检索结果-南通市图书馆

Visual efficiency among teenaged athletes and non-athletes

International Journal of Ophthalmology(English edition) 2017年第9期10卷 1460-1464页

作者： rokiah omar Yau Meng Kuan Nurul Atikah Zuhairi Faudziah Abd Manan Victor Feizal Knight Optometry&Vision Science Program School of HealthcareSciencesFaculty of Health SciencesUniversity Kebangsaan MalaysiaJalan Raja Muda Abdul AzizKuala Lurnpur 50300Malaysia Department of Optometry&Vision Science Kulliyyah of Allied Health SciencesInternational Islamic University MalaysiaBandar Indera MahkotaKuantan 25200PahangMalaysia Faculty of Medicine and Defence Health National Defence University of MalaysiaSungai Besi CampKuala Lumpur 57000Malaysia

AIM：To compare visual efficiency,specifically accommodation,vergence,and oculomotor functions among athletes and ***：A cross-sectional study on sports vision screening was used to evaluate the visual skills of 214elementary students（107 athletes,107 non-athletes）,aged between 13 and *** visual screening assessed visual parameters such as ocular motor alignment,accommodation,and vergence ***：Mean visual parameters were compared between age-group matched athletes（mean age14.82±0.98y）and non-athletes（mean age 15.00±1.04y）.The refractive errors of all participants were corrected to maximal attainable best corrected visual acuity of log *** function assessment evaluated amplitude of accommodation and accommodation *** functions measured the near point of convergence,vergence facility,and distance fusional vergence at break and recovery *** motor alignment was not statistically significant between both *** had a statistically significant amplitude of accommodation for both the right eye（t=2.30,P=0.02）and the left eye（t=1.99,P=0.05）.Conversely,non-athletes had better accommodation facility（t=-2.54,P=0.01）and nearpoint of convergence（t=4.39,P〈0.001）when compared to *** facility was found to be better among athletes（t=2.47,P=0.01）.Nevertheless,non-athletes were significantly better for both distance negative and positive fusional ***：Although the findings are still inconclusive as to whether athletes had superior visual skills as compared to non-athletes,it remains important to identify and elucidate the key visual skills needed by athletes in order for them to achieve higher performance in their sports.

关键词： accommodation phoria vergence athletes non-athletes sports

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

孟加拉吉大港区学龄前儿童眼病发生率研究（英文）

引用

国际眼科杂志 2017年第1期17卷 16-20页

作者： Mezbah Uddin rokiah omar Victor Feizal Khurshid Alam 马来西亚吉隆坡马来西亚国民大学卫生科学院验光和视觉科学系 50300 孟加拉吉大港眼科医院和训练基地吉大港大学社区眼科学研究所

目的:研究吉大港区学龄前儿童的眼病发生率情况。方法:随机横断面抽样调查,研究孟加拉吉大港区学龄前儿童的眼病发生率。对60所托儿所4~6岁学龄前儿童进行记录,走访且检查眼睛。根据性别、年龄、视力障碍和眼部疾病的诱因,分析所获得的... 详细信息

目的:研究吉大港区学龄前儿童的眼病发生率情况。方法:随机横断面抽样调查,研究孟加拉吉大港区学龄前儿童的眼病发生率。对60所托儿所4~6岁学龄前儿童进行记录,走访且检查眼睛。根据性别、年龄、视力障碍和眼部疾病的诱因,分析所获得的数据。结果:对60所托儿所共计900例学龄前儿童进行检查,其中男性儿童占52.6%,女性儿童占47.4%。年龄范围为4~6岁不等。平均年龄为5.47±0.64。在学龄前儿童中,眼病发生率为16.89%,通常疾病为7.66%儿童存在屈光不正,其次3.66%患结膜炎,2.77%患睑缘炎,1.66%患鼻泪管阻塞(NDO),0.88%患感染性结膜炎,0.33%患麦粒肿,0.44%患睑板腺囊肿。其中1.11%患弱视,0.77%患斜视,0.11%患发育性白内障,0.33%患角膜混浊,是一个值得关注的问题。结论:研究学龄前儿童的眼病发生率可以很容易地确定可持续视力筛查方案,如果及时采取治疗能够有效降低眼部疾病的患病率和视力障碍。目前的研究表明,未对屈光不正进行矫正是学龄前儿童视力障碍的主要原因。

关键词：眼睛筛查眼睛疾病学龄前儿童屈光不正视力

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

On the stability of the flow over a shrinking cylinder with prescribed surface heat flux

引用

Propulsion and Power Research 2020年第2期9卷 181-187页

作者： Izyan Syazana Awaludin rokiah Ahmad Anuar Ishak Faculty of Management Multimedia University63100CyberjayaSelangorMalaysia Department of Mathematical Sciences Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600UKMBangiSelangorMalaysia

This study investigates the steady stagnation point flow and heat transfer passes a horizontal shrinking permeable *** free stream velocity and the prescribed surface heat flux arc assumed to vary linearly with the distance from a fixed point on the *** partial differential equations governing the flow and heat transfer are transformed into a system of ordinary differential equations via similarity *** equations are solved numerically for several values of the governing parameters,such as suction parameter s,curvature parameter γ,and shrinking parameter λ.The equations arc solved numerically by employing the boundary value problem solver package available in MATLAB software,*** effects of the governing parameters on the skin friction coefficient,surface temperature,velocity,and temperature profiles are *** the existence of dual solutions in the present study for a certain range of the curvature parameter,stability analysis is carried out to determine which one of the solutions is stable as time *** outcome of the stability analysis demonstrates that only the first solution,with lower boundary layer thickness,appeared to be stable and thus physically reliable,while the other is *** is also discovered that the boundary layer separation is delayed by reducing the curvature parameter.

关键词： Stagnation point flow Heat transfer Shrinking cylinder Prescribed surface heat Stability 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

Application of solvent evaporation technique for pure drug crystal spheres preparation

引用

Particuology 2022年第8期20卷 79-89页

作者： omar Mady Department of Pharmaceutical Technology Faculty of Pharmacy Tanta UniversityEgypt

An innovative application ofthe solventevaporation technique was *** tech nique is a technique for drug encapsulation and nanosphere *** widely used technique is also facing the problem of low actual drug entrapment percent,which is not economic from the industrial *** goal of this work is trying to use the advantage of this technique concerning the product sphericity and the ability to control particle size,to prepare a drug as pure crystals *** is selected as a model *** spheres are formed by using Polyvinyl pyrrolidone(PVP)or Polyethylene glycol(PEG)as an anti-aggregating agent but not formed on using tween or *** size and actual drug content depend on the concentrations the anti-aggregating agent *** of the drug crystal spheres are porous with empty sphere internal structure on using PvP but spongy and rough on using *** drug has its identity chemical form in the drug crystal *** scan of spheres prepared on using PEG showed a characteristic ether *** showed melting endothermic peak of PEG,but X-ray showed minor change in the drug crystal *** release profiles from crystal spheres prepared with the same anti-aggregating agent are close to each *** drug release profiles from drug crystal spheres prepared by using PEG are more controlled than that prepared by using *** drug release mechanism is *** was concluded that,the same technique could be suggested for preparation ofother biomedical material in pure crystals spheres with controlled particle *** properties may encourage to prepare very small particles with spherical shape for inhalation or injection as an innovative particle technology application for the widely used technique.

关键词： Solvent evaporation technique Drug crystal spheres Ibuprofen Polyvinyl pyrrolidone Polyethylene glycol

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

Monolayer MoS_(2)/n-Si Heterostructure Schottky Solar Cell

引用

Journal of Renewable Materials 2022年第7期10卷 1979-1988页

作者： omar Salih omar The University of Duhok College of ScienceDepartment of PhysicsDuhokKurdistan RegionIraq

Monolayer MoS_(2)has a promising optoelectronics property,with a bandgap in the visible range;the material is a potential candidate for solar cell *** this work,we grew MoS_(2)monolayers using a low-pressure chemical vapor deposition *** produce uniform wafer-scale MoS_(2)monolayer films,precursors molybdenum dioxide(MoO_(2))and sulfur(S)are *** force microscopy was used to quantify the thickness of the monolayers,and the result was validated by Raman *** electron microscopy(TEM)was used to confirm the crystalline quality of the monolayers,and photoluminescence spectroscopy was used to evaluate their optical *** were able to create a Schottky solar cell with a MoS_(2)monolayer up to 1 cm2 area by transferring monolayer film to n-type *** MoS_(2)/n-Si Schottky solar cell demonstrated photovoltaic characteristics with a short circuit current density of 14.8 mA cm^(-2)and an open-circuit voltage of 0.32 V under 100 mW cm^(-2)*** fill factor and energy conversion efficiency were 53%and 2.46%,respectively,with the highest external quantum efficiency at 530 nm being 44%.

关键词： MoS_(2)monolayers chemical vapor deposition Schottky solar cell

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

Awareness of eye complications and prevalence of retinopathy in the first visit to eye clinic among type 2 diabetic patients

引用

International Journal of Ophthalmology(English edition) 2011年第5期4卷 519-524页

作者： I Tajunisah PS Wong LT Tan P rokiah SC Reddy Department of Ophthalmology Faculty of MedicineUniversity of Malaya Final Year Medical Students Faculty of MedicineUniversity of Malaya Department of Medicine(Endocrinology unit) Faculty of MedicineUniversity of Malaya Department of Ophthalmology UCSI School of MedicineTerengganu campus

AIM:To assess the awareness of eye complications and the prevalence of retinopathy,in the first visit to eye clinic,among type 2 diabetic patients attending a tertiary medical centre in Kuala Lumpur,***:An investigator-administered questionnaire was given to 137 patients with diabetes undergoing first time eye screening in the eye *** was followed by a detailed fundus examination by a senior ophthalmologist to assess for presence of ***:Almost 86% of respondents were aware of diabetic eye complications,especially in patients who had achieved tertiary educational level(96.3%).The majority of the patients(78.8%) were referred by their physicians and only 20.4% came on their own *** of the patients(43.8%) did not know how frequent they should go for an eye check-up and 72.3% did not know what treatments were *** of understanding on diabetic eye diseases(68.6%) was the main barrier for most patients for not coming for eye screening *** a high level of awareness,only 21.9% had recorded HbA1c level of <6.5% while 31.4% were under the erroneous assumption of having a good blood sugar control.A total of 29.2% had diabetic retinopathy in their first visit eye ***:In the present study,29.2% of type 2 diabetic patients had retinopathy in their first time eye *** the awareness of diabetic eye complications was high among first time eye screening patients,the appropriate eye care-seeking behavior was comparatively less and should be rectified to prevent the rise of this sight threatening eye disease.

关键词： diabetic retinopathy eye complications awa-reness eye screening

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

VISCOMETRIC INVESTIGATIONS OF POLYVINYLPYRROLIDONE IN MIXED SOLVENTS AND WITH VARYING TEMPERATURE

引用

Chinese Journal of Polymer Science 2005年第4期23卷 367-371页

作者： omar Melad omar Abu-Tiem Rajai Baraka Chemistry Department

The viscosity behavior of polyvinylpyrrolidone(PVP)has been determined at 25℃ in mixed solvents comprising water/dimethylformamide(DMF)and water/methanol(MeOH).Analysis of the data has considered the PVP as being both host and guest polymer in *** intrinsic viscosity of PVP in DMF is higher than in water and in MeOH,but also increases in a mixed solvent with high water content because of the effect of polymer-solvent *** was also found that the intrinsic viscosity of PVP at finite concentration,[η_(pvp)]_c decreases with an increase in the concentration of PVP in *** viscosity behavior of PVP in a mixed solvent is affected by the concentration-dependent intermolecular excluded volume effect,which can be quantitatively expressed by the parameter,b_Y,which reflects the shrinkage of PVP chain coils,resulting in a decrease of[η_(pvp)]_*** effect of temperature on the viscosity behavior of PVP in MeOH shows that the interaction parameter increases up to a maximum value,and then decreases after a certain temperature.

关键词： Polyvinylpyrrolidone Intermolecular excluded volume effect Intrinsic viscosity

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

Reintegrating nanogranitoid inclusion composition to reconstruct the prograde history of melt-depleted rocks

引用

Geoscience Frontiers 2019年第2期10卷 517-525页

作者： omar Bartoli Department of Geosciences University of Padova

A recent fascinating development in the study of high-grade metamorphic basements is represented by the finding of tiny inclusions of crystallized melt(nanogranitoid inclusions) hosted in peritectic phases of migmatites and granulites. These inclusions have the potential to provide the primary composition of crustal melts at the source. A novel use of the recently-published nanogranitoid compositional database is presented here. Using granulites from the world-renowned Ivrea Zone(NW Italy) on which the original melt-reintegration approach has been previously applied, it is shown that reintegrating melt inclusion compositions from the published database into residual rock compositions can be a further useful method to reconstruct a plausible prograde history of melt-depleted rocks. This reconstruction is fundamental to investigate the tectonothermal history of geological terranes.

关键词： Nanogranitoids Melt-reintegration Granulite High-temperature metamorphism

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

Power Reallocation and Complexity Enhancement for Beyond 4G Systems

引用

China Communications 2019年第6期16卷 114-128页

作者： omar Daoud Communications and Electronics Engineering Department Philadelphia University

Competitiveness in the modern wireless systems’provided services is a key factor in the development,in addition to the adaptation to/harmonization of user ***,this paper discussed the quality of services from the point of view of the need for supporting the needed data *** this purpose,a benchmark based on Multi-Antenna Multiband Orthogonal Frequency Division Multiplexing has been proposed to compatible with Ultra-Wideband systems such as the fifth generation based *** order to enhance the system quality of service,the structure of the ultra-wideband system’s main stage;namely Orthogonal Frequency Division Multiplexing has been modified by imposing a low complexity designed Haar-wavelets stage instead of the fast Fourier transform *** is in addition to reallocate the transmitted power in order to reduce the effect of one of the main drawbacks that is found in the Orthogonal Frequency Division Multiplexing;namely the peak-to-average power ratio problem.A MATLAB simulation has been performed in order to validate the propositions that have been made based on six different performance *** a result,the new propositions were achieved our targets by reducing the system’s complexity in terms of mathematical operations and by giving promising results in managing the transmitted ***,the effectiveness of such work has been verified and compared with four different work in the literature。

关键词： multi antennas-multiband wireless PAPR Haar-DWT power reallocation ACLR EVM

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

Enhance Vertical Handover Security During Execution Phase in Mobile Networks

引用

Computers, Materials & Continua 2022年第8期72卷 3863-3875页

作者： omar Khattab Department of Computer Science and Engineering Kuwait College of Science and Technology(KCST)Kuwait

The Vertical Handover(VHO)is one of the most vital features provided for the heterogeneous mobile *** allows Mobile Users(MUs)to keep ongoing sessions without disruption while they continuously move between different Radio Access Technologies(RATs)such as Wireless Fidelity(Wi-Fi),Global System for Mobile Communication(GSM),Universal Mobile Telecommunications System(UMTS),Long Term Evolution(LTE)and Fifth Generation(5G).In order to fulfill this goal,the VHO must comply to three main phases:starting of collecting the required information and then passing it for decision phase to obtain the best available RAT for performing VHO by execution phase ***,the execution phase still encounters some security issues which are exploited by hackers in launching malicious attacks such as ransomware,fragmentation,header manipulation,smurf,host initialization,reconnaissance,eavesdropping,Denial of Service(DoS),spoofing,Man in the Middle(MITM)and *** paper thoroughly studies the recent security issues for hundreds VHO approaches found in the literature and comes up with a secure procedure to enhance VHO security during execution phase.A numerical analysis results of the proposed procedure are effectively evaluated in terms of security and signaling *** with the recent related work found in literature,the analysis demonstrates that the security is successfully improved by 20%whereas signaling cost is maintained as in non-proposed procedure.

关键词： Vertical handover security mobile networks wireless networks heterogeneous wireless networks

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：