3,432 research outputs found
Antimicrobial Effect of Zinc Oxide Nanoparticle Coating on Titanium 6 Aluminum 4 Vanadium (Ti-6Al-4V)-Fixed Orthodontic Retainer Substrate
No full textObjectives Due to its excellent biocompatibility, superior mechanical qualities, and exceptional corrosion resistance, titanium 6 aluminum 4 vanadium (Ti-6Al-4V) alloy is frequently used for medical and orthodontic purposes as a fixed retainer after active orthodontic treatment. Titanium lacks the antibacterial characteristics and is bioinert, this may influence the usage of such materials in the field of biomedical applications. Bacterial adhesion to the orthodontic retainer surface is a common first step in infection; this is followed by bacterial colonization ending with the formation of a biofilm. Once biofilm forms, it is highly resistant to medicines and the host immune system's defense mechanism, making it difficult to remove the biofilm from orthodontic retainer. This study aimed to test the antimicrobial effect of a zinc oxide (ZnO) nanoparticle coating on Ti-6Al-4V orthodontic retainers. Materials and Methods ZnO nanoparticles, with a particle size of 10 to 30 nm, were used to coat the alloy using the electrophoretic deposition method. Various parameters and surface characterization tests were employed to obtain an optimized sample. This sample was subjected to the microbial adherence optical density test to examine the adherence of Streptococcus mutans, Lactobacillus acidophilus bacteria, and Candida albicans. Results The optimized sample had a 5-mg/L ZnO concentration, applied voltage of 50 V, and a 1-cm distance between electrodes. The ZnO coating significantly reduced microbial adherence compared to uncoated samples, effectively inhibiting bacterial development. Conclusion Electrophoretic deposition is an efficient and cost-effective technique for coating orthodontic titanium retainer substrates. Coating Ti-6Al-4V with ZnO nanoparticles increased the antimicrobial effectiveness of the material and as the concentration of the nanoparticles rises, the antimicrobial effect increases too
Nakit akışı üretimi ve BİM ve simülasyon ile alternatif analiz
No full textCash flow analysis is a major aspect of managing a construction project to improve project success metrics and to prevent liquidity issues during construction phase. Conventional methods used to analyze cash flow simplify many process elements and perform analysis based on master-level schedule activities and their associated costs. Recent studies generate cash flow using building information models (BIM), construction schedule and financial parameters for more accurate project cash flow, but it is challenging to evaluate detailed project alternatives that improve project cash flow while satisfying project constraints and consider scenarios for project financials. This thesis develops a structured approach to generate project cash flows through a BIM and resource-integrated 3D simulation platform called GSimX. It also provides a prototype for project cash flow generation through Excel in order to verify and compare it with the simulation platform. Since cash inflows and outflows from simulation are generated based on common cash flow parameters with contractual focus, cash flow alternatives can easily be obtained by modifying parameters such as payment terms, activity sequences, and resources. The thesis also describes ways to evaluate generated cash flow alternatives to enhance the financial decision-making process and to avoid financial hurdles during project execution.Nakit akış analizleri inşaat yönetimi, projenin etkili bir şekilde ilerleyebilmesi ve oluşabilecek sorunların önüne geçilebilmesi adına büyük önem taşır. Kullanılan geleneksel nakit akis analizi yöntemleri ağırlıklı olarak basit düzeylerde olup, analizler genelde master program seviyesinde sağlanmakta ve aktivite bazında gerçekleştirilmektedir. Daha önce yapılan çalışmalarda nakit akışları yapı bilgi modellemesi (BIM) kullanılarak oluşturulmakta ve bu anlamda iş programı, kaynaklar, finansal parametreler ve diger etkenlerde goz onunde bulundurulmaktadir. Fakat alternatif nakis akış yöntemlerini incelemek ve bunlar hakkında belirli sonuçlara varmak zorlu olmakla beraber, projenin verimliği üzerinde etkili olabilir ve finansal anlamda değişik senaryoların incelenip uygulanmasında yardımcı olabilir. Bu tez proje nakit akışlarını BIM ve kaynak tabanlı bir simülasyon platformu olan GSimX üzerinde oluşturmak için yapısal bir yaklaşım geliştirmektedir. Bu amaçla gerekli inşaat nakit akışı parametreleri tanımlanmıştır. Excel üzerinde oluşturulan bir prototip nakit akışı ile yaklaşımı tanımlanmış ve elde edilen sonuçlar simülasyon sonuçları ile karşılaştırılabilir düzeye getirilmiştir. Bu tez ayrıca nakit akışının parametreler üzerinde simülasyon ortamında hesaplanması için gereksinimleri tanımlamıştır. Nakit akışları kontrat ağırlıklı yaygın parametreler üzerinden simülasyon sonrası hesaplandığından alternatif senaryolar ödeme şartları, aktivite sıralaması ve kaynaklar gibi farklı değişkenler kullanılarak kolayca oluşturulabilir. Ayrıca sunulan bu tezde oluşturulan alternatif karşılaştırılması için yöntemler tanımlanmakta, dolayısıyla projenin finansal karar verme sürecini geliştirilmekte ve imalat sırasında finansal problemlerin azaltılmasına katkıda bulunulmaktadır
Factors affecting adoption and effectiveness of the extension program in the Nabatiyeh area of southern Lebanon - by Omar Mohammed Khalaf
No full textThesis (M.S.)--Agriculture, A.U.B.Includes bibliographical references
GSM ve IOT teknolojisine dayalı akıllı güvenlik ve güvenlik sistemi tasarımı ve uygulaması
No full textYüksek LisansGüvenlik sistemleri ve güvenlik sistemleri, evleri, şirketi, altın dükkanlarını veya diğer kurumları ve yangın veya gaz kaçağına maruz kalma ve hatta hırsızlar tarafından soyulma gibi felaketlerden kaynaklanan mülkleri korumadaki önemi nedeniyle yaşamlarımızda büyük bir rol oynamaktadır. Güvenlik ve güvenlik sistemleri, teknolojinin gelişmesi ve çeşitli akıllı mikrodenetleyiciler ve kameralar, Kızılötesi sensörler, gaz kaçağı sensörleri ve diğerleri akıllı sensörler gibi akıllı elektronik parçaların ortaya çıkmasıyla birlikte gelişmeye başlamıştır. Önerilen bu sistemde, bazı tespit sensörleri ile desteklenen Arduino mikrodenetleyici kartı kullanılarak, hareket algılamak için PIR sensörü, yangın algılamak için alev sensörü, gaz kaçağı tespit etmek için gaz sensörü, GSM gibi çok seviyeli ev güvenlik ve emniyet sistemi uygulanabilir. modül, lazer, depolama kamerası, alarm, yangın söndürme pompaları gibi diğer takma donanımları cihazı da, bu donanımı, bize güçlü bir sensör sağlayan çok çeşitli sensörler, kalkanlar ve modüller kullanarak daha akıllı ve akıllı sistemler tasarlamak ve uygulamak için kullanabilir. Arduino'nun kolay programlama dili ve büyük proje örnekleri ve büyük topluluk, düşük güç gereksinimi, ucuz fiyat ve iyi performans ile işlevsellik Arduino'yu en ünlü kontrolörlerden biri olmaya itiyor. Önerilen sistem, ev güvenliği ve ev güvenliği ile ilgili olan büyük bir sorunu çözecektir. Ek olarak, ev sahibi, çeşitli ev aletlerini AÇIK / KAPALI konuma getirebilir, ev sahibinin tüm bu kablosuz olarak ve dünyanın herhangi bir yerinden belirli bir IP adresi aracılığıyla yapabileceği IoT teknolojisi ile gaz kaçağını, yangını ve güvenliği izleyebilir Mikrodenetleyici tarafından verilir.The safety systems and security systems take a big role in our lives because of their importance in protecting homes, company, gold shops or other institutions and properties from disasters such as exposure to fire or gas leakage and even being robbed by burglars. The security and safety systems have begun to evolve with the development of technology and the emergence of various types of smart microcontrollers and intelligent electronic parts such as cameras, Infrared sensors, gas leak sensors and others smart sensors. In this proposed system can implement multi-level home security and safety system by using the Arduino microcontroller board supported with the some hardware sensors like that PIR sensor for the motion detecting , flame sensor for fire detecting , gas sensor for the gas leak detecting , GSM module, laser, storage camera, other chock equipment device such as alarm , fire extinguishing pumps , also can use this hardware to design and implement more smart and intelligent systems by using a wide range of available sensors, shields and modulus which provide us a powerful functionality with low power requirement , cheap price and good performance also the easy programming language of Arduino and the big project examples and large community push the Arduino to be one of the most famous controllers. The proposed system will solve a big problem that's which related with the home security and home safety. In additionally the home owner can turning ON/OFF the various of home appliances, monitor the gas leak, fire, security through the IoT technology where the home owner can be doing all of this wirelessly and from any area of the world via specific IP address granted by the microcontroller
The Impact of Teaching Physics by Electronic Packages in Devolvement of critical thinking skills for 9th Grader's in Jordan. Dr. Ayman Mohammed Khalaf Oliemat Ministry of Education, Jordan
No full textBobby Mohammed … A Steelpan Legend Re-emerges
No full textThe author interviews Lennox "Bobby" Mohammed, the sprightly and spiritual 71-year old arranger as he reflects and comments on his re-emergence on the music scene. Mohammed became the youngest arranger to win a Panorama title at the age of 22 in 1965 and was honoured with one of the country's highest national awards, the Humming Bird Medal Gold
Experimental and numerical analysis of flow mixing in packed beds
No full textOtto-von-Guericke-Universität Magdeburg, Fakultät für Verfahrens- und Systemtechnik, Dissertation, 2017vorgelegt von M. Sc. Ali Mohammed Ridha Al-KhalafLiteraturverzeichnis: Seite 127-12
Energy Efficiency Evaluation of Different Glazing and Shading Systems in a School Building
No full textThe energy conversations methods and techniques take a significant role in the energy performance of the buildings. Façade and shading systems are in continuous development, and recent studies are showing the importance of implementation of such systems to reduce energy consumption and enhance the effectiveness of the building performance. School buildings are mostly being used during daytime, hence, require active use of sunlight. A measure that is taken on a school building envelope can prevent overheating and overcooling and reduce the heating and cooling energy consumption but at the same time can increase the lighting energy consumption vice versa. Thus, it is necessary to optimise the energy required for climatisation of a building with lighting energy demand. The main aim of the paper is to provide analysis for façade and shading systems applied to a school building and study the effectiveness of it on energy consumption and conservation. The case study for this paper is a typical building project designed to be located in Istanbul, Turkey and has a traditional façade system which is clear double layer windows without any shading devices. The analyses of the energy efficiency of these systems will be presented. The different glazing types and shading systems alternatives will show the most efficient one to be used as some optimised alternatives for the systems. Findings indicate that proper glazing and shading systems can reduce the needed energy for heating and lightening and thus total energy consumption of a school building significantly
አላሁ፡መስሊ፡አለሙሀመድ፡ያለመሁዳ፡ሳቡኝ፡ካንቱ፡ዘንዳ
No full textThe entire manuscript is available for download as a single PDF file. Higher-resolution images may be available upon request. For technical assistance, please contact [email protected]. Fieldwork Team: Gabeyehu Adugna (Principal Investigator), Rachel Dwyer (Principle Investigator) Ahmed Tayib (Local Project Manager), Muhammed Jawad (Boston Facilitator). Technical Team: Prof. Fallou Ngom (Project Director and the Former Director of African Studies Center), Eleni Castro (Technical Lead, BU Libraries), and Ethan Key (Intern, BU Libraries). The fieldwork team would like to thank the following individuals and institutions who provided vital assistance in facilitation and consultation during fieldwork: Dr.Endris Mohammed, Professor, Addis Ababa University Linguistics Department, Addis Ababa, Ethiopia; Hussein Kassim Mohammedsani, PhD candidate. Addis Ababa University Linguistics Department, Addis Ababa, Ethiopia; Ethiopian Islamic Affairs Council, Addis Ababa, Ethiopia. Additional thanks to to the staff of the Rahnile Hotel in Bahir Dar.
This collection of Amharic Ajami manuscripts are copied as part of the African Studies Center's African Ajami Library.
Access Condition and Copyright: These materials are subject to copyright. All rights reserved to the author. For use, distribution or reproduction contact Professor Fallou Ngom ([email protected]).
Materials in this web edition may be cited as: Adugna, G., Dwyer,R., Ngom, F., and Castro, E. (2021). African Ajami Library: Amharic Ajami Manuscripts. Boston: Boston University Libraries: http://hdl.handle.net/2144/39804. For Inquiries: Please Contact Professor Fallou Ngom ([email protected]).Provenance / Custodial history: This manuscript is owned by Ahmed Tayib of Debre Tabor, Ethiopia. Ahmed Tayib is the son of the author. This is an original work written by Mohammed Hassan Zite in 1965 EC (1972 CE/AD). The author had studied in several regions of Ethiopia, including the Dana mosque, in Tigray, and in Yajju areas. He was a teacher in Bahir Dar, and now, in his nineties, lives in the Begemder region. Handwritten manuscript on ledger lined paper using black ink (marker?) for the rasm and i'jam, but including blue ink (ball point pen?) for the harakat (vowel diacritics). The title uses a character for "ñ" which is a "ي" with an additional dot. Photographed in Bahir Dar, Ethiopia.This manzuma expresses the longing (ናፍቆት, nafqot) to be with Allah. It uses some words and phrases in the Amharic language that relate especially to the Gondar region.The contents of this collection were developed with support of the Title VI National Resource Center grant # P015A180164 from the U.S. Department of Education. However, those contents do not necessarily represent the policy of the U.S. Department of Education, and you should not assume endorsement by the Federal Government
Implications of the Improvement of Teaching Quality for Professional Development (PD) of Academics at the Colleges of Applied Sciences (CASs) in the Sultanate of Oman
No full textThe Oman Accreditation Council (OAC), which is called later the Oman Academic Accreditation Authority (OAAA), designed a higher education institution (HEI) Quality Assurance (QA) framework for Omani public and private Higher Education Institutions (HEIs), starting with a quality audit process in 2008. The Colleges of Applied Sciences (CASs), as a public HEI, are required to ensure the quality of all services and activities to meet particular national standards (specified in the framework) in order to gain a HEI and programme certificate. In line with a quality audit scope, the quality of the fields of PD and related teaching quality should be ensured and enhanced by the promotion and contribution of the former field to the maintenance and improvement of the latter one.
The chief purpose of this study was to identify the uptake and implications of the growing requirement to improve teaching quality and the PD of academics at the CASs in the Sultanate of Oman especially in the context of the application of the QA framework. The study focused on examining the academics’ participation in professional development programmes (PDPs) and current perceptions of PD with respect to the improvement of teaching quality improvement at these colleges. The current study also dealt with a reorganization and prioritization of academics’ PD needs, barriers to effective PD, and factors to enhance PD of academics regarding teaching quality improvement in the colleges.
Based on the purpose and research objectives, the current study adopted both positivist (quantitative) and interpretive (qualitative) research paradigms. Because the study perused quantitative and qualitative data regarding certain variables, it chose a mixed-research design. The researcher designed survey questionnaire to collect quantitative data and a semi-structured interview and a focus group discussion to probe and interpret quantitative findings. After fulfillment of the validity and reliability measurements, a self-completion questionnaire was distributed to a stratified random sample of academics (170) over the six CASs. A total of 150 questionnaires (out of 170) were completed and returned and the response-rate reached 88.2%. The quantitative data was analyzed by appropriate analysis using the Statistical Package for Social sciences (SPSS), while the qualitative data was analyzed by appropriate qualitative analysis.
The findings of the study showed that the level of academics’ participation in PDPs to improve teaching quality in the last two years in the CASs seems to be unsatisfactorily low. The current perceptions of the PD situations in the colleges, relating to teaching quality improvement, signified a shortage in the number of available PDPs and/or a discouragement of academics’ participation in these programmes in the last two years. The study also revealed all the 22 PD needs of academics regarding the improvement of teaching quality are significantly demanded by participants; the higher rated needs focused on a development of ‘student centred’ skills, such as critical thinking and problem-solving skills.
Furthermore, the study illustrated that the highest significant perceived barriers to effective PD in the CASs, as related to teaching quality improvement, focus on a lack of a clear institutional PD policy and a lack of appropriately systematic PD plans. The study also revealed all 10 perceived factors to enhance PD regarding teaching quality improvement are very important. The most significant factors represented and stressed particular problematic issues (the high rated barriers) and a reduction of a heavy workload to enhance academics’ participation in PD regarding the improvement of teaching quality.
Conclusions drawn from the discussion of the findings of study include a lack of a clear PD policy at national and institutional levels and absence of a particular authority/unit concerning PD issues in Omani HEIs. The two problematic issues resulted in a lack of systematic and realistic PD plans in the CASs, involving a lack of academics’ involvement in PD plans, a misconnection of academics’ PD needs to PD, inappropriate facilities and resources allocation, and inappropriate evaluation processes of PD. In addition, the conclusions also include that PD of academics regarding the improvement of teaching quality in the colleges requires more attention and focus to manage particular significant issues perceived by participants as both barriers and potential facilitators relating to PD of academics.
Based on identified conclusions, particular implications for policy and practice to enhance PD to improve teaching quality were set at three levels: governmental, institutional, and individual. Moreover, achievements of the current study according to the research questions were identified and contributions of the study to the fields of PD, teaching quality, and the context of QA and quality audit in HE were addressed. Based on the findings and conclusions, particular directions and recommended issues were suggested to be studied by further research to benefit the enhancement of PD and related teaching quality improvement
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