No abstract

The first ever search for α decays to the first excited state in Yb was performed for six isotopes of hafnium (174, 176, 177, 178, 179, 180) using a high purity Hf-sample of natural isotopic abundance with a mass of 179.8 g. For 179 Hf, also α decay to the ground state of 175 Yb was searched for thanks to the β-instability of the daughter nuclide 175 Yb. The measurements were conducted using an ultra low-background HPGe-detector system located 225 m underground. After 75 d of data taking no decays were detected but lower bounds for the half-lives of the decays were derived on the level of lim T 1/2 ∼ 10 15 − 10 18 a. The decay with the shortest half-life based on theoretical calculation is the decay of 174 Hf to the first 2 + 84.3 keV excited level of 170 Yb. The experimental lower bound was found to be T 1/2 ≥ 3.3 × 10 15 a.

AUTHORS AbstractThis analytical study focuses on the financing of energy efficiency projects in Ukraine. In this article, the authors analyze the state and dynamics of the modern market of energy resources both on a global scale and within Ukraine, and it was discovered that the potential of the energy efficiency market is extremely large and interesting for different groups of bank investors. In the course of the study, it was revealed that private households and industrial enterprises are the largest energy consumers in Ukraine, which confirms the necessity of implementing a public program for financing energy efficiency projects. The study of Ukraine's legislative framework has made it possible to clearly define the concept of energy efficiency and to highlight which projects can be considered energy-efficient. It is noted that the state actively develops and implements a policy to increase energy consumption savings both among private individuals and among producing enterprises, which is implemented at the state level by a specially created Energy Efficiency Fund. As a specific tool for analyzing energy efficiency projects, the authors suggest using benchmarking technology, which provides the opportunity to highlight the strengths and weaknesses of a specific energy saving project, as compared to the top project in the industry. As a result, in the course of the conducted analytical studies, the authors proposed a specific tool for the analysis of energy efficiency financing projects in Ukraine, which includes five priority areas for which it is necessary to build a methodology for assessing the borrower's creditworthiness, which seeks to implement a project in the field of energy saving.

Motivation: We note significant problems of developing countries, including Ukraine, with the adaptation of organizational and economic mechanisms of the construction industry to increase impact of digital technologies on their economic systems and construction sectors. Novelty: The scientific novelty is a set of management activities for the adaptation of organizational and economic mechanisms of Ukrainian construction companies to the development of digital technologies. Methodology and Methods: The research methods used in this study are a quantitative analysis of statistics on the dynamics of world GDP, the global construction industry, the construction industries of developing countries, including Ukraine, the global digital market, digital markets in developing countries, including Ukraine, for ten years using onedimensional statistical methods (UT) based on random sampling. The paper also uses the correlation and regression analysis, namely the linear regression model, as well as the statistical verification of the obtained model by calculating the pair correlation coefficient, the coefficient of determination and the Chaddock scale in the study of the impact of digital technology development on the Ukrainian construction industry. Data and Empirical Analysis: To conduct the study, data were collected and an empirical analysis was conducted regarding the dynamics of world GDP, the world construction industry, the construction industries of developing countries, including Ukraine, the global digital market, digital markets in developing countries,