Analysis of damage probability of antiaircraft gun based on future airspace window

The launch of the medium resolution Synthetic Aperture Radar (SAR) Sentinel-1 constellation in 2014 has allowed public and private organizations to introduce SAR interferometry (InSAR) products as a valuable option in their monitoring systems. The massive stacks of displacement data resulting from the processing of large C-B and radar images can be used to highlight temporal and spatial deformation anomalies, and their detailed analysis and postprocessing to generate operative products for final users. In this work, the wide-area mapping capability of Sentinel-1 was used in synergy with the COSMO-SkyMed high resolution SAR data to characterize ground subsidence affecting the urban fabric of the city of Pistoia (Tuscany Region, central Italy). Line of sight velocities were decomposed on vertical and E–W components, observing slight horizontal movements towards the center of the subsidence area. Vertical displacements and damage field surveys allowed for the calculation of the probability of damage depending on the displacement velocity by means of fragility curves. Finally, these data were translated to damage probability and potential loss maps. These products are useful for urban planning and geohazard management, focusing on the identification of the most hazardous areas on which to concentrate efforts and resources.

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Experiment and numerical modeling of asymmetrically initiated hexagonal prism warhead

Advances in Mechanical Engineering ◽

10.1177/1687814016687966 ◽

2017 ◽

Vol 9 (1) ◽

pp. 168781401668796 ◽

Cited By ~ 1

Author(s):

Yuan Li ◽

Yuquan Wen

Keyword(s):

Numerical Modeling ◽

The Other ◽

Energy Utilization ◽

Hexagonal Prism ◽

Cylindrical Structure ◽

Damage Probability ◽

Other Hand ◽

Density Enhancement ◽

Fragment Distribution ◽

Velocity Enhancement

Traditional fragmentation warheads are usually initiated on the axis, producing a uniform fragment distribution around the warhead, but only little portion of them can be imposed on the targets. The aimable warhead, on the other hand, using the off-axis initiations or the structure deforming, can improve the warhead energy utilization highly. Seeking methods to both enhance the fragment velocity and density has significant value for improving the target damage probability. In this article, a warhead shaped as hexagonal prism was studied using arena experiment and numerical modeling and compared with the traditional cylindrical structure. The fragment velocities and target hit patterns of the two types of warheads under axial initiation and asymmetrical initiation are obtained. It is revealed that for the hexagonal prism warhead, the asymmetrical initiation can enhance the fragment velocities by 27.71% and enhance fragment density by 34.09% compared to the axial initiation. The fragment velocity enhancement is close to that of the cylindrical warhead, but the fragment density enhancement is far above the cylindrical warhead. This indicates that the asymmetrically initiated hexagonal prism warhead is a very effective aimable warhead.

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Efficiency Measurement of Maintenance Costs on Customer Service Process PT Indonesia Comnets Plus West Java

TRIKONOMIKA ◽

10.23969/trikonomika.v14i2.411 ◽

2015 ◽

Vol 14 (2) ◽

pp. 138

Author(s):

Ika Rizky Setyaningrum ◽

Palti Marulitua Sitorus

Keyword(s):

Information Technology ◽

Customer Service ◽

Preventive Maintenance ◽

Cost Optimization ◽

Optimization Analysis ◽

West Java ◽

Maintenance Costs ◽

Analysis Techniques ◽

Damage Probability ◽

Optimal Period

Information technology is growing rapidly. The problems arising in the conjunction magnitude of information technology devices are how to manage, maintain, and calculate the amount of required investments. The purposes of this study are to measurepreventive and corrective cost optimization maintenance which determines the most optimal performance for alternative maintenance activity. The case studies in this research is PT Indonesia Comnets Plus (ICON +) West Java focusing on how the process of customer service telecommunication maintenance. Analysis techniques used are descriptive and optimization analysis. The level of corrective maintenance costs are known through services damage probability, average cost of service damage in the period of 2011-2014, and corrective cost analysis formula. To determine the level of preventive maintenance costs, it requires the calculation of damage probability screened estimated monthly service and then calculating the total cost of preventive maintenance. The analysis requires amount of damage and cost of protecting canceling services. The result, general implementation of maintenance services has been running well, but not optimal. Period of preventive maintenance services can be optimized with an average of 12-month treatment.

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Experimental Investigation on Laser Pretreatment of Optical Films

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.189-193.3713 ◽

2011 ◽

Vol 189-193 ◽

pp. 3713-3716

Author(s):

Zhi Lin Xia

Keyword(s):

Experimental Investigation ◽

Energy Density ◽

Pulse Width ◽

Incidence Angle ◽

Damage Threshold ◽

Negative Influence ◽

Damage Probability ◽

Optical Films ◽

Laser Induced Damage ◽

K9 Glass

Optical films have been prepared on K9 glass by electronic beam evaporation. Parameters of S-polarized Nd: YAG laser used for pretreatment and damage tests are: wavelength is 355nm, pulse width is 8ns, and incidence angle is 33.75 degree. The results reflect that: the influence of laser pretreatment on laser induced damage threshold of films is uncertain. Laser pretreatment not always improve the laser induced damage threshold of films, and sometimes it will cause negative influence. As for damage probability, for a certain testing energy density, there is an energy density scope, pretreatment pulse with energy density in which can reduce the laser induced damage probability of films. The energy density of laser pretreatment pulse should be selected according to the serving conditions of films.

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Effect of subsurface impurities of fused silica on laser induced damage probability

Infrared and Laser Engineering ◽

10.3788/irla201746.0406002 ◽

2017 ◽

Vol 46 (4) ◽

pp. 406002

Author(s):

高翔 Gao Xiang ◽

邱荣 Qiu Rong ◽

周国瑞 Zhou Guorui ◽

姚科 Yao Ke ◽

蒋勇 Jiang Yong ◽

...

Keyword(s):

Fused Silica ◽

Damage Probability ◽

Laser Induced Damage

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Analysis of component damage probability of a small engine based on penetration experiments and M & S

Journal of Mechanical Science and Technology ◽

10.1007/s12206-020-0125-4 ◽

2020 ◽

Vol 34 (2) ◽

pp. 765-775 ◽

Cited By ~ 2

Author(s):

Hyung Chul Kim ◽

Kang Park ◽

Myung Hoon Nam ◽

Woo Sung Park

Keyword(s):

Damage Probability

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Regional seismic risk in British Columbia — classification of buildings and development of damage probability functions

Canadian Journal of Civil Engineering ◽

10.1139/l04-099 ◽

2005 ◽

Vol 32 (2) ◽

pp. 372-387 ◽

Cited By ~ 44

Author(s):

Carlos E Ventura ◽

W.D Liam Finn ◽

Tuna Onur ◽

Ardel Blanquera ◽

Mahmoud Rezai

Keyword(s):

British Columbia ◽

Probability Distribution ◽

Classification System ◽

Seismic Risk ◽

Distribution Functions ◽

Intensity Level ◽

Ground Shaking ◽

Damage Level ◽

Damage Probability ◽

Damage Probability Matrix

Regional seismic risk estimations are needed in southwestern British Columbia, since it is one of the most seismically active and highly populated regions in Canada. Regional estimations typically involve a large number of buildings, which makes it necessary to establish a building classification system, where the average response to earthquake shaking is assumed to be similar within each building class. In this study, buildings in British Columbia were divided into 31 classes based on their material, lateral load bearing system, height, use, and age. A damage probability matrix (DPM) was then developed for each building class which describes the probability of being in a certain damage level (i.e., light, moderate, heavy, etc.) given the ground shaking intensity. Next, a probability distribution function was fit to the discrete probability values at each intensity level. The products of this study, the building classification system, the DPMs, and the probability distribution functions will allow regional damage and loss estimations in the area.Key words: seismic risk, vulnerability, building classification, structural system, building response, damage, probability.

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