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An untethered cable-driven ankle exoskeleton with plantarflexion-dorsiflexion bidirectional movement assistance

Frontiers of Information Technology & Electronic Engineering 2020年第5期21卷 723-739页

作者： Tian-miao WANG Xuan PEI Tao-gang HOU Yu-bo FAN Xuan yang Hugh MHERR xing-bang yang School of Mechanical Engineering and Automation Beihang UniversityBeijing 100083China Shenyuan Honors College Beihang UniversityBeijing 100083China School of Biological Science and Medical Engineering Beihang UniversityBeijing 100083China MIT Media Lab Massachusetts Institute of TechnologyCambridgeMA 02139-4307USA Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100083China

Lower-limb assisted exoskeletons are widely researched for movement assistance or rehabilitation *** to advantages of compliance with human body and lightweight,some cable-driven prototypes have been developed,but most of these can assist only unidirectional *** this paper we present an untethered cable-driven ankle exoskeleton that can achieve plantarflexion-dorsiflexion bidirectional motion bilaterally using a pair of single *** main weights of the exoskeleton,i.e.,the motors,power supplement units,and control units,were placed close to the proximity of the human body,i.e.,the waist,to reduce the redundant rotation inertia which would apply on the wearer’s leg.A cable force transmission system based on gear-pulley assemblies was designed to transfer the power from the motor to the end-effector effectively.A cable self-tension device on the power output unit was designed to tension the cable during *** gait detection system based on a foot pressure sensor and an inertial measurement unit(IMU)could identify the gait cycle and gait states *** validate the power output performance of the exoskeleton,a torque tracking experiment was *** the subject was wearing the exoskeleton with power on,the muscle activity of the soleus was reduced by 5.2%compared to the state without wearing the *** preliminarily verifies the positive assistance effect of our *** study in this paper demonstrates the promising application of a lightweight cable-driven exoskeleton on human motion augmentation or rehabilitation.

关键词： Ankle exoskeleton Plantarflexion-dorsiflexion bidirectional assistance Biological gait torque Cable-driven Gait detection

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Acetylene/argon mixture plasma to build ultrathin carbon bridge of CF_(x)/C/MnO_(2) for high-rate lithium primary battery

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Rare Metals 2024年第6期43卷 2574-2584页

作者： Da-Wei Zou xing-Guang Fu Gao-bang Chen Yi-Fan Liu Bao-Shan Wu Xian Jian School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 31300lChina

Forming an ultrathin conducting layer on a fluorinated carbon(CFx)surface for reducing severe electrochemical polarization in lithium/fluorinated carbon primary batteries(Li/CF_(x))remains a considerable challenge for achieving batteries with excellent rate ***,CFxwas modified by using acetylene/argon mixture plasma combined with MnO_(2)*** CF_(x)/C/MnO_(2)composite effectively reduced the voltage hysteresis and improved the electrochemical performance of Li/CF_(x).The excellent rate performance of CF_(x)/C/MnO_(2)was due to the high electrochemical activity provided by the atomicscale conductive carbon layer and ultrafine MnO_(2)*** with pristine CF_(x),the charge transfer resistance of the optimized CF_(x)/C/MnO_(2)decreased from 218.5 to 48.2Ω,the discharge rate increased from 2C to 10C,and the power density increased from 3.11 to 13.44 kW·g^(-1),The intrinsic reason for the enhanced rate performance was attributed to the fact that the ultrathin carbon layer acted as a conductive bridge to reduce the voltage hysteresis at the initial stage of the Li/CF_(x)discharge,and the high electrochemical activity of the ultrafine MnO_(2)particles provided a faster lithium-ion diffusion rate.

关键词： C_(2)H_(2)/Ar plasma Fluorinated carbon Lithium primary battery MnO_(2)

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Simultaneous Bulk-and Surface-initiated Living Polymerization Studied with a Heterogeneous Stochastic Reaction Model

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Chinese Journal of Polymer Science 2024年第3期42卷 364-372,I0008页

作者： Jia-Shu Ma Zhi-Ning Huang Jia-Hao Li bang-Ping Jiang Yan-Da Liao Shi-Chen Ji xing-Can Shen State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources(Ministry of Education of China)School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004China School of Computer Science and Engineering&School of Software Guangxi Normal UniversityGuilin 541004China

To better characterize the properties of surface-initiated polymers, simultaneous bulk-and surface-initiated polymerizations are usually carried out by assuming that the properties of the surface-initiated polymers resemble those of the bulk-initiated polymers. Through a Monte Carlo simulation using a heterogeneous stochastic reaction model, it was discovered that the bulk-initiated polymers exhibit a higher molecular weight and a lower dispersity than the corresponding surface-initiated polymers, which indicates that the equivalent assumption is invalid. Furthermore, the molecular weight distributions of the two types of polymers are also different, suggesting different polymerization mechanisms. The results can be simply explained by the heterogeneous distributions of reactants in the system. This study is helpful to better understand surface-initiated polymerization.

关键词： Surface-initiated polymerization Polymer brush Stochastic reaction model Heterogeneous polymerization Simultaneous polymerization

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KAT7/HMGN1 signaling epigenetically induces tyrosine phosphorylation-regulated kinase 1A expression to ameliorate insulin resistance in Alzheimer’s disease

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World Journal of Psychiatry 2024年第3期14卷 445-455页

作者： Qun-Shan Lu Lin Ma Wen-Jing Jiang xing-bang Wang Mei Lu Department of Geriatric Medicine Qilu Hospital of Shandong UniversityJinan 250012Shandong ProvinceChina Key Laboratory of Cardiovascular Proteomics of Shandong Province Qilu Hospital of Shandong UniversityJinan 250012Shandong ProvinceChina

BACKGROUND Epidemiological studies have revealed a correlation between Alzheimer’s disease(AD)and type 2 diabetes mellitus(T2D).Insulin resistance in the brain is a common feature in patients with T2D and ***7 is a histone acetyltransferase that participates in the modulation of various *** To determine the effects of KAT7 on insulin patients with *** APPswe/PS1-dE9 double-transgenic and db/db mice were used to mimic AD and diabetes,*** in vitro model of AD was established by Aβ*** resistance was induced by chronic stimulation with high insulin *** expression of microtubule-associated protein 2(MAP2)was assessed using *** protein levels of MAP2,Aβ,dual-specificity tyrosine phosphorylation-regulated kinase-1A(DYRK1A),IRS-1,p-AKT,total AKT,p-GSK3β,total GSK3β,DYRK1A,and KAT7 were measured via western *** of reactive oxygen species(ROS),malondialdehyde(MDA),and SOD activity was measured to determine cellular oxidative *** cytometry and CCK-8 assay were performed to evaluate neuronal cell death and proliferation,*** RNA levels of KAT7 and DYRK1A were examined using quantitative PCR.A chromatin immunoprecipitation assay was conducted to detect H3K14ac in *** KAT7 expression was suppressed in the AD *** of KAT7 decreased Aβaccumulation and MAP2 expression in AD ***7 overexpression decreased ROS and MDA levels,elevated SOD activity in brain tissues and neurons,and simultaneously suppressed neuronal ***7 upregulated levels of p-AKT and p-GSK3βto alleviate insulin resistance,along with elevated expression of ***7 depletion suppressed DYRK1A expression and impaired H3K14ac of ***1 overexpression recovered DYRK1A levels and reversed insulin resistance caused by KAT7 *** We determined that KAT7 overexpression recovered insulin sensitivity in AD by recruiting HMGN1 to enhance DYRK1A acetylati

关键词： Alzheimer's disease Diabetes Insulin resistance KAT7 Dual-specificity tyrosine phosphorylation-regulated kinase-1A HMGN1

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Enhancing thermoelectric performance of p-type SnTe through manipulating energy band structures and decreasing electronic thermal conductivity

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Rare Metals 2024年第7期43卷 3232-3241页

作者： Xin Qian Hao-Ran Guo Jia-Xin Lyu bang-Fu Ding xing-Yuan San Xiao Zhang Jiang-Long Wang Shu-Fang Wang Hebei Key Lab of Optic-Electronic Information and Materials College of Physics Science and TechnologyHebei UniversityBaoding 071002China College of Electron and Information Engineering Hebei UniversityBaoding 071002China Research Institute for Frontier Science Beihang UniversityBeijing100191China

SnTe has received considerable attention as an environmentally friendly alternative to the representative thermoelectric material of ***,excessive hole carrier concentration in SnTe results in an extremely low Seebeck coefficient and high thermal conductivity,which makes it exhibit relatively inferior thermoelectric *** this work,the thermoelectric performance of p-type SnTe is enhanced through regulating its energy band structures and reducing its electronic thermal conductivity by combining Bi doping with CdSe ***,the carrier concentration of SnTe is successfully suppressed via Bi doping,which significantly decreases the electronic thermal ***,the convergence and flattening of the valence bands by alloying CdSe effectively improves the effective mass of SnTe while restraining its carrier ***,a maximum figure of merit(ZT) of~ 0.87 at 823 K and an average ZT of~ 0.51 at 300-823 K have been achieved in Sn_(0.96)Bi_(0.04)Te-5%*** results indicate that decreasing the electronic thermal conductivity is an effective means of improving the performance of thermoelectric materials with a high carrier concentration.

关键词： Thermoelectric materials SnTe Energy band structure Electronic thermal conductivity ZT value

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CFD modeling of gas−liquid flow phenomenon in lead smelting oxygen-enriched side-blown furnace

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Transactions of Nonferrous Metals Society of China 2024年第8期34卷 2671-2685页

作者： Zhen-yu ZHU Ping ZHOU xing-bang WAN Zhuo CHEN Ling ZHANG Shi-bo KUANG School of Energy Science and Engineering Central South UniversityChangsha 410083China Changsha Design and Research Institute of Nonferrous Metallurgy Changsha 410019China ARC Research Hub for Computational Particle Technology Department of Chemical EngineeringMonash UniversityWellington RdClaytonVIC 3800Australia

A validated numerical model was established to simulate gas−liquid flow behaviors in the oxygen-enriched side-blown bath *** model included the slip velocity between phases and the gas thermal expansion *** modeling results were verified with theoretical correlations and experiments,and the nozzle-eroded states in practice were also involved in the *** comparison,it is confirmed that the thermal expansion effect influences the flow pattern significantly,which may lead to the backward motion of airflow and create a potential risk to production ***,the influences of air injection velocity and furnace width on airflow behavior were investigated to provide operating and design *** is found that the thin layer melt,which avoids high-rate oxygen airflow eroding nozzles,shrinks as the injection velocity increases,but safety can be guaranteed when the velocity ranges from 175 to 275 m/***,the isoline patterns and heights of thin layers change slightly when the furnace width increases from 2.2 to 2.8 m,indicating that the furnace width shows a limited influence on production safety.

关键词： multiphase flow horizontal gas injection backward motion of airflow gas thermal expansion side-blown furnace lead smelting

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1,6-Conjugate addition of para-quinone methides using gem-diborylcarbanions: Practical access to gem-diborylalkanes bearing vicinal tertiary/quaternary stereocenters

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Green Synthesis and Catalysis 2024年第1期5卷 68-72页

作者： Pu-Zhang Zi xing-bang Liu Quan-Hong Zhao Min He Yuan Huang Department of Medicinal Chemistry School of PharmacyXi'an Jiaotong UniversityXi'an710061China

A novel,efficient and pragmatic method to prepare gem-diboron products with vicinal tertiary/quaternary stereocenters using LiTMP-mediated 1,6-conjugate addition of gem-diborylalkanes to para-quinone methides was described for the first *** results showed that various gem-diboron products with vicinal tertiary and quaternary stereocenters could be formed within 15 min at ambient *** simple protocol has also been applied for the efficient synthesis of the analogue of Bedaquiline.

关键词： gem-Diborylalkanes Quaternary stereocenter Conjugate addition para-Quinone methides Organoboron compounds

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中国电影海外传播平台传播效果研究——2023年度中国电影国际传播调研报告

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现代传播（中国传媒大学学报） 2024年第1期46卷 39-48页

作者：黄会林郭星儿蒋正邦北京师范大学北京师范大学中国文化国际传播研究院人民出版社北京师范大学艺术与传媒学院

2023年“中国电影国际传播”调研延续“以外国受众为调研对象、以中国电影国际传播为核心指向”的调研目标。调研以2020—2022年中国电影在海外传播平台上的整体表现为样本,从媒体关注度、社交平台表现、二次传播效果、意见领袖效能等... 详细信息

2023年“中国电影国际传播”调研延续“以外国受众为调研对象、以中国电影国际传播为核心指向”的调研目标。调研以2020—2022年中国电影在海外传播平台上的整体表现为样本,从媒体关注度、社交平台表现、二次传播效果、意见领袖效能等方面出发,全面评估2020—2022年间,中国电影在海外网络的传播效果。调研结果显示,2020—2022年因全球社交隔离等原因,中国电影海外平台传播效果好于之前年份;要重视YouTube意见领袖影响效能;境外媒体整体对中国电影的报道较为积极;Letterboxd、TMDB等专业平台对影片热度有较大影响;Twitter普通群体对民生问题电影关注较多、粉丝超过1千万群体对中国动画电影关注较多。在此基础上提出,应重新建立中国电影海外传播评价体系、发挥中华文化主体性等加快“十四五”期间电影文化强国建设的方案与路径。

关键词：中国电影国际传播海外网络传播评价体系中华文化主体性

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基于K-means聚类和极限学习机组合算法的短期光伏功率预测

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水电能源科学 2024年第2期42卷 217-220,216页

作者：黄牧涛邢芳菲陈兴邦卢明华中科技大学电气与电子工程学院湖北武汉430074 华中科技大学土木与水利工程学院湖北武汉430074 国网河南省电力公司电力科学研究院河南郑州450052

考虑光伏功率的预测精度强依赖于天气模态和气候条件等因素影响,提出了基于极限学习机组合算法的短期光伏功率预测方法。首先,基于K-means聚类算法进行天气分型,分为4个季节下晴天、多云天气、阴雨天气共12组不同天气类别。其次,针对天... 详细信息

考虑光伏功率的预测精度强依赖于天气模态和气候条件等因素影响,提出了基于极限学习机组合算法的短期光伏功率预测方法。首先,基于K-means聚类算法进行天气分型,分为4个季节下晴天、多云天气、阴雨天气共12组不同天气类别。其次,针对天气分型结果,基于极限学习机ELM、遗传算法改进的极限学习机GA-ELM、鸟群算法改进的极限学习机BSA-ELM3种算法构建光伏功率预测模型。最后,以某光伏电站数据进行所提模型验证。预测结果表明,BSA-ELM预测精度最高,12种天气预测精度达到90%左右,各季节中预测精度最高的天气类型均为晴天,多云天气精度高于阴雨天气精度,可为含高比例光伏并网的新型电力系统安全稳定运行提供有效数据支撑。

关键词：光伏发电功率预测 K-means聚类天气分型极限学习机算法遗传算法鸟群算法

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新时代中国生育政策迭代研究——基于倡议联盟框架的分析

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前沿 2024年第1期 113-126页

作者：刘聪尘兴邦北京航空航天大学公共管理学院北京100191

人口问题是“国之大者”,切实可行的生育政策是解决人口问题的一大重要举措。在厘清新时代中国生育政策的逻辑走向的基础上,尝试运用倡议联盟框架揭示并解释由单独二孩到全面二孩再到全面三孩政策迭代变迁的过程,从而助推生育政策的进... 详细信息

人口问题是“国之大者”,切实可行的生育政策是解决人口问题的一大重要举措。在厘清新时代中国生育政策的逻辑走向的基础上,尝试运用倡议联盟框架揭示并解释由单独二孩到全面二孩再到全面三孩政策迭代变迁的过程,从而助推生育政策的进一步优化升级。研究发现,生育政策迭代变迁是政策子系统、外部事件、相对稳定变量、政策学习、信念体系等多方面共同作用的结果。其中,深层内核信念是促进生育政策稳定迭代变迁的根本原因,政策学习是引发生育政策迭代变迁的重要机制,外部事件为生育政策迭代变迁提供直接动力。此外,印证倡议政策联盟分析中国公共政策问题适切性的同时,也需要对框架体系适当修正,构建本土化的倡议联盟框架,形塑具有中国特色的公共政策话语体系。

关键词：倡议联盟框架生育政策政策迭代

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