This paper deals with adjustment of certain optical parameters of nano and micro-structured particles of silica by which Mastersizer 2000 as a device for size distribution particle measurement has been used. The optical method process may be used by looking for unique refractive and absorption index of investigated particles. Optical properties, i.e. refractive index and absorption index of the silica have been found and related to inter-particle silica bindings in the form of Hamaker constants2. For the optical properties calculations using the Mastersizer 2000 Mie Scattering solutions representing the electric and magnetic induction, i.e. silica's permeability and permittivity from Maxwell's equations have been exercised.
With the development of computers and software products, there is now greater use of quantitative methods in industrial enterprises when making managerial decisions. One of the most applicable solutions to computer simulation algorithms is the Monte Carlo method. The application of the Monte Carlo algorithm lies in finding a relation between the individual variables, which are the solutions to the problem and represent the characteristics of random processes reproducible on computers. The aim of this article is to show the application of simulations from the Monte Carlo algorithm using the example of optimising vehicle fleet capacity so that the total daily costs spent on transporting goods are minimal.
The objective of this chapter is to analyze and compare various aspects of human resource management (HRM) practices in Chinese and Czech metallurgical companies. A questionnaire consisting of 58 questions devoted to specific aspects of HRM such as recruitment, performance evaluation and remuneration, and training and development was designed to acquire necessary data. Data acquired from 42 Chinese and 36 Czech companies were analyzed in order to yield the most beneficial outcomes. This chapter focuses on recruitment and selection of employees, evaluation, remuneration, and motivation of employees and career management. Results show significant differences in various aspects of HRM between both countries. Differences and some similarities are discussed and managerial implications are presented in the chapter.
Based on the samples of Shanghai and Shenzhen listed companies in China's steel industry from 2015 to 2020, this paper establishes a fixed effect model to analyze the influence of heterogeneous human capital on enterprise value. The results show that the knowledge-based human capital has less positive impact on the enterprise value of steel enterprises, but the technology-based human capital has a significant impact on them. Therefore, compared with knowledge-based human capital, steel enterprises should pay more attention to the accumulation of technology-based human capital in the process of development to promote the improvement of enterprise value.
This article presents the methods of processing gold-plated pins from, among others, used computer equipment and discusses the research results on the recovered metal. Due to the relatively small structure of the pins and the fact that the gold layer is only a few microns thick, recovering gold from them constitutes a significant challenge. On the other hand, gold is a precious metal which enables the collective removal of other metals to obtain pure gold. The suggested method involves compacting the gold-plated pins into an anode form and carrying out the electro-refining process. Metals, such as copper, tin and iron, pass into the anode sludge from which they can be extracted or serve as a commercial intermediate sold to smelter plants. The anode sludge was melted in the flame of an oxy-acetylene torch in a graphite crucible by adding borax. As a result of the melting, several metallic precipitates were obtained. Then they were hot-incorporated into a sample with a diameter of 30 mm and a height of 12 mm. Eventually, a pure gold alloy sample was obtained, which contains Cu 40.69%, Sn 9.61% and Au 48.58%.
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