Introduction/purpose: The paper presents a numerical simulation of an impact of a 12.7 mm projectile on an armored metal plate with a velocity of 500 m/s at a distance of 900 m. Numerical simulations ...offer the possibility of drastically reducing the time required to obtain results in comparison to the time required for planning, organization and execution of experiments. The numerical simulation is done by variations in the thickness of the armor metal plate, specifically an armor metal plate of a thickness of 10 mm, 17 mm, 18 mm, and 23 mm. The mentioned armored plate thicknesses were chosen based on the results in order to determine the limit thickness of the armored plate for the projectile perforation limit, as well as for complete ballistic protection. Methods: Finite element modeling is used for analyzing stresses and deformations of the armored plates. The mentioned method calculates the impact of the projectile on the obstacle, precisely the collision of the projectile and the armor plate. Results: For the comparative analysis, the parameters used are the values of the stress and the displacement. For each of the above-mentioned thicknesses of the armored metal plate, the values of stress and displacement during projectile impact were determined. The results of this study show how the thickness of the armor plate affects the interaction of the projectile and the armor plate. Conclusion: If the physical and chemical characteristics of the armored plate remain unchanged, as the thickness of the armored plate increases, the possibility of projectile penetration decreases, and vice versa. This research is of essential importance because it analyzes the stresses and deformation of armor plates whose basic role is the protection of personnel and equipment from the projectile impact. In this regard, the thickness of the armored plate for semi-penetration of the projectile is determined.
Abstract
The present RPC Link System has been servicing as one of the
CMS subsystems since installation in 2008. Although the current Link
System has been functioning well for the past 13 years, the ...aging of
its electronic components and lack of radiation hard ASICs could
present problems for future operations. Additionally, the needs to
have a more robust control interface against electromagnetic
interference, to improve the trigger performance with finer time
granularity and to incorporate a higher bandwidth transmission lines
led the idea of upgrading the Link System for the HL-LHC. This
paper reviews the features of the recently developed prototype of
the new Link System.
The CMS experiment has 1054 RPCs in its muon system. Monitoring their currents is the first essential step towards maintaining the stability of the CMS RPC detector performance. The current depends ...on several parameters such as applied voltage, luminosity, environmental conditions, etc. Knowing the influence of these parameters on the RPC current is essential for the correct interpretation of its instabilities as they can be caused either by changes in external conditions or by malfunctioning of the detector in the ideal case. We propose a Machine Learning(ML) based approach to be used for monitoring the CMS RPC currents. The approach is crucial for the development of an automated monitoring system capable of warning for possible hardware problems at a very early stage, which will contribute further to the stable operation of the CMS RPC detector.
CMS RPC activities during LHC LS-2 Shah, M.A.; Sawy, M. El; Tytgat, M. ...
Journal of instrumentation,
10/2020, Letnik:
15, Številka:
10
Journal Article
Recenzirano
Odprti dostop
The second LHC long shutdown period (LS2) is an important opportunity for the CMS Resistive Plate Chambers (RPC) to complete their consolidation and upgrade projects. The consolidation includes ...detector maintenance for gas tightness, HV (high voltage), LV (low voltage) and slow control operation. All services for the RPC Phase-2 upgrade: improved RPC in stations RE3/1 and RE4/1, were anticipated for installation to LS2. This paper summarises the RPC system maintenance and upgrade activities.
During the upcoming High Luminosity phase of the Large Hadron Collider (HL-LHC), the integrated luminosity of the accelerator will increase to 3000 fb\(^{-1}\). The expected experimental conditions ...in that period in terms of background rates, event pileup, and the probable aging of the current detectors present a challenge for all the existing experiments at the LHC, including the Compact Muon Solenoid (CMS) experiment. To ensure a highly performing muon system for this period, several upgrades of the Resistive Plate Chamber (RPC) system of the CMS are currently being implemented. These include the replacement of the readout system for the present system, and the installation of two new RPC stations with improved chamber and front-end electronics designs. The current overall status of this CMS RPC upgrade project is presented.
The expected radiation background in the CMS RPC system has been studied using the MC prediction with the CMS FLUKA simulation of the detector and the cavern. The MC geometry used in the analysis ...describes very accurately the present RPC system but still does not include the complete description of the RPC upgrade region with pseudorapidity \(1.9 < \lvert \eta \rvert < 2.4\). Present results will be updated with the final geometry description, once it is available. The radiation background has been studied in terms of expected particle rates, absorbed dose and fluence. Two High Luminosity LHC (HL-LHC) scenarios have been investigated - after collecting \(3000\) and \(4000\) fb\(^{-1}\). Estimations with safety factor of 3 have been considered, as well.
Response of inoculated foliar fed pea plants ( Pisum sativum L.) to reduced Mo supply Hristozkova, Marieta; Maria GenevaauthorBulgarian Academy of Sciences Department of Mineral Nutrition and Water Relations, Acad. M. Popov Institute of Plant Physiology Acad. G. Bonchev str., block 21 1113 Sofia Bulgaria; Ira StanchevaauthorBulgarian Academy of Sciences Department of Mineral Nutrition and Water Relations, Acad. M. Popov Institute of Plant Physiology Acad. G. Bonchev str., block 21 1113 Sofia Bulgaria ...
2015
Journal Article
Effect of foliar feeding on nitrogen assimilation in alfalfa plants at insufficient molybdenum supply Hristozkova, Marieta; Maria GenevaauthorBulgarian Academy of Sciences Acad. M. Popov, Institute of Plant Physiology Acad. G. Bonchev Street, Building 21 Sofia 1113 Bulgaria; Ira StanchevaauthorBulgarian Academy of Sciences Acad. M. Popov, Institute of Plant Physiology Acad. G. Bonchev Street, Building 21 Sofia 1113 Bulgaria
2015
Journal Article
Impaired wound healing Menke, Nathan B., MD; Ward, Kevin R., MD; Witten, Tarynn M., PhD ...
Clinics in dermatology,
2007, 2007 Jan-Feb, 2007-1-00, 20070101, Letnik:
25, Številka:
1
Journal Article
Recenzirano
Abstract Nonhealing wounds represent a significant cause of morbidity and mortality for a large portion of the population. One of the underlying mechanisms responsible for the failure of chronic ...wounds to heal is an out-of-control inflammatory response that is self-sustaining. Underappreciation of the inherent complexity of the healing wound has led to the failure of monotherapies, with no significant reduction in wound healing times. A model of the inflammatory profile of a nonhealing wound is one in which the equilibrium between synthesis and degradation has been shifted toward degradation. This review summarizes the current information regarding acute wound healing responses as contrasted to the delayed response characteristic of chronic wounds. In addition, some initial complexity theoretical models are proposed to define and explain the underlying pathophysiology.
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