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Influence of stearic acid surface modification on flowability and agglomeration of battery grade Li_(2)CO_(3)powder

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Particuology 2024年第9期92卷 263-277页

作者： Ming zhou Lithium Industry Center Zhejiang New Era Zhongneng Technology Co.Ltd.Shaoxing312000China

This work investigates the flow and agglomeration behaviors of battery grade Li_(2)CO_(3)powder and the influence of stearic acid surface *** degree of agglomeration is directly related to the uniformity of Li_(2)CO_(3)and its powder *** to the Chinese National Nonferrous Metal Industry Standard,battery grade Li_(2)CO_(3)powder has D50 equal to 3–8μm which belongs to a micron-sized superfine ***,with the extension of storage time,the serious agglomeration phenomenon occurs due to the large specific surface area and rough and irregular powder *** Hausner ratio(HR)of the unmodified sample increases from 1.14 to 1.41,and the corresponding flowability is classified as good to ***,among samples with doping stearic acid,the optimum amount of it is 0.10 wt%which exhibits an extremely stable HR value from 1.14 to ***,after 156 days,the repose angle(AR)obtained for samples without surface modification and using 0.10 wt%stearic acid are calculated to be 49°and 28°,*** on the values of HR and AR,the flowability of the unmodified sample is poor while the sample modified with 0.10 wt%of stearic acid still maintain excellent powder flow ***,The LiMn_(2)O_(4)cathode material synthesized from modified Li_(2)CO_(3)powder with a stearic acid content of 0.10 wt%exhibits good crystallinity and comparable electrochemical performance to that prepared by commercial Li_(2)CO_(3).These results indicate that stearic acid has the potential to be an ideal modifier for battery grade Li_(2)CO_(3)powder that needs to be kept for a long time.

关键词： Battery grade Li_(2)CO_(3)powder Flowability Surface modification Stearic acid

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生物传感器检测食品过敏原的研究进展

科技通报 2017年第11期33卷 6-10页

作者：叶璟周海鹰浙江省科技信息研究院杭州310006

食品过敏是一个世界性公共卫生问题。如何快速、灵敏、低成本、可靠地检测食品过敏原一直受到人们的关注。食品过敏原的检测可以分为蛋白质层面和核酸层面两大类技术。生物传感器因具有高灵敏度、微型化、低成本等优点,近年来成为食品... 详细信息

食品过敏是一个世界性公共卫生问题。如何快速、灵敏、低成本、可靠地检测食品过敏原一直受到人们的关注。食品过敏原的检测可以分为蛋白质层面和核酸层面两大类技术。生物传感器因具有高灵敏度、微型化、低成本等优点,近年来成为食品过敏原检测的研究焦点。本文对生物传感器在食品过敏原检测中的应用进行综述,并对今后的应用研究方向进行了初步探讨。

关键词：食品过敏原检测生物传感器

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“双碳”目标下的岸电减排决策研究

科技管理研究 2022年第11期42卷 229-235页

作者：周海英邓燕赟广州航海学院港口与航运管理学院广东广州510725

从供应链视角,利用博弈方法构建政府补贴政策下港口和船舶采用岸电减排的博弈模型,分析三种权力结构(船舶主导的Stackelberg博弈、港口主导的Stackelberg博弈、港口与船舶处于同等地位的Nash博弈)下的港口与船舶减排决策行为。结果表明... 详细信息

从供应链视角,利用博弈方法构建政府补贴政策下港口和船舶采用岸电减排的博弈模型,分析三种权力结构(船舶主导的Stackelberg博弈、港口主导的Stackelberg博弈、港口与船舶处于同等地位的Nash博弈)下的港口与船舶减排决策行为。结果表明,港口与船舶处于同等地位情形下的政府补贴最小,当岸电接电时间较短时一方处于主导地位(船舶主导和港口主导)的港航供应链整体利润最大,而当岸电接电时间较长时,港口与船舶处于平等地位的港航供应链整体利润最大;三种权力结构下的排放量和社会福利不变。

关键词：岸电博弈补贴

事务处理型容错计算机可用性评测系统设计与实现

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高技术通讯 2012年第9期22卷 912-917页

作者：冯懿左德承张展周海鹰杨孝宗哈尔滨工业大学计算机科学与技术学院哈尔滨150001

针对事务处理型容错计算机可用性测试中存在的目标系统数量少、测试时长有限的问题，设计了一种可用性评测方法，并实现了相应的可用性评测系统，用于评测事务处理型容错计算机的可用性指标。评测系统由多层次故障注入平台、模拟应用负... 详细信息

针对事务处理型容错计算机可用性测试中存在的目标系统数量少、测试时长有限的问题，设计了一种可用性评测方法，并实现了相应的可用性评测系统，用于评测事务处理型容错计算机的可用性指标。评测系统由多层次故障注入平台、模拟应用负载、可用性评测套件组成。多层次故障注入平台实现自动化故障注入，针对目标系统施加多批量、多种类故障负载；模拟应用负载能够针对目标系统施加事务处理型工作负载；可用性评测套件用于测试目标系统中各功能子系统和现场可更换部件（FRU）的可靠性连接关系，测试各类FRU的冗余程度，测试各类FRU的平均修复时间，以及测试验证目标系统是否满足指定的可用性设计要求。针对HP Superdome容错服务器进行的评测结果与官方文档一致，证明了该评测系统的有效性。本研究对于事务处理型容错计算机研制商预测系统可用性以及终端用户应用选型具有重要作用。

关键词：容错事务处理可用性评测故障注入

Controllable shaping of high-index dielectric nanoparticles by exploiting the giant optical force of femtosecond laser pulses

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Photonics Research 2024年第2期12卷 282-291页

作者： YUHENG MAO SHUWEN BAI MINGCHENG PANMAI LIDAN zhou SHIMEI LIU SHULEI LI haiying LIU HAIHUA FAN JUN DAI SHENG LAN Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510006China Shenzhen Institute of Terahertz Technology and Innovation Shenzhen 518102China State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510006China School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China

Nanoparticles made of different materials usually support optical resonances in the visible to near infrared spectral range,such as the localized surface plasmons observed in metallic nanoparticles and the Mie resonances observed in dielectric *** optical resonances,which are important for practical applications,depend strongly on the morphologies of *** irradiation is a simple but effective way to modify such optical resonances through the change in the morphology of a *** laser-induced shaping of metallic nanoparticles has been successfully demonstrated,it remains a big challenge for dielectric nanoparticles due to their larger Young’s modulus and smaller thermal ***,we proposed and demonstrated a strategy for realizing controllable shaping of high-index dielectric nanoparticles by exploiting the giant optical force induced by femtosecond laser *** was found that both Si and Ge nanoparticles can be lit up by resonantly exciting the optical resonances with femtosecond laser pulses,leading to the luminescence burst when the laser power exceeds a *** addition,the morphologies of Si and Ge nanoparticles can be modified by utilizing the giant absorption force exerted on them and the reduced Young’s modulus at high *** shape transformation from sphere to ellipsoid can be realized by laser irradiation,leading to the blueshifts of the optical *** was found that Si and Ge nanoparticles were generally elongated along the direction parallel to the polarization of the laser *** shaping of Si and Ge can be achieved by deliberately adjusting the excitation wavelength and the laser *** findings are helpful for understanding the giant absorption force of femtosecond laser light and are useful for designing nanoscale photonic devices based on shaped highindex nanoparticles.

关键词： optical polarization dielectric

离散奇异随机Markov跳变系统Stackelberg博弈及其应用

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南昌大学学报（理科版） 2022年第5期46卷 518-525页

作者：周海英罗震东周艳广州航海学院港口与航运管理学院广东广州510725 广东工业大学管理学院广东广州510630

应用配方法探讨一类离散奇异随机Markov跳变系统的Stackelberg博弈问题。分别得到有限时间和无限时间情形下,离散奇异随机Markov跳变系统Stackelberg策略的存在条件等价于相应的代数Riccati方程组存在解,并给出了Stackelberg均衡策略的... 详细信息

应用配方法探讨一类离散奇异随机Markov跳变系统的Stackelberg博弈问题。分别得到有限时间和无限时间情形下,离散奇异随机Markov跳变系统Stackelberg策略的存在条件等价于相应的代数Riccati方程组存在解,并给出了Stackelberg均衡策略的显式表达及最优性能泛函值。最后借鉴前人研究,将所得结果应用于离散奇异随机Markov跳变系统的H_(2)/H_(∞)控制问题,得到离散奇异随机Markov跳变系统的H_(2)/H_(∞)控制策略存在条件及其显式表达。

关键词：离散奇异随机Markov跳变系统 Stackelberg策略 Riccati方程

Perinatal and neonatal outcomes of 494 babies delivered from 972 vitrified embryo transfers

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Perinatal and neonatal outcomes of 494 babies delivered from...

Phase field modeling of ferroelastic variant switching in yttria-stabilized t'zirconia with strain gradient elasticity and interface tension

中华医学会第十次全国妇产科学术会议妇科内分泌会场（妇科内分泌学组、绝经学组、计划生育学组）

作者： Wenhao Shi Xia Xue Silin Zhang Wanqiu Zhao Shan Liu haiying zhou Min Wang Juanzi Shi Assisted Reproduction Center Maternal and Child Health Care Hospital of Shaanxi Province

Objective To evaluate the safety of vitrification of embryos by comparing the perinatal outcome of vitrified day 3 embryo transfers with fresh cleavage-stage embryo *** Supernumerary embryos and embryos of patients at risk of ovarian hyperstimulation syndrome(OHSS)were vitrified using a Cryotop carrier in an open system and were transferred after *** performed a total of 972 ET cycles with vitrified-warmed embryo in 806 patients between January 2008 and December *** the same period,a total of 1498 fresh

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Science China(Technological Sciences) 2024年第5期67卷 1443-1457页

作者： zhou QianQian WEI YueGuang zhou YiChun YANG Li College of Engineering BIC-ESATPeking UniversityBeijing100871China School of Advanced Materials and Nanotechnology Xidian UniversityXi’an710126China Frontier Research Center of Thin Films and Coatings for Device Applications Academy of Advanced Interdisciplinary ResearchXidian UniversityXi’an710126China

The 6–8 wt%yttria-stabilized zirconia with a tetragonal structure(t’-YSZ)is extensively employed in thermal barrier *** exceptional fracture toughness of t’-YSZ can be attributed to its distinctive ferroelastic toughening *** and interface tension play a critical role in ferroelastic variant switching at the micro-and *** paper presents an original thermodynamically consistent phase field(PF)theory for analyzing ferroelastic variant switching at the micro-and nano-scale of t’-*** theory incorporates strain gradient elasticity using higher-order elastic energy and interface tension tensor via geometric nonlinearity to represent biaxial tension resulting from interface ***,a mixed-type formulation is employed to implement the higher-order theory through the finite element *** an interface in equilibrium,the effects of strain gradient elasticity result in a more uniform distribution of stresses,whereas the presence of interface tension tensor significantly amplifies the stress magnitude at the *** introduction of an interface tension tensor increases the maximum value of stress at the interface by a factor of 4 to *** nucleation and evolution of variants at a pre-existing crack tip in a mono-phase t’-YSZ have also been *** strain gradient elasticity is capable of capturing the size effect of ferroelastic variant switching associated with microstructures in ***,when the grain size approaches that of the specimen,the critical load required for variant switching at the crack tip increases,resulting in greater dissipation of elastic energy during ferroelastic variant ***,the interface tension accelerates the evolution of *** presented framework exhibits significant potential in modeling ferroelastic variant switching at the micro-and nano-scale.

关键词： thermodynamics strain gradient elasticity interface tension phase field method ferroelastic variant switching

Deep-reinforcement-learning-based UAV autonomous navigation and collision avoidance in unknown environments

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Chinese Journal of Aeronautics 2024年第3期37卷 237-257页

作者： Fei WANG Xiaoping ZHU zhou zhou Yang TANG School of Astronautics Northwestern Polytechnical UniversityXi’an 710072China School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China

In some military application scenarios,Unmanned Aerial Vehicles(UAVs)need to perform missions with the assistance of on-board cameras when radar is not available and communication is interrupted,which brings challenges for UAV autonomous navigation and collision *** this paper,an improved deep-reinforcement-learning algorithm,Deep Q-Network with a Faster R-CNN model and a Data Deposit Mechanism(FRDDM-DQN),is proposed.A Faster R-CNN model(FR)is introduced and optimized to obtain the ability to extract obstacle information from images,and a new replay memory Data Deposit Mechanism(DDM)is designed to train an agent with a better *** training,a two-part training approach is used to reduce the time spent on training as well as retraining when the scenario *** order to verify the performance of the proposed method,a series of experiments,including training experiments,test experiments,and typical episodes experiments,is conducted in a 3D simulation *** results show that the agent trained by the proposed FRDDM-DQN has the ability to navigate autonomously and avoid collisions,and performs better compared to the FRDQN,FR-DDQN,FR-Dueling DQN,YOLO-based YDDM-DQN,and original FR outputbased FR-ODQN.

关键词： Faster R-CNN model Replay memory Data Deposit Mechanism(DDM) Two-part training approach Image-based Autonomous Navigation and Collision Avoidance(ANCA) Unmanned Aerial Vehicle(UAV)