Papers by Keyword: OPC

Abstract: Generally, the setting time and early strength of the cementitious materials are good indications to identify their suitability to be employed as binding materials. Due to the high surface area of nanomaterials, it is considered one of the optimal solutions to modify these properties. Accordingly, this work is focused on comparing the impact of laboratory-prepared tungsten oxide nanoparticles (WO₃-NP) on two cementitious materials: OPC and alkali-activated slag (AAS). The initial/final-setting time and early compressive strength up to 28-days of the OPC and AAS specimens, modified with 1, 2 wt.% WO₃-NP, were investigated. The results displayed that WO₃-NP has a significant impact on the acceleration of the initial/final-setting time of both binding materials. Moreover, the optimal dosage from WO₃-NP (1 wt.%) upgraded the compressive strength by 19.5 and 15.1% for OPC and AAS, respectively after 7 days. The nucleation-seeds and nano-filler effect of WO₃-NPs are the focal explanations behind improving these properties via the formation of strength-giving phases and then obtaining a compact microstructure as proved by XRD and SEM.

Abstract: . The use of Ordinary Portland Cement (OPC) for building structures should be reduced because it can produce harmful CO₂ emissions. The use of environmentally friendly materials could be the solution. Liquid carbon dioxide (CO₂) is one of these material innovations. In this study, the liquid carbon dioxide was used as a substitute for OPC. The use of this material will affect the rigidity of the multi-story building structure. The effect of the stiffness variable value is tested by looking at the response of multy storey buildings during an earthquake. By using the finite difference method, the response of the multi-story building structure is analyzed through mode shape, structural displacement, and shear force.

Abstract: Ordinary Portland Cement (OPC) used in building structures has a negative impact. The presence of CO2 emissions produced becomes very dangerous. To reduce this impact, materials that are more environmentally friendly are used. Silica Fume and liquid carbon dioxide (CO2) are among them. In this study, silica fume and liquid carbon dioxide were used as a substitute for cement. The effect of the stiffness of the two materials and the earthquake lateral load was tested by looking at the response of the high-rise building. Through numerical simulations, we compare the mode shape, displacement of the structure, and the sheer force experienced by the structure.

Abstract: Tin slag is one of smelting waste that has not been utilized yet. As substitutional, cementious material in concrete replaced the function due to its similar oxide existence with Ordinary Portland Cement (OPC) such as SiO₂, CaO, Al₂O₃, and Fe₂O₃. The objective of this research is to evaluate the corrosion behavior on the surface of carbon steel rebar due to the effect of partial substitution of tin slag in mortar. In this research, final tin slag added with ratio of 0.1, 0.2, 0.3 from total cement. The concrete had been cured for 28 days of immersed in NaCl 3.5% solution for 6 days. The corrosion behavior against steel reinforcement inside concrete measured by Electrochemical Impedance Spectroscopy (EIS) method and the result shows that 20% tin slag from the total of cement give the most competitive corrosion resistance than the others.

Abstract: A distributed cross-direction control system based on CAN-bus was designed to solve the large-scale cross-direction control problem for paper machine. Multiple Master-Slave CAN networks were constructed in parallel to coordinate and control multiple array actuators, and the Ethernet/CAN converter was used to connect the monitoring station with the field intelligent actuators. The monitoring station accesses measured data and field data via OPC technology. A CAN application layer protocol and corresponding underlying communication software were designed according to the characteristics of the cross-direction control processes. Finally, the feasibility and reliability of the system were verified with practical applications.

Abstract: With the development of the LED bulb assembly line, the demand of the production line monitoring system is getting higher and higher. A real-time LED bulb assembly line monitoring system based on the OPC technology and Microsoft Visual Studio 2010 software is established. The real-time data of the LED bulb assembly line is provided to achieve the function which concludes alarming, scheduling, showing and so on. LED bulb assembly line monitoring system provides the strong safeguard for the smooth operation of production line.

Abstract: Aiming at the problem that there are many .NET based software need to access COM based OPC servers. This article developed an OPC client for .NET based advanced control software. Firstly, this article introduces the structural characteristics of OPC, then describes the whole process to develop this client software, and finally shows the experiments result that the client could access data with an OPC server stabilized. This client could be a good solution to solve the communication problem between .NET and COM platforms.

Abstract: Effective control algorithm can be applied to the real-time control system by the data exchange between MCGS and MATLAB with OPC technology, as a result, a testing platform for advanced control algorithms is established. The paper presents a second-order liquid level control system for research example; the BP neural network algorithm is applied to the control system. The communication process verifies that the data exchange is reliable and the simulation results show the control of the BP neural network algorithm for real-time optimized control process is effective.

Abstract: Real-time information feed describing the state of production system is the key to successful management of any company, because up-to-date information is necessary basis for decision making in company operating on globalised market. Data describing the state of the production system should be collected in the manufacturing system, pre-processed, interpreted, filtered, archived and finally, either used in IT systems supporting company management (MES, ERP), or directly presented to crew and managers responsible for specific areas of interest. Possibility of data acquisition in companies strongly depends on specific of branch of industry, technological processes automation level, number of operations performed manually, type of production, etc. Acquisition of data on state of the production system should be carried-on automatically, without involvement of workers. This paper presents overall description of issues of data acquisition in company, proposed Manufacturing Information Acquisition System (MIAS) and the case study of data acquisition in company leading continuous, automated production processes Central Wastewater Treatment Plant (WWTP) in Gliwice, Poland.

Abstract: s. This thesis introduces core technology and methods of structuring the dynamic industrial equipment management system, which are technology foundation of building the system.