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Study on Improving the Fluidity of Ti2alnb Alloy

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SSrN 2023年

作者： Zhang, Jian Zhang, Xiwen Wang, Hongwei Wu, Mengwei Ma, Xiong Liang, Xiaobo Zhang, Jianwei Liu, ruiping Zhao, Huiyou Sun, Zhimin Zhang, Ji School of Electromechanical and Information Engineering China University of Mining and Technology - Beijing Beijing100083 China Gaona Aero Material Co Ltd Beijing100081 China Beijing Key Laboratory of New Superalloy Materials Beijing100081 China Digital R&D Center of Central Iron & Steel Research Institute Group Beijing100081 China

In this paper, the effects of trace elements such as Al, Nb main elements, Fe, Mo, W, co, B and Si on the fluidity of Ti-22Al-25Nb alloy were investigated. The alloy composition which is beneficial to improve the fluidity was selected by calculating the thermal property parameters affecting the fluidity of the alloy through thermodynamic software, numerical simulation test of the fluidity of the alloy and verification test of the fluidity of the preferred alloy. Finally, the improvement mechanism of the alloy fluidity was discussed. results showed that the appropriate reduction of Nb element was better than Al element for the improvement of fluidity. The addition of trace Fe, B and Si elements was beneficial to the improvement of fluidity, the improvement effect of B element was the best, while the addition of trace Mo, W, and co was not conducive to the improvement of fluidity. The cessation mechanism of Ti2AlNb alloy is the cessation mechanism of the alloy with a wide crystallization temperature range. The composition which was the most beneficial to improve the fluidity was Ti-22Al-24Nb-0.1B. The main reasons for the improvement of the fluidity were that on the one hand, reducing 1at% Nb and adding 0.1at% B not only increased the superheat and crystallization latent heat but also reduced the melt viscosity and thermal conductivity, thus improving the fluidity. And on the other hand, the TiB phase refined the grains, and the fine grains prevented the dendrites from growing into a well-developed dendritic network, inhibited the adverse effect of the increase in the width of the solidification zone on the fluidity, and further improved the fluidity. © 2023, The Authors. All rights reserved.

关键词： Ternary alloys

The Optimal Energy Flow of combined Heat and Power Systems considering Users' comfort 5

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The Optimal Energy Flow of Combined Heat and Power Systems C...

5th IEEE conference on Energy Internet and Energy System Integration, EI2 2021

作者： Lin, Junguang Pan, Zhaoguang Zhao, Shenyi Wu, Fan Jiang, Yuehong Shi, runye International Joint Lab on Low-grade Energy Utilization of Zhejiang Province Zhejiang Energy Group R&D Institute Co. Ltd.2 Hangzhou China Department of Electrical Engineering and Applied Electronics Technology Tsinghua University Beijing China Tsinghua-Berkeley Shenzhen Institute Tsinghua University Shenzhen China

ISBN: (纸本)9781665434256

combined heat and electric power energy networks are common as multi-energy systems and its optimal operation is a hot topic. The goals of this manuscript is to achieve the optimal heat and power flow for the coupling network with tree-topology heat network and dC power network. The study aims to minimize the total deviations between user setting points and building indoor temperatures, decrease total energy consumption and cost. An optimization model is proposed using a steady-state method. The effectiveness of this method is proved by simulation results. Optimal operational schedule is obtained which can considers the complexity of the combined heat and electric networks. © 2021 IEEE

关键词： Electric load flow

Stability research and the designation of the control Scheme for the Acetone-Butanol-Ethanol distillation Based on dynamic Simulation

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SSrN 2024年

作者： Liu, Gen Gao, Yunxing Tan, Xinyi Lin, Xiaohui Hou, Xuedan Zhang, Honggang Wang, Jianhong Liu, Junfeng Chen, Huidong Cai, di Center for Process Simulation & Optimization Beijing University of Chemical Technology Beijing100029 China Collage of Chemical Engineering Beijing University of Chemical Technology Beijing100029 China College of Life Science and Technology Beijing University of Chemical Technology Beijing100029 China School of Materials Science and Engineering Beijing Institute of Technology Beijing100081 China School of Biomedical and Pharmaceutical Science Guangdong University of Technology Guangzhou510006 China Co. Ltd. Heilongjiang Suihua152300 China High-Tech Reseach Institute Beijing University of Chemical Technology Beijing100029 China National Energy R&D Center for Biorefinery Beijing University of Chemical Technology Beijing100029 China

distillation separation of acetone-butanol-ethanol (ABE) mixture is an indispensable energy-intensive unit to produce bio-based butanol from the abundant biomass resources via fermentation. Although numerous alternative distillation sequences were established for energy-intensive ABE separation, the instinct drawbacks of poor controllability and poor stability of the distillation processes still limited the realistic applications. In this work, dynamic model was established to evaluated the stability, and characteristics of two ABE distillation sequences that with recycled loops (scenario 1: the classic sequence, namely TCd loop;scenario 2: an energy-effective sequence, namely E-TCd loop) were compared. results indicated with the running of processes, ethanol was gradually cumulated in the TCd loop of scenario 1, leading to the increase of residual solvents concentration and cod in the waste stream, whilst much more stable ABE distillation can be realized in scenario 2. To further evaluate the controllability so that selected a more suitable control scheme of the scenario 2, a basic control structure (BCS) was constructed, and two improved control structures (ICS 1 and ICS 2) derived from BCS were also investigated. Among the candidate control structures, the ICS 2 exhibited better controllability with a lower integral of squared error (ISE) when ±10% disturbance occurs in feed. © 2024, The Authors. All rights reserved.

关键词： distillation

Open-Structured Silica Network Based on Silane-Terminated Telechelic Polybutadiene for Electric Vehicle Tires

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SSrN 2024年

作者： Lim, Kiwon Hong, Seung Jae Lee, Hyungjae Jung, Jaehyun Kim, Kihyun Park, Jong Hyuk Bang, Joona Department of Chemical and Biological Engineering Korea University 145 Anam-ro Seongbuk-gu Seoul02841 Korea Republic of R&D Center Hankook Tire and Technology Co. Ltd. 50 Yuseong-daero 935beon-gil Yuseong-gu Daejeon34127 Korea Republic of 5 Hwarang-ro 14-gil Seongbuk-gu Seoul02792 Korea Republic of

The transition from combustion engine vehicles to electric vehicles (EVs) is a critical step towards a sustainable future. EVs' increasing popularity poses challenges for tire makers, such as accommodating extra weight, managing instant torque, reducing noise, and improving driving range. Meeting these demands involves substantially reducing the rolling resistance of tire tread composites while simultaneously enhancing their mechanical stiffness and wear resistance. To overcome these issues, we introduce an open-structured silica network based on silane-terminated liquid-like telechelic polybutadienes in rubber composites. Our approach can improve the tan δ values at 60°C, indicating reduced rolling resistance, enhanced mechanical strength, and decreased abrasion losses compared to conventional composites. The internal structure of the proposed composites is characterized by X-ray computed tomography and transmission electron microscopy. A significant improvement in the micro-dispersion of silica clusters, without altering the macro-dispersion, is observed in the composites employing silane-terminated butadiene. This suggests the formation of an open-structured silica network with interstitial spaces between the aggregates. In this case, polymer chains permeate the interstices in the network, leading to a considerable reduction in the friction between particles. These findings offer highly suitable insights for developing tires tailored to the unique demands of EVs. © 2024, The Authors. All rights reserved.

关键词： Silica

Microscopic Molecular and Experimental Insights into Multi-Stage Inhibition Mechanisms of Alkylated Hydrate Inhibitor

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SSrN 2022年

作者： Liao, Bo Wang, Jintang Li, Mei-Chun Lv, Kaihe Wang, Qi Li, Jian Huang, Xianbing Wang, ren Lv, Xindi Chen, Zhangxin Sun, Jinsheng Shandong Qingdao266580 China Department of Chemical & Petroleum Engineering University of Calgary ABT2N 1N4 Canada CNPC Engineering Technology R&D Company Limited Beijing102206 China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and Engineering Nanjing Forestry University Nanjing210000 China Shandong Qingdao266580 China

The development of high-performance gas hydrate inhibitors for drilling fluids is of great significance for developing natural gas hydrates safely and efficiently. To improve the gas hydrate inhibition performance of a conventional gas inhibitor poly (vinyl pyrrolidone) (PVP), a random copolymer (SYZ-1) of N-vinyl pyrrolidone (NVP) and N, N-dimethyl acrylamide (dMAA) was synthesized, imparting abundant alkylated groups on the backbone of PVP. The results of experiments and molecular simulations illustrate that the mechanism of the inhibitors varies at different stages. The inhibitors retard hydrate formation by reducing the solubility of methane molecules in water during the nucleation phase. However, during the formation phase, the hydrate inhibition is achieved by adsorption. In particular, the absorption of PVP on the surface of hydrate can be effectively improved by alkylation, and the interaction energy of SYZ-1 with the hydrate nucleus was increased by 3.22 times compared to PVP. A molecular model for evaluating the interaction of inhibitors with hydrates is also successfully developed, which corresponds well to the experimental results. These results contribute to a better understanding of hydrate formation in drilling fluids and implications for developing new materials for high-performance hydrate drilling fluids. © 2022, The Authors. All rights reserved.

关键词： Alkylation

comparison between Microstrip-line and Substrate Integrated Waveguide on Package Substrate in 170 GHz and 300 GHz Bands

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Comparison between Microstrip-line and Substrate Integrated ...

Asia-Pacific conference on Microwave

作者： Yohei Morishita Ken Takahashi ryosuke Hasaba Tomohiro Murata Koji Takinami Hidenori Kitamura Ushio Sangawa Takashi Tomura Issei Watanabe Engineering Division Panasonic Industry Co. Ltd. Yokohama City Japan Technology Center Panasonic System Networks R&D Lab. Co. Ltd. Yokohama City Japan Electronic Materials Business Division Panasonic Industry Co. Ltd. Yokohama City Japan Department of Electrical and Electronic Engineering Tokyo Institute of Technology Yokohama City Japan Advanced ICT Research Institute National Institute of Information and Communications Technology Yokohama City Japan

ISBN: (数字)9784902339567

ISBN: (纸本)9781665451086

This paper studies a low loss transmission line structure for 100 GHz to 300 GHz, which is considered as terahertz bands for 6G. Transmission losses of the microstrip-line (MSL) and the substrate integrated waveguide (SIW) are discussed by theoretical calculations. The theoretical calculations predict the loss of the MSL can be lower than that of the SIW at the very high frequency like the terahertz bands. To confirm the prediction, the MSL and the SIW have been designed and fabricated on the package substrate. The measurement results show that the loss of the SIW is lower than that of the MSL at 170 GHz whereas the loss of the SIW is higher than that of the MSL at 300 GHz as predicted by the theoretical analysis.

关键词： Microwave measurement 6G mobile communication Power transmission lines Waveguide theory Propagation losses Transmission line measurements Loss measurement

SArS-coV-2-specific immune response in coVId-19 convalescent individuals

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Signal Transduction and Targeted Therapy 2021年第8期6卷 2484-2493页

作者： Yunbao Pan Xianghu Jiang Liu Yang Liangjun Chen Xiaojiao Zeng Guohong Liu Yueting Tang Chungen Qian Xinming Wang Fangming Cheng Jun Lin Xinghuan Wang Yirong Li Department of Laboratory Medicine Zhongnan Hospital of Wuhan UniversityWuhan UniversityWuhanHubeiChina Wuhan Research Center for Infectious Diseases and Cancer Chinese Academy of Medical SciencesWuhanChina Department of Radiology Zhongnan Hospital of Wuhan UniversityWuhan UniversityWuhanChina The Key Laboratory for Biomedical Photonics of MOE at Wuhan National Laboratory for Optoelectronics-Hubei Bioinformatics&Molecular Imaging Key Laboratory Systems Biology ThemeDepartment of Biomedical EngineeringCollege of Life Science and TechnologyHuazhong University of Science and TechnologyWuhanHubeiChina Reagent R&D Center Autobio Diagnostics Co.LtdZhengzhouHenanChina Reagent R&D Center Shenzhen YHLO Biotech Co.LtdShenzhenGuangdongChina Department of Gastroenterology Zhongnan Hospital of Wuhan UniversityWuhan UniversityWuhanChina Center for Evidence-Based and Translational Medicine Zhongnan Hospital of Wuhan UniversityWuhan UniversityWuhanChina Department of Urology Zhongnan Hospital of Wuhan UniversityWuhan UniversityWuhanChina

We collected blood from coronavirus disease 2019(coVId-19)convalescent individuals and investigated SArS-coV-2-specific humoral and cellular immunity in these discharged ***-up analysis in a cohort of 171 patients at 4-11 months after the onset revealed high levels of IgG antibodies.A total of 78.1%(164/210)of the specimens tested positive for neutralizing antibody(NAb).SArS-coV-2 antigen peptide pools-stimulated-IL-2 and-IFN-y response can distinguish coVId-19 convalescent individuals from healthy ***,NAb survival was significantly affected by the antigen peptide pools-stimulated-IL-2 response,-IL-8 response,and-IFN-y *** antigen peptide pools-activated Cd8+T cell counts were correlated with *** antigen peptide pools-activated natural killer(NK)cell counts in convalescent individuals were correlated with NAb and disease *** data suggested that the development of NAb is associated with the activation of T cells and NK *** work provides a basis for further analysis of the protective immunity to SArS-coV-2 and for understanding the pathogenesis of *** also has implications for the development of an effective vaccine for SArS-coV-2 infection.

关键词： immunity protective vaccine

Measurement and correction of Interface Shear Stiffness between Slab and Base for concrete Pavement

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International Journal of Pavement research and technology 2020年第2期13卷 138-144页

作者： Zhang, Yancong Gao, Lingling College of Highway Chang’an University Xi’anShaanxi710064 China Key lab of highway construction & maintenance technology in loess region Shanxi Transportation Technology R&D Co. Ltd. TaiyuanShanxi030032 China Department of Engineering Management Shanxi conservancy technical institute TaiyuanShanxi030027 China

Interface parameters could affect the adhesion and durability performance of cement concrete pavements. In order to improve the pavement performance, the interface shear stiffness between the slab and the base of concrete pavement were investigated accurately. A horizontal shear tester was developed which could simulate the vertical pressure. The bond-slip curve of the specimens that the interface treated by three different measures was determined, such as emulsified asphalt, geotextile and asphalt concrete. Then, the correction of interface vertical pressure was made for average shear stiffness based on simple iterative method, and the equivalent shear stiffness of three types of specimens was recommended. The results showed that the specimen treated by emulsified asphalt required the maximum shear force, and asphalt concrete was minimum during the static friction stage. The contact states between slab and base are significantly correlated with the interface treatments. So, the interface treatments selection needed to find a balance between flexural tensile stress and thermal stress of the slab. In the sliding friction stage, the shear resistances of three types of interface treatment methods were significantly weakened and the average shear stiffness declined dramatically. It is very different for interface shear stiffness when the pavement structure in different using stages. The interface parameter must consistent with the using state of the pavement during the analysis process of the pavement structure. © 2019, Higher Education Press Limited company.

关键词： Iterative methods

Structures, Thermal Stability and Electronic Characteristics of the Al-Sc Clusters

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SSrN 2022年

作者： Gao, Yongshun Jiao, Juanxia Meng, Ying Zhang, Manli Liu, Qiman Cheng, Longjiu School of Chemistry and Materials Engineering Huainan Normal University Huainan232000 China Science and Technology R&D Department Zhejiang Guanghan Technology Group Co. Ltd Hangzhou310000 China Key Laboratory of Structure and Functional Regulation of Hybrid Materials Anhui University Hefei230000 China

There are only two reports of the Al-Sc clusters currently available through the Google Scholar. Here, structure characteristics, thermal stability and electronic properties of (AlSc)n (n = 1-6) clusters are investigated using the GA-dFT method. The Au-Li clusters prefer spherical configurations involving singlet and triplet states. Among them, the highly symmetric C2v structure is the most stable for the (AlSc)3 cluster. The AIMd simulations show that the (AlSc)3 still has a good thermal stability at 700K. The molecular orbitals reveal that the (AlSc)3 has a completely filled superatomic shell (1S21P61d82S2). The total dOS of the (AlSc)3 comes from joint contributions of Al and Sc. The NPA charge shows that charge transfer occurs from the Sc to Al atoms. Moreover, the Infrared and raman spectroscopy are obtained to manifest structure details of the cluster. Our work can further provide beneficial inferences for larger sized Al-Sc clusters in the future. © 2022, The Authors. All rights reserved.

关键词： Charge transfer