检索结果-南通市图书馆

Ocular higher-order aberrations and mesopic pupil size in individuals screened for refractive surgery

International Journal of Ophthalmology(English edition) 2012年第2期5卷 222-225页

作者： Seyed Javad Hashemian mohammad Soleimani Alireza Foroutan Mahmood Joshaghani mohammad Jafar Ghaempanah mohammad Ebrahim jafari Mehdi Yaseri Eye Research center Rasoul Akram Hospital Tehran University of Medical Sciences Tehran Iran Department of Epidemiology and Biostatistics School of Public Health Tehran University of Medical Sciences Tehran Iran

AIM: To study the distribution of ocular higher-order aberrations(HOAs) and mesopic pupil size in individuals screened for refractive surgery. · METHODS: Ocular HOAs and mesopic pupil size were studied in 2 458 eyes of 1 240 patients with myopia, myopic astigmatism and compound myopic astigmatism and 215 eyes of 110 patients with hyperopia, hyperopic astigmatism and compound hyperopic astigmatism using the Zywave aberrometer (Busch& Lomb). All patients had correctable refractive errors without a history of refractive surgery or underlying diseases. Root-mean-square values of HOAs, total spherical aberration, total coma and mesopic pupil size were analyzed. Ocular HOAs were measured across a ≥ 6.0 mm pupil, and pupil size measurements were performed under the mesopic condition. · RESULTS: The mean values of HOAs, total spherical aberration and total coma in the myopic group were 0.369 μm, ±0.233, 0.133±0.112μm and 0.330±0.188μm, respectively. In the hyperopic group the mean values of HOAs, total spherical aberration and total coma were 0.418μm±0.214, 0.202±0.209μm and 0.343±0.201μm, respectively. Hyperopes showed greater total HOAs (P <0.01) and total spherical aberration (P <0.01) compared to myopes. In age-matched analysis, only the amount of total spherical aberration was higher in the hyperopic group (P =0.05). Mesopic pupil size in the myopic group was larger (P ≤0.05). · CONCLUSION: The results suggested that significant levels of HOAs were found in both groups which are important for planning refractive surgeries on Iranians. There were significantly higher levels of total spherical aberration in hyperopes compared to myopes. Mesopic pupil size was larger in myopic group.

关键词： corneal wavefront aberration pupil mesopic vision race myopia hyperopia

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

Network analysis of Iranian’s health insurance ecosystem before and after the introduction of Universal Health Insurance law

引用

Global Health Research and Policy 2023年第1期8卷 379-391页

作者： Rohaneh Rahimisadegh Somayeh Noori Hekmat mohammad Hossein Mehrolhassani mohammad jafari Sirizi Health Services Management Research Center Institute for Futures Studies in HealthKerman University of Medical SciencesKermanIran Health Foresight and Innovation Research Center Institute for Futures Studies in HealthKerman University of Medical SciencesKermanIran Department of Health Management Policy and EconomicsFaculty of Management and Medical Information SciencesKerman University of Medical SciencesKermanIran National Center for Health Insurance Research TehranIran

Introduction The policy-making process in health reform is challenging due to the complexity of organizations,overlapping roles,and diversity of *** present study aims to investigate and analyze the network of actors in the Iran health insurance ecosystem regarding the laws before and after the adoption of the Universal Health Insurance(UHI).Methods The present study was done by sequential exploratory mixed method research,consisting of two distinct *** the qualitative phase,the actors and issues pertaining to the laws of the Iranian health insurance ecosystem from 1971 to 2021 were identified through a systematic search of the laws and regulations section of the Research Center of the Islamic Legislative Assembly *** data was analyzed in three steps using directed content *** the quantitative phase,in order to draw the communication network of the actors in Iran’s health insurance ecosystem,the data related to the nodes and links of the networks was *** communication networks were drawn using Gephi software and the micro-and macro-indicators of network were calculated and *** There were 245 laws and 510 articles identified in the field of health insurance in Iran from 1971 to *** of the legal comments were on financial matters and credit allocation,and the payment of *** number of actors before and after the enactment of the UHI Law was 33 and 137,*** Ministry of Health and Medical Education and the Iran Health Insurance Organization were found the two main actors in the network before and after the approval of this *** Adopting a UHI Law and delegating various legal missions and tasks,often with support to the health insurance organization,have facilitated the achievement of the law ***,it has created a poor governance system and a network of actors with low *** on the results of the study,it is suggested to reduce actor

关键词： Health insurance Ecosystem Actors Network analysis Universal health insurance law Iran

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

Improving the Cellular Characteristics of Aluminum Foam for Maximum Sound Absorption Coefficient Using Genetic Algorithm

引用

Sound & Vibration 2021年第2期55卷 117-130页

作者： mohammad Javad jafari Mohsen Niknam Sharak Ali Khavanin Touraj Ebadzadeh Mahmood Fazlali Rohollah Fallah Madvari Department of Occupational Health Engineering School of Public Health and SafetyShahid Beheshti University of Medical SciencesTehranIran Mechanical Engineering Department of Mechanical EngineeringUniversity of BirjandBirjandIran Department of Occupational Health Engineering Faculty of Medical SciencesTarbiat Modares UniversityTehranIran Department of Ceramics Materials and Energy Research CenterAlborzIran Department of Data and Computer Science Faculty of Mathematical SciencesShahid Beheshti UniversityTehranIran Student Research Committee Department of Occupational Health EngineeringSchool of Public Health and SafetyShahid Beheshti University of Medical SciencesTehranIran Department of Occupational Health School of Public HealthShahid Sadoughi University of Medical SciencesYazdIran

Fabricating of metal foams with desired morphological parameters including pore size,porosity and pore opening is possible now using sintering ***,if it is possible to determine the morphology of metal foam to absorb sound at a given frequency,and then fabricate it through sintering,it is expected to have optimized metal foams for the best sound *** sound absorption models such as Lu model describe the relationship between morphological parameters and the sound absorption *** this study,the Lu model was used to optimize the morphological parameters of aluminum metal foam for the best sound absorption *** this purpose,the Lu model was numerically solved using written codes in MATLAB *** validating the proposed codes with benchmark data,the genetic algorithm(GA)was applied to optimize the affecting morphological parameters on the sound absorption *** optimization was carried out for the thicknesses of 5 mm to 40 mm at the sound frequency range of 250 Hz–8000 *** optimized parameters ranged from 50%to 95%for porosity,0.1 mm to 4.5 mm for pore size,and 0.07 mm to 0.6 mm for pore opening *** result of this study was applied to fabricate the desired aluminum metal foams for the best sound *** novel approach applied in this study,is expected to be successfully applied in for best sound absorption in desired frequencies.

关键词： Acoustic model Genetic Algorithm(GA) metal foam optimization Sound Absorption Coefficient(SAC)

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

Rumi: An Intelligent Agent Enhancing Learning Management Systems Using Machine Learning Techniques

引用

Journal of Software Engineering and Applications 2022年第9期15卷 325-343页

作者： Behafarid mohammad jafari Mengyuan Zhao Ali jafari Department of Electrical and Computer Engineering Indiana University-Purdue University Indianapolis Indianapolis USA Department of Instructional System Technology School of Education Indiana University Bloomington USA Department of Computer and Information Technology Indiana University-Purdue University Indianapolis Indianapolis USA

The dramatic improvement of information and communication technology (ICT) has made an evolution in learning management systems (LMS). The rapid growth in LMSs has caused users to demand more advanced, automated, and intelligent services. This paper discusses how Artificial Intelligence and Machine Learning techniques are adopted to fulfill users’ needs in a social learning management system named “CourseNetworking”. The paper explains how machine learning contributed to developing an intelligent agent called “Rumi” as a personal assistant in CourseNetworking platform to add personalization, gamification, and more dynamics to the system. This paper aims to introduce machine learning to traditional learning platforms and guide the developers working in LMS field to benefit from advanced technologies in learning platforms by offering customized services.

关键词： Learning Management Systems Intelligent Agents Artificial Intelligence Machine Learning

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 complications of propofol,sevoflurane,and dexmedetomidine anesthesia for fiberoptic bronchoscopy in children aged 1 month to 3 years:a randomized trial

引用

南方医科大学学报 2024年第9期44卷 1631-1636页

作者： Amir Shafa mohammad Montasery Sedighe Shahhosseini Majid Keivanfar Asieh Maghami Mehr Mahtab Ebrahim Babaei mohammad jafari Department of Anesthesiology Anesthesiology and Critical Care Research Center Department of Pediatrics Isfahan University of Medical SciencesIsfahanIran Department of Statistics Yazd UniversityYazdIran Departments of Obstetrics and Gynecology Shahrekord University of Medical SciencesShahrekordIran

Objective To evaluate the effect of propofol,sevoflurane,and dexmedetomidine on respiratory complications inchildren undergoing fiberoptic bronchoscopy(FOB).Methods This double-blind randomized clinical trial was conductedamong 120 children aged 1 month to 3 years undergoing *** patients were randomized into 3 groups(n=40)foranesthesia induction with sevoflurane inhalation,1 mg/kg propofol,or 1μg/kg dexmedetomidine before bronchoscopy,andthe changes in hemodynamic parameters,sedation level,and respiratory complications during and after the procedure *** The patients'heart rate during bronchoscopy was significantly lower and the mean arterial blood pressuresignificantly higher in dexmedetomidine group than in sevoflurane and propofol groups(P<0.05).Cough duringbronchoscopy did not occur in any of the cases in propofol group,while the highest frequency of cough was recorded indexmedetomidine *** incidence of laryngospasm in the propofol group(12.5%)was significantly lower than those insevoflurane and dexmedetomidine groups(30%and 32.5%,respectively)(P<0.05).Conclusion Sevoflurane and propofol aresafe and suitable for anesthesia induction in children below 3 years of age undergoing diagnostic FOB and can achieve bettersedative effect and lower the incidences of cough and respiratory complications as compared with dexmedetomidine.

关键词： fiberoptic bronchoscopy propofol sevoflurane dexmedetomidine children

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

屈光手术前个体眼高阶像差与中间视觉状态下瞳孔大小(英文)

引用

国际眼科杂志 2012年第7期12卷 1226-1230页

作者： Seyed Javad Hashemian mohammad Soleimani Alireza Foroutan Mahmood Joshaghani mohammad Jafar Ghaempanah mohammad Ebrahim jafari Mehdi Yaseri 德黑兰医疗科学大学附属Rasoul Akram医院眼科中心伊朗德黑兰德黑兰医疗科学大学公共卫生学院流行病与卫生统计学系伊朗德黑兰

目的:研究眼高阶像差的分布(HOAs)和mesopic瞳孔的大小在个体中筛选的屈光手术。方法:我们采用Zywave像差分析仪(博士伦)分别对患有近视、近视散光和复性近视散光患者1240例2458眼和患有远视、远视散光和复性远视散光患者110例215眼的... 详细信息

目的:研究眼高阶像差的分布(HOAs)和mesopic瞳孔的大小在个体中筛选的屈光手术。方法:我们采用Zywave像差分析仪(博士伦)分别对患有近视、近视散光和复性近视散光患者1240例2458眼和患有远视、远视散光和复性远视散光患者110例215眼的高阶像差和瞳孔大小进行检测。所有患者屈光不正均可矫正,无屈光手术史或潜在疾病。HOAs的均方根值、总球面像差、总斜射球面像差和中间视觉状态下瞳孔的大小进行了分析,眼高阶像差测量均在瞳孔≥6.0mm,且瞳孔大小的测量均为在中间视觉状态下进行。结果:HOAs均方根值、总球面像差和总斜射球面像差在近视眼组与远视眼组分别为0.369±0.233μm、0.133±0.112μm、0.330±0.188μm;0.418±0.214μm、0.202±0.209μm、0.343±0.201μm。与近视患者相比,远视患者的总HOAs和总球面像差更大(P均<0.01)。年龄匹配分析显示在远视眼组只有总球面像差较高(P=0.05)。近视眼组的中间视觉状态下瞳孔大小较大(P≤0.05)。结论:实验结果表明两组的HOAs的水平有显著差异,这对于将行屈光手术的伊朗人很重要。远视眼组的总球面像差显著高于近视眼组,中间视觉状态下瞳孔大小在近视眼组较大。

关键词：角膜波前像差瞳孔中间视觉种族近视,远视

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

应用波前像差引导的LASEK治疗近视散光和低、高度近视(英文)

引用

国际眼科杂志 2015年第2期15卷 192-197页

作者： Seyed Javad Hashemian Abbas Sheikh-Hassani Alireza Foroutan Mohammd Jafar Ghempanah mohammad Ebrahim jafari Mahsa Sadat Hashemian Shadrokh Nabili 伊朗医科大学 Rassoul Akram医院眼科研究中心伊朗德黑兰*** 伊朗医科大学药学院伊朗德黑兰*** Morecambe Bay NHS信托会大学医院英国兰开斯特肯德尔LA1 4RP

目的：对比在矫正低度近视,近视散光和高度近视时应用波前像差引导的激光上皮瓣下角膜磨镶术（LASEK）的安全性,有效性,可预测性,稳定性和并发症。方法：该回顾性分析共纳入416眼,分为3组,低度近视组159眼,等值球镜-3.68±1.33D;近视散... 详细信息

目的：对比在矫正低度近视,近视散光和高度近视时应用波前像差引导的激光上皮瓣下角膜磨镶术（LASEK）的安全性,有效性,可预测性,稳定性和并发症。方法：该回顾性分析共纳入416眼,分为3组,低度近视组159眼,等值球镜-3.68±1.33D;近视散光组161眼,等值球镜-5.99±2.24D,柱镜度2.41±1.07D;高度近视组96眼,等值球镜-7.41±0.80D.制瓣后,进行波前像差为基础的准分子激光削切术。在术后10d,2,6和12mo后评估其安全性,有效性,可预测性和稳定性。结果：术后12mo,低度近视组等值球镜-0.36±0.31D,近视散光组0.15±0.41D,高度近视组0.58±0.68D。低度近视组中,裸眼视力为20/20的患者占90.60%,近视散光组78.90%,高度近视组67%。疗效指标在三组中分别为0.98,1.04和0.92.安全性指标分别为1.00,1.07和1.05。低度近视组有5眼（3.1%）最佳矫正视力提升1行,近视散光组有44眼（27.3%）提升1~3行,高度近视组18眼（19.2%）提升1~2行。低度近视组只有2例产生角膜雾状混浊。在疗效和安全性方面三组比较均无统计学差异。结论：波前像差引导的激光上皮瓣下角膜磨镶术是治疗低度近视,近视散光和高度近视的一种有效安全的方法,而在治疗近视散光时其可预测性、有效性和安全性更佳。

关键词：波前像差引导激光上皮瓣下角膜磨镶术近视散光激光视力矫正

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

定量分析非开挖法与明挖法的利与弊

引用

非开挖技术 2018年第1期 1-5页

作者： mohammad Reza jafari William J 周正

近年来，明挖法已成为世界上最主要的地下工程施工方法。但是，其施工中的复杂性与专业设备的高额成本限制了其在大口径交通工程中的施工效率。相比传统明挖法，近年来出现的水平定向钻进、微型隧道掘进等非开挖技术有其经济上的优势。... 详细信息

近年来，明挖法已成为世界上最主要的地下工程施工方法。但是，其施工中的复杂性与专业设备的高额成本限制了其在大口径交通工程中的施工效率。相比传统明挖法，近年来出现的水平定向钻进、微型隧道掘进等非开挖技术有其经济上的优势。通常认为，明挖法的风险要小于非开挖法。明挖法易于适应意外的地下工况，路旁施工的经验，但这也造成了其与公共交通道路的冲突，形成了“拉链马路”现象。然而，非开挖法需要进行额外的地下勘探和岩土工程监测，来规避各种风险，如公用设施与构筑物的沉降、土壤渗漏、弃土回流线堵塞、未预料到的地下条件和避免不可通行的障碍物等状况。这篇文章主要比较了微型隧道掘进与传统明挖法在不同深度F48、60in管路施工中的经济效益。经济效益主要参考了岩土数据报告成本，交通管理成本，延期成本，地表恢复成本，岩土工程监测成本，微隧道工程的局限性，安装和支持开挖的长期影响，全年天气独立性，进度监测，施工容忍度及政府观念等。以锡康克河一工程为例。

关键词：非开挖明挖法工程预算对比

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

Study of the effects of natural toothbrush (<i>Salva-dora persica</i>) in prevention of dental caries and plaque index

引用

Health 2012年第9期4卷 612-618页

作者： Fatemeh Ezoddini-Ardakani Mahmoud Nouri Shadkam Hasan Fotouhi Farah Bolouri Kashani Mahin Abbassi Zahra Hashemian Hossein Dehghani mohammad Ali Jaffari Hossein Barzegar Faezeh Nazarinejhad mohammad Kazem jafari Abas Heydaripour mohammad Javad Dashti Atefesadat Hedayati Masoud Masoumi Somaye Ebrahimi Faculty of Dentistry Shahid Sadoughi University of Medical Sciences Yazd Iran Faculty of Medicine Shahid Sadoughi University of Medical Sciences Yazd Iran Shahid Sadoughi University of Medical Sciences Yazd Iran

Background: Nowadays, though more attention is being paid to oral and dental hygiene all over the world, dental caries and periodontal diseases are increasing daily. We decided to study the effectiveness of natural toothbrush in prevention of dental caries and plaque formation. Methods: This analytic, semi-experimental clinical trial included 390 individuals. Subjects were divided into 3 groups: using natural toothbrush, using artificial toothbrush and using both natural and artificial toothbrush. The plaque index and DMFT was assessed at the beginning of the study until 1 year. ANOVA, Kruskal Wallis, LSD, Paired t-test, chi square, Fisher exact and Mc-Nemar tests were used for data analysis. Results: The plaque index in all three groups showed a mean reduction of 0.71. The mean DMFT in the samples before intervention was 8.38 ± 4.14 and increased to 9.1 ± 4.56. At the end of the study, the lowest plaque index was observed in the group using both the natural and artificial methods. During one year follow-up, the plaque index decreased 1.16, 0.83, and 0.21 degrees in the first, second and third groups. Conclusion: The increase in DMFT in the group that used artificial toothbrush was more than other groups. Thus, use of natural toothbrush leads to a decrease in growth rate of DMFT. Therefore natural toothbrush can be used for the cleaning of teeth and prevention of dental caries.

关键词： Salvadora persica Natural Toothbrush Toothbrush and Tooth Paste Caries Plaque Index

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

Enhanced degradation of reactive dyes using a novel carbon ceramic electrode based on copper nanoparticles and multiwall carbon nanotubes

引用

Chinese Journal of Chemical Engineering 2020年第1期28卷 318-327页

作者： Fatemeh jafari Navid Nasirizadeh mohammad Mirjalili Department of Textile and Polymer Engineering Yazd BranchIslamic Azad UniversityYazdIran

A novel carbon ceramic electrode consisting of Cu NPs and MWCNT was developed to treat reactive orange 84(RO84) wastewater using ultrasound-assisted electrochemical degradation. The proposed electrode generated more hydroxyl radicals than non-nanoparticle electrodes did. In addition, a new electrochemical sensor was applied to determine residue RO84 in an aqueous medium during discoloration. This sensor is based on a glassy carbon electrode modified with gold nanourchins and graphene oxide and can detect RO84 concentration in the range of 1.0–1200 μmol·L^-1 with the detection limit of 0.03 μmol·L^-1. The degradation effects of the modified electrode on RO84 were evaluated systematically with different initial pH values, time durations, and amounts of Cu NPs and MWCNT. The results suggested that the removal efficiency of RO84 was approximately 83% after120 min of electrolysis in a phosphate buffer with pH 8.0 using a carbon ceramic electrode made with 4.0 wt%Cu NPs and 4.0 wt% MWCNT. The possible mechanism of RO84 degradation was monitored by gas chromatography–mass spectrometry, and degradation pathways were proposed.

关键词： Electrochemical degradation Carbon ceramic nanocomposite Reactive dye Copper nanoparticles

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：