12 research outputs found
Dampak Penggantian Fe3O4 secara Parsial dengan Abu Sekam Padi (ASP) terhadap Porositas dan Kuat Tekan Keramik Komposit Clay-Fe3O4
No full textBerdasarkan kajian pendahuluan diketahui bahwa penggunaan pasir laut dan penggantiannya dengan abu sekam padi (ASP) hingga pada fraksi berat tertentu dalam pembentukan keramik komposit clay belum mampu menunjukkan kuat tekan seperti yang diinginkan. Ditambah lagi karena kandungan Cl-dan SO4- yang bersifat korosif, penggunaan pasir laut tersebut tidak lagi direkomendasikan. Mineral utama dari pasir besi yaitu Fe3O4selanjutnya diajukan sebagai penggantinya untuk memproduksi keramik komposit clay baru. Karena pasir besi merupakan sumber daya alam yang tidak dapat diperbaharui, maka penggunaan mineral Fe3O4 tersebut perlu dibatasi. Selanjutnya, ASP masih dipilih untuk menggantikan Fe3O4secara parsial demi keberlanjutan produksi dari material-material keramik tersebut. Keramik dari komposit clay-Fe3O4/ASP tersebut selanjutnya diperkenalkan dalam makalah ini dan nantinya dirancang sebagai material bagi komponen-komponen yang menerima pembebanan berupa tekan dan juga termal. Dua tipe ASPlalu disiapkan dan selanjutnya dikarakterisasimenggunakan spektrometer X-ray fluorescence (XRF). Tidak terdapat perbedaan yang signifikan pada komposisi kimia dari keduanya. Namun, keduanya memiliki bulk density yang berbeda. Hasil pengujian porositas terhadap material keramik komposit tersebut menunjukkan bahwa penggantian Fe3O4dengan ASP meningkatkan porositas material. Hasilpengujian tekan menunjukkan bahwa meningkatnya berat fraksi dari ASP diikuti oleh penurunan kuat tekan material. Analisis X-ray diffraction (XRD) terhadap material baru tersebut menunjukkan bahwa sebagian besar dari Fe3O4 telah bertransformasi menjadi Fe2O3 dan transformasi tersebut selanjutnya dapat menentukan besarnya porositas dan juga kuat tekan dari material tersebut
Complex Eigenvalue Analysis of A Motorcycle Disc Brake Squeal
No full textThis paper discusses the phenomenon of brake squeal of a disc brake system used at motorcycle with a capacity of 125 cc. The occurrence of disc brake squeal is associated with the dynamic instability of the system with the influence coefficient of friction. The dynamic instability of the system is predicted using finite element complex eigenvalue analysis. The analysis predicted three unstable modes in the frequency range below 5 kHz. The unstable modes occurred at the frequency of 1250 Hz, 1920 Hz, and 2306 Hz. The occurrence of unstable mode is indicated by the presence of positive real part of the corresponding complex eigenvalue. Unstable mode is shown by the occurrence of coupled vibration between eigenvectors of disc and brake pads vibrating at similar frequency which consists of diametral mode of disc and bending modes of pads. The analysis also showed that the unstable condition could occur at a value of coefficient of friction as low as 0.2
Pengaruh Penghambatan Kebeningan Kaca Terhadap Kemampuan Transfer Intensitas Cahaya Pada Kaca
No full textThe sun is the primary source of energy on the earth, but its light sometimes cause thermal discomfort for humans. The thermal engineering started one in the automotive sector in particular car is to install the air conditioner to lower the temperature of the cabin and use the tranfer window film to block sun light intensity. Testing the proper use of window film to determine the effect of inhibition of the ability to transfer the glass clarity of light intensity on the glass needs to be done to determine what percentage inhibition that has the intensity and the lower the cabin temperature, so the thermal comfort is achieved faster. From the results of the testing were conditioned using Solar ray Collector PHYWE Systeme GmbH CO.KG. Inhibition obtained with 40% glass has an intensity of 39% and a temperature of 63.20 C, the glass has an intensity of 60% inhibition of 21% and a temperature of 61.90 C, the glass has an intensity of 80% inhibition of 8% and a temperature of 63.80 C. So the use of glass with 60% inhibition is best to accelerate the thermal comfort is achieved
ANALISIS PENGENDALIAN PERSEDIAAN BAHAN KEMAS DI PT PETROKIMIA GRESIK DENGAN PENJADWALAN LOT PENGIRIMAN MENGGUNAKAN TEKNIK LOT SIZING
No full textJika membutuhkan abstrak atau isi jurnal silahkan menghubungi author melalui e-mail [email protected], [email protected]
Astrology in literature: how the prohibited became permissible in the Arabic poetry of the mediaeval period
No full textThis thesis is concerned to position the art of astrology within the context of classical Arabic poetry, primarily by investigating and elucidating attitudes to the notion of
qadar (fate) and the ideology in which it was embedded. These attitudes were revelatory of the broader world view of the Arabs of those periods, and their shifts from those held in the pre-Islamic and early Islamic eras tell us a good deal about the importance given to the nature and role of fate and about the various understandings of its influence. The pre-Islamic Arab's notion of qadar was in some ways similar to that of the early Muslims: both emphasised predetermination and the irresistible power of fate. But while the jahilf (Pre-Islamic) Arabs identified fate with the malign power of dahr (Time), the Muslims believed the power of fate lies in the hands of God the
Omnipotent, who alone is responsible for the fate of the whole universe. Thus the astrology of the pre-Islamic era was one aspect of divination (kihana) and claimed to be
able to reveal in advance an individual's destiny, which could be avoided by taking certain precautions. These precautions, however, were considered effective only in
relatively trivial cases; they were useless in the areas of major impact: a person's happiness or misery (shaqiiwa aw sa ada), sustenance (rizq) and one's term (ajal), the
three inevitable and irresistible manifestations of fate. In the Islamic period not only these major aspects of life are governed and controlled by the Omnipotent; the destiny
of the universe, in even its most minute details, is determined and controlled by God alone. Astrology was considered to be of no value whatsoever, and its practitioners were subject to the death penalty. These two irreconcilable views are evident in early Islamic poetry, which reflected clearly the response of poets, and society, to astrology from the perspective of qadar.
When the orthodox caliphate was replaced by dynastic rule the status of astrology was changed dramatically. The idea that the stars, as indicators, play a role in the life of
human beings found popowerful supporters in some governors of the Islamic world, who allowed astrology to fulfil a public function regardless of the hostility of the official
religion of that society. This social phenomenon generated rich material of a controversial character in the realm of literature. Investigating the factors, motivations
and impact of mediaeval political, theological and philosophical attitudes to astrology, in relation to the notions of free will and predestination, is the concern of this study
Regulating Energy between Main Supply and Solar Energy Using Power Electronics Devices
No full textThe project title is Regulating Energy between Main Supply and Solar Energy
Using PowerElectronics Devices. The aim is to design a regulating system between main
supply and solar energy using power electronic devices. The study explored the
implementation of several type of power electronics circuits such as rectifier circuit, filter
circuit, regulator circuit and switching circuit.
In the project process, Multisim2001 have been used as the simulation tools.
Simulation process is a very important in order to test the operationof circuits and also to
integrate between circuits.
Ultiboard is another software that isused inthisproject. The software used to
convert simulated circuit into PCB circuit. The process of conversion into PCB is done in
the lab.
For this project, the author has successfully produced the prototype for 15 V. The
prototype has been tested and it works well. Besides, simulations for a circuit that can
withstand 240 V also have been successfully simulated
Aplikasi Penjadwalan Dan Monitoring Pelaksanaan Kuliah Menggunakan Algoritma Genetik Berbasis Mobile App
No full textAplikasi Penjadwalan dan Monitoring Pelaksanaan Kuliah menggunakan Algoritma Genetika Berbasis Mobile App adalah proyek yang bertujuan menerapkan algoritma genetika untuk otomatisasi penjadwalan kuliah. Pada Departemen Teknik Komputer proses penjadwalan masih dilakukan secara konvensional. Di tahun sebelumnya terdapat proyek tugas akhir tentang pembuatan algoritma genetika sebagai penjadwalan perkuliahan otomatis di Departemen Teknik Komputer, namun hasil akhir dari algoritma tersebut masih memiliki output antara dosen dan mata kuliah yang dirandomisasi oleh algoritma genetika, hal ini menyebabkan hasil penjadwalan dari algoritma genetika tidak dapat digunakan. Pada penelitian kali ini penulis memiliki tujuan untuk memperbaiki algoritma tersebut sekaligus membuat aplikasi sebagai platform untuk melakukan visualisasi hasil penjadwalan dan juga memiliki fitur untuk melakukan monitoring kelas.
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"Mobile app-based class scheduling and monitoring application with genetic algorithm" is a project aimed at applying genetic algorithms for automated lecture scheduling. In the Department of Computer Engineering, the scheduling process is still done conventionally. In the previous year, there was a final project about creating a genetic algorithm for automated lecture scheduling in the Department of Computer Engineering, but the final result of the algorithm still had the output for lecturers and the courses to be randomized, resulting in suboptimal scheduling outcomes. In this research, the author aims to improve the algorithm while also creating an application as a platform to visualize the scheduling results and feature class monitoring
Impact of quality of improvement in operation management towards customerss satisfaction and company's performance
No full textAbstract. In every year, demand of automotives industry always increase, which will impact into the number of accident. This could be the opportunities for body repair industry. The demand of products/services in body repair company was really high, on the other hand, there is low level of competitor in the body repair market. To take this opportunities, every company that want to survive in the market need to provide something different. Hanjaya Motor is an automotive industry that focus on customers’ satisfaction and quality product. Hanjaya provide high level of quality with an affordable price in the market. However there are several problem such as quality control, low level of employees’ performance and defect product in the Hanjaya’s production which will be obstacles in the business to taking the opportunities in the market. In this research, Author discuss about evaluating Hanjaya’s performance starting from evaluatin the market situation by conduct Porter 5 Forces, understand which factors that have have been influenced in compayn performance by Macro Micro Environment, understand the Hanjaya’s company by SWOT Analysis, continue to observe the target market of the company by using STPD Theory, understand the operation process by using Six-Sigma Theory and DMAIC Framework. Which leads Author to evaluate the quality of company by using Quality Control and Cost of Quality Theory. And the last step is find and solve the core problem of the company by using Fishbone framework. The result of this research is there are 3 main problem in Hanjaya, which is Quality Control, Employees’ performance, and Defect products. Lacks of quality control affect the company to for having low level of competitors that will leads the production fail and producting defect products. In order to solve the problem, Hanjaya need to increase the quality control by providing more inspection division that act like monitoring and controlling in body repair process
Author Correction: Prediction of gestational age using urinary metabolites in term and preterm pregnancies
No full textAuthor Correction to "Prediction of gestational age using urinary metabolites in term and preterm pregnancies
Analysis of Intervening Variables of New Product Performance affected by Tacit Knowledge and Strategic Flexibility
No full textObjectives: Global Innovation Index revealed that the innovation performance of Indonesia is relatively poor compared to several ASEAN countries. The lowest indicator of innovation performance is related to business sophistication. In business activities, some experts identify innovation as the key factor in company competitiveness. The author plans to analyze product innovation, innovation processes, and organizational innovations as intervening variables.Methodology: This study is causal research with a 95% confidence interval in collecting and constructing data structures to evaluate the cause-and-effect relationship of the variables. The primary data was obtained through a survey of 90 small-scale leather apparel companies in Indonesia. Subsequently, the data was analyzed using a structural equation model and multiple.Finding: Compared to the previous studies, the results of this study indicated a novelty, product innovation, and process innovation can be intervening variables if there is strategic flexibility as exogenous variables and new product performance. To improve new product performance, every leather apparel industry in Indonesia must first increase tacit knowledge, strategic flexibility, product innovation, and process innovation.Conclusion: Based on the findings, the researcher suggests further research to examine the path analysis research framework are exogenous variables (strategic flexibility and tacit knowledge), endogenous variables (organizational innovation and new product performance), and intervening variables (product innovation and process innovation)
