scholarly journals EXPERIMENTAL STUDIES OF THE STAND OF SIMULATION MODELING OF LASER MICROPHONE OPERATION FOR REMOVAL OF ACOUSTIC INFORMATION

2021 ◽  
Vol 2 (14) ◽  
pp. 131-147
Author(s):  
Maksym Martseniuk ◽  
Pavlo Skladannyi ◽  
Volodymyr Astapenya
Keyword(s):  
Acoustic Signal ◽  
Membrane Surface ◽  
Experimental Studies ◽  
Information Leakage ◽  
Research Process ◽  
Technical Intelligence ◽  
Variable Nature ◽  
Signal Amplifier ◽  
Management And Development ◽  
Types Of Information

He who possesses information owns the world. This statement is becoming more relevant every day. It is information that has become a tool for modern management and development. Therefore, the role of information technology is also constantly growing along with the risk of their malicious use. Attackers use all possible methods and means of technical intelligence to use potentially possible and create new types of information leakage channels to intercept it. object of information activities. Such oscillations caused by a certain speech (acoustic) signal can be intercepted by means of long-range intelligence. Most often, a laser microphone is used as such. The essence of its action is to emit a laser on the surface of the selected OID, which circulates a speech signal that creates sound vibrations on this surface. The movement of the surface leads to the modulation of the wave by phase, which is manifested in the variable nature of the sound signal Doppler shift of the frequency of the received signal. Often, such a surface is the glass of the windows, which reflects the beam to the receiver, to which is connected a detector that can reproduce the sound from the OID. This study aims to study the dependence of the laser microphone on such factors as: the location of the radiation source and the beam receiver from the membrane; membrane surface material; receiver type; materials of fencing constructions OID. The goal is to create a stand to demonstrate the operation of a laser microphone. The research process is carried out on a smaller scale, which is why an improvised room in the form of a cardboard box was chosen as the OID. Available tools were used to reproduce the operation of the laser microphone, so a laser pointer was chosen as the illuminator, and devices such as a solar panel, a light sensor and a signal amplifier microphone were used as the receiver. The study of the influence of selected factors was performed by measuring the voltage and volume of the acoustic signal using a multimeter and a certified program on the tablet, respectively.

scholarly journals EXPERIMENTAL INVESTIGATIONS OF THE INFLUENCE OF SCREENS AND PROTECTIVE EQUIPMENT ON THE LEVEL OF ACOUSTIC SIGNAL IN A ROOM WITH GLASS AND METAL PLASTIC

2021 ◽  
Vol 12 (4) ◽  
pp. 117-131
Author(s):  
Volodymyr Astapenia ◽  
Maksym Martseniuk ◽  
Svitlana Shevchenko ◽  
Pavlo Skladannyi ◽  
Yevhen Martseniuk
Keyword(s):  
Acoustic Signal ◽  
Information Leakage ◽  
Public Institutions ◽  
Experimental Investigations ◽  
Acoustic Oscillations ◽  
Acoustic Information ◽  
Information Activity ◽  
Technical Intelligence ◽  
Constant Change ◽  
Information Circulation

In the digital stage of world development, information is constantly expanding its facets. That is why the exchange of information is a leading component of constant change in life. Although humanity is gradually moving to the use of electronic technology, acoustic information still plays a key role in information circulation. This applies to official communication in public institutions up to the highest level, business contacts in commercial structures and private communication between people. The process of transmitting information in acoustic form has dangerous consequences. The use of appropriate devices, such as directional acoustic microphones or technical intelligence acoustic antennas, which may be outside the scope of the information activity, makes it possible to obtain unauthorized information that should not reach third parties. Therefore, the task of detecting and protecting information leakage channels, including acoustic ones, is gaining a new degree of importance every day. The protection of the premises or building, where acoustic information regularly circulates, provides a set of organizational and technical measures and means of protection of information circulation, taking into account the peculiarities of the location and arrangement of the object. This study involves the study of the dependence of the level of the acoustic signal on ways to prevent leakage of information through the acoustic channel, which includes vibration noise by means of technical protection and coverage of improvised materials (shielding) of enclosing structures of information activities (OID). The experiment determines the degree of influence of density, sound-absorbing properties of materials and their combinations on acoustic oscillations, the source of which is in the OID. The object of the study was a basic room, where the enclosing structures are walls with windows and doors, ceiling and floor. It is also worth noting that the acoustic signal measurements were not performed in complete silence, which directly affected the accuracy of the results. This step was taken in order to best reproduce the conditions in which criminals often work.

scholarly journals Computational Molecular Modeling of Transport Processes in Nanoporous Membranes

Processes ◽  
2018 ◽  
Vol 6 (8) ◽  
pp. 124 ◽  
Author(s):  
Kevin Hinkle ◽  
Xiaoyu Wang ◽  
Xuehong Gu ◽  
Cynthia Jameson ◽  
Sohail Murad
Keyword(s):  
Molecular Modeling ◽  
Temporal Resolution ◽  
High Performance ◽  
Low Cost ◽  
Membrane Surface ◽  
Experimental Studies ◽  
Nanoporous Materials ◽  
Transport Processes ◽  
Zeolite Membrane ◽  
Nanoporous Membranes

In this report we have discussed the important role of molecular modeling, especially the use of the molecular dynamics method, in investigating transport processes in nanoporous materials such as membranes. With the availability of high performance computers, molecular modeling can now be used to study rather complex systems at a fraction of the cost or time requirements of experimental studies. Molecular modeling techniques have the advantage of being able to access spatial and temporal resolution which are difficult to reach in experimental studies. For example, sub-Angstrom level spatial resolution is very accessible as is sub-femtosecond temporal resolution. Due to these advantages, simulation can play two important roles: Firstly because of the increased spatial and temporal resolution, it can help understand phenomena not well understood. As an example, we discuss the study of reverse osmosis processes. Before simulations were used it was thought the separation of water from salt was purely a coulombic phenomenon. However, by applying molecular simulation techniques, it was clearly demonstrated that the solvation of ions made the separation in effect a steric separation and it was the flux which was strongly affected by the coulombic interactions between water and the membrane surface. Additionally, because of their relatively low cost and quick turnaround (by using multiple processor systems now increasingly available) simulations can be a useful screening tool to identify membranes for a potential application. To this end, we have described our studies in determining the most suitable zeolite membrane for redox flow battery applications. As computing facilities become more widely available and new computational methods are developed, we believe molecular modeling will become a key tool in the study of transport processes in nanoporous materials.

scholarly journals Share to Seek: The Effects of Disease Complexity on Health Information Seeking Behavior (Preprint)

2020 ◽  
Author(s):  
Ashwag Alasmari ◽  
Lina Zhou
Keyword(s):  
Health Information ◽  
Information Seeking ◽  
Information Needs ◽  
Qualitative Content Analysis ◽  
Experimental Studies ◽  
Mixed Data ◽  
Disease Development ◽  
Health Information Seeking ◽  
Alternative Source ◽  
Types Of Information

BACKGROUND Online Questioning and Answering (Q&A) sites have emerged as an alternative source for serving individuals’ health information needs. Despite the amount of studies concerning the analysis of user-generated content in online Q&A sites, there is an insufficient understanding of the effect of disease complexity on information seeking needs, and the types of information shared, and little research have been devoted to questions that involve multimorbidity. OBJECTIVE This study aims to investigate online sharing of health information at different levels of disease complexity. In particular, this study gains a deep insight into the effect of disease complexity in terms of information seeking needs, types of information shared, and stages of disease development. METHODS We first selected a random sample of 400 questions from each site. The data cleaning resulted in a final set of 624 questions, 316 questions from Yahoo Answers and 308 from WebMD Answers. We used a mixed data approach, including qualitative content analysis followed by statistical quantitative analysis. RESULTS The analysis of variance One Way ANOVA showed significant differences in the disease complexity (single versus multimorbid disease questions) only on two information seeking needs: diagnosis (F1, 622 =5.08, p=0.00), and treatment (F1, 622 =4.82, p=0.00). There were also statistically significant differences between the two levels of disease complexity when considering the stages of disease development, the general health stage (F1,622 =48.02, p=0.00) and chronic stage (F1,622 =54.01, p=0.00). Moreover, our findings showed significant differences among the two types of disease complexity on all types of shared information, demographic information (F1,622 =32.24, p=0.00), medical all (F1,622 = 16.75, p=0.00), medical diagnosis (F1,622 =11.04, p=0.00), as well as treatment and prevention (F1,622 =14.55, p=0.00). CONCLUSIONS The findings present implications for designing online Q&A sites to better support health information seeking. Future experimental studies should be conducted to verify these findings and provide effective health information from Q&A sites. CLINICALTRIAL

Numerical and Experimental Evaluation of a Dual-Fuel Dry-Low-NOx Micromix Combustor for Industrial Gas Turbine Applications

2018 ◽  
Vol 11 (1) ◽  
Author(s):  
Harald H. W. Funke ◽  
Nils Beckmann ◽  
Jan Keinz ◽  
Sylvester Abanteriba
Keyword(s):  
Gas Turbine ◽  
Combustion Process ◽  
Experimental Studies ◽  
Research Process ◽  
Operating Conditions ◽  
Experimental Investigations ◽  
Dual Fuel ◽  
Pure Hydrogen ◽  
Ongoing Research ◽  
Industrial Gas Turbine

Abstract The dry-low-NOx (DLN) micromix combustion technology has been developed originally as a low emission alternative for industrial gas turbine combustors fueled with hydrogen. Currently, the ongoing research process targets flexible fuel operation with hydrogen and syngas fuel. The nonpremixed combustion process features jet-in-crossflow-mixing of fuel and oxidizer and combustion through multiple miniaturized flames. The miniaturization of the flames leads to a significant reduction of NOx emissions due to the very short residence time of reactants in the flame. The paper presents the results of a numerical and experimental combustor test campaign. It is conducted as part of an integration study for a dual-fuel (H2 and H2/CO 90/10 vol %) micromix (MMX) combustion chamber prototype for application under full scale, pressurized gas turbine conditions in the auxiliary power unit Honeywell Garrett GTCP 36-300. In the presented experimental studies, the integration-optimized dual-fuel MMX combustor geometry is tested at atmospheric pressure over a range of gas turbine operating conditions with hydrogen and syngas fuel. The experimental investigations are supported by numerical combustion and flow simulations. For validation, the results of experimental exhaust gas analyses are applied. Despite the significantly differing fuel characteristics between pure hydrogen and hydrogen-rich syngas, the evaluated dual-fuel MMX prototype shows a significant low NOx performance and high combustion efficiency. The combustor features an increased energy density that benefits manufacturing complexity and costs.

scholarly journals THE STUDY OF THE METHOD OF FIGHT AGAINST FORMATION OF POLARIZING LAYER AT THE PROCESS OF ULTRAFILTRATION CONCENTRATION OF THE SKIM MILK

2016 ◽  
Vol 5 ◽  
pp. 53-60
Author(s):  
Grygoriy Deynychenko ◽  
Vasyl Guzenko ◽  
Oleg Udovenko ◽  
Aleksandr Omelchenko ◽  
Olga Melnik
Keyword(s):  
Mathematical Models ◽  
Membrane Surface ◽  
Experimental Studies ◽  
Skim Milk ◽  
Factorial Experiment ◽  
Raw Material ◽  
Technological Parameters ◽  
Membrane Processing ◽  
Working Parameters ◽  
Selection Of

The description of experimental set and the method of processing of the results of the study of the method of fight against formation of polarizing layer in the process of ultrafiltration concentration of skim milk raw material were presented. The results of experimental studies relative to the sparging method application for the prevention of polarizing layer in the process of membrane processing of the skim milk and its influence on the capacity of ultrafiltration membranes were offered. The mathematical models were constructed on the base of regressive equations of factorial experiment using the method of the raw material sparging above the membrane surface for selection of technological parameters of the process of ultrafiltration concentration of the skim milk. The rational working parameters of the process of ultrafiltration concentration of the skim milk using the sparging of the skim milk by the gas bubbles in the direct closeness to the membrane surface were determined. Such working parameters are: pressure– 0,4...0,5 MPa, temperature of skim milk– 40...50 ºС, frequency of sparging of skim milk– 0,10...0,15 min-1, pressure of sparging must be 0,56...0,58 MPa.

scholarly journals Directions for the development of the existing concept of assessing the relevance of information leakage through technical channels in the current trends of improving technical intelligence

2021 ◽  
Vol 31 (1) ◽  
pp. 74-83
Author(s):  
S. V. Skryl ◽  
M. P. Sychev ◽  
A. V. Mazin ◽  
T. V. Meshcheryakova ◽  
O. A. Gulyaev ◽  
...  
Keyword(s):  
Electromagnetic Radiation ◽  
Information Leakage ◽  
Aviation Industry ◽  
Aircraft Industry ◽  
Technical Intelligence ◽  
Current Trends ◽  
Manufactured Products ◽  
Electromagnetic Emissions ◽  
Production Technologies ◽  
Practical Implications

Problem statement. The rationale for confidentiality requirements in the process of manufacturing and production testing of aviation equipment samples. There is a need to assess the effectiveness of measures to prevent information leakage through the channels of incidental electromagnetic radiation and interference and vibroacoustic channels. This situation is characteristic both for the technological equipment of the aviation industry enterprises and the equipment of the produced aircraft models.Objective. The rationale for developing the existing concept of assessing the relevance of the threats of information leakage through technical channels in the current trends of improving technical reconnaissance.Results. The article presents the analysis results of the existing regulatory and existing base of FSTEC Russia for sufficient assessment of measures to prevent information leakage through the channels of incidental electromagnetic radiation and interference and vibroacoustic channels at the enterprises of the aircraft industry in the implementation of production technologies and testing of manufactured products.Practical implications. The substantiated directions of improving the methodological basis for determining the current threats can be used in the development of methods and models for assessment of measures to prevent information leakage through the channels of electromagnetic emissions and interference and vibroacoustic channels at aircraft industry enterprises in the implementation of production technologies and testing of manufactured products.

scholarly journals The use of membrane technologies in boiler houses of heat and power enterprises

2019 ◽  
Vol 110 ◽  
pp. 02056
Author(s):  
Elena Kuvardina ◽  
Natalia Semicheva ◽  
Nikolay Kuvardin ◽  
Valery Tolmacheva ◽  
Vasily Amelin
Keyword(s):  
Concentration Polarization ◽  
Membrane Surface ◽  
Experimental Studies ◽  
Low Frequency ◽  
Frequency Range ◽  
Working Process ◽  
Water Stream ◽  
Vibration Effect ◽  
Slowing Down ◽  
Membrane Technologies

The article is about the use of membrane technologies in water treatment cycle for boiler houses which use water of superficial reservoirs for operation. Working process of a flat membrane element is described in the article. Movement scheme of purified water streams is introduced. The layer of undesirable deposits which are slowing down membrane operation is formed on membrane surface during its operation. This formed layer is a result of the arising concentration polarization. Impact of low-frequency fluctuations on saturation water stream is offered to decrease concentration polarization which leads to decline in production of membrane devices. Fluctuations were brought in a stream by means of the vibrator. Steady standing waves are in the membrane device as a result of vibration effect. These waves reduce the formation of undesirable deposits layer on a membrane surface. Results received by mathematical modeling and confirmed by experimental studies state that process productivity of ultrafiltration increased by 30% in frequency range of 60-70 Hz. Frequency range is in standing wave.

Experimental studies of the deformation and breakup of a synthetic capsule in steady and unsteady simple shear flow

1993 ◽  
Vol 250 ◽  
pp. 609-633 ◽  
Author(s):  
K. S. Chang ◽  
W. L. Olbricht
Keyword(s):  
Elastic Modulus ◽  
Couette Flow ◽  
Membrane Surface ◽  
Experimental Studies ◽  
Small Deformation ◽  
Local Deformation ◽  
Polymeric Membrane ◽  
Simple Shear Flow ◽  
Freely Suspended ◽  
Theory Yield

An experimental study is reported of the motion, deformation, and breakup of a synthetic capsule that is freely suspended in Couette flow. The capsule is a liquid drop surrounded by a thin polymeric membrane. The shape and orientation of the capsule are measured in steady flow and following the start-up of Couette flow. Results are compared with predictions of the small-deformation theory of Barthes-Biesel and co-workers. The data suggest that the capsule membrane is viscoelastic, and comparisons with theory yield values of the membrane elastic modulus and the membrane viscosity. The values of the elastic modulus of the capsule membrane deduced from the flow data are compared with independent measurements for the same capsule.When the flow-induced deformation becomes sufficiently large, the capsules break. Breakup begins at points on the membrane surface near the principal strain axis of the undisturbed flow. By examining the local deformation within the membrane, it is shown that breakup is correlated with local thinning of the membrane and is initiated at points where the thickness is a minimum.

scholarly journals La colegialidad docente en la escuela primaria mexicana: Análisis de sus prácticas

2017 ◽  
Vol 21 (2) ◽  
pp. 1
Author(s):  
Efren Martínez-Cruz ◽  
Tiburcio Moreno-Olivos
Keyword(s):  
Teacher Collaboration ◽  
Participant Observation ◽  
Research Process ◽  
Structured Interview ◽  
Teaching Staff ◽  
Education Management ◽  
Global Dynamic ◽  
Types Of Information ◽  
Management Staff ◽  
Study Modality

Teaching collegiality in the Mexican primary school is influenced by a global dynamic that forms a complex school culture, with singular educational practices that have been established over time. A qualitative investigation of ethnographic character was conducted by using the case study modality. The case consisted of 13 professionals in charge of the primary education management. The techniques used to collect data were participant observation, semi-structured interview and analysis of documents. Through an inductive research process, empirical categories of analysis were constructed to finally produce an interpretative text that identified some practices of teacher collaboration; these practices are described and analyzed in this article. Among the main findings, it was identified that what motivates the teaching staff to collaborate with others has to do with resolving practical and immediate situations with preciseness; so, the school can continue to function with «a sense of normality». It was also confirmed that the time for teaching collegiality is not scheduled; then, the teachers often consume their students’ recess time, and even the management staff extends that time to develop different meetings related to providing several types of information.

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