检索结果-南通市图书馆

Novel experimental techniques to assess the time-dependent deformations of geosynthetics under soil confinement

Journal of Rock Mechanics and Geotechnical Engineering 2021年第2期13卷 410-419页

作者： carina maia lins costa Jorge Gabriel Zornberg Department of Civil Engineering Federal University of Rio Grande do NorteAv.Senador Salgado Filho 3000NatalRio Grande do Norte59078-970Brazil Department of Civil Architectural and Environmental Engineering The University of Texas at Austin301 E.Dean KeetonAustinTX78712-0280USA

A new experimental approach to assess the impact of soil confinement on the long-term behavior of geosynthetics is presented in this *** experimental technique described herein includes a novel laboratory apparatus and the use of different types of tests that allow generation of experimental data suitable for evaluation of the time-dependent behavior of geosynthetics under soil *** soil-geosynthetic interaction equipment involves a rigid box capable of accommodating a cubic soil mass under plane strain conditions.A geosynthetic specimen placed horizontally at the mid-height of the soil mass is subjected to sustained vertical pressures that,in turn,induce reinforcement axial loads applied from the soil to the *** previously reported studies on geosynthetic behavior under soil confinement,the equipment was found to be particularly *** minor setup modifications,not only interaction tests but also in-isolation geosynthetic stress relaxation tests and soil-only tests under a constant strain rate can be conducted using the same ***,the time histories of the reinforcement loads and corresponding strains are generated throughout the *** from typical tests conducted using sand and a polypropylene woven geotextile are presented to illustrate the proposed experimental *** testing procedure was found to provide adequate measurements during tests,including good repeatability of test *** soilegeosynthetic interaction tests were found to lead to increasing geotextile strains with time and decreasing reinforcement tension with *** test results highlighted the importance of measuring not only the time history of displacements but also that of reinforcement loads during *** approach of using different types of tests to analyze the soilegeosynthetic interaction behavior is an innovation that provides relevant insight into the impact of soil confinement on the time-dependent deformations of geos

关键词： Geosynthetics Geotextile Creep Stress relaxation Reinforced soil Long-term deformation

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

Immediate and late effects of chronic stress in the testes of prepubertal and adult rats

引用

Asian Journal of Andrology 2018年第4期20卷 385-390页

作者： carina T Ribeiro Diogo B De Souza Waldemar S costa Francisco J B Sampaio Marco A Pereira-Sampaio Urogenital Research Unit State University of Rio de Janeiro Rio de Janeiro RJ 20551-030 Brazil Department of Morphology Fluminense Federal University Niteroi RJ 24210-150 Brazil

The objective of this study was to investigate the effects of chronic stress on the testes of prepubertal and adult rats and to evaluate whether any alterations could be reversed when stress induction is ended. Seventy-six male rats were assigned to eight groups depending on the type of treatment （control or stressed）, the age at which stress was initiated （prepubertal or adult）, and the time of evaluation （immediate or late）. Stress stimuli were applied for 6 weeks. Stressed prepubertal and adult rats evaluated immediately after the last stress stimulus were included in SP-I and SA-I groups, respectively. The late prepubertal （SP-L） and adult （SA-L） groups of stressed rats were evaluated 6 weeks after the last stress stimulus. Age-matched rats were used as controls （CP-I, CA-I, CP-L, and CA-L groups）. Application of stress stimuli to rats in the SP-I group resulted in body weight and seminiferous tubule diameter reduction. The rats in the SA-I group also showed several functional （testosterone level and sperm parameter） and morphological （testicular weight and seminiferous tubule diameter） reductions. The rats in the SP-L group showed increased body weight and intertubular compartment volumetric and absolute densities and reduced tubular compartment volumetric density. The rats in the SA-L group presented only reduced sperm viability. Stress stimuli promoted changes in the rats in all the study groups. The testes of the adult rats were the most affected by chronic stress. However, the stressed adult rats recovered well from the testicular alterations.

关键词： chronic stress morphometry rat testis

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

Updating semen analysis:a subpopulation approach

引用

Asian Journal of Andrology 2020年第1期22卷 118-119页

作者： Almudena Garcia-Molina Anthony Valverde Daznia Bompart carina Caldeira Alberto Vendrell Carles Soler Proiser R+D S.L. Scientific ParkUniversitat de ValenciaPaterna 46980ValenciaSpain Department of Functional Biology and Physical Anthropology University of ValenciaBurjassot 46100ValenciaSpain Technological Institute of costa Rica San Carlos CampusSchool of AgronomyAlajuela 223-21001Costa Rica

Dear Editor,Reproductive problems affect 8%-12%of human populations worldwide;40%-50%of all infertility cases are due to the male,and up to 2%of men have suboptimal sperm quality.

关键词： dating cases infertility

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

Investigation of the Grain Growth Evolution in the AISI 304H Austenitic Stainless Steel

引用

Journal of Mechanics Engineering and Automation 2016年第2期6卷 95-99页

作者： Rodrigo Pinto de Siqueira Jose Flavio Silveira Feiteirat Dionisio Jos6 Rodrigues da costa and Jefferson Fabricio Cardoso lins Department of Mechanical Engineering Fluminense Federal University Volta Redonda 27255-125 Brazil

The austenitic stainless steels usually present an excellent combination of corrosion resistance and mechanical properties such as ductility in the annealed condition and high yield strength after cold deformation. Solution annealing in the AISI 304H is recommended before deformation process in order to improve ductility. However, long annealing during solution annealing can cause GG （grain growth） or AGG （abnormal grain growth） in the AISI 304H. In these cases, ductility is strongly decreased. Therefore, GG or AGG must be avoided during solution annealing. In this article, grain growth during solution annealing of the AISI 304H samples was determined. Samples of the AISI 304H were annealed at 1,100 ℃ for solution-annealing times varying from 15 min to 180 min. The results show that AGG took place for samples annealed at 1,100 ℃ for 30 min. In this condition, grain size reached 70 ± 10 μm. After annealing solution at 1,100 ℃ for 180 min, grain size reached 120 ~ 20 μm. In summary, the results shown that solution annealing at 1,100 ℃ even for relatively short annealing promotes the prompt increase of the grain size.

关键词： AISI 304H austenitic stainless steel solution annealing grain growth abnormal grain growth.

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

Loop-Mediated Isothermal Amplification (LAMP) for the Detection of <i>Listeria monocytogenes</i>and Major Pathogenic Serotypes

引用

American Journal of Analytical Chemistry 2014年第16期5卷 1057-1064页

作者： Ana Paula Rocha da costa Mariana de Lira Nunes carina Lucena Mendes-Marques Alzira Maria Paiva de Almeida Nilma Cintra Leal Departamento de Microbiologia Centro de Pesquisas Aggeu Magalh&atilde es FIOCRUZ-PE Recife Brazil

Rapid identification and characterization of Listeria monocytogenes are required for the food industry, epidemiological studies, and disease prevention and control. However, typing procedures are labor-intensive and time-consuming, and they require technical expertise, a panel of sera and reference culture strains or sophisticated and expensive equipment. To improve upon traditional diagnostic methods for L. monocytogenes we developed and evaluated an efficient procedure for the specific identification of L. monocytogenes and the major pathogenic serotypes of the species based on loop-mediated isothermal amplification (LAMP). Four individual reactions were designed using primers targeting any L. monocytogenes serotypes (LAMP-AS) and the 1/2a (LAMP-1/2a), 1/2b (LAMP-1/2b), and 4b (LAMP-4b) serotypes. The procedure distinguished L. monocytogenes from closely genetically related species and the targeted serotypes. Cross-reactivity with a few rare serotypes isolated from food or clinical samples did not impair the usefulness of the procedure. Thus, our approach constitutes a fast, easy and low-cost alternative for L. monocytogenes diagnosis and serotyping and may be useful for surveillance and epidemiological investigation programs.

关键词： Listeria monocytogenes Diagnosis Serotypes Identification LAMP

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

Analysis of the Progressive Collapse of Buildings underHigh Temperatures Using Successive ApproximationTechnique

引用

Journal of Civil Engineering and Architecture 2020年第1期14卷 46-60页

作者： Luciano lins Vieira Luciano Mendes Bezerra Ramon Saleno Yure Rubim costa Silva Welington Vital da Silva Emanuella Guntzel Barbosa Valdeir Francisco de Paula Department of Civil Engineering University of BrasíliaBrasíliaDF-70910-900Brazil Department of Civil Engineering CEUBBrasíliaDF-70790-075Brazil Federal Institute of Education Science and Technology of GoiásGoianiaGO-74055-110Brazil

This paper presents an investigation of the disproportionate collapse of multi-store steel buildings in a natural fire situation due to the progressive failure of their *** this purpose,it is intended to evaluate the effects of the redistribution of stress and vertical displacements of columns with the evolution of the temperature addressing,also,the impacts of the localized faults of these structural *** addition,another objective of this paper is the development of a practical analysis approach,which is called by successive *** a methodology,advanced computational techniques were developed to predict the structural behavior of the building as the temperature reduces the strength and stiffness of its structural *** the parametric study,the overall response of the building was investigated through fire simulations in many *** results showed that the phenomenon of redistribution of stresses that occur during the heating period is essentially due to the reduction in the modulus of elasticity of the *** addition,the study pointed out that the use of advanced computational techniques through the use of successive approximations technique is an excellent alternative to study the progressive collapse of buildings subject to high temperatures.

关键词： Progressive collapse fire column.

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

What we have learned from urinary bladder cancer models

引用

Journal of Cancer Metastasis and Treatment 2016年第1期2卷 51-58页

作者： carina Bernardo Céu costa Carlos Palmeira Rosário Pinto-Leite Paula Oliveira Rui Freitas Francisco Amado Lúcio L.Santos Experimental Pathology and Therapeutics Group-Research Center Portuguese Oncology Institute-Porto(IPO-Porto)Rua Dr.António Bernardino de Almeida4200-072 PortoPortugal Mass Spectrometry Group QOPNADepartment of ChemistryUniversity of AveiroCampus Universitário de Santiago3810-193 AveiroPortugal Department of Immunology Portuguese Oncology Institute-Porto(IPO-Porto)Rua Dr.António Bernardino de Almeida4200-072 PortoPortugal School of Health Sciences Fernando Pessoa University4249-004 PortoPortugal Genetic Service Cytogenetic LaboratoryHospital Center of Trás-os-Montes e Alto Douro5000-508 Vila RealPortugal Department of Veterinary Sciences CITABUniversity of Trás-os-Montes e Alto Douro5001-801 Vila RealPortugal Department of Urology Portuguese Oncology Institute-Porto(IPO-Porto)Rua Dr.António Bernardino de Almeida4200-072 PortoPortugal Department of Surgical Oncology Portuguese Oncology Institute-Porto(IPO-Porto)Rua Dr.António Bernardino de Almeida4200-072 PortoPortugal

Urinary bladder cancer(UBC)is a heterogeneous disease with highly variable clinical outcomes and responses to *** some advances in the molecular understanding of UBC,this knowledge still has not been translated to the clinic in terms of improvements in the prognosis and treatment of *** urinary bladder tumor models representative of the human disease in terms of histology and behavior are needed to study factors involved in tumor initiation,progression and ***,accurate model systems would facilitate identification of new therapeutic targets and predictive markers that could lead to optimization of existing therapies and development of new *** established cancer cell lines derived from human urinary bladder tumors representing different grades and stages have been used as experimental models for UBC *** cell lines reflect some of the genetic and morphologic alterations observed in human urothelial carcinoma and serve as simplified models to study the behavior of cancer cells in ***,their translational potential is limited due to the artificial conditions,in which the cells are maintained,grown and *** models offer a more complex and realistic model for the establishment,development,and progression of tumors as well as to evaluate new therapeutic *** the years,the authors'group has worked with several UBC cell lines,established and characterized chemically induced UBC models,and patient-derived xenografts *** this study,the authors will provide a summary of the UBC models developed by their group,analyze their translational potential and weaknesses,and define areas that remain to be explored.

关键词： Animal models cell lines tumor behavior urothelial bladder cancer xenografts

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

Effect of Blends Gasoline with Oxygenated Additives in the Performance of Internal Combustion Engine

引用

Journal of Power and Energy Engineering 2021年第7期9卷 1-9页

作者： Suzara Rayanne de Castro Sena André Luis Oliveira de Almeida Leonara Luizza da costa Leite Jean Gustavo de Melo Araujo Eduardo lins de Barros Neto Camila Gambini Pereira Centre of Education and Research in Oil and Gas Federal University of Rio Grande do Norte (UFRN) Natal Brazil

The objective of this study was to evaluate the effect of blends of different oxygenated additives on gasoline in SI engine Otto cycle. The formulations analyzed were: pure gasoline (type A), common gasoline (type C), gasoline type A + 15% (v/v) oxygenated additives (ethanol, ethyl octanoate, ethyl oleate). The experiments were performed using engine Branco 4-stroke and 2-cylinder, electric dynamometer, exhaust system, control unit composed of Multi-K unit, variable selector and load cell, stroboscope tachometer, fuel supply system and stopwatch. The rotation was conserved at 4400 rpm and wheel power varied from 3 kW to 12 kW, with intervals of 3 kW to obtain hourly consumption curves and brake specific fuel consumption. Even esters and ethanol having lower heat of combustion, hourly consumption was similar to pure gasoline (type A). In relation to the brake specific fuel consumption, increasing the wheel power had a better conversion of the mass of fuel burned into energy. Thus, this study showed that the mixture of gasoline and esters (ethyl octanoate and ethyl oleate) presented good efficiency in terms of consumption. This research contributes to the needs and to the current studies in which industries started to add renewable products to petroleum-derived fuels;in order to obtain more sustainable fuels at lower costs.

关键词： Gasoline Oxygenated Additives Consumption

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

Antimicrobial Activity of a Formulation of <i>Libidibia ferrea</i>L. against Microorganisms of the Dental Biofilm

引用

Advances in Microbiology 2020年第9期10卷 434-442页

作者： Raquel de Oliveira Marreiro Maria Fulgência costa Lima Bandeira carina Toda Fábio Correia Sampaio Tatiane Pereira de Souza Gisely Naura Venâncio Wanderleia Monteiro de Souza Nikeila Chacon de Oliveira Conde School of Dentistry Federal University of Amazonas Manaus AM Brazil Federal University of Paraíba Health Sciences Center Department of Clinical and Social Dentistry Jo&atilde o Pessoa PB Brazil Faculty of Pharmaceutical Sciences Federal University of Amazonas Manaus AM Brazil Manaus Municipal Health Department SEMSA Manaus AM Brazil

This study aimed to evaluate the antimicrobial activity of the extract of Libidibia ferrea L. (228.022-INPA) and a mouthwash formulation against microorganisms of the dental biofilm. The extract of Libidibia ferrea L. was prepared and formulated with an alcohol-free mouthwash. The Minimum Inhibitory Concentration—MIC was determined by microdilution and cell viability was evaluated through fluorescence. The MICs for the extract were 4.375 μg/mL (Streptococcus mutans), 3.750 μg/mL (Streptococcus oralis), 4.375 μg/mL (Lactobacillus casei). In contrast, for the mouthwash, the MICs were 6.000 μg/mL (bacteriostatic against Streptococcus mutans and bactericidal against Streptococcus oralis). In 1.250 μg/mL of the extract, the number of viable cells measured by fluorescence tests was 16.47% and 14.12% for Streptococcus mutans and Lactobacillus casei, respectively. For the mouthwash (1.000 μg/mL), 20.60% of viable cells for Streptococcus mutans, and 9.60% for Lactobacillus casei were observed. It can be concluded that the extract and its mouthwash containig Libidibia ferrea L. showed antibacterial activity against microorganisms from the dental biofilm.

关键词： Mouthwash Juca Natural Products

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

Respiratory Muscle Strength Evaluation in Healthy Adult and Elderly Women—Respiratory Muscle Strength Assessment in Adult and Elderly

引用

Health 2018年第8期10卷 1031-1036页

作者： Maria Clara de Souza Pereira Gama Maciel Cássio Daniel Araújo da Silva Fernanda Figueiroa Sanchez Jamilly Reboucas Demosthenes Marques Pablo costa Cortez Camila Miriam Suemi Sato Barros do Amaral Naylla Morais de Souza Roberta lins Goncalves Federal University of Amazonas-UFAM ManausBrazil

Measurement of respiratory muscle strength is performed through static measurements of maximal respiratory pressures and is an important tool for determining the existence and prognosis of neuromuscular and pulmonary disorders, such as weakness or fatigue of this musculature. Objectives: To evaluate and compare respiratory muscle strength among healthy adult and elderly women. Methods: A total of 163 healthy women were recruited through convenience sampling at the family centers of the city of Manaus (AM, Brazil), divided into two groups: adult women (age 20 - 59 years) and elderly women (over 60 years of age). The evaluation was performed by Manovacuometry, in order to measure the maximum inspiratory pressure (MIP) and maximum expiratory pressure (MEP). For statistical analysis we used the Student’s T test, considering significant p value ≤ 0.05. Results: The final sample consisted of 116 adult women and 47 elderly women. The mean age in the group of women between 20 - 59 years was 44.5 ± 12 and the elderly group was 65 ± 6.6. MIP values in adult women were significantly higher when compared to the elderly (−108 ± 5.3 cmH2O × −79.5 ± 4 cmH2O, p = 0.0014, respectively). The same behavior was observed in the evaluation of MEP (87.1 ± 2.9 cmH2O in adults and 69.8 ± 3.5 cmH2O in the elderly;p = 0.0008). Conclusion: The results indicate that inspiratory and expiratory muscle strength is lower in older women, suggesting that the aging process tends to interfere with those muscles, resulting in altered respiratory system function.

关键词： Muscular Strength Evaluation Respiratory Muscles Aging

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：