1,721,022 research outputs found
Leucaena Leucocephala : a new green biocomposite substrates for wireless applications / Ahmad Azlan Ab Aziz
Get PDFThe green biocomposite antenna substrate serves as an alternative material for microwave applications. The mixture between polypropylene as a laminator and sawdust as a filler from Leucaena leucocephala stem tree offered six different substrate compositions which were labelled as PP100, PB9010, PB8020, UPB7030 (untreated), PB7030 (treated), and PB6040. These substrates were fabricated with three types of antenna design that used the single patch, off centre feed array antenna (OCFA), and Balance to unbalance (BALUN) control feed antenna (BCFA) in comparison to the FR4 substrate. In the process of substrate identification, the substrate sensor was developed to recognise the mixture type using light visibility sensor. This circuit was produced to help users identify the substrate even if the substrate information sticker on the substrate was wiped out. The process of fabrication applied the compounding moulded flat pressed method, and this method consisted of hot pressed (melting process) and cold pressed (preservation) machines which followed the American standard test and measurement (ASTM) procedure. Every fabricated material has unique dielectric properties and characteristic which give the big impact in antenna design. The analysis of the biocomposite substrate in terms of dielectric constant (Dk), Loss tangent (Tan δ), thermal properties, electrical strength analysis, and mechanical strength properties was conducted to update the CST antenna simulation software new material database. The measurement of dielectric constant for PP100 (1.9), PB9010 (2.27), PB8020 (2.63), UPB7030 (3.05), PB7030 (3.1), and PB6040 (3.49) indicated that the value increased as the wood filler content increased. This condition occurred since the natural carbon inside the wood filler increased parallel with the increasing of wood filler compositions. Besides dielectric properties, the analysis of thermal properties, and electrical and mechanical strength analyses indicated that the parameter value decayed with the increase of the wood filler content. This situation occurred due to the porosity between the polypropylene and sawdust particle. Since there was no additive to hold the sawdust filler interlocking, the elimination relied only on polypropylene, which was the reason why the composition of polypropylene must exceed the sawdust filler, and decayed the measurement value. The antenna design that used a UPB7030 substrate with three by three OCFA orientation gave a great performance with the gain measured at 7.98 dBi and directivity at 12 dBi. The comparative study on other substrates was performed using the BCFA structure with the measured gain results indicated by PP100 (4.77dBi), PB9010 (4.62dBi), PB8020 (4.0 dBi), PB7030 (0.9dBi), and PB6040 (0.1dBi). The decay of the gain occurred due to the increment of dielectric loss ranging from 0.0053 to 0.0781 from the PP100 to the PB6040 substrate. In this BCFA design analysis, the physical substrate dimension was maintained while the control resonant frequency was only adjusted through the quarter wave radiator and Balun for matching section. The proposed green biocomposite antenna substrate not only gives six different dielectric characteristics but now also serves as a transmitting antenna to cover the dean's meeting room access point (AP) in the Electrical Faculty in Universiti Teknologi MARA (UiTM
Sistem pembinaan struktur konkrit bertetulang untuk rasuk dan tiang / Ahmad Azlan Adnan
Get PDFEnsidesa Sdn Bhd telah diperbadankan pada Ogos 1998 untuk turut serta menyumbangkan kepada program pembangunan negara terutamanya dalam sektor pembinaan yang pesat berkembang. Dengan mengamalkan falsafah pengurusan yang berkesan dan praktikal di setiap peringkat kakitangannya, dari tahun ke tahun Ensidesa mula mendapat keyakinan dan kepercayaan dari setiap pelanggannya
Dynamics and control of underactuated systems with applications in robotics / Ahmad Azlan Mat Isa … [et al.]
No full textUnderactuated systems are mechanical control systems with fewer controls than the number of configuration variables. Control of underactuated systems is currently an active field of research due to their broad applications in Robotics, Aerospace Vehicles, and Marine Vehicles. The goal to study is to develop a model and control methods for underactauted systems. Although an underactuated manipulator can be structurally identical to a fully actuated one, their dexterities differ because of the presence of unactuated joints. If all underactuated systems in a class can be transformed into a specific class of nonlinear systems, we refer to Artificial Neural Network (ANN) systems as the "normal form" of the corresponding class of underactuated systems. An adaptive learning algorithm using an artificial neural network ANN has been utilized to predict the passive joint position of underactuated robot manipulator. In this approach a network has been trained to learn a desired set of joint angular positions from a given set of input torque and velocity over a certain period of time. Trying to overcome disadvantages of many used techniques in the literature, the ANNs have a significant advantage of being model-free method. The robot can directly determine the position of its passive joint, and can, therefore, completely eliminate the need for any system modeling. Even though it is very difficult in practice, data used in this study were recorded experimentally from sensors fixed on robot's joints to overcome the effect of kinematics uncertainties presence in the real world such as ill-defined linkage parameters and backlashes in gear trains. An ANN modal was trained using the experimentally obtained data and then used to predict the path of the passive joint that is positioned by the dynamic coupling of the active joint. The generality and efficiency of the proposed algorithm are demonstrated through simulations of an under-actuated robot manipulator, finally the obtained results were verified experimentally
CFD and wind tunnel testing for a rear car spoiler / Ahmad Azlan Asri
Get PDFIn the way of designing a car, the aerodynamic must taken into consideration so that the car performance and stability will be satisfied and the fuel consumption can be reduced. To achieve this goal, one of the ways is the rear spoilers have to install at the rear end of car. The spoiler can create down force to allow the car grip on the road for better car stability. However, the position of the spoiler also have to chosen correctly to make the car aerodynamic acceptable. So, this study focused on the effect of rear spoiler on the sedan car in terms of drag coefficient and lowering fuel consumption. The method employed for this analysis by using Computational Fluid Dynamics (CFD) software and UiTM Low-Speed Wind Tunnel. The 1/17 scale of car prototype is drawing by using CATIA V5R18. Three variable data were tested such as velocity (v), height of spoiler (h), and angle of attack (a). The car then will simulated without using rear spoiler to compare the effect. Drag Coefficient (Cd) and Lift Coefficient (CI) were determined during simulation and experimental progress. The result will be investigated by applying the Fluid Mechanics relations to understand the situation. From the results, the comparison will be made either to choose the car without rear spoiler or a car with rear spoiler. After that, the best rear spoiler which can give less drag and fine down force was chosen. For the expected result, the scale car without rear spoiler will give large drag compared the car with rear spoiler. Then, the lower height and negative angle of attack is will generate more drag. The data that give the less drag was considered as achieved the objective of this project which is to reduce fuel consumptio
Leucaena Leucocephala : A new green biocomposite substrates for wireless applications / Ahmad Azlan Ab Aziz
No full textThe green biocomposite antenna substrate serves as an alternative material for microwave applications. The mixture between polypropylene as a laminator and sawdust as a filler from Leucaena leucocephala stem tree offered six different substrate compositions which were labelled as PP100, PB9010, PB8020, UPB7030 (untreated), PB7030 (treated), and PB6040. These substrates were fabricated with three types of antenna design that used the single patch, off centre feed array antenna (OCFA), and Balance to unbalance (BALUN) control feed antenna (BCFA) in comparison to the FR4 substrate. In the process of substrate identification, the substrate sensor was developed to recognise the mixture type using light visibility sensor. This circuit was produced to help users identify the substrate even if the substrate information sticker on the substrate was wiped out. The process of fabrication applied the compounding moulded flat pressed method, and this method consisted of hot pressed (melting process) and cold pressed (preservation) machines which followed the American standard test and measurement (ASTM) procedure. Every fabricated material has unique dielectric properties and characteristic which give the big impact in antenna design. The analysis of the biocomposite substrate in terms of dielectric constant (Dk), Loss tangent (Tan δ), thermal properties, electrical strength analysis, and mechanical strength properties was conducted to update the CST antenna simulation software new material database. The measurement of dielectric constant for PP100 (1.9), PB9010 (2.27), PB8020 (2.63), UPB7030 (3.05), PB7030 (3.1), and PB6040 (3.49) indicated that the value increased as the wood filler content increased. This condition occurred since the natural carbon inside the wood filler increased parallel with the increasing of wood filler compositions. Besides dielectric properties, the analysis of thermal properties, and electrical and mechanical strength analyses indicated that the parameter value decayed with the increase of the wood filler content. This situation occurred due to the porosity between the polypropylene and sawdust particle. Since there was no additive to hold the sawdust filler interlocking, the elimination relied only on polypropylene, which was the reason why the composition of polypropylene must exceed the sawdust filler, and decayed the measurement value. The antenna design that used a UPB7030 substrate with three by three OCFA orientation gave a great performance with the gain measured at 7.98 dBi and directivity at 12 dBi. The comparative study on other substrates was performed using the BCFA structure with the measured gain results indicated by PP100 (4.77dBi), PB9010 (4.62dBi), PB8020 (4.0 dBi), PB7030 (0.9dBi), and PB6040 (0.1dBi). The decay of the gain occurred due to the increment of dielectric loss ranging from 0.0053 to 0.0781 from the PP100 to the PB6040 substrate. In this BCFA design analysis, the physical substrate dimension was maintained while the control resonant frequency was only adjusted through the quarter wave radiator and Balun for matching section. The proposed green biocomposite antenna substrate not only gives six different dielectric characteristics but now also serves as a transmitting antenna to cover the dean’s meeting room access point (AP) in the Electrical Faculty in Universiti Teknologi MARA (UiTM
Hubungan pemasaran dan kutipan box-office, satu kajian filem: Ombak Rindu / Ahmad Azlan Syah Abd Rashid
Get PDFIndustri perfileman Malaysia kini pesat membangun namun hala tuju ataupun nasib industri tempatan ini pada masa yang akan datang masih samar. Ini kerana pola penontonan filem cereka di panggung kini kian tidak menentu. Para penerbit filem tempatan kini kerap menunding jari ke atas para penonton kononnya para penonton lebih berkiblatkan filem-filem Hollywood. Badan kerajaan seperti FINAS (Perbadanan Kemajuan Filem Nasional) juga kerap dipersalahkan kononnya tidak mengawal kemasukan filem-filem barat tersebut yang sekaligus menjejaskan pasaran tempatan sedangkan FINAS banyak membantu industri tempatan tanpa mereka sedar. Masalah utama para penerbit filem tempatan kini adalah kurangnya ilmu pengetahuan terhadap dunia pemasaran yang sebenar. Tesis ini mengupas satu sistem pemasaran filem yang sistematik bagi rujukan para penerbit di masa yang akan datang. Konsep pemasaran filem yang relevan perlu bagi menepati kehendak para penonton yang sentiasa berubah-berubah mengikut peredaran zaman. Oleh itu kajian ini merungkai satu sistem pemasaran filem yang telah berjaya meraih kutipan box-office. Kajian ini dilakukan secara Kualitatif dan berlandaskan pada penyelidikan deskriptif. Segala data diperoleh daripada sumber utama dan sumber kedua kajian. Ianya dibuktikan satu per satu melalui perkaitan segala teori-teori yang dikaji. Hubungan pemasaran dan box-office dirungkaikan satu persatu melalui kajian kes filem yang dikaji. Satu sistem pemasaran yang sistematik terungkai mengikut peredaran zaman yang mencabar
Business plan Sweet Love Bakery / Ahmad Azlan Azizan... [et al.]
Get PDFA bakery is a place where production of breads takes place. Sweet Love Bakery aims to be the main producer and supplier of baked goods in Samarahan and the surrounding area. In order for this to have effect, high co
operation is needed between the gears of Sweet Love Bakery itself. In today's world, customers want the best out of their daily intake of foods. We found that bread is in the top tier of the universal food chain. Bread is also one of the most needed foods for daily consumption of one healthy adult. If we take a time to browse the products sold in bookstores and stalls alike, we are most likely to see an article featuring recipes on how to make baked goods. Considering the fact that people are exposed to this all the time, Sweet Love Bakery is willing to take the risk by venturing into the business of producing baked goods for the customers. Furthermore, customers are getting smarter and picky about their daily intake of food. We are willing to satisfy that needs and produce specially selected products for their everyday needs by producing first-rate dough-related products. There are criteria and conditions that have to be fulfilled which require the involvement of effort and precision of producing baked goods. Without such
conditions, the business cannot run properly and organizational goals will not be achieved. These conditions must be achieved in order for the business to take position in the first place
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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