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Research on indoor multi-degree-of-freedom ski training system

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Research on indoor multi-degree-of-freedom ski training syst...

Urban Housing Price Bubble and Financial Stability:An Empirical Study Based on the PVAR Model of 35 Large and Medium-Sized Cities in China

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作者： boyang li Qing Fei Hongqing Cao School of Automation Beijing Institute of Technology

In this paper, a multi-freedom ski training system is introduced for indoor alpine skiing training and *** translation platform and the six-degree-of-freedom platform are adopted in the system to realize a wide range of slalom training and terrain simulation. Combining the washout algorithm with the virtual scene and terrain information in Unity3 D, the system provides users with the real physical and visual experience of alpine skiing. In the design of washout algorithm, sparrow search algorithm（SSA） is used to optimize the parameters of washout filter, which can achieve a less sensation error and a higher efficiency of the workspace usage. Simulation and experimental results show that our system can give users a real alpine skiing experience, and facilitate the users to ski training and experience the terrain of the ski trail.

关键词： Alpine Skiing 6-DOF Platform Washout Algorithm Sparrow Search Algorithm Unity3D

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Urban Housing Price Bubble and Financial Stability:An Empiri...

Modular Synthesis of Tetraurea and Octaurea Macrocycles Encoded with Specific Monomer Sequences

作者： SHEN Yue li boyang ZHANG Jiawang Xi’an Jiaotong University

The ever-expanding housing price bubble has become the largest"grey rhino"hidden in Chinese *** on the expected equilibrium price model of real estate,this paper makes a scientific measurement of China ’s urban housing price *** the basis of theoretical analysis,it takes the panel data of 35 large and medium-sized cities during the period of 2000-2017 as the samples to conduct an empirical analysis of the dynamic relationship between China ’s urban housing price bubble and financial stability with the PVAR *** findings show that the impact of housing price bubble on financial stability can support the price deviation hypothesis,in the eastern cities and the cities with stronger financial support,the housing price bubble has a greater destructive effect;moreover,compared with bubble expansion,the shrinkage of housing price bubble has a stronger impact on financial *** this regard,the real estate regulation and control should adhere to the differentiated regulation measures according to the real conditions of the cities,squeeze out the bubbles in a fine adjustment way,guard against the risk of " two way imbalance"in the implementation of regulation policies,speed up the establishment of a long-acting housing system with multi-subject supply,multi-channel protection,and the double way of rent and purchase.

关键词： housing price bubble financial stability PVAR model

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CCS Chemistry 2022年第7期4卷 2498-2507页

作者： Guowei Zhao Si-Qi Chen Wei Zhao boyang li Wenyao Zhang Bo Zheng Xiao-Juan Yang Biao Wu Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education College of Chemistry and Materials ScienceNorthwest UniversityXi’an 710069 Key Laboratory of Cluster Science of Ministry of Education Key Laboratory of Medical Molecule Science and Pharmaceutics EngineeringMinistry of Industry and Information TechnologySchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 102488

Intermolecular hydrogen bonding among urea units grants prominent mechanical strength to polyurea elastomer ***,such interactions can cause significant solubility problems when synthesizing oligourea macrocycles with a large number of urea units,and it remains unknown for macrocycles containing more than six urea ***,we demonstrate a two-step,modular strategy for making a new class of tetraurea and octaurea macrocycles using commercially available building *** hydrogen bonding within the fundamental o-phenylene bis(urea)unit is the key to overcoming intermolecular hydrogen bonding to form favorable conformations for ring-closure *** size and monomer sequences can be controlled by varying the flexibility of the *** diphenyl methylene and diphenyl ether linkers selectively afford tetraurea macrocycles,whereas the flexible hexylene linker produces octaurea *** encoded with two different spacers were also *** these macrocycles are confirmed by X-ray diffraction structural analysis of the complexed forms with sulfate ***,a unique“figure-eight”structure is observed for the complex of MUH octaurea macrocycle with two encapsulated sulfate *** study shows a paradigm of making large oligourea macrocycles with designer properties in a programable manner with tunable monomer sequences.

关键词： macrocycle modular synthesis oligo(urea) sulfate binding sequence-control

A review of artificial intelligence applications in high-speed railway systems

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High-Speed Railway 2024年第1期2卷 11-16页

作者： Xuehan li Minghao Zhu boyang Zhang Xiaoxuan Wang Zha liu liang Han School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China School of Economics and Management Beijing Jiaotong UniversityBeijing 100044China Business School of Hunan University Changsha 410082China

In recent years,the global surge of High-speed Railway(HSR)revolutionized ground transportation,providing secure,comfortable,and punctual *** next-gen HSR,fueled by emerging services like video surveillance,emergency communication,and real-time scheduling,demands advanced capabilities in real-time perception,automated driving,and digitized services,which accelerate the integration and application of Artificial Intelligence(AI)in the HSR *** paper first provides a brief overview of AI,covering its origin,evolution,and breakthrough applications.A comprehensive review is then given regarding the most advanced AI technologies and applications in three macro application domains of the HSR system:mechanical manufacturing and electrical control,communication and signal control,and transportation *** literature is categorized and compared across nine application directions labeled as intelligent manufacturing of trains and key components,forecast of railroad maintenance,optimization of energy consumption in railroads and trains,communication security,communication dependability,channel modeling and estimation,passenger scheduling,traffic flow forecasting,high-speed railway smart ***,challenges associated with the application of AI are discussed,offering insights for future research directions.

关键词： High-speed railway Artificial intelligence Intelligent distribution Intelligent control Intelligent scheduling

基于“心脉-玄府-肾络”探讨Ⅱ型心肾综合征的中医辨治

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北京中医药 2024年第9期43卷 1049-1053页

作者：刘家佑赵云王曼睿李博洋吴怡平张博雅秦建国北京中医药大学第二临床医学院北京100078 北京中医药大学东方医院肾病科北京100078

Ⅱ型心肾综合征发生于慢性心肾疾病的终末阶段,是临床防治难点。从“心脉-玄府-肾络”探讨该病病机,结合疾病动态变化特点,气血不足、心脉虚滞是始动因素;玄府失和、开阖不利是中心枢纽;痰瘀搏结、肾络受损是病机关键。据此确立以畅荣心... 详细信息

Ⅱ型心肾综合征发生于慢性心肾疾病的终末阶段,是临床防治难点。从“心脉-玄府-肾络”探讨该病病机,结合疾病动态变化特点,气血不足、心脉虚滞是始动因素;玄府失和、开阖不利是中心枢纽;痰瘀搏结、肾络受损是病机关键。据此确立以畅荣心脉,燮和玄府,通达肾络为主的治法,临证灵活配伍补益、理气之品荣心脉,辛、甘诸药调玄府,活血、祛痰饮及虫藤类药通肾络。

关键词： Ⅱ型心肾综合征心脉玄府肾络

Neogene integrative stratigraphy,biotas,and paleogeographical evolution of the Qinghai-Tibetan Plateau and its surrounding areas

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Science China Earth Sciences 2024年第4期67卷 1326-1359页

作者： Tao DENG Xiaomin FANG Qiang li Shiqi WANG Feixiang WU Sukuan HOU Jiao MA Qigao JIANGZUO Danhui SUN Yan ZHENG Qinqin SHI boyang SUN Lu li Key Laboratory of Vertebrate Evolution and Human Origins Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China CAS Center for Excellence in life and Paleoenvironment Beijing 100044China University of Chinese Academy of Sciences Beijing 100049China CAS Center for Excellence in Tibetan Plateau Earth Sciences and Key Laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencesPeking UniversityBeijing 100871China

The remarkable uplift of the Tibetan Plateau in the Neogene had great impacts on the climate and environment of East Asia and even the ***,establishment of the Neogene stratigraphic framework of the Tibetan Plateau is of great significance to research in various fields of *** on marine sediments,the international chronostratigraphic system of the Neogene is divided into six stages in the Miocene and two stages in the *** the beginning of the Cenozoic,the share of terrestrial strata on continents has increased *** the Neogene,it had far exceeded that of marine strata,and almost all deposits on the Tibetan Plateau and its surrounding areas were terrestrial *** China,the Miocene includes five stages and the Pliocene includes two *** for the Tunggurian of the Miocene,which has a lower boundary at 15 Ma,the other stages have the same paleomagnetic definitions and time intervals as the corresponding international marine *** fossils play a very important role in the division and correlation of Cenozoic terrestrial strata,and rodent,carnivore,proboscidean,perissodactyl and artiodactyl fossils are especially important in Neogene terrestrial *** are many basins with well-exposed strata and abundant mammalian fossils in the Tibetan *** lower boundary stratotype sections of the Neogene Xiejian and Bahean stages are located respectively in the Xining and linxia basins,and there are precise paleomagnetic dates in coordination with mammalian *** lower boundary stratotypes of other stages can also be effectively determined in the Tibetan *** first appearing mammalian genera in East Asia also appeared in the Tibetan Plateau and its surrounding areas,especially in the linxia Basin on the northeast margin and in the Siwaliks on the southwest *** them,Prodeinotherium first appeared at the bottom of the Miocene in the Siwaliks,and the earliest Hipparion of the Old

关键词： Tibetan Plateau Neogene Terrestrial stratum Mammalian fossil Paleomagnetism

Isolation and microbial transformation of tea sapogenin from seed pomace of Camellia oleifera with anti-inflammatory effects

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Chinese Journal of Natural Medicines 2024年第3期22卷 280-288页

作者： SHEN Pingping JIANG Xuewa ZHANG Jingling WANG Jiayi Raj Richa li Guolong GE Haixia WANG Weiwei YU boyang ZHANG Jian State Key Laboratory of Natural Medicines China Pharmaceutical UniversityNanjing 210009China Co-construction Collaborative Innovation Center for Chinese Medicine Resources Industrialization by Shaanxi&Education Ministry Shaanxi Province Key Laboratory of New Drugs and Chinese Medicine Foundation ResearchShaanxi University of Chinese MedicineXianyang 712046China School of life Sciences Huzhou UniversityHuzhou 313000China Nanjing Hospital of Chinese Medicine Affiliated to Nanjing University of Chinese Medicine Nanjing 210046China Jiangsu Key Laboratory of TCM Evaluation and Translational Research China Pharmaceutical UniversityNanjing 211198China

In the current study,tea saponin,identified as the primary bioactive constituent in seed pomace of Camellia oleifera Abel.,was meticulously extracted and hydrolyzed to yield five known sapogenins:16-O-tiglogycamelliagnin B(a),camelliagnin A(b),16-O-angeloybarringtogenol C(c),theasapogenol E(d),theasapogenol F(e).Subsequent biotransformation of compound a facilitated the isolation of six novel metabolites(a1−a6).The anti-inflammatory potential of these compounds was assessed using pathogenassociated molecular patterns(PAMPs)and damage-associated molecular patterns molecules(DAMPs)-mediated cellular inflammation ***,compounds b and a2 demonstrated significant inhibitory effects on both lipopolysaccharide(LPS)and high-mobility group box 1(HMGB1)-induced inflammation,surpassing the efficacy of the standard anti-inflammatory agent,***,compounds d,a3,and a6 selectivity targeted endogenous HMGB1-induced inflammation,showcasing a pronounced *** results underscore the therapeutic promise of *** seed pomace-derived compounds as potent agents for the management of inflammatory diseases triggered by infections and tissue damage.

关键词： Camellia oleifera Seed pomace Tea sapogenin Microbial transformation Damage-associated molecular patterns and Pathogen-associated molecular patterns Anti-inflammatory activity

A Novel Simulation Method for Power Electronics: Discrete State Event Driven Method

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CES Transactions on Electrical Machines and Systems 2017年第3期1卷 273-282页

作者： boyang li Zhengming Zhao Yi Yang Yicheng Zhu Zhujun Yu Department of Electrical Engineering Tsinghua UniversityBeijing100084China Department of Electrical Engineering Tsinghua UniversityBeijingChina 不详

In the analysis of power electronics system,it is necessary to simulate ordinary differential equations(ODEs)with discontinuities and ***,there are many difficulties in using traditional discrete-time algorithms to solve such *** and others presented the quantized state systems(QSS)algorithm in the discrete event system specification(DEVS)*** discretization is applied to the state variables instead of time range in *** is efficient to solve ODEs,but it is difficulty to be used when simulating actual power electronics systems with controller’s and other *** on the idea of this numerical algorithm and discrete event,a Discrete State Event Driven(DSED)simulation method is presented in this paper,which is fit for simulation of power electronics *** method is developed to deal with non-linearity,stiffness and multi-time scale of power electronics *** DSED simulation method includes event definition,module seperation and modeling,event-driven mechanisms,numerical computation based on QSS,and some other *** results verified the effectiveness and validity of the proposed method.

关键词： Discrete state event driven simulation method discontinuities and stiffness power electronics systems

溶剂辅助蒸馏萃取铁观音乌龙茶香气的组成分析

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香料香精化妆品 2024年第5期 150-156页

作者：阳丽红郭宁李博洋周子萱陈佳洪鹏张鑫徐春明赵华杰恒枫食品科技有限公司浙江杭州311215

采用溶剂辅助蒸馏萃取(SAFE)技术结合气相色谱-质谱联用法研究铁观音乌龙茶茶叶和茶汤香气特性。共检测出57种挥发性成分,茶汤中有54种,茶叶中有52种,二者在关键挥发性成分和含量上存在差异。通过调节SAFE的水浴温度和冷凝器温度(30~40... 详细信息

采用溶剂辅助蒸馏萃取(SAFE)技术结合气相色谱-质谱联用法研究铁观音乌龙茶茶叶和茶汤香气特性。共检测出57种挥发性成分,茶汤中有54种,茶叶中有52种,二者在关键挥发性成分和含量上存在差异。通过调节SAFE的水浴温度和冷凝器温度(30~40℃),优化茶汤的挥发性成分提取工艺,发现水浴和冷凝器温度均为35℃时,铁观音茶汤香气提取效果较好。在此温度下,结合使用溶剂萃取(SE)获得的关键风味物质含量比结合固相萃取(SPE)高,但关键风味物质占总挥发性成分比例上无统计学差异(P>0.05)。

关键词：铁观音乌龙茶香气成分溶剂辅助蒸馏萃取溶剂萃取固相萃取