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This paper investigates the levels of career resilience and self-efficacy of the principals of primary school units, identifies the relationship between them and determines the effect of the demographic elements of the sample on their career resilience and self-efficacy.

The convenient sample of this study was 165 principals from public schools across the prefecture of Central Macedonia. A total of 422 questionnaires were mailed to all principals of kindergarten and elementary schools, accompanied by a personal letter to inform them about the procedure and the purpose of the survey. A pilot survey took place to check the adequacy of and get feedback on the questionnaire. The questionnaire used in the study consisted of three parts: The Career Resilience Scale (CRS) by Kodama (2015), the Principal Self-Efficacy Scale (PSES) by Tschannen-Moran and Gareis (2004) and demographic questions.

The results of the survey showed that principals have high levels of career resilience and very high levels of self-efficacy. There are four factors that form the levels of career resilience: (a) problem-solving skills (b) social skills (c) interest in innovation and (d) optimism for the future. Demographic factors play a role in shaping career resilience as they affect two of the four factors. There are two factors that shape levels of self-efficacy: (a) self-efficiency in administration and (b) self-efficiency in moral leadership. Demographic factors play a role in shaping the factor of self-efficacy that refers to administration. Finally, there was a high positive correlation and a causal relationship between career resilience and self-efficacy.

The convenient sample used in the present study is a limiting factor, as it may not be representative of Greek primary school principals. Also, research is based on self-evaluation questionnaires, which may show a lack of objectivity, as the answers may reflect the personal worldviews of leaders and particular needs of educational institutions (Sarid, 2021). This fact may not allow us to generalize the results.

The present study showed that resilience and self-efficacy have a causal relationship and that one enhances another, making their relation pivotal for a successful educational leadership. Regarding the professional development of school leaders, educational leadership training programs could be designed and offered by the Greek Ministry of Education (Dexter et al., 2020). Coaching programs and practices that help principals develop social skills, coping mechanisms, emotional capacities and confidence in one's knowledge should be widely introduced. Governments have to take the necessary initiative to ensure that, particularly in adverse contexts, education stimulate and nurture resilience and self-efficacy among citizens, by promoting appropriate lifelong learning programs and by ensuring the continuous training of employees (Renko et al., 2020).

Career resilience and self-efficacy ensures economic prosperity in times of crisis, globalization and rapid technology development and may be the best way to create strong and successful leaders. Coaching programs and practices that help principals develop social skills, coping mechanisms, emotional capacities and confidence in one's knowledge should be widely introduced. The results of the present research could prove helpful in developing strategic plans, building networks between organizations to improve communication and flow of information, through employee exchange programs.

This research, which combined career resilience and self-efficacy, took place for the first time in Greece. The CRS by Kodama (2015) was also used for the first time in Greek population.

In this paper, we aim to provide an extensive analysis to understand how various factors influence electricity prices in competitive markets, focusing on the day-ahead electricity market in Romania.

Our study period began in January 2019, before the COVID-19 pandemic, and continued for several months after the onset of the war in Ukraine. During this time, we also consider other challenges like reduced market competitiveness, droughts and water scarcity. Our initial dataset comprises diverse variables: prices of essential energy sources (like gas and oil), Danube River water levels (indicating hydrological conditions), economic indicators (such as inflation and interest rates), total energy consumption and production in Romania and a breakdown of energy generation by source (coal, gas, hydro, oil, nuclear and renewable energy sources) from various data sources. Additionally, we included carbon certificate prices and data on electricity import, export and other related variables. This dataset was collected via application programming interface (API) and web scraping, and then synchronized by date and hour.

We discover that the competitiveness significantly affected electricity prices in Romania. Furthermore, our study of electricity price trends and their determinants revealed indicators of economic health in 2019 and 2020. However, from 2021 onwards, signs of a potential economic crisis began to emerge, characterized by changes in the normal relationships between prices and quantities, among other factors. Thus, our analysis suggests that electricity prices could serve as a predictive index for economic crises. Overall, the Granger causality findings from 2019 to 2022 offer valuable insights into the factors driving energy market dynamics in Romania, highlighting the importance of economic policies, fuel costs and environmental regulations in shaping these dynamics.

We combine principal component analysis (PCA) to reduce the dataset’s dimensionality. Following this, we use continuous wavelet transform (CWT) to explore frequency-domain relationships between electricity price and quantity in the day-ahead market (DAM) and the components derived from PCA. Our research also delves into the competitiveness level in the DAM from January 2019 to August 2022, analyzing the Herfindahl-Hirschman index (HHI).

Globally, cancer represents an increasing proportion of child mortality as progress against infectious causes is made. Approximately 400,000 children will develop cancer, each year, around the world. Only about half of these cancers will ever be diagnosed. In high-resource settings, 80% of children will survive, but only about 30% will survive in low-resource settings. Digital solutions have a valuable role in increasing health professional knowledge, skills and empowerment to diagnose, treat and otherwise care for children and adolescents with cancer. This review sought to identify digital resources that support the training and development of the paediatric oncology workforce in resource -poor settings.

This paper presents a narrative descriptive review of peer-reviewed publications and digital platforms that contribute to health professionals' education and training regarding paediatric oncology, particularly in rural and other low-resource settings.

Digital solutions were identified for building communities of practice, facilitating access to information and support and providing access to training, education and supervision specifically for paediatric oncology health professionals. A total of 33 resources are discussed in depth. A quality assessment of the digital resources is provided using the Currency, Relevance, Authority, Accuracy and Purpose (CRAAP) tool and suggestions to improve the quality of resources are discussed.

The authors anticipate that this summary of digital resources for the global paediatric oncology professional community will inform digital health investments and design of digital innovations to meet emerging needs and will have an impact on the workforce in the real world. Ultimately, this work will contribute to an improvement in the diagnosis and treatment of children and adolescents with cancer in resource-poor settings.

This is the first discussion and summary of digital education platforms which educate, train and offer support to health professionals with respect to paediatric oncology. These digital platforms are often aimed at, and are essential for, health professionals in rural and other low-resource settings.

The purpose of this paper is to evaluate the possibility of a new biocatalyst prepared by kefir cells immobilization on grape stalks (GS) to reduce quickly and efficiently the Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) of the waste whey during its fermentation producing potable ethanol.

Many batch whey fermentations were carried out in order the effect of various conditions (pH, temperature) on 14C-labeled lactose uptake rate by the GS-immobilized kefir cells and consequently on fermentation rate as well as on ethanol production and whey BOD and COD reduction to be determined.

It has been illustrated that GS-biocatalyst was suitable for whey BOD and COD reduction by about 32 and 25 percent, respectively during whey alcoholic fermentation at 30°C and pH 5.5 in only ten hours, producing about 3.30 percent w/v of ethanol.

The findings of this research may enhance the existing literature on whey exploitation, for the first time focussing on the use of cheap and abundant GS as support for kefir immobilization during whey fermentation, which is potentially acceptable by industries in order to reduce fast and easily the whey polluting load and produce ethanol.

First, the authors analyze the key problems faced by the protection of digital library readers' data privacy and behavior privacy. Second, the authors introduce the characteristics of all kinds of existing approaches to privacy protection and their application limitations in the protection of readers' data privacy and behavior privacy. Lastly, the authors compare the advantages and disadvantages of each kind of existing approaches in terms of security, efficiency, accuracy and practicality and analyze the challenges faced by the protection of digital library reader privacy.

In this paper, the authors review a number of research achievements relevant to privacy protection and analyze and evaluate the application limitations of them in the reader privacy protection of a digital library, consequently, establishing the constraints that an ideal approach to library reader privacy protection should meet, so as to provide references for the follow-up research of the problem.

As a result, the authors conclude that an ideal approach to reader privacy protection should be able to comprehensively improve the security of all kinds of readers' privacy information on the untrusted server-side as a whole, under the premise of not changing the architecture, efficiency, accuracy and practicality of a digital library system.

Along with the rapid development of new network technologies, such as cloud computing, the server-side of a digital library is becoming more and more untrustworthy, thereby, posing a serious threat to the privacy of library readers. In fact, the problem of reader privacy has become one of the important obstacles to the further development and application of digital libraries.