SAMPLE TEMPERATURE DURING CORROSION REMOVAL BY LOW PRESSURE LOW-TEMPERATURE HYDROGEN RF PLASMA

Abstract. The plasma chemical reduction of corrosion layers from archaeological metallic objects is developing since the late 70 th . Contemporary, it is used in some museums, but the optimal treatment conditions are not fully known yet. Treated object temperature is one of the most critical points because metallographic changes can be initiated by elevated temperatures and thus the unique historical information can be lost. Temperature increases due to the direct inductive heating in the discharge as well as by the interaction of the surface with plasma active particles. In the case of samples prepared in acidic corrosion environment, the maximal temperature of the samples with the incrustation was lower than of samples without incrustation treated under the same conditions because the incrustation layers decrease the direct interaction of plasma active particles with the corrosion layers. In contrary, in the case of brass samples prepared in the ammonia atmosphere, the incrustation had an opposite effect due to intense heating of the sample during the reaction with oxygen presented in the outer corrosion layers. The maximal sample temperature was directly proportional to the linear size (or the third root of weight) of the treated sample

Molecular Dynamics Simulations of Poly(dimethylsiloxane) Properties

Models of poly(dimethylsiloxane) (PDMS) oligomers differing in topology are defined and structure and mechanical properties of these analysed by three different theoretical approaches: the Bicerano graph method, atomistic molecular dynamics simulations and mesoscale dissipative particle dynamics. The calculations are performed within the simulation software environment Materials Studio (Accelrys Software Inc.). The obtained values of the Young and bulk modulus are juxtaposed to experimental data available for real PDMS materials and quality of the agreement discussed in relation to the theory level and simulation method applied

Studi Tentang Quality Of Service Yang Dilakukan Oleh PT. Texascom Hitek System Di Surabaya

Sejalan dengan kemajuan teknologi di segala bidang, menyebabkan terjadinya perubahan dalam lingkungan ekonomi, sosial dan budaya yang mengakibatkan berubahnya pola hidup dalam masyarakat. Masyarakat dewasa ini sangat memerlukan alat-alat bantu yang dapat mendukung daya kerjanya agar semakin optimal. Salah satu dari alat bantu tersebut adalah komputer. Hal ini sangat disadari oleh para produsen komputer dan merupakan peluang bisnis yang menguntungkan. Dengan banyaknya merek yang menawarkan produknya maka persaingan pun sangat ketat. Dengan adanya persaingan dalam memasarkan produk yang dihasilkan timbullah ungkapan sebagai motto yang dilakukan untuk memuaskan keinginan konsumen yaitu "pembeli adalah raja". Pandangan ini dikembangkan dalam rangka untuk dapat mencapai sasaran pemasaran yaitu keuntungan badan usaha jangka panjang melalui pembinaan pelanggan dengan memberikan kepuasan bagi keinginan dalam pemenuhan kebutuhan konsumen ..