Distributed acoustic sensing (DAS) using fiber-optic cables as sensors has become a standard measurement technique in many industrialized settings. Geophysical applications have been mainly commercialized the borehole environment. When deployed on seabed (SB), horizontal analysis of DAS data poses new challenges due to particularity receiver response and characteristics data. Recent acquisition 2D towed-streamer (TS) survey following path communication cable (installed 1998), which is...

Three schemes of second-order low-pass filters on switched-capacitors are analyzed. The investigated differ in the ideology their construction, but at same time they have one property uniting them - possibility tuning pole frequency. specified is provided by changing parameter only element resistance a resistor or capacitance capacitor, which significant advantage comparison with other this class. novelty such circuit solutions has been confirmed patents. It shown that considered sensitivity...

Acoustic FWI has been widely applied in seismic exploration. Nevertheless, acoustic results could be negatively affected by the presence of elastic effects, although data is dominated compressional waves and phenomena are less evident certain cases than others, depending on geological scenarios type acquired. These effects commonly manifest themselves as variations amplitude phase across offset. In this study we address technical challenges associated with building a high resolution velocity...

The article describes the investigation process of possibilities XSS–attacks, and development counteraction means to these attacks. Researches were determined whether XSS–attack can be fulfilled successfully, vulnerability detection methods applied; developed logical structural diagrams XSS–vulnerability program; realized program implementation (software) algorithms for detecting XSS–vulnerabilities on Web – sites. software is extension Google Chrome browser. Main purpose implementing this...

The application features of digital potentiometers as controlled elements for the tasks setting active RC-filters in structure communication systems analog interface and automatic control are considered. research paper is based on a selected method parameters circuits with providing necessary precision ranges. sections contain examples oriented potentiometers.

A new structure of the third order low-pass RC-filter (ARCF-III) designed for practical use as a spectrum limiter at input various analog-to-digital converters A/D Interface instrumentation and control system is considered. It shown that in proposed ARCF-III high guaranteed attenuation amplitude-frequency characteristic provided outside operating band. Three modifications are developed its implementation based on differential difference operational amplifiers. Analytical expressions defining...

A method is proposed for increasing the guaranteed attenuation of amplitude-frequency characteristic active RC filter (ARCF) processing piezoelectric signals sensors outside band-pass desired signal. This effect provided by balanced differential input ARCF and original circuit design its basic functional units. The results computer simulation experimental research in structure measuring system machine dynamic rotors are given, which show that modified enable to improve metrological...

The generalized structure of the second-order RC filters (LPF, HPF, BPF) with independent setting basic parameters - pole frequency, Q-factor and transfer ratio is considered. From these positions, requirements for three special functions (TF) multipole frequency-setting circuit, which contains two resistors capacitors, are formulated. type required filter implemented by selecting coefficients numerator first TF. second TF chosen so that they only affect frequency. In this case, choice third...

A new structure of the active RC low-pass filter (LPF) is proposed. This scheme recommended as a second-order link in more complicated antialiasing filters and spectrum limiters input circuits analog-to-digital converters. It shown that under consideration an independent trimming main characteristics, such pole frequency, attenuation, DC current transfer ratio, provided.

A new structure of the active RC highpass filter (HPF) is proposed. It shown that in HPF under consideration an independent trimming main characteristics, such as a pole frequency, attenuation, and transfer ratio bandwidth, provided. This scheme recommended second-order link more complicated HPF.

In modern conditions, one of the important areas development a higher educational institution is automation activities through implementation complex information system. order to increase effectiveness simultaneous management various aspects activity, system should combine wide range functionality, including timetable scheduling module. This paper dealing with issues most significant university administrative processes - scheduling. module support working big data and have appropriate...

To solve the problem of constructing amplitude response switched-capacitor filters, which belong to class electronic circuits with a periodically changing structure, techniques for their simulation in Micro-Cap environment are suggested. They make possible evaluate nature change shape frequency characteristic such filters time domain. As an example, comparative analysis analog second-order bandpass filter, as well two filter switched resistors and capacitors, is given.

To eliminate the unwanted spectral components in processed signals automatic control and monitoring systems, most often low-pass (LPFs) band-pass filters (BPFs) are used. They performed on basis of analog (continuous) circuits, as well analog-to-discrete (switched capacitors) digital ones by means software or hardware implementation. In such information delay causes a dynamic component their error. The error is part total system it reduces permissible velocity its operation. article...

Three new modifications of second-order low-frequency discrete analog filters (DAFs) based on switched capacitors have been developed and studied. A distinctive feature the DAFs under consideration is presence two resistors in general feedback circuit. This allows, at constant values capacitances frequency-setting a fixed switching frequency electronic switches, to control DAF pole by changing resistance ratio these resistors. The basic equations for low-pass filter gain zero frequency, as...

To suppress interference in the communication lines of measuring and medical system sensors most modern rejection filters (RF) use active adders based on operational amplifiers (OA). This imposes restrictions applied element base RF frequency range. The analysis existing ARC Sallen-Key family revealed disadvantages implemented only non-inverting voltage repeaters. article suggests new architectures RC RLC class followers, which have property to adjust independently main parameters by...

We have considered a modified architecture of the third order low-frequency filter (LFF), intended to be applied as an anti-alias on inputs analog-digital converters (ADC's) with differential input. obtained conditions for filter's circuit parametrical synthesis. shown results suggested LFF simulation and compared its amplitude-frequency characteristics (AFC's) at different frequencies operational amplifiers' (OP-AMP's) unity gain (AD8132, THS4131).

The results of comparative preoperative cytological and postoperative histological investigation 3714 patients with thyroid nodules are presented. causes discrepancies discussed measures their diminution proposed. Great value fine needle biopsy to differ but follicular neoplasia into benign malignant determined. Its sensitivity in our clinics is 98.7% specificity – 100%. Necessity the second FNA if first one non informative established.

Abstract A new high-pass filter (HPF) circuit of the second-order Sallen-Key family has been developed and studied, in which independent adjustment main parameters is realized -the pole frequency, quality factor transmission coefficient. The basic equations for transfer functions HPF are presented. results computer simulation a proposed circuits CAD Micro-Cap 12 shown.

A bank of circuit design solutions for active RC filters the second order is considered - alow-pass filter, a high-pass filter and band-pass filters, in which independent tuning mainparameters pole frequency, quality factor transmission coefficient isprovided. From these positions, requirements three special transfer functions multipolefrequency-setting circuit, contains two resistors capacitors, are formulated.By choosing coefficients numerator first function, type requiredfilter (LPF, HPF,...

New modifications of the active RC-filter with a differential input and output, which provide high signal attenuation outside band-pass range (38-496 Hz) designed to process signals piezoelectric sensors, are presented. The basic equations developed circuit given their simulation is performed in Micro-Cap application package on OP27 AD8132 models operational amplifiers.

This report discusses Shor’s quantum factorization algorithm and ρ–Pollard’s algorithm. consists of classical parts. In the part, it is proposed to use Euclidean algorithm, find greatest common divisor (GCD), but now exist large number modern algorithms for finding GCD. Results calculations 8 were considered, among which with lowest execution rate task was identified, allowed as whole work faster, in turn provides greater potential practical application Standard upgraded by replacing binary...