检索结果-南通市图书馆

Asymptomatic dengue infection in adults of major cities of Pakistan

Asian Pacific Journal of Tropical Medicine 2017年第10期10卷 1002-1006页

作者： Ibrar Rafique Muhammad Arif Nadeem Saqib Muhammad Arif Munir Huma Qureshi Ijaz-ul-Haq Taseer rizwan Iqbal Waqaruddin Ahmed Tasleem Akhtar rizwanullah Pakistan Health Research Council Head OfficeIslamabadPakistan Pakistan Health Research Council Research CentreNishtar Medical CollegeMultanPakistan Pakistan Health Research Council Research CentreKing Edward Medical UniversityLahorePakistan Pakistan Health Research Council Research CentreJinnah Postgraduate Medical CentreKarachiPakistan Pakistan Health Research Council Research CentreKhyber Medical CollegePeshawarPakistan

Objective: To determine the asymptomatic dengue infection in adults of Pakistani ***: This study was conducted in five major cities(Islamabad, Karachi, Lahore,Multan, and Peshawar) of Pakistan.A total of 5 230 adults aged 18 years and above without a history of dengue fever at any point in their life were enrolled from participating *** who were confirmed for dengue previously were *** the total, 62.6%(n = 3 276) were male with an average age of 34.6 *** were briefed about the objectives of the study, and written consent was obtained to perform dengue Ig G test using enzyme linked immunosorbent *** brief information related to age, gender and area was also taken on ***: Overall 32.3%(n = 1 691) was having asymptomatic dengue infection which was 67.5%(n = 756) in Karachi followed by 39.1%(n = 391) in Islamabad, 29.9%(n =316) in Lahore and 21%(n = 228) in Peshawar and none from *** males were affected with asymptomatic dengue infection than *** asymptomatic dengue infection was significantly higher in different cities; however, there was no significant difference with respect to age ***: The asymptomatic dengue infection is higher in cities ***,Islamabad and Lahore which are at risk of developing secondary dengue *** is a need of awareness among the public about secondary dengue infection.

关键词： Dengue Exposure Secondary dengue infection Asymptomatic

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

Can We Predict Abdominal Aortic Aneurysm (AAA) Progression and Rupture by Non-Invasive Imaging?—A Systematic Review

引用

International Journal of Clinical Medicine 2011年第4期2卷 484-499页

作者： Abeera Abbas rizwan Attia Alberto Smith Matthew Waltham 不详

Introduction: The most commonly used predictor of aneurysm behavior in clinical decision-making is size. There are however small aneurysms that rupture and certain large aneurysms remain asymptomatic. There is growing evidence to suggest that other variables may provide better information on metabolic and physiological properties of aortic wall and therefore better predict aneurysm behavior. Methods: The literature was systematically reviewed from 1975-May 2011 to examine the evidence to support the use of non-invasive imaging modalities that might predict aneurysm behavior. Results: Ultrasound can be used to measure multiple dynamic aortic properties (i.e. distensibility and compliance) in addition to diameter. These parameters better predict aneurysm behavior. Computer tomography can utilize assessment of aortic calcification, presence of intra-luminal thrombus and distensibility. Finite element analysis model has been validated in-vivo to calculate peak wall stress, assess effects of intra-luminal thrombus and calcification. It however relies on assumptions related to aneurysm properties and therefore remains relatively inaccurate in the clinical setting. Small numbers of observational human studies have evaluated the role of 18F-FDG PET/CT in aneurysms. Larger studies are needed, as 18F-FDG uptake is patchy and heterogeneous even in small number of patients. It varies in the same patient with time, as aneurysms grow in intermittently. We discuss functional magnetic resonance imaging with novel tracers such as 99 mTc-annexin-V and nanoparticles. Conclusion: Multimodality imaging with complementary methods such as CT, functional MRI (fMRI), ultrasound and physiological measurements improve the definition of aneurysm pathobiology. Larger-scale clinical validation is beginning to promise a new paradigm in cardiovascular diagnostics.

关键词： Abdominal Aortic Aneurysm (AAA) Progression and Rupture Non-invasive Imaging

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

Enhancing Security in Multicellular Multicast Channels Reducing Interference Power with the Best Relay Selection

引用

Journal of Computer and Communications 2022年第1期10卷 1-26页

作者： Shaikh Muhammad rizwan Ali Md. Zahurul Islam Sarkar Department of Information and Communication Technology BUP Dhaka Bangladesh Department of Electrical and Electronic Engineering RUET Rajshahi Bangladesh

The capacity of wireless networks is fundamentally limited by interference. A few research has focused on the study of the simultaneous effect of interference and correlation, and less attention has been paid to the topic of canceling simultaneous effect of interference and correlation until recently. This paper considers a secure wireless multicasting scenario through multicellular networks over spatially correlated Nakagami-m fading channel in the presence of multiple eavesdroppers. Authors are interested to protect the desired signals from eavesdropping considering the impact of perfect channel estimation (PCE) with interference and correlation. The protection of eavesdropping is also made strong reducing the simultaneous impact of interference and correlation on the secrecy multicast capacity employing opportunistic relaying technique. In terms of the signal-to-interference plus noise ratio (SINR), fading parameter, correlation coefficient, the number of multicast users and eavesdroppers and the number of antennas at the multicast users and eavesdroppers, the closed-form analytical expressions are derived for the probability of non-zero secrecy multicast capacity and the secure outage probability for multicasting to understand the insight of the effects of aforementioned parameters. The results show that the simultaneous effects of correlation and interference at the multicast users degrade security in multicasting. Moreover, the security in multicasting degrades with the intensity of fading and the number of multicast users, eavesdroppers and antennas at the eavesdroppers. The effects of these parameters on the security in multicasting can be significantly reduced by using opportunistic relaying technique with PCE. Finally, the analytical results are verified via Monte-Carlo simulation to justify the validity of derived closed-form analytical expressions.

关键词： Correlation Interference Power Multicellular Multicast Channel Nakagami-m Fading Opportunistic Relaying Probability of Non-Zero Secrecy Multicast Capacity Secure Outage Probability for Multicasting

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

Generalized Inverted Kumaraswamy Distribution: Properties and Application

引用

Open Journal of Statistics 2017年第4期7卷 645-662页

作者： Zafar Iqbal Muhammad maqsood Tahir Naureen Riaz Syed Azeem Ali Munir Ahmad Department of Statistics Government College Gujranwala Pakistan Garrison University Lahore Pakistan Department of Statistics Government College Lahore Pakistan National College of Business Administration and Economics Lahore Pakistan

The techniques to find appropriate new models for data sets are very popular nowadays among the researchers of this area where existed models in the literature are not suitable. In this paper, a new distribution, generalized inverted Kumaraswamy (GIKum) distribution is introduced. The main aims of this research are to develop a general form of inverted Kumaraswamy (IKum) distribution which is flexible than the IKum distribution and all of its related and sub models. Some properties of GIKum distribution such as measures of central tendency and dispersion, models of stress-strength, limiting distributions, characterization of GIKum distribution and related probability distributions through some specific transformations are derived. The mathematical expressions of reliability function (r.f) and the hazard rate function (hrf) of the GIKum distribution are found and presented through their graphs. The parameters estimation through the maximum likelihood (ML) estimation method is used and the results are applied to the data set of prices of wooden toys of 31 children.

关键词： Generalized Inverted Kumaraswamy Distribution Stress-Strength Models Maximum Likelihood Estimation

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

Antenatal Sonographic Diagnosis of A Case of Alobar Holoprosencephaly: A Case Report

引用

International Journal of Clinical Medicine 2012年第5期3卷 431-432页

作者： rizwan Ahmad Khan Manjari Thapa Shagufta Wahab Deptt. of Radiodiagnosis JNMCH Aligarh India Deptt. of Radiodiagnosis JNMCH AMUAligarh India Division of Pediatric Sugery Deptt of Surgery JNMCH AMUAligarh

Holoprosencephaly is a rare congenital brain malformation resulting from failure of diverticulation and cleavage of primitive prosencephalon which occurs at 4 - 8th week of gestation and is usually associated with multiple midline facial anomalies. Herein we report an antenatal case of such patient. Patient was evaluated and because of the magnitude of the problem induction was done which led to a still born baby.

关键词： Holoprosencephaly Alobar Antenatal Detection Developing Countries Prognosis

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

视频点播中用户行为分析

视频点播中用户行为分析

引用

作者： M. rizwan ARIF 中国科学技术大学

学位级别：硕士

视频点播(VoD)服务已经成为在线娱乐产业的一个重要部分。然而,在实现VOD服务上仍然有许多挑战,尤其是带宽、存储和数据传输已经成为影响在供应商向客户提供VOD服务的主要问题。本工作的目的在于通过对用户点播行为的研究,帮助服务商了... 详细信息

视频点播(VoD)服务已经成为在线娱乐产业的一个重要部分。然而,在实现VOD服务上仍然有许多挑战,尤其是带宽、存储和数据传输已经成为影响在供应商向客户提供VOD服务的主要问题。本工作的目的在于通过对用户点播行为的研究,帮助服务商了解用户需求,从而设置更加合适的服务策略和服务模式,以将数据高效传输给用户,提高用户的满意度。本文采用了中国电信在江苏省开展IPTV商业运行的实际用户行为数据,并着重研究了与点播时长、到达率、离开率和系统并发率有关的工作负载特性。本文主要工作有：1.建立SQL数据库,并将从江苏电信获得的运行数据在数据库中进行复原,并编写SQL程序进行分析。2.研究了用户点播时长的分布,针对电影和电视剧的结果稍有不同,电影类的用户观看时长大多是短时间的(1-5分钟内);电视剧类的会话时长多为一个正常电视剧集长度(40-50分钟)。总体来说,用户行为态度是急躁的。3.研究了用户到达率和离开率,两者是相似的,均有明显的规律性：从0点到6点,用户到达/离开率逐步下降到最低值;6点到11点,到达/离开率会慢慢提升到平均值;11点到14点到达/离开率会再次提升到更高值;14点到18点间又降低;然后开始上升,20点到23点半是全天的最高值,随后开始下降。4.最后研究了系统并发率。在以小时为考察单位考察每天的系统并发情况时,由模型可以看出早晨、午休和傍晚时用户访问量增加。更多的用户访问发生在晚上8点,在2个小时后达到峰值,之后在第二天早上3点多开始减到最低值。而将上述考察周期改为一周作为观察窗口,则一周中,周末的系统并发量最高。通过上述研究可以发现,VOD服务的用户行为具有一定的模式,后继可以对系统通过上述模型,进一步研究其服务策略的设置,从而提高系统的服务质量。

关键词： VOD系统单播系统多播系统宽带管理

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Week Ahead Electricity Power and Price Forecasting Using Improved DenseNet-121 Method

引用

Computers, Materials & Continua 2022年第9期72卷 4249-4265页

作者： Muhammad Irfan Ali Raza Faisal Althobiani Nasir Ayub Muhammad Idrees Zain Ali Kashif rizwan Abdullah Saeed Alwadie Saleh Mohammed Ghonaim Hesham Abdushkour Saifur Rahman Omar Alshorman Samar Alqhtani Electrical Engineering Department College of EngineeringNajran University Saudi ArabiaNajran61441Saudi Arabia Department of Computer Science COMSATS University IslamabadWah Campus22060Pakistan Faculty of Maritime Studies King Abdulaziz UniversityJeddah21589Saudi Arabia Department of Computer Science Federal Urdu University of ArtsScience and TechnologyIslamabad44000Pakistan School of Electrical Engineering and Computer Science National University of Science and TechnologyIslamabad44000Pakistan Department of Computer Science and Engineering University of Engineering and TechnologyNarowal CampusLahore54000Pakistan Department of Electrical Engineering HITEC UniversityTaxila47080Pakistan College of Computer Science and Information Systems Najran UniversityNajran61441Saudi Arabia

In the Smart Grid(SG)residential environment,consumers change their power consumption routine according to the price and incentives announced by the utility,which causes the prices to deviate from the initial ***,electricity demand and price forecasting play a significant role and can help in terms of reliability and *** to the massive amount of data,big data analytics for forecasting becomes a hot topic in the SG *** this paper,the changing and non-linearity of consumer consumption pattern complex data is taken as *** minimize the computational cost and complexity of the data,the average of the feature engineering approaches includes:Recursive Feature Eliminator(RFE),Extreme Gradient Boosting(XGboost),Random Forest(RF),and are upgraded to extract the most relevant and significant *** this end,we have proposed the DensetNet-121 network and Support Vector Machine(SVM)ensemble with Aquila Optimizer(AO)to ensure adaptability and handle the complexity of data in the ***,the AO method helps to tune the parameters of DensNet(121 layers)and SVM,which achieves less training loss,computational time,minimized overfitting problems and more training/test *** evaluation metrics and statistical analysis validate the proposed model results are better than the benchmark *** proposed method has achieved a minimal value of the Mean Average Percentage Error(MAPE)rate i.e.,8%by DenseNet-AO and 6%by SVM-AO and the maximum accurateness rate of 92%and 95%,respectively.

关键词： Smart grid deep neural networks consumer demand big data analytics load forecasting price forecasting

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 functional,physical,mechanical and thermal properties of TiO2 embedded polyester hybrid composites:A design of experiment(DoE)study

引用

Progress in Natural Science:Materials International 2018年第3期28卷 266-274页

作者： Muhammad Azeem Munawar Dirk Wolfram Schubert Shahzad maqsood Khan Muhammad Atiq Ur Rehman Nafisa Gulld Atif Islam Aneela Sabir Muhammad Shafiq Bilal Haider Mudassar Azam Saba Urooge Khan Monika M.Voigt Institute of Polymer Materials Friedrich-Alexander-University Department of Polymer Engineering and Technology University of the Punjab Bavarian Polymer Institute Institute of Biomaterials Friedrich-Alexander-University Institute of Chemical Engineering and Technology University of the Punjab

This paper presents a study on the Design of Experiments(Do E) approach to optimize the fabrication parameters of titania(TiO2) embedded glass fiber reinforced polyester hybrid composites(HCs). HCs of unsaturated polyester resin(UPR) were fabricated using methyl ethyl ketone peroxide(MEKP) as the curing agent by hand lay-up process(HLUP) and compression molding technique(CMT). The fabrication parameters were optimized by Taguchi Do E(an orthogonal array of L25) using 3 control factors(concentration of TiO2, concentration of MEKP and curing temperature) having 5 levels each. Statistical tools were employed to identify significant factors affecting tensile strengths and its reproducibility during HLUP. It was found that the concentration of TiO2in HCs significantly influenced the tensile strength(TS) followed by MEKP concentration and curing temperature. The highest value of TS was obtained at 3 wt% TiO2, 2 wt% MEKP and 80 °C. Nevertheless, the sensitivity of TiO2concentration was basis for fabrication of polyester titania glass fiber hybrids(PTGFHs), which were further investigated for density and void fractions, linear shrinkage, flexural strength, impact strength, hardness and thermal behaviors. Moreover, cross-linking and hydrogen-bonding between polymeric chains, styrene, silica content of glass fiber and TiO2particles in PTGFHs were confirmed by Fourier transform infrared spectroscopy.

关键词： Hybrid composites Polyester Design of experiment Titania

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Light-triggered plasmonic vesicles with enhanced catalytic activity of glucose oxidase for programmable photothermal/starvation therapy

引用

Science China Materials 2021年第5期64卷 1291-1301页

作者： Zhuoting Deng Yaling He Muhammad rizwan Younis Shan Lei Chao Jiang Yanyan Yuan Peng Huang Jing Lin Marshall Laboratory of Biomedical Engineering International Cancer CenterLaboratory of Evolutionary Theranostics(LET)School of Biomedical EngineeringShenzhen University Health Science CenterShenzhen 518060China

Glucose oxidase(GOx)-based nanotheranostic agents hold great promise in tumor starvation and its synergistic therapy. Self-assembled plasmonic gold vesicles(GVs) with unique optical properties, large hollow cavity, and strong localized surface plasmon resonance, can be used as multi-functional nanocarriers for synergistic therapy. Herein,GOx-loaded GVs(GV-GOx) were developed for light-triggered GOx release as well as enhanced catalytic activity of GOx, achieving programmable photothermal/starvation therapy. Under near-infrared laser irradiation, the GV-GOx generated strong localized hyperthermia due to plasmon coupling effect of GVs, promoting the release of encapsulated GOx and increasing its catalytic activity, resulting in enhanced tumor starvation effect. In addition, the high photothermal effect improved the cellular uptake of GV-GOx and allowed an efficient monitoring of synergistic tumor treatment via photoacoustic/photothermal duplex imaging in vivo. Impressively, the synergistic photothermal/starvation therapy demonstrated complete tumor eradication in 4 T1 tumorbearing mice, verifying superior synergistic anti-tumor therapeutic effects than monotherapy with no apparent systemic side effects. Our work demonstrated the development of a light-triggered nanoplatform for cancer synergistic therapy.

关键词： light-triggered release plasmonic vesicles glucose oxidase photothermal therapy starvation therapy

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

Numerical Simulation of Char Particle Gasification

引用

Journal of Energy and Power Engineering 2015年第8期9卷 679-686页

作者： Syed Shabbar Raza Isam Janajreh rizwan Ahmed Ashjan AlKatheeri Waste to Energy Lab Masdar Institute of Science and Technology Abu Dhabi 54224 UAE Takreer Research Center Abu Dhabi 3593 UAE

A first principal modeling of the gasification of a char particle is performed using single step mechanism. The char particle is considered to be spherical in shape and only the physical and chemical properties can change in the radial direction. The carbon dioxide is used as the gasification agent that reacts with the char and form carbon monoxide. The presence of both solid and gaseous phase species makes the reaction heterogeneous. The char particle is considered with varying porosity that also allows the change in the surface area of the particle. A time invariant temperature and pressure profile is used at which the Arrhenius rate constant and diffusion is calculated. The mass conservation of model results in the form of two coupled partial differential and one ordinary differential equation. The equations are solved with a set of initial and boundary conditions using the bulk species concentration at the particle surface. A second order accurate central differencing scheme is used to discretize space while backward differencing is used to discretize time. Finally, the results are presented for the concentration distribution of CO and CO2 in radial direction with respect to time. It shows that, maximum concentration of CO is present at the center of the particle while the concentration gradient becomes higher near the particle surface. The nonlinear concentration trend due to the diffusion is effectively captured. The results show that, completed conversion of char depend upon the time provided for the reaction which can be reduced by decreasing the size of particle or increasing the reaction temperature. The sensitivity study of temperature and initial porosity also performed and showed that temperature has high impact on char conversion as compare to initial porosity.

关键词： Coal particle conversion biomass porosity CO2 gasification.

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：