目的针对定期做全员核酸检测的单位,开发核酸团体检测全过程自动化系统,实现核酸检测从采样到手机查看报告全过程的自动化。方法采用PowerBuilder编程工具和Adaptive Server Anywhere(ASA)数据库开发该系统,个人信息以字典方式预先存储...目的针对定期做全员核酸检测的单位,开发核酸团体检测全过程自动化系统,实现核酸检测从采样到手机查看报告全过程的自动化。方法采用PowerBuilder编程工具和Adaptive Server Anywhere(ASA)数据库开发该系统,个人信息以字典方式预先存储在ASA数据库中,扫码仪扫读手机中的二维码,完成自动登记、自动计费、智能分组、自动打印试管条码、自动传递采样信息给实验室信息系统(Laboratory Information System,LIS)等一系列操作后,LIS根据试管信息和检测结果生成核酸检测报告。结果系统实现了核酸检测从采样到查看报告全过程中的自动化和信息化,总用时低于手工方式所用时长差异有统计学意义(P<0.05),核酸采样的工作效率比手工方式提高了82%。结论核酸团检工作全过程自动化系统能够满足核酸团检工作的需求,大大方便了参检人员,也提高了核酸检测各环节的工作效率,值得推广。展开更多
After the declaration of the first case of Legionnaire＇s disease in Cameroon in 2007, the Centre Pasteur of Cameroon implemented the detection method for Legionella. The introduction of this new method was put in pla...After the declaration of the first case of Legionnaire＇s disease in Cameroon in 2007, the Centre Pasteur of Cameroon implemented the detection method for Legionella. The introduction of this new method was put in places in order to investigate Legionella spp. colonization of water distribution systems （WDS） of large buildings including hospitals, hotels and Off Shore Exploitations Sites （OSES） in an attempt to identify risk factors for Legionella spp. Water systems of 6 hotels, 6 hospitals and 6 ships were investigated for the presence of Legionella spp.. A total of 130 samples were collected, 77 from hotels, 27 from hospitals and 26 from ships. 51 Legionella spp. were isolated from 41 （31.54%） water samples. Of a total of 51 positive isolates, 40/51 （78.4%） were L. pneumophila with 21 （52.5%） Legionellapneumophila serogroup （sg） 1, 16 （40%） L. pneumophila sg 5, 2 （5%） L. pneumophila sg 6, 1 （2.5%） L. pneumophila sg 7 and 11/51 Legionella spp. with 10 （90%） L. anisa, 1 （10%） Legionella dumoffii. 5 L. pneumophila sg 1 were associated with 5 L. pneumophila sg 5 and 4 L. pneumophila sg 1 were associated with 4 L. anisa. These results showed that WDS of hospitals, hotels and ships can be heavily colonized by Legionella spp. and may present a risk of Legionnaires＇ disease. Based on these preliminary results, we have just put in place a Legionella survey protocol in Cameroon.展开更多
A nanocomposite electrocatalyst was prepared with the method of cluster beam deposition of palladium nanoparticle thin lms on carbon nanoparticle supporting layers and used as sensitive nonenzyme hydrogen peroxide sen...A nanocomposite electrocatalyst was prepared with the method of cluster beam deposition of palladium nanoparticle thin lms on carbon nanoparticle supporting layers and used as sensitive nonenzyme hydrogen peroxide sensors. An enhancement on the electrocatalytic activity of the palladium nanoparticles toward H2O2 reduction was observed, which was related to the coverage of the carbon nanoparticles. With one monolayer of carbon nanoparticles, the H2O2 detection sensitivity reached the maximum, which was more than twice of that of the pure Pd nanoparticles.展开更多
Two definitions are given that Definitionl： an induced subgraph by a vertex vie G and its neighbors in G is defined as a vertex adjacent closed subgraph, and denoted by Qi （=G[V（Nvi）]）, with the vertex vi called ...Two definitions are given that Definitionl： an induced subgraph by a vertex vie G and its neighbors in G is defined as a vertex adjacent closed subgraph, and denoted by Qi （=G[V（Nvi）]）, with the vertex vi called the hub; and Definition2： A r（k,I）-I vertices graph is called the （k,l）-Ramsey graph, denoted by RG（k,1）, if RG（k,1） only contains cliques Kk.1 and the intersect QiNQj of any two nonadjacent vertices vi and vj of RG（k,I） contains only Kk-2. Meanwhile, the RG（k,l）＇s complement RG（I,k） contains only cliques Kl.l, and the intersect QiNQj of any two nonadjacent vertices vi and vj of RG（I,k） contains only Ki.2. On the basis of those definitions, two theorems are put forward and proved in this paper. They are Theoreml： the biggest clique in G is contained in some Qi of G, and Theorem 2： r（k,1） = [V（RG（k,I））I ＋ 1. With those definitions and theorems as well as analysis of chord property, a method for quick inspection and building RG（k,1） is proposed. Accordingly, RG（4,6） is built, it is a strongly 14-regular graph on order 35. We have tested RG（4,6） and its complement, as a result, they meet the defintion2, so we proclaim that r（4,6）=36.展开更多
The aim of this paper is to investigate the damage cracking characteristics of rock and soil aggregate(RSA)by X-ray computed tomography(CT)under uniaxial compressive loading.The mean CT value for the region of interes...The aim of this paper is to investigate the damage cracking characteristics of rock and soil aggregate(RSA)by X-ray computed tomography(CT)under uniaxial compressive loading.The mean CT value for the region of interest(ROI)is used to analyze the cracking characteristics.Also,the mathematical morphology method based on the image threshold segmentation is used to obtain characteristic parameters of cracks to describe the cracking evolution of RSA.Results show that the elastic mismatch between rock blocks and soil matrix is the primary reason for RSA cracking.The mean CT value for the RSA specimen,rock block inclusions,and their adjacent soil regions decreases with the increasing stress level.However,it is more sensitive for block inclusions than soil regions.Using the image segmentation method,length,area and mean width of cracks obey to power function distribution.Crack statistical characteristics are closely related to the rock block’s distribution and morphology.These results may be useful to reveal the mesoscopic cracking mechanism,establish meso-damage evolution equation,and constitutive relation for RSA.展开更多
Keyword search is an alternative for structured languages in querying graph-structured data.A result to a keyword query is a connected structure covering all or part of the queried keywords.The textual coverage and st...Keyword search is an alternative for structured languages in querying graph-structured data.A result to a keyword query is a connected structure covering all or part of the queried keywords.The textual coverage and structural compactness have been known as the two main properties of a relevant result to a keyword query.Many previous works examined these properties after retrieving all of the candidate results using a ranking function in a comparative manner.However,this needs a time-consuming search process,which is not appropriate for an interactive system in which the user expects results in the least possible time.This problem has been addressed in recent works by confining the shape of results to examine their coverage and compactness during the search.However,these methods still suffer from the existence of redundant nodes in the retrieved results.In this paper,we introduce the semantic of minimal covered r-clique(MCCr)for the results of a keyword query as an extended model of existing definitions.We propose some efficient algorithms to detect the MCCrs of a given query.These algorithms can retrieve a comprehensive set of non-duplicate MCCrs in response to a keyword query.In addition,these algorithms can be executed in a distributive manner,which makes them outstanding in the field of keyword search.We also propose the approximate versions of these algorithms to retrieve the top-k approximate MCCrs in a polynomial delay.It is proved that the approximate algorithms can retrieve results in two-approximation.Extensive experiments on two real-world datasets confirm the efficiency and effectiveness of the proposed algorithms.展开更多
文摘目的针对定期做全员核酸检测的单位,开发核酸团体检测全过程自动化系统,实现核酸检测从采样到手机查看报告全过程的自动化。方法采用PowerBuilder编程工具和Adaptive Server Anywhere(ASA)数据库开发该系统,个人信息以字典方式预先存储在ASA数据库中,扫码仪扫读手机中的二维码,完成自动登记、自动计费、智能分组、自动打印试管条码、自动传递采样信息给实验室信息系统(Laboratory Information System,LIS)等一系列操作后,LIS根据试管信息和检测结果生成核酸检测报告。结果系统实现了核酸检测从采样到查看报告全过程中的自动化和信息化,总用时低于手工方式所用时长差异有统计学意义(P<0.05),核酸采样的工作效率比手工方式提高了82%。结论核酸团检工作全过程自动化系统能够满足核酸团检工作的需求,大大方便了参检人员,也提高了核酸检测各环节的工作效率,值得推广。
文摘After the declaration of the first case of Legionnaire＇s disease in Cameroon in 2007, the Centre Pasteur of Cameroon implemented the detection method for Legionella. The introduction of this new method was put in places in order to investigate Legionella spp. colonization of water distribution systems （WDS） of large buildings including hospitals, hotels and Off Shore Exploitations Sites （OSES） in an attempt to identify risk factors for Legionella spp. Water systems of 6 hotels, 6 hospitals and 6 ships were investigated for the presence of Legionella spp.. A total of 130 samples were collected, 77 from hotels, 27 from hospitals and 26 from ships. 51 Legionella spp. were isolated from 41 （31.54%） water samples. Of a total of 51 positive isolates, 40/51 （78.4%） were L. pneumophila with 21 （52.5%） Legionellapneumophila serogroup （sg） 1, 16 （40%） L. pneumophila sg 5, 2 （5%） L. pneumophila sg 6, 1 （2.5%） L. pneumophila sg 7 and 11/51 Legionella spp. with 10 （90%） L. anisa, 1 （10%） Legionella dumoffii. 5 L. pneumophila sg 1 were associated with 5 L. pneumophila sg 5 and 4 L. pneumophila sg 1 were associated with 4 L. anisa. These results showed that WDS of hospitals, hotels and ships can be heavily colonized by Legionella spp. and may present a risk of Legionnaires＇ disease. Based on these preliminary results, we have just put in place a Legionella survey protocol in Cameroon.
基金supported by the National Natural Science Foundation of China(No.11627806 and No.61301015)supported by a Project funded by the Priority Academic Programme Development of Jiangsu Higher Education Institutions
文摘A nanocomposite electrocatalyst was prepared with the method of cluster beam deposition of palladium nanoparticle thin lms on carbon nanoparticle supporting layers and used as sensitive nonenzyme hydrogen peroxide sensors. An enhancement on the electrocatalytic activity of the palladium nanoparticles toward H2O2 reduction was observed, which was related to the coverage of the carbon nanoparticles. With one monolayer of carbon nanoparticles, the H2O2 detection sensitivity reached the maximum, which was more than twice of that of the pure Pd nanoparticles.
文摘Two definitions are given that Definitionl： an induced subgraph by a vertex vie G and its neighbors in G is defined as a vertex adjacent closed subgraph, and denoted by Qi （=G[V（Nvi）]）, with the vertex vi called the hub; and Definition2： A r（k,I）-I vertices graph is called the （k,l）-Ramsey graph, denoted by RG（k,1）, if RG（k,1） only contains cliques Kk.1 and the intersect QiNQj of any two nonadjacent vertices vi and vj of RG（k,I） contains only Kk-2. Meanwhile, the RG（k,l）＇s complement RG（I,k） contains only cliques Kl.l, and the intersect QiNQj of any two nonadjacent vertices vi and vj of RG（I,k） contains only Ki.2. On the basis of those definitions, two theorems are put forward and proved in this paper. They are Theoreml： the biggest clique in G is contained in some Qi of G, and Theorem 2： r（k,1） = [V（RG（k,I））I ＋ 1. With those definitions and theorems as well as analysis of chord property, a method for quick inspection and building RG（k,1） is proposed. Accordingly, RG（4,6） is built, it is a strongly 14-regular graph on order 35. We have tested RG（4,6） and its complement, as a result, they meet the defintion2, so we proclaim that r（4,6）=36.
基金supported by the National Natural Science Foundation of China(Grants Nos.41227901,41027001,and 41027001)the Strategic Priority Research Program of the Chinese Academy of Sciences(Grants Nos.XDB10030000,XDB10030300 and XDB10050400)
文摘The aim of this paper is to investigate the damage cracking characteristics of rock and soil aggregate(RSA)by X-ray computed tomography(CT)under uniaxial compressive loading.The mean CT value for the region of interest(ROI)is used to analyze the cracking characteristics.Also,the mathematical morphology method based on the image threshold segmentation is used to obtain characteristic parameters of cracks to describe the cracking evolution of RSA.Results show that the elastic mismatch between rock blocks and soil matrix is the primary reason for RSA cracking.The mean CT value for the RSA specimen,rock block inclusions,and their adjacent soil regions decreases with the increasing stress level.However,it is more sensitive for block inclusions than soil regions.Using the image segmentation method,length,area and mean width of cracks obey to power function distribution.Crack statistical characteristics are closely related to the rock block’s distribution and morphology.These results may be useful to reveal the mesoscopic cracking mechanism,establish meso-damage evolution equation,and constitutive relation for RSA.
文摘Keyword search is an alternative for structured languages in querying graph-structured data.A result to a keyword query is a connected structure covering all or part of the queried keywords.The textual coverage and structural compactness have been known as the two main properties of a relevant result to a keyword query.Many previous works examined these properties after retrieving all of the candidate results using a ranking function in a comparative manner.However,this needs a time-consuming search process,which is not appropriate for an interactive system in which the user expects results in the least possible time.This problem has been addressed in recent works by confining the shape of results to examine their coverage and compactness during the search.However,these methods still suffer from the existence of redundant nodes in the retrieved results.In this paper,we introduce the semantic of minimal covered r-clique(MCCr)for the results of a keyword query as an extended model of existing definitions.We propose some efficient algorithms to detect the MCCrs of a given query.These algorithms can retrieve a comprehensive set of non-duplicate MCCrs in response to a keyword query.In addition,these algorithms can be executed in a distributive manner,which makes them outstanding in the field of keyword search.We also propose the approximate versions of these algorithms to retrieve the top-k approximate MCCrs in a polynomial delay.It is proved that the approximate algorithms can retrieve results in two-approximation.Extensive experiments on two real-world datasets confirm the efficiency and effectiveness of the proposed algorithms.
