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  Analysis of Consumer Sentiment and Problems in Online Shopping

  This study analyses consumer sentiment and the main sources of dissatisfaction in online shopping by examining 1,254 independent customer reviews of Amazon published on Trustpilot between October 2025 and January 2026. The paper applies lexicon-based sentiment analysis (VADER), correlation and regression analysis, and topic modelling ... This study analyses consumer sentiment and the main sources of dissatisfaction in online shopping by examining 1,254 independent customer reviews of Amazon published on Trustpilot between October 2025 and January 2026. The paper applies lexicon-based sentiment analysis (VADER), correlation and regression analysis, and topic modelling (LDA). Opinions are polarised: 54.63% of reviews carry negative sentiment, 41.95% positive and 3.43% neutral. About half express a categorical attitude, while the rest contain mixed or restrained assessments. The relationship between the composite sentiment score and the rating is moderate and positive (r = 0.413), so the text and the stars convey similar but not identical information. One third of one-star reviews receive a positive composite score, which marks the limits of the lexicon-based approach. Controlling for the reviewer's country leaves this relationship almost unchanged, while the ratings themselves differ systematically across countries. The topic analysis identifies five areas. Reviews about delivery to the address and about contacting customer service carry the most negative sentiment, while those about returns and refunds have the lowest average rating. Together these three areas cover 57.18% of the reviews and concern stages that follow the order. The findings direct attention to the last mile of delivery and to problem resolution after purchase.

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  Thermonuclear Fusion – the Future of Global Energy

  Fusion is a physical process in which light atomic nuclei combine to form heavier nuclei, releasing significant amounts of energy. In the face of ever-increasing global energy consumption, depletion of fossil fuel reserves, and the growing need to limit carbon emissions, fusion is increasingly seen as one of the most promising options for the ... Fusion is a physical process in which light atomic nuclei combine to form heavier nuclei, releasing significant amounts of energy. In the face of ever-increasing global energy consumption, depletion of fossil fuel reserves, and the growing need to limit carbon emissions, fusion is increasingly seen as one of the most promising options for the future development of the global energy sector. Despite a well-established theoretical understanding of the process, the practical implementation of controlled fusion remains an extremely complex scientific and technological problem. The purpose of this article is to examine the principles of fusion, to review modern approaches and large-scale experimental projects aimed at its implementation, as well as to make an economic justification for investments and to analyze the main challenges for its future development as a sustainable energy source.

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  A Study of the Relationship Between Corporate Sustainability Initiatives and Staff Motivation, Satisfaction, Engagement and Retention

  This study is designed as quantitative research aimed at confirming or rejecting the existence of a positive relationship between the implementation of sustainability initiatives at the business organization level and employee satisfaction, motivation, engagement, and retention. The study is based on data collected through a self-selection ... This study is designed as quantitative research aimed at confirming or rejecting the existence of a positive relationship between the implementation of sustainability initiatives at the business organization level and employee satisfaction, motivation, engagement, and retention. The study is based on data collected through a self-selection sampling approach, using descriptive statistical methods for analysis. The findings show that the majority of respondents perceive corporate sustainability initiatives as having a positive impact on their satisfaction (H1), motivation (H2), engagement (H3), and retention (H4). These results align with previous research and highlight the importance of sustainability efforts in enhancing key employee attitudes. Despite certain limitations, such as the self-selection sampling and the subjective nature of self-reported data, the study provides valuable insights into the impact of sustainability initiatives on employees in Bulgaria. Future research could further explore these relationships using more representative samples and advanced statistical techniques.