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Subtle Effect of Alkyl Substitutedπ-Bridges on Dibenzo[a,c]phenazine Based Polymer Donors towards Enhanced Photovoltaic Performance

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Chinese Journal of Polymer Science 2022年第8期40卷 889-897,I0007页

作者： Chun-Xian Ke xue Lai Heng-Tao Wang ming-Rui Pu Tahir Rehman Yu-lin Zhu Feng He Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and TechnologyShenzhen518055China Guangdong Provincial Key Laboratory of Catalysis Southern University of Science and TechnologyShenzhen518055China

Selection of the strategically substituted alkyl chains has a significant effect to modulate the physical properties of conjugated polymers,electro-optical characteristics,and active layer morphology of the corresponding polymer solar cells(PSCs).Herein,we systematically synthesized three dibenzo[a,c]phenazine based D-π-A donor polymers named PBP-C0,PBP-C8,and PBP-C6 with different alkyl substitutions on thiopheneπ-bridges,without alkyl,2-ethylhexyl and n-hexyl groups,*** absence of the alkyl chain(PBP-C0)on theπ-bridge caused poor solubility and unfavorable miscibility with the Y5 acceptor,leading to the lower photovoltaic *** bulky alkyl chain of 2-ethylhexyl on theπ-bridge group caused the twisting of PBP-C8 conjugated backbone,which limits the charge transport and also compromises the photovoltaic *** contrast,the PBP-C6-with flexible linear alkyl chains has almost planar curvature geometry resulting in the small uniform domain size and appropriate phase separation in the blend film *** favorable properties enhanced the exciton generation to dissociation,charge carrier mobility,and also lowered the charge *** three polymers,PBP-C6-based devices exhibit the best PCE of 11.60%.From these results,thiopheneπ-bridge alkyl substitution demonstrated an important strategy to adjust energy level,absorption,and phase separation morphology to enhance the photovoltaic performance of the PSCs.

关键词： π-Bridge Alkyl chain engineering Phenazine Polymer donor Polymer solar cell

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Theoretical Studies on the Thermodynamic Properties and Detonation Performances of Bicyclic Nitramines:TNAD Isomers

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Chinese Journal of Structural Chemistry 2006年第11期25卷 1309-1320页

作者： QIU ling XIAO He-ming GONG xue-Dong JU xue-Hai Institute for Computation in Molecular and Material Science School of Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 China

Ab initio molecular orbital calculations have been performed at Hartree-Fock （HF）, second-order Mrller-Plesset （MP2）, and hybrid density functional theory （DFT） B3LYP levels with 6-31G^＊＊ basis set to investigate the low sensitive explosive trans-1,4,5,8-tetranitro-1,4,5,8- tetraazadecalin （TNAD） and its seven bicyclic isomers. Their molecular geometries, electronic structures, thermodynamic properties, and detonation performances were predicted and compared. The relationships between structures and various properties were discussed in detail. The calculated results agree well with the available experimental data, and suggest that some compounds may be novel potential candidates of high energy density materials （HEDMs） with performances better than TNT （2,4,6-trinitrotoluene） and similar to RDX （1,3,5-trinitro-1,3,5-triazacyclohexane）.

关键词： bicyclic nitramine Hartree-Fock method MP2 method density functional theory thermodynamic properties detonation performances

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NUMERICAL SIMULATION OF 3-D FLOW FIELD IN ARCIFORM PLUNGE POOL

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Journal of Hydrodynamics 2002年第3期14卷 106-110页

作者： Xu, Wei-lin Liu, Shan-Jun Wang, Wei Qu, Jing-xue Diao, ming-Jun Hydraulics Lab. of High Speed Flows Sichuan Univ. Chengdu 610065 China

The 3-D complex turbulent flow fields in a plunge pool with arciform bottom are simulated by using the k-Ε model in body-fitted coordinates. The calculated results reveal the flow characteristics in the arciform plunge pool under the different flood discharge conditions, which can not be easily obtained in the physical model test because the measurement of the complex velocity is very difficult. The calculated flow fields are helpful to understand the hydraulic characteristics of plunge pool deeply. The calculated and the measured pressure distributions on the pool bottom are compared and in good agreement.

关键词： Computer simulation Flood control Flow of fluids Pressure distribution Three dimensional

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Bargaining strategy of oil companies in international oil and gas development Projects-Based on a bilateral bargaining model

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Petroleum Science 2021年第4期18卷 1270-1279页

作者： Qing xue Cheng Cheng Zhen Wang ming-ming Liu School of Economics and Management China University of PetroleumBeijing102249China School of Management Science and Engineering Shanxi University of Finance and EconomicsTaiyuan030006China

Bargaining between the host country and oil companies is very common to international oil and gas development *** existence of information asymmetry gives the host country an endogenous bargaining *** oil companies might change their unfavorable negotiating position by changing the order of bidding and adjusting bidding *** paper introduces both factors into a bilateral bargaining model to study the impact of information asymmetry and bidding order on the strategy and equilibrium returns of oil *** to the ownership of the right to bid first,two scenarios are designed for the model to compare the equilibrium returns of the host country and oil *** results show that:1)There is a first-mover advantage in the process of bilateral bidding,so oil companies better bid first;2)The information asymmetry will lead to a higher nominal income ratio of oil companies and a lower nominal income ratio of the host country,but it doesn’t affect the total income ratio at all.

关键词： International oil and gas development project Information asymmetry Cooperation strategy Bilateral bidding model

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Anaerobic oxidation of methane coupled to sulfate reduction: Consortium characteristics and application in co-removal of H_2S and methane

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Journal of Environmental Sciences 2019年第2期31卷 238-248页

作者： lin Li Song xue Jingru Xi State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of Sciences National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of Sciences State Key Laboratory of Applied Microbiology Southern China Guangdong Institute of MicrobiologyGuangdong Academy of Sciences

Anaerobic sludge from a sewage treatment plant was used to acclimatize microbial colonies capable of anaerobic oxidation of methane(AOM) coupled to sulfate reduction. Clone libraries and fluorescence in situ hybridization were used to investigate the microbial ***-reducing bacteria(SRB)(e.g., Desulfotomaculum arcticum and Desulfobulbus propionicus)and anaerobic methanotrophic archaea(ANME)(e.g., Methanosaeta sp. and Methanolinea sp.)coexisted in the enrichment. The archaeal and bacterial cells were randomly or evenly distributed throughout the consortia. Accompanied by sulfate reduction, methane was oxidized anaerobically by the consortia of methane-oxidizing archaea and SRB. Moreover, CH_4 and SO_4^(2-) were consumed by methanotrophs and sulfate reducers with CO_2 and H_2S as products. The H_3CSH produced by methanotrophy was an intermediate product during the process. The methanotrophic enrichment was inoculated in a down-flow biofilter for the treatment of methane and H_2S from a landfill site. On average, 93.33% of H_2S and 10.71% of methane was successfully reduced in the biofilter. This study tries to provide effective method for the synergistic treatment of waste gas containing sulfur compounds and CH_4.

关键词： Anaerobic methane oxidation Sulphate reduction Microbial population 13C isotope-labelling Potential pathway Landfill gas

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Effect of basicity and Al2O3 on viscosity of ferronickel smelting slag

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Journal of Iron and Steel Research International 2020年第12期27卷 1400-1406页

作者： Yong-feng Chen xue-ming Lv Zheng-de Pang xue-wei Lv Wuhu Xinxing Ductile Iron Pipes Co. Ltd.Wuhu 241000AnhuiChina Pangang Group Research Institute Co. Ltd.Panzhihua 617000SichuanChina Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

The effect of the Al2O3 content and basicity (the molar ratio of MgO to SiO2) on the viscosity of a SiO2-MgO-FeOAl2O3-CaO slag was studied to fully understand the smelting process of the ferronickel alloy. Experimental results show that the slag is a mixture of liquid and solid phases at the experimental temperature. The viscosity decreased as the basicity increased and increased as the Al2O3 content increased. To determine the effect of the Al2O3 content and basicity on the structure of the molten slag, Raman spectroscopy was performed on the slag sample, which was quenched from the high temperature with water. The Raman spectra showed that the fractions of the polymerization structural units decreased significantly as the basicity of the slag increased, resulting in a decrease in the apparent viscosity. However, Al2O3 acts as a network former in the slag system, thereby making the slag structure further polymerized and increasing the viscosity.

关键词： Nickel laterite ore Slag structure Viscosity Basicity Ferronickel smelting slag

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Analysis of Arc Physical Property of Pulsed Tungsten Inert Gas Welding Based on Fowler-Milne Method

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Journal of Shanghai Jiaotong university(Science) 2013年第3期18卷 343-347页

作者： WANG lin HUA xue-ming XIAO Xiao LI Fang WU Yi-xiong Welding Engineering Institute Shanghai Jiaotong University Shanghai Key Laboratory of Materials Laser Manufacturing and Modification Shanghai 200240 China

Pulsed tungsten inert gas （TIG） welding is widely used in industry due to its superior properties, so the measurement of arc telnperature is important to analyse welding process. Arc image of spectral line in 794.8 nm is captured by high speed camera; both the Abel inversion and the Fowler-Milne method are used to calculate the temperature distribution of the pulsed TIG welding. Characteristic of transient variation in arc intensity and temperature is analyzed. When the change of current happens, intensity and temperature of arc jump as well, it costs several millisoconds. The flirther the axial position from the tungsten is, the greater the intensity jumps, and the smaller the temperature changes.

关键词： pulsed tungsten inert gas (TIG) welding Fowler-Milne method arc temperature transient variation

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Interplay between Microscopic Structures and Macroscopic Viscoelastic Properties of Polyampholyte Gels

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Chinese Journal of Polymer Science 2024年第9期42卷 1360-1367,I0008页

作者： You-Cai xue Yi-ming Yang Di Jia Beijing National Laboratory for Molecular Sciences Laboratory of Polymer Physics and ChemistryInstitute of ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

Polyampholyte gels,which have hierarchical structures,exhibit excellent self-healing properties and have great promise for biomaterials and *** investigated the relationship between microscopic structures and macroscopic viscoelastic properties of polyampholyte gels and found three factors influencing their viscoelastic properties,including the chemical crosslinking bonds,topological entanglements controlled by monomer concentration,and the ionic *** strength plays a major role on the strength of ionic bonds.A crossover point of elastic modulus and loss modulus was observed in the dynamic frequency sweeps at low monomer concentration or low chemical crosslinking density for gels with intermediate strength of ionic *** solid-liquid transition signaled by the crossover point is a typical feature of dynamic associated gels,representing the dynamical association-dissociation of the ionic bonds and full relaxation of the topological entanglements in the gel *** the crossover point disappears when the ionic bonds are too weak or too strong to form“permanent”***,in the non-linear yielding measurement,gels with intermediate strength of the ionic bonds are ductile and yield at very large shear strain due to the self-healing properties and the dynamic association-dissociation of the ionic *** the self-healing properties disappear when the ionic bond strength is too weak or too *** work reveals the mechanism of how the dynamic association-dissociation of ionic bonds influences both the linear and non-linear viscoelastic properties of the polyampholyte gels.

关键词： Polyampholyte gel Ionic bond Topological entanglement Self-healing Hierarchical structure

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Intra-thyroid esophageal duplication cyst:A case report

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World Journal of Clinical Cases 2024年第13期12卷 2231-2236页

作者： Hong-Guo lin ming Liu xue-Yang Huang Da-Sheng Liu Department of Vascular Thyroid Surgery The Second Affiliated Hospital of Guangzhou University of Chinese MedicineGuangzhou 510006Guangdong ProvinceChina

BACKGROUND Esophageal cysts are relatively rare in clinical practice,with most of the literature comprising case *** cysts protruding into the thyroid gland are easily misdiagnosed as thyroid *** such cases have been reported so *** SUMMARY This article reports the case of a 31-year-old adult male diagnosed with thyroid nodules before *** patient underwent left thyroidectomy and *** the surgery,esophageal cysts were identified in the esophageal muscle and thyroid *** pathology results confirmed a nodular goiter combined with esophageal ***,the patient developed a neck infection and underwent another operation and broad-spectrum antibiotic treatment for *** We report the first clinical case of an esophageal cyst located within the thyroid gland that was successfully treated *** cyst located within the thyroid gland cause difficulties in *** the present study,the contents of the esophageal cysts were calcified foci,and a small amount of fluid mixture,which were easily misdiagnosed as thyroid nodules and misled the surgical methods.

关键词： Esophageal cysts Thyroid Diagnosed Surgery Case report

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Scalability Analysis of Request Scheduling in Cloud Computing

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Tsinghua Science and Technology 2019年第3期24卷 249-261页

作者： Chao xue Chuang lin Jie Hu Tsinghua National Laboratory for Information Science and Technology (TNList) & Department of Computer Science and Technology Tsinghua University

Rapid advancement of distributed computing systems enables complex services in remote computing clusters. Massive applications with large-scale and disparate characteristics also create high requirements for computing systems. Cloud computing provides a series of novel approaches to meet new trends and ***, some scalability issues have to be addressed in the request scheduling process and few studies have been conducted to solve these problems. Thus, this study investigates the scalability of the request scheduling process in cloud computing. We provide a theoretical definition of the scalability of this process. By modeling the scheduling server as a stochastic preemptive priority queue, we conduct a comprehensive theoretical and numerical analysis of the scalability metric under different structures and various environment configurations. The comparison and conclusion are expected to shed light on the future design and deployment of the request scheduling process in cloud computing.

关键词： cloud computing request scheduling scalability model evaluation

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