We have written polarization reflection holograms in an azobenzene-containing material. Two waves with circular polarization were used to record the gratings; the light resulting from their overlap induces chirality in the samples. The holographic reflection of the polarization gratings has the properties of Bragg reflection in cholesteric liquid crystals.

The problem of constructing equidistant codes over an alphabet of an arbitrary size qis considered. Some combinatorial constructions and computer-based search methods are presented. All maximal...

Businesses and institutions often need to monitor digital innovations and stay competitive and up-to-date. New digital media is developing and influencing the environment fast, raising also topics like accessibility, data storage and protection, automatic and artificial intelligence processes. Understanding and using better new digital media and tools for companies and society also includes processes such as management, measuring, evaluating and analysing the effectiveness and usefulness of brand marketing and presence in new digital media. The research shows results of survey among experts for using new digital media in marketing strategies of companies. The paper also presents basic facilitating metrics and measurement tools used in the training process of digital marketing specialists.

The article examines issues of web accessibility ecosystems for people with special needs. Methods, models, accessibility standards, and technologies related to the structure, design, and functionality of the web accessibility ecosystem are studied. The stages of developing an accessibility ecosystem are explored. The accessibility of the design, functionalities, structure, and content of a particular ecosystem are presented. Several themes for the design of the system with an emphasis on its accessibility for blind users are explored and analyzed. UX/UI design and the ontological model of accessibility, used in the implementation of the model of the ecosystem and its elements, are studied. A web accessibility ecosystem model has been developed, compliant with the Web Content Accessibility Guidelines and based on semantic technologies. Other qualities of this model are easy access to information resources on the topic of accessibility, convenience for users with different needs, and the possibility of expansion and enrichment in the future.

Monitoring of the health of bee colonies, their efficiency and activity and nectar flow are essential for beekeepers. Such information could be obtained by using innovative technologies and systems. Such technologies are increasingly used in different types of agriculture, including beekeeping. To monitor the aforementioned parameters, smart electronic scales measuring the weight of the hive and sending the data to a server platform are most often used. The aim of this paper is to present a configurable system enabling long-term autonomous operation, monitoring the status of bee colonies and environmental conditions. The system consists of electronic scales and additional modules.

The Internet of Things (IoT) maintains its pivotal role in the overall structure of information and communication technologies and societal growth. The goal of this research is to determine the opportunity for IoT usage in education as well as to optimize its advantages and to encourage students to use it in their education. The research demonstrates usage and implementation of IoT in education. It describes how the IoT, and its services and equipment are implemented and how they are used during the teaching process in lower schools, high schools, and universities. The findings of this research will benefit educational institutions and their employees in general, as well as students in particular.