Inner Waves Characteristics in a Stratified Ventilated Environment (The Effect of Momentum Jet)

An experimental work was carried out to investigate the effect of inner waves on the stability of flow characteristics in ventilated space. Theoretical and experimental techniques were presented. Energy dissipation by waves and its effect on the performance of ventilation was considered. Analysis of engineering systems in the bases of the internal waves and thermal concept was considered to find out the best ventilation process. The mixing process was investigated experimentally using a turbulent round jet impinged from the ceiling on the inner wave’s zone. It was carried out at a flow Reynolds number of 7,000< Re <30,000 and a flow Richardson number of 0< Ri< 200 based on the local jet scales. In the mixing process a hot and cold air are introduced to a confined space, to mix in the ventilated space to break down the waves. The results showed that the amount of momentum needed is depending on the wave’s amplitude, frequency and flow conditions. It can be seen that the jet momentum has significant influence on breaking down the inner waves and mixing the flow. Keywords: inner waves, stability, ventilated space, Energy dissipatio

Meningkatkan Kemampuan Berpikir Kritis melalui Pembelajaran Statistika Berbasis Pendidikan Politik di Lingkungan Sekolah

Maraknya lembaga hasil survei elektabilitas capres maupun caleg dalam bentuk grafik statistik, menyadarkan masyarakat akan pentingnya kemampuan melek statistika atau dikenal dengan literasi statistika. Sebagai seorang pendidik, guru memiliki peranan penting dalam membekali siswa dengan kemampuan literasi statistika. Kemampuan literasi statistika sangat berguna untuk meningkatkan kamampuan berpikir kritis siswa. Kemampuan literasi statistika ini akan berguna bagi pemilih pemula yang masih duduk di bangku Sekolah Menengah Atas atau sederajat. Metode yang digunakan dalam penelitian ini merupakan penelitian studi kepustakaan (library research). Teknik analisis data dalam penelitian meliputi 3 tahapan, organize, synthesize, dan identify. Dalam penelitian ini, akan disampaikan urgensi dan upaya peningkatan kemampuan literasi statistika dengan model pembelajaran matematika yang dikolaborasikan dengan pendidikan politik di lingkungan sekolah. Kata kunci: literasi statistika, pembelajaran matematika, pendidikan politik, berpikir kritis The increasing amount of number of electability survey result on president and vice president election in form of graphs, emerged peoples thinking on the importance of statistical literacy. As an educator, teacher has an important role in facilitating students with statistical literacy. Additionally, the skill of statistical literacy is important to enhance students critical thinking. It also has contribution to the voters especially the beginners who are the senior high school students. The method used in this research was library research. Data analysis used consisted of three phases: organize, synthesize, and identify. Through this study, the significance of statistical literacy and the effort to enhance it by conducting learning integrated with politics education in school were elaborated. Keywords: statistics literacy, mathematics learning, politics education, critical thinkin

The performance of modified jatropha-based nanofluid during turning process

The industry's extensive use of petroleum-based metalworking fluid (MWF) harms the environment and humans. The production of bio-based MWF, especially from crude jatropha oil (CJO), has therefore taken numerous initiatives. This aimed to formulate newly modified jatropha oil (MJO) with the addition of 0.05wt.% hBN and 0.05wt.% MoS2 as the nanofluid for MWF. The performance of the nanofluids was determined through the turning process in terms of cutting temperature, workpiece surface roughness, tool life and tool wear of the tool lubricated by the nanofluids. The performance of the nanofluid samples was compared with the synthetic ester (SE). From the results, after conducted 100mm axial cutting length MJO+hBN+MoS2 recorded the lowest in cutting temperature and surface roughness compared to all samples. The result shows that MJO+hBN+MoS2 has longer tool life (6500mm) compared to SE (6000mm). Abrasion and adhesion were observed as the dominant tool wear mechanism. In conclusion, MJO+hBN+MoS2 shows better machining performance and has the potential to be an environmentally friendly metalworking fluid

Evaluation of the Practicum at College of Arts and Sciences - University of Nizwa

The purpose of this study was to evaluate the practicum at University of Nizwa. The study identified the necessary skills that were acquired by student-teachers attributed through the practicum. It also aimed to identify whether there were significant differences in the evaluation of practicum due to the variable of program. The instrument used in the study consisted of 66 items. The samples of the study consisted of (48) student-teachers who were enrolled in the practicum at the college of arts and science at the University of Nizwa during the academic year 2014/2015. The results revealed that the level of evaluation of practicum was high and positive in general. Flaming of teaching, classroom management, then evaluation and feedback domains were the highest

Tarekat Naqshabandiyyah Khalidiyyah in Malaysia: a Study on the Leadership of Haji Ishaq Bin Muhammad Arif

: The Tarekat Naqshabandiyyah Khalidiyyah lead by Haji Ishaq has many followers and is also known especially among other tarekat followers in Malaysia. This article is navigating through the leadership of Haji Ishaq Bin Muhammad Arif, the emergence of tarekat Naqshabandiyyah Khalidiyyah he lead and its evolution in Malaysia. Beside the data collected through the manuscript written by Haji Ishaq, his murids works were also studied. Field observations were also performed at several sites that are identified to be the centers of the movement. Also, some senior students of Haji Ishaq were interviewed to strengthen the arguments of the manuscript data. This study had discovered that tarekat Naqshabandiyyah Khalidiyyah lead by Haji Ishaq was large group with many followers, made up of diverse backgrounds, including academicians and professionals. The power of this group is reflected in the extensive network of centers that are located in several states in Malaysia

A Methodology To Determine Product Maintainability Based On Assembly Criteria - A Case Study Of Rear Matorcycle Brake Assembly.

This paper presented a methodology to determine a maintainability index based on assembly criteria. Typically time is the major parameter or indicator being used measuring the maintainability, but less works are focus on details components assembly and assembly criteria

Integration Of Design For Modularity And Design For Assembly To Enhance Product Maintainability.

This paper discussed the relationship between design for modularity and maintenance in order to extend product life. Modularization can be described as an engineering approach to simplify component or product configuration as functional independence it creates

A Literature Review on Study of Silica fume as Partial Replacement of Cement in Concrete

In the recent past, there has been considerable attempts for improving the properties of concrete with respect to strength and durability, especially in aggressive environments. High performance concrete appears to be better choice for a strong and durable structure. A large amount of by-product or wastes such as fly-ash, copper slag, silica fume etc. are generated by industries, which causes environmental as well as health problems due to dumping and disposal. Proper introduction of silica fume in concrete improves both the mechanical and durability characteristics of the concrete. This paper present literature review on replacement of Cement by Silica Fume which includes current and future trends of research

Accuracy assessment of moderate resolution image spectroradiometer products for dust storms in semiarid environment.

Dust storms are strongly and negatively associated with the annual cycle of rainfall and coincide with the west and southwesterly winds in west and south west of Iran. Accuracy assessment of particulate matter products of moderate resolution image spectroradiometer was studied in this research. Moderate resolution image spectroradiometer products consist of aerosol optical thickness, its corresponding image red, green and blue and moderate resolution image spectroradiometer/ terra calibrated radiances 5 minutes L1B swath 1 km, which shows the environmental information at terrestrial, atmospheric and ocean phenomenology. Daily aerosol optical thickness data retrieved from moderate resolution image spectroradiometer from May 2009 to May 2010 were compared with the amount of particulate matter measured at ground in Sanandaj, Iran, using non-linear correlation coefficient. Results showed that the moderate resolution image spectroradiometer image / terra calibrated radiances 5 minutes L1B swath 1 km is able to detect dust storms distribution and their blowing direction over study area clearly. The air quality conditions obtained in with dust storm period were unhealthy and correlation coefficients between moderate resolution image spectroradiometer aerosol optical thickness and particulate matter concentration in this period were higher than without dust storm period. The moderate resolution image spectroradiometer aerosol optical thickness values lower than 0.1 were acquired uncertainty level. Comparison of moderate resolution image spectroradiometer images/ terra calibrated radiances 5 minutes L1B swath 1 km and image red, green and blue showed that moderate resolution image spectroradiometer has limitation in retrieval of aerosol optical thickness from the dust storm with high concentration of particulate matter. This study reveals that the algorithm which is applied to refine the aerosol optical thickness is not able to recognize the amount of particulate matter in low and very high concentrations sensitively. No study has previously been conducted to investigate the accuracy of the moderate resolution image spectroradiometer particulate matter products