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Recent advances in the synthesis and energetic properties of potassium-based potential green primary explosives

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Defence Technology（防务技术） 2022年第11期18卷 1945-1959页

作者： Qamar-un-Nisa Tariq Saira Manzoor maher-un-Nisa Tariq Wen-Li Cao Jian-Guo Zhang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China Department of Chemistry University of OkaraOkara56300Pakistan

Primary explosives are utilized as a reliable initiator for secondary explosives in an extensive range of military and civilian operations. Heavy-metal-based primary explosives are moderate performing, more sensitive, and environmentally hazardous, posing a direct and indirect threat to health and ***, heavy-metal-based primaries have been replaced by environment-friendly metal-based primary explosives, such as potassium complexes. This review presents not only a summary of the current progress of new-generation potassium-based primary explosives and their methods of preparation, energetic properties, and applications, but also a further comparison with traditional primary explosives. In addition, this work discusses the necessity of heavy metal-free primary explosives and the major challenges faced in replacing traditional primary explosives.

关键词： Green primary explosives Heterocyclic compounds Synthesis Energetic properties

Modeling and forecasting of COVID-19 using a hybrid dynamic model based on SEIRD with ARIMA corrections

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Infectious Disease Modelling 2021年第1期6卷 98-111页

作者： maher Ala’raj Munir Majdalawieh Nishara Nizamuddin Department of Information Systems College of Technological InnovationZayed UniversityDubai19282United Arab Emirates

The outbreak of novel coronavirus(COVID-19)attracted worldwide *** has posed a significant challenge for the global economies,especially the healthcare *** with a robust healthcare system,countries were not prepared for the ramifications of *** statistical,dynamic,and mathematical models of the COVID-19 outbreak including the SEIR model have been developed to analyze the infection its transmission *** objective of this research is to use public data to study the properties associated with the COVID-19 pandemic to develop a dynamic hybrid model based on SEIRD and ascertainment rate with automatically selected *** proposed model consists of two parts:the modified SEIRD dynamic model and ARIMA *** fit SEIRD model parameters against historical values of infected,recovered and deceased population divided by ascertainment rate,which,in turn,is also a parameter of the *** of the first model for infected,recovered,and deceased populations are then corrected using ARIMA *** model can analyze the input data in real-time and provide long-and short-term forecasts with confidence *** model was tested and validated on the US COVID statistics dataset from the COVID Tracking *** validation,we use unseen recent statistical *** use five common measures to estimate model prediction ability:MAE,MSE,MLSE,Normalized MAE,and Normalized *** proved a great model ability to make accurate predictions of infected,recovered,and deceased *** output of the model can be used by the government,private sectors,and policymakers to reduce health and economic risks significantly improved consumer credit scoring.

关键词： COVID 19 Coronavirus SEIRD model ARIMA Hybrid model

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射频感应等离子体反应沉积碳化钨

中国有色金属学报 2003年第2期13卷 289-293页

作者：蒋显亮 maher Boulos 中南大学材料科学与工程学院长沙410083 Department of Chemical Engineering University of Sherbrooke Sherbrooke

用射频感应等离子体将钨粉炭化成碳化钨,对炭化过后的粉末在氩气保护下,于1900℃进行烧结处理,并对在感应等离子体中钨粉被甲烷炭化的反应过程和在高温基体上碳与沉积物进一步反应的机理进行了研究。采用扫描电镜和X射线衍射仪分析了原... 详细信息

用射频感应等离子体将钨粉炭化成碳化钨,对炭化过后的粉末在氩气保护下,于1900℃进行烧结处理,并对在感应等离子体中钨粉被甲烷炭化的反应过程和在高温基体上碳与沉积物进一步反应的机理进行了研究。采用扫描电镜和X射线衍射仪分析了原始钨粉、炭化粉末和反应沉积物的显微组织和成分。结果表明,快速炭化反应开始于金属钨粉熔化后,颗粒尺寸为5μm的钨粉在等离子体中被部分炭化,完全炭化要靠反应沉积物在高温基体上与碳的进一步反应来实现,经炭化的钨粉在热处理时存在脱碳现象。

关键词：射频感应等离子体沉积碳化钨钨粉炭化甲烷热处理脱碳

Imaging evaluation of periprosthetic loosening:A primer for the general radiologist

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World Journal of Radiology 2025年第2期17卷 1-10页

作者： Sahil S Shet Eid Kakish Stephen Christopher Murphy Ryan Roopnarinesingh Stephen P Power Michael M maher David J Ryan Department of Radiology School of MedicineUniversity College CorkCork T12 AK54Ireland Department of Trauma and Orthopaedic Surgery Cork University HospitalCork T12 DC4AIreland Department of Radiology Cork University HospitalCork T12 DC4AIreland

In response to an ageing global population,the primary hip and knee arthroplasty rate continues to *** an effective treatment,up to 25%patients may require revision arthroplasty during their lifetime,commonly due to periprosthetic *** procedures are associated with significantly increased healthcare costs;therefore,timely and accurate diagnostics are critical for clinicians and ***,which may be septic or aseptic,remains a challenge and requires thorough clinical examination and multimodal imaging *** radiographs remain an essential diagnostic tool but advanced imaging modalities such as computed tomography,magnetic resonance imaging and nuclear medicine are playing an increasingly important *** comprehensive review,through outlining the available radiological modalities,their respective strengths and weaknesses and the pertinent imaging findings,may help radiologists and orthopaedic surgeons make more informed decisions in the management of periprosthetic loosening.

关键词： Periprosthetic loosening Total hip replacement Total knee replacement Diagnostic radiology Aseptic loosening

Mesenchymal stem cell-based TRAIL delivery inhibits the metastatic state of clinical therapy-resistant progressive neuroblastoma

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World Journal of Pediatrics 2024年第3期20卷 287-293页

作者： Dinesh Babu Somasundaram Andrew maher Sheeja Aravindan Zhongxin Yu Brian MBesch Natarajan Aravindan Department of Radiation Oncology University of Oklahoma Health Sciences CenterOklahoma CityOKUSA Stephenson Cancer Center Oklahoma CityOKUSA Department of Pathology University of Oklahoma Health Sciences CenterOklahoma CityOKUSA Radiation Biology Laboratory University of Oklahoma Health Sciences CenterBSEB 302F941 Stanton L.Young BoulevardOklahoma CityOK 73104USA

Progressive neuroblastomas(pNBs)that defy current intensive multimodal clinical therapy(IMCT)are a significant contributor to overall childhood cancer deaths[l].Neuroblastomas(NBs)that survive first-line IMCT actively evolve to acquire genetic and molecular rearrangements and display unparalleled plasticity and evolution,which causes frequent relapses in a rapidly accelerating timeline[2-4].

关键词： neuroblastoma clinical evolve

A Comprehensive Review on Charging Topologies and Power Electronic Converter Solutions for Electric Vehicles

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 675-694页

作者： Abdelfatah Ali Hossam H.H.Mousa Mostafa F.Shaaban maher A.Azzouz Ahmed S.A.Awad the Department of Electrical Engineering American University of Sharjah26666 SharjahUnited Arab Emirates the Department of Electrical Engineering South Valley University83523 QenaEgypt the Department of Electrical and Computer Engineering University of WindsorWindsorON N9B 3P4 Canada Electrical Engineering Department Qatar UniversityDoha 2713Qatar Department of Electrical and Computer Engineering Sultan Qaboos UniversityMuscat123Oman

Electric vehicles(EVs)are becoming more popular worldwide due to environmental concerns,fuel security,and price *** performance of EVs relies on the energy stored in their batteries,which can be charged using either AC(slow)or DC(fast)***,EVs can also be used as mobile power storage devices using vehicle-to-grid(V2G)*** electronic converters(PECs)have a constructive role in EV applications,both in charging EVs and in ***,this paper comprehensively investigates the state of the art of EV charging topologies and PEC solutions for EV *** examines PECs from the point of view of their classifications,configurations,control approaches,and future research prospects and their impacts on power *** can be classified into various topologies:DC-DC converters,AC-DC converters,DC-AC converters,and AC-AC *** address the limitations of traditional DC-DC converters such as switching losses,size,and high-electromagnetic interference(EMI),resonant converters and multiport converters are being used in high-voltage EV ***,power-train converters have been modified for high-efficiency and reliability in EV *** paper offers an overview of charging topologies,PECs,challenges with solutions,and future trends in the field of the EV charging station applications.

关键词： Charging station charging topology electric vehicle power electronic converter vehicle-to-grid

An Improved Deep Structure for Accurately Brain Tumor Recognition

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Computer Systems Science & Engineering 2023年第8期46卷 1597-1616页

作者： Mohamed maher Ata Reem N.Yousef Faten Khalid Karim Doaa Sami Khafaga Department of Communications and Electronics Engineering MISR Higher Institute for Engineering and TechnologyMansoura35516Egypt Department of Electronics and Communications Delta Higher Institute for Engineering and TechnologyMansoura35516Egypt Department of Computer Sciences College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia

Brain neoplasms are recognized with a biopsy,which is not commonly done before decisive brain *** using Convolutional Neural Networks(CNNs)and textural features,the process of diagnosing brain tumors by radiologists would be a noninvasive *** paper proposes a features fusion model that can distinguish between no tumor and brain tumor types via a novel deep learning *** proposed model extracts Gray Level Co-occurrence Matrix(GLCM)textural features from MRI brain tumor ***,a deep neural network(DNN)model has been proposed to select the most salient features from the ***,it manipulates the extraction of the additional high levels of salient features from a proposed CNN ***,a fusion process has been utilized between these two types of features to form the input layer of additional proposed DNN model which is responsible for the recognition *** common datasets have been applied and tested,Br35H and FigShare *** first dataset contains binary labels,while the second one splits the brain tumor into four classes;glioma,meningioma,pituitary,and no ***,several performance metrics have been evaluated from both datasets,including,accuracy,sensitivity,specificity,F-score,and training *** results show that the proposed methodology has achieved superior performance compared with the current state of art *** proposed system has achieved about 98.22%accuracy value in the case of the Br35H dataset however,an accuracy of 98.01%has been achieved in the case of the FigShare dataset.

关键词： Brain tumor convolutional neural network gray level co-occurrence matrix noninvasive FigShare dataset Br35H dataset

Image Based Smoke Detection Using Source Separation

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光谱学与光谱分析 2019年第3期39卷 982-989页

作者： Ouiem Bchir Mohamed maher Ben Ismail Norah Asiri Computer Science Department College of Computer and Information SciencesKing Saud University

In this paper, we propose an automatic image based smoke detection using source separation. In particular, we assume that the region of interest(smoke region) is a linear combination of smoke and background pixels, and we estimate the smoke component. More specifically, we extend the linear hyperspectral unmixing techniques to the context of image based smoke detection in order to separate the smoke component from the background. The proposed approach yields promising results especially with smoke images captured outdoor.

关键词： Pattern recognition Computer science Hyperspectral

Evaluation of Cyber Security Based on Niagara Framework

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Evaluation of Cyber Security Based on Niagara Framework

作者：马和（ALBETTAR maher）兰州理工大学

学位级别：硕士

物联网(Internet of Things)作为新一代信息技术的重要组成部分,逐渐被应用到环境监测、智能交通、工业生产、物流跟踪等领域。Tridium公司研发了Niagara物联网框架用于搭建物联网监控系统,以实现泛在网络异构设备互联互通。Niagara框... 详细信息

物联网(Internet of Things)作为新一代信息技术的重要组成部分,逐渐被应用到环境监测、智能交通、工业生产、物流跟踪等领域。Tridium公司研发了Niagara物联网框架用于搭建物联网监控系统,以实现泛在网络异构设备互联互通。Niagara框架作为一套开放的物联网平台,使用Java虚拟机作为跨操作系统和硬件平台的通用运行的环境,该框架设计兼容所有网络集成协议,也适用于能够运行Java虚拟机的嵌入式系统。该框架实现了自下而上各个功能的模块化开发和封装,并以Java库的方式开放出来,供第三方开发者调用。但是这给安全漏洞和隐患的产生提供了条件,基于Niagara框架的应用系统也将面临很多安全风险和威胁。目前,Niagara框架的研发和应用还处在起步阶段,框架本身也存在一些潜在安全漏洞,需要进一步的修复和完善工作。在2018年6月发布的新版本中,Tridium公司对Niagara AX和Niagara 4中存在的安全漏洞进行了修复工作。其中威胁级别较高的一个是路径遍历漏洞,该漏洞存在于Niagara 4 Framework 4.4之前版本中。该漏洞源于程序未能充分的过滤用户提交的输入。远程攻击者可借助合法的平台管理员凭证利用该漏洞获取敏感信息。目前Tridium公司已发布升级补丁修复了该安全漏洞。随着Niagara物联网框架的版本升级和监控系统中的应用部署,会出现各种不同类型的安全漏洞,需要研发人员持续的检查和修复工作,研究该框架的安全问题也是一项有意义的工作。本文分析了针对Niagara物联网框架的典型安全威胁和攻击方式,包括通过公司信息系统去访问未经授权访问工业网络,从而对Niagara框架及其网络系统进行攻击。本文首先描述了Niagara框架的基本组成结构,在此基础上讨论了与Niagara框架有关的典型威胁。针对不同安全威胁,本文提出了各自的解决方案。本文主要涉及三种安全威胁以及解决方案。第一种是Cookie和会话ID攻击。为了避免Cookie和会话ID攻击,我们需要避免会话劫持,并确保登录页面中涉及经过身份验证的Cookie。第二种是CSRF攻击,当使用Servlet页面时会发生该种攻击。为了避免这种攻击,本文提出了向Servlet页面添加一个身份验证令牌的方案。第三种攻击是网络攻击,发生在请求权限的时候,为了避免这种攻击,需要检查Niagara框架模块上的请求权限。本文对上述三种安全威胁做了安全评估,分析了存在的Niagara框架的潜在安全漏洞,研究了针对Niagara物联网框架可能攻击因素。针对三种不同的安全漏洞,提出了解决方案,并做了安全验证实验。测试实验表明,本文提出的应对方案是有效的,可以消除潜在的安全漏洞,在一定程度上可以提高Niagara框架的安全性能。

关键词：网络安全物联网安全 Niagara框架嵌入式系统 JACE控制器