Papers by Keyword: Parameter

Abstract: This investigation was carried out in a lab setting with the aid of a filter set. This study aimed to lower the level of clean water contamination and assess the filter media's performance in Fitu Village, Ternate City, using physical and chemical criteria. Temperature, turbidity, total dissolved solids (TDS), and odour are physical parameters. While pH, Mn (manganese), and Fe (iron) are the chemical parameters. Sand-activated carbon made of silica and zeolite is the filter medium. One hundred eighty litres of water from a resident's well make up the sample. The physical characteristics, namely the TDS of 1250 mg/L, the turbidity of 27 NTU, and the temperature of 25 °C, show the outcomes of investigating healthy water as raw water in the Kelurahan Fitu. Fe concentration was 1.3 mg/L, Mn concentration was 0.6 mg/L, and pH was 9. Water is passed via silica sand, zeolite, and activated carbon filters before entering the filter after further inspection. According to the results, the TDS has dropped to 897 mg/L, the turbidity has changed to 24, and the temperature is 24 °C. The filtered water meets the chemical standards for Fe concentration with only 0.91 mg/L of Fe, 0.45 mg/L of Mn, and a pH of 7.9. According to the study's findings, inhabitants of Fitu Village in Ternate City can efficiently reduce pollutants and metal levels in their healthy water by employing a filtering system that uses silica sand filter media, zeolite, and activated carbon.

Abstract: In order to prevent distortion caused by heat which affects the material deformation, the properties controlled are required. The properties changes and the placement of the mounting position will effect the weld strength that causes cracks and broken joints, therefore it affects the safety of machine construction. Thus, the objective of this paper is to control the shape of cross member backbone assembly by gas metal arc welding (GMAW). The welding is produced by an automatic robot Yaskawa-MA1440 type. In order to obtain the good quality of the result, the welding shape is controlled by a parameters combination of voltage, current, and speed. Yaskawa-MA1440 type is used as the automatic welding machine. The main material used is cold rolled steel coil sheet MJSC270D-OD with a thickness of 1.2 mm. In addition, to control the welding shape, the specified shape design standard is followed include travel speed, gas flow, welding direction, torch tip distance to the workpiece, torch angle and welding angle. The results of visual and dimensional were also examined in this research. Furthermore, the macrostructure i.e. leg length, fusion penetration, throat thickness have been analyzed and confirmed based on the standards used in the auto body vehicle part company. The appropriate parameters for the finest welding shape are defined at the horizontal position using an electric current of 120 A and the welding voltage of 18 V (± 1 V). Thus, the measurement control of macrostructure is defined as reference parameters for mass production of cross member backbone assembly.

Abstract: Chromatographic separation is an indispensable and important technology in the manufacturing process of chemical products and biomedicine. It uses the distribution differences of a compound in the stationary phase and mobile phase to achieve the separation of the mixture. It is of great value to study the separation process of substances by simulated moving bed chromatography. By digitally simulating the process of moving bed, we can observe the influence of parameter changes on substance analysis by chromatography, and then find out the law of substance separation, which can provide theoretical basis for scientific research of biopharmaceuticals.

Abstract: Recent years have highly been productive in terms of development of both conventional machining technology, but in workpiece surfaces finishing, as well. The overall trend is heading towards increasing accuracy and quality of the manufactured components for machinery and equipment. In a range of finishing abrasive technologies there has been known the introduction of microcrystalline corundum, modification of tools with these abrasive grains, including sintered tools. This development continues and the latest trend is the development of pyramidal grain the Cubitron II. How individual grains behave during operation and how we can use their properties in comparison to classic white corundum still remains complicated matter. The behaviour of selected abrasives has been described in the submitted article.

Abstract: In this article we have explored the issue of optimization of HPP site location in a cascade depending on social-economic, environmental and energy limitations taking into account available cadastre of water power resources. A multicriterion problem of optimization on the network was formulated. Pareto optimal solution of this problem was obtained by means of the developed mathematical model of optimization of the HPP site location in the cascade. The optimization algorithm to solve this problem has been developed

Abstract: A SVM calibration model combined with new information processing method of support vector machine and infrared spectroscopy is established. For the problem of model parameters affecting the analysis results, the optimization of the model parameters is studied through the experiment. The mixed gas containing hydrocarbon is used as an example, spectra data preprocessing, spectra analysis band, spectrometer scanning interval, types of kernel function for SVM calibration model, penalty factor C, and other parameters that affect the measurement results are optimized. The experimental results show that the accuracy of the analysis results can be improved in the case of the SVM calibration model optimized and the model has a practical application value.

Abstract: A new training method is proposed, which could solve the problem of that parameters of fractional order controller are not easy to be selected. This method which based on the principle of gravity optimizes parameters. Random initial parameter based on step was set as coordinate form which in the midpoint of the multidimensional space. The error between the actual output and the target output was set as radius. This method had advantages which could not need to calculate the gradient and could randomly select initial. Through the simulation experiment, this method is successfully applied in the fractional order PID controller, which obtains the optimal parameters.

Abstract: Considering the requirement of Shenzhen power grid development, this paper investigates the parameters selection for 220/20kV gas insulation transformer, including capacity, short circuit impedance, cooling mode, insulation level, over-load capability, temperature rise tolerance, loss , noise level and bushing selection. For different capacity value, the investment and loss concerning substation, 220kV grid and 20kV grid are analyzed and compared, by which the final capacity value is determined. The short circuit current level, transformer loss, manufacturing capability and investment is investigated to determine the short circuit impedance for the gas insulation transformer. The characteristic and application condition of gas cooling as well as liquid cooling mode is studied and the cooling mode for the gas insulation transformer is determined. The insulation level, overload capability and temperature rise tolerance are determined by considering related standards and the requirement of Shenzhen. The loss and noise level for the gas insulation transformer is determined by considering related standard and parameters of the domestic gas insulation transformers in operation. The gas-gas bushing is used to connect cable box and the transformer.

Abstract: Due to their excellent properties, carbon nanotubes (CNTs) have the potential to be applied as functional elements for nanoelectronics, nanoelectromechanical systems, new energy, sensors, and others. One precondition for many of these applications is to assemble CNTs into devices and the number and position of assembled CNTs usually need to be controlled. The process factors for CNT assembly by dielectrophoresis (DEP), which include the magnitude of the applied voltage, the concentration of the CNT suspension, the duration of the electric field, and the geometry of the CNTs, and the shape of the electrodes, have great influence on the assembly results. Some techniques based on DEP, such as those adding floating electrodes, optically induced DEP (ODEP) and using hydrodynamic force, can realize precise positioning of CNTs. This paper introduces the factors and techniques which influence the number and position of assembled CNTs. The research intends to provide help for the application of CNTs in nanoelectronics.

Abstract: The paper is concerned with the functional scheme and the basic equipment of a thermal station. Parameters requiring control in the continuous process of the heat transfer medium production and its delivery to the consumer are listed. The authors show the technological relationship between water heating conditions and the thermal station controlled electric drives providing the predetermined process conditions. Functional relations determining the balance of water flow and water pressure of the thermal station and the consumer as well as the relation of water flow and temperature of the hot water boiler are given. The functional scheme of control system for the thermal station output parameters and the block scheme of the local control systems of the heat and water balance are shown. The principles of process parameters control are justified.