Papers by Keyword: Organic

Abstract: Corrosion refers to the deterioration of both metal and non-metal objects caused by their electrochemical reactions with the environment around them. The objective of this study work is to investigate the corrosion characteristics of Aluminium that has been strengthened with leadwood particles. Aluminium and organic leadwood particles were combined through the process of smelting and stir-casting, using various weight ratios. Linear politization method was used to determine the corrosion rate. Taffel plots were used to determine the polarization potential and the corrosion current. The results indicated that Leadwood can be successfully used to reinforce and enhance the corrosion resistance of Aluminium. 2% leadwood reinforced sample was corroding at a rate of 1.3366mm/yr, an improvement of 37.5% to the parent Aluminium sample (2.1416mm/yr), while the 3% pulverized leadwood reinforce sample’s corrosion rate was 1.9053mm/yr (10.9% corrosion improvement).

Abstract: The goal of modern industries is to use low-cost and environmentally friendly materials, whether natural or industrial, especially for engineering and medical applications. The present work includes the manufacture of a composite material of lamination resin reinforced with two types of particles, an organic type (animal horn particles and bamboo particles) and the second type inorganic (zinc oxide particles), according to the selected weight ratios (2,4,6, and 8) %wt. and all the particles were at a granular size (5 µm). The organic particles were prepared manually according to special steps to obtain the best results. The prepared particles were checked manually by examining the particulate size by the vibrating sieve and the shape of the particles through the (SEM) test. As for the mechanical behavior of the composite material, it was studied through (tensile, shock, and hardness) tests. The results of the examination showed that the best addition of particulate matter was for the inorganic particles (zinc oxide) and all tests if compared to the organic particles. The best ratio of zinc oxide particles is (6%wt.) as the results of the tensile, shock, and hardness tests were (59 Mpa, 4.4 J, and 95) respectively. Therefore, this ratio is suitable for use in various engineering and medical applications such as foot prosthetics.

Abstract: The amount of energy generated by an Organic Photovoltaic (OPV) system depends mainly on the following.Such as solar temperatures and irradiations. Depending on the high cost and low efficiency of an organic photovoltaic system, it can be operated at the maximum power point (MPPT) that changes with solar radiation, temperature or load variations. This work presents an improved algorithm for tracking the maximum power point (MPPT) of a OPV system under real climatic conditions. The proposed MPPT is based on the perturbation and observation (P&O) strategy and the variable pitch method which controls the load voltage to ensure optimum operating points of a OPV system.

Abstract: Nowadays, one of the biggest problems is the environmental contamination, which is attributed to a great variety of factors, among which is the construction, because one of the main synthetic materials most used is concrete, artificial material consisting of portland cement, fine aggregates, coarse aggregates and water, in the production and processing of portland cement a large amount of carbon dioxide (CO₂) is generated, by 2018 approximately 8% of CO₂ emissions from the world is attributed to the cement industry. As a solution to this problem, substitutions and additions to portland cement are proposed, which will generate a reduction in consumption and processing by having a more durable and better quality material in terms of physical and mechanical characteristics. Additions of 2% are made with respect to the weight of the cement of organic additions, which do not affect the behavior of the mortar. Cubic specimens were developed for tests of pulse velocity, compressive stress and accelerated attack of sodium sulfate to determine the durability of the material, where favorable results were obtained with organic addition of corn starch.

Abstract: Organic-inorganic hybrid perovskite solar cells (PSCs) has attracted growing attention in recent years due to its outstanding photovoltaic performance. After extensive studies in material designs and device engineering, the efficiencies of PSCs have been improved to 24.2%. On the other hand, the inadequate stability of PSCs is hindering the application to real life. Starting with the stability of organic-inorganic PSCs, this article analyzed and concluded the impact of doping A-site and X-site ions on the stability of perovskite respectively. Next, it put forward the prospects for possible development directions of this field in the future.

Abstract: Indian architecture is a development of many distinct features which are inspired by its ancient vernacular techniques and the features brought by its migrants. It has attained the symbolism and importance due to its unique fusion of these building construction techniques. A comprehensive approach is necessary to understand and identify many examples of Indian architectural past to achieve the unique quality in the future of architecture. Using Eggs in the Building Finishing and Ornamentation work has been used extensively in different parts of India. Egg is an organic material which is sustainable and which has been passed on from generations. In this paper, a comprehensive review of the methods and techniques of using Eggs are documented to bring the awareness and propagate the use of this versatile material. The use of Egg waste as an additive to concrete has also been investigated.

Abstract: he paper presents the influence of the conditions of combining of the epoxy binders and particulate filler on the formation of submolecular structure of the composites. The optimum concentrations of filler among industrial waste in the composition content has been determined and the dependence of the formation of the structure of the following technological parameters such as filler concentration, order of components combining (epoxy resin, hardener and filler), solidification modes of the composition has been identified. Microphotographs of the structure and interpretation of the connection of the properties of the composites and their structure are presented below.

Abstract: Nowadays, most of the oilfields have been entered later development stage, it is difficult for reservoirs to depend on water flooding technology to improve recovery factor enormously. To satisfy deep flooding demand on heterogeneous reservoirs, the weak gel system is developed in the lab. Due to the mixture of organic chromium and HAPM, forming the organic weak gel system. HPAM concentration is from 1300mg/l to 1500mg/l and from 150mg/l to 210mg/l for cross-linking agent, the weak gel system formed stably with the high viscosity which is above 10000mp·s and moderate gelation time is from 45h to 130h.The best formula was selected with HPAM concentration 1500mg/l, and cross-linking agent concentration 210mg/l.The core displacement experiment shows the weak gel system has a well flooding effect on heterogeneous reservoirs, and its recovery rate increases 16.2%。

Abstract: This article described the technical progress of the wall insulation organic materials and analyzed other relevant factors in recent years about the insulation materials policies changes and market changes. Through the above description and analysis, we presented new ideas of the future direction of development of organic insulation materials. Background In recent years, big fire moments remind the importance of fire safety all the time. The CCTV Building Fire in 2009, Shanghai Jiaozhou Road Fire in 2010 and Shijingshan Fire in 2013, let the public turn pale at the mention of a word about fire. These fires are all related to the wall insulation organic materials. In fact, it should be said that unqualified exterior wall thermal insulation materials and the lack of supervision measures led to a variety of fire accidents which can be avoided. Therefore, good flame retardant wall insulation organic materials and thermal insulation system are very important to reduce and prevent fire, and they are also fundamentally important ways to block and reduce the fire risk. At present, there are three kinds of wall insulation materials. The first type are the inorganic heat preservation materials, such as rock wool, glass wool, mineral slurry, etc., These materials belong to no combustible materials (class A fire), and there is no fire safety problems. The second type of wall insulation materials are composite materials, such as phenolic foam insulation materials, reaching flame retardant materials B1 level (fire). The third kind are the organic polymer insulation materials, such as molding benzene board (EPS), foaming benzene board (XPS), polyurethane (PU) . They belong to the combustible materials (B2 fire). This kind of material have the danger of fire. In our country the most widely used of wall insulation materials are the third class. Especially the EPS and XPS have good heat preservation performance, low price. And They are light and durable. But, this kind of materials have obvious disadvantages that they are so easy to burn, and release diffuse toxic or harmful gas in the combustion. Therefore, we should focus on hot spots about organic fire situation of wall insulation organic materials. Fire prevention progress of common wall insulation organic materials Polyurethane (PU) :

Abstract: Microorganism control has a great significance for the safety of drinking water and reclaimed water. Disinfectants and its dosing quantity are particularly important. Several common chlorine disinfectants decay models were analyzed firstly in the paper. Results showed that a combined first and second-order model was more precise than the conventional first-order model. Then, effects of water quality and pipe conditions on chlorine decay model were also researched in the paper.