scholarly journals MODELING OF SYNCHRONIZATION OF QUASI-RANDOM AFTERMATH OF A LARGE PERIOD IN CONDITIONS OF EXTERNAL DESTRUCTIVE INFLUENCES

Globus ◽  
2021 ◽  
Vol 7 (6(63)) ◽  
pp. 16-22
Author(s):  
Evgeny Viktorovich Melnikov ◽  
Oleg Sergeevich Avsentyev
Keyword(s):  
High Speed ◽  
Random Sequence ◽  
Test Segment ◽  
Large Period ◽  
Radio Systems ◽  
Analysis Interval

A boundary assessment of the probability of non-acceptance of the test segment when synchronizing the quasi-random sequence of a large period of digital high-speed radio systems in conditions of destructive influences, taking into account all the test segments at the analysis interval in order to increase the probability of phasing of the KSPBP sensors, has been developed.

Experimental Evaluation of Blasting Near Pipelines

2018 ◽  
Author(s):  
Justin Gossard ◽  
Steven A. Waters ◽  
Shane Finneran
Keyword(s):  
High Speed ◽  
Laser Scanning ◽  
Field Experiments ◽  
Separation Distance ◽  
Primary Objective ◽  
Operating Conditions ◽  
Soil Conditions ◽  
Exterior Surface ◽  
High Speed Video ◽  
Test Segment

Construction blasting was proposed as a technique to create a trench for a new pipeline within the right-of-way (ROW) of an existing vintage pipeline where soil conditions consisted primarily of rock. Several field experiments were conducted to assess the potential loading conditions that the vintage pipeline could experience due to various blasting configurations as part of the nearby construction process. Two test pipe segments were constructed from segments removed from the vintage pipeline for use in these experiments. Each test segment contained two vintage bell-bell chill ring girth welds (GW) and were pressurized to operating conditions of the vintage pipeline for the duration of all blasting. Groups of eight resistive strain gages were bonded around the exterior surface of three distinct locations on each test segment. The three locations include one pipe body location and each of the two welds on each segment. Four separate experiments were conducted with each experiment focusing on a unique combination of trench backfill material, compaction level and separation distance from the test pipe segments and the explosive charges. The primary objective throughout these four experiments was to monitor and record the behavior of buried test pipe sections due to nearby blasting activities. Long range 3-dimentional (3D) laser scanning equipment was used to track movement of each test segment from test to test. High-speed video equipment was also employed to capture each blast. The high-speed video provided additional details on the blast energy transfer, verification of individual charge initiation as well as pipeline test segment movement where each pipeline segment was exposed. Peak particle velocity measurements were taken during each test blast. Strain data collected during each test was used to assess potential damage to the vintage pipeline test segments as a result of blasting. The combined information collected from the in-field testing showed that elevated strains and stresses may be observed during blasting activities near pipelines.

scholarly journals Optimal Topology Formation and Adaptation of Integrated Access and Backhaul Networks

2021 ◽  
Vol 1 ◽  
Author(s):  
Meryem Simsek ◽  
Murali Narasimha ◽  
Oner Orhan ◽  
Hosein Nikopour ◽  
Wei Mao ◽  
...  
Keyword(s):  
Cellular Networks ◽  
High Speed ◽  
Random Sequence ◽  
Multiple Input Multiple Output ◽  
Optimal Solution ◽  
Network Capacity ◽  
Base Stations ◽  
Optimal Topology ◽  
Wireless Backhaul ◽  
Topology Formation

With the increasing densification of cellular networks, it has become exceedingly difficult to provide traditional fiber backhaul access to each cell site, which is especially true for small cell base stations (SBSs). The increasing maturity of millimeter wave (mmWave) communication coupled with multiple-input-multiple-output (MIMO) and beamforming technologies has opened up the possibility of providing high-speed wireless backhaul to such cell sites. The third-generation partnership project (3GPP) is defining an integrated access and backhaul (IAB) architecture for the fifth-generation (5G) cellular networks, in which the same infrastructure and spectral resources are used for both the access and the backhaul. In IAB networks, SBSs, so-called IAB nodes, act either as relay nodes carrying the traffic through multiple hops from a macrocell to an end user and vice versa or as access points to serve user equipments (UEs) in their proximity. To this end, the topology of such IAB networks is essential to enable efficient traffic flow and minimize congestion or increase robustness to backhaul link failure. In this paper, we propose a topology formation algorithm together with methodologies to implement it in real networks and compare it with a standard random sequence approach as well as with an optimal topology obtained using dynamic programming. Our simulation results demonstrate that the proposed algorithm outperforms the random sequence approach by 26% on average in terms of lower bound of the network capacity and is up to 99.7% close to the optimal solution, while being significantly less complex.

A Study on Subgrade Pressure Differential Over Regions of Known Substructure Transition as it Relates to Track Geometry

2017 ◽  
Author(s):  
Joseph W. Palese ◽  
Allan M. Zarembski ◽  
Christopher M. Hartsough ◽  
Hugh Thompson ◽  
Michael E. Palese
Keyword(s):  
High Speed ◽  
Real Life ◽  
Time Correlation ◽  
Numerical Techniques ◽  
Support Structure ◽  
High Speed Rail ◽  
Track Geometry ◽  
Test Segment ◽  
Degradation Rates ◽  
Over Time

The support structure beneath railroad tracks may appear to be a simple layering of various materials, but rather, it is a complex system working together to distribute the load of passing trains. It is paramount that this structure maintain its designed support properties not only to preserve component life expectancy but to maintain the safety of the trains traveling over the rails. During normal operations, track geometry, as evaluated through the standard deviation of various track geometry channels, tends to degrade over time. This is a byproduct of the cyclical loading applied to the track structure by passing trains causing the slow compacting and settling of the ballast and sub-structure. Assuming all variables are held constant, a regular maintenance schedule should bring track geometry back into acceptable limits, but this is generally not the case in real life. In the event that the subgrade cannot support and distribute the pressure caused from the passing train successfully, accelerated track geometry degradation can take place. This accelerated degradation can be further increased when there exists a transition between support strengths which can lead to increased dynamic loading. A case study in sub-structure pressure management has been devised and applied to a high speed rail line. During a recent track renewal operation where track was maintained down to the subgrade, pressure transducers were placed within the sub-grade layer under both the left and right rails, inside and outside of track regions where sub-structure management has been applied. This test segment was monitored over a period of one year with both pressure and track geometry data being recorded at regular intervals. This paper will explore the relationship between sub-structure pressure and local track geometry measurements as it relates to the monitored test segment with a region of known subgrade management transition. Numerous numerical techniques will be applied to understand the change over time of the subgrade pressure distribution capability (measured as pressure beneath the rail) and the degradation of various track geometry channels individually over time. Correlation of the pressure data to track geometry data will also be done using both raw data and data processed using numerical techniques. This will lead to an understanding of how the quality of the track support structure, specifically the track support structure’s ability to distribute pressure, can affect the magnitude and degradation rates of various track geometry channels.

Physical Layer Security Solutions for High Speed Data Networks

2013 ◽  
Vol 712-715 ◽  
pp. 2514-2520
Author(s):  
Zhi Jie Mao ◽  
Jiang Tao Wei ◽  
Hong Wei Li ◽  
Qiong Wu ◽  
Feng Chen Qian
Keyword(s):  
Optical Networks ◽  
High Speed ◽  
Random Sequence ◽  
Random Noise ◽  
Physical Layer ◽  
Data Mapping ◽  
High Data ◽  
Optical Security System ◽  
All Optical ◽  
Noise Function

To improve the confidentiality and availability of the network, it is important to provide multilevel security in the physical layer of optical networks. Based on the orthogonal characterization of OFDM, we introduce a new electronic encryption method for the encryption of the subcarriers symbols after data mapping. Since all-optical networks are emerging as implementations for very high data rate communications, flexible switching and broadband application support, we present a novel all-optical security system technique using random sequence encryption. The noise function was applied via a pseudo-random noise generator seeded with an encryption key. We analyze the performance of both security systems under different application circumstances. Our results confirm the effectiveness of the security technique to make the system less vulnerable to attack.

scholarly journals Analysis of the Time Series Generated by a New High-Dimensional Discrete Chaotic System

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Chuanfu Wang ◽  
Chunlei Fan ◽  
Kai Feng ◽  
Xin Huang ◽  
Qun Ding
Keyword(s):  
Chaotic System ◽  
Chaotic Behavior ◽  
Random Sequence ◽  
High Dimensional ◽  
Suitable Candidate ◽  
Output Sequence ◽  
Short Period ◽  
Large Period ◽  
Low Dimensional ◽  
Sequence Generator

The chaotic behavior of low-dimensional digital chaotic systems is seriously degraded, and the output sequence has a short period. In this study, a digital sequence generator based on a high-dimensional chaotic system is proposed to ensure performance and security. The proposed generator has low resource consumption, and the digital pseudo-random output sequence has a large period. To avoid the nonchaotic state, the multistability in the high-dimensional discrete chaotic system is analyzed. The statistical performance of the output sequence of the proposed digital high-dimensional chaotic system is evaluated, and the results demonstrate that it is a suitable candidate for a long-period pseudo-random sequence generator.

Microfabrication research at the National Submicron Facility

1983 ◽  
Vol 41 ◽  
pp. 86-89
Author(s):  
E.D. Wolf
Keyword(s):  
Integrated Circuits ◽  
Particle Physics ◽  
High Speed ◽  
New Technology ◽  
High Energy ◽  
High Energy Particle ◽  
New Science ◽  
Wide Range ◽  
Intermediate Domain ◽  
Circuit Function

Most microelectronics devices and circuits operate faster, consume less power, execute more functions and cost less per circuit function when the feature-sizes internal to the devices and circuits are made smaller. This is part of the stimulus for the Very High-Speed Integrated Circuits (VHSIC) program. There is also a need for smaller, more sensitive sensors in a wide range of disciplines that includes electrochemistry, neurophysiology and ultra-high pressure solid state research. There is often fundamental new science (and sometimes new technology) to be revealed (and used) when a basic parameter such as size is extended to new dimensions, as is evident at the two extremes of smallness and largeness, high energy particle physics and cosmology, respectively. However, there is also a very important intermediate domain of size that spans from the diameter of a small cluster of atoms up to near one micrometer which may also have just as profound effects on society as “big” physics.

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