scholarly journals Methodology for Identifying the Boundaries of Agglomerations based on Statistical Data

2021 ◽  
Vol 17 (1) ◽  
pp. 44-58
Author(s):  
D.E. Tolmachev Tolmachev ◽  
Pavel D. Kuznetsov ◽  
Sergey V. Ermak
Keyword(s):  
Statistical Data ◽  
Population Distribution ◽  
Mutual Influence ◽  
Sverdlovsk Oblast ◽  
Russian Regions ◽  
Circular Migration ◽  
Settlement System ◽  
Data Set ◽  
Significant Difference ◽  
The Difference

Significant difference in development between the municipalities is an obstacle for achieving economic sustainability in many Russian regions. Regional development strategies and plans of various municipalities often cannot be synchronised because of their incompatibility. Moreover, municipalities usually lack necessary resources to implement their strategies. To solve these problems, we identified groups of municipalities (key units of the settlement system (KUSS)) based on the existing socio-eco- nomic relations, common challenges and development potential. We propose a methodology for identifying KUSS and describe its application. This methodology relies on statistical data available at the municipal level. To assess the interconnection of municipalities, we used 6 statistical socio-economic indicators and 1 integrated index of Gross Municipal Product (GMP). The difference in the first 6 indicators of the development of municipalities demonstrated, that less developed municipalities tend to more developed ones. We used the values of gross municipal product to define high mutual attraction of large municipalities (similar to the gravity model). The distance between municipalities reduced their mutual influence. Due to the limited data set, it was necessary to consider the reliability of the identified inter-municipal relations. Thus, we compared the obtained results with empirical data on population distribution and circular migration between municipalities in the region. The comparison of our calculations and actual data showed high precision of the presented methodology. The resulting grouping of municipalities allowed identifying 21 key units of the settlement system in Sverdlovsk oblast. The proposed methodology can be used for deter- mining large groups of municipalities in Sverdlovsk oblast, as well as in other Russian regions.

scholarly journals Modelling the Heterogeneity of the Mutual Influence between Russian Regions in the Manufacturing Industry

2021 ◽  
Vol 17 (3) ◽  
pp. 944-955
Author(s):  
Mikhail B. Petrov ◽  
Leonid А. Serkov ◽  
Кonstantin B. Kozhov
Keyword(s):  
Manufacturing Industry ◽  
Mutual Influence ◽  
Methodological Approach ◽  
Ordinary Least Squares ◽  
Interaction Matrix ◽  
Sverdlovsk Oblast ◽  
Russian Regions ◽  
Factors Affecting ◽  
Interregional Interaction ◽  
The Impact

As factors affecting interregional interactions play an important role in regional economic development. Thus, developing a methodology for assessing these interactions is becoming urgent. The article proposes a methodological approach to analyse the factors influencing possible interactions between Sverdlovsk oblast and other constituent entities of the Russian Federation in the manufacturing industry. It is hypothesised that the elements of an interregional interaction matrix are proxy variables characterising the degree of this interaction. An economic analysis of relations and production chains between Sverdlovsk oblast and other constituent entitles confirmed this hypothesis. First, based on the spatial distribution of manufacturing output in the examined regions, values of an indicator showing the strength of their mutual influence were determined. Second, the impact of economic, infrastructural and institutional factors on the obtained indicator, characterising the inter action between Sverdlovsk oblast and other regions, was assessed using quantile regression. In this case, such a technique was chosen instead of the classical ordinary least squares (OLS) regression that incorrectly estimates the dependencies between the studied variables. This is expressed in the fact that the regression coefficients de pend on q-quantile of the dependent variable. We have revealed that price levels of the examined regions do not affect their possible interactions with Sverdlovsk oblast. Simultaneously, the dissemination of knowledge acts a driver of interaction between the considered regional manufacturing industries. The research findings can be used to prepare strategies, programmes and schemes for the placement and development of industries, considering the potential of Sverdlovsk oblast and other Russian regions.

scholarly journals The Coefficient of Variation of Step Time Can Overestimate Gait Abnormality: Test-Retest Reliability of Gait-Related Parameters Obtained with a Tri-Axial Accelerometer in Healthy Subjects

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 577 ◽  
Author(s):  
Shunrou Fujiwara ◽  
Shinpei Sato ◽  
Atsushi Sugawara ◽  
Yasumasa Nishikawa ◽  
Takahiro Koji ◽  
...  
Keyword(s):  
Coefficient Of Variation ◽  
Intraclass Correlation ◽  
Step Length ◽  
Gait Parameter ◽  
Data Set ◽  
Gait Abnormality ◽  
Significant Difference ◽  
Assessment Time ◽  
The Difference ◽  
Gait Abnormalities

The aim of this study was to investigate whether variation in gait-related parameters among healthy participants could help detect gait abnormalities. In total, 36 participants (21 men, 15 women; mean age, 35.7 ± 9.9 years) performed a 10-m walk six times while wearing a tri-axial accelerometer fixed at the L3 level. A second walk was performed ≥1 month after the first (mean interval, 49.6 ± 7.6 days). From each 10-m data set, the following nine gait-related parameters were automatically calculated: assessment time, number of steps, stride time, cadence, ground force reaction, step time, coefficient of variation (CV) of step time, velocity, and step length. Six repeated measurement values were averaged for each gait parameter. In addition, for each gait parameter, the difference between the first and second assessments was statistically examined, and the intraclass correlation coefficient (ICC) was calculated with the level of significance set at p < 0.05. Only the CV of step time showed a significant difference between the first and second assessments (p = 0.0188). The CV of step time also showed the lowest ICC, at <0.50 (0.425), among all parameters. Test–retest results of gait assessment using a tri-axial accelerometer showed sufficient reproducibility in terms of the clinical evaluation of all parameters except the CV of step time.

Assessment of Acidogenicity of Commercially Available Biscuits on Salivary pH - An in vivo Study

2020 ◽  
pp. 139-147
Author(s):  
B. Vivek Babu ◽  
Jayashri Prabakar
Keyword(s):  
Simple Random Sampling ◽  
In Vivo Study ◽  
Data Set ◽  
Group I ◽  
Significant Difference ◽  
Salivary Ph ◽  
The Difference ◽  
Group 2 ◽  
Inorganic Molecules

Saliva is a complex secretion consisting of 99% of water and remaining 1% of organic and inorganic molecules. Sucrose and starches are the predominant dietary carbohydrates in modern societies. Among all the foods consumed by children, chocolates and biscuits are the most common. Therefore this present in vivo study was conducted to assess the acidogenic effect of commercially available biscuits on salivary pH among 10 to 15 years old children. Study Design used in the study was In Vivo clinical study (Pilot Trail). The population collected in the survey was children between the age group of 10 - 15 years old children. 4 Groups were considered and 10 in each group. Group 1: Hide and Seek, Group 2: Good Day, Group 3: Dream and Cream, Group 4: Oreo. Sampling method used in the study was conducted as simple random sampling. Ethical approval of the study was obtained from Saveetha Institutional Review Board. Informed consent of the children were obtained from the parents. Descriptive statistics were expressed by means of mean and standard deviation. Shapiro Wilks test used to test the normality of the data set. Kruskal Wallis test was used to find the difference in mean Salivary pH between the groups and within the groups at Baseline, Immediate and after 15 min, 30 mins. A statistically significant difference in mean Salivary pH was observed between the groups at Immediate and after 30 mins (p<0.05). The mean Salivary pH was significantly dropped in Oreo, Dream cream and Hide & Seek groups at various time-periods. Based on the results of the present study, it can be concluded that maximum drop in mean salivary pH was observed in Group IV followed by Group II and Group I. It was observed that in all the groups, the pH gradually got back to near normal levels due to the buffering mechanism of saliva.

scholarly journals Completeness of the eutherian mammal fossil record and implications for reconstructing mammal evolution through the Cretaceous/Paleogene mass extinction

Paleobiology ◽  
2017 ◽  
Vol 43 (4) ◽  
pp. 521-536 ◽  
Author(s):  
Thomas W. Davies ◽  
Mark A. Bell ◽  
Anjali Goswami ◽  
Thomas J. D. Halliday
Keyword(s):  
Mass Extinction ◽  
Fossil Record ◽  
Information Criterion ◽  
Molecular Data ◽  
Tectonic Activity ◽  
Eutherian Mammal ◽  
Geological Time ◽  
Data Set ◽  
Significant Difference ◽  
The Difference

AbstractThere is a well-established discrepancy between paleontological and molecular data regarding the timing of the origin and diversification of placental mammals. Molecular estimates place interordinal diversification dates in the Cretaceous, while no unambiguous crown placental fossils have been found prior to the end-Cretaceous mass extinction. Here, the completeness of the eutherian fossil record through geological time is evaluated to assess the suggestion that a poor fossil record is largely responsible for the difference in estimates of placental origins. The completeness of fossil specimens was measured using the character completeness metric, which quantifies the completeness of fossil taxa as the percentage of phylogenetic characters available to be scored for any given taxon. Our data set comprised 33 published cladistic matrices representing 445 genera, of which 333 were coded at the species level.There was no significant difference in eutherian completeness across the Cretaceous/Paleogene (K/Pg) boundary. This suggests that the lack of placental mammal fossils in the Cretaceous is not due to a poor fossil record but more likely represents a genuine absence of placental mammals in the Cretaceous. This result supports the “explosive model” of early placental evolution, whereby placental mammals originated around the time of the K/Pg boundary and diversified soon after.No correlation was found between the completeness pattern observed in this study and those of previous completeness studies on birds and sauropodomorph dinosaurs, suggesting that different factors affect the preservation of these groups. No correlations were found with various isotope proxy measures, but Akaike information criterion analysis found that eutherian character completeness metric scores were best explained by models involving the marine-carbonate strontium-isotope ratios (87Sr/86Sr), suggesting that tectonic activity might play a role in controlling the completeness of the eutherian fossil record.

scholarly journals use of aspect in Czech L2

2003 ◽  
Vol 29 ◽  
pp. 177-194
Author(s):  
Barbara Schmiedtová
Keyword(s):  
English Learners ◽  
English Learner ◽  
Data Set ◽  
Lexical Meaning ◽  
Imperfective Aspect ◽  
Verbal Prefixes ◽  
Significant Difference ◽  
Verb Forms ◽  
The Difference ◽  
The Right

The focus of the present paper is on the difference between English and German learners‘ use of perfectivity and imperfectivity. The latter is expressed by means of suffixation (suffix -va-). In contrast, perfectivity is encoded either by suffixation (-nou-) or by prefixation (twenty different prefixes that mostly modify not only aspectual but also lexical properties of the verb). In the native Czech data set, there is no significant difference between the number of imperfectively and perfectively marked verb forms. In the English data, imperfectively and perfectively marked verb forms are equally represented as well. However, German learners use significantly more perfective forms than English learners and Czech natives. When encoding perfectivity in Czech, German learners prefer to use prefixes to suffixes. Overall, English learners in comparison to German learners encode more perfectives by means of suffixation than prefixation. These results suggest that German learners of Czech focus on prefixes expressing aspectual and lexical modification of the verb, while English learners rather pay attention to the aspectual opposition between perfective and imperfective. In a more abstract way, the German learner group focuses on the operations carried out on the left side from the verb stem while the English learner group concentrates on the operations performed on the right side qfrom the verb stem. This sensitivity can be to certain degree motivated by the linguistic devices of the corresponding source languages: English learners of Czech use imperfectives mainly because English has marked fully grammatical form for the expression of imperfective aspect – the progressive -ing form. German learners, on the other hand, pay in Czech more attention to the prefixes, which like in German modify the lexical meaning of the verb. In this manner, Czech prefixes used for perfectivization function similar to the German verbal prefixes (such as ab-, ver-) modifying Aktionsart.  

scholarly journals INFLUÊNCIA DO AMBIENTE NA ESTRUTURA DE TAMANHO E BIOMASSA DA Emerita brasiliensis (Schimitt, 1935) NA PRAIA BRAVA E GUARDA DO EMBAÚ

2020 ◽  
Vol 23 (1) ◽  
Author(s):  
José Xavier Da Silva Neto ◽  
Karoliny Do Nascimento Deucher ◽  
Aline Simplicio ◽  
Natalia Joana Rebello da Cunha ◽  
Tito Cesar Marques de Almeida
Keyword(s):  
Statistical Analysis ◽  
Statistical Data ◽  
Biological Indicators ◽  
Systematic Sampling ◽  
Santa Catarina ◽  
Important Species ◽  
Significant Difference ◽  
Before And After ◽  
The Difference ◽  
The Relationship

Emerita brasiliensis is an important species of Brazilian macrofauna, they are inhabitants of the intertidal areas, and have important components that enable their use as biological indicators environmental. Therefore, the objective was to analyze the relationship between population and size of individuals of Eremita brasiliensis, comparing two beaches on the coast of Santa Catarina, being Praia brava in Itajaí, with an increasing level of urbanization and Guarda do Embaú Beach in Paulo Lopes, which has a stationary degree. The collections took place in March and September 2016, with the sample area parallel to the sand and intertidal strips for a systematic sampling observing the estimated time for low tide. For collection, a 20cm diameter PVC cylinder was used and buried at a depth of 20cm. The samples were arranged in a 0.5mm opening mesh and sent to the laboratory, where the organisms of the genus Emerita brasiliensis were separated and identified for the measurement of biomorphometric data, observing the lateral diameter and rostro-caudal length of the carapace. The biomass weighing was performed before and after the drying procedure, performed in a controlled temperature oven at 37ºC for 48 hours. For statistical analysis, the ANOVA test was used. Based on the individuals collected, it is observed Guarda do Embaú beach with more individuals when compared to Brava Beach. Statistical data show a significant difference between the months and the beaches, which is justified by the state of conservation of Guarda do Embaú beach, which remains static due to its low urbanization. Therefore, it is concluded that the difference between Emerita Brasiliensis communities is due to changes in local dynamics, such as anthropic trampling and sediment change. The results were not accurate due to the low number of samples, but are significant and relevant for further research.

scholarly journals Spatial aspects of demographic processes in Serbia

Stanovnistvo ◽  
2018 ◽  
Vol 56 (2) ◽  
pp. 23-38
Author(s):  
Nikola Krunic ◽  
Aleksandra Gajic ◽  
Danijela Srnic ◽  
Dragutin Tosic
Keyword(s):  
Statistical Data ◽  
Population Distribution ◽  
Mutual Influence ◽  
Infrastructure Development ◽  
Methodological Framework ◽  
Demographic Development ◽  
Emergency Situations ◽  
Powerful Analytical Tool ◽  
Demographic Processes ◽  
New Research

Changes in the trends, distribution and structures of the population identified through censuses (such as the changes in total population, gender, educational, age and other structures) are crucial for understanding spatial phenomena and processes like urbanization. Numerous urban geography studies researching the development of systems of settlements in former Yugoslavia, which carried on in Serbia, were the foundation for a singular theoretical and methodological framework for researching spatial phenomena and processes focused precisely on the understanding of dynamic changes in the structures of the population and their territorial manifestation. Other than in scientific research, this approach found direct application in spatial and urban planning, when defining the measures directing demographic development, arrangement of urban functions, formation of a system of settlements, planning infrastructure development, etc. More recently, this theoretical and methodological framework was enhanced using GIS technologies, which allow for the integration of spatial and statistical data and provide for a powerful analytical tool. Data integration has spurred new research on the correlation between demographic and spatial phenomena and the mutual relationships and influences between spatial and demographic development. This paper presents an overview of existing research on the mutual influence between population development trends and spatial changes manifest through the fluctuations in the intensity of built-up areas, population density, infrastructure development, etc. A model of population distribution was created by using selected census statistical data and correlating them with phenomena in actual geospace. Emphasis is placed on the significance of using this and similar models in further research on the population?s impact on the environment, directing economic development, protection in emergency situations, and numerous other areas.

Difference Fourier Analysis of Glucose Embedded and Frozen Hydrated Purple Membrane

1982 ◽  
Vol 40 ◽  
pp. 74-75
Author(s):  
Jules S. Jaffe ◽  
Robert M. Glaeser
Keyword(s):  
Purple Membrane ◽  
Data Set ◽  
High Resolution Data ◽  
X Ray ◽  
X Ray Crystallography ◽  
Fourier Techniques ◽  
Versus Protein ◽  
The Difference ◽  
Difference Fourier ◽  
Ideal Method

Although difference Fourier techniques are standard in X-ray crystallography it has only been very recently that electron crystallographers have been able to take advantage of this method. We have combined a high resolution data set for frozen glucose embedded Purple Membrane (PM) with a data set collected from PM prepared in the frozen hydrated state in order to visualize any differences in structure due to the different methods of preparation. The increased contrast between protein-ice versus protein-glucose may prove to be an advantage of the frozen hydrated technique for visualizing those parts of bacteriorhodopsin that are embedded in glucose. In addition, surface groups of the protein may be disordered in glucose and ordered in the frozen state. The sensitivity of the difference Fourier technique to small changes in structure provides an ideal method for testing this hypothesis.

Convergence of regional population density in Russia over 120 years

2020 ◽  
pp. 133-158
Author(s):  
K. A. Kholodilin ◽  
Y. I. Yanzhimaeva
Keyword(s):  
Population Density ◽  
Spatial Dependence ◽  
Population Distribution ◽  
Regional Level ◽  
Capital City ◽  
County Level ◽  
Spatial Effects ◽  
Russian Regions ◽  
Regional Population ◽  
Regional Population Density

A relative uniformity of population distribution on the territory of the country is of importance from socio-economic and strategic perspectives. It is especially important in the case of Russia with its densely populated West and underpopulated East. This paper considers changes in population density in Russian regions, which occurred between 1897 and 2017. It explores whether there was convergence in population density and what factors influenced it. For this purpose, it uses the data both at county and regional levels, which are brought to common borders for comparability purposes. Further, the models of unconditional and conditional β-convergence are estimated, taking into account the spatial dependence. The paper concludes that the population density equalization took place in 1897-2017 at the county level and in 1926—1970 at the regional level. In addition, the population density increase is shown to be influenced not only by spatial effects, but also by political and geographical factors such as climate, number of GULAG camps, and the distance from the capital city.

Cranial crassicaudiasis in two coastal dolphin species from South Africa is predominantly a disease of immature individuals

2020 ◽  
Vol 139 ◽  
pp. 93-102 ◽  
Author(s):  
MF Van Bressem ◽  
P Duignan ◽  
JA Raga ◽  
K Van Waerebeek ◽  
N Fraijia-Fernández ◽  
...  
Keyword(s):  
South Africa ◽  
Bone Development ◽  
Bottlenose Dolphins ◽  
Fatal Outcome ◽  
Population Level ◽  
Cape Coast ◽  
Osteolytic Lesions ◽  
Immune Mediated ◽  
Significant Difference ◽  
The Difference

Crassicauda spp. (Nematoda) infest the cranial sinuses of several odontocetes, causing diagnostic trabecular osteolytic lesions. We examined skulls of 77 Indian Ocean humpback dolphins Sousa plumbea and 69 Indo-Pacific bottlenose dolphins Tursiops aduncus, caught in bather-protecting nets off KwaZulu-Natal (KZN) from 1970-2017, and skulls of 6 S. plumbea stranded along the southern Cape coast in South Africa from 1963-2002. Prevalence of cranial crassicaudiasis was evaluated according to sex and cranial maturity. Overall, prevalence in S. plumbea and T. aduncus taken off KZN was 13 and 31.9%, respectively. Parasitosis variably affected 1 or more cranial bones (frontal, pterygoid, maxillary and sphenoid). No significant difference was found by gender for either species, allowing sexes to be pooled. However, there was a significant difference in lesion prevalence by age, with immature T. aduncus 4.6 times more likely affected than adults, while for S. plumbea, the difference was 6.5-fold. As severe osteolytic lesions are unlikely to heal without trace, we propose that infection is more likely to have a fatal outcome for immature dolphins, possibly because of incomplete bone development, lower immune competence in clearing parasites or an over-exuberant inflammatory response in concert with parasitic enzymatic erosion. Cranial osteolysis was not observed in mature males (18 S. plumbea, 21 T. aduncus), suggesting potential cohort-linked immune-mediated resistance to infestation. Crassicauda spp. may play a role in the natural mortality of S. plumbea and T. aduncus, but the pathogenesis and population level impact remain unknown.

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