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Index allocation for a reusable LOX/CH4 rocket engine

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Chinese Journal of Aeronautics 2021年第2期34卷 432-440页

作者： Yi LI Jie FANG bing sun Kaiyang LI Guobiao CAI School of Astronautics Beihang UniversityBeijing 100083China Key Laboratory of Spacecraft Design Optimization and Dynamic Simulation Technologies(Beihang University) Ministry of EducationBeijing 100083China

Reusable rocket engines are the core components of reusable launch vehicles, and have thus become a major focus of aerospace engineering research in recent years. In practice, subsystem design is based on the overall index allocation of an engine;therefore, a multidisciplinary optimization approach is necessary. In this study, design of a reusable methane/liquid oxygen(LOX/CH4)rocket engine with a gas generator cycle was investigated using multidisciplinary optimization. Two parameters were chosen as design variables: pressure and fuel mix ratio of the main combustion chamber. Optimization objectives were specific impulse, structural mass, and life cycle cost of the reusable rocket engine, and constraints were assigned to each discipline according to rocket design requirements. Then, an optimization model was developed, and optimal design parameters were acquired for the LOX/CH4 rocket engine. The proposed method is effective for designing the index allocation of reusable rocket engines and takes into account the multidisciplinary nature of complex systems.

关键词： Index allocation Mass model Multidisciplinary optimization Reliability Rocket engines

Electrolyte Solvation Structure Design for High Voltage Zinc-Based Hybrid Batteries

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Energy & Environmental Materials 2023年第4期6卷 239-247页

作者： Pauline Jaumaux Shijian Wang Shuoqing Zhao bing sun Guoxiu Wang Centre for Clean Energy Technology School of Mathematical and Physical SciencesFaculty of ScienceUniversity of Technology SydneyUltimo NSW 2007Australia

Zinc(Zn)metal anodes have enticed substantial curiosity for large-scale energy storage owing to inherent safety,high specific and volumetric energy capacities of Zn metal ***,the aqueous electrolyte traditionally employed in Zn batteries suffers severe decomposition due to the narrow voltage stability ***,we introduce N-methylformamide(NMF)as an organic solvent and modulate the solvation structure to obtain a stable organic/aqueous hybrid electrolyte for high-voltage Zn *** is not only extremely stable against Zn metal anodes but also reduces the free water molecule availability by creating numerous hydrogen bonds,thereby accommodating high-voltage Zn‖LiMn_(2)O_(4)*** introduction of NMF prevented hydrogen evolution reaction and promoted the creation of an Frich solid electrolyte interphase,which in turn hampered dendrite growth on Zn *** Zn‖LiMn_(2)O_(4)full cells delivered a high average Coulombic efficiency of 99.7%over 400 cycles.

关键词： aqueous electrolytes electrolyte solvation structures high-voltage zinc batteries hybrid batteries

Characteristics of gas-liquid diaphragm discharge and its application on decolorization of brilliant red B in aqueous solution

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Plasma Science and Technology 2017年第11期19卷 31-37页

作者： Qingsong GAO Yongjun LIU bing sun College of Environmental Science ＆ Engineering Dalian Maritime University Dalian 116026 People＇s Republic of China

A simple gas-liquid diaphragm discharge reactor was designed and characteristics of the discharge and its application on decolorization of brilliant red B in an aqueous solution were investigated. The results showed that strong oxidizing agents such as ·OH and ·O radicals were generated. Average electron temperature of the discharge was 0.72 eV, 1.15 eV and 0.83 eV with air, oxygen and argon as the discharge gas, respectively. Solution p H and conductivity changed little when oxygen or argon was used as the discharge gas; however, these two parameters changed significantly when the discharge was performed in air. During the discharge treatment,the characteristic absorption peaks of brilliant red B gradually decreased where the decolorization followed the first-order kinetics. With 10 min of discharge, the decolorization of brilliant red B（30 mg L^-1） can reach 96%, 81% and 62% in the cases of oxygen, argon and air,respectively. The analysis of by-products showed that the brilliant red B molecule can be effectively destroyed in this discharge mode.

关键词： gas-liquid diaphragm discharge brilliant red B decolorizafion

Application of the condenser lens in microwave hyperthermia

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Science China(Technological Sciences) 2011年第1期54卷 237-243页

作者： sun bing JIANG GuoTai CHEN ZhiHong WANG Li School of Electronics and Information Soochow University Suzhou 215006 China School of Life Sciences and Technology Tong/i University Shanghai 200092 China

According to the aplanatism theory, lens can be used to focus the electromagnetic wave. A piano-convex hyperboloid of revo- lution lens made of low loss material is designed for combinatorial applications with the rectangle microstrip applicator in microwave hyperthermia. Results of the extensive simulations and experiments show that the introduction of the lens to the clinical used antenna can significantly improve the directivity and hence increase the microwave power density in near field. In microwave hyperthermia applications, the lens antenna will exhibit superior directivity, high gain and well thermal efficiency for tumor in superficial layer. Besides, it has small treatment area that is helpful for reducing the injury of the normal tissue around the tumor.

关键词： condenser lens microwave hyperthermia lens antenna

High-resolution palmprint minutiae extraction based on Gabor feature

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Science China(Information Sciences) 2014年第11期57卷 85-99页

作者： FENG JuFu LIU ChongJin WANG Han sun bing Key Laboratory of Machine Perception (Ministry of Education) Department of Machine IntelligenceSchool of Electronics Engineering and Computer Science Peking University

Extracting effective minutiae is difficult for high-resolution palmprint, because of the strong influence from principal lines, creases, and other noises. In this paper, a novel minutiae detection and reliability measurement method is proposed for high-resolution palmprint minutiae extraction. Firstly, we propose the Gabor Amplitude-Phase model for palmprint representation, which contains sufficient palmprint information and consists of the phase field and amplitude field. Because of the explicit meanings of minutiae in phase field,a minutiae descriptor is constructed to detect them directly. Also, to measure minutiae reliability and remove the unreliable ones, the Gabor Amplitude-Phase feature vector is designed. It can be used for describing the local area of a minutia redundantly. Then, the Adaboost algorithm is introduced in model training to select best features and corresponding weak classifiers for minutiae authenticity discriminant. Finally, the response value of weighted linear combination of selected weak classifiers is used for minutiae reliability measurement and unreliable ones removal. According to our analysis, the selected features are meaningful and useful for describing the minutiae area and measuring their reliability. Experimental results show that our proposed method is effective for minutiae extraction and can improve the matching performance.

关键词： palmprint recognition minutiae extraction minutiae reliability measurement Adaboost algo-rithm Gabor filter

Challenges and R&D opportunities of smart distribution grids in China

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Science China(Technological Sciences) 2014年第8期57卷 1588-1593页

作者： YU YiXin ZENG Yuan LIU Hong sun bing Key Laboratory of Smart Grid of Ministry of Education Tianjin University

In this paper,5 investigations on the current states of power distribution grids in China have been introduced that cover the surveys of the practical distribution asset utilization,the simultaneity factor of feeder loading,the load compositions and characteristics,the urban reliability and the integration of distributed generations of renewable *** on the survey results in the investigations,12 Facts are clearly *** shows that the challenges to modernize the distribution grids in China are to improve the asset utilization rates,the electricity efficiencies and the reliability of distribution systems,as well as to integrate increasing amount of variable distributed renewable *** based on the challenges,8 R&D opportunities have been identified.

关键词： asset utilization distributed generation power distribution reliability R&D opportunities smart grid surveys

Jigsaw puzzle of SARS-CoV-2 RBD evolution and immune escape

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Cellular & Molecular Immunology 2022年第7期19卷 848-851页

作者： Chunyan Yi Xiaoyu sun Zhiyang Ling bing sun State Key Laboratory of Cell Biology Shanghai Institute of Biochemistry and Cell BiologyCenter for Excellence in Molecular Cell ScienceChinese Academy of SciencesUniversity of Chinese Academy of SciencesShanghai 200031China School of Life Science and Technology ShanghaiTech University100 Haike RoadShanghai 201210China

The outbreak of severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),which causes coronavirus disease 2019(COVID-19),has posed a tremendous threat to global health,resulting in over 510 million infections and at least 6.23 million deaths worldwide as of early May *** efforts to fight against the SARS-CoV-2 pandemic have accelerated the research and clinical development of various vaccines and neutralizing antibodies(NAbs)[1,2].However,SARS-CoV-2 has an exceptional ability to mutate and evade the human immune system,which highlights the surveillance of SARS-CoV-2 evolution to anticipate and facilitate a timely response to new variants that could impact viral transmissibility and the efficacy of vaccines and antibody therapies[3].

关键词： acute respiratory evolution

橘绿木霉GF-11发酵刺梨渣的响应面法优化

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中国生物防治学报 2024年第2期40卷 448-457页

作者：杨昌发唐彩艳孙冰张锐费正林葛永怡贵州大学生命科学学院/农业生物工程研究院/山地植物资源保护与种质创新教育部重点实验室贵阳550025

木霉具有抑制病原菌、促进植物生长和改善土壤营养等作用。刺梨渣是刺梨榨汁后的废弃物,具有极高的利用价值。本文拟采用刺梨渣为原料,麸皮为辅料进行固体发酵,以橘绿木霉GF-11的分生孢子数量为筛选指标,通过Plackett-Burman试验设计及B... 详细信息

木霉具有抑制病原菌、促进植物生长和改善土壤营养等作用。刺梨渣是刺梨榨汁后的废弃物,具有极高的利用价值。本文拟采用刺梨渣为原料,麸皮为辅料进行固体发酵,以橘绿木霉GF-11的分生孢子数量为筛选指标,通过Plackett-Burman试验设计及Box-Behnken设计-响应曲面法(responsesurface methodology,RSM)对影响发酵刺梨渣的条件进行优化。结果表明,培养基配方中对橘绿木霉GF-11产孢影响最显著的3个主要因素麸皮占比、接种量、发酵天数。优化后的发酵培养条件为麸皮占比61%、接种量10.48%、硫酸锌0.5%、含水率250%、发酵天数10d。在此优化条件下发酵获得橘绿木霉菌株GF-11的分生孢子产量为2.32×10^(10)CFU/g。该研究为刺梨渣发酵提供了合适的工艺条件,为减少刺梨渣污染环境及其有效利用提供了基础,也为生产高质量生物有机肥提供了新的途径。

关键词：橘绿木霉固体发酵响应面法刺梨渣

血必净注射液联合地塞米松治疗重症脓毒症的临床研究

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现代药物与临床 2024年第6期39卷 1524-1528页

作者：罗艳蒋昌华舒艾娅吴成芳孙兵简万均重庆大学附属涪陵医院重症医学科重庆408000 重庆大学附属涪陵医院病理科重庆408000

目的探讨血必净注射液联合地塞米松磷酸钠注射液治疗重症脓毒症的临床疗效。方法选取2023年1~12月重庆大学附属涪陵医院收治的66例重症脓毒症患者临床资料,根据用药方案不同分为对照组和治疗组,各33例。对照组静脉滴注地塞米松磷酸钠注... 详细信息

目的探讨血必净注射液联合地塞米松磷酸钠注射液治疗重症脓毒症的临床疗效。方法选取2023年1~12月重庆大学附属涪陵医院收治的66例重症脓毒症患者临床资料,根据用药方案不同分为对照组和治疗组,各33例。对照组静脉滴注地塞米松磷酸钠注射液,10 mg地塞米松注射液与250 m L 5%葡萄糖混合,1次/d。治疗组在对照组基础上静脉滴注血必净注射液,100 mL血必净注射液与250 mL 5%葡萄糖混合,2次/d。两组共治疗1周。比较两组临床疗效、临床症状改善时间、疾病严重程度、血清炎症因子。结果治疗后,治疗组的总有效率为90.91%,高于对照组总有效率63.64%(P<0.05)。治疗后,治疗组完成复苏时间、血压复常时间、体温恢复时间均短于对照组(P<0.05)。治疗后,两组急性生理学与慢性健康状况评价系统Ⅱ(APACHEⅡ)评分均低于治疗前(P<0.05),且治疗组患者的APACHEⅡ评分低于对照组(P<0.05)。治疗后,两组血清白细胞介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、C反应蛋白(CRP)水平均低于治疗前(P<0.05),且治疗组血清CRP、IL-6、TNF-α水平低于对照组(P<0.05)。结论重症脓毒症采用血必净注射液联合地塞米松磷酸钠注射液治疗的疗效显著,可缩短患者临床症状改善时间,降低患者病情严重程度和炎症水平。

关键词：血必净注射液地塞米松磷酸钠注射液重症脓毒症完成复苏时间血压复常时间体温恢复时间 APACHEⅡ评分白细胞介素-6 肿瘤坏死因子-α C反应蛋白