Impulsive Response of Rectangular Metal Sandwich Plate with a Graded Foam Core

2018 ◽  
Vol 10 (06) ◽  
pp. 1850064 ◽  
Author(s):  
Chunping Xiang ◽  
Qinghua Qin ◽  
Fangfang Wang ◽  
Xuehui Yu ◽  
Mingshi Wang ◽  
...  
Keyword(s):  
Analytical Study ◽  
Sandwich Plate ◽  
Yield Criterion ◽  
Blast Resistance ◽  
Impulsive Loading ◽  
Compressive Properties ◽  
Impulsive Response ◽  
Rectangular Sandwich Plate ◽  
Negative Gradient ◽  
Insight Into

An analytical study considering inhomogeneous core compression is conducted to investigate the impulsive response of fully clamped rectangular metal sandwich plate with a graded foam (GF) core. The dynamic compressive properties of GF under impulsive loading are theoretically modeled antecedently. The approximate analytical predictions are achieved for the impulsive response of rectangular sandwich plate with a linear strength distributed GF core along the thickness by using the relevant loci of a new yield criterion. The analytical predictions agree well with the finite element (FE) results and indicate that the sandwich plates with negative gradient design outperform their uniform counterparts in impulsive resistance. The present study provides an insight into understanding the blast resistance of the sandwich structures with inhomogeneous cores.

scholarly journals An Analytical study of Bediuzzaman Said Nursi’s Intellectual Development and Composition of Risale-i Nur (a Thematic Qur’ānic Exegesis)

2020 ◽  
Vol 10 (2) ◽  
Author(s):  
Dr. Shumaila Majeed
Keyword(s):  
Intellectual Development ◽  
Analytical Study ◽  
Muslim Community ◽  
The Third ◽  
Life Education ◽  
Representative Work ◽  
Qur'anic Exegesis ◽  
Islamic Belief ◽  
Distinguishing Features ◽  
Insight Into

The current study analyses Bediuzzaman Said Nursi’s life and contributions. It presents a short description of his early life, education and dissatisfaction with the then prevailing education systems. This is followed by an analysis of his intellectual development due to rapidly changing circumstances. The paper also presents an insight into Nursi’s representative work ‘Risale-i Nur’ through an analysis of its structure and methodology. This is significant because his intellectual development, due to changes in his circumstances, played an instrumental role in determining the style, method and objectives of Risale. Hence, the study of his intellectual development is imperative to understand the objectives of Risale. The findings of the paper revealed that Nursi’s approach to reform the Muslim society was not stagnant. In the ‘Old Said’ phase, he attempted to neutralize the decline in Muslim community through sociopolitical reforms. The ‘New Said’ phase was marked by his efforts to strengthen belief, encounter anti-religious ideologies and detachment from politics. In the ‘Third Said’ phase, he again took interest in sociopolitical matters but it was limited to the theoretical realm with no practical involvement. The study also found that the structure of Risale, its treatment of subjects and its methodology are its distinguishing features. It consists of the elements well-suited to the needs of the time to save Islamic belief against the onslaught of atheistic ideologies. The current research was conducted using the qualitative approach. It is beneficial for academia in understanding the intellectual development of this great 20th century Turkish Muslim scholar.

Calculation for Elastic Global Buckling of Sandwich Plates with Ribs

2012 ◽  
Vol 188 ◽  
pp. 25-30 ◽  
Author(s):  
Qi Chao Xue ◽  
Guang Ping Zou ◽  
Ye Wu ◽  
Hai Lin Xiong ◽  
Meng Chai
Keyword(s):  
Energy Method ◽  
Sandwich Plate ◽  
Plate Theory ◽  
Sandwich Plates ◽  
Buckling Stress ◽  
Global Buckling ◽  
Simple Support ◽  
Rectangular Sandwich Plate ◽  
Two Sides ◽  
Rectangular Sandwich Plates

Based on Reissner’s sandwich plate theory, the critical globlal buckling equation of sandwich plate with ribs is deduced by energy method under simple support boundary conditions. And the critical buckling solution is obtained and discussed here. Afterwards a rectangular sandwich plate with steel faceplate and polyurthane core is taken as an example. The influence on critical global buckling stress with different inertia moments in rectangular sandwich plates are discussed. simularly the effect of the lengh ratio of two sides and the thickness of rectangular sandwich plate are also studied.

Evaluation of Polymers as Lubricants in the Extrusion of Aluminum

1982 ◽  
Vol 104 (4) ◽  
pp. 552-557 ◽  
Author(s):  
S. Suresh ◽  
S. Bahadur
Keyword(s):  
Yield Criterion ◽  
Film Formation ◽  
Normal Pressure ◽  
Velocity Fields ◽  
Powder Particle Size ◽  
Extrusion Force ◽  
Polymer Powder ◽  
Von Mises ◽  
Insight Into

The lubricating behavior of polytetrafluoroethylene, polyvinyl chloride, polychlorotrifluoroethylene, low density polyethylene, and high density polyethylene powders in the extrusion of 1100-0 aluminum has been investigated in terms of the extrusion force requirement and the quality of extrudate surface finish. Extrusion experiments which provided a measure of the extrusion force and friction force with varying ram travel were performed under both ambient and high temperature conditions. From these data the variation of coefficient of friction with ram travel and normal pressure has been calculated using the analysis based on von Mises’ yield criterion and spherical velocity fields. The effect of polymer powder particle size on the extrusion force was investigated. The extrudate surfaces were examined by scanning electron miscroscopy in order to study the film formation capability of polymers and to get an insight into the mechanism of polymer lubrication.

scholarly journals Neurons with dendrites can perform linearly separable computations with low resolution synaptic weights

F1000Research ◽  
2021 ◽  
Vol 9 ◽  
pp. 1174
Author(s):  
Romain D. Cazé ◽  
Marcel Stimberg
Keyword(s):  
Analytical Study ◽  
Neuron Model ◽  
Single Layer ◽  
Neural Computation ◽  
Low Resolution ◽  
Strong Constraint ◽  
Non Linear ◽  
Limited Precision ◽  
Insight Into

In theory, neurons modelled as single layer perceptrons can implement all linearly separable computations. In practice, however, these computations may require arbitrarily precise synaptic weights. This is a strong constraint since both biological neurons and their artificial counterparts have to cope with limited precision. Here, we explore how non-linear processing in dendrites helps overcome this constraint. We start by finding a class of computations which requires increasing precision with the number of inputs in a perceptron and show that it can be implemented without this constraint in a neuron with sub-linear dendritic subunits. Then, we complement this analytical study by a simulation of a biophysical neuron model with two passive dendrites and a soma, and show that it can implement this computation. This work demonstrates a new role of dendrites in neural computation: by distributing the computation across independent subunits, the same computation can be performed more efficiently with less precise tuning of the synaptic weights. This work not only offers new insight into the importance of dendrites for biological neurons, but also paves the way for new, more efficient architectures of artificial neuromorphic chips.

scholarly journals Bayogenin 3-O-Cellobioside is a novel non-cultivar specific anti-blast metabolite produced in rice in response to Pyricularia oryzae infection

2019 ◽  
Author(s):  
Justice Norvienyeku ◽  
Lili Lin ◽  
Abdul Waheed ◽  
Xiaomin Chen ◽  
Jiandong Bao ◽  
...  
Keyword(s):  
Control Strategy ◽  
Host Resistance ◽  
Blast Resistance ◽  
Differential Resistance ◽  
Host Immunity ◽  
Cereal Crops ◽  
Rice Cultivars ◽  
First Time ◽  
Insight Into

AbstractRice cultivars from japonica and indica lineage possess differential resistance against blast fungus on an account genetic divergence. Whether different rice cultivars also show distinct metabolomic changes in response to P. oryzae, and their role in host resistance, are poorly understood. Here, we examine the responses of six different rice cultivars from japonica and indica lineage challenged with P. oryzae. Both susceptible and resistant rice cultivars expressed several metabolites exclusively during P. oryzae infection, including the saponin Bayogenin 3-O-cellobioside. Bayogenin 3-O-cellobioside level in infected rice directly correlated with their resistant attributes. These findings reveal, for the first time to our knowledge that besides oat, other grass plants including rice produces protective saponins. Our study provides insight into the role of pathogen-mediated metabolomics-reprogramming in host immunity. The correlation between Bayogenin 3-O-Cellobioside levels and blast resistance suggests that engineering saponin expression in cereal crops represents an attractive and sustainable disease control strategy.

scholarly journals Terrorism and Contemporary Religious Cults: Jim Jones, Shoko Asahara and Abu Bakr Al-Baghdadi

2020 ◽  
Vol 14 (1) ◽  
pp. 32
Author(s):  
Tareq S. Albhlal
Keyword(s):  
Local Government ◽  
Analytical Study ◽  
Real Life ◽  
Government Agencies ◽  
Efficient Operation ◽  
World Today ◽  
The World ◽  
Service Sectors ◽  
Insight Into

The present study breaks new ground in the field of radical cults as it provides a contemporary insight into three cult leaders; Jim Jones, Shoko Asahara and Abu Bakr Al-Baghdadi. This comparative analytical study will assist national and local government agencies with the identifying the relations between those leaders and their conclusions of terrorism, which in turn, had led to the mass death of cult adherents. Terrorism is a major, and growing, concern in the world today as it relates to security, safety, and the efficient operation of the most important service sectors in any state. The personalities of Jones, Asahara and Al-Baghdadi have made of them sect leaders from three very different religions: Christianity, Buddhism and Islam. Therefore, religion is not the source of radicalism/mass death as the similarities and commonalities exist among those three different groups. Eminently, this study has emphasized on the answers analytically to the research query through academic process supported by refereed articles and real-life occurrences.

Blast Behavior of Columns Built with High-Strength Concrete and Grade 690 MPa High-Strength Reinforcement

2020 ◽  
Author(s):  
Amer Hammoud ◽  
Junbo Yan ◽  
Yang Li ◽  
Hassan Aoude
Keyword(s):  
High Strength Concrete ◽  
Analytical Study ◽  
Blast Resistance ◽  
Concrete Strength ◽  
High Strength ◽  
Strength Concrete ◽  
Steel Ratio ◽  
Blast Response ◽  
Sdof Analysis ◽  
Blast Performance

As part of this study a series of columns built with high-strength concrete (HSC) and Grade 690 MPa high-strength reinforcement are tested under blast loads using a shock-tube. The performance of the columns is compared to a set of columns specimens built with Grade 400 MPa reinforcement. In addition to the effects of concrete and steel type, the effects of longitudinal steel ratio and seismic detailing are also investigated. The results show that concrete strength has limited effects on blast behavior. Conversely, use of high-strength bars significantly enhances column blast performance by reducing displacements and increasing blast resistance, with an ability to reduce reinforcement. The results further demonstrate that increasing the longitudinal steel ratio and seismic detailing improve the blast behavior of columns built with conventional and high-strength bars. As part of the analytical study the blast response of the columns is predicted using SDOF analysis and finite element modelling.

scholarly journals MHD mode conversion in a stratified atmosphere

2007 ◽  
Vol 3 (S247) ◽  
pp. 296-302 ◽  
Author(s):  
A. M. Dee McDougall ◽  
Alan W. Hood
Keyword(s):  
Analytical Study ◽  
Mode Conversion ◽  
One Dimensional ◽  
Complex Process ◽  
Steep Temperature Gradient ◽  
Isothermal Case ◽  
Set Up ◽  
Insight Into ◽  
Upper Boundary ◽  
Good Agreement

AbstractMode conversion in the region where the sound and Alfvén speeds are equal is a complex process, which has been studied both analytically and numerically, and has been seen in observations. In order to further the understanding of this process we set up a simple, one-dimensional model, and examine wave propagation through this system using a combination of analytical and numerical techniques. Simulations are carried out in a gravitationally stratified atmosphere with a uniform, vertical magnetic field for both isothermal and non-isothermal cases. For the non-isothermal case a temperature profile is chosen to mimic the steep temperature gradient encountered at the transition region. In all simulations, a slow wave is driven on the upper boundary, thus propagating down from low-β to high-β plasma across the mode-conversion region. In addition, a detailed analytical study is carried out where we predict the amplitude and phase of the transmitted and converted components of the incident wave as it passes through the mode-conversion region. A comparison of these analytical predictions with the numerical results shows good agreement, giving us confidence in both techniques. This knowledge may be used to help determine wave types observed and give insight into which modes may be involved in coronal heating.

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