Advanced Materials Research Vol. 983

Abstract: Membrane gas separation is a forthcoming technology that advertised a great commercial potential in diverse industrial applications. Consequently, membrane-based natural gas processing has been among the fastest growing segments of the economic growth. The turbostratic structure of carbon membranes has been affirmed to accommodate with good separation selectivity for permanent gases. With that, the most auspicious technique acquired is by controlling the carbonization temperature during the carbon membrane fabrication. In this study, polymer-based carbon tubular membranes have been fabricated and characterized in terms of its structural morphology and gas permeation properties. Polyimide (Matrimid 5218) was used as a precursor for carbon tubular membrane preparation to produce high quality of carbon membrane via carbonization process. The polymer solution was coated on TiO₂ –ZrO₂ tubular tubes (Tami) by using dip-coating method. The polymer tubular membrane was then carbonized under Nitrogen atmosphere at 600, 750, and 850 ◦C. The structural morphology of the resultant carbon membranes was analyzed by means of scanning electron microscope (SEM). Pure gas permeation tests were performed using CO₂ and N₂ gases at 8 bars and room temperature. Based on the results, the highest CO₂/ N₂ selectivity of 79.53 was obtained for carbon membrane prepared at 850 ^oC.

Abstract: The paper introduces the measuring principle of glass thermal expansion coefficient. It expresses the features and advantages of the linear variable differential transformer measuring principle by comparing the thermal expansion coefficient measurement methods analysis. Meanwhile, the paper introduces DIL402PC dilatometer measuring devices and measurement procedures. It use standard samples to execute thermal expansion instrument system check from the accuracy and repeatability. The result shows thermal expansion coefficient of linear expansion instrument bias of DIL402PC dilatometer is within the error range of the theoretical value. The process proves it has a wide range of applications.

Abstract: The rice bran contains rich vitamin A, vitamin E, amino acid and niacin which are nutrient substances for the skin. These substances can keep moisture, prevent skin drying, postpone skin aging and prevent pigmentation effectively. This study used Taguchi method to plan experiment, and applied solvent extraction to extract organic rice bran concentrate, aiming to obtain the optimal beauty treatment quality. As the parameter setting is the key to the antioxidant activity quality of organic rice bran, it requires considerable costs of money, time and human experience. Therefore, this case study used L₉(3⁴) orthogonal array to plan the experimental parameters of solvent extraction which may influence the antioxidant activity of organic rice bran. The signal-to-noise ratio of experimental data was calculated to discuss the experimental results. Afterwards, the response graph was obtained by factor effects, so as to discuss the significant factors influencing the oxidation resistance quality, namely, the oxidation resistance quality characteristic of organic rice bran could be controlled effectively by controlling these factors. Finally, the confirmation experiment validated the reliability and repeatability of this experiment.

Abstract: Energy crisis are deepening with every year passing by in a country like Pakistan. One of the major contributors of energy consumption in the domestic as well as in some commercial sector is the environment air conditioning (during summers) and heating systems (during winters). One possible solution to this national energy crisis is available in the form of tapping the available renewable natural resources of energy, specifically the Ground Water Heat Pumps (GWHP). Despite its wider applications in the advanced countries, the confidence in this technology is much feeble in less advanced countries, like Pakistan, mainly due to lack of awareness about the technology among the public and lack of subsoil temperature data for the scientific / engineering community. Thus, the aim of this study is to collect subsoil water temperature data of at least one particular location for over a year, and demonstrate the usefulness of sub soil ground water in improving the performance of conventional air-conditioning system both in cooling as well as in heating modes. This study shows significant improvement in the Coefficient of Performance (COP) of the Air Conditioner both in Cooling as well as in heating modes and thus reducing the expensive electricity consumption.

Abstract: The status of solar hydrogen production, solar hydrogen production from water electrolysis, solar photochemical hydrogen production, biological hydrogen production, solar thermal decomposition of water hydrogen production and other hydrogen production methods are presented in this paper. Then the key technologies of various hydrogen production are investigated in detail. Analysing the domestic and foreign research progress, the state-of-the art solar hydrogen production can be got to know in this paper. On the basis of solar hydrogen production, some prospects are put forward.

Abstract: The main discussion in this paper is the stability of power system with interval parameters. By Lyapunov method, matrix theory and so on, the stability theorem of models with interval parameters is provided. Taking an asynchronous wind turbine model as simulation example, the interval that makes the simulation example stable is found, and the numerical simulation shows that the theorem is not only effective but also practical.

Abstract: This paper mainly put forwards the design and implementation of hydropower, thermal power, and wind power joint optimal scheduling system, introduces the framework and functional module of JAVA enterprise application technology, and focuses on the key technologies of the system. The system is based on provincial scheduling automation platform. It takes decision-making as the target, realizes wind power probability prediction, conventional power generation planning, hydropower, thermal power, and wind power joint scheduling, constraint checking, impact assessment and other functions, and helps the operators to make scientific and reasonable power generation plans, achieve intelligent scheduling, and enhance system operation level.

Abstract: This paper adopted the air plasma treatment on ultra-high molecular weight polyethylene fiber surface modification. SEM, tensile test and fiber bundle pull out test were used to characterize the influence of processing time and voltage on the effect of fiber surface modification. The results showed that the optimum conditions of surface modification were obtained by the processing parameters of pressure 15Pa, time 5 minutes and voltage 15V. At this point, the bonding strength was increased by about 82.4%, and the breaking strengthreduced by 9.7%.

Abstract: In this study the effects of the total number of regions and average power density in Modified CANDLE burn-up scheme are studied. In the previous studies usually 10 equal axial regions are applied in Modified CANDLE burn-up scheme, and in this study 6, 8 and 10 regions Modified CANDLE burn-up scheme performance is compared and discussed. The core power level varied from 800-1000MWt. Several comparisons are performed between 10 and 8 regions Modified CANDLE, 8 and 6 regions Modified CANDLE and some additional comparison which include some changing in power level. Some general remark which we can get from this study is that reducing region with the same cycle length and power level will resulted in significant drop of effective multiplication constant especially at the beginning of life and the reduction of discharge burn-up level. On the other hand the increase of the power level with the same region number and cycle length resulted in higher effective multiplication constant value especially at the beginning of life, while at the end of life the differences are decrease. Then when we reduce the region number and increase the power level at the same time we get the mixed effect in which the system performance is relatively go back to the original case.

Abstract: To study of Nuclear power simulation software's basic functions and mathematical model based on thermal analysis. Describes the two-phase flow model of GSE software superiority, as well as the software optimization program .Use of software tools for normal operating conditions of the simulation calculation and analysis of the results. Comparison with design data shows that,the software use in marine nuclear power two loop system simulation analysis field, the accuracy of it is higher.