Some approaches to mathematics modeling of pome crops yielding ability

2019 ◽  
pp. 207-211
Author(s):  
V. A. Shishkin ◽  
E. P. Rybalkin ◽  
A. I. Sotnik
Keyword(s):  
Mathematical Modeling ◽  
Relative Humidity ◽  
Mathematical Models ◽  
Software Package ◽  
Morphological Characteristics ◽  
Factors Affecting ◽  
Yielding Ability ◽  
Multiple Factors ◽  
Main Factors ◽  
Maximum Minimum

The analysis of methods of mathematical modeling of pome crops on the example of studying 5 varietal samples of pears, taking into account the factors affecting the yielding ability. 15 main factors were considered, such as: maximum, minimum and average temperatures, relative humidity, incidence of chlorosis, drought resistance, morphological characteristics. Mathematical analysis with the construction of mathematical models was carried out using the software package Matlab. As a result, mathematical models characterizing the influence of both individual and multiple factors on the yielding ability of pear cultivars were obtained.

METHODOLOGICAL APPROACH TO FORECASTING THE COSTS OF CREATING AN AUTOMATED RATING SYSTEM

2021 ◽  
Vol 2 (10) ◽  
pp. 21-26
Author(s):  
Anastasia S. Krasnikova ◽  
◽  
Alexander G. Podolsky ◽  
Keyword(s):  
Mathematical Models ◽  
Methodological Approach ◽  
Rating System ◽  
Automated System ◽  
Factors Affecting ◽  
Planning Decisions ◽  
Main Factors ◽  
The Cost

The article presents a methodological approach to forecasting the costs of creating an auto-mated rating system, which allows taking into account the costs of development, production and installation of its components. Economic and mathematical models are presented that take into account the main factors affecting the cost of creating components of an automated system, allowing to obtain adequate forecast esti-mates for making informed planning decisions.

scholarly journals Assessment of reliability predictions of the reverberation time by using the architectonic software package Ecotect

2017 ◽  
Vol 15 (3) ◽  
pp. 359-370
Author(s):  
Miomir Vasov ◽  
Dragan Cvetkovic ◽  
Veliborka Bogdanovic ◽  
Igor Bjelic
Keyword(s):  
Software Package ◽  
Acoustic Analysis ◽  
Reverberation Time ◽  
Acoustic Response ◽  
Acoustic Parameters ◽  
Factors Affecting ◽  
Indoor Space ◽  
Multiple Factors ◽  
Finish Material ◽  
Room Volume

Contemporary architectonic design mostly relies on the software tools which enable the engineers to analyze multiple factors affecting a space, and to timely detect and correct certain errors in designing, resulting from attempting to satisfy certain aspects of a space at the expense of others. Those tools which apart from architecture itself also consider other fields of science, depending on the function of these areas are important; thus in the lecture halls designing process, adequate software for analysis is used. In addition to a number of acoustic parameters characterizing the acoustic response of a room, in terms of design, one of the most important factors affecting the acoustics of the indoor areas is reverberation time, which is characterized by the architectonic parameters: room volume (dimensions), shape (form) and materialization (finish material). In this paper, for the purposes of acoustic analysis of the A amphitheater, the parametric values obtained in two ways, by experimental measuring and by software - Autodesk Ecotect and Autodesk Revit Architecture are compared. The software is increasingly used in contemporary architectonic software because of the option to analyze acoustics of indoor space, so there is a need to analyzed the values provided by the software and compare them with actually measured reverberation time.

scholarly journals Mathematical modeling and experimental working off of gas-liquid systems for separation of reactive shells on the basis of the matmech program package

2019 ◽  
Vol 21 (1) ◽  
pp. 47-53
Author(s):  
S. Boychun
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Models ◽  
Software Package ◽  
Defense Industry ◽  
General Information ◽  
Program Package ◽  
Separation Systems ◽  
Liquid Systems

This paper presents general information about the complex of mathematical models and experimental working off of separation systems of reactive shells based on the MATMECH software package. The article may be useful for scientific and technical workers of the defense industry.

scholarly journals Variation Characteristics and Influencing Factors of Soil Moisture Content in the Lime Concretion Black Soil Region in Northern Anhui

Water ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2251
Author(s):  
Mingcheng Du ◽  
Jianyun Zhang ◽  
Amgad Elmahdi ◽  
Zhenlong Wang ◽  
Qinli Yang ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Relative Humidity ◽  
Moisture Content ◽  
Soil Moisture Content ◽  
Crop Growth ◽  
Groundwater Depth ◽  
Factors Affecting ◽  
Moisture Variation ◽  
Main Factors ◽  
Soil Moisture Variation

Soil moisture content (SMC) is an important factor affecting crop growth. Based on the field SMC data measured at the Wudaogou experimental station from 1989 to 2019, two typical crop types, wheat and maize, were selected. By combining the groundwater depth, crop growth period, and meteorological factors in the same period, and using classical statistics and redundant analysis (RDA) methods, the characteristics and influencing factors of SMC changes in vertical profiles of different crops were compared and analyzed. The results showed that the SMC and average daily water storage of wheat were greater than that of maize. The crop growth mainly consumed 0–60 cm SMC. The SMC in this area was moderately variable; the SMC of 0–30 cm belongs to the active layer, and the SMC of 30–100 cm belongs to the sub-active layer. The RDA method identified ground temperature, groundwater depth, relative humidity, and the wheat growing period as the main factors affecting soil moisture variation in wheat fields; groundwater depth, relative humidity, and water vapor pressure differences were the main factors affecting soil moisture variation in maize fields. The results can provide a basis for accurate prediction of soil water dynamics and thus provide a reference for irrigation decision-makers.

Recent Rapid Climate Changes in Antarctic and their Influence on Low Diversity Ecosystems

2010 ◽  
Vol 17 (1) ◽  
pp. 17-30 ◽  
Author(s):  
Katarzyna J. Chwedorzewska
Keyword(s):  
Environmental Variables ◽  
Climate Changes ◽  
Biological Significance ◽  
Global Changes ◽  
Factors Affecting ◽  
Low Diversity ◽  
Main Factors ◽  
The Antarctic ◽  
High Diversity ◽  
Temperature Water

ABSTRACTThe geographic position, astronomic factors (e.g. the Earth’s maximum distance from the Sun during winter), ice cover and altitude are the main factors affecting the climate of the Antarctic, which is the coldest place on Earth. Parts of Antarctica are facing the most rapid rates of anthropogenic climate change currently seen on the planet. Climate changes are occurring throughout Antarctica, affecting three major groups of environmental variables of considerable biological significance: temperature, water, UV-B radiation.Low diversity ecosystems are expected to be more vulnerable to global changes than high diversity ecosystems

Characteristics of the course of nephritis associated with Iga-vasculitis Henoch-Schoenlein in children

2020 ◽  
Vol 24 (3) ◽  
pp. 64-71
Author(s):  
A. V. Sukalo ◽  
I. A. Kazyra
Keyword(s):  
Clinical Laboratory ◽  
Morphological Changes ◽  
Pediatric Nephrology ◽  
Morphological Characteristics ◽  
Lymphocyte Activation ◽  
Renal Tissue ◽  
Kidney Damage ◽  
Iga Vasculitis ◽  
Factors Affecting ◽  
Treatment Regimens

INTRODUCTION. Among systemic vasopathies in children, IgA vasculitis Henoch Schoenlein (HS) is the most common, according to various authors, kidney damage is noted in 25-80 % and usually determines the prognosis of the disease.THE AIM of the study was to analyze clinical, laboratory, immunological, morphological characteristics, features of the course and treatment of nephritis associated with IgA vasculitis HS in children, as well as factors affecting the prognosis.PATIENTS AND METHODS. The study included 31 patients with morphologically verified nephritis due to IgA vasculitis HS (18 – boys, 13 – girls) aged 3 to 17 years, who were monitored at the Nephrology Department of the "2nd Children's City Clinical Hospital" of the National Center for Pediatric Nephrology and Renal Replacement therapy in Minsk from 2010 to 2019 yrs.The following parameters were analyzed: the clinical variant of kidney damage, laboratory tests (including the study of BAFF, RANTES lymphocyte activation molecules, pro-inflammatory IL1β, caspase1, TNFα, growth factors VEGF, TGF), 24 hours monitoring and office blood pressure measurements, ECHO cardiography with indicescalculation, ultrasound of the carotid arteries with the thickness of intima-media complex, morphological changes in the renal tissue, as well as treatment regimens.RESULTS. The contribution of deGal-IgA1, markers of T and B lymphocytes activation, pro-inflammatory and profibrotic molecules in the development of the disease is shown. Arterial hypertension was registered in 42 % of children, signs of heart remodeling according to the calculated indices in 19,3 %. Decrease level of adiponectin, vitamin D, leptin, increase concentration of obestatin, Pro-BNP, hs-CRP, and TSAT indicator classify patients with nephritis due to IgA vasculitis HS at moderate risk for the developmentof cardio-vascular disorders, which suggests the need for timely correction.CONCLUSION. In most cases, nephritis with IgA vasculitis HS has a benign course with rare relapses and progression to the end stage of chronic kidney disease (6,5 %).

Simulation of non-stationary thermal fields from a buried thermally insulated pipeline and its diagnostics

2007 ◽  
Vol 5 ◽  
pp. 127-132
Author(s):  
N.A. Vaganova
Keyword(s):  
Thermal Imaging ◽  
Software Package ◽  
Clay Soil ◽  
Underground Pipeline ◽  
Main Pipeline ◽  
Factors Affecting ◽  
Thermal Fields ◽  
Thermal Imaging Equipment ◽  
Principal Possibility ◽  
Significant Factors

To detect damage to the underground pipeline, a mathematical model, allowing to take into account the most significant Factors affecting the distribution of temperature on the day surface. To implement this model, a software package has been developed and results of numerical calculations. With the help of these calculations, in particular, It is established that modern thermal imaging equipment has a principal possibility to determine an unauthorized frame in the main pipeline at a depth of two meters in clay soil.

Pitting Corrosion of Biomedical Titanium and Titanium Alloys: A Brief Review

2020 ◽  
Vol 16 ◽  
Author(s):  
Yu-Wei Cui ◽  
Liang-Yu Chen ◽  
Xin-Xin Liu
Keyword(s):  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
Potential Temperature ◽  
Growth Stages ◽  
Factors Affecting ◽  
Ti Alloys ◽  
Pitting Corrosion Resistance ◽  
Superior Mechanical Properties ◽  
Good Biocompatibility ◽  
Main Factors

Abstract:: Thanks to their excellent corrosion resistance, superior mechanical properties and good biocompatibility, titanium (Ti) and Ti alloys are extensively applied in biomedical fields. Pitting corrosion is a critical consideration for the reliability of Ti and Ti alloys used in the human body. Therefore, this article focuses on the pitting corrosion of Ti and Ti alloys, which introduces the growth stages of pitting corrosion and its main influencing factors. Three stages, i.e. (1) breakdown of passive film, (1) metastable pitting, and (3) propagation of pitting, are roughly divided to introduce the pitting corrosion. As reviewed, corrosive environment, applied potential, temperature and alloy compositions are the main factors affecting the pitting corrosion of Ti and Ti alloys. Moreover, the pitting corrosion of different types Ti alloys are also reviewed to correlate the types of Ti alloys and the main factors of pitting corrosion. Roughly speaking, β-type Ti alloys have the best pitting corrosion resistance among the three types of Ti alloys.

scholarly journals Measuring the Efficiency of Football Clubs Using Data Envelopment Analysis: Empirical Evidence From Spanish Professional Football

SAGE Open ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 215824402198925
Author(s):  
Isidoro Guzmán-Raja ◽  
Manuela Guzmán-Raja
Keyword(s):  
Data Envelopment Analysis ◽  
High Efficiency ◽  
Sport Performance ◽  
Data Envelopment ◽  
Professional Football ◽  
Efficiency Measure ◽  
Factors Affecting ◽  
Football Clubs ◽  
Main Factors ◽  
Using Data

Professional football clubs have a special characteristic not shared by other types of companies: their sport performance (on the field) is important, in addition to their financial performance (off the field). The aim of this paper is to calculate an efficiency measure using a model that combines performance (sport and economic) based on data envelopment analysis (DEA). The main factors affecting teams’ efficiency levels are investigated using cluster analysis. For a sample of Spanish football clubs, the findings indicate that clubs achieved a relatively high efficiency level for the period studied, and that the oldest teams with the most assets had the highest efficiency scores. These results could help club managers to improve the performance of their teams.

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