检索结果-南通市图书馆

同方期刊数据库

Risk factors for carotid plaque progression after optimising the risk factor treatment: substudy results of the Atherosclerotic Plaque Characteristics Associated with a Progression Rate of the Plaque and a Risk of Stroke in Patients with the carotid Bifurcation Plaque Study (ANTIQUE)

在线全文

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2022年第2期7卷 132-139页

作者： David Školoudik Petra Kešnerova Tomaš Hrbač David Netuka Jaroslav Vomačka kateřina Langova Roman Herzig Tomaš Belšan Center for Health Research Faculty of MedicineUniversity of OstravaOstravaCzech Republic Department of Neurology University Hospital OstravaOstravaCzech Republic Department of Neurology Second Faculty of MedicineCharles UniversityPrahaCzech Republic Department of Neurology Motol University HospitalPrahaCzech Republic Department of Neurosurgery Faculty of MedicineUniversity of OstravaOstravaCzech Republic Department of Neurosurgery University Hospital OstravaOstravaCzech Republic Department of Neurosurgery Military University Hospital PraguePrahaCzech Republic Department of Radiological Assistance Faculty of Health SciencesPalacky University OlomoucOlomoucCzech Republic Deaprtment of Radiology University Hospital OlomoucOlomoucCzech Republic Department of Biophysics Faculty of MedicinePalacky University OlomoucOlomoucCzech Republic Department of Neurology University Hospital Hradec KrálovéHradec KraloveCzech Republic Department of Neurology Faculty of Medicine in Hradec KrálovéCharles UniversityHradec KrálovéCzech Republic Department of Radiology Military University Hospital PraguePrahaCzech Republic

Background and aim Carotid plaque progression contributes to increasing stroke *** study aims to identify factors influencing carotid plaque thickness progression after changing the preventive treatment to the‘treating arteries instead of risk factors’strategy,that is,change in treatment depending on the progression of *** The study participants who completed sonographic controls over the course of 3 years were enrolled to the *** sonography of cervical arteries was performed in 6-month intervals with measurement of carotid plaque *** thickness measurement error(σ)was set as 3 *** evidently stable and progressive plaques(defined as plaque thickness difference between initial and final measurements of˂σand>2σ,respectively)were included to *** and multivariate logistic regression analysis was performed to identify factors influencing plaque *** A total of 1391 patients(466 males,age 67.2±9.2 years)were enrolled in the *** plaque in at least one carotid artery was detected in 255(18.3%)*** age,male sex,greater plaque thickness,coronary heart disease,vascular surgery/stenting history and smoking were more frequently present in patients with progressive plaque(p˂0.05 in all cases).Multivariate logistic regression analysis identified only the plaque thickness(OR 1.850 for left side,95%CI 1.398 to 2.449;and OR 1.376 for right side,95%CI 1.070 to 1.770)as an independent factor influencing plaque *** Carotid plaque thickness corresponding to stenosis severity is the only independent risk factor for plaque thickness progression after optimising the prevention treatment.

关键词： prevention treatment Duplex

Research of Mechanical and Thermal Properties of Composite Material Based on Gypsum and Straw

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

Journal of Renewable Materials 2022年第7期10卷 1859-1873页

作者： Nikola Vavřínová kateřina Stejskalová JiříTeslík kateřina Kubenková JiříMajer Faculty of Civil Engineering VSB-Technical University of OstravaOstrava70800Czech Republic

This article is focused on the investigation of the mechanical and thermal properties of composite material that could be used for the production of plaster or *** composite material is made of gypsum and reinforcing natural *** article verifies whether this natural reinforcement can improve the investigated properties compared to conventional plasters and gypsum plasterboards made of pure *** this composite material,high-strength plasterboards could then be produced,which meet the higher demands of users than conventional gypsum *** their production,natural waste materials would be used *** part of the development of new building materials,it is necessary to specify essential characteristics for their later use in civil *** wheat straw and three gypsum classes with strengths G2(2 MPa)—gypsum Class I.,G5(5 MPa)—gypsum Class *** G16(16 MPa)—gypsum Class *** used to create the test *** were made with different ratios of the two ingredients,with the percentages of straw being 0%,2.5%,and 5%for each gypsum *** first part of the article describes how the increasing proportion of straw affects the composite’s mechanical properties(flexural strength and compressive strength).The second part of the article focuses on the change of thermal properties(thermal conductivity and specific heat capacity).The last part of the article mentions the verification of the fire properties(single-flame source fire test and gross heat of combustion)of this composite *** research has shown that the increasing proportion of straw reinforcement caused a deterioration in the flexural strength(up to 56.49%in the *** of gypsum Class II.)and compressive strength(up to 80.27%in the *** of gypsum Class III.)and an improvement in the specific heat capacity and thermal conductivity(up to 31.40%in the ***).This composite material is thus not suitable for the production of high-streng

关键词： Composite material gypsum plasterboard crushed straw flexural strength compressive strength thermal conductivity specific heat capacity ignitability gross heat of combustion

Tribonacci Partition Formulas Modulo m

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

Acta Mathematica Sinica,English Series 2010年第3期26卷 465-476页

作者： Ji■í KLA■ka Institute of Mathematics Brno University of Technology

Each Tribonacci sequence starting with an arbitrary triple of integers is periodic modulo m for any modulus m 〉 1. For a given m, the mapping between the set S of all m^3 triples of initial values and the set of their coresponding periods define a partition of the set S. In this paper we shall investigate some basic questions related to these partitions from the point of view of enumerative combinatorics.

关键词： Tribonacci sequence modular periodicity partition formulas

Computational design of structured chemical products

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2021年第5期15卷 1033-1049页

作者： Faheem Mushtaq Xiang Zhang ka Y.Fung ka M.Ng Department of Chemical and Biological Engineering The Hong Kong University of Science and TechnologyHong KongChina

In chemical product design,the aim is to formulate a product with desired *** and internal product structure are two key drivers of product performance with direct impact on the mechanical,electrical,and thermal ***,there is a keen interest in elucidating the dependence of product performance on ingredients,structure,and the manufacturing process to form the *** of product structure,particularly microstructure,is an intrinsically complex problem that involves different phases of different physicochemical properties,mass fraction,morphology,size distribution,and ***,computational methods have emerged that assist systematic microstructure quantification and *** objective of this paper is to review these computational methods and to show how these methods as well as other developments in product design can work seamlessly in a proposed performance,ingredients,structure,and manufacturing process framework for the design of structured chemical *** begins with the desired target properties and key *** is followed by computation for microstructure and then selection of processing steps to realize this *** framework is illustrated with the design of nanodielectric and die attach adhesive products.

关键词： product design performance ingredients structure manufacturing process framework structured chemical products microstructure design

All-parameters Rayleigh wave inversion

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2021年第2期20卷 517-534页

作者： Xiao-Hui Yang ka-Veng Yuen State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering University of MacaoMacao 999078China

Since S-wave velocity of the subsurface is an important parameter in near surface applications,many studies have been conducted for its *** the various methods that use surface waves or body waves,Rayleigh wave inversion is the most *** practice,the densities and P-wave velocities of different layers are usually assumed to be known to avoid ill-posed problems,as they have less influence on the dispersion ***,improper assignment of these two groups of parameters leads to inaccurate estimation of the S-wave velocity *** order to address this problem,the all-parameters Rayleigh wave inversion strategy is proposed in which the S-wave velocities,layer thicknesses,densities and P-wave velocities of different layers are included as the unknown parameters for ***,the transitional Markov Chain Monte Carlo(TMCMC)algorithm is applied for the implementation of all-parameters Rayleigh wave *** simulated example and two real-test applications are demonstrated to verify the capability of the proposed method in the estimation of the S-wave velocity profile,the densities and the P-wave ***,it is verified that the proposed method achieved more accurate S-wave velocity profile estimation than the traditional approach.

关键词： all-parameters Rayleigh wave inversion Bayesian S-wave velocity profile TMCMC algorithm uncertainty quantification

The Most General Corrdinate Transformation Between the Hydrogen Atom and Harmonic Oscillator in Arbitrary Dimensions

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1997年第10期14卷 721-723页

作者： SU ka-lin Department of Physics Yueyang Normal CollegeYueyang 414000

In this paper,we find out the most general coordinate transformation between a d-dimensional hydrogen atom and a D-dimensional harmonic oscillator by means of the SU(1,l)*** other words,the generalized Kustaanheimo-St... 详细信息

关键词： algebra Transformation coordinate

Bayesian Rayleigh wave inversion with an unknown number of layers

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

Earthquake Engineering and Engineering Vibration 2020年第4期19卷 875-886页

作者： ka-Veng Yuen Xiao-Hui Yang State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering University of Macao999078MacaoChina

Surface wave methods have received much attention due to their efficient, flexible and convenient characteristics. However, there are still critical issues regarding a key step in surface wave inversion. In most existing methods, the number of layers is assumed to be known prior to the process of inversion. However, improper assignment of this parameter leads to erroneous inversion results. A Bayesian nonparametric method for Rayleigh wave inversion is proposed herein to address this problem. In this method, each model class represents a particular number of layers with unknown S-wave velocity and thickness of each layer. As a result, determination of the number of layers is equivalent to selection of the most applicable model class. Regarding each model class, the optimization search of S-wave velocity and thickness of each layer is implemented by using a genetic algorithm. Then, each model class is assessed in view of its efficiency under the Bayesian framework and the most efficient class is selected. Simulated and actual examples verify that the proposed Bayesian nonparametric approach is reliable and efficient for Rayleigh wave inversion, especially for its capability to determine the number of layers.

关键词： Bayesian model class selection generalized r/t coefficients algorithm genetic algorithm inversion of Rayleigh wave number of layers

Halogen-specific total organic halogen analysis： Assessment by recovery of total bromine

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第8期29卷 340-348页

作者： Markus Langsa Sebastien Allard ina Kristiana Anna Heitz Cynthia A.Joll Curtin Water Quality Research Centre Department of Chemistry Curtin University Perth Western Australia 6102 Australia Department of Civil Engineering Curtin University Perth Western Australia 6102 Australia Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan AlamUniversitas PapuaManokwaripapua Barat 98314Indonesia

Determination of halogen-specific total organic halogen（TOX） is vital for studies of disinfection of waters containing bromide, since total organic bromine（TOBr） is likely to be more problematic than total organic chlorine. Here, we present further halogen-specific TOX method optimisation and validation, focusing on measurement of TOBr. The optimised halogen-specific TOX method was validated based on the recovery of model compounds covering different classes of disinfection by-products（haloacetic acids, haloacetonitriles,halophenols and halogenated benzenes） and the recovery of total bromine（mass balance of TOBr and bromide concentrations） during disinfection of waters containing dissolved organic matter and bromide. The validation of a halogen-specific TOX method based on the mass balance of total bromine has not previously been reported. Very good recoveries of organic halogen from all model compounds were obtained, indicating high or complete conversion of all organic halogen in the model compound solution through to halide in the absorber solution for ion chromatography analysis. The method was also successfully applied to monitor conversion of bromide to TOBr in a groundwater treatment plant. An excellent recovery（101%）of total bromine was observed from the raw water to the post-chlorination stage. Excellent recoveries of total bromine（92%–95%） were also obtained from chlorination of a synthetic water containing dissolved organic matter and bromide, demonstrating the validity of the halogen-specific TOX method for TOBr measurement. The halogen-specific TOX method is an important tool to monitor and better understand the formation of halogenated organic compounds, in particular brominated organic compounds, in drinking water systems.

关键词： Total organic bromine Dissolved organic matter Bromide Chlorination Drinking water Health effects

Modeling of environmental influence in structural health assessment for reinforced concrete buildings

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2010年第2期9卷 295-306页

作者： ka-Veng Yuen Sin-Chi Kuok Department of Civil and Environmental Engineering Univeristy of Macao

One branch of structural health monitoring (SHM) utilizes dynamic response measurements to assess the structural integrity of civil infrastructures. In particular,modal frequency is a widely adopted indicator for structural damage since its square is proportional to structural stiffness. However,it has been demonstrated in various SHM projects that this indicator is substantially affected by fluctuating environmental conditions. In order to provide reliable and consistent information on the health status of the monitored structures,it is necessary to develop a method to filter this interference. This study attempts to model and quantify the environmental influence on the modal frequencies of reinforced concrete buildings. Daily structural response measurements of a twenty-two story reinforced concrete building were collected and analyzed over a one-year period. The Bayesian spectral density approach was utilized to identify the modal frequencies of this building and it was clearly seen that the temperature and humidity fluctuation induced notable variations. A mathematical model was developed to quantify the environmental effects and model complexity was taken into consideration. Based on a Timoshenko beam model,the full model class was constructed and other reduced-order model class candidates were obtained. Then,the Bayesian modal class selection approach was employed to select the one with the most suitable complexity. The proposed model successfully characterizes the environmental influence on the modal frequencies. Furthermore,the estimated uncertainty of the model parameters allows for assessment of the reliability of the prediction. This study not only improves the understanding about the monitored structure,but also establishes a systematic approach for reliable health assessment of reinforced concrete buildings.

关键词： Bayesian inference model selection reinforced concrete building structural health monitoring temperature and humidity effects Timoshenko beam