Oleh:
Muhammad Irwansyah
IT Maintenance Manager, PT. Cikarang Listrindo, Bekasi
Alumnus, Program Magister Ilmu Komputer Universitas Bunda Mulia, Jakarta

Rila Mandala
Staf Pengajar, Program Magister Ilmu Komputer Universitas Bunda Mulia, Jakarta

This study examines SCADA system application at Gas Meter Station using GSM/GPRS Network. SCADA (Supervisoy Control and Data Acquisition) is a centralized system to monitor and control the site from remote station. The technology supporting this system is GSM (Gobal System Mobile) / GPRS (General Packet Radio Services) based. This technology uses radio wave and wireless application. GPRS is a technique in GSM transmitions that connects and uses package data for receiving and sending them.

Keywords:
SCADA, GSM, GPRS, Gas Meter Station

Oleh: M. Ishaq
Staf Pengajar Jurusan Manajemen Universitas Bunda Mulia, Chief HR Manager PT. AT MPI
Alumnus Program Magister Manajemen Universitas Bunda Mulia

One important factor, which supports organization objective, is the availability of quality employees. Employees’ motivation is a critical factor to ensure the sustainability of an organization. Management by Objective (MBO) is a system eligible to increase employee motivation. PT AT MPI, as a leader in its industry, has been implementing MBO since 2007. The purpose of this study is to explore the employees’ perception during the implementation of MBO at PT AT MPI, and how MBO affects the motivation of its employees. The result shows that the implementation of MBO has reached the employees’ mind. It is also found that there are 72,3% of other variables that could also affected the motivation in the organization.

Keywords:
MBO, perception, motivation, quality employees

Oleh: J. Supranto

The success of the government target to receive seven million tourists in 2008 will mostly depend on the external as well as the internal factors. Internal factors is for example the ability of the government to create condusive environment for the tourists like hospitality of the government officials dealing with visa, customs and other services; easy access to tourist locations and the general satisfaction among these tourists while they were staying in this country. Personal safety, with no natural disasters like tsunami, earthquake, tornado, flood and volcano eruptions. External factors comprise of travel warning issued by the foreign governments, increase of disposable income as the economy is getting improved. The government must also ensure that services rendered to these tourists from the moment they apply for visa at the Indonesian Embassy overseas till they leave Indonesia after their visits.

Keywords:
turis asing, visa, lokasi wisata, pelayanan memuaskan, visit Indonesia 2008

Oleh: Haidar M. Hussain

Haidar M. Hussain, adalah staf pengajar di Jurusan Teknik Industri, Universitas Bunda Mulia. Menerima gelar Doktor dari Universitas Gadjah Mada pada tahun 2005. Bidang peminatan: Quantitative Methods, Industrial Chemistry.

Penelitian ini meembahas tentang pemanfaatan tenaga surya untuk pemanas udara melalui penggunaan sebuah panel energi surya berbentuk pelat datar (Type T-39) yang dikombinasikan dengan pipa-pipa saluran pertukaran panas pada sebuah ruang pertukaran panas. Hal ini bertujuan untuk memperoleh hubungan atau persamaan antara efisiensi panel () sebagai fungsi temperatur air rata-rata (Tavg) dan kecepatan aliran air (V). Panel energi surya ini dirancang menjadi sebuah tipe panel yang tidak dapat digerakkan namun dapat berfungsi dengan baik sebagai pemanas air. Proses pemanasan alat ini menggunakan dua media, yaitu udara dan air. Alat ini bekerja lewat variasi kecepatan air yang mengalir di dalam panel dan dengan memperhitungkan kecepatan udara yang melalui pipa-pipa saluran pertukaran panas yang berhubungan dengan panel tersebut, sehingga kondisi optimum proses pemanasan udara dapat diindikasikan pada jarak-jarak tertentu antara tabung-tabung bilik pertukaran panas. Hasil penelitian ini menunjukkan bahwa waktu efektif pemanasan berlangsung mulai dua jam sebelum tengah hari hingga dua jam sesudahnya. Untuk pemanasan udara, sebuah persamaan umum efisiensi panel diperoleh melalui hubungan antara temperatur air rata-rata yang mengalir di dalam panel (Tavg) dan kecepatan air (V), sebagai berikut :
 = 115.3336403 (Tavg)-0.097124 (V)-0.102206
Persamaan diatas mempunyai kesalahan standar (0.2375%), dan berlaku pada kisaran temperatur (Tavg) (15.86 oC) hingga (31.48 oC), dan pada kecepatan aliran (0.47 liter per 60 sec) hingga (0.600 liter per 60 sec). Berdasarkan kondisi-kondisi operasi terapan tersebut, jumlah total transfer panas bertambah sejalan dengan berkurangnya kecepatan air di dalam panel yang dihubungkan dengan pipa-pipa saluran pertukaran panas.

Keywords:
Solar energy, Panel, heating, air, heat transfer, empirical equation.

Oleh: Surian Pinem dan Elman Panjaitan

Surian Pinem adalah staf pengajar di Jurusan Teknik Industri, Universitas Bunda Mulia, Jakarta. Kesehariannya, penulis adalah salah satu peneliti utama di Badan Tenaga Atom Indonesia (BATAN). Bidang peminatan: Fisika, Matematika, Material Science.

Elman Panjaitan adalah peneliti pada PT BIN BATAN.

Samples of Cor-Ten steels have been subjected to surface treatment, by coating Al and followed by nitridation. High-temperature corrosion tests were carried out using a Thermo Gravimetry Analysis / Magnetic Suspension Balance (TGA/MSB). The Nitridation process was performed at 550°C for 3, 5, 4, 7 and 20 hours under flowing N2 and NH3 gases. Corrosion tests were performed for 50 hours at 650°C. After the oxidation, sample were characterized using X-Ray Diffractometer (XRD) to determine the crystal structure, and then using Scanning Electron Microscope (SEM) to observe the microstructure and hardness of the alloys by aloowing Micro Hardness Tester. It can be concluded that sample nitridized for 5 hours showed the lowest corrosion rate or highest corrosion resistance, due to the corrosion barrier was Al2O3 protective layer. The hardness of Cor-Ten increased from 137 VHN to 340VHN (after nitridation), and to 744 VHN after Al deposition and nitridation for 5 hours. The increase of hardness might be associated with the formation of aluminum nitride.

Keywords:
Al Deposition, corrosion resistant, Cor-Ten, nitridation, TGA/MSB, XRD, SEM