijing 100871China

What are the major current research activities of your group?To develop high performance organic semiconducting and conducting materials and also to understand their structure-property *** are also interested in the effect of the aggregation states of the con-jugated polymers on their electronic properties,the doping process and *** is the most important personality for scientific research?Curiosity and the desire to ***,one should enjoy and be happy in the process of scientific exploration.

关键词： mechanism. conducting aggregation

High thermoelectric properties realized in earth abundant Bi_(2)S_(3) bulk materials via Se and Cl co-doping in solution synthesis process

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Journal of Materials Science & Technology 2022年第5期100卷 51-58页

作者： Jun Guo Yu-Ke Zhu Lin Chen zi-yuan wang Zhen-Hua Ge Jing Feng Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Bi_(2)S_(3)-based alloys are considered promising thermoelectric materials due to their large Seebeck coefficient and low lattice thermal ***,low electrical conductivity usually leads to poor electrical transport properties,which seriously restricts their further application in thermoelectric refrigeration and/or power *** this work,Bi_(2)S_(3) with high electrical transport properties is synthesized hydrothermally via Se and Cl *** maximum electrical conductivity value of 483 S cm^(-1) was obtained for the Bi_(2)S_(2.4)Se_(0.4)Cl_(0.20) sample at room *** significant improvement of electrical conductivity gives rise to a high average power factor of 411μW m^(-1) K^(-2) during the measuring temperature range and a peak value of 456μW m^(-1) K^(-2) at 673 *** from the largely improved electrical transport properties,a superior ZT value of approximately 0.66 and *** 0.36 were obtained for Bi_(2)S_(2.4)Se_(0.4)Cl_(0.20),and the theoretically calculated conversion efficiency reached 5.7%.The results indicate that Bi_(2)S_(3) is a promising candidate for thermoelectric applications at medium temperatures.

关键词： Bismuth sulfide Electrical conductivity Doping Thermal conductivity

Synergistically enhanced thermoelectric properties of Bi_(2)S_(3) bulk materials via Cu interstitial doping and BiCl_(3) alloying

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Rare Metals 2022年第3期41卷 931-941页

作者： Jun Guo zi-yuan wang Yu-Ke Zhu Lin Chen Jing Feng Zhen-Hua Ge Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Bi_(2)S_(3)is composed of inexpensive and environ-mental friendliness elements,which has received extensive interests and been investigated as a promising mid-tempera-ture thermoelectric material for *** pure Bi_(2)S_(3)pos-sesses a high Seebeck coefficient and low thermal conductivity,its low electrical conductivity leads to a lowfigure of merit(ZT)*** this work,Bi_(2)S_(3)fabricated by solid-state melting combined with spark plasma sintering can significantly enhance the thermoelectric performance via introducing small amounts of Cu and BiCl_(3).Cu interstitial doping and Cl substitution on S site result in a large increase in electrical ***,the enhanced phonon scattering is derived from the point defects caused by element doping,the grain boundaries,and the small amount of sec-ondary phase,which leads to the low thermal ***,a high ZT value of 0.7 is obtained at 773 K and reaches a large average ZT of 0.36 in the temperature range from room temperature(RT)to 773 K for the Cu-interstitial-doped and BiCl_(3)-alloyed(Cu_(0.01)Bi_(2)S_(3)+0.175 mol%BiCl_(3))***,the mechanical properties of the Cu_(0.01)Bi_(2)S_(3)+0.175 mol%BiCl_(3)sample are lower than those of other Bi_(2)S_(3)samples,which stem from the weak chemical bonding strength.

关键词： Bismuth sulfide Cu–Cl co-doping Electrical conductivity Mechanical properties

A multi-fidelity prediction model for vertical bending moment and total longitudinal stress of a ship based on composite neural network

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Journal of Hydrodynamics 2023年第1期35卷 27-35页

作者： Cai-xia Jiang Yu-bo Liu zi-yuan wang Shuai Chen Sheng-ze Cai Qi Gao Xue-ming Shao Science and Technology on Advanced Composites in Special Environments Key Laboratory Harbin Institute of TechnologyHarbin150001China China Ship Scientific Research Center Wuxi214082China School of Aeronautics and Astronautics Zhejiang UniversityHangzhou310027China College of Control Science and Engineering Zhejiang UniversityHangzhou310027China

In ship engineering,the prediction of vertical bending moment(VBM)and total longitudinal stress(TLS)during ship navigation is of utmost *** this work,we propose a new prediction paradigm,the multi-fidelity regression model based on multi-fidelity data and artificial neural network(MF-ANN).Specifically,an ANN is used to learn the fundamental physical laws from low-fidelity data and construct an initial input-output *** predicted values of this initial model are of low accuracy,and then the high-fidelity data are utilized to establish a correction model that can correct the low-fidelity prediction ***,the overall accuracy of prediction can be improved *** feasibility of the multi-fidelity regression model is demonstrated by predicting the VBM,and the robustness of the model is evaluated at the same *** prediction of TLS on the deck indicates that just a small amount of high-fidelity data can make the prediction accuracy reach a high level,which further illustrates the validity of the proposed MF-ANN.

关键词： Artificial neural network multi-fidelity vertical bending moment total longitudinal stress

CuPbBi_(5)S_(9) thermoelectric material with an intrinsic low thermal conductivity:Synthesis and properties

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Journal of Materiomics 2022年第1期8卷 174-183页

作者： Hao Liang Jun Guo Yun-Xuan Zhou zi-yuan wang Jing Feng Zhen-Hua Ge Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093China

CuPbBi_(5)S_(9) compounds have been investigated as gladite for ***,there have been no significant studies on their physical and chemical *** work demonstrates that upon alloying with moderate Cu,Pb,Bi,and S using an appropriate preparation method,quaternary CuPbBi_(5)S_(9) compounds can exhibit excellent figure of merit ZT within the temperature range 298-723 K.A low average velocity,low Young’s modulus and Debye temperature,and large Grüneisen parameter,determined experimentally,indicate strong lattice anharmonicity in CuPbBi_(5)S_(9) ***,density functional theory calculations(local vibration of low-frequency acoustic phonons)justify the low lattice thermal conductivity of CuPbBi_(5)S_(9) *** of the low thermal conductivity(0.514 W m^(-1)K^(-1))and a relatively high power factor(293 μW m^(-1)K^(-2)),a maximum ZT of 0.42 was achieved at 723 K for CuPbBi_(5)S_(9) prepared by mechanical alloying combined with solid-state ***,CuPbBi_(5)S_(9) materials are promising candidates for use as high-performance thermoelectric materials in the intermediate-temperature range.

关键词： CuPbBi_(5)S_(9) Elastic properties Phonon spectrum Low thermal conductivity

An Overview of Stretchable Supercapacitors Based on Carbon Nanotube and Graphene

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Chinese Journal of Polymer Science 2020年第5期38卷 491-505,I0006页

作者： Wen-Le Ma Zhi-Hao Cai Yi Zhang zi-yuan wang Lun Xia Su-Ping Ma Guang-Hao Li Yi Huang National Institute for Advanced Materials Tianjin Key Laboratory of Metal and Molecule Based Material ChemistryKey Laboratory of Functional Polymer MaterialsCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)School of Materials Science and EngineeringNankai UniversityTianjin 300350China Beijing Institute of Aeronautical Materials Beijing 100095China

The wearable demand of modern electronic devices makes flexible and stretchable energy storage device urgently *** and flexible supercapacitors(SCs)are energy storage devices that provide ultrahigh power density while having long-term durability,high security,and electrochemical *** different SCs electrode materials,CNTs and graphene-based materials exhibit great potential in terms of stretchable SCs due to its ultrahigh electrical conductivity,large specific surface area and good mechanical *** this review,the state-of-the-art process and achievements in the field of stretchable SCs enabled by CNTs and graphene are presented,which include the novel design strategy,mechanical and electrochemical *** final section highlights current challenges and future perspectives on research in this thriving field.

关键词： Stretchable Supercapacitors Carbon materials Graphene CNTs

Development of re-crosslinkable dispersed particle gels for conformance improvement in extremely high-temperature reservoirs

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Petroleum Science 2022年第6期19卷 2922-2931页

作者： Dao-Yi Zhu Run-Tian Luo Yang Liu Jun-Hui Qin Qi Zhao Hong-Jun Zhang Wan-Sheng wang zi-yuan wang Meng-En Zhu Yi-Peng wang Peng-Bo Li China University of Petroleum-Beijing at Karamay Karamay 834000XinjiangChina

Micro-scale and nano-scale dispersed gel particles(DPG)are capable of deep migration in oil reservoirs due to their deformability,viscoelasticity,and suitable particle ***,it has been widely studied and applied in reservoir conformance control in recent ***,for highly permeable channels,their plugging performance is still *** addition,conventional in situ cross-linked polymer gels(ISCPGs)have fast gelation time under extremely high-temperature conditions,which often causes problems such as difficulty in ***,a re-cross linkable dispersed particle gel(RDPG)system applied for conformance control in highly permeable channels of extremely high-temperature petroleum reservoirs was *** particle size distribution,gelation time,gel strength,injection performance,and perfo rmance strength in po rous media were investigated using a laser particle size meter,the Sydansk bottle test method,rheometer,and core displacement experiments,*** show that the RDPG suspension can be stable for more than 6 months at room temperature with storage modulus G’much lower than 10 *** can pass through the pore throat by elastic deformation effect and does not cause strong ***,it can undergo re-crosslinking reaction at 150℃to form a strong bulk *** gel strength G’of re-crosslinked RDPG can be as high as 69.3 Pa,which meets the strength requirement of conformance *** RDPG suspension has the properties of easy injection,and it also has strong plugging,and high-temperature resistance after re-crosslinked in the core,which can be a very promising material for conformance improvement in extremely high-temperature reservoirs.

关键词： Dispersed particle gel Re-crosslinking Conformance improvement High-temperature petroleum reservoir Injection performance

Effect of nano TiO_(2) and SiO_(2) on gelation performance of HPAM/PEI gels for high-temperature reservoir conformance improvement

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Petroleum Science 2023年第6期20卷 3819-3829页

作者： Yang Liu Hong-Jun Zhang Dao-Yi Zhu zi-yuan wang Jun-Hui Qin Qi Zhao Yu-Heng Zhao Ji-Rui Hou China University of Petroleum Beijing102249China

Nanoparticles have been widely used in polymer gel systems in recent years to improve gelation performance under high-temperature reservoir conditions. However, different types of nanoparticles have different effects on their gelation performance, which has been little researched. In this study, the high-temperature gelation performance, chemical structure, and microstructure of polymer gels prepared from two nanomaterials (i.e., nano-SiO_(2) and nano-TiO_(2)) were measured. The conventional HPAM/PEI polymer gel system was employed as the control sample. Results showed that the addition of nano-TiO_(2) could significantly enhance the gel strength of HPAM/PEI gel at 80 ℃. The gel strength of the enhanced HPAM/PEI gel with 0.1 wt% nano-TiO_(2) could reach grade I. The system also had excellent high-temperature stability at 150 ℃. The enhanced HPAM/PEI gel with 0.02 wt% nano-TiO_(2) reached the maximum gel strength at 150 ℃ with a storage modulus (G′) of 15 Pa, which can meet the need for efficient plugging. However, the nano-SiO_(2) enhanced HPAM/PEI polymer gel system showed weaker gel strength than that with nano-TiO_(2) at both 80 and 150 ℃ with G′ lower than 5 Pa. Microstructures showed that the nano-TiO_(2) enhanced HPAM/PEI gel had denser three-dimensional (3D) mesh structures, which makes the nano-TiO_(2) enhanced HPAM/PEI gel more firmly bound to water. The FT-IR results also confirmed that the chemical structure of the nano-TiO_(2) enhanced HPAM/PEI gel was more thermally stable than nano-SiO_(2) since there was a large amount of –OH groups on the structure surface. Therefore, nano-TiO_(2) was more suitable as the reinforcing material for HPAM/PEI gels for high-temperature petroleum reservoir conformance improvement.

关键词： Nano-TiO_(2) Nano-SiO_(2) Gel strength Polymer gel High-temperature reservoirs.