检索结果-南通市图书馆

Effect of daily salinity fluctuation on the intraspecific interactions of a euhalophyte(Suaeda salsa)along a salinity gradient

在线全文

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2022年第1期15卷 208-221页

作者： Hua Ma Li-Juan Cui Wei Li Yu Ning yin-Ru Lei Xu Pan Yi-Fei Wang man-yin Zhang Institute of Wetland Research Chinese Academy of ForestryBeijing 100091China Beijing Key Laboratory of Wetland Services and Restoration Institute of Wetland ResearchBeijing 100091China Beijing Hanshiqiao National Wetland Ecosystem Research Station Institute of Wetland ResearchBeijing 101309China Chinese Academy of Forestry Beijing 100091China

Heterogeneity of soil salinity is a prominent environmental characteristic in the intertidal zone of estuaries,affecting the plant growth and the shift of biotic interactions in the salt *** study aims to examine the interactive effects of a salinity gradient and salinity fluctuations on intraspecific interactions of a *** assessed the impact of daily fluctuating salinity on the outcome of intraspecific interactions by cultivating seeds of Suaeda salsa(Chenopodiaceae)in river *** experiment was conducted in a greenhouse with three treatments:daily salinity fluctuations(static and fluctuating salinity),a salinity gradient(200 and 400 mmol L^(−1))and three planting densities(1,2 and 4 plants/pot).First,height and biomass of plants were measured at both the start and end of the ***,the growth indexes and log response ratio of *** were *** outcome of intraspecific interactions of *** shifted from competition in low salinity to facilitation in high salinity,and high conspecific density strengthened the competition and facilitation *** salinity fluctuation did not significantly affect the plant growth and the outcome of intraspecific interactions,but did have a significant influence on belowground *** results suggest that the stress-gradient hypothesis may apply to predicting the variation of the intraspecific relationship of a salt-tolerant species along a salinity gradient,and the magnitude of this variation is density *** findings help us understand how individuals and populations of a euhalophyte species respond to the natural variation or human modification of salinity conditions.

关键词： salinity gradient daily salinity fluctuations euhalophyte intraspecific relationship stress-gradient hypothesis(SGH)

An unsupervised learning approach to study synchroneity of past events in the South China Sea

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2019年第3期13卷 628-640页

作者： Kevin C. Tse Hon-Chim Chiu man-yin Tsang Yiliang Li Edmund Y. Lam Department of Earth Sciences The University of Hong KongPokfulamHong KongChina Department of Geography and Centre for Geo-computation Studies Hong Kong Baptist UniversityKowloon TongHong KongChina Department of Earth Sciences University of TorontoCanada Department of Electrical and Electronic Engineering The University of Hong KongPokfulamHong KongChina

Unsupervised machine learning methods were applied on multivariate geophysical and geochemical datasets of ocean floor sediment cores collected from the South China Sea. The well-preserved and continuous core samples comprising high resolution Cenozoic sediment records enable scientists to carry out paleoenvironment studies in detail. Bayesian age-depth chronological models constructed from biostratigraphic control points for the drilling sites are applied on cluster boundaries generated from two popular unsupervised learning methods: K-means and random forest. The unsupervised learning methods experimented have produced compact and unambiguous clusters from the datasets, indicating that previously unknown data patterns can be revealed when all variables from the datasets are taken into account simultaneously. A study of synchroneity of past events represented by the cluster boundaries across geographically separated ocean drilling sites is achieved through converting the fixed depths of cluster boundaries into chronological ranges represented by Gaussian density plots which are then compared with known past events in the region. A Gaussian density peak at around 7.2 Ma has been identified from results of all three sites and it is suggested to coincide with the initiation of the East Asian monsoon. Contrary to traditional statistical approach, a priori assumptions are not required for unsupervised learning, and the clustering results serve as a novel data-driven proxy for studying the complex and dynamic processes of the paleoenvironment surrounding the ocean sediment. This work serves as a pioneering approach to extract valuable information of regional events and opens up a systematic and objective way to study the vast global ocean sediment datasets.

关键词： machine learning ocean sediments unsupervised classification

Unsupervised learning on scientific ocean drilling datasets from the South China Sea

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2019年第1期13卷 180-190页

作者： Kevin C.TSE Hon-Chim CHIU man-yin TSANG Yiliang LI Edmund Y.LAM Department of Earth Sciences The University of Hong KongPokfulamHong KongChina Department of Geography and Centre for Geo-computation Studies Hong Kong Baptist UniversityKowloon TongHong KongChina Department of Earth Sciences University of TorontoTorontoON M5S 2M8Canada Department of Electrical and Electronic Engineering The University of Hong KongPokfulamHong KongChina

Unsupervised learning methods were applied to explore data patterns in multivariate geophysical datasets collected from ocean floor sediment core samples coming from scientific ocean drilling in the South China *** to studies on similar datasets,but using supervised learning methods which are designed to make predictions based on sample training data,unsupervised learning methods require no a priori information and focus only on the input *** this study,popular unsupervised learning methods including K-means,self-organizing maps,hierarchical clustering and random forest were coupled with different distance metrics to form exploratory data *** resulting data clusters were externally validated with lithologic units and geologic time scales assigned to the datasets by conventional methods. Compact and connected data clusters displayed varying degrees of correspondence with existing classification by lithologic units and geologic time scales.K-means and self-organizing maps were observed to perform better with lithologic units while random forest corresponded best with geologic time *** study sets a pioneering example of how unsupervised machine learning methods can be used as an automatic processing tool for the increasingly high volume of scientific ocean drilling data.

关键词： machine learning unsupervised learning ODP IODP clustering

A fully self-powered, natural-light-enabled fiber-optic vibration sensing solution

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

SusMat 2021年第4期1卷 593-602页

作者： Jiaqi Wang Ho-yin man Cuiling Meng Pengcheng Liu Shaoxin Li Hoi-Sing Kwok Yunlong Zi School of Marine Sciences Sun Yat-Sen UniversityZhuhaiGuangdongP.R.China Department of Mechanical and Automation Engineering The Chinese University of Hong KongShatinN.T.Hong KongP.R.China State Key Laboratory on Advanced Displays and Optoelectronics Technologies The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP.R.China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijingP.R.China

Fiber-optic sensors have been developed to monitor the structural vibration with advantages of high sensitivity,immunity to electromagnetic interference(EMI),flexibility,and capability to achieve multiplexed or distributed ***,the current fiber-optic sensors require precisely polarized coherent lasers as the lighting sources,which are expensive in cost and suffer from the power supply issues while operating at outdoor *** work aims at solving these issues,through developing a fully self-powered,natural-light-enabled *** achieve that,a spring oscillator-based triboelectric nanogenerator(TENG),a polymer network liquid crystal(PNLC),and an optical fiber were *** external vibration drove the PNLC to switch its transparency,allowing the varia-tion of the incident natural light in the optical *** with the majority of conventional TENG-based active vibration sensors,the developed paradigm does not suffer from the EMI,without requirements of the signal preamplifica-tion which consumes additional *** vibration displacement monitoring was performed to validate the sensing effectiveness of the developed paradigm.

关键词： fiber-optics liquid crystal self-powered sensing triboelectric nanogenerators vibration sensing

Drug-coated balloons for treating de novo lesions in large coronary vessels:A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2023年第20期11卷 4920-4925页

作者： Zhi-Qiang Zhang Yi-Ran Qin man yin Xue-Heng Chen Lei Chen Wen-Yan Liang Xi-Qing Wei Jining Key Laboratory for Diagnosis and Treatment of Cardiovascular Diseases Jining Medical UniversityAffiliated Hospital of Jining Medical UniversityJining 272000Shandong ProvinceChina Cheeloo College of Medicine Shandong UniversityJinan 250000Shandong ProvinceChina Jining Medical University Affiliated Hospital of Jining Medical UniversityJining 272000Shandong ProvinceChina

BACKGROUND Percutaneous transluminal coronary angioplasty,while an effective intervention,can frequently lead to acute occlusion with severe *** clinical trials have demonstrated the efficacy of drug-coated balloons(DCB)in treating acute coronary artery occlusion and in preventing restenosis,there has been limited exploration on the use of DCB in treating de novo lesions in large ***,DCB are only recommended for patients with small vessel lesions and in-stent restenosis lesions,those at high risk of bleeding,and other special groups of *** SUMMARY This report presents a case of successful drug-coated balloon treatment of de novo lesions in large coronary ***,the patient demonstrated favorable recovery,with subsequent examination results revealing no significant differences from the previous *** The successful treatment of the patient in our case highlights the potential of DCB in the treatment of de novo lesions in large coronary vessels.

关键词： Drug-coated balloons De novo lesions Large coronary vessels Coronary artery disease Percutaneous coronary intervention Case report

SYSTEMATIC ERROR FROM Th/U RATIO IN LUMINESCENCE AND ESR DATING

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 1995年第2期6卷 113-116页

作者： Li Shenghua and man-yin Wong Tso(Radioisotope Unit,University of Hong Kong,Hong Kong)

In luminescence and ESR dating methods,total count rate from thick source alpha counting is commonly used fox estimating annual dose with assumption of equal activities for both uranium and thorium decay *** is equal to a Th/U weight ratio of *** systematic error in total dose rate due to uncertainty of the ratio is *** is found that the error is insignificant for uniformly distributed samples such as sediment,but can be significant for some extreme circumstances.

关键词： Luminescence and ESR dating Th/U ratio Systematic error Infinite matrix

Impact renaming non-alcoholic fatty liver disease to metabolic associated fatty liver disease in prevalence,characteristics and risk factors

在线全文

学校读者我要写书评

暂无评论

World Journal of Hepatology 2023年第8期15卷 985-1000页

作者： Xin-Juan Huang man yin Bing-Qian Zhou Xin-Yun Tan Yuan-Qin Xia Chun-Xiang Qin Xiangya Nursing of School Central South UniversityChangsha 410013Hunan ProvinceChina School of Medicine Jishou UniversityJishou 416000Hunan ProvinceChina Department of Health Examination Center The Third Xiangya Hospital of Central South UniversityChangsha 410013Hunan ProvinceChina

BACKGROUND Recently,a group of hepatologists proposed to rename non-alcoholic fatty liver disease(NAFLD)as metabolic associated fatty liver disease(MAFLD)with modified diagnostic *** is important to note,however,that there are some differences between the diagnostic criteria used for NAFLD and *** the research on MAFLD is just beginning,however,evidence on its incidence and prevalence in the general population and in specic subpopulations remains *** To assess epidemiology of fatty liver in new definition and compare MAFLD with *** risk factors of MAFLD *** This was a retrospective,cross-sectional study.A total of 85242 adults were selected from the Chinese health management database in 2017–*** data of general information,laboratory indicators,lifestyle management and psychological status were *** was diagnosed as ultrasound diagnosis of fatty liver and at least one between these three conditions:Overweight/obesity,type 2 diabetes mellitus(T2DM)or metabolic *** factors were not considered in NAFLD diagnosis *** clinical characteristics of MAFLD and NAFLD were analysed using descriptive *** variables normally distributed were expressed as means±*** variables were expressed as frequencies and *** logistic regression was used to determine risk factors of the *** The prevalence of MAFLD and NAFLD was 40.5%and 31.0%,*** MAFLD or NAFLD population is more likely to be older(M:47.19±10.82 vs 43.43±11.96;N:47.72±11.17 vs 43.71±11.66),male(M:77.21%vs 44.43%;N:67.90%vs 53.12%)and high body mass index(M:26.79±2.69 vs 22.44±2.48;N:26.29±2.84 vs 23.29±3.12)than the non-MAFLD or non-MAFLD *** multivariate analysis,general information(e.g.,≥2 metabolic abnormalities OR=3.38,(95%CI:2.99-3.81),P<0.001;diastolic blood pressure OR=1.01,(95%CI:1.00–1.01),P=0.002),laboratory results[e.g.,total bilirubin(TBIL)OR=0.9

关键词： Metabolic(dysfunction)-associated fatty liver disease Non-alcoholic fatty liver disease Epidemiology Risk factors Characteristics Cross-section study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

戴维斯非西方艺术意识下的艺术本质反思

学习与探索 2019年第3期 145-150,176页

作者：殷曼楟南京大学哲学系南京210046

"非西方艺术"是艺术定义视域下的一个典型问题。它不仅提出了反思西方中心主义的立场,还向"艺术定义"规划提出了跨文化艺术沟通是否可能的问题。斯蒂芬·戴维斯在"非西方艺术"问题意识下深化了对艺术定义的思考,提出了一种历史必要性限... 详细信息

"非西方艺术"是艺术定义视域下的一个典型问题。它不仅提出了反思西方中心主义的立场,还向"艺术定义"规划提出了跨文化艺术沟通是否可能的问题。斯蒂芬·戴维斯在"非西方艺术"问题意识下深化了对艺术定义的思考,提出了一种历史必要性限定下的艺术本质观。即艺术的本质属性因文化变迁而发生变化,某种普遍性基础在其中则持续地提供了一定的稳定性与可识别性,这些都共同构成了艺术本质的某个部分。该视野为我们思考中国艺术的本土化与全球化问题提供了更多层次的框架。

关键词：艺术定义非西方艺术斯蒂芬·戴维斯艺术体制理论

Young adults’perceptions of breastfeeding in public:a focus group study

在线全文

学校读者我要写书评

暂无评论

Frontiers of Nursing 2020年第3期7卷 217-226页

作者： Ka-Huen Yip Yuk-Chiu Yip Catherine man-yin Lee Mei-Yi Siu Shu-ying Ngai Mei-Kuen Chow School of Health Sciences Caritas Institute of Higher EducationHong KongChina School of Nursing The University of Hong KongHong KongChina

Objective:To elucidate the perceptions of young Chinese adults aged 18–25 toward adopting breastfeeding in public in Hong Kong Special Administrative Region(Hong Kong),***:A descriptive and exploratory study design was *** were recruited by convenience *** group data were collected from three semi-structured *** from 18 participants were audiotaped,transcribed verbatim,coded,and analyzed using content ***:Four themes emerged that described the young adults’perceptions and barriers toward breastfeeding practices:(1)adaptability of self and others,(2)cultural deem and practice,(3)convenience and connection,and(4)education and ***,all respondents(male and female)are aware of the benefits of *** negative perceptions toward breastfeeding initiation and continuation originate from factors that are essentially extraneous to the mother-infant dyads(such as the breadth and intensity of sociopolitical support,the dominant social beliefs and norms,and the inadequacy of breastfeeding education in adolescent years).Conclusions:In general,the young adult’s perception of breastfeeding is dominated by sociopolitical and cultural-related *** particular,sexualization of breasts as a deep-rooted belief in the Chinese context negatively affects young adults’perceptions and limits their breastfeeding practices.

关键词： breastfeeding young adult perceptions Chinese Hong Kong