Face milling of nickel-based superalloys with coated and uncoated carbide tools

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Stress analysis of thin bedded mine roofs subjected to evenly distributed lateral load and supported by barrier pillars

“Theoretical stress analysis in mine structures begins with the assumption that the structural elements are homogeneous, isotropic and perfectly elastic. It is this writers belief that stresses in a mine roof supported by barrier pillars may be compared to those stresses which may be found in a thin plate supported and restrained in the manner similar to such a mine roof. Therefore the stress and moment equations developed for plates are herein applied to mine roofs of limited thickness. A thin roof bed which is stressed with evenly distributed lateral load and supported with barrier pillars will be regarded as a large rectangular plate clamped at the two longitudinal ends and with the other edges simply supported. Figure 1a shows the free body diagram or such a plate. AB and CD are built-in or clamped edges, and AD and BC are simply supported edges. My is the bending moment along the built-in edges, and q is the unit load on the mine roof bed. The weight of the bed per unit area may be included into the q. The moment My will be considered positive and when it produces compression at the top of the bed. The most convenient method to analyze the stresses in such a plate will be to find a general equation for the deflection of a rectangular plate which is loaded similar to the mine roof bed. To determine the general equation of bending for such a plate it is necessary to take two general cases of bending of plates: One of which is the bending of a plate by moments along the edges of the plate as shown in Figure 1c, and the other one is the bending of the plates by evenly distributed load, Figure 1b, and then superimpose them to apply for a plate which is subjected to evenly distributed loads and contains bending moments along two parallel edges. First, the relations between the bending moments and the curvature in pure bending of plates will be determined”—Introduction, pages 1-2

High-raised buildings in urban area contributes to the snatch theft incidents / Anith Nabilah Mustafa and Siti Rasidah Md Sakip

Snatch theft incidents are on the rise in Malaysia especially in the cities. It tendsto happen in cities because there is a possibility to commit it and both crime and urban are often associated with each other. The aim of this paper is to find out whether the buildings with two or more levels in urban area contributes to the snatch theft incidents. The present study has been taken up to detect the hotspots of snatch theft in Selangor, Malaysia. The crime data were obtained by requesting and analysing the index crime statistical data from the Royal Malaysian Police (RMP). This study made use of the Geographical Information System (GIS) where its 3D modelling function to construct, assess and analyse the area with high snatch theft cases. The crime reports of 2010 until 2015 were geocoded and the crime maps were prepared in ArcGIS 10.2. It was found that the hotspot area is a mix-used development area which consists mainly of commercial and residential areas of more than two-level buildings

Hastane enfeksiyonlarına karşı implant yüzeylerinden kontrollü ilaç salımı

Hastane enfeksiyonları vücuda yerleştirilen implant malzemelerinin başarısını etkileyen en önemli faktörlerden birisidir. Enfeksiyonlar sonucu hastalar ciddi ağrılara maruz kalabilir, doku ve implant malzemesi arasındaki bağlanma zayıflayabilir, revizyon cerrahisi gerekebilir, hastadan implantın geri alınması söz konusu olabilir. Bu çalışmada enfeksiyonlarının önlenmesinde kullanılabilecek bir polimer/metal (kitosan/titanyum) sistemi üzerinde kontrollü antibiyotik (gentamisin) salım çalışmaları yapılmıştır. İlk olarak antibiyotik yüklü polimerler titanyum yüzeylere tutuklanmış, sonrasında farklı kuruma koşullarına (hava ile kurutma-liyofilizasyon) maruz bırakılmıştır. Liyofilizasyon işlemi uygulanan yüzeylerde porlu yapılar elde edilmiştir. Porlu yapının hem yüzeylerden salımı yapılan antibiyotik miktarı üzerine hem de kemik hücrelerinin yüzeylere tutunması ve çoğalması üzerine olan etkileri incelenmiştir. Sonuç olarak liyofilizasyon işlemi sonrasında oluşan porlu yapıların yüzeylerden antibiyotik salımını arttırdığı görülmüştür. Hücre çoğalması testi (MTS) ise özellikle 5. günde porlu kitosan ile kaplı titanyum yüzeylerinde kemik hücrelerinin düz kitosan kaplı yüzeylere kıyasla çok daha fazla çoğaldığını göstermiştir.Hospital infections are one of the most important factors that affect the success of implant materials. Patients may have strong pain, integration between newly formed tissue and implant material may weaken, revision surgery may be needed, and even implant may be taken back from the patient as a result of infections. In this study, a polymer/metal (chitosan/titanium) system that can be used to prevent infections was tested in controlled antibiotic (gentamicin) release studies. Firstly, antibiotic loaded polymers were immobilized onto titanium substrates and then these samples were exposed to different drying conditions (air drying-freeze drying). Porous structures were formed on the titanium samples after freeze-drying. The effects of porous structure on the amount of released antibiotic from surfaces and osteoblast attachment & proliferation were investigated. As a result, it was shown that porous structures leaded to an increase in released antibiotic amount. Furthermore, cell proliferation test (MTS) showed that cell proliferation was higher on porous chitosan coated surfaces than smooth chitosan coated surfaces, especially at day 5.Publisher's Versio

Bullying in School: Evaluation using CPTED at potential bullying area

Bullying in schools is a worrying phenomenon and has an impact on the safety of school children.  This paper aims to identify potential spaces of bullying behaviour in the school area. The questionnaire and observation checklist is an instrument to determine the frequency of student bullying in specific spaces of a school. Students from Form One until Form Three are the respondents in this research. Three areas with high rates of Bullying which are toilet, class and canteen. The maintenance element is the most crucial factor that space is not visited by students and potential area of Bullying. Keywords: Bullying, school, physical environment, CPTED eISSN: 2398-4287 © 2020. The Authors. Published for AMER ABRA cE-Bs by e-International Publishing House, Ltd., UK. This is an open access article under the CC BYNC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia. DOI: https://doi.org/10.21834/ebpj.v5iSI2.2520

Measuring Crime Prevention through Environmental Design in a Gated Residential Area: A Pilot Survey

AbstractIn gauging the Crime Prevention through Environmental Design elements in residential areas, the observation approach often used as a measurement method. However, these evaluations merely based on observations are seen to be inadequate. This is due to the fact that CPTED is closely tied to the community in order to ensure success of the concept. Therefore, the pilot study was conducted at gated residential areas located at Burmah Road at Bukit Jambul in Penang, Malaysia. The results found the level of reliability and validity using Cronbach Alpha (α) index for all components of CPTED are 0.6 and above

Community happiness the distinct role of environment setting relatedness / Siti Rasidah Md Sakip, Khalilah Hassan and Azran Mansor

This study argues that although scenic beauty, preference, and restoration are correlated due to their functional significance over evolution. A total of 86 respondents were randomly selected involving in this study. Exploratory Factor Analysis (EFA) is used in the early stages to gather information about the interrelationships among variables. The Cronbach’s Alpha (α) value was used to determine the level of reliability through the internal consistency for each factor.The objective of this paper is to determine the factors that influence on Happiest Selama Community. The output will be used to find the relationship between environmental setting and factors of quality of life among residents in Selama district

Mapping Isolated Places in School in Concurrence with Bullying Possibility Elements

This study aims to indicate isolated places in school in concurrence with bullying specific environments and elements. Observation student's density was conducted in the school and analysed using the Geographic Information System (GIS). A thorough observation conducted at the isolated areas using CPTED element checklist. The results of the study reveal that the CPTED element which triggers the isolated places mostly cause by maintenance condition on window and wall. Rather than that, shrubs and decorative sculpture could block the sight in isolated areas. These results may help the school's authorities to optimise existing features to decrease the possibility of bullying.Keywords: CPTED; physical environment, bullyingeISSN: 2398-4287 © 2019. The Authors. Published for AMER ABRA cE-Bs by e-International Publishing House, Ltd., UK. This is an open-access article under the CC BYNC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia.DOI: https://doi.org/10.21834/e-bpj.v4i12.1913