Scientific Research Communications最新文献_第3页

Watt Six-Bar Compliant Mechanism Analysis Based on Kinematic and Dynamic Responses 基于运动学和动力学响应的瓦特六杆柔性机构分析

Scientific Research Communications Pub Date : 2021-07-29 DOI: 10.52460/src.2021.002

Ç. Uyulan, Batuhan İpek

{"title":"Watt Six-Bar Compliant Mechanism Analysis Based on Kinematic and Dynamic Responses","authors":"Ç. Uyulan, Batuhan İpek","doi":"10.52460/src.2021.002","DOIUrl":"https://doi.org/10.52460/src.2021.002","url":null,"abstract":"In this study, a complete guide to kinematic and kinetic analyses of a Watt type six-bar compliant mechanism is conducted incorporating the flexible buckling of the initially straight element. In the analysis procedure, the hybrid utilization of the pseudo-rigid-body model (PRBM) and the nonlinear elastic theory of beam buckling is presented. This partially compliant mechanism comprises three rigid links and two flexible links. The kinematic analyses of the mechanisms are done by using the vector loop closure equations, the PRBM of a large deflection cantilever beam, and derivation of nonlinear algebraic equations considering the quasi-static equilibrium and load-deflection curve of the flexible parts. Each of the elastic parts makes up a buckling pinned-pinned flexible Euler beam. The vector loop equations are combined with Newton-Euler dynamic formulations to provide the simultaneous constraint matrix. After these operations, the full mechanism is simulated to get both accelerations and forces for each time step. Finally, the design method is validated through experimental results. The findings derived from the combination of buckling elastica solution and PRBM approach enable the analysis of Watt's six-bar compliant mechanism.","PeriodicalId":400190,"journal":{"name":"Scientific Research Communications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130605900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Re-Examine Conventional Concepts in Urban Design: The Conflict Between Urban Space Utilization and the Elements of Power and Control - Case of Hawkers within Amman, Jordan 重新审视城市设计中的传统观念:城市空间利用与权力与控制要素的冲突——以约旦安曼的小贩为例

Scientific Research Communications Pub Date : 2021-07-29 DOI: 10.52460/src.2021.003

Dania Abdel-Aziz

{"title":"Re-Examine Conventional Concepts in Urban Design: The Conflict Between Urban Space Utilization and the Elements of Power and Control - Case of Hawkers within Amman, Jordan","authors":"Dania Abdel-Aziz","doi":"10.52460/src.2021.003","DOIUrl":"https://doi.org/10.52460/src.2021.003","url":null,"abstract":"Architecture and urbanism are disciplines based on knowledge of space. From this point of view, this research aims to study the challenges of dealing with hawkers (Street Vendors) in Jordan's urban centres generally by shedding light on downtown Amman. Although they succeed in acquiring and controlling space informally in Amman, hawkers have been ignored by local planners and even been harassed by local authorities for not being given space to operate their businesses. Rigid transformations should be carried in urban planning strategies in downtown Amman. Local policies need to be enforced to end this conflict and provide suitable conditions and capacities to read and respond to the hawkers' needs. They represent an integral part of the region's urban fabric. This study is based on reviewing related literature, field survey, and observations carried out for two months in the study area. In addition to several informal discussions held with the hawkers, pedestrians, merchants, and local authorities, questionnaires were used to clarify specific issues. The study suggests a few recommendations to help fulfil urban centres' effective utilization and harmonize formal activities and the hawkers in order to resolve this conflict. The study found that street hawkers are only considered troublemakers and have never been involved in decision-making when urban planning occurs. These will be an ongoing issue, not unless they are integrated into the planning processes. The study suggests different scenarios for proper allocation of hawking space can be done regarding accommodating them according to their space requirements worked out the basis of the products sold, as has been done in the present study. In short, this will help in providing suitable trading environments for the hawkers, creating a pedestrian-friendly neighbourhood, decreasing the unemployment rate, among other advantages.","PeriodicalId":400190,"journal":{"name":"Scientific Research Communications","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126319365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Some Compact Operators on the Hahn Space Hahn空间上的一些紧算子

Scientific Research Communications Pub Date : 2021-07-29 DOI: 10.52460/src.2021.001

E. Malkowsky

引用次数: 4

Ensemble of Classifiers and Term Weighting Schemes for Sentiment Analysis in Turkish 土耳其语情感分析的分类器集成和术语加权方案

Scientific Research Communications Pub Date : 2021-07-29 DOI: 10.52460/src.2021.004

Aytuğ Onan

{"title":"Ensemble of Classifiers and Term Weighting Schemes for Sentiment Analysis in Turkish","authors":"Aytuğ Onan","doi":"10.52460/src.2021.004","DOIUrl":"https://doi.org/10.52460/src.2021.004","url":null,"abstract":"With the advancement of information and communication technology, social networking and microblogging sites have become a vital source of information. Individuals can express their opinions, grievances, feelings, and attitudes about a variety of topics. Through microblogging platforms, they can express their opinions on current events and products. Sentiment analysis is a significant area of research in natural language processing because it aims to define the orientation of the sentiment contained in source materials. Twitter is one of the most popular microblogging sites on the internet, with millions of users daily publishing over one hundred million text messages (referred to as tweets). Choosing an appropriate term representation scheme for short text messages is critical. Term weighting schemes are critical representation schemes for text documents in the vector space model. We present a comprehensive analysis of Turkish sentiment analysis using nine supervised and unsupervised term weighting schemes in this paper. The predictive efficiency of term weighting schemes is investigated using four supervised learning algorithms (Naive Bayes, support vector machines, the k-nearest neighbor algorithm, and logistic regression) and three ensemble learning methods (AdaBoost, Bagging, and Random Subspace). The empirical evidence suggests that supervised term weighting models can outperform unsupervised term weighting models.","PeriodicalId":400190,"journal":{"name":"Scientific Research Communications","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133434375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 31

The Impact of COVID-19 on Users' Visit to the Shopping Centers in Libya 新冠肺炎疫情对利比亚用户逛购物中心的影响

Scientific Research Communications Pub Date : 2021-07-29 DOI: 10.52460/src.2021.005

Hafith Mohammed Sulayman Almansouri, Mehmet Çetin

引用次数: 1

On Local Scouring at Single Piers 在个别码头进行本地淘货

Scientific Research Communications Pub Date : 2021-07-29 DOI: 10.52460/src.2021.006

António Heleno Cardoso, Cristina Maria Sena Fael, Rui Miguel Madeira Lança

引用次数: 0