Failure Time Models Based on Degradation Processes

2009 ◽  
pp. 209-233 ◽  
Author(s):  
Axel Lehmann
Keyword(s):  
Failure Time ◽  
Degradation Processes

Transformation of evaluation criteria of lands withdrawn from agricultural turnover due to radioactive contamination

2020 ◽  
pp. 23-27
Author(s):  
Olga Merzlova
Keyword(s):  
Economic Evaluation ◽  
Radioactive Contamination ◽  
Chernobyl Accident ◽  
Evaluation Criteria ◽  
Contaminated Land ◽  
Degradation Processes ◽  
Agricultural Use ◽  
Land Clearance

One of the measures to eliminate the consequences of the Chernobyl accident was the exclusion of highly contaminated land from agricultural use. Due to the positive dynamics of the radiation situation, the issue of land return becomes relevant. However, in the period of exclusion of these lands the land clearance degradation processes were developing. The second part of the article is devoted to the issue of economic evaluation of the expediency of land return and the mutual coordination of the results of separate stages of complex ecological and economic evaluation. The research was carried out in Mogilev branch Institute of radiology (Republic of Belarus).

Ukrainian Chernozem Fertility Reproduction under Soil Conservation Agriculture

2020 ◽  
pp. 67-79
Author(s):  
Yu. Kravchenko
Keyword(s):  
Soil Conservation ◽  
Agricultural Land ◽  
Crop Yields ◽  
Conservation Agriculture ◽  
Instructional Materials ◽  
Cultivated Plants ◽  
Forest Steppe ◽  
Typical Chernozem ◽  
Degradation Processes ◽  
Biological Potential

In Ukraine 57.5 % of agricultural land is subjected to erosion with 10–24 million tons of humus, 0.3–0.96 million tons of nitrogen, 0.7–0.9 million tons of phosphorus and 6–12 million tons of potassium lost annually. Degradation processes are also common on chernozems, which cover about 60 % of the Ukrainian territory. The aim of the research is to defi ne the most eff ective soil conservation practices and legislative decisions aimed to conservation/recovering the Ukrainian chernozem fertility. The experimental data of the agrochemical certifi cation of Ukrainian lands, data from scientifi c papers, stock and instructional materials as well as our own fi eld and laboratory studies were used. It has been established that the long-term use of deep subsurface tillage on typical chernozem increases, compared with plowing, the content of 10–0.25 mm of air-dry and water-resistant aggregates, the bulk density, soil water storages, water infi ltration rates, the content of mobile phosphorus and exchangeable potassium, pHH2O, CaCO3 stocks, the contents of humic and fulvic acids, molecular weights of humic acids – by 5.5 and 3.06 %; 0.05 g/cm3; 25.5 mm; 22.6 mm/h; 0.1 and 3 mg/100 g of soil; 0.03 pHH2O; 18 t/ha, 0.02 and 0.04 %, 91195 kDa, respectively. Fertilizers may contribute to the crop yields increase from by 60% in the Polissya, by 40 % – in the Forest Steppe, by 15 % – in the Wet Steppe, by 10 % – in the Dry Steppe and by 40 % – in the Irrigated Steppe areas. In soil-conservation rotations, the crop placement and alternation are advisable to combine with strips or hills sowing, taking into account the local relief features; soil alkalinization, applying anti-erosion structures. Ukrainian agriculture will receive additional 10–12 million tons of forage units or 20–22 % from all fodder in a fi eld agriculture under increasing 8–10 % of arable lands for intercrops. It is advisable to mulch the eroded chernozems of Ukraine depending on their texture composition: 1.3 t/ha of mulch for sandy and loamy soils, 1.9 t/ha – for sandy and 1.1 t/ha – for loamy soils. The implementation of soil conservation agriculture can minimize some soil degradation processes and improve eff ective soil properties required to realize the biological potential of cultivated plants. Key words: chernozem, degradation, fertility, soil conservation technologies, agriculture policy.

EVALUATION OF THE RELIABILITY OF COMPLEX TECHNICAL RECONFIGURATION SYSTEMS BY STATISTICAL MODELING METHOD

2019 ◽  
pp. 84-88
Author(s):  
A.Yu. Kulakov
Keyword(s):  
Normal Distribution ◽  
Statistical Modeling ◽  
Quantitative Estimate ◽  
Failure Time ◽  
Modeling Method ◽  
System Failure ◽  
Similar System ◽  
Orbit Control ◽  
Reliability Characteristics ◽  
Complex Technical System

Goal. Assess the reliability of a complex technical system with periodic reconfiguration and compare the results obtained a similar system, but without reconfiguration. Materials and methods. In this article uses the method of statistical modeling (Monte Carlo) to assess the reliability of complex system. We using the normal and exponential distribution of failure time for modeling failures of system elements. Reconfiguration algorithm is the algorithm proposed for the attitude and orbit control system of spacecraft. Results. A computer program has been developed for assessing reliability on the basis of a statistical modeling method, which makes it possible to evaluate systems of varying complexity with exponential and normal distribution, as well as with and without periodic reconfiguration. A quantitative estimate of the reliability as a function of the probability of system failure is obtained. Conclusion. It has been demonstrated that a system with reconfiguration has the best reliability characteristics, both in the case of exponential and normal distribution of failures.

DEVELOPMENT OF “LUMPED MASS DAMPER MODEL“ TO PREDICT FAILURE TIME AND VELOCITY OF LANDSLIDE

2018 ◽  
Author(s):  
Hideaki Marui ◽  
Eisaku Hamasaki ◽  
Gen Furuya
Keyword(s):  
Failure Time ◽  
Lumped Mass ◽  
Mass Damper

State of preservation of the Red Barracks of the Owcza Góra Fort

2020 ◽  
Vol 15 (1) ◽  
pp. 90-103
Author(s):  
Bartosz Szostak ◽  
Maciej Trochonowicz
Keyword(s):  
Laboratory Tests ◽  
Degradation Processes ◽  
The Hill

This paper is devoted to the object of the Red Barracks of the Owcza Góra Fort, which is located in Kłodzko. The building was erected as an external fort of the Kłodzko Fortress enabling observation of the foregrounds and protecting the hill from which the main fortress could be fired. The study presents the condition of the object, which has been unused for several decades and is subjected to destruction and degradation processes. The paper presents the results of inventory works, technical and laboratory tests.

Correlation analysis of software failure time data

2010 ◽  
Vol 30 (3) ◽  
pp. 600-602
Author(s):  
Jun-gang LOU ◽  
Jian-hui JIANG
Keyword(s):  
Correlation Analysis ◽  
Failure Time ◽  
Failure Time Data ◽  
Time Data ◽  
Software Failure

The Influence of Some Factors on Spirolactone Stability in Solution

2008 ◽  
Vol 59 (7) ◽  
Author(s):  
Daniela Lucia Muntean ◽  
Silvia Imre ◽  
Cosmina Voda
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Uv Irradiation ◽  
High Performance ◽  
Degradation Products ◽  
Simultaneous Action ◽  
Ethanolic Solution ◽  
Degradation Processes ◽  
Stable Solutions ◽  
Preformulation Study

The influence of some factors on spironolactone stability in solution was studied, by applying high-performance liquid chromatography, as a part of a pharmaceutical preformulation study in order to obtain a spironolactone solution for alopecia treatment. Solutions of 1 mg/ml spironolactone in aqueous ethanolic solution 1 : 1 and in 20 mM cyclodextrines solutions (b-, hydroxi-b- and methyl-b-cyclodextrine) was used, maintained at 8 and 22 �C, protected from light and after UV irradiation at 254 nm. The main degradation products were 7a-thiospirolactone and canrenone. The most stable solutions were the alcoholic ones and with methyl-beta-cyclodextrine, but the simultaneous action of temperature and UV irradiation allowed degradation processes after one hour of exposure, more aggressive in the presence of methyl-beta-cyclodextrine. In conclusion, for alopecia treatment with spironolactone a 1 mg/mL ethanolic solution could be used and it is recommendable the protection of treated zone.

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