检索结果-南通市图书馆

Early detection and classification of live bacteria using time-lapse coherent imaging and deep learning

Light(Science & Applications) 2020年第1期9卷 890-906页

作者： Hongda Wang Hatice Ceylan Koydemir Yunzhe Qiu Bijie Bai Yibo Zhang Yiyin Jin Sabiha Tok Enis Cagatay Yilmaz Esin Gumustekin Yair Rivenson Aydogan Ozcan Electrical and Computer Engineering Department University of CaliforniaLos AngelesCA 90095USA Bioengineering Department University of CaliforniaLos AngelesCA 90095USA California NanoSystems Institute University of CaliforniaLos AngelesCA 90095USA Department of Biophysics Istanbul Medical FacultyIstanbul UniversityIstanbul 22000Turkey Department of Microbiology Immunologyand Molecular GeneticsUniversity of CaliforniaLos AngelesCA 90095USA Department of Surgery David Geffen School of MedicineUniversity of CaliforniaLos AngelesCA 90095USA

Early identification of pathogenic bacteria in food,water,and bodily fluids is very important and yet challenging,owing to sample complexities and large sample volumes that need to be rapidly screened.Existing screening methods based on plate counting or molecular analysis present various tradeoffs with regard to the detection time,accuracy/sensitivity,cost,and sample preparation complexity.Here,we present a computational live bacteria detection system that periodically captures coherent microscopy images of bacterial growth inside a 60-mm-diameter agar plate and analyses these time-lapsed holograms using deep neural networks for the rapid detection of bacterial growth and the classification of the corresponding species.The performance of our system was demonstrated by the rapid detection of Escherichia coli and total coliform bacteria(i.e.,Klebsiella aerogenes and Klebsiella pneumoniae subsp.pneumoniae)in water samples,shortening the detection time by >12 h compared to the Environmental Protection Agency(EPA)-approved methods.Using the preincubation of samples in growth media,our system achieved a limit of detection(LOD)of ~1 colony forming unit(CFU)/L in≤9 h of total test time.This platform is highly cost-effective(~$0.6/test)and has high-throughput with a scanning speed of 24 cm2/min over the entire plate surface,making it highly suitable for integration with the existing methods currently used for bacteria detection on agar plates.Powered by deep learning,this automated and cost-effective live bacteria detection platform can be transformative for a wide range of applications in microbiology by significantly reducing the detection time and automating the identification of colonies without labelling or the need for an expert.

关键词： coherent Early lapse

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Surface warming patterns dominate the uncertainty in global water vapor plus lapse rate feedback

引用

Acta Oceanologica Sinica 2020年第3期39卷 81-89页

作者： Jingchun Zhang Jian Ma Jing Che Zhenqiang Zhou Guoping Gao College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China College of Marine Science and Engineering Shanghai Maritime UniversityShanghai 201306China

Climate feedbacks have been usually estimated using changes in radiative effects associated with increased global-mean surface temperature. Feedback uncertainties, however, are not only functions of global-mean surface temperature increase. In projections by global climate models, it has been demonstrated that the geographical variation of sea surface temperature change brings significant uncertainties into atmospheric circulation and precipitation responses at regional scales. Here we show that the spatial pattern of surface warming is a major contributor to uncertainty in the combined water vapour-lapse rate feedback. This is demonstrated by computing the global-mean radiative effects of changes in air temperature and relative humidity simulated by 31 climate models using a methodology based on radiative kernels. Our results highlight the important contribution of regional climate change to the uncertainty in climate feedbacks, and identify the regions of the world where constraining surface warming patterns would be most effective for higher skill of climate projections.

关键词： surface warming patterns uncertainty water vapor feedback lapse rate feedback relative humidity air temperature radiative kernels

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

STUDIES ON GEOGRAPHIC DISTRIBUTION OF THE ALTITUDINAL lapse RATE OF TEMPERATURE IN CHINA

引用

Chinese Science Bulletin 1992年第23期37卷 1979-1983页

作者：方精云 Research Center for Eco-Enviranmental Science Academia Sinica Beijing 100085 PRC

Based on the statistical analysis, the author studied the geographic distribution of altitudinal lapse rate of temperature (ALRT) in China from points of the difference of the ALRT between the south and north, annual change of the ALRT and effect of macrotopography on the ALRT, using temperature data from 671 national standard meteorological stations.

关键词： altitudinal lapse rate of temperature (ALRT) distance from coast (DC) latitude macro-topography

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Analysis of Lower Tropospheric lapse Rate Trend over Port Harcourt Coastal City, Nigeria

引用

Atmospheric and Climate Sciences 2018年第2期8卷 134-142页

作者： Vincent E. Weli David O. Edokpa Department of Geography and Environmental Management University of Port Harcourt Port Harcourt Nigeria

Understanding the spatial distribution of temperature, especially the relationship between temperature and altitude, is essential for understanding both climatological and hydrological processes and their variabilities. This is because those processes are sensitive to air temperature, especially in sub humid tropical regions, where air temperature influences the movements of pollutants and controls exchanges of energy and water fluxes between land and atmosphere particularly within the lower troposphere. This study examined the trend of lower tropospheric lapse rate in the coastal area of Port Harcourt, Nigeria. Six years’ data (2010-2015) for temperature between 1000 mbar and 850 mbar pressure levels was retrieved from era-interim re-analysis platform for the analysis. The data was acquired at 6-hourly synoptic hours: 0000H, 0600H, 1200H and 1800H at 0.125° grid resolution. Findings from the computed environmental lapse rate (ELR) show that conditional instability with an annual lapse rate of 5.5°C/km persists at the area from January to December. It was revealed that the months of December and January constituted the highest ELR trends of 6.5°C/km and 5.9°C/km respectively. This indicates that the month of December assumes a normal tropospheric lapse rate trend. The average range of lapse rate trend in the area which is close to the moist adiabatic lapse rate (MALR) of 5.0°C/km than the dry adiabatic lapse rate (DALR) shows that the study atmospheric environment is rich in water vapour. The 6-hourly synoptic analysis of the ELR pattern shows that lapse rate range between 1°C/km - 6.4°C/km and 6.5°C/km - 10°C/km dominates throughout the year at 0000 - 0600 Hrs and 1200 - 1800 Hrs respectively. This demonstrates a higher and lower lapse rate trend during the day and night periods respectively. Relating study findings to the potential of air to disperse emissions in the area suggests that air emissions will be conveyed through far and near distances across the boundary layers due to the moderate dispersive potenti

关键词： lapse Rates Lower Troposphere Port Harcourt Emissions

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Media effects on the dynamics of a stochastic SIRI epidemic model with relapse and Lévy noise perturbation

引用

International Journal of Biomathematics 2019年第3期12卷 227-247页

作者： Badr-Eddine Berrhazi Mohamed El Fatini Roger Pettersson Aziz Laaribi Department of Mathematics Ibn To fail University BP 133 Kenitra Morocco Department of Mathematics Linnaeus University 351 95 Vaxjo Sweden Poly disciplinary Faculty Sultan Moulay Slimane University BP 592 Beni Mellal Morocco

In this paper, we study the dynamic properties of an SIRI epidemic model incorporating media coverage, and stochastically perturbed by a Lévy noise. We establish the existence of a unique global positive solution. We investigate the dynamic properties of the solution around both disease-free and endemic equilibria points of the deterministic model depending on the basic reproduction number under some noise excitation. Furthermore, we present some numerical simulations to support the theoretical results.

关键词： Dynamics Lévy process white noisere lapse media coverage

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Identifying Distinct Quitting Trajectories after an Unassisted Smoking Cessation Attempt: An Ecological Momentary Assessment Study

引用

Open Journal of Medical Psychology 2012年第3期1卷 44-50页

作者： Monica S. Bachmann Hansjorg Znoj Jeannette Brodbeck Department of Clinical Psychology and Psychotherapy Institute of Psychology University of Berne Berne Switzerland

Objectives: This study aimed at identifying distinct quitting trajectories over 29 days after an unassisted smoking ces- sation attempt by ecological momentary assessment (EMA). In order to validate these trajectories we tested if they predict smoking frequency up to six months later. Methods: EMA via mobile phones was used to collect real time data on smoking (yes/no) after an unassisted quit attempt over 29 days. Smoking frequency one, three and six months after the quit attempt was assessed with online questionnaires. Latent class growth modeling was used to analyze the data of 230 self-quitters. Results: Four different quitting trajectories emerged: quitter (43.9%), late quitter (11.3%), returner (17%) and persistent smoker (27.8%). The quitting trajectories predicted smoking frequency one, three and six months after the quit attempt (all p lapse. In line with the relapse model by Marlatt and Gordon, late quitter may have learned how to cope with lapses during one month after the quitting attempt. This group would have been allocated to the relapse group in traditional outcome studies.

关键词： Smoking Cessation lapse Relapse Process Ecological Momentary Assessment Self-Quitter

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Segmentation and Tracking of Neural Stem Cell

引用

Chinese Journal of Biomedical Engineering(English Edition) 2005年第3期14卷 93-103页

作者： Ewert Bengtsson Information & Communication Institute Harbin Engineering UniversityHarbin 150001China

In order to understand the development of stem cells into specialized mature cells it is necessary to study the growth of cells in culture. For this purpose it is very useful to have an efficient computerized cell tracking system. In this paper a prototype system for tracking neural stem cells in a sequence of images is described. In order to get reliable tracking results it is important to have good and robust segmentation of the cells. To achieve this we have implemented three levels of segmentation. The primary level, applied to all frames, is based on fuzzy threshold and watershed segmentation of a fuzzy gray weighted distance transformed image. The second level, applied to difficult frames where the first algorithm seems to have failed, is based on a fast geometric active contour model based on the level set algorithm. Finally, the automatic segmentation result on the crucial first frame can be interactively inspected and corrected. Visual inspection and correction can also be applied to other frames but this is generally not needed. For the tracking all cells are classified into inactive, active, dividing and clustered cells. Different algorithms are used to deal with the different cell categories. A special backtracking step is used to automatically correct for some common errors that appear in the initial forward tracking process.

关键词： Tracking Stem cells Level set Time lapse image sequence

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A DYNAMICAL ANALYSIS OF THE DEVELOPMENT OF:THE CUMULO-NIMBUS INCUS

引用

Science in China,Ser.A 1964年第11期 1885-1887页

作者：李兴生巢纪平胡隐樵 Institute of Geophysics and Meteorology Academia Sinica Institute of Geophysics and Meteorology Academia Sinica Department of Geophysics Peking University

It is found by observations that when the eumulus develops into its mature stagethe incus strueture of the toP of cumulus sometime:apPears and the cumulo一nimbus incusmay be warm eloud.In this Paper thed'amical macha... 详细信息

关键词： incus mature lapse coordinates minute 切二 intensified saturated noted summarized

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

NEUROLOGICAL DISORDER

引用

China Medical Abstracts(Internal Medicine) 1998年第4期15卷 225-227页

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

EXPLORATIVE STUDIES OF MESO-AND MICRO-SCALE SYSTEMS AND LEE WAVES OVER QOMOLANGMA FENG (MOUNT EVEREST)

引用

Chinese Science Bulletin 1982年第12期27卷 1305-1309页

作者：高登义刘增基严江征 Institute of Atmospheric Physics Academia Sinica Beijing

The existence of meso-and micro-scale systems at an elevation of 7500—9500m during the exploration of Mt. Qomolangma in May 1975 was made known. And it seems, from the conditions they cause, that there is a relations... 详细信息

关键词： OVER elevation Monas Everest formations favorable lapse verified spher released

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：