Judul: Analysis of Quality and Process Capability for Production of Cigarette Paper
Abstrak: Penelitian ini dilakukan di perusahaan kertas rokok (sigaret) PT. Surya Zig Zag, Kediri. Tujuan penelitian adalah melakukan analisis pengendalian mutu terhadap beberapa karakteristik dari produk kertas sigaret. Jenis kertas yang diarnati adalah vel/in 22, verge Lt.aks, plug wrap 27 danyellow tipping, dengan sasaran dua karakteristik mutu yang paling penting, yaitu grarnature clan porositas. Karena karakteristik mutu ini sating berhubungan clan keduanya menentukan manfaat dari produk, maka analisis dilakukan dengan menggunakan grafik pengendali x peubah ganda (T2-Hotelling) clan grafik pengendali Isl. Hasil analisis grafik pengendali rataan menunjukkan proses tidak terkendali karena sebab-sebab terduga, yaitu proses sempat berhenti, kecepatan mesin turun, formasi kertas kurang baik, pergantian bahan baku, kerusakan mesin clan pergantian operator. Narnnn setelah titik-titik diluar batas pengendali dihilangkan, proses menjadi terkendali pada ct=0.0 I clan BPA=l 9.46. Keragaman proses untuk data verge Lt.aks terkendali secara statistik seclangkan untuk data lainnya, keragaman proses tidak terkendali. Setelah proses terkendali dilakukan analisis kemampuan proses terhadap masing-masing karakteristik mutu. Hasil analisis kemarnpuan proses untuk semua data cenderung terjadi pergeseran proses, tetapi pada karakteristik mutu grarnature data yellow tipping, menunjukkan tidak terjadi pergeseran proses dan semua produk memenuh.i spesifikasi yang diinginkan. Untuk menjaga mutu kertas sigaret dari PT. SZZ, disarankan agar pihak quality control PT. SZZ selalu meningkatkan pengawasan sebelum proses produksi berjalan, seperti pengecekan mesin-mesin, pergantian bahan baku clan melakukan pelatihan bersarna terhadap operator sehingga mempunyai cara kerja clan prinsip yang sama dalaru bekerja.
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Judul: Pengendalian Kualitas Pada Proses Produksi Kertas Medium di PT Indah Kiat Pulp & Paper, Serang Mill
Abstrak: Paper with several sizes plays an important role in human life especially in modern society. Now paper becomes one of human needs and is used in various cases. With times, the paper consumption surely increases because of paper characteristics easily used, practical, light, cheap and can be recycled. Based on rising need of paper, it is a challenge for thefact01Y to increase the quality, capacity, and technology in the paper production. Qualified product is affected by production level through monitoring for each level of the production process. Quality management can be used for quality control, so that it can minimize product damage. The research was conducted at PT Indah Kiat Pulp and Pap~r, Serang mill (PT IKP P). The objective of the research is to identifY level factors of production process that influence final product quality, to analyze pelformance of production process, and main parameter of product quality by using quality management technique namely cause and effect diagram and control chart, identifYing the process instability systems and analyzing the correction process by using information ji-om observation, literature study and expert opinion in the research plant.
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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.
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