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We present the results of a study of the dielectric and electrical properties of macroscopic reduced graphene oxide paper (RGOP) before and after 1 MeV electron irradiation with a low dose of 1⋅1016 cm−2. It was found that the Coulomb interaction affects the transport of charge carriers and causes their strong localization within graphene domains. The conductivity of the RGOP can be described by the charge carrier tunneling through a disordered graphene quantum dot array. It was shown that charge carrier localization length decreases from 5–8 nm to 1–2 nm after electron irradiation. Structural and electrical studies revealed that the irradiated sample demonstrates electrical conductivity higher than the initial one, despite the lower sp2-carbon fraction, the lower localization length, unchanged average size of graphene domains, and the higher defect states and functional groups content. The improvement in conductivity is also accompanied by an increase in the dielectric permittivity ɛ from 5 for the initial RGOP to 35 after electron irradiation. The data obtained indicate that disordered regions can affect the electrical properties of reduced graphene oxide.

During fish farming, significant attention should be paid not only to the quantity, but also to the quality of marketable carp, primarily its physiological condition and high adaptive plasticity. Recently, increasing importance is attached to fish farming by industrial methods using various types of feed. A characteristic feature is the almost complete absence of natural food organisms. Significant success has been achieved in the creation of various starter compound feeds that can replace live feed when the larvae switch to exogenous nutrition [1]. During the development of artificial rations, attention was paid to the balance of basic structural elements of nutrition and, to a lesser extent, to various biologically active substances. For the majority of farmed fish, the need for protein and essential amino acids, fat and certain fatty acids, carbon and minerals has been established, on the basis of which, starter and production feeds, as well as various vitamin and mineral premixes, were developed [2]. However, natural food contains a wider range of biologically active components that are the regulators of many metabolic processes of body. Therefore, live food in fish nutrition, even in small proportion, can supplement the energy components of artificial feed and thereby significantly increase the balance of the diet [3]. Keywords: aquaculture, probiotic, exterior, aquatic organisms, bacteria, fatness ratio, diet

The advance of industrialization regarding the optimization of production to obtain greater productivity and consequently generate more profits has led to the emergence of Industry 4.0, which aims to create an environment called smart manufacturing. On the other hand, the Internet of Things is a global network of interrelated physical devices, such as sensors, actuators, intelligent applications, computers, mechanical machines, objects, and people, becoming an essential part of the Internet. These devices are data sources that provide abundant information on manufacturing processes in an industrial environment. A concern of this type of system is processing large sets of data and generating knowledge. These challenges often raise concerns about security, more specifically cybersecurity. Good cybersecurity practices make it possible to avoid damage to production lines and information. With the growing increase in threats in terms of security, this paper aims to carry out a review of existing technologies about cybersecurity in intelligent manufacturing and an introduction to the architecture of the IoT and smart manufacturing.

The accelerated changes on our planet have led to a growing interest in climate change and its consequences: natural hazards and adverse socio-economic impacts. However, the development of climate research and the proliferation of datasets require an integrated and efficient approach to the analysis, investigation, and visualization of atmospheric meteorological data. Thus, we propose a literature review of existing systems viewing meteorological phenomena in four and three dimensions. Moreover, we evaluate meteorological occurrences to better understand the dynamics associated with a meteorological phenomenon and visualize different weather data. Based on the investigation of tools and methods, we consider the existence of different ways of representing meteorological data and methodologies. However, it was imperative to obtain knowledge and create our way of visualizing weather data. This article found eleven existing solutions for 4D meteorological visualization and meteorological phenomena.

The impact of Sn on the degradation of the nonequilibrium charge carriers lifetime (τ) and the change of free electrons concentration (n) in γ- or electron irradiated Czochralski (Cz) n-Si has been studied. It is shown that in some cases the low-resistivity Sn doped n-Si (n-Si:Sn) can be considered as a material with enhancement radiation tolerance. In this material the lifetime damage factor (kτ) is in several times smaller compared to undoped n-Si while the conductivity damage factor (kn) is close in both materials. We also compared the impact of Sn, Pb and Sn+Pb. It is found that the radiation damage of the carrier lifetime and the conductivity in n-Si:Pb is slightly smaller than in undoped n-Si and in n-Si:Sn+Pb is the same as in n-Si:Sn.