Nanoparticle shape and thermal radiation on Marangoni Water, Ethylene Glycol and Engine Oil Based Cu, Al2O3 and SWCNTs

The aim of this paper is to investigate the relationship between particle shape and radiation effects on Marangoni boundary layer flow and heat transfer of water, ethylene glycol and engine oil based Cu, Al2O3 and SWCNTs. There are three types of nanoparticle shapes are considered in this research such as sphere, cylinder and lamina. The governing nonlinear partial differential equations are reduced into a set of nonlinear ordinary differential equations by applying similarity transformation which is solved using shooting technique in conjunction with Newton’s method and Runge Kutta algorithm. Temperature profiles are graphically and tabularly provided for the effects of solid volume fraction parameter, radiation parameter and empirical shape factor. The result shows that solid volume fraction and radiation energy gives a good impact on thermal boundary layer. Sphere nanoparticle shape predicts a better result on heat transfer rather than other nanoparticle shapes

Magnetohydrodynamic boundary layer flow in a nanofluid with various stream conditions

Magnetohydrodynamic (MI-ID) nanofluids boundary layer flow, is one of the fields of study that has caught the attention of many researchers due to the extensive applications of this flow in extrusion of plastics, the cooling of reactors, textile industry, polymer technology, metallurgy, geothermal engineering and liquid metals and plasma flows. This thesis investigates the convective heat transfer in magnetohydrodynamic boundary layer flow of nanofluids over various geometric surfaces (flat, vertical or wedge) subjected to different boundary conditions. Two models were used in this study: Tiwari-Das model that takes into account the effect of the volume fraction of nanoparticles and Buongiomo model that combines the effects of Brownian motion and termoforesis. Five problems are considered in this study taking into account the effect of various parameters such as the effect of the magnetic field, the volume fraction of nanoparticles, Brownian motion, thermophoresis, chemical reactions, thermal stratification and the presence of micro organisms and particles of carbon nanotubes (CNTs). In all cases, the mathematical models which resemble the physical flow of the problems are developed. The governing partial differential equations are reduced to a system of ordinary differential equations by using one of the following transformations: similarity transformation, local similarity transformation or local non-similarity transformation. These ordinary differential equations are then solved numerically using the shooting method for different boundary conditions. Numerical solutions for velocity, temperature and concentration profiles as well as the skin friction coefficient or local Nusselt number are obtained and presented either graphically or in tabular forms and the main features of the problems are discussed and analyzed. It is observed that the skin friction coefficient and the local Nusselt number which represents the heat transfer rate at the surface are significantly influenced by all the parameters studied. Using the Tiwari-Das model, the results indicate that increasing the volume fraction of nanoparticles increases the skin friction coefficient and the local Nusselt number. The results also showed that carbon nanotubes (CNTs) are the best particles to be dispersed in common based fluid due to its unique thermal properties and structure. Although producing the governing equations for the Tiwari-Das model is simpler than that of Buongiorno model, Tiwari-Das model ignores the velocity slip effect of nanoparticles which is important in explaining the existence of nanoparticles in the base fluid. Instead in Buongiorno model, these velocity slips are rep.resented by the Brownian motion and thermophoresis parameters. However, results showed that both of these effects only affect the temperature and concentration profiles but not the velocity flow profiles

Magnetohydrodynamic boundary layer flow in a nanofluid with various stream conditions

Magnetohydrodynamic (MI-ID) nanofluids boundary layer flow, is one of the fields of study that has caught the attention of many researchers due to the extensive applications of this flow in extrusion of plastics, the cooling of reactors, textile industry, polymer technology, metallurgy, geothermal engineering and liquid metals and plasma flows. This thesis investigates the convective heat transfer in magnetohydrodynamic boundary layer flow of nanofluids over various geometric surfaces (flat, vertical or wedge) subjected to different boundary conditions. Two models were used in this study: Tiwari-Das model that takes into account the effect of the volume fraction of nanoparticles and Buongiomo model that combines the effects of Brownian motion and termoforesis. Five problems are considered in this study taking into account the effect of various parameters such as the effect of the magnetic field, the volume fraction of nanoparticles, Brownian motion, thermophoresis, chemical reactions, thermal stratification and the presence of micro organisms and particles of carbon nanotubes (CNTs). In all cases, the mathematical models which resemble the physical flow of the problems are developed. The governing partial differential equations are reduced to a system of ordinary differential equations by using one of the following transformations: similarity transformation, local similarity transformation or local non-similarity transformation. These ordinary differential equations are then solved numerically using the shooting method for different boundary conditions. Numerical solutions for velocity, temperature and concentration profiles as well as the skin friction coefficient or local Nusselt number are obtained and presented either graphically or in tabular forms and the main features of the problems are discussed and analyzed. It is observed that the skin friction coefficient and the local Nusselt number which represents the heat transfer rate at the surface are significantly influenced by all the parameters studied. Using the Tiwari-Das model, the results indicate that increasing the volume fraction of nanoparticles increases the skin friction coefficient and the local Nusselt number. The results also showed that carbon nanotubes (CNTs) are the best particles to be dispersed in common based fluid due to its unique thermal properties and structure. Although producing the governing equations for the Tiwari-Das model is simpler than that of Buongiorno model, Tiwari-Das model ignores the velocity slip effect of nanoparticles which is important in explaining the existence of nanoparticles in the base fluid. Instead in Buongiorno model, these velocity slips are rep.resented by the Brownian motion and thermophoresis parameters. However, results showed that both of these effects only affect the temperature and concentration profiles but not the velocity flow profiles

Peranan kata pinjaman Arab dalam memperkaya bahasa Melayu sebagai bahasa negara bangsa

Suatu hakikat yang tidak dapat disangkal ialah terdapat sejumlah besar kata pinjaman Arab dalam bahasa Melayu yang digunakan secara meluas dalam masyarakat Melayu. Penggunaan kata pinjaman Arab ini meliputi pelbagai aspek; agama, ekonomi, politik, undang-undang, perubatan dan sosial.Penerimaan masyarakat Melayu terhadap kata pinjaman Arab adalah positif sehingga dapat mengayakan bahasa Melayu itu sendiri. Justeru, kajian ini melihat sejauh manakah kata pinjaman Arab ini berperanan memperkaya bahasa Melayu dari pelbagai aspek yang mampu memperkukuh fungsi bahasa Melayu sebagai bahasa ilmu dan bahasa budaya tinggi. Seterusnya kajian ini menganalisis peranan kata pinjaman Arab tersebut berlandaskan aspek yang ditentukan. Untuk tujuan itu, sejumlah perkataan pinjaman Arab yang terdapat dalam Kamus Dewan Edisi Ke-4 (KDEK4) dijadikan subjek kajian. Kata pinjaman Arab tersebut akan dikategorikan mengikut aspek yang dikemukakan oleh para sarjana bahasa. Hasil daripada penelitian yang dilakukan mendapati bahawa pengaruh dan kesan kata pinjaman Arab terhadap bahasa Melayu dilihat akan tetap dan terus berlaku hingga sekarang terutama sekali dalam bidang agama, perundangan, ekonomi dan hukum-hakam Islam. Hal ini adalah penting untuk membolehkan bahasa Melayu ini bergerak maju seiring dengan kemajuan yang dilalui oleh masyarakat penuturnya yang mampu menjadikan bahasa Melayu sebagai bahasa Negara Bangsa

A retrospective study of feline lower urinary tract disease at University Veterinary Hospital, Universiti Putra Malaysia

Being one of the most commonly presented diseases in University Veterinary Hospital, the study of the common criteria that predispose a cat to feline lower urinary tract disease (FLUTD) is essential. Although there were two retrospective studies carried out previously at the University Veterinary Hospital on FLUTD, this study however had a value-added aspect whereby the common urinalysis findings of those affected cats were studied. Additionally, comparisons of the common predisposing criteria between this study and the previous studies were also done. In this study, medical records of FLUTD cases presented to University Veterinary Hospital, UPM from 2005 to 2008 were selected. The collected data were analysed using descriptive analysis. From this study, there was no specific trend of the occurrence of FLUTD. As the cases were tabulated according to their months of occurrence there was no specific trend as well. Intact male cats had the highest percentage being affected. Domestic Short Hair and indoor lifestyle cats were the most commonly affected. Middle-aged cats with ideal body weight commonly succumbed to the disease. Basically, most of the presented cats were fed with commercial dry food. Stranguria/dysuria was the most commonly observed clinical signs suggestive of obstructed FLUTD. As for the urinalysis findings, most cats had abnormal urine colour, neutral urine pH, 4+ RBC and 2+ WBC. The most commonly observed crystal was triple phosphate followed by amorphous urates and calcium oxalate. With this knowledge, the owners should be well informed whether their cats are at risk of getting FLUTD or not

An Error Analysis in the Use of Past Tense in Writing Recount Text at the Second Year Students of SMP Unismuh Makassar

This research aimed to identify the kinds of error in the use of Past Tense in writing recount text and the dominant error made by the Second Year Students of SMP Unismuh Makassar. This research is Case Study Research. The research was conducted in SMP Unismuh Makassar. The population was the Second Year Students in Academic Year 2013-2014. The researcher took Class B1 which consists of 19 students.The instrument used was writing test. Writing test was used to find out the kinds of errors made by the students in writing recount text. By using this instrument, the researcher analyzed detail information about the errors in the use of Past Tense in writing recount text. The students' errors were classified into four categories based on the kinds of error. Those are the error of omition with 12 errors, error of addition with 31 errors, error of misformation with 166 errors, and error of misordering with 5 errors. The students made the dominant error in misformation category. It can be seen from the percentage result where misformation were 77,57%, then followed error of addition were 14,48%, error of omition was 5,61%, and misordering were only 2,34%. Based on these findings, it can be concluded that the Second Year Students(Class B1) of SMP Unismuh Makassar had many errors in writing recount text. The students should be given intensive exercises in the use of Past Tense in writing recount text. It is quite necessary for the Second Year Students and the English Teacher of SMP Unismuh Makassar to be informed about the result of this research, so they can improve their teaching learning process

Dielectric characterization of ethanol and sugar aqueous solutions for potential halal authentication

A potential method for detection and discrimination of alcoholic containing drinks for halal authentication using dielectric properties has been investigated. Behaviors of several concentrations of ethanol solutions in water were studied for verification purpose. The addition of three types of sugar namely sucrose, glucose and fructose show the effect and changes to dielectric properties of solutions. Dielectric constant and dielectric loss factor for each samples were measured over the microwave frequency from 0.5 to 50 GHz. The results showed that dielectric properties manage to discriminate alcohol content until the lowest concentration studied of 0.5% in water mixture. Beyond this limit, solution is considered as alcoholic drinks

Factors affecting dielectrophoretic separation of cells using high gradient electric field strength system

An investigation on dielectrophoretic separation of cells has been conducted using high-gradient electric field system (HGES). The HGES system consisted of two concentric cylindrical electrodes whereby the space between them was filled with glass beads. The glass beads were found to distort the electric field generated between the two electrodes and thus creating a high field gradient sites that produce dielectrophoretic force for cells collection. In order to study the effectiveness of the system in separating the cells, a series of experiments have been conducted. Here, yeast cells were introduced into the system and the number of cells collected was measured. The effects of voltage, flow rate, type of matrix, height of matrix and sample concentration have been investigated. In addition, the electric field analysis for the HGES has also been carried out using FEMLAB. Results show that the cells collection is influenced by the effect at the condition with and without electric field. Further analysis on the investigating factors enabled one to predict optimum values for voltage, flow rate, type of matrix, and height of matrix and sample concentration in order to improve the efficiency of the system by reducing the effect when no field is applied

Pengaruh Pembelajaran Blended Learning Model Flipped Classroom Terhadap Kemampuan Berpikir Kritis Siswa SMA dalam Belajar Biologi

THE EFFECT OF LEARNING BLENDED LEARNING BY FLIPPED CLASSROOM  MODEL ON THE STUDENTS’ CRITICAL THINKING SKILLS  FOR SENIOR HIGH SCHOOL IN BIOLOGY LEARNING   RADIAH   ABSTRACT                  The study was aimed at finding out the effect of Learning Cycle Blended Learning by Flipped Classroom model on the students’ critical thinking skills for senior high school in Biology Learning. This study was a quasi-experimental using the factorial design involving 60 students of the Senior High School 8. The result show that  the students’ critical thinking skills of the group of students who learned through the Blended Learning that Flipped Classroom model is 70,917, than that of those who learned through conventional learning model    Keywords:    Blended Learning, Flipped Classroom, Critical thinking                             PENGARUH PEMBELAJARAN BLENDED LEARNING MODEL FLIPPED CLASSROOM TERHADAP KEMAMPUAN BERPIKIR KRITIS  SISWA SMA DALAM BELAJAR BIOLOGI   RADIAH ABSTRAK        Penelitian ini bertujuan untuk mengetahui pengaruh pembelajaran Blended Learning model Flipped Classroom terhadap kemampuan berpikir kritis siswa. Penelitian ini merupakan penelitian kuasi-eksperimental dengan menggunakan rancangan faktorial yang melibatkan 60 siswa SMAN 8 Malinau sebagai sampel. Hasil penelitian menunjukkan bahwa kemampuan berpikir kritis siswa yang mengikuti pembelajaran Blended Learning model Flipped Classroom lebih tinggi yakni 70,917 daripada yang mengikuti model konvensional yaitu hanya 64,383    Keywords:     Pembelajaran Blended Learning, Flipped Classroom,  Berpikir Kritis   &nbsp