Hasil untuk "Industries. Land use. Labor"

Zhenyu Wang, Jing Sun, Zixiao Guo et al.

Vanadium redox flow batteries (VRFBs) face a significant challenge during high-temperature operation, as the precipitation of V2O5 on the positive side obstructs electrolyte flow, drastically diminishes battery capacity, and eventually leads to battery failure. While various additives have been explored to mitigate V2O5 precipitation, it continues to occur at temperatures exceeding 40 ℃. Unfortunately, there is a lack of research focused on effective methods for removing V2O5 from the battery system. The conventional approach requires disassembling the battery stacks to eliminate V2O5, a process that is not only labor-intensive and costly but also risks damaging the performance and components of the battery. In this study, we introduce an additive free strategy that enables the removal of V2O5 from the battery without the need for disassembly, thereby fully restoring battery capacity. This method is both efficient and simple, offering a cost-effective solution for V₂O₅ dissolution while potentially simplifying VRFB electrolyte manufacturing.

Abdelmoneim Ahmed Eltohamy, Shereen Aly Hussien Aly Abdou

This study investigates the moderating role of perceived utility on the relationship between the advertising mix and mobile app adoption in Egypt, an emerging market. Drawing on the Unified Theory of Acceptance and Use of Technology (UTAUT), the research explores how perceived utility, defined as the extent to which consumers believe a mobile app enhances their performance or provides value, influences the effectiveness of various advertising mixes in mobile app adoption. Using a quantitative research design, data were collected from 418 Egyptian consumers exposed to mobile app advertisements. The findings reveal that the advertising mix and perceived utility significantly impact mobile app adoption, with perceived utility as a positive moderator. Specifically, the study demonstrates that when consumers perceive higher utility in a mobile app, the effectiveness of the advertising mix in mobile adoption increases. This research contributes to the marketing literature by extending UTAUT to include the advertising mix as a determinant of technology adoption in emerging markets. It also provides actionable insights for marketers and policymakers, emphasising the importance of tailoring advertising strategies to enhance perceived utility and improve adoption rates in culturally and economically diverse contexts.

Héctor Flores Márquez, Adrián Jiménez Gómez

La corrupción es un fenómeno social que tiene un profundo efecto en la región de América Latina, por esta razón, se plantea encontrar las causas que contribuyen a su desarrollo. Se utiliza la metodología del Promedio de Modelos Bayesiano con Variables Instrumentales (IVBMA, por sus siglas en inglés), para hallar determinantes robustos de la corrupción en 19 países latinoamericanos. Se consideran 23 regresores con observaciones de 2013 al 2020. El IVBMA efectúa 8,388,608 modelos, con el fin de extraer los determinantes más robustos. Se revela que elementos institucionales y económicos son mejores predictores de la corrupción en la región.

Oana-Elena Chelariu, Ionuț Minea, Corneliu Iațu

The multidisciplinary approach outlined in this paper aims to assess the correlation between geophysical and social vulnerability for disaster risk reduction. To achieve this, two multi-criteria methods based on Geographic Information Systems (GIS) techniques have been integrated to assess the risk to natural hazards in the North-East Development Region. The Analytical Hierarchy Process (AHP) was utilized to conduct a comprehensive hazard analysis, including floods, landslides, and earthquakes. The Principal Component Analysis (PCA) method was applied to examine the spatial distribution of social vulnerability at the Local Administrative Unit (LAU level), utilizing 24 variables to generate 6 principal components. Based on these results a Regional Risk Index (RRI) was developed using the bivariate method, combining the multi-hazard distribution with social vulnerability. The results showed that the north-eastern part of the region presents the highest risk, encompassing 10.68% of administrative units. These results can contribute to the design of risk reduction programs and policies.

Zhengxin Zhao, Zongyang Li, Yao Li et al.

Maize-soybean intercropping systems are widespread in North China. However, the combined effects of supplementary irrigation and different nitrogen (N) application rates on the productivity, water use efficiency (WUE), and N use efficiency (NUE) of such systems remain unclear. A field experiment was conducted in a semi-humid drought-prone region in Northwest China in 2022 and 2023 to assess the interaction effects of supplemental irrigation and different N application rates on the crop yields, WUE, and NUE of a maize-soybean intercropping system and a monoculture system. Three cropping systems were used: maize-soybean intercropping, maize monoculture, and soybean monoculture, with two irrigation treatment scenarios (rainfed and supplementary irrigation at 30 mm) and three N fertilizer rates for maize (240, 180, and 120 kgN ha−1). The land equivalent ratio (LER), ∆water productivity (WP), ∆N harvest index (NHI), and ∆N partial factor productivity (NPFP) of the maize-soybean intercropping system ranged from 1.06 to 1.11, 1.03–1.11, 1.17–1.34, and 1.16–1.28, respectively, demonstrating higher yields and resource of the intercropping system Supplementary irrigation significantly improved yield and resource use by improving the N complementarity effect and increased the economic by 17.24–31.16 %. A 25 % reduction in the N application rate (180 kgN ha−1) for maize increased the NPFP without decreasing the crop yield and WP whereas, a 50 % reduction (120 kgN ha−1) significantly decreased the crop yield and the economic benefits. In summary, supplementary irrigation can improve the productivity and resource use efficiency, and appropriate reduction of N fertilizer will not reduce the yield of intercropping system. This study provides practical insights for enhancing sustainable agriculture by improving water and N use efficiency in maize-soybean intercropping systems in the semi-humid arid-prone regions of China.

Desika Nur Jannah, Herman Novry Paninggiran, Almas Nabili Imanina

This study aims to fulfill tourist satisfaction through quality travel management. This research is a qualitative research. The location of this research is in the Old City of Semarang. While the informants in this study were tourists from the Old City of Semarang. Based on the results of the discussion that has been presented, it is known that travel services in the Old City of Semarang are quite helpful for tourists. The travel management used is structured and directed, such as notification of information on every tourist spot visited and good communication with tourists. Good service providers can increase tourist satisfaction, build a good reputation, and drive the growth of the tourism industry as a whole. The focus of this research is the way the travel tour in serving the tourists who are being combined.   Keywords: Management of Travel, Tourist Satisfaction, Tourist, Literature Review, Old City

Ronald Twongyirwe, Eleanor Fisher, Christine Karungi et al.

Inês Boavida-Portugal

Zainabu Tumwebaze, Laura Orobia, Juma Bananuka et al.

This study aims to examine the contribution of participation costs (floatation costs, compliance costs and marketing costs) to stock market participation using evidence from Uganda—a developing country. Using a cross-sectional and correlational research design, data were collected through a questionnaire survey of 219 small and medium enterprises. We used correlation coefficients and linear regression to test our hypotheses. The hierarchical regression analysis results suggest that participation costs such as floatation costs, compliance costs, and marketing costs are significant predictors of stock market participation while firm age and firm size (control variables) are non-significant. The study uses a cross-sectional research design. The major weakness with cross-sectional research designs is that, it is difficult to monitor changes in behavior over time. To the practitioners and policymakers, this study suggests that the Ugandan Capital Market Authority should review the costs (floatation costs, compliance costs, and marketing costs) involved in accessing finance through the stock exchange. This will go a long way in making the stock market an alternative financing option, especially in this era of rising costs of capital provided by other financial intermediaries. The study examines the behavior of the elements of participation costs in explaining stock market participation, an aspect that has not been adequately highlighted in previous studies. Results indicate that among elements of participation costs, floatation costs are more significant, followed by compliance costs. Market costs turnout to be the least participation cost in explaining stock market participation.

Naveed Khan, Alessio Ishizaka, Andrea Genovese

The abrogation of Multifiber Arrangement in the year 2005 pushed many developing nations into tough competition. Within the textile industry, despite having many advantages apparel manufacturing and exporting organizations (AMEOs) in developing nations are experiencing decline in their supply chain supply chain performance. Developing a comprehensive model to explore and classify factors, which affect the supply chain performance, is extremely significant. Owing to limited research in this area, an exploratory qualitative study involving a variety of organizations in apparel supply chain was carried out, in combination with a literature review, to determine the causes behind that decline. The outcome of preliminary exploratory study and literature review aided in the proposal of a conceptual framework. Employing that framework, a questionnaire survey was designed and piloted to support a quantitative study, which was conducted in the Karachi region in Pakistan. Collected data were analyzed by employing structural equation modeling. Results indicate that a number of factors have a strong influence on the supply chain performance of AMEOs. Apart from contributing to the literature, this study can also be of interest to managers and practitioners from the textile industry, as it clearly indicates areas on which AMEOs need to focus in order to improve their performance.

de Lima Silva Paulo H., Naccache Mônica F., de Souza Mendes Paulo R. et al.

One of the main issues in the area of drilling and production in deep and ultra-deep water in the oil industry is the formation of natural gas hydrates. Hydrates are crystalline structures resembling ice, which are usually formed in conditions of high pressure and low temperature. Once these structures are formed, they can grow and agglomerate, forming plugs that can eventually completely or partially block the production lines, causing huge financial losses. To predict flow behavior of these fluids inside the production lines, it is necessary to understand their mechanical behavior. This work analyzes the rheological behavior of hydrates slurries formed by a mixture of water and Tetrahydrofuran (THF) under high pressure and low temperature conditions, close to the ones found in deep water oil exploration. The THF hydrates form similar structures as the hydrates originally formed in the water-in-oil emulsions in the presence of natural gas, at extreme conditions of high pressure and low temperature. The experiments revealed some important issues that need to be taken into account in the rheological measurements. The results obtained show that the hydrate slurry viscosity increases with pressure. Oscillatory tests showed that elasticity and yield stress also increase with pressure.

闻福岳, 卢昭禹, 曹均正 et al.

柔性直流输电换流阀所用的核心器件绝缘栅双极型晶体管（IGBT）的开关速度很快，IGBT开关过程中会产生强烈的电磁骚扰，加上雷击等瞬态骚扰，导致阀厅形成非常规的强电磁骚扰环境。子模块控制器作为子模块的控制和保护单元，属于低压信号设备，位于高压端子模块本体上，负责接收阀基控制器的开关指令和子模块本体的控制保护，因此电磁兼容（EMC）性能面临着严峻考验。为提升换流阀子模块控制器的EMC能力，对换流阀子模块周围电磁环境进行了仿真分析，并根据分析结果和相关标准，设定了控制器相关EMC试验参数，对控制器进行了针对性的电磁骚扰试验考核。系统分析并优化电路和试验方法，顺利通过浪涌抗扰度试验和射频场感应的传导骚扰抗扰度试验，并在实际工程应用中得到了验证。

乔铮, 郭庆来, 孙宏斌

随着燃气机组的广泛应用和电转气技术的快速发展，电力系统与天然气系统之间的互动日益密切，电力-天然气耦合系统是在该背景下形成的用于描述两个能源系统紧密耦合的系统形式。该耦合系统除了具有两个能源系统分别的运行特性和安全约束外，还因系统间的耦合互动产生了新的特点和约束，亟需新的分析和控制方法，近年来已经获得了国内外众多专家学者的关注和深入研究。文章从电力-天然气耦合系统的建模仿真、优化规划、运行分析（优化调度、安全评估）的角度对当前的主要研究成果进行了综述，同时总结了目前国内外学者对耦合市场的探索，最终对当前研究的不足和未来的研究方向进行了探讨。