Asia Pacific Journal of Energy and Environment
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Effects of Quantum Confinements in Tin Sulphide Nanocrystals Produced by Wet-Solution Technique
Get PDFIn thin film nano-crystals studies, electron energy levels are known not continuous in the bulk thin films but are rather discrete(finite density of states) because of confinement of their electron wave functions to the physically dimensions of the particles. This phenomenon is called Quantum confinement and therefore nano-crystals are also referred to Quantum dots. The quantum confinement effect is mainly observed when the size of the particle involved is too small to be comparable to the wavelength of the electron. To understand this effect, this study broke the words confinement to mean to confine the motion of randomly moving electron to restrict its motion in specific energy levels (discreteness) and the term quantum to reflect the atomic realm of particles involved in this study. So as the size of a particle decrease to a nano scale, then the decrease in confining dimension causes the particle energy levels to be too discrete and at the same time widens up the band gap. As a result the ultimately effect is that the band gap energy increases. In this study, nanocrystalline tin sulphide (SnS) powder was prepared using tin chloride (SnCl2) as a tin ion (Sn+2) source and sodium sulfide (Na2S) as a sulfur (S-2) ion source using solution magneto DC sputtering technique. The as-synthesized thin film in form of nanoparticles were then qualitatively and quantitatively analyzed and characterized in terms of their morphological, structural and optical properties and found to have an orthorhombic structure whose direct band gap had blue shifted (1.74 eV) and was confirmed using theoretical calculations of exciton energy based on the potential morphing method (PMM) in the Hartree Fock approximation
‘Wasteaware’ Indicators: an Assessment of the Current Solid Waste Management System in Lahore, Pakistan
Get PDFThe present status of solid waste management reviewed into this article based in Lahore, Pakistan. Following UN-Habitat city profiling with involved systematic quantitative, qualitative assessment, governance features of the present waste management includes in and shows the present system, waste collection, transportation is the main concentration and producing 74,000 tons year-1 of organic compost. Lahore waste management system (LWMC) is low in their target market consulted in decision making (inclusivity) and bad performance (governance features). Formal waste management system having backward of the informal system, which is absolutely inconsistent with current waste management systems. Watchful arranging and organization proposed here to reduce the trouble by integrating informal waste management system into formal waste management system for shared advantages. The integrated sustainable waste management (ISWM) indicators used for different levels of income class and LWMC performance in Lahore. Recommendation builds for the public awareness for recycling and to make the integrating informal sector sustainable system and fill the historical data gap
Hybrid Automata: An Algorithmic Approach Behavioral Hybrid Systems
Get PDFHybrid automata strategies have advanced as a vital tool to design, check and direct the execution of hybrid systems. Any way they can – and we assume should – be utilized to communicate quantitative models about hybrid systems in different areas, for example, experimental sciences. Since the conventional design of hybrid automata compares well to consecutively integrate behavioral chains in living creatures, we look for a use of hybrid modeling procedures in the social sciences and, particularly, brain research. We attempt to address the question related to how human drivers move onto an expressway and simultaneously utilize this study as our test-bed for utilizing hybrid automata inside behavioral sciences. Hybrid automata give a language to displaying and exploring advanced and simple calculations in real-time systems. Hybrid automata are studied here from a dynamical systems point of view. Essential and adequate conditions for the presence and uniqueness of arrangements are inferred and a class of hybrid automata whose arrangements rely consistently upon the underlying state is described. The outcomes on presence, uniqueness, and progression fill in as a beginning stage for solid study. In this paper, we present the structure of hybrid automata as a model and detailed language for hybrid systems. Hybrid automata can be seen as a theory of timed automata, in which the behavior of factors is represented in each state by a bunch of differential conditions. We show that a large number of the models considered in the workshop can be characterized by hybrid automata. While the reachability issue is undecidable in any event, for extremely confined classes of hybrid automata, we present two semi-decision techniques for checking security properties of piecewise-straight hybrid automata, in which all factors change at steady rates. The two techniques are based, individually, on limiting and figuring fix points on for the most part endless state spaces. We show that if the end of the method, at that point they offer the right responses. We then show that for a significant number of the run of the mill workshop models, the strategies do end and hence give an algorithmic approach to confirming their properties
Using Markov Analysis to Study the Impact of Temperature in Bangladesh
Get PDFIn this paper has been studied the temperature trend in Bangladesh. Long-term changes of surface air temperature over Bangladesh have been studied using the available historical data collected by the Bangladesh meteorological Department (BMD). Daily temperature data is collected from BMD in Dhaka and Chittagong. Then month have been divided according to season and their descriptive statistics are computed. Maximum average temperature in pre-monsoon season and minimum average temperature in winter season have been shown in the paper. This study also reveals that temperature has increased over the time. Markov chain analysis has been applied for these data so as to find the stationary probability. After 26 and 13 days stationary probabilities in Dhaka and Chittagong stations respectively have observed
How Artificial Intelligence Improves Agricultural Productivity and Sustainability: A Global Thematic Analysis
Get PDFIn the face of the agricultural sector\u27s challenges, food security with an increasing human population and high demand for food is a significant problem. Traditional methods used by farmers have not been sufficient to meet the food requirements of the growing population. As a result, the agricultural sector has begun to deploy artificial intelligence to meet the demand for food and sustainability. This study was conducted to examine how AI improves farmers\u27 productivity and sustainability. Data were analyzed using centering resonance analysis, t-test, ANOVA, and text mining news articles from 2014-2019 in Africa, Asia, Europe, and North America. Results show that AI is used primarily to increase productivity and efficiency and secondarily to address labor shortages and environmental sustainability concerns. The results at the regional level reflect the active adoption of AI in North America and Europe, with increasing efforts in Asia and Africa
Construction and Testing of a Bent Heat Pipe
Get PDFHeat pipe was reviewed in former time which was in linear design. But in most cases, the heat pipe is needed in a bent shape. For instance, in a car, the heat transfer way from the engine to the radiator is not in linear. To move heat from parts in a computer i.e. central processing units of the computer may use non-linear heat pipe to reduce the heat generated in it. So the performance analysis for a bent heat pipe is badly needed to fulfill the current demand. In this research, a bent heat pipe was constructed and the performance analysis have been conducted on the bent heat pipe
Iran’s Oil and Gas Legal Framework: from Exploration to Revolution
Get PDFThe main purpose of this article is to examine Iran’s legal and contractual framework for their petroleum, oil and gas industry. Basically, the legal and contractual framework of the Iranian oil and gas industry has been classified into three periods. The first period is from the exploration and discovery of oil in Iran to nationalisation (1901-1951), the second period is from nationalisation to revolution (1951-1979), and the third period is from revolution to the present day (1979-20016).Because each period has its own features and importance two articles will examine this topic. The first period (from exploration to nationalisation, 1901-1951), and second period (from nationalisation to revolution, 1951-1979), has been examined in this article with legal and comparative analysis, and the third period (1979-2016) will be covered in a later article.It should be mentioned that each contractual framework was a turning point regarding to opportunities and circumstances that they have been in that time and also each of those petroleum contractual regimes were a step toward to contractual framework evolution in Iran
Sources of Environmental Hazards Effects and Control
Get PDFThe entire world become village and whatever affects a country will ultimately affect the neighbouring ones. Since the environment is being constantly polluted by man through its various activities such an acts constitutes hazard to man and its ecological being and a threat to public health. An environmental hazard is a substance, state or event which has the potential to threaten the surrounding natural environment and / or adversely affect people\u27s health. This term incorporates topics like pollution and natural disasters such as storms and earthquakes. Human-made hazards while not immediately health-threatening may turn out detrimental to man\u27s well-being eventually, because deterioration in the environment can produce secondary, unwanted negative effects on the human ecosphere. The effects of water pollution may not be immediately visible because of a sewage system that helps drain off toxic substances. If those substances turn out to be persistent (e.g. persistent organic pollutant), however, they will literally be fed back to their producers via the food chain: plankton -> edible fish -> humans. In that respect, a considerable number of environmental hazards are man-made (anthropogenic) hazards. This necessitate to this study of investigating, the sources, effects and controls of environment hazards. Data were gathered from Primary Health Care (P.H.C) department and from environment department through oral interview method. The findings from the data collected revealed that’s the people in the study area have negative attitude towards environmental hazards which make them to mismanage environmental resources such as land, water and air. Investigation also shows that, there were poor and inadequate system of refuse disposition and that the system most of the houses in the area are without adequate toilet facilities. Health education should be given to the people on the sources and effects of environmental hazards. It is therefore hoped that, if the recommendation made in this study is staffs strictly adhered to, it would go a long way in improving the environmental condition
Integrated Water Resources Management (IWRM): Maximise Usage and Minimise Wastage of Water Resources
Get PDFFollowing the implementation of GWP (Global Water Partnership) in 1996 by UN the countries around the world began to implement the principles of IWRM to minimize water waste and maximize its beneficial use. The Ministry of Local Government, Rural Development and Cooperative in Bangladesh also adapted the idea and created IWRM unit in 2003 through WARPO, CEGIC and IWM. Bangladesh is going through serious shortages of fresh water resources. Major reasons are: diversion of natural river flow in the upstream area; rapid siltation on river beds which have seriously reduced water holding capacity causing regular floods destroying crops, making people homeless and even loosing many lives, destroying economic progress; and change of climate pattern, seawater encroachment due to sea level rise destroying fresh water resources and cropping lands due to climate change impact and greenhouse gas emission. To overcome these issues the country must adapt the following steps: implementation of IWRM practices to its maximum capacity. IWRM will include surface water, groundwater, waste water and sewage water resources to design its maximum utilization. In addition WSUD techniques; urgent dredging of rivers; positive negotiation with the neighbors for surface water sharing and storing excess surface water during monsoon at series of reservoirs built in upstream locations and use them during dry season. The biggest task of Bangladesh IWRM is to educate all stake holders; establish proper coordination among all water management sectors and train up end users to transform them as guardian angels of water conservation
Water Quality Assessment of Ponds and Charas of Sylhet City based on pH, DO and BOD
Get PDFAt present, the condition of surface water is much declining and the quality of water is a vital concern for mankind. It is directly linked with human security. Greater part of people is still not aware of it. So, improvement of the condition of surface water is a crying need. Surface water is often physically contaminated due to unhygienic practices. Discharges from various contaminated sources are very common thing in city life which deteriorates the water quality and necessary treatment is required to make water usable. The investigation is based on laboratory tests on water samples obtained from seven Ponds and three Charas of Sylhet City Corporation. The selected parameters for assessing the water quality are PH, Biochemical Oxygen Demand (BOD) and Dissolved Oxygen (DO). The present condition of Ponds and Charas water are not up to the mark and it is declining day by day. Proper initiatives need to take regarding the control of surface water pollution in Sylhet