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An AI-empowered indoor digital contact tracing system for COVID-19 outbreaks in residential care homes

Infectious Disease Modelling 2024年第2期9卷 474-482页

作者： Jiahui Meng Justina Yat Wa Liu Lin Yang Man Sing Wong Hilda Tsang Boyu yu jincheng yu Freddy Man-Hin Lam Daihai He Lei Yang Yan Li Gilman Kit-Hang Siu Stefanos Tyrovolas Yao Jie Xie David Man David H.K.Shum School of Nursing The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina Electronic and Information Engineering The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina Research Centre of Textiles for Future Fashion The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina Department of Land Surveying and Geo-Informatics The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina Department of Applied Mathematics The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina The Jockey Club School of Public Health and Primary Care The Chinese University of Hong KongHong Kong Special Administrative RegionChina Department of Rehabilitation Sciences The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina Department of Computing The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina Department of Health Technology and Informatics The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina Department of Nutrition and Food Studies George Mason UniversityUSA Tung Wah College Hong Kong Special Administrative RegionChina Mental Health Research Centre The Hong Kong Polytechnic UniversityHong Kong Special Administrative RegionChina

An AI-empowered indoor digital contact-tracing system was developed using a centralized architecture and advanced low-energy Bluetooth technologies for indoor positioning,with careful preservation of privacy and data *** analyzed the contact pattern data from two RCHs and investigated a COVID-19 outbreak in one study *** evaluate the effectiveness of the system in containing outbreaks with minimal contacts under quarantine,a simulation study was conducted to compare the impact of different quarantine strategies on outbreak containment within *** significant difference in contact hours between weekdays and weekends was observed for some pairs of RCH residents and staff during the two-week data collection *** significant difference between secondary cases and uninfected contacts was observed in a COVID-19 outbreak in terms of their demographics and contact *** results based on the collected contact data indicated that a threshold of accumulative contact hours one or two days prior to diagnosis of the index case could dramatically increase the efficiency of outbreak containment within RCHs by targeted isolation of the close *** study demonstrated the feasibility and efficiency of employing an AI-empowered system in indoor digital contact tracing of outbreaks in RCHs in the post-pandemic era.

关键词： COVID-19 Indoor contact tracing Contact pattern Outbreak containment Artificial intelligence

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社会主义市场经济是市场经济创新形态

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学习论坛 2024年第3期 16-23页

作者：余金成娄银梅天津师范大学社会主义研究所天津300387 天津职业大学马克思主义学院天津300410

资本主义市场经济的“自由竞争、优胜劣汰”虽然建构了有效的劳动动员方式,但没有消除社会长期贫富分化的局面;社会主义市场经济顺应经济全球化趋势,确立了在资源配置上市场作用和政府作用紧密结合的机制。这一创新构成社会主义市场经... 详细信息

资本主义市场经济的“自由竞争、优胜劣汰”虽然建构了有效的劳动动员方式,但没有消除社会长期贫富分化的局面;社会主义市场经济顺应经济全球化趋势,确立了在资源配置上市场作用和政府作用紧密结合的机制。这一创新构成社会主义市场经济的实践样态:在运行理念上,推动“竞争—平等”原则转变为“自由—平等”原则,使全体人民共同富裕成为可实现的目标;在运行机制上,将“政府一般作用”提升至“政府更好作用”,促进物质文明和精神文明协调发展,以人的全面发展支撑全体人民共同富裕;在运行原则上,使人与自然和谐共生,打造人类命运共同体。

关键词：社会主义市场经济中国式现代化理念机制原则

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马克思“自由个性”理想与社会主义市场经济实践

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马克思主义理论教学与研究 2024年第1期 55-64页

作者：余金成天津师范大学社会主义研究所

马克思从人的生产能力角度阐释的历史三阶段理论,是唯物史观的重要组成部分。其中,关于“自由个性”的理想社会涉及两个基础条件:一是“个人全面发展”,二是“人们共同的、社会的生产能力成为从属于他们的社会财富”。社会主义市场经济... 详细信息

马克思从人的生产能力角度阐释的历史三阶段理论,是唯物史观的重要组成部分。其中,关于“自由个性”的理想社会涉及两个基础条件:一是“个人全面发展”,二是“人们共同的、社会的生产能力成为从属于他们的社会财富”。社会主义市场经济中的市场作用针对前者,政府作用则彰显后者,双方从实践层面补充了实现未来理想社会的逻辑环节,确证了“自由个性”的社会必然到来。

关键词：马克思自由个性社会主义市场经济

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沈阳市臭氧污染特征及其影响因素

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生态环境学报 2024年第1期33卷 72-79页

作者：蒋伯琪浮天程昳璇苏枞枞沈建东于谨铖于兴娜南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室江苏南京210044 辽宁省沈阳生态环境监测中心辽宁沈阳110000 浙江省杭州生态环境监测中心浙江杭州310012

近年来中国城市O_(3)污染问题日益突出,近地面O_(3)已成为沈阳市的主要空气污染物之一。基于沈阳市2019年近地面臭氧(O_(3))及其前体物(VOCs和NO_(2))的逐时数据,结合同期气象观测资料,研究了2019年沈阳大气O_(3)的季节变化特征,分析了V... 详细信息

近年来中国城市O_(3)污染问题日益突出,近地面O_(3)已成为沈阳市的主要空气污染物之一。基于沈阳市2019年近地面臭氧(O_(3))及其前体物(VOCs和NO_(2))的逐时数据,结合同期气象观测资料,研究了2019年沈阳大气O_(3)的季节变化特征,分析了VOCs和NO_(2)以及气象条件对O_(3)生成的影响;利用最大增量反应活性法(MIR)估算了沈阳大气VOCs的臭氧生成潜势(OFP),并运用正交矩阵因子分解法(PMF)进行了沈阳夏季VOCs的来源解析。结果表明:2019年沈阳市O_(3)平均质量浓度夏季最高,其次是春季和秋季,冬季最低;四季O_(3)日变化特征均表现为单峰型,质量浓度峰值出现在14:00左右,谷值出现在07:00左右。沈阳市O_(3)质量浓度与温度、风速均呈现正相关关系(P=0.001,P=0.005),与相对湿度呈负相关关系(P=0.005);当温度达到30.0℃以上,O_(3)质量浓度明显升高;风速低于3.0 m·s^(-1)时O_(3)质量浓度小于75.0μg·m^(-3),而风速超过4.0 m·s^(-1)时O_(3)质量浓度迅速升高至100μg·m^(-3);湿度小于20%时O_(3)质量浓度较高,当湿度大于80%时O_(3)质量浓度显著降低,由75.0μg·m^(-3)降低至58.7μg·m^(-3)。O_(3)平均质量浓度与前体物VOCs和NO_(2)质量浓度呈负相关关系(P=0.005),O_(3)平均质量浓度最大值对应的NO_(2)质量浓度区间为20.0-30.0μg·m^(-3)。2019年沈阳市大气VOCs的臭氧生成潜势依次表现为烯烃>芳香烃>烷烃>炔烃,烯烃在4个季节均为最大贡献者,表明烯烃对沈阳市O_(3)生成具有重要贡献。夏季沈阳市VOCs主要来源于石油化工源、溶剂使用源、液化石油气污染源、燃烧源和机动车排放源。沈阳作为我国传统重工业基地,加强对石油化工、溶剂使用和燃料挥发等方面的监管是降低沈阳市大气O_(3)质量浓度水平的有效途径。该研究可以为沈阳市O_(3)污染治理提供重要参考。

关键词：沈阳臭氧 VOCs 污染特征气象条件臭氧生成潜势来源解析

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Microwear analysis of a bone-handled microblade excavated at Shangzhai site in Beijing: Evidences from ESEM

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Science China Earth Sciences 2010年第9期53卷 1335-1342页

作者： CUI TianXing YANG Qin yu jincheng ZHOU ShuangLin ZHAO ChaoHong School of Archaeology and Museology Peking UniversityBeijing 100871China Beijing Institute of Cultural Relics Beijing 100009China

The conventional wisdom has been challenged recently that microblades with handles are only tools for hunting and gathering in the Neolithic Age. Some scholars argued that microblades actually played an important part in the early agricultural development in the Neolithic. However, both of these opinions lacked direct evidence. Environmental scanning electron microscopy (ESEM) is used to analyze the residues of the bone-handled microblade excavated at the Shangzhai site in Pinggu, Beijing. The ESEM observation and EDX analysis show that at the edge of this bone-handled microblade are Ca, P, C, O or C, N, O, etc, which provide direct evidence for determining its function, namely that this microblade may have been dealt with animals. In addition, there was a layer of glue at the back of the microblade with barium and zinc salt distributed evenly in it, this new discovery sheds new light on adhesive technology in ancient China.

关键词： Shangzhai culture bone-handled microblade microwear analysis ESEM EDX

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Pottery lipid analysis at the Shangzhai site,Beijing,and its implication for subsistence strategy

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Science China Earth Sciences 2023年第8期66卷 1789-1797页

作者： Nanning Lyu Tao WANG jincheng yu Huiyun RAO Bin HAN Yimin YANG Key Laboratory of Vertebrate Evolution and Human Origins Institute of Vertebrate Paleontology and PaleoanthropologyChinese Academy of SciencesBeijing 100044China Department of Archaeology and Anthropology University of Chinese Academy of SciencesBeijing 100049China School of History Capital Normal UniversityBeijing 100048China Beijing Institute of Archaeology Beijing 100009China

As the crossroads of prehistoric cultures,the Beijing region is an important area for studying the exchange of prehistoric culture and the spread of millet *** millet remains have been found in the Donghulin site during the Early Neolithic Age,there is little millet remains during the Middle and Late Neolithic Age,so there is a gap of approximately2,000 years since the time of the Donghulin *** Shangzhai site is located in the Pinggu Basin in eastern Beijing,and it has a large time span with sequential strata;however,there are few large animals and plant remains found at this site,thus the subsistence strategy of ancient people remains *** this study,the absorbed lipids of pottery sherds unearthed in the Neolithic cultural layer of the Shangzhai site were extracted and *** results show that these potteries were used to process millet,the meat of terrestrial non-ruminants and wild ruminants,and dairy of wild ruminants,providing new insights for the subsistence strategy and the development of millet agriculture in the Middle and Late Neolithic Age of *** addition,the food processing in pottery may be an internal heating method,such as stone boiling.

关键词： Shangzhai site Millet agriculture Subsistence strategy Pottery lipid analysis Stone boiling

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Starch grain analysis reveals function of grinding stone tools at Shangzhai site, Beijing

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Science China Earth Sciences 2009年第8期52卷 1164-1171页

作者： YANG XiaoYan yu jincheng Lü Houyuan CUI TianXing GUO JingNing GE QuanSheng Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China Beijing Cultural Relics Institute Beijing 100009China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China School of Archaeology and Museology Peking UniversityBeijing 100871China

Prehistoric groundstone tools including slabs (metate, mo-pan) and mullers (mano, mo-bang) are often considered to be tools that were used to process cereals in ancient China. Most archaeologists believe that groundstone tools are indicators of an agrarian economy. This study employed starch grain analysis to examine a slab and a muller excavated from the Shangzhai Site (7500-7000 cal a BP), Beijing. Identifiable starch grains recovered from the stone tools were classified into 9 genera and 12 species, most of which were from acorns and foxtail millets. Remains from the oak species Q. mongolicus, Q. acuttssima, and Q. dentate were identified as well as a few starch grains from broomcorn (Panicum miliaseum) and bean (Vigna sp.). Other starch grains were from unidentifiable roots and grasses. A variety of starch grains indicates that the grinding stone tools were used to process not only cereals, but also other seeds or roots that had to be ground or husked, thus bringing into question the aforementioned cereal hypothesis. Because the numbers of starch grains from nuts and millets were so large, both gathering and cultivation might have been important economic patterns before 7000 years ago in Beijing area. Moreover, the starch remains are derived from plants that indicate that the paleoclimate of Beijing was wetter and warmer than today’s.

关键词： starch grain analysis artifact function slab and muller Shangzhai Site Beijing

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Dynamic tensile properties and microstructural evolution of extruded EW75 magnesium alloy at high strain rates

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Journal of Magnesium and Alloys 2020年第3期8卷 849-859页

作者： jincheng yu Bo Song Dabiao Xia Xun Zeng yuanding Huang Norbert Hort Pingli Mao Zheng Liu School of Mechanical Technique Wuxi Institute of TechnologyWuxi 214121China School of Materials and Energy Southwest UniversityChongqing 404100China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China MagIC-Magnesium Innovation Centre Helmholtz-Zentrum GeesthachtGeesthacht 21502Germany School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

The dynamic tensile properties and microstructural evolution of an extruded EW75 magnesium alloy deformed at ambient temperature and different high strain rates(from 1000 to 3000 s^(-1))along extrusion direction(ED)were investigated by Split Hopkinson Tension Bar(SHTB).The corresponding deformation mechanisms,texture evolution and microstructure changes were analyzed by optical microscope(OM),electron backscatter diffraction(EBSD)and transmission electron microscope(TEM).The results show that the extruded EW75 magnesium alloy along ED exhibits a conventional positive strain rate sensitivity that the dynamic flow stresses increase with in creasing strain *** measurements show that after dynamic tension,the initial weak texture of extruded EW75 magnesium alloy tansforms to a relatively strong//ED texture with increasing strain *** microstructural analysis demonstrates that dislocation motion are main deformatin mode to accommodate dynamic tensile deformation at high strain *** addition,the interactions of dislocation-dislocation and dislocation-second phase lead to the in crease of flow stress and strain hardening with increasing strain rate.

关键词： EW75 magnesium alloy High strain rates Split Hopkinson test Texture Microstructure

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Starch grain evidence reveals early pottery function cooking plant foods in North China

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Chinese Science Bulletin 2014年第32期59卷 4352-4358页

作者： Xiaoyan Yang Zhikun Ma Tao Wang Linda Perry Quan Li Xiujia Huan jincheng yu Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences University of Chinese Academy of Sciences School of Geography Beijing Normal University Department of Archaeology and Museology Capital Normal University The Foundation for Archaeobotanical Research in Microfossils Fairfax VA 22038 USA Department of Geography and Geoinformation Science Center for Earth Observing and Space Research George Mason University Fairfax VA 22030 USA Beijing Institute of Cultural Relics

Early pottery sherds excavated in northern China date back to more than 11,000 cal a BP,and are presumed to have been used as cooking *** has been,however,no direct evidence to demonstrate this *** we report ancient starch grains recovered from carbonized residues adhering to the bases of flatbottomed vessels excavated from the Zhuannian site dating more than 10,000 cal a BP in the North China *** evidence demonstrates that early pottery was being used to cook cereal grains,particularly millets,and *** millets were in the process of domestication at thistime,we propose that pottery invention in northern China may have been related to early farming activities.

关键词：中国北方烹饪器皿淀粉粒植物性食物陶器早期证据 CAL

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Origins,timing and introgression of domestic geese revealed by whole genome data

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Journal of Animal Science and Biotechnology 2023年第3期14卷 936-949页

作者： Junhui Wen Haiying Li Huie Wang jincheng yu Tao Zhu Jinxin Zhang Xinghua Li Zhihua Jiang Zhonghua Ning Lujiang Qu Department of Animal Genetics and Breeding National Engineering Laboratory for Animal BreedingCollege of Animal Science and TechnologyChina Agricultural UniversityBeijingChina College of Animal Science Xinjiang Agricultural UniversityUrumqiChina Xinjiang Production&Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin AlarXinjiangChina College of Animal Science Tarim UniversityAlarXinjiangChina Liaoning Academy of Agricultural Sciences ShenyangChina Department of Animal Sciences Washington State UniversityPulmanUSA

Background Geese are among the most important poultry species in the *** current generally accepted hypothesis is that the European domestic geese originated from greylag geese(Anser anser),and Chinese domestic geese have two origins,most of which originated from swan geese(Anser cygnoides),and the Yili goose originated from greylag *** explain the origin and demographic history of geese,we selected 14 goose breeds from Europe and China and wild populations of swan and greylag geese,and whole genome sequencing data were obtained for 74 *** Population structure analysis and phylogenetic trees showed that the wild ancestor of Chinese domestic geese,except for Yili,is the swan geese,and the wild ancestor of Chinese Yili and European domestic geese is greylag *** of the demographic history suggests that the domestication of Chinese geese occurred~3499 years ago and that of the European geese occurred~7552 years ***,gene flow was observed between domestic geese and their wild *** of introgression showed that Yili geese had been introgressed by Chinese domestic geese,and the body size of Yili geese may be influenced by introgression events of some growthrelated genes,including *** Our study provides evidence for the origin of geese at the genome-wide level and advances the understanding of the history of goose domestication and the traits affected by introgression events.

关键词： Domestication Goose Introgression Phylogeny

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