检索结果-南通市图书馆

Deliberation between PM1 and PM2.5 as air quality indicators based on comprehensive characterization of urban aerosols in Bangkok, Thailand

引用

Particuology 2017年第6期15卷 1-9页

作者： Issariya Vejpongsa Sirikalaya Suvachittanont Natsucla Klinklan Thunyapat Thongyen miklos veres Wladyslaw W. Szymanski Department of Chemical Engineering Kasetsart University Bangkok Thailand Kasetsart University Bangkok Thailand Wigner Centre for Physics of the Hungarian Academy of Sciences Budapest Hungary Faculty of Physics University of Vienna Vienna Austria

Urban ambient aerosols in the size range below 10 μm were measured and sampled for further evalua- tion （by Raman and Thermal-Optical analysis） of the collected material. The presented data shows that monitoring number and/or surface area concentrations besides the mass concentration provides valu- able information for a meaningful assessment of the actual ambient air quality. The aim of the study was to characterize the urban aerosols using various instruments, methods, and sampling conditions, and to determine whether a split of the PMzs size fraction at PM1 may deliver a more sensible indication of the actual air quality than the current standard of monitoring PMzs. We found substantial differences relating to this split. PM2.5 data frequently include particles from both mechanical and combustion processes, PM1 measurements can be used to better distinguish particles derived from these two sources. We measured number concentrations of PM1 with PM2.5-1 concurrently with particle mass concentration and found that the typical average particle diameter by mass in the urban aerosols investigated was in the range of 120 nm; this corresponded well with the particle number size distributions measured in real time. Raman spectral analysis and thermal-optical evaluation of the sampled material also suggested that it would be sensible to split the measurement of the PM2.5 fraction into PM1 and PM2.s-1 size fractions, especially for analysis of carbonaceous aerosol components using the DRI thermal/optical reflectance carbon analysis system

关键词： Urban aerosol PM-ffactions Carbonaceous particles Raman spectroscopy Thermal-optical analysis

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

Dual Effects of Photo-Darkening and Photo-Bleaching in Ge-Se Films

引用

材料科学与工程（中英文A版） 2015年第1期5卷 78-86页

作者： Istvan Csarnovics Muhamma Rizwa Latif Tyler Nichol Wan Kuang Maria Mitkova miklos veres Sandor Kokenyesi Department of Experimental Physics University of Debrecen Debrecen 4026 Hungary Department of Electrical and Computer Engineering Boise State University Boise ID 83725-2075 USA Institute of Solid State Physics and Optics Wigner RCP HAS Budapest 1121 Hungary Department of Electrical Engineering University ofDebrecen Debrecen 4026 Hungary.

Photo-induced changes are investigated in thermally evaporated GexSe1-x (x = 0.28, 0.33 and 0.40) films. Object of studies are fresh (as prepared), as well as annealed films. The studies indicated concentration dependence of the occurring effects for the studied compositions. Fast photo-darkening and slow photo-bleaching processes due to laser irradiation were detected in as-prepared films, while only photo-darkening effect was established for annealed samples. The origin of photo-darkening and photo-bleaching is explained based on the structural investigations carried out by Raman spectroscopy.

关键词：薄膜变黑照片光漂白浓度依赖性漂白工艺激光照射结构调查

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

The effect of melt flow induced by RMF on the meso-and micro-structure of unidirectionally solidified Al–7wt.%Si alloy Benchmark experiment under magnetic stirring

引用

Journal of Materials Science & Technology 2022年第8期103卷 197-208页

作者： Zs.veres A.Roósz A.Rónaföldi A.Sycheva M.Svéda University of Miskolc Institute of Physical MetallurgyMetal Forming and Nanotechnology(UM)Hungary MTA-ME Materials Science Research Group ELKHHungary

During the last two decades,many algorithms were developed to simulate the solidification process for different casting methods like ingots,continuous casting of steel and the direct chill cast of *** performed under exactly known conditions and with the detailed knowledge of meso-and micro-structures are required for validating these *** aim of this paper is to give a data set to validate these *** solidification experiments were performed by using a rotating magnetic field(RMF)to study the effect of melt flow on the solidified micro-and meso-structure of the Al-7wt.%Si binary *** first and the third 1/3 parts of samples were solidified without magnetic stirring,and the second(middle)1/3 part was solidified by using magnetic *** magnetic induction was 10 m T,the temperature gradient was~7 K/mm,and the sample movement velocity was 0.1 mm/*** the longitudinal section of the sample,the columnar/equiaxed transition(CET),the equiaxed/columnar transition(ECT),the secondary dendrite arm spacing(SDAS),and the macrosegregation(concentration distribution and the amount of eutectic)were *** primary dendrite arm spacing(PDAS)and the grain structure were studied on the cross-section after color etching.

关键词： Al–7wt.%Si alloy Unidirectional solidification RMF magnetic stirring Meso-and microstructure

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

Comparison of linear and nonlinear aerodynamic parameter estimation approaches for an unmanned aerial vehicle using unscented Kalman filter

引用

Journal of Beijing Institute of Technology 2011年第3期20卷 339-344页

作者：李蒙刘莉 S.M.veres School of Aerospace Engineering Beijing Institute of Technology School of Engineering Sciences University of Southampton

Aerodynamic parameter estimation provides an effective way for aerospace system modeling using measured data from flight tests, especially for the purpose of developing elaborate simulation environments and designing control systems of unmanned aerial vehicle （UAV） with short design cycles and reduced cost. However, parameter identification of airplane dynamics by nonlinear mod- els is complicated because of the noisy and biased sensor measurements. Using linear models for system identification is an alternative way if the fidelity can be guaranteed, as control design procedures are better established in linear systems. This paper considers the application and comparison of linear as well as nonlinear aerodynamic parameter estimation approaches of an UAV using unscented Kalman filter （UKF）. It also highlights the degree of deterioration of the linear model in the UKF identification process. The results show that both the linear and nonlinear methodologies can accurately estimate the control system design. Furthermore, considering loss of accuracy to be negligible, the linear model can be employed for control design of the UAV as presented here.

关键词： unmanned aerial vehicle aerodynamic parameter estimation unscented Kalman filter

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

Robustness assessment for flight control system of an oceanographic unmanned aerial vehicle

引用

Journal of Beijing Institute of Technology 2011年第2期20卷 158-167页

作者：李蒙刘莉 veres S. M. School of Aerospace Engineering Beijing Institute of Technology School of Engineering Sciences University of Southampton Southampton SO17 1BJ UK

A post-design robustness assessment for the longitudinal flight control system of an oceanographic unmanned aerial vehicle （UAV） is presented in this paper. Two novel systematic approaches of generating the linear fractional transformation （LFT） model directly from nonlinear equations are proposed for this particular robustness analysis problem. The closed-loop system combined with each controller is used to determine combinations of aerodynamic parameters that result in worst-case performance. Classical simultaneous gain and phase margin stability metrics currently used in the aerospace industry are introduced for the certification of robustness of this uncertain multivariable system. The results show that the control system remains stable and achieves desired performance for all possible parameter variations over a specified range in both frequency domain and time domain.

关键词： robustness linear fractional transformation worst-case simultaneous gain and phase margins

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

Anti-microbial antibodies in celiac disease:Trick or treat?

引用

World Journal of Gastroenterology 2009年第31期15卷 3891-3900页

作者： Maria Papp Ildiko Foldi Istvan Altorjay Eszter Palyu miklos Udvardy Judit Tumpek Sandor Sipka Ilma Rita Korponay-Szabo Eva Nemes Gabor veres Tamas Dinya Attila Tordai Hajnalka Andrikovics Gary L Norman Peter Laszlo Lakatos 2nd Department of Medicine University of Debrecen Laboratory of Clinical Immunology University of Debrecen Department of Pediatrics University of DebrecenDebrecenH-4032HungaryIlma Rita Korponay-SzaboCeliac Disease CenterHeim Pal Children's Hospital 1st Department of Pediatrics Semmelweis University Institute of Surgery University of Debrecen Department of Molecular Diagnostics Hungarian National Blood Transfusion Service INOVA Diagnostics Inc. 1st Department of Medicine Semmelweis University

AIM:To determine the prevalence of a new set of anti-glycan and anti-outer membrane protein (anti-OMP) antibodies in a Hungarian cohort of adult Celiac disease (CD) ***:190 consecutive CD patients [M/F:71/119, age:39.9 (SD:14.1) years], 100 healthy, and 48 gastrointestinal controls were tested for glycan anti-Saccharomyces cerevisiae (gASCA), anti-laminaribioside (ALCA), anti-chitobioside, anti-mannobioside, anti-OMP antibodies and major NOD2/CARD15 mutations. Thirty out of 82 CD patients enrolled at the time of diagnosis were re-evaluated for the same antibodies after longstanding gluten-free diet (GFD).RESULTS: 65.9% of the CD patients were positive for at least one of the tested antibodies at the time of the diagnosis. Except anti-OMP and ALCA, anti-microbial antibodies were exclusively seen in untreated CD; however, the overall sensitivity was low. Any glycan positivity (LR+:3.13;95% CI:2.08-4.73) was associated with an increased likelihood ratio for diagnosing CD. Significant correlation was found between the levels of anti-glycan and anti-endomysial or anti-transglutaminase antibodies. Anti-glycan positivity was lost after longstanding GFD. Anti-glycan antibody titers were associated with symptoms at presentation, but not the presence of NOD2/CARD15 mutations. Patients with severe malabsorption more frequently had multiple antibodies at diagnosis (P=0.019).CONCLUSION: The presence of anti-glycan antibodies in CD seems to be secondary to the impaired small bowel mucosa which can lead to increased antigen presentation. Furthermore, anti-glycan positivity may be considered an additional marker of CD and dietary adherence.

关键词：抗微生物疾病腹腔抗体蛋糖

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

One in four patients with gastrointestinal bleeding develops shock or hemodynamic instability:A systematic review and meta-analysis

引用

World Journal of Gastroenterology 2023年第28期29卷 4466-4480页

作者： Mahmoud Obeidat Brigitta Teutsch Anett Rancz Edina Tari Katalin Márta Dániel Sándor veres Nóra Hosszúfalusi Emese Mihály Péter Hegyi Bálint Erőss Centre for Translational Medicine Semmelweis UniversityBudapest 1085Hungary Institute for Translational Medicine Medical SchoolUniversity of PécsPécs 7623Hungary Department of Internal Medicine and Hematology Semmelweis UniversityFaculty of MedicineBudapest 1085Hungary Institute of Pancreatic Diseases Semmelweis UniversityBudapest 1083Hungary Department of Biophysics and Radiation Biology Semmelweis UniversityBudapest 1085Hungary

BACKGROUND Hemodynamic instability and shock are associated with untoward outcomes in gastrointestinal ***,there are no studies in the existing literature on the proportion of patients who developed these outcomes after gastrointestinal *** To determine the pooled event rates in the available literature and specify them based on the bleeding *** The protocol was registered on PROSPERO in advance(CRD42021283258).A systematic search was performed in three databases(PubMed,EMBASE,and CENTRAL)on 14^(th) October *** proportions with 95%CI were calculated with a random-effects model.A subgroup analysis was carried out based on the time of assessment(on admission or during hospital stay).Heterogeneity was assessed by Higgins and Thompson’s I^(2) *** Joanna Briggs Institute Prevalence Critical Appraisal Tool was used for the risk of bias *** Reference Citation Analysis(https://***/)tool was applied to obtain the latest highlight *** We identified 11589 records,of which 220 studies were eligible for data *** overall proportion of shock and hemodynamic instability in general gastrointestinal bleeding patients was 0.25(95%CI:0.17-0.36,I^(2)=100%).In non-variceal bleeding,the proportion was 0.22(95%CI:0.14-0.31,I^(2)=100%),whereas it was 0.25(95%CI:0.19-0.32,I^(2)=100%)in variceal *** proportion of patients with colonic diverticular bleeding who developed shock or hemodynamic instability was 0.12(95%CI:0.06-0.22,I^(2)=90%).The risk of bias was low,and heterogeneity was high in all *** One in five,one in four,and one in eight patients develops shock or hemodynamic instability on admission or during hospitalization in the case of non-variceal,variceal,and colonic diverticular bleeding,respectively.

关键词： Gastrointestinal bleeding Hemodynamic instability Shock Meta-analysis Statistics Review

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

A stability-indicating high performance liquid chromatography method to determine apocynin in nanoparticles

引用

Journal of Pharmaceutical Analysis 2017年第2期7卷 129-133页

作者： Juliana Kovalczuk de Oliveira Débora Fernanda veres Ronik Jociani Ascari Rubiana Mara Mainardes Najeh Maissar Khalil Department of Pharmacy Laboratory of Pharmaceutical NanotechnologyUniversidade Estadual do Centro-OesteRua Simeao Camargo Varelade Sá.85040-080 GuarapuavaBrazil Department of Biological Sciences Universidade Tecnológica Federal do ParanáRua Cerejeiras S/N85892-000 Santa HelenaPRBrazil

In this study, we developed and validated a fast, specific, sensitive, precise and stability-indicating high performance liquid chromatography（HPLC） method to determine the drug apocynin in bovine serum albumin（BSA） nanoparticles. Chromatographic analyses were performed on an RP C18 column and using a photodiode array detector at a wavelength of 276 nm. Mobile phase consisted of a mixture of acetonitrile and 1% acetic acid（60：40, v/v）, and it was eluted isocratically at a flow rate of 0.8 mL/min. The retention time of apocynin chromatographic peak was 1.65 min. The method was linear, precise, accurate and specific in the range of 5–100 μg/mL. The intra-and inter-day precisions presented relative standard deviation（RSD） values lower than 2%. The method was robust regarding changes in mobile phase proportion, but not for flow rate. Limits of detection and quantitation were 78 ng/mL and 238 ng/mL, respectively. Apocynin was exposed to acid and alkali hydrolysis, oxidation and visible light. The drug suffered mild degradation under acid and oxidation conditions and great degradation under alkali conditions. Light exposure did not degrade the drug. The method was successfully applied to determine the encapsulation efficiency of apocynin in BSA nanoparticles.

关键词： Apocynin Nanoparticles Bovine serum albumin HPLC

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

Simulation of jet quenching observables in Heavy Ion Collisions at the LHC

Simulation of jet quenching observables in Heavy Ion Collisi...

引用

The 19th International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions

作者： Gabor veres University of Budapest BudapestHungary

＜正＞Measurements at the LHC will be the first ones where isolating and studying the properties of fully formed high energy jets in heavy-ion collisions will be possible. To estimate the feasibility and precision of jet energy and correlation measurements, a Monte-Carlo event generator is needed, which models hard collisions and parton energy loss in a heavy-ion environment, as well as general hydrodynamical features, multiplicity, azimuthal anisotropy, fluctuations of the underlying soft

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Immune phenotype in children with therapy-nave remitted and relapsed Crohn’s disease

引用

World Journal of Gastroenterology 2010年第47期16卷 6001-6009页

作者： Aron Cseh Barna Vasarhelyi Kriszta Molnar Balazs Szalay Peter Svec Andras Treszl Antal Dezsofi Peter Laszlo Lakatos Andras Arato Tivadar Tulassay Gabor veres Research Group for Pediatrics and Nephrology Semmelweis University Hungarian Academy of Sciences Department of Laboratory Medicine Semmelweis University First Department of Pediatrics Semmelweis University First Department of Medicine Semmelweis University

AIM: To characterize the prevalence of subpopulations of CD4+ cells along with that of major inhibitor or stimulator cell types in therapy-nave childhood Crohn's disease (CD) and to test whether abnormalities of immune phenotype are normalized with the improvement of clinical signs and symptoms of disease. METHODS: We enrolled 26 pediatric patients with CD. 14 therapy-nave CD children; of those, 10 children remitted on conventional therapy and formed the remission group. We also tested another group of 12 chil-dren who relapsed with conventional therapy and were given infliximab; and 15 healthy children who served as controls. The prevalence of Th1 and Th2, nave and memory, activated and regulatory T cells, along with the members of innate immunity such as natural killer (NK), NK-T, myeloid and plasmocytoid dendritic cells (DCs), monocytes and Toll-like receptor (TLR)-2 and TLR-4 expression were determined in peripheral blood samples. RESULTS: Children with therapy-nave CD and those in relapse showed a decrease in Th1 cell prevalence. Simultaneously, an increased prevalence of memory and activated lymphocytes along with that of DCs and monocytes was observed. In addition, the ratio of myeloid /plasmocytoid DCs and the prevalence of TLR-2 or TLR-4 positive DCs and monocytes were also higher in therapy-nave CD than in controls. The majority of alterations diminished in remitted CD irrespective of whether remission was obtained by conventional or biological therapy. CONCLUSION: The finding that immune phenotype is normalized in remission suggests a link between immune phenotype and disease activity in childhood CD. Our observations support the involvement of members of the adaptive and innate immune systems in childhood CD.

关键词： Crohn’s disease Dendritic cell Infliximab Lymphocyte Monocyte Regulatory T cell Relapse Remission Therapy-nave Toll-like receptor

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

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：