مجلة البحوث الهندسية والعلوم التطبيقية

THE MOST IMPORTANT CONFLICT FACTORS IN CONSTRUCTION PROJECTS: LITERATURE REVIEW

2023-03-22T08:58:29+00:00

Construction projects and conflict seem to go hand in hand, with difficulties appearing in the form of rising project costs, project delays, decreased productivity, lost profits, or strained business relationships. This paper's primary objective is to provide an overview of the sources of conflict in the construction sector. The study highlighted three (3) different categories of conflict variables, including those brought on by behavioral issues, contractual issues, and technical issues. Conflict-causing behavioral variables include a reluctance to verify for constructability, a lack of clarity and completeness, and poor team communication. Conflictcausing elements related to contractual issues include delayed possession transfers, delayed client interim payments, and imprecise contract requirements. Contrarily, incompetence on the part of the contractor and delayed instructions from the architect or engineer are the conflicting variables that result from technical issues. It was believed that this report would serve as advice for Handling disputes in upcoming construction projects

A REVIEW OF MAJOR CAUSES OF VARIATION REQUESTS IN THE CONSTRUCTION INDUSTRY

2023-03-23T00:43:52+00:00

Construction projects are vulnerable due to their unique qualities, and they are influenced by a variety of external and internal causes. Because of their actions, a large number of project participants produce variances in the scope and design of the projects. Natural causes can also play a role in variation requests for construction projects. Variations have a number of negative consequences in construction projects. The building sector is also influenced by a number of elements that are unique to the country. In this context, the goal of this study is to learn more about the causes and consequences of building project variances. A quantitative poll of engineers and construction management experts working in public works was used in the study, in addition to a thorough literature review public and private development projects The study concludes that differences are caused by a lack of coordination among the parties and changes in specifications by the owners, based on a review of the literature and a survey. The report also shows that the most significant impacts of building project variances are schedule overruns and cost increases. According to the findings of the survey, contracting organizations examine price terms and timing agreements when signing contracts. The study has identified a few topics for future research and knowledge expansion in the subject.

دراسة تحليل الاجهادات على قابض احتكاكي مفرد القرص باستخدام برنامج محاكاة (سولدوركس)

2023-06-11T22:21:03+00:00

في تصميم قوابض الاحتكاك للسيارات، وفي المراحل الاولى للتصميم من المهم معرفة المرونة والتشوهات التي قد تحدث للقابض وذلك يتطلب معرفة اقصى اجهادات مؤثرة على القابض لضمان متانتها وصلادتها. وفي هذا البحث تم عمل محاكاه تصميمية باستخدام برنامج حاسوبي Solidworks لاحد القوابض المستخدمة في احدى السيارات شائعة الاستعمال في ليبيا وهي من نوع (هونداي افانتي موديل / HYONDAY AVANTEY 2003) مع تغيير المادة الاحتكاكية المستخدمة في القابض باستخدام مواد مختلفة والمقارنة بين هذه المواد بتحليل الاجهادات المسلطة على القابض وكذلك معرفة التشوهات الناتجة وقد تبين ان استعمال سبيكة الفولاذ كمادة للقرص الاحتكاكي للقابض هي الانسب من بين المواد التي تم اختبارها.

DATA AND MODEL TOOLS FOR ADVANCING SOLAR ENERGY TECHNOLOGY

2023-06-11T22:29:54+00:00

Solar energy is the change of daylight into power, either specifically utilizing photovoltaics (PV), or by implication utilizing concentrated solar power (CSP). Aim of the study is to review various data and model tools for advancing solar energy technology. In this paper general introduction on solar energy was discussed, followed by the technologies of solar energy in which PV and CSP technologies were discussed. In this paper the advancement of solar energy technology in which the various area in which advancement is needed such as PV and CSP, Systems combination, soft costs and Technology to market were discussed and finally the various data and models tools for advancing solar energy technology ranging from various solar resource data to solar models and tools. From this review so far, it can inferred that various data and model tools are readily available by researchers and industrial technologist to advance solar energy to its full potential.

معايرة ألة التصوير باستخدام طريقة التحويل الخطي المباشر

2023-07-10T23:14:17+00:00

Camera calibration is an important problem for many industrial applications that use visual sensing. Camera calibration involves the calculation of the intrinsic and extrinsic camera parameters. There are many applications that require a precise calibration of the camera in order to achieve an accurate measurements for the objects that placed inside its space. This paper shows, one of the camera calibration techniques that gives high accuracy. This method is called Direct Linear Transformation.

التغلب على التحديات المستقبلية لشبكات القوى الكهربائية الليبية باستخدام كابلات التوصيل الفائق عالى الحرارة HTS Cables

2023-08-04T04:35:22+00:00

في هذه الورقة تم دراسة مشاكل وعوامل زيادة هبوط الجهد في حالة دراسية لشبكة دون النقل 66kv لاحدى مناطق الوسط الليبي، حيث تمت محاكاة ونمذجة الشبكة باحمالها الحالية والمستقبلية ولفترة 4 سنوات قادمة بهدف دراسة كيفية التقليل من مفاقيد القدرة المتدفقة والتغير في مستويات الجهود عند القضبان بالشبكة وايجاد الحلول للحفاظ على جهود القضبان في مستوى 5% من الجهد الاسمى عن طريق استخدام كوابل التوصيل الفائق HTS. وقد تم التطرق الي تاثير استبدال كوابل التوصيل الفائق HTS بدلا من خطوط النقل التقليدية وذلك للتقليل من مفاقيد القدرة المتدفقة عبر الشبكة وايضا للحفاظ على مستويات الجهد ضمن الحدود المسموح بها والطرق المثلى لوضعها بالشبكة وذلك للحفاظ على استقراريتها من الانهيار وبالتالي اظهرت النتائج تحسن ملحوظ في مستويات الجهد بالشبكة بنسبة 11.9% وانخفاض مفاقيد القدرة المتدفقة بنسبة 26% وذلك عند استبدال بعض من خطوط النقل التقليدية بكوابل التوصيل الفائق HTS بطول 44km، ومن ثم دراسة نمط سلوك هذه الشبكة من حيث استقرارية الجهد ومفاقيد القدرة عن طريق استخدام برنامج محكاة سريان القدرة NEPLAN 5.5.5

Estimation of the Thermal Conductivity of H2O-Cu Nanofluid from Molecular Dynamics Simulation

2023-09-13T09:38:11+00:00

Nanofluids are effective heat transfer medium possess remarkable thermal enhancement compared to their base fluids. The suspended nanoparticles significantly improve thermal compared to their base fluids. In this molecular dynamic simulation, the thermal conductivity of the H2O-Cunanofluid have been estimated for partial volume fractions in the range from 0.0031% to 0.0247% and temperature from 293 333 K at atmospheric pressure. The dispersed Cu-nanoparticles have spherical shape. This molecular dynamics results converge very well to the available experimental results. The thermal conductivity of the H2O-Cu nanofluid achieved 33.3 % of enhancement over base fluid at a volume fraction 0.0125 and 66.6 % at PVF of 0.02478 %. The MD results showed that the addition Cu-nanoparticles to the H2O enhances strongly thermal conductivity as volume fraction increases. However, the effects of changing temperature on the thermal conductivity was very little. Our MD study showed that thermal conductivity of H2O-Cu Nanofluid is not influenced by temperature. The MD simulation results reveals a significant outcome of this study to better understand the mechanism of enhancing thermal transport property water when dispersing selected numbers of Cu-nanoparticle (at different particle volume fractions), and to mimic nanofluid behavior to better design more efficient nanofluid.