scholarly journals Estimation of the growth rate of wild ungulate populations in the territory of the Saratov region by the dynamic series of their numbers

2021 ◽  
pp. 293-309
Author(s):  
I. A. Kondratenkov ◽  
M. L. Oparin ◽  
O. S. Oparina ◽  
S. V. Sukhov
Keyword(s):  
Time Series ◽  
Separate Study ◽  
Large Mammals ◽  
High Quality ◽  
Wild Ungulate ◽  
Previous Level ◽  
Upper Level ◽  
Quality Of Approximation ◽  
Dynamic Series

The present paper is devoted to the study of the possibility of estimating the reproductive potentials of wild ungulate populations, and possibly other large mammals, by the time series of their numbers. We have found out that this is possible, which is confirmed by the high quality of approximation of the time series of abundance by logistic curves, and the corresponding coefficients of their determination for different species ranged from 75 to 96%. For such calculations, one circumstance is necessary, which is that the population of the studied species has been briefly exposed to some unfavorable factor causing a significant reduction in its numbers with subsequent restoration to the previous level, or the time series should contain a well-expressed and extended section of the transition of the population from some lower level to the upper level of the population, passing into a stationary state. The values of the maximum exponential growth rates of ungulate populations that we obtained do not fundamentally differ from the data available in other researchers’ works. In addition, it should be borne in mind that our method for assessing the reproductive potentials of ungulates is statistical, with features accompanying all such methods, for example, in the presence of statistical errors in all determined parameters. However, the evaluation of the magnitude of these errors is a topic for a separate study. 

scholarly journals Brewer spectrometer total ozone column measurements in Sodankylä

2016 ◽  
Vol 5 (1) ◽  
pp. 229-239 ◽  
Author(s):  
Tomi Karppinen ◽  
Kaisa Lakkala ◽  
Juha M. Karhu ◽  
Pauli Heikkinen ◽  
Rigel Kivi ◽  
...  
Keyword(s):  
Time Series ◽  
Total Ozone ◽  
Montreal Protocol ◽  
High Quality ◽  
Automatic Data ◽  
Mean Values ◽  
Total Ozone Column ◽  
Measurement Practices ◽  
Ozone Column

Abstract. Brewer total ozone column measurements started in Sodankylä in May 1988, 9 months after the signing of The Montreal Protocol. The Brewer instrument has been well maintained and frequently calibrated since then to produce a high-quality ozone time series now spanning more than 25 years. The data have now been uniformly reprocessed between 1988 and 2014. The quality of the data has been assured by automatic data rejection rules as well as by manual checking. Daily mean values calculated from the highest-quality direct sun measurements are available 77 % of time with up to 75 measurements per day on clear days. Zenith sky measurements fill another 14 % of the time series and winter months are sparsely covered by moon measurements. The time series provides information to survey the evolution of Arctic ozone layer and can be used as a reference point for assessing other total ozone column measurement practices.

Analysis of tropospheric parameter time series obtained with various types of GNSS antenna phase center models

2021 ◽  
Author(s):  
Katarzyna Stępniak ◽  
Grzegorz Krzan
Keyword(s):  
Time Series ◽  
Water Vapour ◽  
Anechoic Chamber ◽  
Parameter Determination ◽  
High Quality ◽  
Phase Center ◽  
Antenna Phase ◽  
Gnss Data ◽  
The Impact

<p>Water vapour is a key variable of the water cycle and plays a special role in many atmospheric processes controlling the weather and climate. Nowadays, extreme weather events, such as storms, floods, landslides, heat waves and droughts are the main concerns of society. The Global Navigation Satellite System (GNSS) is one of the few tools that can be used as an atmospheric water vapour sensor and, simultaneously, provide continuous, unbiased, precise and robust atmosphere condition information. A significant impact on the tropospheric parameter determination in the processing of satellite observations has undoubtedly GNSS antenna phase centers model.</p><p><br>Therefore, the aim of our study is to investigate the impact of different GNSS antenna calibration models on the quality of the tropospheric parameter series applied for climate applications. We analyse the zenith total delays (ZTD) obtained from GNSS data processing and afterwards converted integrated water vapour (IWV). Three years of GNSS data collected at 40 European Reference Frame (EUREF) Permanent GNSS Network (EPN) stations were processed with the NAPEOS software. Precise Point Positioning (PPP) technique utilizing European Space Agency (ESA) precise satellite orbits and clocks was used to estimate the parameters. Several different processing variants were processed and inter-compared. The first group of solutions was obtained by applying the International GNSS Service (IGS) type-mean Phase Center Correction (PCC) models. In the second and third groups of solutions, PCC models from respectively individual field robot calibration and calibration in an anechoic chamber were used. All solutions were processed using GPS and Galileo observations. Moreover, in order to validate and assess the quality of the GNSS solutions, the tropospheric parameters obtained from ERA5 reanalysis were compared with GNSS estimates. </p><p><br>In general, the results of the study show that the NAPEOS software can provide high quality GNSS tropospheric delay time series. The initial results indicate that the impact of applying different PCC model calibrations is not negligible. ZTD estimates obtained from variants using ROBOT and IGS14 calibration are closer to ERA5 than estimates from variants that used calibrations in an anechoic chamber. In addition, multi-GNSS processing variants are closer to ERA5 than GPS only or Galileo only processing variants. The results also depend on the equipment (receiver and antenna) of the stations. Validation against the data from climate reanalysis confirms that all GNSS approaches provide high-quality ZTD estimates. Furthermore, there is a high agreement in the IWV distributions between GNSS and ERA5.</p>

scholarly journals Brewer spectrometer total ozone column measurements in Sodankylä

2016 ◽  
Author(s):  
T. Karppinen ◽  
K. Lakkala ◽  
J. M. Karhu ◽  
P. Heikkinen ◽  
R. Kivi ◽  
...  
Keyword(s):  
Time Series ◽  
Reference Point ◽  
Total Ozone ◽  
Montreal Protocol ◽  
High Quality ◽  
Automatic Data ◽  
Mean Values ◽  
Total Ozone Column ◽  
Ozone Column

Abstract. Abstract. The Brewer total ozone column measurements started in Sodankylä in May 1988, 9 months after the agreement of The Montreal Protocol. The Brewer instrument has been well maintained and frequently calibrated since to produce a high quality ozone time series now spanning over 26 years. The data has now been uniformly reprocessed between 1988 and 2014. The quality of the data has been assured by automatic data rejection rules as well as by manual checking. The daily mean values calculated from highest quality direct sun measurements are available 77 % of time with up to 75 measurements per day on a clear day. Zenith sky measurements fill another 14 % of the time series and winter months are sparsely covered by moon measurements. The time series provides information to survey the evolution of Arctic ozone layer and can be used as a reference point for assessing other total ozone column measurement practises.

Fast Growing Firms ("Gazelles") and the Evolution of Russian Economy

2007 ◽  
pp. 85-100 ◽  
Author(s):  
A. Yudanov
Keyword(s):  
Natural Selection ◽  
Volterra Model ◽  
High Quality ◽  
Fast Growing ◽  
Russian Economy ◽  
Exponential Trend ◽  
Important Addition ◽  
Quality Of Approximation ◽  
Selection Of

The article is based on the empirical study of fast growing firms ("Gazelles") in Russia. Sales volumes of many such firms are growing in accordance with the precise exponential trend with surprisingly high quality of approximation. The author finds strong links between this phenomenon and the concentration of most of "Gazelles" in market niches where demand limitations are practically non-existent. Conscious, purposeful entrepreneurial search of free niches becomes under described conditions an important addition to the classic mechanism of evolution of the economy through the natural selection of random changes. The author’s approach to these processes is based on a modification of the well known Lotka-Volterra model.

scholarly journals Modeling Multivalued Dynamic Series of Financial Indexes on the Basis of Minimax Approximation

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 366
Author(s):  
Zahid Mamedov ◽  
Irina Vygodchikova ◽  
Ayaz Aliev ◽  
Lira Gurieva ◽  
Natalia Rud
Keyword(s):  
Time Series ◽  
Financial Markets ◽  
Energy Policy ◽  
Spline Approximation ◽  
Applied Approach ◽  
Dynamic Series ◽  
Important Basis ◽  
Statistical Indicators

In this article, the problem of modeling a time series using the Minimax method is considered. The expediency of using Minimax to identify points of change in trends and the range of changes in the graphical figures of technical analysis is justified. Spline approximation of the dynamic process with range constraints was performed to improve the quality of the model. Investors are advised to refrain from making hasty decisions in favor of holding reliable shares (such as PJSC Novatek shares), rather than selling them. The purchase of new shares should be carefully analyzed. Through an approximation of the dynamic number of the applicable optimization problem of minimizing the maximum Hausdorff distances between the ranges of the dynamic series and the values of the approximating function, the applied approach can provide reliable justification for signals to buy shares. Energy policy occupies the highest place in the list of progress ratings according to news analytics of businesses related to the energy sector of the economy. At the same time, statistical indicators and technologies of expert developments in this field, including intellectual analysis, can become an important basis for the development of a robotic knowledge program in the field under study, an organic addition to which is the authors’ methodology of development in energy economics as in energy policy. This paper examines the model of approximation of the multivalued time series of PJSC Novatek, represented as a series of ranges of numerical values of the indicators of financial markets, with constraints on the approximating function. The authors consider it advisable for promising companies to apply this approach for successful long-term investment.

scholarly journals Peran dan Mutu Pelaksanaan Pembelajaran oleh Guru di Satuan Pendidikan Tingkat Atas

2021 ◽  
Author(s):  
Zulhafizh Zulhafizh
Keyword(s):  
Correlation Method ◽  
Quality Standard ◽  
Learning Objectives ◽  
Descriptive Statistics ◽  
High Quality ◽  
Analysis Technique ◽  
Upper Level ◽  
High Quality Standard ◽  
Very High

The purpose of research to analyze the implementation of the role and the quality of learning carried out by teachers in upper-level education units. This research uses descriptive correlation method. The research sample consisted of 142 people who were spread across several upper level education units in Siak Regency, Riau Province. The instrument used for data collection was a Likert scale questionnaire. The analysis technique uses descriptive statistics, Product Moment correlation, normality, and anova. The results showed that all the actions taken had a significant role, namely reaching 47.8%, while 52.3% was determined by other factors. All activities carried out have an influence on the form of learning. The implementation of learning carried out in the upper level education unit has a very high quality standard. The teachers have taken appropriate actions to achieve learning objectives. The ability and skills of teachers in carrying out their duties are a means of realizing productive learning.

scholarly journals PENAWARAN EKSPOR PANILI INDONESIA

2020 ◽  
Vol 10 (2) ◽  
pp. 41
Author(s):  
NYAK ILHAM ◽  
SRI HASTUTI SUHARTINI ◽  
BONAR M. M. SINAGA
Keyword(s):  
Time Series ◽  
Secondary Data ◽  
Negative Effects ◽  
High Quality ◽  
Export Prices ◽  
Long Run ◽  
Domestic Prices ◽  
Econometric Analyses ◽  
The U.S

<p>Panili Indonesia sudah dikenal di pasar intenasional dengan nama Java Vanilla Beans dengan kualitas yang cukup baik. Masalahnya mampukah Indonesia mempertahankan kontinuitas penawarannya sesuai dengan kualitas yang diinginkan pasar. Penelitian ini betujuan mcnganalisis: (1) kinerja penawaran atau produksi melalui peilaku luas areal dan produktivitas tanaman panili; (2) peilaku penawaran ekspor komoditas panili ke Jcrman dan Amerika Seikat (AS); dan (3) peilaku harga domestik dan harga ekspor komoditas panili. Data yang digunakan merupakan data sckundcr rentang waktu (lime series) tahunan: 1975 - 2000 pada tingkat nasional dan intenasional. Analisis data menggunakan pendekatan ckonometik dengan metode 2SLS. Hasil analisis menyimpul- kan: (1) luas tanam menghasilkan dipengaruhi oleh upah tenaga kerja secara ncgatif dalam jangka pendek luas tanaman menghasilkan belum rcsponsif terhadap perubahan tingkat upah, akan tetapi dalam jangka panjang menjadi responsif, (2) produktivitas panili dipengaruhi secara positif oleh harga panili domestik, namun produktivitas tidak rcsponsif terhadap perubahan harga; (3) ekspor panili Indonesia ke Jcrman dan AS dipengaruhi oleh ekspor tahun sebelumnya. Hal ini menginformasikan bahwa kegiatan ekspor tersebut terkait dengan kepcrcayaan antara ekspotir Indonesia dengan importir Jerman dan AS; (4) transmisi harga ekspor ke harga yang diteima petani sangat lemah, sementara transmisi harga dunia ke harga ekspor cukup erat Hal ini dapat dilihat dai tidak adanya pengaruh harga ekspor terhadap harga domestik, sedangkan harga ekspor sangat dipengaruhi oleh harga dunia; (5) upaya pengembangan panili di Indonesia lebih diarahkan pada peningkatan kualitas hasil, perluasan tanaman yang berlcbihan hendaknya memperhatikan kecenderungan permintaan ekspor; (6) untuk menjaga pangsa pasar panili Indonesia di pasar intenasional hendaknya tetap meningkatkan daya saing, baik dai segi kualitas maupun harga.</p><p>Kata kunci: Panili, ekspor, Java vanilla, Indonesia, penawaran<br /><br /></p><p><strong>ABSTRACT</strong><br /><br /><strong>Indonesian Vanilla Expots</strong><br /><br />Indonesian vanilla, Java Vanilla Beans, is widely known in intenational market. It is also regarded as high quality vanilla. The main concen for Indonesian expoters is to fulill the continuity of the supply for the quality as demanded. This study aims to analyze: (1) the effects of acreage and yields on supply and production of Indonesian vanilla; (2) the exports of Indonesian vanilla to Germany and the U.S.; (3) the domestic pices and export prices of Indonesian vanilla. This study used secondary data, time series rom 1975 to 2000 both national and intenational data. Econometric analyses using 2SLS was used in this study. The results are as follow: (1) the wages have negative effects on the acreage, in the shot run the acreage does not respond to wage changes; however, in the long run it does respond to wage changes; (2) the domestic prices positively affect on the yields, however, yields do not respond to price changes; (3) the previous expots affect on the current exports to Germany and the U.S., it shows that there is a cetain relationship between Indonesian expoters and German and the U.S. importers; (4) the expot pices weakly transmit to farmer level prices, moreover, intenational prices strongly transmit to the expot prices. It is shown by the absence of the effects of the expot pices on the domestic prices. Meanwhile intenational prices highly affects on the export prices; (5) the efforts to develop vanilla industry in Indonesia are concentrated on increasing quality of Indonesian vanilla, the addition of the acreage should consider the expot demand; (6) <br /><br />competitiveness of Indonesian vanilla should be maintained and improved to sustain and gain the market share.<br /><br />Key words : Vanilla, Java vanilla, Indonesia, expot, supply</p>

Influence of technology parameters of free-cutting steel continuous casting on the billet internal structure

2020 ◽  
Vol 76 (2) ◽  
pp. 139-142
Author(s):  
A. T. Kunakbaeva ◽  
A. M. Stolyarov ◽  
M. V. Potapova
Keyword(s):  
Regression Analysis ◽  
Continuous Casting ◽  
Internal Structure ◽  
Sulfur Content ◽  
Manganese Content ◽  
High Quality ◽  
Correlation And Regression Analysis ◽  
Cutting Steel ◽  
Continuously Cast

Free-cutting steel gains specific working properties thanks to the high content of sulfur and phosphorus. These elements, especially sulfur, have a rather high tendency to segregation. Therefore, segregation defects in free-cutting steel continuously cast billets can be significantly developed. The aim of the work was to study the influence of the chemical composition of freecutting steel and casting technological parameters on the quality of the macrostructure of continuously cast billets. A metallographic assessment of the internal structure of cast metal made of free-cutting steel and data processing by application of correlation and regression analysis were the research methods. The array of production data of 43 heats of free-cutting steel of grade A12 was studied. Steel casting on a five-strand radial type continuous casting machine was carried out by various methods of metal pouring from tundish into the molds. Metal of 19 heats was poured with an open stream, and 24 heats – by a closed stream through submerged nozzles with a vertical hole. High-quality billets had a cross-sectional size of 150×150 mm. The macrostructure of high-quality square billets made of free-cutting steel of A12 grade is characterized by the presence of central porosity, axial segregation and peripheral point contamination, the degree of development of which was in the range from 1.5 to 2.0 points, segregation cracks and strips – about 1.0 points. In the course of casting with an open stream, almost all of these defects are more developed comparing with the casting by a closed stream. As a result of correlation and regression analysis, linear dependences of the development degree of segregation cracks and strips both axial and angular on the sulfur content in steel and on the ratio of manganese content to sulfur content were established. The degree of these defects development increases with growing of sulfur content in steel of A12 grade. These defects had especially strong development when sulfur content in steel was of more than 0.10%. To improve the quality of cast metal, it is necessary to have the ratio of the manganese content to the sulfur content in the metal more than eight.

Experience of clinical testing of personal telemedicine system ‘Obereg’ for remote monitoring of patients in intensive care units

2020 ◽  
pp. 52-58 ◽  
Author(s):  
A. A. Eryomenko ◽  
N. V. Rostunova ◽  
S. A. Budagyan ◽  
V. V. Stets
Keyword(s):  
Intensive Care ◽  
Intensive Care Units ◽  
Remote Monitoring ◽  
Clinical Testing ◽  
Transportation Of Patients ◽  
High Quality ◽  
Telemedicine System ◽  
Accuracy Of Measurements ◽  
Hospital Equipment

The experience of clinical testing of the personal telemedicine system ‘Obereg’ for remote monitoring of patients at the intensive care units of leading Russian clinics is described. The high quality of communication with the remote receiving devices of doctors, the accuracy of measurements, resistance to interference from various hospital equipment and the absence of its own impact on such equipment were confirmed. There are significant advantages compared to stationary patient monitors, in particular, for intra and out-of-hospital transportation of patients.

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