Judul: Penyusunan prosedur pengendalian mutu hasil analisa laboratorium makanan minuman:Kasus akreditasi pada laboratorium PT.Sucofindo
Abstrak: PT Sucofindo memiliki peranan penting sebagai badan yang menerima dan mengawasi mutu bahan makanan yang akan diekspor dan dijual ke pasaran. Oleh karena itu, laboratorium PT Sucofindo memerlukan standarisasi dalam memberikan jaminan mutu hasil analisa laboratoriumnya, melalui kegiatan akreditasi. Tujuan magang di laboratorium PT Sucofindo adalah untuk mengetahui cara analisa bahan pangan dalam laboratorium, terutama tentang penyusunan pengendalian mutu hasil analisa bahan pangan. Dalam kegiatan magang ini diamati keadaan laboratorium makanan-minuman dan alur manajemen laboratorium yang berkaitan dengan mutu hasil analisa. Pengamatan tersebut dilakukan dengan cara pengamatan langsung di lapangan, wawancara, praktek kerja dan studi pustaka. Selama kegiatan magang berlangsung dilakukan pengamatan terhadap titik kendali kritis dalam bidang operasi dan manajemen operasi laboratorium. Dari titik kendali kritis tersebut dapat ditentukan cara pengontrolan atau pengendaliannya, dengan demikian mutu hasil analisa laboratorium makanan-minuman dapat diandalkan. Pengendalian mutu dalam bidang operasi dititikberatkan pada bagian metode analisa, keadaan alat dan bahan kimia serta kemampuan analis. Dalam metode analisa ditentukan titik kendali kritis analisa proksimat (yaitu kadar air, kadar abu, kadar lemak, kadar protein dan kadar serat mentah). Pengendalian mutu dalam bidang manajemen operasi laboratorium pada bagian Customer Service, bagian operasi dan bagian keuangan, memiliki empat titik kendali kritis yaitu: (1) Penerimaan order oleh bagian Customer Service; (2) Persetujuan analisa dan penentuan SOP oleh kepala bidang operasi; (4) Persetujuan kepala bidang terhadap hasil analisa; (5) Persetujuan report oleh kepala bidang operasi. Masing- masing pengontrolan titik kendali kritis dilakukan berdasarkan ISO 9000 dan ISO Guide 25.
Keyword: 

Judul: Sistem Uji Profisiensi Produk Agroindustri untuk Akreditasi Laboratorium Nasional
Abstrak: Proficiency testing was inter laboratory comparisons. The same sample could have different test results when tested in some different laboratories. To find out and improve the performance of laboratories, proficiency testing can be done. Different evaluation of test results from participant laboratories could make different interpretations of the proficiency testing, which means it can also affect the assessment of the participant laboratories. The aims of this research are 1) to design a system for proficiency testing by using several evaluation methods of test results 2) to identify the testing methods used by the participant laboratories and possible causes of outlier laboratories. The method used in this research are: method 1: one round data selection by Grubbs and the rest of the data is calculated by Robust Z-Score; method 2: data selection by Grubbs several times until no more data can be excluded and the rest data is calculated by Robust Z-score; method 3: direct calculation by Robust Z-Score; method 4: calculation by reference value. The data used are the results of proficiency testing of cocoa powder, chili sauce and vegetable oil; reference values come from German reference laboratory; interview result from the stakeholders and field observations for related testing. The results show the median from Indonesian laboratories are not too different from the reference value; distributions of data are large enough, proved by CV robust larger than CV Horwitz (except for cadmium and the amount of dissolved solid); method 2 is chosen as the best method based on the smallest CV Robust; method 2 is the most sensitive which is giving the bigger number of outlier laboratories than methods 1 and 3; the number of outlier laboratories with method 2 are less than method 4; testing laboratories using National Standard of Indonesia (SNI) obtained satisfactory results (40% -100%) by method 2, for most of the test parameters; possible causes of outlier laboratories results come from a variety factors, particularly the implementation of testing that does not comply with the testing method.
Keyword: 

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
Keyword: