Some Completely Monotonic Properties for the (p, g)-Gamma Function

MSC 2010: 33B15, 26A51, 26A4

Diagnostic of laser produced plasmas and investigation of laser-solid interactions using x-ray diffraction from bent crystals

This thesis is composed of two parts. The objective of the first part was to investigate the influence of the intermediately coupled plasma environment on the radiating hydrogen-like aluminium ions by using high resolution, high dispersion vertical geometry Johann spectrometer. Benefiting from the high spectral and spatial resolution of the spectrometer as well as from optimized sandwich-target geometry, the influence of the ionization potential lowering and the influence of electron-plasma waves in the emission spectra are observed. These results have both practical and theoretical importance. Practical, because some signatures observed in the emission spectrum lead to a new density diagnostic, and, theoretical, because they can be used to test different theoretical formulations of radiator-plasma interactions. The second part of the thesis reports about the quantitative investigations of atomic motions in semiconducting samarium mono-sulphide (SmS) using optical pumping and X-ray probing. Coherent acoustic phonon propagation in semiconducting SmS is observed. The observed acoustic phonons have frequencies up to about 0.08 THz. The time resolved diffraction data are in good agreement with theoretical predictions for coherent phonon excitation, demonstrating that, up to the laser fluence of about 10 mJ/cm2 SmS behaves as a standard semiconductor, i.e., a semiconductor which (at the laser fluences used) shows no interplay between valence fluctuations and lattice vibrations

Logarithmically completely monotonic functions involving the Generalized Gamma Function

By a simple approach, two classes of functions involving generalization Euler's gamma function and originating from certain  problems of traffic flow are proved to be logarithmically  completely monotonic and a class of functions involving the psi function is showed to be completely monotonic

On the way to remote sensing of alpha radiation: radioluminescence of pitchblende samples

In the framework of the project RemoteALPHA, an optical scanning system for remote sensing of alpha emitters using radioluminescence is being developed. After the feasibility of the technique was proven, current work aims at improving the sensitivity for detection of low surface activities. As calibration standard, pitchblende minerals were prepared. Their surface count rate of 80 Bq cm-2 to 105 Bq cm-2 was measured by alpha-track-detection and alpha-spectroscopy. Subsequently, radioluminescence measurements were performed in a sealed chamber filled with different gas atmospheres. The radioluminescence signal was measured in UVC and UVA spectral ranges for all samples

Standoff UV-C imaging of alpha particle emitters

Alpha particles are proven to be very useful in many areas of medicine, technology and science. Yet, they represent the biggest risk to soft biological tissues compared to all nuclear decay products when ingested or inhaled, implying thus stringent radiation protection measures in the management and monitoring of samples that emit them. In this paper we present a standoff optical imaging approach that enables sensing of a radiological threat items at facilities where alpha-emitting material is manufactured, handled, used and stored, at safe distances without putting personnel at risk or contaminating equipment. The optical imaging of alpha-emitting samples is based on the radiation induced air luminescence (radioluminescence) in the UV-C (solar-blind) spectral region which enables detection of alpha particles even under bright light conditions. We show that by adding trace amounts of nitric oxide into the nitrogen atmosphere surrounding the sample, alpha sources with specific activities as low as 1.5 Bq/cm(2) can be remotely imaged. This work provides a proof-of-concept implementation of a novel imaging approach that not only enhances capabilities of a state to take actions which effectively mitigate consequences of an radiological emergency for the society, health, environment and economy, but also benefits nuclear industry in decommissioning efforts.Peer reviewe

Investigation into the performance of dose rate measurement instruments used in non-governmental networks

In the aftermath of a nuclear or radiological accident, an extended mapping of reliable dose rate values is of key importance for any governmental decision and countermeasures. Presently, numerous dosimetry network stations, operated by the national governments of the member states in Europe, provide such dose rate data on an hourly basis. Nevertheless, there are large areas in Europe that are not covered at all by these early warning networks and other areas that show only a low density of governmental network stations. Hence, there may be a significant lack of information in case of a nuclear or radiological emergency. As a consequence of the Fukushima Daiichi nuclear power plant accidents in 2011, a number of non-governmental radiation monitoring networks (NRMN) appeared on the internet, providing dose rate data based on stationary as well as on mobile measurements of ionizing radiation by laypersons. Especially the mobile detectors are able to cover large areas in short time. Therefore, it is of considerable importance to investigate the feasibility of using dose rate data from non-governmental networks as a complementary input to the European Radiological Data Exchange Platform (EURDEP). Within the European Metrology Program for Innovation and Research (EMPIR), the project 16ENV04 “Preparedness” has studied the metrological relevance of such non-governmental dose rate data (also called crowd-sourced radiological monitoring) in the most comprehensive way so far. Sixteen different dose rate detector systems (in general 4 of each type, plus 2 types with 2 detectors, i.e. 68 detectors in total) used in NRMN have been investigated for the reliability of their data and the corresponding networks, and their data provision to the public were analyzed. The most relevant performance parameters of dosimetry systems (detector's inherent background, energy dependence and linearity of the response as well as the response to secondary cosmic radiation, the sensitivity to small increases of the dose rate and finally the stability of the detector's indication at various climatic conditions - temperature and humidity) have been investigated for fourteen representative types of non-governmental dose rate measuring instruments. Results of this comprehensive performance study of the simple, light-weighted and cheap dose rate meters used in NRMN, and conclusions on the feasibility of using their data for governmental monitoring in case of a nuclear or radiological emergency are presented. © 2021 The Author

Internet of things(IOT) in education: Opportunities and Challenges

Nowadays, the Internet has become an indispensable part of life, Internet of Things (IoT) devices are growing rapidly in many aspects by allowing the connection and remote control of a network infrastructure that makes human life more convenient and easier. The trend of IoT in education has started to prevail, which leads to the need to design suitable educational activities. A widely adopted educational model that responds to this demand is the STEAM education model. The Internet of Things (IoT) has the potential to transform education by profoundly changing the way schools, colleges, and universities collect data, interface with users, and automate processes. IoT refers to the networking of physical objects through the use of embedded sensors, actuators, and other devices that can collect and transmit information about campus activity in real time. When IoT is combined with technologies such as user mobility and data analytics, it brings a new paradigm to education. This research aims to gather evidence and document the Internet of Things (IoT) in education and the main aim is to elaborate on the opportunities and challenges of IoT in education

World Journal of Gastroenterology ISSN 1007-9327

doi:10.3748/wjg.14.593