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Effects of humidity on shear behavior of bamboo

Theoretical & Applied Mechanics Letters 2015年第6期5卷 236-243页

作者： sina askarinejad Peter Kotowski Faezeh Shalchy Nima Rahbar Department of Mechanical Engineering Worcester Polytechnic Institute Department of Civil and Environmental Engineering University of Massachusetts Department of Civil and Environmental Engineering Worcester Polytechnic Institute

Bamboo is a naturally occurring biological composite, however its microstructure and hence its properties are very complex compared to the manmade composites. Due to optimization, it can be assumed that the variation in properties along the thickness of the culm be a smooth transition for better bonding strength between layers and to prevent non uniformity in stress concentration. As a consequence, biological structures are complicated and functionally graded. Hence, a realistic model that can capture the mechanical performance of bamboo is valuable in future design of robust multifunctional composites. This paper presents the results of experimental and numerical studies on the torsional （shear） properties of bamboo. The hierarchical and multi-scale structure of bamboo and the distribution of micro-scale fibers are revealed via laser scanning and atomic force microscopy. This information was incorporated into a finite element model to analyze the mechanical behavior of bamboo under torsion and to estimate the shear modulus of bamboo along the fibers. Moreover, the effects of humidity and therefore water content on the mechanical properties of bamboo were evaluated by performing torsion tests on samples maintained in environments with different humidities. Increasing the humidity does not cause a drop in the shear modulus, however, a jump in the shear modulus did occur at around 60% humidity. Results of this study indicate that the highest strength values in samples occurred in environments with humidity levels between 60% and 80% and undergo a significant drop after that. In higher humidities, the samples behave more ductile.

关键词： Bamboo Torsion test Humidity Finite element analysis

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Movement Trend Alterations in the Periaqueductal Gray(PAG)-Employed Ratbot Navigation Are Correlated with Stimulation Parameters

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Journal of Bionic Engineering 2024年第2期21卷 866-876页

作者： sina Khajei Abed Khorasani Mohammad Reza Afarinesh Vahid Sheibani Neuroscience Research Center Institute of NeuropharmacologyKerman University of Medical SciencesKerman***Iran Cognitive Neuroscience Research Center Institute of NeuropharmacologyKerman University of Medical SciencesKerman***Iran

In previous studies,Periaqueductal Gray(PAG)stimulation was used to stop ratbots from *** to the homology between the PAG and the intercollicular nucleus,which has been used for forward movement in birds,we investigated the possibility of PAG application to induce forward locomotion for the first *** a corridor maze,the traveled distances via PAG electrical stimulation were examined in nine Wistar male rats during three sessions.A custom-designed stimulator was developed to apply the *** results showed reductions in responses to stimulation over ***,the traveled distances had negative slopes during the consecutive trials(in 8 out of the 9 rats),and the slope mean was significantly different from *** was a strong correlation between the stimulation parameters(electric Charge per Phase(CPP)and the Number of Pulses(NP))and the observed *** negative Movement Slopes(MS)were highly correlated with the CPP and the NP,as the Pearson's linear correlation coefficients were−0.87 and−0.79,*** MS-CPP coefficients of determination(R-squared)were also between 0.76 and *** addition,the MS-NP coefficients of determination were between 0.63 and ***,it is concluded that the electrical stimulation parameters influence the behavioral outcomes ***,the PAG area may be considered a suitable candidate for forward locomotion control in the future if the area is harnessed effectively to prevent undesirable chaotic behaviors.

关键词： Periaqueductal Gray(PAG) Navigation Ratbot Animal-robot Forward locomotion Movement slope

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Contemporary construction in historical sites:The missing factors

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Frontiers of Architectural Research 2024年第3期13卷 487-504页

作者： sina Kamali Tabrizi Mohamed Gamal Abdelmonem School of Architecture Design and the Built EnvironmentNottingham Trent UniversityNottinghamUK Department of Architecture and the Built Environment University of YorkYorkUK

Historical sites(HSs)are akin to living entities,and their existence is perpetuated through the erection of new buildings or *** HSs need sustainable development and new construction,as existing monuments fail to meet contemporary user *** the urgent demand,many new buildings within HSs have been constructed without considering the influencing factors on contextual value,built,and natural *** oversight has led to irreversible damage to their historical *** studies have independently explored interventions,construction,and development within ***,there is a conspicuous absence of comprehensive research that concurrently addresses these issues while preserving the intrinsic value of the *** study aims to identify the variables and factors contributing to the successful design and construction of new buildings within HSs,satisfying user needs,conserving contextual values,and achieving sustainability with the natural and built *** research employs a mixed-method approach,gathering raw data through literature reviews,case studies,and expert *** study population comprised 97 experts in architectural heritage conservation and sustainable *** factor analysis was utilized for data analysis,leading to the identification of influential *** study highlights the significance of the location,function,scale,form,material,skyline,viewpoint,accessibility,reversibility,topography,sustainability,technology,structural system,lifespan,and interior design in constructing new buildings within a ***,the design of new additions should adhere to five guiding principles:integrated design,volume design,green design,compatible design,and modern *** this context,the new structures will fulfill user needs,preserve or enhance contextual values,and harmonize with the built and natural environment.

关键词： New building Contemporary construction Historical sites Sustainable development Architectural heritage

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Security Implications of Edge Computing in Cloud Networks

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Journal of Computer and Communications 2024年第2期12卷 26-46页

作者： sina Ahmadi National Coalition of Independent Scholars (NCIS) Seattle USA

Security issues in cloud networks and edge computing have become very common. This research focuses on analyzing such issues and developing the best solutions. A detailed literature review has been conducted in this regard. The findings have shown that many challenges are linked to edge computing, such as privacy concerns, security breaches, high costs, low efficiency, etc. Therefore, there is a need to implement proper security measures to overcome these issues. Using emerging trends, like machine learning, encryption, artificial intelligence, real-time monitoring, etc., can help mitigate security issues. They can also develop a secure and safe future in cloud computing. It was concluded that the security implications of edge computing can easily be covered with the help of new technologies and techniques.

关键词： Edge Computing Cloud Networks Artificial Intelligence Machine Learning Cloud Security

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Systematic Literature Review on Cloud Computing Security: Threats and Mitigation Strategies

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Journal of Information Security 2024年第2期15卷 148-167页

作者： sina Ahmadi National Coalition of Independent Scholars Seattle United States

Cloud computing plays a significant role in modern information technology, providing organizations with numerous benefits, including flexibility, scalability, and cost-efficiency. However, it has become essential for organizations to ensure the security of their applications, data, and cloud-based networks to use cloud services effectively. This systematic literature review aims to determine the latest information regarding cloud computing security, with a specific emphasis on threats and mitigation strategies. Additionally, it highlights some common threats related to cloud computing security, such as distributed denial-of-service (DDoS) attacks, account hijacking, malware attacks, and data breaches. This research also explores some mitigation strategies, including security awareness training, vulnerability management, security information and event management (SIEM), identity and access management (IAM), and encryption techniques. It discusses emerging trends in cloud security, such as integrating artificial intelligence (AI) and machine learning (ML), serverless computing, and containerization, as well as the effectiveness of the shared responsibility model and its related challenges. The importance of user awareness and the impact of emerging technologies on cloud security have also been discussed in detail to mitigate security risks. A literature review of previous research and scholarly articles has also been conducted to provide insights regarding cloud computing security. It shows the need for continuous research and innovation to address emerging threats and maintain a security-conscious culture in the company.

关键词： Cloud Security Threat Analysis Mitigation Strategies Emerging Trends Ethi-cal Considerations Data Analysis

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Amyloid-beta and tau protein beyond Alzheimer's disease

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Neural Regeneration Research 2024年第6期19卷 1262-1276页

作者： Morteza Abyadeh Vivek Gupta Joao A.Paulo Arezoo Gohari Mahmoudabad sina Shadfar Shahab Mirshahvaladi Veer Gupta Christine T.O.Nguyen David I.Finkelstein Yuyi You Paul A.Haynes Ghasem H.Salekdeh Stuart L.Graham Mehdi Mirzaei ProGene Technologies Pty Ltd. SydneyNSWAustralia Department of Clinical Medicine Faculty of MedicineHealth and Human SciencesMacquarie Medical SchoolMacquarie UniversityMacquarie ParkNorth RydeSydneyNSWAustralia Department of Cell Biology Harvard Medical SchoolBostonMAUSA School of Medicine Deakin UniversityGeelongVICAustralia Department of Optometry and Vision Sciences School of Health SciencesFaculty of Medicine Dentistry and Health SciencesUniversity of MelbourneParkvilleVICAustralia The Florey Institute of Neuroscience and Mental Health The University of MelbourneParkvilleVICAustralia School of Natural Sciences Macquarie UniversityMacquarie ParkNSWAustralia

The aggregation of amyloid-beta peptide and tau protein dysregulation are implicated to play key roles in Alzheimer's disease pathogenesis and are considered the main pathological hallmarks of this devastating ***,these two proteins are produced and expressed within the normal human ***,under pathological conditions,abnormal expression,posttranslational modifications,conformational changes,and truncation can make these proteins prone to aggregation,triggering specific disease-related *** studies have indicated associations between aberrant behavior of amyloid-beta and tau proteins and various neurological diseases,such as Alzheimer's disease,Parkinson's disease,and amyotrophic lateral sclerosis,as well as retinal neurodegenerative diseases like Glaucoma and age-related macular ***,these proteins have been linked to cardiovascular disease,cancer,traumatic brain injury,and diabetes,which are all leading causes of morbidity and *** this comprehensive review,we provide an overview of the connections between amyloid-beta and tau proteins and a spectrum of disorders.

关键词： amyloid-beta cancer cardiovascular diseases diabetes neurodegeneration Tau traumatic brain injury

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Factors Contributing to Contamination of Street Foods in Bamako, Mali

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Food and Nutrition Sciences 2024年第3期15卷 199-210页

作者： Demba Dembele Mamadou Wele Bawa Boya Haziz sina Basile Boni Saka Konmy Adolphe Adjanohoun Lamine Baba-Moussa Institute of Applied Sciences University of Sciences Techniques and Technologies of Bamako Bamako Mali Laboratory of Biology and Molecular Typing in Microbiology Faculty of Science and Technology University of Abomey-Calavi Cotonou Benin National Agronomic Research Institute of Benin Cotonou Benin

The World Health Organization states that foodborne diseases are a worldwide public health issue. Although street foods can provide nutritious and affordable ready-to-eat meals for city dwellers, their health risks can outweigh the benefits. A cross-sectional study was conducted in the Bamako district, focusing on street food vendors near schools, universities, extensive markets, administrative centers, and major roads. We aimed to sample fifty (50) sellers per municipality, making 300 sellers for the Bamako district. We developed a survey sheet to collect data, and six teams rotated between the municipalities each month. Before starting the collection, the teams were provided administrative papers approved by the municipal authority. The survey revealed three types of sales sites: fixed (65%), semi-fixed (30%), and mobile (4.40%). The proportion of sellers was 26.8%, 23.2%, 19.7%, and 4.2% in municipalities III, IV, and I. In municipalities I, II, III, IV, and VI, respectively, 92%, 95.70%, 93%, 87.2%, and 100% of the sellers were female. The age distribution of sellers was 65.63%, 46.81%, 40.82%, 38.30%, 36.17%, 36%, and 32% in the 25-34 and 35 - 44 age groups. Illiteracy rates were 59.20%, 61.70%, 55.30%, 75%, and 56% in municipalities I, II, III, IV, and VI, respectively. The study identified two categories of sellers: 48.3% in type 1 and 51.7% in type 2. The first category comprised 154 sellers, and the second 165 sellers. The survey found that 66.00%, 56.00%, 48.90%, 44.90%, 38.30%, and 34.40% of municipal V, VI, III, I, II, and IV sales sites were open-air. In municipality I, 63.30% of the sites were under hangars, while in municipalities II and IV, the corresponding percentages were 51.10% and 59.40%, respectively. Moreover, 46.00%, 31.90%, 31.30%, 30.60%, and 27.70% of the sites in municipalities VI, II, IV, I, and III were located next to gutters. In conclusion, this study identified several factors that could compromise the quality of street foods sold in

关键词： Factors Source Contamination Street Food Bamako

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Systematic Literature Review on Cloud Computing Security: Threats and Mitigation Strategies

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Journal of Information Security（信息安全） 2024年第2期 148页

作者： sina Ahmadi

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标准化微量喂养支持及抚触辅助对早产儿喂养耐受性及生长发育的影响分析

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智慧健康 2024年第16期10卷 154-156,160页

作者：谢思娜梅州市妇幼保健院广东梅州514000

目的探讨标准化微量喂养支持与抚触辅助对早产儿喂养耐受性及生长发育的影响。方法选择广东省梅州市妇幼保健院新生儿科2021年9月—2023年8月接治的早产儿100例实施研究,按1:1比例分组,对照组予常规喂养支持,观察组采取标准化微量喂养... 详细信息

目的探讨标准化微量喂养支持与抚触辅助对早产儿喂养耐受性及生长发育的影响。方法选择广东省梅州市妇幼保健院新生儿科2021年9月—2023年8月接治的早产儿100例实施研究,按1:1比例分组,对照组予常规喂养支持,观察组采取标准化微量喂养支持联合抚触辅助,比较两组的喂养耐受性及生长发育指标。结果①喂养耐受性:观察组腹胀、呕吐及胃残余量偏高等发生率较对照组低(P<0.05);②并发症:观察组感染、坏死性小肠结肠炎等发生率较对照组低(P<0.05);③生长发育指标:观察组体重、身长及头围增长幅度较对照组更为显著(P<0.05);④喂养状况:观察组全量肠胃营养、呕吐腹胀消失用时等较对照组更短(P<0.05)。结论对早产儿给予标准化微量喂养支持与抚触辅助可有效降低其喂养不耐受发生率,减少相关并发症,促进其生长发育,值得借鉴。

关键词：早产儿标准化微量喂养支持抚触辅助生长发育喂养耐受

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国际中文线上教学满意度影响因素与模型构建

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国际中文教育（中英文） 2024年第2期9卷 41-52页

作者：吴思娜北京外国语大学中国语言文学学院

基于顾客满意度模型,本研究探索了国际中文线上教学满意度的影响因素,并尝试建构教学满意度模型。本研究采用探索性因子分析法提取出1个满意度因子和7个影响因子,分别为:教学满意度、质量感知、感知价值、技术支持、生生互动、学生期望... 详细信息

基于顾客满意度模型,本研究探索了国际中文线上教学满意度的影响因素,并尝试建构教学满意度模型。本研究采用探索性因子分析法提取出1个满意度因子和7个影响因子,分别为:教学满意度、质量感知、感知价值、技术支持、生生互动、学生期望、教师形象、教师经验;利用回归分析和结构方程模型,本研究探讨了7个影响因子对教学满意度的作用关系。结果发现:教学满意度受多个因素共同影响,影响最直接也是最大的因素是感知价值和技术支持;质量感知和生生互动通过感知价值间接影响教学满意度;学生期望通过质量感知间接影响教学满意度;教师形象和教师经验通过学生期望间接影响教学满意度。教学满意度模型为国际中文线上教学满意度测评提供了一定的参考。

关键词：教学满意度线上中文教学影响因素模型构建

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