EVALUASI E-LEARNING IDEA PADA S1 TEKNIK INFORMATIKA TELKOM UNIVERSITY MENGGUNAKAN TECHNOLOGY ACCEPTANCE MODEL (TAM)

Pesatnya kemajuan teknologi informasi memberi pengaruh pada perkembangan dibidang pendidikan salah satunya yaitu penerapan e-learning. e-learning menjadi penting pada perguruan tinggi saat ini dikarenakan e-learning dapat mempermudah akses seorang mahasiswa dalam berinteraksi dengan kampusnya. Selain itu e-learning akan meningkatkan daya saing perguruan tinggi tersebut. Untuk mengoptimalkan sistem e-learning, maka harus dilakukan penelitian dengan cara mengevaluasi penggunaan sistem dari e-learning tersebut. Penelitian ini bertujuan untuk mengevaluasi penggunaan sistem e-learning IDEA Telkom University dengan menggunakan metode Technology Acceptance Model yang diperkenalkan oleh Davis, dan untuk mengolah data survei tersebut menggunakan software Partial Least Square (PLS) untuk mengukur persepsi pengguna terhadap e-learning IDEA Telkom University apakah berjalan sesuai fungsinya. Data yang diperoleh merupakan data primer dengan menggunakan kuisioner kepada pengguna IDEA Telkom University yang menggunakan e-learning ini. Variabel-variabel yang digunakan adalah persepsi kemudahan penggunaan, persepsi kegunaan, sikap menggunakan teknologi, minat menggunakan teknologi, dan penggunaan teknologi sesungguhnya. Hasil survei menunjukkan bahwa pengguna IDEA belum sepenuhnya digunakan atau memanfaatkan e-learning ini sebagai media pembelajaran online. Faktor yang menghambat adalah faktor kegunaan, pengguna belum benar-benar merasakan atau memanfaatkan e-learning ini secara maksimal. Karena kegunaan dan sikap juga dipengaruhi secara langsung oleh kemudahan penggunaan maka perlu diadakan rekomendasi terhadap kemudahan-kemudahan dalam penggunaannya Kata kunci: e-learning, IDEA Telkom University, Technology Acceptance Mode

Electronic and optical properties of lead iodide

ABSTRACT: Lead iodide (PbI2) is a very important material with a technological applicability as a room-temperature radiation detector. It is a wide-band-gap semiconductor (Eg.2 eV) with high environmental stability efficiency. The performance of the detector cannot be fully understood unless its electronic and optical properties are determined. Recently, its band-gap energy and thermal properties were determined by photoacoustic spectroscopy. A single crystal of PbI2 was grown by the Bridgman method with the c-axis oriented perpendicular to the growth axis. The purpose of this work is to obtain the electronic structure of PbI2, its dielectric functions e 1 and e 2 by ellipsometry and theoretically by full-potential linear muffin-tinorbital ~FPLMTO! method, and the temperature dependence of the measured band-gap energy by optica absorption. The obtained Eg(T) can be fitted by two different methods, leading to Eg ~0 K! and Eg ~300 K!

Influence of residual stresses on thermo-mechanical fatigue in turbine housings

This poster presents the results of a neutron investigation of the residual stresses generated during the production of the turbine housing component of a turbocharger with the aim of improving simulation methodologies to predict the locations of thermal fatigue and fracture locations and hence improve the performance of the turbochargers. Initial strain measurements were made on ENGIN-X (Rutherford Appleton Laboratory, UK) on three turbine housings selected from various stages in the manufacturing process. Measurements were made on a region of the housing where failures (cracks) have been recorded after accelerated durability tests, although these have never been predicted by FEA. Measurements were also made using SALSA (ILL, France) on two turbine housings, one as cast and one heat treated. In this experiment the internal divider wall was examined in detail as this is an area where crack initiation can occur during operation. Our results show that heat treatment can reduce compressive residual stresses. However, as compressive stresses are thought to slow the onset of crack initiation and could be beneficial in the material, questions about the efficacy of current production methods have now been raised. These results will be compared with the results of FEA simulations, and suggestions for modifying the simulation methodology and/or production route will be discussed. The authors wish to thank Dr Jon James (Open University) for his help in setting up the ENGIN-X experiment and for the use of the SScanSS software

Evidências Empíricas de Modelos de Estimação do Custo do Capital Próprio

This article investigates whether there are statistically significant differences among the costs of equity capital of Brazilian companies estimated by four models and their variants: Gordon, CAPM, APM and Ohlson-Juettner. We used a cross-section of 34 companies that were part of the São Paulo Stock Exchange Index (IBOVESPA) on December 29, 2005. The results do not permit saying that the choice of model makes no difference in estimating the cost of equity capital, so the methodology hypothesis was rejected. The models based on profit and dividend projections, notably the OJ and Gordon models, resulted in equivalent mean values and also were those that most resemble each other. The OJ model appears to be theoretically superior to the Gordon and Gordon & Gordon models, given that it was developed with fewer premises and in a more analytic manner.Este artigo investiga se existem diferenças estatisticamente significantes entre os valores estimados para o custo de capital próprio de empresas brasileiras através de 4 modelos e suas variantes: Gordon, CAPM, APM e Ohlson-Juettner. Para isso, foi utilizada uma amostra em cross-section de 34 empresas que fizeram parte do Ibovespa em 29/12/2005. Os resultados encontrados não permitem dizer que a escolha do modelo é indiferente com relação ao resultado da estimação do custo de capital próprio, com isso, a hipótese metodológica foi rejeitada. Com relação aos modelos, os baseados em projeções de lucros e dividendos, notadamente os modelos OJ e de Gordon, resultam em valores médios equivalentes entre si e fora os que mais se igualaram em relação aos outros. Finalmente, é importante comentar a superioridade teórica do modelo OJ, dado que este é desenvolvido com um menor número de premissas e de maneira analítica, com relação ao modelo de Gordon e ao modelo de Gordon & Gordon

Antenatal magnesium individual participant data international collaboration: assessing the benefits for babies using the best level of evidence (AMICABLE)

BACKGROUND: The primary aim of this study is to assess, using individual participant data (IPD) meta-analysis, the effects of administration of antenatal magnesium sulphate given to women at risk of preterm birth on important clinical outcomes for their child such as death and neurosensory disability. The secondary aim is to determine whether treatment effects differ depending on important pre-specified participant and treatment characteristics, such as reasons at risk of preterm birth, gestational age, or type, dose and mode of administration of magnesium sulphate. METHODS: Design: The Antenatal Magnesium Individual Participant Data (IPD) International Collaboration: assessing the benefits for babies using the best level of evidence (AMICABLE) Group will perform an IPD meta-analysis to answer these important clinical questions. Setting/Timeline: The AMICABLE Group was formed in 2009 with data collection commencing late 2010. Inclusion Criteria: Five trials involving a total 6,145 babies are eligible for inclusion in the IPD meta-analysis. Primary study outcomes: For the infants/children: Death or cerebral palsy. For the women: Any severe maternal outcome potentially related to treatment (death, respiratory arrest or cardiac arrest). DISUCSSION: Results are expected to be publicly available in 2012.C.A. Crowther, P.F. Middleton, L.M. Askie, L.W. Doyle, T.K. Bubner and M. Voyse

Measurement of residual stresses in the turbine housings of turbochargers

Emission regulations in Europe are extremely stringent and only turbocharged and charged-air-cooled engines are able to comply with current requirements. To meet these performance, durability and legislative conditions, a turbine housing must be capable of operating in harsh environments where vibration is always present and exhaust temperatures can reach 800°C, however many turbine housings are at the limits of operation with regard to strength and durability under these conditions, and failures are recorded on accelerated durability tests. It is now of great importance to understand the fatigue performance of these components and the conditions that determine this performance. In this experiment residual stress measurements will be made of three turbine housings in areas where cracks are commonly observed. We estimate that 4 days of beam time will be required

ANALISIS DAN PERANCANGAN SISTEM PENJUALAN LUKISAN BERBASIS WEB

ANALISIS DAN PERANCANGAN SISTEM PENJUALAN LUKISAN BERBASIS WEB