Journal of Optoelectronics Laser

A Hybrid Coupler With A Wide-Band Using Modified Schiffman Phase Shifter

Anshu Gaur, Navneet Kumar Agrawal — Wed, 10 May 2023 00:00:00 +0000

A novel design of hybrid coupler with widebandhaving threeports is presented in this paper which mainly includes of a wide band phase shifter with power-divider, along with redesigned coupled line shows a designed model working at 1 GHz to 2.6 GHz with wideband bandwidth. According to simulated results, the coupler shows bandwidth of 88% with -12 dB return loss and 90o ±5 phase shifting which is approximately 0.5 dB separates the imbalance in amplitude among the two ports at output. As a result, the suggested coupler is ideally suited for wideband circularly polarized antenna feeding system.

Lightweight Pumice Aggregate Concrete Strength Enhanced Using Fibers

Shakir A. Khudair and Mohammed A. Basher — Sat, 13 May 2023 00:00:00 +0000

Pumice Aggregate Concrete (PAC) has significant properties with low density and thermal resistance. Strength of this type of concrete enhanced with fiber added. Steel and polypropylene fibers were added to pumice aggregate concrete with various proportions to improve the strength of concrete. Five mixes selected to enhanced with fibers. Steel fibers were added with 0.5, 0.75 and 1% and 0.2 and 0.4 of Polypropylene fiber to the five mixes selected. Mechanical properties of produced concrete are considered. Results presented the strength enhanced with steel fibers in compressive strength, splitting, flexural strength and modules of elasticity.

Supporting Entrepreneurship Development, The Impact Investment Way

Malobika Bose*, Dr Sheeba Khalid & Dr Naela Jamal Rushdi — Sat, 13 May 2023 00:00:00 +0000

The paper aims to explore the concept of impact investment and its viability in the present economic conditions across the globe. Business houses have been constantly battling for profits over cost to environment and society and often the environment and society lose in this conflict. Once the importance of sustainable development was realized, it became imperative that businesses must contribute to the sustainable development of the economies to integrate itself with the society and environment, thus creating ‘blended value.’ Over time investors have become more aware of the power they hold over businesses as investors and have started to refrain from investing in businesses or activities with socially and environmentally negative effects. This has led to socially responsible investment and created the concept of impact investment. Entrepreneurship development in emerging economies is need of the hour and first crowdfunding and now impact investing is paving the way for entrepreneurs to secure venture financing in non-traditional ways and aligning their businesses with the United Nations Sustainable Development Goals. The paper will further draw a comparison between impact investment and crowd funding as a source of entrepreneurial finance (since crowdfunding also works on projects and ventures of social impact) while discussing the pros and cons of selecting either of the funding modes and which types of projects are best suited for crowdfunding and impact investing.

Strategies for Improving Efficiency and Protecting the Environment with Water Resource Management

Prof. Dr. Gözen ELKIRAN, Fidan ASLANOVA, John Kepo KPEWOAN II — Tue, 23 May 2023 00:00:00 +0000

Globally, water resources are a major concern. The valuable water resources of Liberia, which are crucial to the ecosystem of the nation, are under severe threat as a result of both the availability and use of water, rapid urbanization, industrialization, population growth, and low environmental awareness. Monitoring and evaluating these resources is urgently required since they provide crucial data for managing water resources and making sustainable decisions. The rising urbanization of Liberia has resulted in a widening urban-urban gap. The idea that metropolitan areas in Africa are always advantageous was called into doubt. The goal of the paper is to highlight water resource management strategies for increasing effectiveness and preserving the environment. The study's objective was accomplished by comparing water efficiency by examining strategies for improvement of water efficiency and protecting the environment water resource management.

A Review of the Detrimental Impacts of Pollution on Our Natural Environment

Momoh Ndorbor MASON JR*, Fidan ASLANOVA & Gözen ELKIRAN — Tue, 23 May 2023 00:00:00 +0000

Environmental pollution is a serious global issue that demands the same level of attention that climate change is currently receiving. Pollution is defined as the introduction into the environment of substances harmful to humans and other living organisms. Pollutants are harmful solids, liquids, or gases produced in higher than usual concentrations that reduce the quality of our environment. Air pollution is caused by the burning of coal to provide electricity. Sewage and trash from homes and businesses can contaminate both land and water. Pesticides have an effect on animals because they poison vegetation and insects and then seep into water sources. Many attempts have been made to reduce pollution, but it still poses a significant threat to human health and in most instances traditional sources of pollution, such as industrial emissions, lackluster sanitary infrastructure, ineffective waste management, polluted water supplies, and indoor air pollution from biomass fuels, are arguably more severe in less industrialized and developing nations.

Human-caused Pollutants in the environment, such as the burning of fossil fuels, have altered global weather patterns and accelerated the onset of climate change. As a direct result of this occurrence, there has been a worldwide increase in efforts to reduce environmental contamination. There has been a lot of study on how pollution in the environment impacts our natural ecology. In this review, we draw on the findings of other academic studies that have examined the problem of environmental pollution at various scales and therefore we aimed at doing an overview of the disastrous consequences pollution generated by people is having on our natural environment, with a specific focus on air pollution.

Research on personal data security: Personal Gmail use case and its concerns regarding data breaches

Tran Khai Minh Phap — Thu, 25 May 2023 00:00:00 +0000

In today's digital age, personal data security has become a critical concern for individuals, particularly when it comes to the use of email services. This research paper aims to investigate the personal data security risks associated with the use of Gmail, one of the most widely used email platforms. The study begins by providing an overview of the increasing importance of personal data security and the vulnerabilities that exist within email communication. It explores the potential consequences of data breaches, including identity theft, financial fraud, and privacy invasion. The specific focus is placed on Gmail due to its widespread usage and the vast amount of personal information that users store within their accounts. A combination of quantitative and qualitative methods is employed to conduct the research. Firstly, an extensive literature review is conducted to gather insights into the existing research and best practices in personal data security. This includes examining academic papers, industry reports, and relevant legal frameworks. Secondly, a survey is administered to a sample of Gmail users to gather their perceptions, experiences, and concerns regarding personal data security. The survey data is then analyzed using statistical techniques to identify trends, patterns, and common vulnerabilities. Furthermore, the research investigates the security features and measures implemented by Google, the company behind Gmail, to protect user data. This includes an analysis of encryption protocols, authentication mechanisms, and data storage practices. Additionally, the study examines the privacy policies and terms of service associated with Gmail to determine the extent to which user data is protected and the rights and control users have over their information. The findings of the research highlight the potential risks and vulnerabilities associated with personal Gmail use. It identifies common security lapses such as weak passwords, phishing attacks, and unauthorized access. The research also sheds light on user behavior and perceptions, including their understanding of data security risks and their willingness to adopt security measures. Based on the research findings, recommendations are provided to enhance personal data security for Gmail users. These recommendations encompass technological solutions, such as two-factor authentication and encryption, and user education and awareness campaigns to promote responsible online behavior. Overall, this research contributes to the understanding of personal data security within the context of Gmail users. It provides valuable insights into the risks and challenges that users face and potential strategies to mitigate them. By raising awareness and proposing actionable recommendations, this study aims to empower individuals to protect their data while using Gmail and contribute to the broader field of personal data security research.

Research on the current situation and applying technology for learning Japanese vocabulary regarding to Japanese vocabulary learning methods

Nguyen Thi Ha Chau — Thu, 25 May 2023 00:00:00 +0000

In Vietnam, Japanese is a language that many people choose to study and explore because of its unique, but Japanese has always been considered a difficult language to approach because of its diversity of the alphabet, learners face many difficulties in the learning and research process. Along with the increasing demand for learning Japanese, finding quick and easy learning solutions should have many ways to learn vocabulary, but in order to be able to memorize, understand deeply and use vocabulary effectively and reasonably, is not easy. This article presents the current situation of Japanese vocabulary learning of students of the Faculty of Japanese Studies - FPT University in Ho Chi Minh City, and offers new methods of learning Japanese vocabulary to make learning more interesting and diverse. A type of learning method for students who are learning Japanese and those who are deeply studying Japanese

Managing Urban Wastewater for Maximizing Water Resource Utilization

Daniel Lormutor KPANGBAI* & Prof. Dr. Gozen ELKIRAN — Fri, 26 May 2023 00:00:00 +0000

In order to supplement the natural groundwater supply, the Atlantis Water Supply Management Scheme makes use of artificial recharge, which consists of urban runoff and treated wastewater. The key to the success of the plan is the fractionation of the stormwater into components of markedly different quality, as well as the separate treatment of household and industrial wastewater for various end-uses. Both of these steps are necessary to ensure the programme is a success. To a significant extent, the approach for extracting groundwater is determined by the quality standards that must be met. In order to have a improved empathetic of the impacts of backwater and sewer water excellence on therapeutics recital, ecological concerns, and resource consummation, extensive studies grounded on geometric facts gathered from 3,340 borough wastewater action facilities in China were carried out. As a consequence of this, there is a particular alleviation from the engagement of supply and demand for water resources, and large gains in the economic efficiency of the local economy have been simulated using numerical results. The model for the most efficient use of water and the preservation of the natural world is provided by the environmentally responsible management of the water resource programme.