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An insight from homogeneity testing of long-term rainfall datasets over East Java, Indonesia 印度尼西亚东爪哇岛长期降雨数据集的同质性测试启示
Pub Date : 2024-05-24 DOI: 10.61435/jese.2024.e23
Heri Mulyanti, Istadi, Rahmat Gernowo
Robust, reliable, and trustworthy ground observation datasets are the preliminary requirement for assessing the impact of climate change over regions. Principal testing to assess the quality of ground observation rely on the missing data and homogeneity result. The study used 40 years of monthly rainfall documented from different topographical features in the monsoonal region of East Java, Indonesia. The test included annual rainfall, early rainy season (October-November-December), and primary rain season (January-February-March). The homogeneity of rainfall determined by absolute technique: Pettitt’s test, the Standard Normal Homogeneity Test, the Buishand Rank Test, and the von Neumann Ratio. Among the time series, October-November-December observation results in better homogeneity. However, the rainfall datasets during primary rainy season showed the worst homogeneity. By performing annual and seasonal homogeneity test from 67 rainfall stations: 5 stations out of data length required, 5% stations ‘rejected’, 11% ‘suspect’, 11% ‘doubtful’, and 73% were ‘trusted’. Therefore, a total of 45 stations can be used as metadata for relative comparison and 7 stations can be considered to be useful for analysis despite ‘doubtful’. The remaining 10 stations need careful consideration to be used for future water management.  Change point detected particularly between the year of 1997 through 2000. Pettitt’s test has outstanding results in the case of extreme climatic anomaly, but less sensitive of continuous abrupt change. The von Neumann test could detect abnormal data, but was not suitable for datasets containing few extreme values. The insights from homogeneity testing were: a) it is important to remove any outliers in the datasets before conducting homogeneity testing, b) both parametric and nonparametric homogeneity tests should be performed, and c) comparisons should be made with surrounding rainfall stations. Comparison with trusted long-term rainfall data is valuable for stations labeled as ‘doubtful’ or ‘suspect’ to mitigate false detections in individual homogeneity tests. The identified ‘useful’ rainfall data can then serve as reference stations for relative homogeneity tests. These findings suggest that reference stations should be assessed within similar rainfall zones.  
稳健、可靠和可信的地面观测数据集是评估气候变化对各地区影响的初步要求。评估地面观测质量的主要测试依赖于缺失数据和同质性结果。该研究使用了印度尼西亚东爪哇季风区不同地形特征记录的 40 年月降雨量。测试包括年降雨量、早期雨季(10 月-11 月-12 月)和主要雨季(1 月-2 月-3 月)。通过绝对技术确定降雨量的均匀性:佩蒂特检验、标准正态均匀性检验、布伊桑德等级检验和冯-诺依曼比率。在时间序列中,10 月-11 月-12 月的观测结果具有较好的同质性。然而,初雨季的降雨数据集显示出最差的同质性。通过对 67 个雨量站进行年度和季节同质性测试,结果表明5个站点的数据长度不符合要求,5%的站点被 "拒绝",11%的站点被 "怀疑",11%的站点被 "怀疑",73%的站点被 "信任"。因此,共有 45 个站点可用作相对比较的元数据,7 个站点尽管 "可疑",但仍可用于分析。其余 10 个站点需要仔细考虑是否可用于未来的水资源管理。 特别是在 1997 年至 2000 年期间发现的变化点。Pettitt 检验法在极端气候异常情况下效果显著,但对连续突变的敏感度较低。冯-诺依曼检验法可以检测出异常数据,但不适用于极端值较少的数据集。同质性检验的启示是:a) 在进行同质性检验之前,必须清除数据集中的异常值;b) 应同时进行参数和非参数同质性检验;c) 应与周边雨量站进行比较。对于标为 "可疑 "或 "疑似 "的雨量站,与可信的长期雨量数据进行比较对减少单个同质性检验中的误检很有价值。确定的 "有用 "降雨量数据可作为相对同质性测试的参考站。这些研究结果表明,参考站应在相似的降雨区内进行评估。
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引用次数: 0
Modeling a storage tank of carbon capture technology in a power plant in southern Iraq 伊拉克南部发电厂碳捕集技术储存罐建模
Pub Date : 2024-05-11 DOI: 10.61435/jese.2024.e13
Mustafa M. Mansour, Alaa M. Lafta, Haider Sami Salman, Sarah R. Nashee, A. Shkarah
The IEA's special study on CO2 collection, usage, and storage, released in 2020, estimates global CO2 capacity for storage to be among 8,000 and 55,000 gigatons. One of the most significant issues in introducing carbon into the energy market is improving carbon storage and developing more efficient distribution systems to increase the quantity of carbon that is held as liquid while decreasing storage pressure. The goal of this work is to investigate the efficiency of adsorption-based carbon-storing units from a "systems" perspective. The finite element approach, utilized in COMSOL Multi-physics™, is used to create an appropriate two-dimensional axisymmetric geometrical structure that balances energy, mass, and momentum based on thermodynamic extinction rules. We examine charging and discharging the storage unit with a rated pressure of 9 MPa and an initial temperature of 302 K.The storage tank is chilled using ice water. The research findings demonstrate that both simulated fluctuations in pressure and temperature during storage operations are extremely valuable. At the conclusion of charge time, the temperatures in the tank's center region are greater than those at the entry and along the wall, but at the end of discharge time, they are lower. The velocities are highest near the entry and progressively diminish throughout the tank's axis.  As a result, even the lowest possible number (8,000 Gt) substantially surpasses the 100 Gt of CO2 required to be stored by 2055 under the "sustainable development" scenario. The IEA analysis also states that the land potential exceeds the offshore potential. Land-based storage capacity is estimated to be between 6,000 and 42,000 Gt, while offshore capacity is estimated to be between 2,000 and 13,000 Gt, assuming only sites less than 300 kilometers from the coast, at depths less than 300 meters, and outside the Arctic and Antarctic zones. Development of a prediction model to improve knowledge of a novel CO2 adsorbent during the adsorbent-desorption cycle, taking into account all transport events. Validation of the model against published data for H2 storage. Predicting pressure and temperature dispersion at various storage tank sites.
国际能源机构 2020 年发布的关于二氧化碳收集、使用和封存的专项研究报告估计,全球二氧化碳封存能力在 8000 到 55000 千兆吨之间。将碳引入能源市场的最重要问题之一是改进碳储存,开发更高效的分配系统,以增加以液体形式储存的碳的数量,同时降低储存压力。这项工作的目标是从 "系统 "角度研究基于吸附的碳储存装置的效率。我们利用 COMSOL Multi-physics™ 中的有限元方法创建了一个适当的二维轴对称几何结构,该结构根据热力学消减规则平衡能量、质量和动量。我们研究了在额定压力为 9 兆帕和初始温度为 302 K 的条件下对存储单元进行充放电的情况。研究结果表明,在储存操作过程中,压力和温度的模拟波动都非常有价值。在装料时间结束时,储罐中心区域的温度高于入口和沿壁区域的温度,但在卸料时间结束时,中心区域的温度较低。入口附近的速度最高,在整个水箱轴线上的速度逐渐降低。 因此,在 "可持续发展 "情景下,即使是可能的最低数字(8,000 千兆吨)也大大超过了到 2055 年需要储存的 1 亿吨二氧化碳。国际能源机构的分析还指出,陆上潜力超过海上潜力。陆上封存能力估计在 6,000 至 42,000 千兆吨之间,而近海封存能力估计在 2,000 至 13,000 千兆吨之间,仅假定封存地点距离海岸不到 300 公里、深度不到 300 米,并且位于北极和南极区域之外。开发一个预测模型,在吸附-解吸循环过程中改进对新型二氧化碳吸附剂的了解,同时考虑到所有迁移事件。根据已公布的 H2 储存数据对模型进行验证。预测不同储罐地点的压力和温度分布。
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引用次数: 0
Performance evaluation of off-grid solar systems for critical medical instruments in remote regions 偏远地区重要医疗仪器离网太阳能系统的性能评估
Pub Date : 2024-05-07 DOI: 10.61435/jese.2024.e22
Saba Shadvar, Anisur Rahman
In areas with limited access to electricity or during power outages, ensuring continuous and reliable use of grid-powered electrical instruments is challenging, especially in remote emergency centers. A stable source of electricity is crucial to prevent disruptions in power supply, as they can lead to severe medical complications, jeopardize patient well-being, and even result in fatal incidents. To address this issue, integrating renewable electricity sources such as off-grid solar systems into existing power supply infrastructure can be a viable solution. Recent studies suggest that off-grid solar systems can be reliable and sustainable options for powering medical facilities, particularly in areas lacking uninterrupted grid connectivity. Therefore, this research aims to evaluate the feasibility, benefits, and challenges of integrating off-grid power to support critical medical instruments. Based on an extensive literature review, interviews with experts, and surveys among relevant users, this study finds that the system has the capability to maintain a consistent, dependable power supply, even during adverse weather conditions. Cost and feasibility are highlighted as paramount considerations, based on surveys and focus group results. The study concludes that off-grid solar systems offer an economical, low-maintenance, and environmentally sustainable alternative for remote medical facilities. Finally, this study proposes recommendations to optimize critical device performance during power outages and improve overall system functionality and efficiency.
在电力供应有限的地区或停电期间,确保持续可靠地使用电网供电的电气设备具有挑战性,尤其是在偏远的急救中心。稳定的电力来源对于防止电力供应中断至关重要,因为电力供应中断可能导致严重的医疗并发症,危及病人的健康,甚至造成致命事故。为解决这一问题,将离网太阳能系统等可再生能源整合到现有供电基础设施中不失为一种可行的解决方案。最近的研究表明,离网太阳能系统可以成为医疗设施供电的可靠且可持续的选择,尤其是在缺乏不间断电网连接的地区。因此,本研究旨在评估整合离网电力以支持关键医疗仪器的可行性、优势和挑战。基于广泛的文献综述、专家访谈和相关用户调查,本研究发现,即使在恶劣的天气条件下,该系统也有能力保持稳定、可靠的电力供应。根据调查和焦点小组的结果,成本和可行性是最重要的考虑因素。研究得出结论,离网太阳能系统为偏远地区的医疗设施提供了一种经济、低维护和环境可持续发展的替代方案。最后,本研究提出了一些建议,以优化断电期间关键设备的性能,并提高整个系统的功能和效率。
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引用次数: 0
Feasibility study of utilization of palm oil mill effluent (POME) as a source for microalgae nutrients 利用棕榈油厂废水作为微藻营养物来源的可行性研究
Pub Date : 2023-09-02 DOI: 10.61435/jese.2023.1
Rifqi Ahmad Baihaqi, Wahyu Dizky Pratama
As palm oil productivity increases, the waste produced will increase. Every palm oil industry produces liquid waste known as palm oil mill effluent (POME). POME contains very high BOD and COD so that it can inhibit microalgae growth. Therefore, comprehensive research is needed to find pre-treatment steps to reduce the COD and BOD content in POME before it is used as a medium for the growth and development of microalgae. The experimental mixture procedure carried out POME and microalgae according to the specified ratio. Research shows that Pond IV POME waste can be used as wild microalgae to grow, thereby reducing the BOD and COD levels of POME waste. Variable modifiers were applied to the volume of POME to the ratio of microalgae volume and the amount of nutrients provided. Microalgae growth with a ratio of 1:4 resulted in a decrease in BOD and COD to 61.66 ppm and 173.33 ppm from 110.6 ppm and 496.67 ppm. On the effect of providing C nutrition (120 ppm), resulted in lower BOD and COD at 65.33 ppm and 186.67 ppm, while the effect of providing N (40 ppm) nutrition resulted in lower BOD and reached 55.41 ppm and 158.33 ppm.
随着棕榈油产量的提高,产生的废物也会增加。每个棕榈油工业都会产生被称为棕榈油厂废水(POME)的液体废物。POME含有很高的BOD和COD,可以抑制微藻的生长。因此,在将POME作为微藻生长发育的培养基之前,需要进行综合研究,找到降低POME中COD和BOD含量的预处理步骤。按照规定的比例进行POME和微藻的混合实验。研究表明,IV池POME废弃物可作为野生微藻生长,从而降低POME废弃物的BOD和COD水平。根据微藻体积的比例和提供的营养物质的数量,对POME的体积进行了可变的修改。微藻生长比例为1:4时,BOD和COD由110.6 ppm和496.67 ppm分别降至61.66 ppm和173.33 ppm。在提供C (120 ppm)营养的影响下,BOD降低,COD为65.33 ppm和186.67 ppm,而提供N (40 ppm)营养的影响下,BOD降低,达到55.41 ppm和158.33 ppm。
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引用次数: 0
Biomass resources and thermal conversion biomass to biofuel for cleaner energy: A review 生物质资源与清洁能源热转化生物燃料研究进展
Pub Date : 2023-09-02 DOI: 10.61435/jese.2023.2
Thi Bich Ngoc Nguyen, Nguyen Viet Linh Le
Biofuel is considered as one of the solutions to future energy problems. Unlike fossil fuels, biofuel is a renewable fuel source produced from biomass. Biomass comes from a wide variety of plants and animals and even waste. Therefore, the production of biofuel from biomass is promising not only to solve energy problems but also to solve other social problems. This study will present some of the most potential biomass sources and thermal conversion processes of biomass for biofuel production.
生物燃料被认为是解决未来能源问题的方法之一。与化石燃料不同,生物燃料是一种由生物质生产的可再生燃料。生物质来自各种各样的植物和动物,甚至废物。因此,从生物质中生产生物燃料不仅有望解决能源问题,而且有望解决其他社会问题。本研究将介绍一些最有潜力的生物质来源和用于生物燃料生产的生物质热转化过程。
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引用次数: 1
Optimized conversion of waste vegetable oil to biofuel with Meta heuristic methods and design of experiments 利用元启发式方法和实验设计优化废植物油转化为生物燃料
Pub Date : 2023-09-02 DOI: 10.61435/jese.2023.4
Van Huong Dong, Prabhakar Sharma
Biodiesel generated from waste cooking oil (WCO) shows enormous potential for accomplishing SDGs and embracing circular economy principles. This strategy coincides with SDGs 7 and 12, which promote clean energy along with ethical consumerism, by converting waste cooking oil into biofuel. It reduces dependency on fossil fuels, reduces emissions, and promotes sustainable energy sources. Furthermore, using WCO biodiesel adheres to the circular economy concept, reducing waste and pollution while conserving resources (SDGs 12, 14, and 15). To optimize this process, a hybrid technique comprising RSM, ANOVA, and particle swarm optimization is being explored. Researchers achieved 90% biodiesel production employing this technology, encouraging both eco-friendly energy and resource-efficient practices. The optimized parameters produced remarkable results: 82.98% biodiesel generation with a reaction time of 101 minutes, 2% catalyst, and a methanol-to-oil ratio of 20%, demonstrating the potential of this integrated strategy.
废食用油生产的生物柴油在实现可持续发展目标和接受循环经济原则方面具有巨大潜力。这一战略与可持续发展目标7和12不谋而合,通过将废弃食用油转化为生物燃料,促进清洁能源和道德消费主义。它减少了对化石燃料的依赖,减少了排放,并促进了可持续能源的发展。此外,使用WCO生物柴油符合循环经济理念,在节约资源的同时减少浪费和污染(可持续发展目标12、14和15)。为了优化这一过程,我们正在探索一种包含RSM、方差分析和粒子群优化的混合技术。研究人员利用这项技术实现了90%的生物柴油产量,鼓励了环保能源和资源节约型实践。优化后的生物柴油产率为82.98%,反应时间为101分钟,催化剂用量为2%,甲醇油比为20%,表明了该综合策略的潜力。
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引用次数: 0
Potential of jute fiber-reinforced composites in the manufacture of components and equipment used on ships and hulls 黄麻纤维增强复合材料在制造船舶和船体上使用的部件和设备方面的潜力
Pub Date : 2023-09-02 DOI: 10.61435/jese.2023.3
Dinh Tuyen Nguyen, Huu Cuong Le
In today's maritime field, metal materials are very popular, but they have certain limitations. To meet a variety of requirements, many new materials have been used, including fiberglass reinforced composites, but these materials are often difficult to decompose, have poor recyclability, and cause a great impact on the environment after a period of use. There have been many studies aimed at using natural fibers to replace glass fibers in order to solve the limitations of glass fiber reinforced composites. Jute is one of the most popular natural fibers. Recently, researchers have focused their attention on jute fiber-reinforced composites. This article will talk about the potential of jute fiber reinforced composites applied to the manufacture of components and equipment used on ships and hulls.
在当今的海洋领域,金属材料非常受欢迎,但也有一定的局限性。为了满足各种要求,人们采用了许多新材料,其中包括玻璃纤维增强复合材料,但这些材料往往难以分解,可回收性差,使用一段时间后对环境造成很大影响。为了解决玻璃纤维增强复合材料的局限性,人们对天然纤维替代玻璃纤维进行了大量的研究。黄麻是最受欢迎的天然纤维之一。最近,研究人员将注意力集中在黄麻纤维增强复合材料上。本文将讨论黄麻纤维增强复合材料在船舶和船体部件和设备制造中的应用潜力。
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引用次数: 0
Digital twins for internal combustion engines: A brief review 内燃机的数字孪生:简要回顾
Pub Date : 2023-09-02 DOI: 10.61435/jese.2023.5
Viet Dung Tran, Prabhakar Sharma, Lan Huong Nguyen
The adoption of digital twin technology in the realm of internal combustion (IC) engines has been attracting a lot of interest. This review article offers a comprehensive summary of digital twin applications and effects in the IC engine arena. Digital twins, which are virtual counterparts of real-world engines, allow for real-time monitoring, diagnostics, and predictive modeling, resulting in improved design, development, and operating efficiency. This abstract digs into the creation of a full virtual depiction of IC engines using data-driven models, physics-based simulations, and IoT sensor data. The study looks at how digital twins can potentially be used throughout the engine's lifespan, including design validation, performance optimization, and condition-based maintenance. This paper emphasizes the critical role of digital twins in revolutionizing IC engine operations, resulting in enhanced reliability, decreased downtime, and enhanced emissions control through a methodical analysis of significant case studies and innovations.
数字孪生技术在内燃机领域的应用已经引起了人们的广泛关注。本文综述了数字孪生技术在集成电路发动机领域的应用和效果。数字孪生是现实世界引擎的虚拟对应物,可以实现实时监控、诊断和预测建模,从而提高设计、开发和运营效率。本摘要深入研究了使用数据驱动模型,基于物理的模拟和物联网传感器数据创建IC引擎的完整虚拟描述。该研究着眼于如何在发动机的整个使用寿命中使用数字孪生,包括设计验证、性能优化和基于状态的维护。本文通过对重要案例研究和创新的系统分析,强调了数字孪生在IC发动机操作革命中的关键作用,从而提高了可靠性,减少了停机时间,并加强了排放控制。
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引用次数: 0
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Journal of Emerging Science and Engineering
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