TDOF model for evaluating the global and local impact response of steel-plate composite panels

2021 ◽  
Vol 164 ◽  
pp. 107879
Author(s):  
Lin Wang ◽  
Weiyi Zhao ◽  
Guotao Yang ◽  
Quanquan Guo
Keyword(s):  
Steel Plate ◽  
Impact Response ◽  
Composite Panels ◽  
Local Impact ◽  
Global And Local

scholarly journals PreciPatch: A Dictionary-based Precipitation Downscaling Method

2020 ◽  
Vol 12 (6) ◽  
pp. 1030 ◽  
Author(s):  
Mengchao Xu ◽  
Qian Liu ◽  
Dexuan Sha ◽  
Manzhu Yu ◽  
Daniel Q. Duffy ◽  
...  
Keyword(s):  
Climate Models ◽  
Global Climate ◽  
Super Resolution ◽  
Global Climate Models ◽  
Weather Data ◽  
Downscaling Method ◽  
Spatially Distributed ◽  
Local Impact ◽  
Global And Local ◽  
Precipitation Events

Climate and weather data such as precipitation derived from Global Climate Models (GCMs) and satellite observations are essential for the global and local hydrological assessment. However, most climatic popular precipitation products (with spatial resolutions coarser than 10km) are too coarse for local impact studies and require “downscaling” to obtain higher resolutions. Traditional precipitation downscaling methods such as statistical and dynamic downscaling require an input of additional meteorological variables, and very few are applicable for downscaling hourly precipitation for higher spatial resolution. Based on dynamic dictionary learning, we propose a new downscaling method, PreciPatch, to address this challenge by producing spatially distributed higher resolution precipitation fields with only precipitation input from GCMs at hourly temporal resolution and a large geographical extent. Using aggregated Integrated Multi-satellitE Retrievals for GPM (IMERG) data, an experiment was conducted to evaluate the performance of PreciPatch, in comparison with bicubic interpolation using RainFARM—a stochastic downscaling method, and DeepSD—a Super-Resolution Convolutional Neural Network (SRCNN) based downscaling method. PreciPatch demonstrates better performance than other methods for downscaling short-duration precipitation events (used historical data from 2014 to 2017 as the training set to estimate high-resolution hourly events in 2018).

Overview: Global and Local Impact of Antibiotic Resistance

2016 ◽  
Vol 30 (2) ◽  
pp. 313-322 ◽  
Author(s):  
Richard R. Watkins ◽  
Robert A. Bonomo
Keyword(s):  
Antibiotic Resistance ◽  
Local Impact ◽  
Global And Local

scholarly journals Influence of Different Sites on Impact Response of Steel-Plate Concrete Containment against a Large Commercial Aircraft

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4957
Author(s):  
Xiuyun Zhu ◽  
Jianbo Li ◽  
Gao Lin ◽  
Rong Pan ◽  
Liang Li
Keyword(s):  
Boundary Condition ◽  
Shear Wave Velocity ◽  
Impact Analysis ◽  
Steel Plate ◽  
Impact Response ◽  
Site Conditions ◽  
Commercial Aircraft ◽  
Fixed Boundary ◽  
Damping Effect ◽  
The Impact

This paper aimed at evaluating the influence of different site conditions on the impact response of the structure of nuclear power plants (NPPs) against a large commercial aircraft. The lumped parameter site dynamic model recommended by the code of ASCE 4-98 was used to consider the different homogeneous sites. With respect to the excellent impact resistant performance of steel-plate concrete (SC) structure, the full SC containment is selected as the research object. The impact analysis of the full SC containment against a large commercial aircraft under different site conditions was carried out, based on the force time-history analysis method. The numerical results in terms of the displacement, plastic strain, local concrete damage, and different values of energy were evaluated. The results showed that: (1) For the relatively thin full SC containment, the impact response under the fixed boundary is the largest, while that calculated by other, different sites varies greatly, and there is no consistent rule, the boundary condition which is assumed to be fixed is relatively conservative. (2) For the thicker full SC containment, the displacement response decreased with the increasing of the site shear wave velocity, which is the smallest when the fixed boundary is considered. When the shear wave velocity of the site is large enough, its boundary condition which is assumed to be the fixed constraint is reasonable. (3) For the relatively thin full SC containment, the site damping effect has a significant effect on the structural impact response. Nevertheless, the impact response of the thicker containment is slightly influenced by the site damping effect. (4) For the impact analysis of the structures of NPPs against a large commercial aircraft, it is suggested that both the specific site condition and fixed boundary should be considered.

The EU and Human Rights as Institutional Facts in the Finnish Political Discourse on Family Reunification

2019 ◽  
Vol 16 (2) ◽  
pp. 317-328
Author(s):  
Linda Hyökki
Keyword(s):  
Human Rights ◽  
Social Ontology ◽  
Family Reunification ◽  
Institutional Facts ◽  
Political Response ◽  
The Social ◽  
Local Impact ◽  
Global And Local ◽  
Violent Conflicts ◽  
The Eu

This article analyses the Finnish political response to the refugee influx connected with the Syrian war and violent conflicts in its neighbouring states. In July 2016, a law amendment on the Finnish Aliens Act about a secured income prerequisite for family reunification applications came into force. Using argumentation schemes as outlined by Fairclough & Fairclough (2012), this article analyses the discursive framing of the law amendment in Parliament. The paper benefits from the social ontology of John Searle (1995; 2010) and utilises his concept of institutional facts. The analysis shows that, as normative sources for action, the institutional context of the EU, as well as the Human Rights, possess different degrees of deontic modality which in turn shapes the representation of social reality in the context of the refugee crisis and its global and local impact.

Study of Far-Field Pyroshock Responses of Composite Panels

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
R. Velmurugan ◽  
E. Mohamed Najeeb
Keyword(s):  
Steel Plate ◽  
Time History ◽  
Composite Panel ◽  
Chamber Pressure ◽  
Far Field ◽  
Composite Panels ◽  
Test Panel ◽  
Element Analysis ◽  
Acceleration Time ◽  
Acceleration Time Histories

The experimental and numerical studies on far-field pyroshock responses of composite panels are presented in this paper. The purpose of this study is to find out the region of composite panel where the pyroshock response is high and thereby the panel can be used as a testing bed to examine tiny elements such as electronic parts used in spacecraft. Experiments based on bi-plate technology are conducted on different combination of e-glass/epoxy composite panel parameters. The structural responses are analyzed using panel parameters as well as shock response spectrums (SRSs) computed from the acceleration-time histories. The experiments are carried out for a low range of chamber pressure with projectiles of varying length to get the far-field response of the test panel. The accelerations of the panel at selected locations are measured by the PCB Piezotronics (Depew, NY) accelerometers and National Instruments-Data Acquisition (NI-DAQ) system (National Instruments, Austin, TX) with labview software. Finite element analysis (FEA) for the pyroshock environment is done using abaqus/Explicit software. Due to the symmetry of the structure as well as the loading, only quarter portion of the panel is analyzed. From the results, it is found that acceleration increases as thickness of composite test panel increases (about 20–70%) for all the combinations of projectile length and chamber pressure at all the points considered on the laminate. Transfer of acceleration from steel plate onto composite panel through physical connections is predominant (about 90–95% of total transfer) than that through air media between the steel plate and the composite panel. Velocity with lower momentum induces lower frequency modes to be dominant whereas velocity with higher momentum induces higher frequency modes. Normally higher accelerations (about 40–90%) are experienced at the center location than any other locations under consideration. The SRSs are obtained both from FEA and experiments. The experimental study shows good agreement with the FEA results both in acceleration time history as well as in SRS.

scholarly journals LCLS – Large Laser Infrastructure Development and Local Implications

2014 ◽  
Vol 60 (2) ◽  
pp. 187-192 ◽  
Author(s):  
Ryszard S. Romaniuk
Keyword(s):  
Microwave Cavity ◽  
Light Sources ◽  
Infrastructure Development ◽  
Fifth Generation ◽  
User Facility ◽  
Linac Coherent Light Source ◽  
Local Impact ◽  
Development State ◽  
Global And Local ◽  
Design Construction

Abstract The most powerful now in the world, American Xray laser LCLS (Linac Coherent Light Source), has been working as a research and user facility since 2009. It is further developed to LCLS II machine at the Stanford National Accelerator Laboratory SLAC in Menlo Park CA. In a certain sense, LCLS II is a response to the EXFEL machine and a logical extension of LCLS. All these machines are light sources of the fifth generation. EXFEL is expected to open user facility in 2016, at a cost of over 1 mld Euro. LCLS II, which design started in 2010, will be operational in 2017. The lasers LCLS, LCLS II and EXFEL use SASE and SEED methods to generate light and are powered by electron linacs, LCLS by a warm one, and EXFEL by a cold one. The linacs have energies approaching 20 GeV, and are around 2 - 3 km in length. EXFEL linac uses SRF TESLA microwave cavity technology at 1,3GHz. A prototype of EXFEL was FLASH laser. SLAC Laboratory uses effectively over 50 years experience in research, building and exploitation of linear electron accelerators. In 2009, a part of the largest 3 km SLAC linac was used to build the LCLS machine. For the LCLS II machine a new infrastructure is build for two new laser beams and a number of experimental stations. A number of experts and young researchers from Poland participate in the design, construction and research of the biggest world linear and elliptical accelerators and FEL lasers like LCLS (Stanford), EXFEL (DESY) and CEBAF (JLab), and a few more. The paper concentrates on the development state-of-the-art of large laser infrastructure and its global and local impact, in the competitive world of R&D. LCLS infrastructure implications in Poland are considered.

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