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Aggregate 2024年第1期5卷 196-203页

作者： Changlin Zhou Meng Wang Qiaofeng Yao Yu Zhou Chuantao Hou Jianfei Xia Zonghua Wang Jishi Chen Jianping Xie co.lege of Chemistry and Chemical Engineering Shandong Sino-Japanese Center for Collaborative Research of Carbon NanomaterialsInstrumental Analysis Center of Qingdao UniversityQingdao UniversityQingdaoP.R.China Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin UniversityTianjinP.R.China Qingdao Boting Hydrogen Age Ocean Technol R&D Ctr. Qingdao Boting Technol Co.Ltd.Shandong Hydrogen Times Marine Technology Co.Ltd.QingdaoP.R.China Department of Chemical and Biomolecular Engineering National University of SingaporeSingapore Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhouP.R.China

Atomically precise metal nanoclusters(MNCs),as a potential type of photoaco.stic(PA)co.trast agent,are limited in application due to their low PA co.version efficiency(PACE).Here,with hydrophilic Au25SR18(SR=thiolate)as model NCs,we present a result that weakly polar solvent induces aggregation,which effectively enhances PA intensity and *** PA intensity and PACE are highly dependent on the degree of aggregation,while the aggregation-enhanced PA intensity(AEPA)positively co.relates to the protected *** an AEPA phenomenon indicates that aggregation actually accelerates the intramolecular motion of Au NCs,and enlarges the proportion of excited state energy dissipated through vibrational *** result co.flicts with the restriction of intramolecular motion mechanism of aggregation-induced *** experiments show that the increased energy of AEPA originates from the aggregation inhibiting the intermolecular energy transfer from excited Au NCs to their surrounding medium molecules,including solvent molecule and dissolved oxygen,rather than restricting radiative *** study develops a new strategy for enhancing the PA intensity of Au NCs,and co.tributes to a deeper understanding of the origin of the PA signal and the excited state energy dissipation processes for MNCs.

关键词： aggregation-enhanced photoaco.stic gold nanocluster intermolecular excited state energy transfer intramolecular motion ligand effect

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Investigation of polysulfone film on high-performance anode with stabilized electrolyte/electrode interface for lithium batteries

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Journal of Energy Chemistry 2020年第3期29卷 49-55页

作者： Yuyan Ma Chen Dong Qiuli Yang Yuxin Yin Xiaoping Bai Shuying Zhen Cheng Fan Kening Sun Beijing Key Laboratory for Chemical Power Source and Green Catalysis School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China Yinlong Energy co. Ltd.Zhuhai 519040GuangdongChina Institute of Advanced Structure technology Beijing Institute of TechnologyBeijing 100081China

Lithium metal has been co.sidered to be the most promising anode material for the new generation of energy-storage ***,challenges still stand in protecting lithium metal from spontaneous reactions with electrolytes and preventing the dendritic propagation,both of which would lead to undesirable decrease in co.lombic ***(PSf)membrane with high rigidity and free-volume cavities of approximately 0.3 nm was employed to provide a stable interface on the surface of anodic *** isotropic channels were co.structed by the interco.nected and uniformly distributed free volumes in the polymer matrix,and were expected to be swelled by solvent molecules and anions of lithium salt and to allow Li+ions to pass through onto the electrode *** a result,dendrite-free morphology of deposited lithium was *** stabilized interface arose from the PSf film was verified by the promoted performances of Cu|Li cells and steady voltage polarization of Li|Li *** full cell with PSf co.ted anode exhibited excellent cyclability(85%capacity retention rate over 400 cycles at 1C)and an outstanding rate capability(117 m Ah g-1 at 5C).The beneficial performances were further verified by the EIS *** work provides a new strategic idea to settle the dendritic problems of Li metal anodes.

关键词： Lithium metal Electrolyte/electrode interface Dendrite-free Polysulfone Free volume

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Insulation effect of air cavity in sand mold using 3D printing technology

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China Foundry 2018年第1期15卷 37-43页

作者： Cheng-yang Deng Jin-wu Kang Hao-long Shangguan Tao Huang Xiao-peng Zhang Yong-yi Hu Tian-you Huang School of Materials Science and Engineering Tsinghua University Key Laboratory for Advanced Materials Processing Technology Ministryof Education Beijing China Beijing DRUCK technology Development co. Ltd. China

The insulation effect of the air cavity surrounding the riser in a 3D printed sand mold was studied. The influence of the air cavity on heat flux was theoretically analyzed. The results demonstrated that the heat flux of the air cavity in the 3D printed sand mold was significantly less than that of resin-bonded sand. The insulation effect of the air cavity in sand molds for a cylinder casting and a stress-frame casting were simulated using software co.SOL. The results illustrated that the air cavity co.ld be used to insulate the riser and it was more suitable for a lower melting point metal casting. An air cavity with 10-15 mm width and 5-10 mm away from the riser can significantly prolong the solidification of the riser by over 10%. Meanwhile, the sand mold for the stressframe was made by 3D printing technology and poured with aluminum alloy A356 melt. The experiment results showed that the presence of the air cavity led to a 12.5% increase of the solidification time of its riser.

关键词： 3D printing sand mold air cavity insulation effect riser

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Ensuring the Authenticity and Non-Misuse of Data Evidence in Digital Forensics

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Journal of Harbin Institute of technology(New Series) 2015年第1期22卷 85-90页

作者： Jingsha He Gongzheng Liu Bin Zhao Xuejiao Wan Na Huang School of Software Engineering Beijing University of Technology Dept. of co.puter Science Jining University State Key Laboratory of Digital Publishing technology Peking University Founder Group Co.Ltd

In forensic investigations,it is vital that the authenticity of digital evidence should be ensured. In addition,technical means should be provided to ensure that digital evidence co.lected cannot be misused for the purpose of perjury. In this paper,we present a method to ensure both authenticity and non-misuse of data extracted from wireless mobile devices. In the method,the device ID and a timestamp beco.e a part of the original data and the Hash function is used to bind the data together. Encryption is applied to the data,which includes the digital evidence,the device ID and the timestamp. Both symmetric and asymmetric encryption systems are employed in the proposed method where a random session key is used to encrypt the data while the public key of the forensic server is used to encrypt the session key to ensure security and efficiency. With the several security mechanisms that we show are supported or can be implemented in wireless mobile devices such as the Android,we can ensure the authenticity and non-misuse of data evidence in digital forensics.

关键词： digital forensics authenticity non-misuse digital

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A new nonfullerene acceptor with an extended π co.jugation co.e enables ternary organic solar cells approaching 19%efficiency

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Nano Research 2024年第5期17卷 4062-4068页

作者： Chunyan Liu Nailiang Qiu Zhengjin Li Yan lu School of Materials Science and Engineering Tianjin Key Laboratory for Photoelectric Materials and DevicesKey Laboratory of Display Materials and Photoelectric DevicesMinistry of EducationTianjin University of TechnologyTianjin 300384China School of Chemistry Chemical Engineering and MaterialsJining UniversityQufu 273155China

In organic solar cells(OSCs),it is an effective way to improve the power co.version efficiency(PCE)by adding a guest co.ponent with appropriate absorption and energy levels in the host ***,a new nonfullerene acceptor(NFA)named TBF-2Cl was developed by the strategy of expanding theπco.jugated co.e of 2,2’-(((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b’]dithiophene-2,7-diyl)bis(methaneylylidene))bis(5,6-dichloro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile(IDT-4Cl)with two benzene *** increase of benzene units,TBF-2Cl exhibits higher lowest unoccupied molecular orbital(luMO)level of-3.75 eV than that of one benzene unit based NFA IDT-4Cl and fluorene co.e based NFA F-2Cl,which facilitates enhancing the open-circuit voltage(V_(oc))of ternary ***,TBF-2Cl film shows a medium optical bandgap with the absorption range from 500-800 nm,being well co.plementary with the wide bandgap polymer donor D18 and narrow bandgap NFA ***,a remarkable PCE of 18.92%with a high short-circuit current density(J_(sc))of 27.40 mA·cm^(-2),a fill factor(FF)of 0.749,especially an outstanding V_(oc) of 0.922 V was achieved for the optimal ternary device based on D18:TBF-2Cl:CH-6F,surpassing the binary co.nterpart(17.08%).The findings provide insight into the development of new guest acceptors for obtaining more efficient OSCs.

关键词： medium optical bandgap high lowest unoccupied molecular orbital(luMO)level the third co.ponent ternary organic solar cell high open-circuit voltage

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Performance Study Based on Inner Flow Field Numerical Simulation of Magnetic Drive Pumps with Different Rotate Speeds

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Chinese Journal of Mechanical Engineering 2012年第1期25卷 137-143页

作者： KONG Fanyu SHEN Xiaokai WANG Wenting ZHOU Shuiqing Research Center of Fluid Machinery Engineering and technology Jiangsu UniversityZhenjiang 212013China Wuxi Diesel Engine Works Faw Jiefang Automotive Co.Ltd.Wuxi 214026China

Magnetic drive pump has gotten great achievement and has been widely used in some special fields. Currently, the researches on magnetic drive pump have focused on hydraulic design, bearing, axial force in China, and a new magnetic drive pump with low flow and high head have been developed overseas. However, low efficiency and large size are the co.mon disadvantages for the magnetic drive pump. In order to study the performance of high-speed magnetic drive pump, FluENT was used to simulate the inner flow field of magnetic drive pumps with different rotate speeds, and get velocity and pressure distributions of inner flow field. Acco.ding to analysis the changes of velocity and pressure to ensure the stable operation of pump and avoid cavitation. Based on the analysis of velocity and pressure, this paper presents the pump efficiency of magnetic drive pumps with different rotated speeds by calculating the power loss in impeller and volute, hydraulic loss, volumetric loss, mechanical loss and discussing the different reasons of power loss between the magnetic drive pumps with different rotated speeds. In addition, the magnetic drive pumps were tested in a closed testing system. Pressure sensors were set in inlet and outlet of magnetic drive pumps to get the pressure and the head, while the pump efficiency co.ld be got by calculating the power loss between the input power and the outlet power. The results of simulation and test were similar, which shows that the method of simulation is feasible. The proposed research provides the instruction to design high-speed magnetic drive pump.

关键词： magnetic drive pump simulation power loss pump efficiency

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High precision and efficiency robotic milling of co.plex parts:Challenges,approaches and trends

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Chinese Journal of Aeronautics 2022年第2期35卷 22-46页

作者： Zerun ZHU Xiaowei TANG Chen CHEN Fangyu PENG Rong YAN Lin ZHOU Zepeng LI Jiawei WU School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Digital Manufacturing Equipment and technology Huazhong University of Science and TechnologyWuhan 430074China Wuhan Digital Design and Manufacturing Innovation Centre co. Ltd.Wuhan 430074China

Due to the advantages of large workspace,low co.t and the integrated vision/force sensing,robotic milling has beco.e an important way for machining of co.plex *** recent years,many scholars have studied the problems existing in the applications of robotic milling,and lots of results have been made in the dynamics,pose planning,deformation co.trol etc.,which provides theoretical guidance for high precision and high efficiency of robotic *** the perspective of co.plex parts robotic milling,this paper focuses on machining process planning and co.trol techniques including the analysis of the robot-workspace,robot trajectory planning,vibration monitoring and co.trol,deformation monitoring and *** well as the principles of these technologies such as robot stiffness characteristics,dynamic characteristics,chatter mechanisms,and deformation *** methods and characteristics related to the theory and technology of robotic milling of co.plex parts are summarized *** latest research progress and achievements in the relevant fields are *** is hoped that the challenges,strategies and development related to robotic milling co.ld be clarified through the carding work in this paper,so as to promote the application of related theories and technologies in high efficiency and precision intelligent milling with robot for co.plex parts.

关键词： co.plex parts Deformation Dynamics Robotic milling Stiffness Vibration co.trol

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Deformation behavior of a TiZr-based metallic glass co.posite co.taining dendrites in the superco.led liquid region

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Journal of Materials Science & technology 2020年第2期37卷 64-70页

作者： Longjun Wu Zhengwang Zhu Dingming Liu Huameng Fu Hong Li Aimin Wang Hongwei Zhang Zhengkun Li Long Zhang Haifeng Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China Dongguan Eontec co. LtdDongguan523662China Shenyang Amorphous Metal Manufacturing co. Ltd.Shenyang110000China

The deformation behavior of a TiZr-based bulk metallic glass co.posite(BMGC)was characterized in the superco.led liquid region(SLR)from 623 K to 693 *** was observed that the alloy exhibits the deformation behavior from work softening at low temperatures to work hardening at high *** yield stress and overshoot stress decrease remarkably with the increase of temperature,acco.panied by *** results showed that the crystallization occurred in the amorphous matrix for the post-deformation samples and the volume fraction of the co.responding crystallization products increased with increasing testing *** is implied that the work hardening behavior was closely associated with the crystallization of the amorphous *** tensile stress can accelerate the crystallization of amorphous matrix and the martensitic transformation of dendrite phases,which implies that the thermal stability of the alloy decreases under *** findings shed light on designing new BMGCs with high mechanical performance as well as the good SLR formability.

关键词： Bulk metallic glass co.posite Tension Work hardening ability Superplasticity Crystallization

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Based on FP-Growth Algorithm to Excavate Medication Rule of Chinese Materia Medica for Radiation Esophagitis

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World Journal of Integrated Traditional and Western Medicine 2020年第7期6卷 31-38页

作者： ZHANG Fu-peng ZHAO Xiao-yan LI Yi-fang HAO Shu-lan WANG Ai-rong GUO Bai-shi LIU Li-kun shanxi Provincial Academy of Traditional Chinese Medicine/shanxi Provincial Hospital of Traditional Chinese Medicine Taiyuan 030012China shanxi Provincial Hospital of Integrated Traditional Chinese and Western Medicine Taiyuan 030013China shanxi Fangzheng Information technology co. Ltd.Taiyuan030013China

Objective:To find the medication rule of Chinese materia medica for treating radiation esophagitis through FP-Growth ***:By searching the three major literature databases such as Chinese Journal Full-text Database,VIP Chinese Sci-tech Journals Database,Wanfang Data,*** the database establishment to May 10,2020,88 effective documents and 91 prescriptions were *** medication frequency of prescription in the paper was extracted and ***:The frequency of medicinal property from high to low were:slightly co.d,co.d,balance,warm,co.l,slightly warm,and great *** frequency of medicinal taste from high to low were:sweet,bitter,pungent,slightly bitter,salty,slightly pungent,sour,light,*** frequency of channel tropism from high to low were:lung,stomach,liver,heart,spleen,etc.,and 10 herbal co.binations with clinical significance were *** was one prescription with good co.relation strength in the clinical treatment of radiation ***:The medication rule of Chinese materia medica for the treatment of radiation esophagitis is based on the principles of clearing away heat and detoxification,benefiting Qi(气)and nourishing Yin(阴),and stopping bleeding and removing ***-clearing medicine,tonic medicine,phlegmresolving,co.gh–relieving medicine and asthma-relieving medicine,blood-activating and stasis removing medicine were highly frequent *** high-frequency association rules are nourishing Yin–clearing heat–generating fluid,removing toxin–co.ling blood–benefiting Qi,benefiting Qi–invigorating spleen–stopping *** is stable and feasible to use FP-Growth algorithm to mine traditional Chinese medicine(TCM)to treat diseases.

关键词： FP-Growth Mining Ridiation esophagitis Chinese materia medica

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Simulation on solidification structure of 72A tire co.d steel billet using CAFE method

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China Foundry 2012年第1期9卷 53-59页

作者： Jing Cailiang Xu Zhigang Wang Ying Wang Wanjun School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing 100083China technology Center of Xingtai Iron&Steel co. Ltd.Xingtai 054027HebeiChina

The solidification microstructure has an important effect on the mechanical properties of castings. Therefore, an FE （Finite Element） - CA （Cellular Automaton） co.pling model was developed for the simulation of solidification structure during the co.tinuous casting process of 72A tire co.d steel. In the model, the effect of phase transformation （λ→γ→α） during solidification was co.sidered based on a thermodynamic database. The effect of electromagnetic stirring （EMS） was determined by increasing both the thermal co.ductivity and crystal formation rate in the liquid phase. The results show that the co.ling curves and solidification structure calculated by this model agree well with the experimental results. The optimum pouring temperature range for tire co.d steel casting was also discussed based on the present model. By co.prehensive co.sideration of billet quality and smooth production, the pouring temperature should be co.trolled at about 1,495 ℃ under the casting co.ditions of the local plant in this study.

关键词： tire co.d steel solidification structure CAFE method phase transformation EMS

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