Timber bodies strength of materials: Fundamental principles, test specimens proposal

2021 ◽  
Author(s):  
Miguel A. Tortoriello ◽  
Luis J. Lima ◽  
Ana C. Cobas ◽  
Renso A. Cichero
Keyword(s):  
Mathematical Models ◽  
Soil Mechanics ◽  
Economic Cost ◽  
Practical Application ◽  
Strength Of Materials ◽  
Specific Strength ◽  
Road Map ◽  
Theoretical Support ◽  
Basic Test ◽  
Structural Code

<p>To reduce the economic cost of a Timber Structure, the first condition is to have a “rational” Structural Code, that is, a Code supported by research and a specific theory. To establish a rational Structural Timber Code, a specific theoretical support is needed. The objective of this paper is to cooperate in the construction of this theoretical support. To design timber structures, it is necessary to have mathematical models able to reproduce the resistance of timber bodies under different solicitations. In this paper, a “road map” to arrive to a specific Strength of Materials of Timber Bodies is proposed. This theory will be the tool needed to develop the mathematical models whose quantification will be obtained by testing “basic test specimens” obtained from timber of any particular timber building (like in concrete or soil mechanics). Finally, a “basic test specimen” for practical application of the theory is proposed. In this case, the experimental support is referred to “willow” wood.</p>

scholarly journals Application of quasiconformal mapping methods to the investigation of the explosive processes impact on the environment

2019 ◽  
pp. 17-18
Author(s):  
Kateryna Mykolaiivna Malash ◽  
Andrii Yaroslavovych Bomba
Keyword(s):  
Numerical Methods ◽  
Mathematical Models ◽  
Quasiconformal Mapping ◽  
Quasiconformal Mappings ◽  
Practical Application

The mathematical models used to study explosive processes are given. A class of problems investigating the influence of explosive processes on the environment by the quasiconformal mappings numerical methods are outlined and their practical application are described

Current and future potential of alternative techniques

1998 ◽  
Vol 22 ◽  
pp. 161-171
Author(s):  
D. I. Givens ◽  
M. Gill
Keyword(s):  
Mathematical Models ◽  
Volatile Fatty Acids ◽  
Physical Structure ◽  
Practical Application ◽  
In Vitro Techniques ◽  
Predicting Factors ◽  
In Vitro Systems ◽  
Future Potential ◽  
Alternative Techniques

AbstractRuminant animal production faces numerous challenges and it seems that both economic and biological benefits will be derived from moving food characterization from simple energy and protein-based approaches to those which assess nutrient supply in some detail. In vitro systems will need to reflect this change and this paper considers in particular, the need for estimations of rumen volatile fatty acids and microbial protein supplies. Emphasis is placed on the possibility that in vitro techniques can be used to provide biochemical data which can themselves be used in mathematical models of wider processes. This paper also examines the need for in vitro techniques to reflect the microbial!animal response to the physical structure of foods and also the requirement for in vitro approaches which ask why a food has a certain value rather than simply what the value is. In vitro techniques also have a substantial role outside the digestive tract in predicting factors such as voluntary food intake and some aspects of tissue metabolism and some of these aspects are considered. Tor practical application in vitro techniques will need to provide value for money and be compatible as parameters in mathematical models to have an impact at farm level. In this regard physical in vitro techniques such as NIRS seem to have enormous potential.

scholarly journals Socionic models of a person and their application in aviation

2020 ◽  
Vol 41 (45) ◽  
pp. 129-144
Author(s):  
Olga V. ARINICHEVA ◽  
◽  
Natalia A. LEBEDEVA ◽  
Aleksei V. MALISHEVSKII ◽  
◽  
...  
Keyword(s):  
Mathematical Models ◽  
Set Theory ◽  
Fuzzy Set ◽  
Fuzzy Set Theory ◽  
Air Traffic ◽  
Practical Application ◽  
Air Traffic Controllers ◽  
Aircraft Pilots

The article contains mathematical models of a person’s socionics characteristics based on fuzzy set theory. The practical application of the proposed models is focused on assessing professional aptitude of operators who have to process massive flows of information at a forced pace (for example, aircraft pilots or air traffic controllers).

scholarly journals Predictive model of development of atopic dermatitis in children

2016 ◽  
Vol 13 (2) ◽  
pp. 27-31
Author(s):  
S V Levashcva ◽  
E I Etkina ◽  
A A Fazylova ◽  
G D Sakaeva ◽  
L I Babenkova ◽  
...  
Keyword(s):  
Atopic Dermatitis ◽  
Logistic Regression ◽  
High Risk ◽  
Mathematical Models ◽  
Statistical Significance ◽  
Regression Method ◽  
Practical Application ◽  
Logistic Regression Method ◽  
Monitoring Group ◽  
Logistic Regression Equation

Background. To identify the set of possible predictors of atopic dermatitis forming in children. Methods. There were 440 children aged from 0 to 18 years old (315 patients with atopic dermatitis, 125 - children of the monitoring group) under investigation. Mathematical models used logistic regression method were developed. Results. On the basis of the obtained data the logistic regression equation was selected, including 16 predictors, statistical significance of which was within 5% of the Wald statistics. Conclusion. Practical application of the devised formula will help to identify children with high risk to develop atopic dermatitis.

scholarly journals Optimization of Precontrol Methods and Analysis of a Dynamic Model for Brucellosis: Model Development and Validation (Preprint)

2020 ◽  
Author(s):  
Yihao Huang ◽  
Mingtao Li
Keyword(s):  
Infectious Diseases ◽  
Mathematical Models ◽  
Rapid Development ◽  
Transmission Model ◽  
Dynamic Threshold ◽  
Key Populations ◽  
Human Beings ◽  
Chinese People ◽  
Theoretical Support ◽  
Number Of Patients

BACKGROUND Brucella is a gram-negative, nonmotile bacterium without a capsule. The infection scope of Brucella is wide. The major source of infection is mammals such as cattle, sheep, goats, pigs, and dogs. Currently, human beings do not transmit Brucella to each other. When humans eat Brucella-contaminated food or contact animals or animal secretions and excretions infected with Brucella, they may develop brucellosis. Although brucellosis does not originate in humans, its diagnosis and cure are very difficult; thus, it has a huge impact on humans. Even with the rapid development of medical science, brucellosis is still a major problem for Chinese people. Currently, the number of patients with brucellosis in China is 100,000 per year. In addition, due to the ongoing improvement in the living standards of Chinese people, the demand for meat products has gradually increased, and increased meat transactions have greatly promoted the spread of brucellosis. Therefore, many researchers are concerned with investigating the transmission of Brucella as well as the diagnosis and treatment of brucellosis. Mathematical models have become an important tool for the study of infectious diseases. Mathematical models can reflect the spread of infectious diseases and be used to study the effect of different inhibition methods on infectious diseases. The effect of control measures to obtain effective suppression can provide theoretical support for the suppression of infectious diseases. Therefore, it is the objective of this study to build a suitable mathematical model for brucellosis infection. OBJECTIVE We aimed to study the optimized precontrol methods of brucellosis using a dynamic threshold–based microcomputer model and to provide critical theoretical support for the prevention and control of brucellosis. METHODS By studying the transmission characteristics of Brucella and building a Brucella transmission model, the precontrol methods were designed and presented to the key populations (Brucella-susceptible populations). We investigated the utilization of protective tools by the key populations before and after precontrol methods. RESULTS An improvement in the amount of glove-wearing was evident and significant (<i>P</i>&lt;.001), increasing from 51.01% before the precontrol methods to 66.22% after the precontrol methods, an increase of 15.21%. However, the amount of hat-wearing did not improve significantly (<i>P</i>=.95). Hat-wearing among the key populations increased from 57.3% before the precontrol methods to 58.6% after the precontrol methods, an increase of 1.3%. CONCLUSIONS By demonstrating the optimized precontrol methods for a brucellosis model built on a dynamic threshold–based microcomputer model, this study provides theoretical support for the suppression of Brucella and the improved usage of protective measures by key populations.

Research on Start-up Time of the Supply Chain Emergency Plan Based on Online Method

2012 ◽  
Vol 174-177 ◽  
pp. 2749-2753
Author(s):  
Qian Wu ◽  
Li Hua Wang ◽  
Wenguang Chang ◽  
Lu Yan Li
Keyword(s):  
Supply Chain ◽  
Mathematical Models ◽  
Competitive Ratio ◽  
Research Result ◽  
Coordination Mechanism ◽  
Practical Application ◽  
Emergency Plan ◽  
Optimal Response ◽  
Start Up

This paper researches the optimal start-up time of emergency plan adopting online method. In view of this problem, it establishes respectively mathematical models of the single enterprise and the simple supply chain enterprises. And then competitive ratio is introduced to illustrate the effectiveness of start-up strategies. When the whole supply chain enterprises are considered as the research objective, the time asynchronous phenomena when launching the preplan appear between the single enterprise and the whole supply chain. Aimed at this phenomenon, it puts forward coordination mechanism, realizes the optimal response of the whole supply chain for emergencies, and controls the loss emergencies causes to the minimum. The research result has theoretical guidance and practical application value.

scholarly journals The design of a volleyball training drill: definition of parameters and assessment of drills’ contents

2021 ◽  
Vol 43 ◽  
Author(s):  
Thiago Machado ◽  
Wellington Rangel ◽  
Leonardo Lamas
Keyword(s):  
Complete Agreement ◽  
Test Results ◽  
Practical Application ◽  
Graph Topology ◽  
Kappa Test ◽  
Theoretical Support ◽  
Definition Of

ABSTRACT The aim of this work was to define a model of volleyball drills’ structure. A set of parameters has been designed and tested for: i) pertinence and accuracy; ii) criteria reliability; iii) practical application. Expert judges evaluated model’s pertinence, accuracy and criteria reliability. A sample of 50 drills was assessed for drills’ analysis. The model demonstrated pertinence and accuracy, with complete agreement among experts. Criteria were reliable (Kappa test results > 0.8). Analysis indicated significant differences in the frequency of model’s parameters (graph topology), for instance among attributes (basic complex - 30%) with manifold drills (46,7%) in the technical domain (100%). The model contributes with theoretical support for a coach’s key task of designing practice contents.

scholarly journals The internal structure of the ways of performing learning actions and the stages of students’ personal agency development

2021 ◽  
Vol 10 (4) ◽  
pp. 284-294
Author(s):  
Alexander V. Kaptsov ◽  
◽  
Igor B. Akimov ◽  
Ekaterina V. Nekrasova ◽  
◽  
...  
Keyword(s):  
University Students ◽  
Mathematical Models ◽  
Internal Structure ◽  
Learning Activities ◽  
Full Time ◽  
Personal Agency ◽  
Practical Application ◽  
Topical Problem ◽  
Development Stages ◽  
Second Year

The topical problem of pedagogical psychology is to identify the conditions and factors of students’ personal agency development. One of the ways to solve the problem is to build adequate mathematical models. The purpose of the study is to justify the use of multimediator analysis in modelling a fractal psychological and pedagogical system so as to describe the ways and stages of students’ agency development in the course of the study. It is hypothesized that ways of performing learning actions are considered as elements of the stages of learners’ personal agency formation. And in this function they play a twofold role: they act both as predictors of the agency development stages and mediators that determine the interconnection between the ways and stages of the personal agency development. The test of the multimediator analysis was carried out in three groups of 2nd–4th-year university students, studying full-time (57 people; average age 20.6 years, Sd = 2.4 years; all females) and two groups of second-year students of college (40 people, 39 of them are boys, aged 17.5, Sd = 0.71). The practical application of the research results makes it possible to identify both the internal structure of the ways of performing learning activities and the stages of students’ personal agency development. The prospects of using multimediator analysis with the help of modern statistical packages are shown.

scholarly journals Transport delay assessment at signalized intersections feeding focal points

2021 ◽  
Vol 341 ◽  
pp. 00003
Author(s):  
Anton Zedgenizov ◽  
Aleksandr Solodkiy ◽  
Ivan Silinsky
Keyword(s):  
Mathematical Models ◽  
Focal Point ◽  
Load Factor ◽  
Focal Points ◽  
Practical Application ◽  
Transport Service ◽  
Transport Delay ◽  
Transport Services ◽  
Flow Intensity ◽  
The Given

The article focuses on the issues of organizing transport services for visitors of the focal points (FP) using individual transport (IT). The main factors influencing the generation of transport demand arising from the focal points functioning are considered. The authors present the mathematical models that allow assessing the following variables: the traffic flow intensity arising during the transport service of individual transport users both at the entrance to the focal point territory and at the exit from it; the value of the load factor of the given group of lanes at the signalized intersection; the value of delay that occurs when visiting focal units using individual transport. The authors elaborate recommendations for the practical application of the considered mathematical models while organizing transport services for focal points visitors using individual transport.

scholarly journals Building Resilience in Developing Countries Vulnerable to Large Natural Disasters

Policy Papers ◽  
2019 ◽  
Vol 19 (020) ◽  
pp. 1 ◽  
Author(s):  
◽  
◽  
◽  
Keyword(s):  
Risk Management ◽  
Developing Countries ◽  
Natural Disasters ◽  
Economic Cost ◽  
Cost Effective ◽  
Disaster Risk ◽  
Disaster Resilience ◽  
Social Resilience ◽  
Road Map ◽  
Post Disaster

This paper discusses how countries vulnerable to natural disasters can reduce the associated human and economic cost. Building on earlier work by IMF staff, the paper views disaster risk management through the lens of a three-pillar strategy for building structural, financial, and post-disaster (including social) resilience. A coherent disaster resilience strategy, based on a diagnostic of risks and cost-effective responses, can provide a road map for how to tackle disaster related vulnerabilities. It can also help mobilize much-needed support from the international community.

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