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膨胀循环氢氧发动机低压火炬的点火能量研究

宇航总体技术 2024年第2期8卷 32-38页

作者：李锦江陈明航崔荣军张楠北京航天动力研究所北京100076 中国航天科技集团有限公司低温液体推进技术实验室北京100076

针对膨胀循环氢氧发动机多次点火需求,采用氢、氧推进剂吸热着火和火炬燃气降温放热的假设,用热力计算方法从理论上分析了推力室采用火炬点火的能量问题。在考虑火炬燃气与推力室内的氧补燃后,富燃低压火炬点火器的点火能量能够满足推... 详细信息

针对膨胀循环氢氧发动机多次点火需求,采用氢、氧推进剂吸热着火和火炬燃气降温放热的假设,用热力计算方法从理论上分析了推力室采用火炬点火的能量问题。在考虑火炬燃气与推力室内的氧补燃后,富燃低压火炬点火器的点火能量能够满足推力室点火需求。研制了2种低压火炬点火试验系统,对膨胀循环发动机进行了17次点火试验,试验结果与理论分析结果相符,验证了补燃点火假设。

关键词：膨胀循环发动机低压火炬式电点火点火能量

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以高效内训师体系打造企业动态核心竞争力

中国人力资源开发 2009年第10期26卷 21-24页

作者：崔荣军魏延军上海证券交易所

随着经济发展和市场竞争加剧,如何保证企业生存并实现可持续发展已成为管理者和学界最为关注的课题。本文阐述了通过构建基于隐含知识创造和积累的高效内训师开发管理体系,在企业内激发团队、全员开拓性学习和创新,来持续创造、传播、... 详细信息

随着经济发展和市场竞争加剧,如何保证企业生存并实现可持续发展已成为管理者和学界最为关注的课题。本文阐述了通过构建基于隐含知识创造和积累的高效内训师开发管理体系,在企业内激发团队、全员开拓性学习和创新,来持续创造、传播、积累企业专有隐含知识,并进而提升动态核心竞争力,获取长期竞争优势。

关键词：动态核心竞争力知识管理内部培训师

A review on numerical studies of airflow dynamics and particle deposition in human respiratory system Author links open overlay panel

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Particuology 2024年第8期91卷 351-377页

作者： Hao Jing Xinguang cui School of Aerospace Engineering Huazhong University of Science and TechnologyWuhan430074China

Accurate assessment and prediction of airflow dynamics and particle deposition in the human respiratory tract are essential for human health,involving inhaled drugs for treating various diseases and toxic particles that can cause *** intricate process involves complex multiphase flow with distinct respiratory *** fluid dynamics(CFD)acts as a bridge,overcoming the limitations of in vivo and in vitro experiments and providing a means to fully comprehend and reveal the fundamental mechanisms of respiratory flow and particle behavior on a microscopic *** paper provides a comprehensive overview and concise summary of recent advancements in the numerical simulation of airflow and particle deposition in the human respiratory ***,it summarizes the transition of respiratory tract models from segmented models to emerging physiological characteristic models and whole-lung airway models,and the latest developments on the effects of key factors such as geometric variations,respiratory patterns,and particle physical/chemical properties on respiratory flow and particle deposition.A notable focus of this review is on emerging physiological characteristics models and their associated complex airflow and particle dynamics inside *** paper concludes with recommendations for future research to further advance the development of this field.

关键词： Airflow dynamics Particle deposition Human respiratory system Numerical modeling

Multi-Sensor Fusion Adaptive Estimation for Nonlinear Under-observed System with Multiplicative Noise

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Chinese Journal of Electronics 2024年第1期33卷 282-292页

作者： Yongpeng cui Xiaojun SUN School of Electronic Engineering Heilongjiang University Key Laboratory of Information Fusion Estimation and Detection

The adaptive fusion estimation problem was studied for the multi-sensor nonlinear under-observed systems with multiplicative noise. A one-step predictor with state update equations was designed for the virtual state with virtual noise first of all. An extended incremental Kalman filter(EIKF) was then proposed for the nonlinear under-observed systems. Furthermore, an adaptive filtering method was given for optimization. The fusion adaptive incremental Kalman filter weighted by scalar was finally proposed. The comparison analysis was made to verify the optimization of the state estimation using adaptive filtering method in the filtering process.

关键词： Adaptive systems Information filters Matrices Adaptive estimation Kalman filters State estimation Nonlinear systems

Number of Solitons Emerged in the Initial Profile of Shallow Water Using Convolutional Neural Networks

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Journal of Systems Science & Complexity 2024年第2期37卷 463-479页

作者： WANG Zhen cui Shikun School of Mathematical Sciences Dalian University of TechnologyDalian 116024China School of Mathematical Sciences Beihang UniversityBeijing 100191China

The soliton resolution conjecture proposes that the initial value problem can evolve into a dispersion part and a soliton ***,the problem of determining the number of solitons that form in a given initial profile remains unsolved,except for a few specific *** this paper,the authors use the deep learning method to predict the number of solitons in a given initial value of the Korteweg-de Vries(KdV)*** leveraging the analytical relationship between Asech^(2)(x)initial values and the number of solitons,the authors train a Convolutional Neural Network(CNN)that can accurately identify the soliton count from spatio-temporal *** trained neural network is capable of predicting the number of solitons with other given initial values without any additional *** extensive calculations,the authors demonstrate the effectiveness and high performance of the proposed method.

关键词： Convolutional neural network deep learning method KdV equation soliton

Fbxw8 is involved in the proliferation of human prostate cancercells

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Fbxw8 is involved in the proliferation of human prostate can...

“Buckets effect”in the kinetics of electrocatalytic reactions

中国生物化学与分子生物学会第十一次会员代表大会暨2014年全国学术会议

作者： Ping Lin Feng Lin Xiulan Zheng Haifeng Zou Hui Chen rongjun cui Jiebing Tang Xiaoguang Yu Department of Biochemistry and Molecular Biology College of Basic Medical Science Harbin Medical University Department of Diagnosis Harbin Medical University Cancer Hospital Harbin Medical University

Background: Ubiquitin–proteasome pathway plays indispensable roles in many biologicalprocesses. The protein ubiquitination is catalyzed by three enzymes, the E1 ubiquitin activatingenzyme, the E2 ubiquitin conjugating enzymes, and the E3 ubiquitin ligases. TheSkp1–CUL1–F-box(SCF) multi-subunit complex is a well characterized E3 ligase, Skp1 canalso form an E3 complex with CUL7, Rbx1, and F-box and WD repeat domain containing 8(Fbxw8), which is the only known F-box protein in CUL7 E3 complex. Fbxw8 has been involvedin the proteasomal degradation of insulin receptor substrate 1(IRS-1), and it also plays an essential role in the proliferation of colon cancer cells via proteolysis of cyclin *** the present study, we evaluated the effects of Fbxw8 on the proliferation and on the cellcycle distribution of human prostate cancer cells. Results: We firstly examined the expression levels of Fbxw8 in six human prostate cancer cell lines, and we found the expression of Fbxw8 is much higher in DU145 cells compare to PC-3 cells. Knock-down Fbxw8 by siRNA significantly inhibited DU145 cells proliferation and the G2/M transition in cell cycle,which is mediated by down-regulation of CDK1, CDK2, cyclin A and cyclin B1 at protein level in association with induction of p27. Stable over-expression of Fbxw8 induced PC-3cells proliferation and G2/M cell cycle transition through up-regulation of CDK1, CDK2,cyclin A and cyclin B1 and down regulation of p27. Conclusions: In summary, Fbxw8 regulated cell proliferation and promoted cell cycle progression, which may be achieved by increasing the expressions of CDK1, CDK2, cyclin A and cyclin B1 as well as decreasing the expressions of P27. We also showed that Fbxw8 might be a potential target for prostate cancer prevention and therapy.

关键词： Fbxw8 PCa Cell proliferation Cell cycle

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Journal of Energy Chemistry 2024年第2期89卷 388-396,I0010页

作者： Haowen cui Yan-Xia Chen Hefei National Laboratory for Physical Sciences at Microscale Department of Chemical PhysicsUniversity of Science and Technology of ChinaHefei 230026AnhuiChina

In this study,we systematically investigated the effect of proton concentration on the kinetics of the oxygen reduction reaction(ORR)on Pt(111)in acidic *** results demonstrate a rectangular hyperbolic relationship,i.e.,the ORR current excluding the effect of other variables increases with proton concentration and then tends to a constant *** consider that this is caused by the limitation of ORR kinetics by the trace oxygen concentration in the solution,which determines the upper limit of ORR kinetics.A model of effective concentration is further proposed for rectangular hyperbolic relationships:when the reactant concentration is high enough to reach a critical saturation concentration,the effective reactant concentration will become a constant *** could be due to the limited concentration of a certain reactant for reactions involving more than one reactant or the limited number of active sites available on the *** study provides new insights into the kinetics of electrocatalytic reactions,and it is important for the proper evaluation of catalyst activity and the study of structureperformance relationships.

关键词： Oxygen reduction reaction Kinetics Zero order Rectangular hyperbolic relationship pH effect

Nano-effect enhanced cooperative luminescence of Yb^(3+) clusters in bulk materials

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Journal of Rare Earths 2024年第3期42卷 473-478,I0002页

作者： Daguang Li Jiahao cui Yanhui Dong Hao cui Dan Zhao Weiping Qin State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun130012China

In order to improve the multi-ion cooperative transition, we proposed and exploited a novel nanoscale effect, namely the nanoshell effect in bulk materials. Based on the effect, an optimal material structure was designed by coating the surfaces of Ca F_(2):Yb^(3+)micron size particles with ZrO_(2). An about 2 times higher intensity of cooperative luminescence is observed upon laser excitation at 980 nm. Dynamical analysis exhibits that the novel effect plays a key role in improving the performance of cooperative transitions. Our results also suggest that the nanoshell effect in bulk materials is likely to be significant in some special cases, which have not been reported yet in the literature.

关键词： Yb^(3+)cluster ZrO_(2) Nanoshell Enhancement Cooperative luminescence Rare earths

Influence of ammonium sulfate on the corrosion behavior of AZ31 magnesium alloy in chloride environment

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Journal of Magnesium and Alloys 2024年第3期12卷 1082-1101页

作者： Feng Ge Zhongyu cui Yue Liu Li Lei Xin Wang Hongzhi cui School of Materials Science and Engineering Ocean University of ChinaQingdao 266100China Beijing National Innovation Institute of Lightweight Ltd.Beijing 101499China

Electrochemical corrosion of AZ31 magnesium alloy in the NH_(4)^(+)-SO_(4)2−-Cl−environment is *** of NH_(4)^(+)overshadows that of Cl−as the(NH_(4))_(2)SO_(4) concentration is 0.005 M or higher,yielding an evolution from localized corrosion to uniform *** effect of NH_(4)^(+)can be attributed to that(i)NH_(4)^(+)dissolves the inner MgO and hinders the precipitation of Mg(OH)_(2) and(ii)the buffering ability of NH_(4)^(+)provides H+,enhances the hydrogen evolution,and expedites the corrosion *** latter is demonstrated as the dominant factor with the results in unbuffered and buffered *** severe corrosion and hydrogen process in NH_(4)^(+)-containing solution results in a high Hads coverage and yields an inductive loop within the low ***,SO_(4)^(2−)is helpful in generating cracked but partially protective corrosion products,while Cl−could broaden the corrosion area beneath the corrosion product.

关键词： Magnesium alloy Ammonium corrosion Electrochemical kinetic parameter Anodic dissolution.