NBI Technologies最新文献

{"title":"Study of Proton Migration on the Surface of Two-Dimensional Boron Carbon-Nitride","authors":"Evgeniya Boroznina, Aleksandr Shkodin, Anastasiya Zimina, Mikhail M. Belonenko","doi":"10.15688/nbit.jvolsu.2023.2.6","DOIUrl":"https://doi.org/10.15688/nbit.jvolsu.2023.2.6","url":null,"abstract":"One of the specific electrical properties of hexagonal two-dimensional boron carbon nitride (h-BCN) is proton conductivity, which solid electrolytes possess. Proton conductors are widely used as components of electrochemical devices such as gas sensors, electrolyzers, fuel cell membranes, etc. A key feature of the h-BCN layer is that it actually consists of a mixture of C-C carbon bonds and B-N boron nitride bonds. This makes it possible to change the conductive properties of the material by changing the concentration of the B-N bonds, which makes this material one of the most attractive to study at the moment. The adsorption of atomic hydrogen on the surface of a two-dimensional BCN layer is studied using density functional theory. The migration process of a single proton along the surface of a two-dimensional BCN layer has been studied, and the most probable path of its movement has been established. The density of states of a BCN layer with a proton on the surface is estimated. It is proved that the two-dimensional BCN layer is a promising material for using it as a functional element of devices with conductivity.","PeriodicalId":205855,"journal":{"name":"NBI Technologies","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139345892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of Influence of Carbon Nanotubes on Thermal Conductive Properties of Thermal Pastes","authors":"Denis Movchan, N. Boroznina, Alexander Tkachev","doi":"10.15688/nbit.jvolsu.2023.2.1","DOIUrl":"https://doi.org/10.15688/nbit.jvolsu.2023.2.1","url":null,"abstract":"Many industrial sectors require efficient heat transfer to ensure safe and efficient operation of equipment. Thermal pastes are materials used to improve heat transfer between different surfaces. Recently, carbon nanotubes (CNTs) have become widely used in the field of electronics and microelectronics due to their unique physical and chemical properties. One of the areas where CNTs can be applied is thermal conductivity. In this study, the effect of carbon nanotubes on the thermal conductive properties of thermal pastes was investigated. In this paper, an experiment was conducted to evaluate the thermal stability and performance improvement of thermal pastes by adding carbon nanotubes. KPT-8 thermal paste with a density of 2.6 g/cm2 and thermal conductivity of 0.7 W/mK was used in the experiment. Thermal pastes are materials used to improve heat transfer between different surfaces. The results of the study showed that thermal paste with CNT additives has higher thermal conductivity than thermal paste without additives. This indicates that CNTs can be effectively used as additives to improve the thermal conductivity of thermal pastes. But when CNTs are used as additives in thermal pastes, certain problems may arise, such as the grouping of CNTs in the mass of the substance. This can lead to an uneven distribution of CNTs in the thermal paste and, as a consequence, to inhomogeneous thermal conductivity. The results emphasize the potential of carbon nanotubes as a promising additive for improving the thermal conductive properties of thermal pastes in various applications.","PeriodicalId":205855,"journal":{"name":"NBI Technologies","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139345938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of the Possibility of Creating Composites Based on a Biopolymer Reinforced with Carbon Nanotubes for Their Use in Prostheses","authors":"Irina Zaporotskova, Vera Timnikova, Alena Popkova","doi":"10.15688/nbit.jvolsu.2023.2.4","DOIUrl":"https://doi.org/10.15688/nbit.jvolsu.2023.2.4","url":null,"abstract":"One of the main and fairly new materials for prosthetics are polymers. Among the most commonly used materials nowadays in the design and manufacture of prostheses are polyetheretherketones (PEEK), which have excellent stiffness and strength. They can be modified with fillers to improve their already impressive properties. This results in increased durability of the materials, so that prosthetic components remain strong and viable even after years of use. There are many ways to obtain structural materials with improved functional properties, one of which is the introduction of carbon nanotubes (CNTs) into the matrix of polymer composite material (PCM), which, having unique physical and chemical properties, modify the polymer-matrix for further use in special-purpose products. This paper presents the results of the study of the possibility of creating composites based on biopolymer polyetheretherketone reinforced with carbon nanotubes for their use as a material for prostheses that can be produced by 3D printing. The interaction of a single-layer carbon nanotube (6, 6) with a polyetheretherketone monomer and with a fragment consisting of four PEEK monomers was modeled and studied. One-center and two-center interactions have been studied. The calculations were performed within the framework of the quantum-chemical DFT method with different basis sets. The main interaction parameters were determined and the possibility of realizing the modification of the polymer by nanotubes was proved, which can serve as a stimulus for the creation of a new material that will have new unique properties for the creation of durable prosthetic limbs.","PeriodicalId":205855,"journal":{"name":"NBI Technologies","volume":"116 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139344925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Extremely Short Optical Pulses in a Medium of Oriented Carbon Nanotubes with Nonlinearities of Orders 3 and 5","authors":"I. Dvuzhilov, Y. Dvuzhilova, Mikhail M. Belonenko","doi":"10.15688/nbit.jvolsu.2023.2.2","DOIUrl":"https://doi.org/10.15688/nbit.jvolsu.2023.2.2","url":null,"abstract":"In the work, a theoretical study was carried out as well as numerical simulation of the interaction of three-dimensional extremely short pulses with an inhomogeneous array of oriented semiconductor carbon nanotubes, with polarization nonlinearities of 3 and 5 orders. The results of the temporal evolution of such pulses and the dependence of the pulse strength on the parameters of the inhomogeneity of an array of oriented nanotubes are shown. Extremely short pulses (ESP), in this case, mean optical pulses of high intensity, containing one to five periods of the electromagnetic field, with a duration of up to 100 ps. The pulse frequency lies in the near-infrared range. A necessary condition for the stable propagation of extremely short pulses is the presence of nonlinear effects that would make it possible to compensate for their dispersion and diffraction spreading. Therefore, an array of oriented carbon nanotubes (CNTs), which have nonlinear properties, was chosen as the pulse propagation medium. The use of nonlinear optical media can be used to create coherent radiation sources, light sources with variable frequency, etc.","PeriodicalId":205855,"journal":{"name":"NBI Technologies","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139346178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"About Metal Research in the Production of Automatic Technical Expertise","authors":"T. Kislova, K. Smirnov","doi":"10.15688/nbit.jvolsu.2022.3.6","DOIUrl":"https://doi.org/10.15688/nbit.jvolsu.2022.3.6","url":null,"abstract":"Quite often, traffic accidents occur due to a sudden failure of the steering, undercarriage or brake system of a car associated with the technical condition of vehicles. In this case, various parts of vehicles (steering, springs, wheels, couplers and braking system, etc.) are destroyed. However, destruction of these parts can also occur as a result of traffic accidents, for example, in a collision or rollover. Therefore, in cases of road accidents, an auto-technical examination is appointed. It is important for making an informed and objective decision on the case to clarify the reasons for the destruction of parts that affect the safety of the vehicle, and the establishment of the time for the occurrence of these malfunctions. Conducting a metallographic expertise, which in most cases is auxiliary, can significantly help the investigation and the court, when solving these issues. Its conclusions are supplemented and specified by the conclusions of another examination, for example, auto-technical. The paper outlines the scheme and stages of research of products made of metals and alloys performed by experts in the production of automotive expertise to establish a causal relationship between the technical condition of the vehicle and the mechanism of traffic accidents.","PeriodicalId":205855,"journal":{"name":"NBI Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124403931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative Analysis of Radio-Absorbing Coatings","authors":"O. Kakorina, I. Kakorin, Alexander Panchenko","doi":"10.15688/nbit.jvolsu.2022.3.4","DOIUrl":"https://doi.org/10.15688/nbit.jvolsu.2022.3.4","url":null,"abstract":"The development of information technologies necessitates the solution of various problems of information security. Physical means of protecting information processed by computer objects include radio-absorbing materials. They prevent the interception of information on electromagnetic radiation and interference in power supply and grounding lines. The general requirements for radar absorbent coatings are: a high level of attenuation of the reflected signal, a wide frequency range of operation and the cost-effectiveness of the structure during its manufacture and operation. The ability of a material to absorb high-frequency radiation depends on its composition and structure. The materials are quite diverse in their design and structure, and yet there are averaged performance indicators for the most established RPM groups. However, not every material can maintain performance under harsh external application conditions. The paper develops criteria for comparing the following radio-absorbing coatings: conductive paint (Shielding coating) with water-based silver Water Based Silver Conductive Coating MG Chemicals 842WB Super Shield™; Water Based Silver Coated Copper Conductive Coating MG Chemicals 843WB Super Shield™; Water Based Nickel Conductive Coating MG Chemicals 841WB Super Shield™. Their properties and advantages were investigated, and their comparative analysis was carried out on the basis of the selected criteria.","PeriodicalId":205855,"journal":{"name":"NBI Technologies","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129571720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research of Methods of Forecasting Attacks on Information Systems","authors":"N. Golovacheva, Nikita Andreichenko","doi":"10.15688/nbit.jvolsu.2022.3.2","DOIUrl":"https://doi.org/10.15688/nbit.jvolsu.2022.3.2","url":null,"abstract":"The article analyzes the methods of forecasting attacks on information systems. Within the framework of experimental studies, the best method for predicting attacks on information systems has been identified. At the present stage of society’s development, the problems of information security come to the fore in most areas of the company’s activities. This is due to a significant number of informatization projects currently being implemented. Most of them are aimed at building a unified information space in order to optimize the processing of large volumes of various kinds of information, including ensuring its reliable storage and prompt access for participants of information exchange. Priority tasks in this direction are: identification, analysis and classification of existing mechanisms for the implementation of threats to information security; assessment of possible damage; identification of basic measures to counter threats; elimination of vulnerabilities; development of security criteria and protection mechanisms. One of the means of solving these problems is the detection of computer attacks. Malicious impacts on information systems can be presented in the form of network attacks. A network attack is an intentional action by third parties aimed at establishing control over a local or remote computer or computer system. As a result of attacks, attackers can disrupt the network, change account rights, receive users’ personal data and implement other goals. Network attacks by the nature of the impact on the network can be divided into active and passive. The active ones affect the network, which may cause the network to malfunction, or modification of its settings. This type of exposure leaves traces in the network, which is why it is immediately calculated that it will be detected. A passive attack is carried out without affecting the network. But her work violates network security. It is much more difficult to detect it than the active one due to the lack of direct intervention. Basically, the purpose of the attack is unauthorized access to protected information, distorting it or intercepting it. In the first case, the data is changed, in the second, access is performed without interfering with the data structure.","PeriodicalId":205855,"journal":{"name":"NBI Technologies","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121504026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analytical Overview of Metrics Used to Assess the Quality of Multimedia Information","authors":"Nina Kerentseva, Aleksandr Trofimov","doi":"10.15688/nbit.jvolsu.2022.3.5","DOIUrl":"https://doi.org/10.15688/nbit.jvolsu.2022.3.5","url":null,"abstract":"Data quality is an indicator that characterizes any transmitted information that can be measured. The very word “measure” suggests the evaluation of these data, the quality of which can be described and quantified. The metric, in turn, is essentially an objective assessment during testing, which makes it possible to determine data distortions that occur during transmission, encoding, digitization, compression, and decoding of video data. The article considers such metrics as PSNR and VQM, and analyzes the ITU-R-BT.500-8.11 standard. A brief overview of the MSU Video Quality Measurement Tool is presented, as well as a simulated video conferencing image acquisition using one of the most popular H264 codecs. The formulas for calculating the PSNR metric, defined through the mean square error (MSE), estimating the loss of image quality by comparing the received video with the downloaded (reference video) are presented. The VQM (Video Quality Metric) metric is considered, which evaluates the distortion in the transmitted video caused by the passage of network packets through the cable line of the transmission system (decoding errors or coding errors), as well as methods for subjective and objective evaluation of images in video conferencing. The advantages and disadvantages of each of the evaluation methods are considered.","PeriodicalId":205855,"journal":{"name":"NBI Technologies","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115167255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Information Technologies in Forensic Examination: Modern Methods of Creating a Facial Composite","authors":"N. Boroznina, Roman Shinkarev, S. Boroznin, P. Zaporotskov","doi":"10.15688/nbit.jvolsu.2022.3.1","DOIUrl":"https://doi.org/10.15688/nbit.jvolsu.2022.3.1","url":null,"abstract":"Contrary to the existing international and domestic experience in the field of criminology and in identifying a person by the signs of a person’s appearance, an urgent problem in the detection and investigation of crimes remains the identification of criminals, as well as other persons involved in illegal actions. In 2015, Russia adopted a new state security plan, which includes: improving scientific and technical support to law enforcement agencies, systematic development of law enforcement agencies and other services, obtaining special equipment and funds. One of such technical means just includes programs for creating a facial composite aimed at creating and highlighting the characteristic features of a person associated with illegal actions. This software allows not only to create portraits of suspects in the commission of crimes, missing people, but also to predict external changes in the appearance of the suspect. In this article, the most common and effective software options for the creation of composite portraits used in law enforcement agencies of Russia and abroad are presented. Such programs make an important contribution to the activities of law enforcement agencies.","PeriodicalId":205855,"journal":{"name":"NBI Technologies","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130924019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of Methods of Evaluating Quality of Transmitted Signal in Communication Channel","authors":"Nadezhda Ermakova, D. Tyukhtyaev, E. Semenov","doi":"10.15688/nbit.jvolsu.2022.3.3","DOIUrl":"https://doi.org/10.15688/nbit.jvolsu.2022.3.3","url":null,"abstract":"There are many different measurement methods and methods, thanks to which digital models of the system are analyzed for noise immunity, distortion, security, versatility, cost-effectiveness and accuracy. The concept of “universality” is general in nature and applied to any digital signal, the concept of “cost-effectiveness” is the efficient use of bandwidth, equipment and network resources. “Accuracy” is the key requirement in the construction and transmission of information over a communication network. Various characteristics of the transmission channel - bandwidth, transmission levels, dynamic range, level diagram, amplitude-frequency response, phase-frequency response, the error rate for a certain time interval give an idea of the state of the channel, path, and equipment. According to their analysis, it is easy to eliminate or improve that component of the communication channel. The article presents and investigates popular tools for assessing the quality of transmitted information over a digital communication channel. The MATLAB Simulink software environment was used, a digital communication channel was modeled using QPSK modulation. The MATLAB Simulink software environment was used, a digital communication channel was modeled using QPSK modulation. This modulation is actively used in satellite broadcasting, when streaming satellite channels SD and some HD channels, works at high transmission speeds, thereby being one of their most popular at the moment. An experiment of signal transmission over a communication channel was carried out; the received signal was evaluated in various ways for noise immunity and distortion.","PeriodicalId":205855,"journal":{"name":"NBI Technologies","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123407472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}