bluuebunny/crossref_metadata_2025 huggingface dataset:
Informant (Dis)Agreement on Ratings of Challenging Behaviors and Social Communication in Preschool Children With Autism Spectrum Disorder
Authors: Reetzke Rachel , Pfeiffer Danika , Kalb Luther G. , Holingue Calliope , Zetlmeisl Carrie , Hong Ji Su , Landa Rebecca
Published: May 2021

Purpose

Cross-informant ratings are considered best practice for assessing children with autism spectrum disorder (ASD). However, informant disagreement often occurs, which can pose significant challenges to various aspects of clinical services. This study explored the degree of parent and speech-language pathologist (SLP) agreement on ratings of challenging behaviors and social communication skills in preschool children with ASD.

Method

Fifty-eight informant ratings of challenging behaviors and social communication skills were collected from parents and SLPs on the same 29 preschool children with ASD (
M
= 49.93 months,
SD
= 11.67 months) using the Pervasive Developmental Disorder Behavior Inventory. Parent versus SLP group rating comparisons were assessed with paired
t
tests and Cohen's
d
effect sizes. Intraclass correlation coefficients were calculated to examine interrater reliability between individual parent and SLP ratings. Bland–Altman plots were generated to evaluate informant agreement across the entire range of Pervasive Developmental Disorder Behavior Inventory composite scores.

Results

Group comparisons indicated that parents rated arousal regulation problems as more severe than SLPs, with no other group differences observed. Parents and SLPs exhibited poor agreement on ratings of challenging behaviors; however, moderate to good agreement was observed for social communication ratings.

Conclusions

These results highlight the importance of including parents in the assessment and treatment planning process for preschool children with ASD, as parents may report key behavioral concerns that clinicians may not otherwise observe. Understanding behaviors that may be more prone to informant disagreement has implications for promoting a shared understanding of behavioral concerns and treatment targets between parents and clinicians.
SFCN: Symmetric feature comparison network for detecting ischemic stroke lesions on CT images
Authors: Zhang Long , Zhu Chuang , Wu YueWei , Yang Yang , Luo Yihao , Song Ruoning , Liu Lian , Yang Jie
Published: May 2021

Ischemic stroke is the most common stroke and the leading cause of
disability and death in the world. Computed tomography (CT) is a popular and
economical diagnostic device for the stroke, However the ischemic stroke
lesions are not evident on CT images and the diagnostic result relies on the
visual observation of neurologists, which may vary from doctor to doctor. To
facilitate the treatment, a computer‐aided detection algorithm on CT images is
proposed to help clinician for the ischemic stroke screening. In order to
obtain accurate lesion annotation on CT images, novel automatic algorithms are
developed to achieve image pairing, calibration, and registration. Then, a new
framework with the symmetric feature extraction and comparison is proposed to
identify and locate the ischemic stroke lesion. Experimental results show that
this method achieves 75% of DICE in the detection of ischemic stroke lesions,
which is higher than other methods by 4%. Its competitive results compared with
seven latest methods is shown in terms of extensive qualitative and
quantitative evaluation. This method can accurately detect the lesion in the CT
images through the comparison of symmetric regional features, which has
contributed to the clinical diagnosis of ischemic stroke.
Connection of water permeability with a number of physical properties of polymers
Authors: Askadskii A.A. , Zhdanova T.V. , Andreev I.F. , Matseevich S.V. , Matseevich T.A.
Published: May 2021

Currently, methods for predicting the properties of polymers are very popular, since they simplify the work of synthetic chemists. Instead of lengthy and time-consuming experiments, many properties of polymers can be predicted in advance based on their chemical structure. Naturally, such tasks must be computerized so that the properties are predicted after the chemical structure of the repeating polymer unit is displayed on the display screen. This is the so-called direct task. The inverse problem is more complex and interesting. It consists in entering the intervals of the desired characteristics into the computer. Then computer synthesis of polymers possessing these characteristics are realized. The work consists in writing a computer program that allows the computer synthesis of polymers of different classes with specified intervals of water permeability. These classes include polyurethanes, polysulfones, polysulfides, polyethers and polyesters, polyamides, polyketones and polyethyrketones, polycarbonates, polyolefins, vinyl polymers, polystyrene, acrylic and methacrylic polymers. On the basis of this program, water permeability compatibility diagrams are constructed with various physical characteristics of polymers – glass transition temperature, temperature of the onset of intensive thermal degradation, cohesion energy, density, solubility parameter (Hildebrand parameter).
Optimization of reinforced concrete structures: importance of design detail level
Authors: Tamrazyan Ashot , Alekseytsev Anatoly
Published: May 2021

The study of the influence for design solution detailing on the cost of reinforced concrete structures during their optimization is carried out. A hypothesis is formulated on the final improvement of the target criterion with an increase in the number of variable parameters. Depending on this number, the concepts of three levels of detail are introduced, at which optimization can be carried out, and the degree of risk of failure of the structure is indicated for them. Using the example of finding a constructive solution for a reinforced concrete beam by the cost minimization criterion, the relationship of the cost change is shown when the number of independently variable parameters changes. The normal operation of the beam and the emergency action effects in the form of local damage to a single corner connection are taken into account. Genetic algorithms are used for the optimization.
Correlation characteristics assessment of construction products reliability parameters
Authors: Chiganova Nadezhda
Published: May 2021

Since the reliability of construction products, by definition, is a probability of failure-free operation, then to assess the correlation characteristics between the parameters of the reliability of construction products that are not observed at the same time, we will use the designations and terms used in the theory of probability and mathematical statistics. Existing statistical methods for assessing the conditional mathematical expectation applied to the construction product reliability are based on the possibility of simultaneous measurement of the value of random variables. Because of this, they get a set of extreme points in the plane of those variables, and then build a regression line estimates based on those parameters. Such methods are obviously unacceptable for the case when the quantities the mentioned random variables are cumulatively unobserved. The solution to this problem will allow us to find estimates (not statistical) of the regression line and a number of other characteristics associated with it for simultaneously unobservable random variables. The algorithm described in the current work illustrates an example of interest in the theory of reliability for finding the extrema of the averaged function over the given initial parameters of the construction product.
Safety of Objects of the Urban Environment During Construction Work
Authors: Sinenko Sergey , Yakupova Julia , Satiadzhiev Hakim
Published: May 2021

At the present time, the share of work related to the reconstruction and compaction of urban development is growing strongly. In this regard, there is growing interest in ensuring the safety requirements of urban environment objects during construction and reconstruction of buildings and structures. It is necessary to make the most rational use of existing infrastructures, preserving the architectural appearance of the urban environment. A characteristic feature of the construction and installation work is the need to combine the production of work and the operation of urban development facilities (residential, public, industrial buildings, as well as highways and footpaths). From the rationality of the choice of solutions to ensure the safety of these facilities, the expected effect of the reconstruction of urban development The limitation in this case is the need to ensure safe operating conditions for the objects of the urban environment. Therefore, the safety measures used in the production of construction and installation works must satisfy not only and not so much the requirements of labor protection, but also the requirements of environmental protection, the subject of which, in contrast to labor protection, is unskilled and unskilled and unprepared people. The purpose of this study is to develop an algorithm for accounting for labor safety in the construction industry and a system of protective equipment. The proposed system of means of protecting objects allows for the construction and reconstruction of buildings and structures during the consolidation or reconstruction of urban development. The choice of a rational complex of means and the order of their use in each specific case is determined depending on the characteristics of individual situations "the source of danger is a protected object of the urban environment" and their totality within the object. Organizational and technological solutions contained in the catalog allow solving this problem.
Determination of subsidence of base with intensive soaking of subsidence soil
Authors: Yarkin Viktor , Lobacheva Nataliia
Published: May 2021

The article considers study of influence of coefficient ksl on subsidence value. In course of study, it was revealed that coefficient ksl, determined according to normative documents of Russian Federation, has a limited scope and does not always lead to sufficiently satisfactory and theoretically justified results. In this article, a range of pressures on the bases up to 500 kPa has been investigated. This range makes it possible to take into account the redistribution of pressures in case of uneven deformations of the base of the foundations. These pressures in some areas can significantly exceed calculated resistance of subsidence soil. When pressure increases more than 500-600 kPa, subsidence decreases due to additional compaction of subsidence soil without soaking due to destruction of structural bonds from pressure value. Therefore, at high pressures on the base, proportion of subsidence deformations in the total vertical deformation decreases and the proportion of deformations caused by the development of shear zones increases. Dependence of thickness of lower subsidence zone on pressure by at different widths of bottom of a foundation are presented. Proposed algorithm for determining subsidence deformation by external load on base, allows to separate subsidence deformation from shear deformation of soil and thus obtain more accurate values of subsidence deformations in entire range of possible pressures on foundation Dependences of subsidence on pressure determined by normative documents and proposed algorithm for different foundation widths are given. A comparative analysis of values of subsidence at different foundation widths is given.
Selection of the optimal value of compressive stress in concrete under adverse external impacts
Authors: Goncharov Anatoliy
Published: May 2021

This article reviews the effect of static and dynamic compressive stresses on the durability of reinforced concrete structures in aggressive environments. Based on the analysis of previous work and research on this issue, the author describes the main activities to be implemented in the course of works to ensure the durability of concrete and safety of reinforcement. He outlines the necessary measures to reduce the magnitude of dynamic stresses in pile driving and to ensure the healing of microdamage incurred therein. It is proved in the article that the implementation of the proposed set of measures will allow using reinforced concrete piles as supporting structures of quays in harsh climatic conditions.
Labor costs management in the large-block construction of NPP
Authors: Morozenko Andrey , Shashkov Alexey
Published: May 2021

The article continues the research of the features of the use of prefabricated cast-in-place structures in the construction of nuclear power plants (NPP), the organizational and economic feasibility of the use of prefabricated cast-in-place structures in the implementation of new projects for the construction of nuclear power plants. The estimation of labor costs and resource costs of installation of large-block structures for the reactor building of the NPP was made. The dependence of labor costs for the installation of reinforced blocks, depending on the share of using reinforced blocks during the construction of the reactor building of a nuclear power plant, was obtained. The dependence of the overall labor costs for the industrial production and installation of reinforced blocks, depending on the share of using reinforced blocks during the construction of the reactor building of a nuclear power plant, was obtained. Graphical representations of dependencies are illustrated. The main daily resource consumption for the installation of reinforced blocks during large-block construction has been analytically calculated. The data on the required shares of labor costs at industrial enterprises and at the construction site in percentage terms were obtained. The conclusion is made about the rational use of large-block construction in the implementation of NPP construction projects.
The beginning of the movement of bottom sediments in an unsteady flow
Authors: Eshev Sobir , Gaimnazarov Isroil , Latipov Shakhboz , Mamatov Nurbek , Sobirov Feruz , Rayimova Iroda
Published: May 2021

This article discusses the problems of determining the friction parameter and non-eroding conditions in a wave flow are considered from the standpoint of an approach using a critical dynamic speed. In the first stage of research, the question of the formation of an unsteady turbulent boundary layer is substantiated. Because of the research, dependences were obtained for the most important value from the point of view of sediment transport - the friction parameter. Based on the data of these measurements, a plot of dependence was built, which differs from the previously obtained analytical relationships. For the convenience of practical use of the obtained empirical connection approximated.

The second stage of research is the development of a method for calculating the critical tangential stresses corresponding to the beginning of the movement of bottom sediments. Based on the Shilds method, a curve similar to the Shilds curve for wave flow conditions was constructed, which was approximated for the convenience of practical use.
Metal intensity of structural roof slab under different supporting conditions
Authors: Vasilkin Andrey , Zhaparalieva Gulnaz.
Published: May 2021

The article presents and solves the problem of finding the design of minimum weight structural slab roof for given steel class, element cross-section type, and loading conditions. Structural roof slabs are widely used for large-span public and industrial buildings and allow a wide variety of structural and architectural forms. At the same time, the placement of supports was changed. In total, 10 options for the supports placement for the 36×36 m structural slab and 6 options for the topology were considered. After applying the load, structure’s strain-stress distribution was determined numerically, a cross-section was selected and its weight was calculated. Then, different options of support were compared in terms of structure weight. In fact, the article solved optimization problem by optimality criterion of metal intensity, restrictions in the form of overall dimensions, topology and strength conditions.
Seismic resistance estimation of multi-story steel frames under ductility level earthquake impact by nonlinear static method
Authors: Zubritskiy Maksim , Ushakov Oleg , Sabitov Linar , Nabiullina Karina
Published: May 2021

The article proposes a technique for taking into account the higher vibration modes under seismic resistance estimation of multi-story steel frames by nonlinear static method. The characteristic point search has also been improved. As part of the study, the proposed method was verified by time history analysis. Proposed technique allows one to significantly reduce the calculation time, while excluding the deficit of seismic resistance.
Parsing with graph convolutional networks and clustering
Authors: Sak Alexander
Published: May 2021

When designing machine translation systems, an important task is to represent data using graphs, where words act as vertices, and relations between words in a sentence act as edges. One of these tasks at the first stage of the analysis is the classification of words as parts of speech, and at the next stage of the analysis is to determine the belonging of words to the sentence members’ classes. A robust approach to carry out such a classification is to determine words embeddings by using Graph Convolutional Networks at the beginning of the analysis and then to apply k-means clustering which is an algorithm that splits objects (words) into groups. To determine weights an ordinary network is applied to obtained hidden layers in order to use these weights in subsequent analysis.
Boundary conditions for the problem of moisture transport in concrete
Authors: Ter-Martirosyan Zaven , Bakhmisov Viktor
Published: May 2021

When calculating of the moisture transport in concrete of such geotechnical structures as a pile or diaphragm wall, contact with soil is forming the special boundary conditions. If the soil is in the full saturated state, then the Darcy’s law should be used to solve the problem, the boundary condition for which is the water pressure. Otherwise, the Bažant- Najjar model is used, for which the boundary condition is the relative humidity of soil environment at a certain temperature. The soil environment temperature is unique characteristic for each construction area. For Moscow region, the weighted arithmetic mean temperature to the depth of 60 m is 7.3°C. It is proposed to calculate the relative humidity of the soil environment according to the Kelvin capillary condensation equation, in which the suction is calculated using the Mualem-van Genuchten hydraulic model from the degree of saturation. Two well- known sets of hydraulic parameters of the Mualem-van Genuchten model, compiled on the HYPRES and the HYDRUS-1D database from the European soil map texture classes and the USDA textural soil classification respectively, were compared with the measurement results for soil samples classified according to Russian the GOST 25100. The experimental data showed a good approximation to the calculation with a set of parameters obtained on the basis of the HYPRES database. At the same time, the solution with the HYDRUS-1D parameter set showed a poor correlation.
Additional heat loss of jamb in enclosing structures
Authors: Samsonova Maria , Semenova Elvira , Kotova Christina , Salogub Leonid
Published: May 2021

One of the urgent problems today is to increase the energy efficiency of civil buildings. There is a need at the design stage to choose structures and design solutions that will compensate for the increasing consumption of energy resources in civil engineering. This article compares different building envelopes used in the construction of residential buildings: a volumetric block and a wall made of aerated concrete blocks. To determine the most energy efficient design solution construction is compared in different climatic regions. One of the most vulnerable places of a wall, from the point of view of energy efficiency, is a window jamb. In this article, an analysis is carried out to determine the construction with the lowest heat loss window jambs. Using the ELCUT software temperature fields and additional heat flux densities are calculated. According to the calculation, the proportion of heat loss due to window slope from heat loss according to the surface of the structure was determined. The heat flux density of the homogeneous section of the wall of the volume block is 1.28 times higher on average than in the aerated concrete wall. Regardless of the climatic conditions, the junction of the window jamb in buildings made of insulated panels of volumetric blocks is more energy efficient than the same junction in a building with aerated concrete walls.
Air temperature stratification when flowing between rooms
Authors: Sargsyan Samvel , Tsap Anna
Published: May 2021

The article presents the regularities of the vertical change in the air temperature of a ventilated room for various purposes, where the excess of sensible heat dominates, in the first case, when there is no process of air flow through the opening in a common vertical fence between the rooms located in a row, or the second case, when a similar air flow is observed. In heat-stressed rooms, the general ventilation arrangement scheme provides for the removal of air from the upper volume of the room. To determine the required air exchange with point, two-zone or multi-zone mathematical models of a ventilated room, it is necessary to have a reliable apparatus for determining the gradient of the vertical air parameters change for a ventilated room. The reasonably determined value of the gradient of the air temperature change along the vertical of the ventilated room makes it possible to calculate the air flow between different volumes inside the ventilated room. Determination of the air temperature near the suction flare makes it possible to determine the required air exchange more reasonably. A method is given for calculating the distribution of air temperature in rooms with an excess of apparent heat over the height of the room in the first case, when there is no process of air flow through the opening in the common vertical fence between the rooms located in a row, or the second case, when a similar air flow is observed. This takes into account the height of the supply air distributors relative to the working (serviced) area. Reasonable determination of the air temperature at different points in the room with an excess of sensible heat allows a correct calculation of the required air exchange. The presented method for determining the gradient of air temperature stratification along the height of the room with air flow between adjacent rooms and without it contributes to the reasonable determination of the air temperature at the suction flame of the exhaust air distributor, which increases the reliability of calculating the required air exchange.
Comparison of methods for calculating biological wastewater treatment
Authors: Gogina Elena , Ogneva Olga
Published: May 2021

Due to the increase in the discharge of nitrogen and phosphorus compounds into water bodies in many countries, the problem of eutrophication has become the most relevant in the field of biological treatment technologies. To solve this problem, many technological schemes for purification from biogenic elements have been developed, based on different methods. The concept of biological purification, the composition and process of nutrition of heterotrophic microorganisms, as well as the course of the process of methanogenesis are analyzed. The analysis of the methods of the two countries, Russia and Germany. Most of the facilities in Russia are designed in accordance with SNiP 2.04.03.85, while Germany offers a different biological treatment method developed by the German Water Association DWA A131.
Assessment of the manufacturability of construction products in the renovation zone
Authors: Oleinik Pavel
Published: May 2021

Nowadays, the large-scale development of the renovation of the housing stock of cities includes not only the reconstruction of residential areas, but also the actively expanding renovation of industrial zones. Moreover, each renovation area is characterized by a wide variety of residential and non-residential buildings, urban infrastructure facilities. According to the structure of renovation objects, eight main zones have been identified, which include various combinations of the above objects. At the same time, in the process of work, it is necessary to constantly monitor the compliance of technology regulations with the design values of the quality of construction products. For this, in order to assess both individual groups of objects and buildings and structures for the renovation zone in general, a system of manufacturability indicators is proposed. As a basic indicator, labor costs (machine time) are recommended, since it is the changes in the technology of work that immediately affect the work of construction teams and their links. The conditions are given under which it is possible to assert the compliance or non-compliance of the applied technological regulations with the design requirements. The sequence of establishing an integral indicator of the manufacturability of construction products during the period of their creation in the whole renovation zone is described.
Justification of modernization of groundwater treatment station
Authors: Govorova Zhanna , Zubareva Olga , Semenovykh Vasiliy , Muraveva Ekaterina , Yankovskaya Olga
Published: May 2021

The main contaminants of groundwater are iron and manganese compounds, increased hardness, which are removed at groundwater conditioning stations. The article reviews the existing station that was built according to a conventional design and uses the method of simplified aeration with the following filtration through high-silica sand. Assessment of the technical condition of the station showed that the elements of the building are limited to work The filters are in poor condition, some of the filters are out of service, there are concrete corrosion, destruction of finishing layers in filters’ building, internal and external corrosion of metallic pipelines and valves, which depend on he quality of transported water. Wear of the technological pipelines is over 80%. Analysis of the efficiency of the station showed that it operates at 50% capacity and at the same time does not provide standards for the hardness of drinking water. Water consumption for the station’s own needs is 1.5 times higher than it was designed. There are no processing and reusing facilities for flushing water. Results of the technical and technological inspection of the station showed that there is a need for immediate modernization of the station including the improvement of the groundwater purification technology and bringing he quality to the standards for drinking water.
Regulations on PPP contracts in Vietnam: Status Quos and Solutions
Authors: Quoc Toan Nguyen , Dinh Phong Nguyen , Viet Huong Nguyen , Thi Tuyet Dung Nguyen , Tan Nguyen
Published: May 2021

PPP investments have been in practice in Vietnam for more than 20 years, yet, many shortcomings and constraints have been revealed. This paper analyzes applicable legal regulations on Public-private partnership contracts of investment in Vietnam, and demonstrates barriers encountered by parties, particularly private sector, including discrepancies and non-coherence among legal documents resulting in losses, wastes of resources; absence of standard agreements/ contracts making negotiations and contract signing hard to conclude; insufficient clarity in provisions about concessioning, and responsibilities, among others. The analysis, hence, suggests how to deal with the situation by amendments, supplements to provisions on the agreements between public and private partners.
Risk management in construction sphere
Authors: Kaverzina Liudmila , Litvin Elena , Dorofeeva Victoria , Nikiforova Valentina
Published: May 2021

In modern terms of housekeeping complicated by coronavirus infection and crisis phenomena in world and Russian economics, there is a high probability of different risks occurrence, connected with activity of modern enterprises in investment and construction sphere. Success, profit and efficiency of enterprise activity in current situation in many ways depends on ability to manage appearing risks to minimize them. It confirms relevance of the research which results are performed in this article. Purpose of the research is to reveal priority directions of management actions aimed to production, financial, logistics, investment and other processes functioning in regional investment and construction sphere, and also to develop mechanism of risk management, which allows to provide reducing of risk appearance probability and minimize their effects. Authors have assessed state Irkutsk region’s investment and construction complex, determined the most likely risks of construction activity. It has been determined the essence of “risk” concept, and systematization of risks in investment and construction processes has been implemented. Mechanism of construction enterprise’s risk management has been developed. The methodological base for research are general scientific methods of understanding the processes of construction products: observation, generalization, comparison, grouping, as well as methods of logical, economical and system analysis.
Contribution of individual behavioural change on household carbon footprint
Authors: Marchi Lia , Vodola Vincenzo , Visconti Cristina , Gaspari Jacopo , Antonini Ernesto
Published: May 2021

Many actions have been undertaken worldwide to cope with climate change and to effectively reach the 2030 Agenda for Sustainable Development. Top-down approaches, based on both policies for the development of enabling technologies and incentives to promote their wide applications, have been largely adopted in most of the cases. However, the potential contribution of changes in individual behaviours still represents an underestimated field of improvement, despite many scholars have already evidenced their considerable expected impacts. This paper presents the first outcomes of a study on the role of citizens’ behavioural change in reducing GHG emissions, focussing on the functions and performed activities at household level. Starting from a review of the emerging body of literature on the topic, a map is drafted linking the people’s actions and choices and their most relevant effects on each of the environmental categories they can interact with. The mapping provides a list of suitable practices and lifestyles shifts to be adopted, organized by categories and weighted by their emission potential reduction on the whole households’ carbon footprint. This results in a sort of easy-to-read console allowing citizens to operate according to more informed decisions within their homes, thus accelerating the sustainable transition by bottom-up initiatives.
Localization as a paradigm of urban development
Authors: Iudina Natalia
Published: May 2021

Today globalisation appears to evoke a set of problems, including spatial inequality and the necessity arises to elaborate an alternative paradigm. There are already known plenty of location theories, among which industrial regions or clusters appeal to local relations rather than global economic system. Being a perspective model of urban development, it is still hardly embodied in urban planning to solve regional problems efficiently. The article intends to contribute to the theory of clusters and adapt it to socio-economic principles which identify the existence of towns. The case of small towns and settlements illustrates how local potentials can be used for sustainable urban development.
Analysis of building information modeling technologies for transport infrastructure objects at the stages of the life cycle
Authors: Zheleznov Maksim , Adamtsevich Liubov , Vorobiev Pavel , Rybakova Angelina
Published: May 2021

The expansion of the transport system is one of the urgent tasks of the development of the Russian economy. The high level of transport infrastructure quality ensures the development of many areas of business, simplifies the procedure for transporting goods, and also creates comfortable conditions for the movement of passengers. For the progression of the transport system, it is necessary to regularly increase the number of objects, which in turn forms an increase in the volume of transport construction. The current design and construction approaches do not provide a sufficient level of fast and high-quality construction of facilities, therefore, the introduction of modern work methods is an urgent issue. Information modeling technologies are currently one of the promising areas of digitalization, but in the field of transport construction they have not yet received sufficient application. The purpose of this research work is to analyze the use of information modeling technologies for transport infrastructure objects at all stages of the life cycle, and the task is to determine the processes for implementation through the information modeling functionality. The paper outlines the main features of transport infrastructure facilities, the specifics of work based on information modeling, and also analyzes their integration throughout the entire life cycle. As a result, an analysis of the effectiveness of the use of information modeling technology tools for the main tasks of each stage of the life cycle is presented, and an information transfer algorithm is formed.
Investment and Construction Projects Management by Monitoring the Ecological State of Urban Space
Authors: Orlov Alexandr , Chubarkina Irina
Published: May 2021

The authors carried out the analysis of the current state of the Russian investment and construction market, theory and practice of project analysis, which made it possible to determine the specifics of housing construction projects development during the crisis and highly uncertain external and internal factors of its implementation. Urban agglomerations development is a continuous process of transformation of the existing urban environment, where daily living activities are carried out, connected with changing social requirements. It includes various components of the integrated organization of the city’s space: ecological, functional, architectural and artistic, socio-cultural aspects, as well as the organization of population activities. At the same time, taking into account the peculiarities of the city as a whole, urban development, in particular, is today the dominant task in urban planning practice. The mechanism of indicative risk assessment was used to develop the author’s matrix for the processing of specific project risks during the crisis. Values of factor risk premiums are based on it, and they are taken into account when calculating the project efficiency. The use of this methodology makes it possible to identify and assess project risks with minimum resources, correct the parameters of the project’s commercial efficiency and, taking into account the results obtained, draw a conclusion about the feasibility of further project implementation. One should choose a certain classification of environmental risks focusing on the goals and objectives of projects. This allows choosing the right methodology for assessing environmental risks at the stage of information collection and analysis, which in the future will make it possible to make the most complete and balanced decision. The use of the proposed recommendations makes it possible to take into account the impact of commercial, financial, legal, production and management risks during the crisis and, as a result, more accurately calculate the commercial efficiency of a development project.
Evaluate quality of urban life
Authors: Vlasov Denis , Majorzadehzahiri Alireza , Amin Mohammad Sediq
Published: May 2021

Quality of life is one of the most important issues that has received special attention of researchers in urban planning studies today. Quality of life, while having objective dimensions and dependence on objective and mental conditions, and ultimately depends on one's perceptions and perceptions of the realities of life. Today, quality of life is the main goal of all planning produced by researchers and planners. Problems such as weak income sources, lack of public and private transportation, lack of suitable job opportunities and positions, medical centers, inadequate housing, problems and injuries caused by social inequalities, inadequate nutrition, and unsustainable housing, our urban neighborhoods Have faced challenges. The main purpose of this study is to investigate indicators related to quality of life from the perspective of citizens in Lashgar neighborhood of Tehran. The descriptive-analytical research method is based on the use of a questionnaire and in order to analyze the studied components, SPSS software and statistical methods such as mean responses, parametric t-test has been used. The results show that the quality of life in Lashgar neighborhood in environmental, economic, social, and transportation indicators in the city is not favorable from the perspective of neighborhood residents and the quality of life is low.
Dealing with heritage Hanoi Old Quarter
Authors: Ngo Thi Kim Dung
Published: May 2021

Properly solving the relationship between conservation and devel-opment is one of the important requirements in the development of historic urban. The author approaches the issue through case studies of the old Quarter, a special historical sites of Hanoi capi-tal. The process of urbanization and urban development has af-fected and made Hanoi Old Quarter (HOQ) many changes. How to maintain HOQ has been studied by many scientists. Some of the results of those studies have been applied in practice. Howev-er, the results are still moderate. This study focuses on compre-hensive review of the features of HOQ and its transformation in both tangible and intangible aspects. The author used the field survey method and secondary data for research. The results of the study have shown the characteristics of HOQ along with its changes in the aspects of economy, culture, society, science-technology and architecture-planning. The current status of HOQ is: Population density is too high; altered traditional functions; space, architecture and landscape are deformed and its characteristic elements are gradually lost; polluted environment, technical infrastructure are overloaded. The article al-so discusses the direction to maintain and develop HOQ as a his-torical sites without hindering the development of smart and sus-tainable urban development..
Ecology of Moscow urban agglomeration: problems and the ways of solving
Authors: Mezentzev Sergey
Published: May 2021

The present paper approaches the current ecological issues of Moscow urban agglomeration, including Moscow, the capital city of Russia, and Moscow region as well as the ways in which these issues could be solved. In the course of research, there have been used system and complex approaches, the methods of analysis, synthesis, abstraction, generalization, mental simulation, the methods of observation, comparison, statistical methods, and visualization. It was noted that the significant concentration of population in Moscow urban agglomeration leads to the population overflow and acute ecological problems on the given territory. Currently, ecological system of Moscow urban agglomeration represents the collective of interrelated and interconnected natural, anthropogenic and techno genic components. Techno genic and anthropogenic causes of environmental pollution, such as urban planning, industrial enterprises, power plants, transport, communication systems, domestic rubbish and wastes, have been studied in details. Also, there was given comparison of ecological situation of Moscow urban agglomeration, from one side, and the Netherlands, the Tula and Kursk regions of Russia, from the other side. Then, the transition to the search of new way of solving of ecological problems is done. As the most effective methods of ecological problem solving and reducing anthropogenic impact on environment, there were proposed: the lowering of migration flows into Moscow urban agglomeration, the use of renewable energy sources, non-waste technologies, construction of rubbish recycling plants and treatment facilities, liquidation of unauthorized disposal fields, substitution of the combustion engine transport by the transport with electrical engines.
Identification of the level of innovativeness of a complex major construction project
Authors: Politi Violetta
Published: May 2021

The complexity of a project as a system is characterized by the variety of elements and the number of possible initial and future states. It is possible to give an accurate mathematical description of a complex system based on the study of entropy. The entropy of states is defined as a measure of the diversity of the set of possible options. A construction project that includes a large number of heterogeneous innovative components belongs to the group of complex projects. The problem of control is to reduce its diversity by reducing the set of all states to a subset of states that satisfy the goals of control. Consequently, the essential characteristics of the innovativeness of a construction project should be studied in relation to the sphere of occurrence of the effect from the application of innovations. It seems logical to consider the effects of the introduction of innovations throughout the life cycle of an investment and construction project, which can be presented as an integral production and economic system.
Investigating emergent macrophytes establishment rate and propagation towards constructed wetlands efficacy optimization
Authors: Manolaki Paraskevi , Olesen Annica , Graves Hvidt Bjørg , Lauridsen Torben L. , Riis Tenna
Published: May 2021

Constructed wetlands have become a widely used tool for reducing nutrient loading from agriculture drainage water running to aquatic ecosystems. To ensure a high nutrient removal efficiency, it is often suggested to use macrophytes to retain or remove nutrients via uptake and through the denitrifying biofilm. In Europe, Phragmites australis and Typha spp are the most commonly used aquatic plants in constructed wetlands (CWs) with free surface flow, and these species often form monocultures in the wetlands. In order to achieve a more diverse vegetation, there is a need to introduce more plant species. Creating a mass production of plant material reduces both handling time and the risk of depleting and disturbing vegetation in natural habitats such as streams or lakes. However, a successful and continuous production of such material during growing seasons requires knowledge of the selected species' establishment and propagation. We examined the relative growth rate (RGR) of six emergent macrophyte species collected from streams and small lakes located in Mid Jutland (Denmark), in seasonal experiments from March to October in order to determine the most efficient time period for their propagation. We found that all species had highest RGR in June, and that several species showed high growth efficiency from April to August. The results showed that it is possible to have a full production of emergent macrophytes throughout the growing season, and therefore, we suggest to propagate plants for use in constructed wetlands in order to enhance biodiversity and ecosystem functioning.
Application of the geometric morphometrics approach in the discrimination of morphological traits between brown trout lineages in the Danube Basin of Croatia
Authors: Špelić Ivan , Rezić Andrea , Kanjuh Tamara , Marić Ana , Maguire Ivana , Simonović Predrag , Radočaj Tena , Piria Marina
Published: May 2021

Brown trout is a salmonid fish with a natural range extending throughout western Eurasia and North Africa. Due to its commercial value, it has also been introduced worldwide. In continental Croatia, introduced trout of the Atlantic lineage hybridizes with native trout of the Danubian lineage, threatening the native genetic diversity. The geometric morphometrics approach was used in this study to analyse changes in shape between native trout, introduced trout and their hybrids, classifieda prioriby molecular phylogenetic analyses. A total of 19 landmarks and semi-landmarks were used to capture the shape of 92 trout individuals belonging to two lineages and their hybrids. Canonical variate analysis and discriminant function analysis were used to analyse and describe shape variation. A significant difference was found between the shape of the Atlantic lineage trout and both Danubian lineage trout and hybrids, with the most prominent differences in body depth, head length and eye size. No statistically significant shape differences were observed between Danubian lineage trout and the hybrids. The observed significant differences in shape could be the result of genetic diversity or trout phenotypic plasticity. Further studies are needed to clarify the origin of this variation in shape.
Design and experimental study of electrical and mechanical brake for mine hoist
Authors: Jin Huawei , Huo Huanyu , Wang Chuanli , Wang Shun , Xu Huwei
Published: May 2021

To meet the requirement of the braking response of the coal mine hoist, a new electromechanical braking technology for mine hoists is proposed, the principle of electromechanical braking of mine hoists is demonstrated, and the detailed parameters and braking performance of electromechanical brakes are given. Index, an electromechanical brake test platform with large load and high response is developed. Experiments show that the maximum positive pressure of the designed electromechanical brake reaches 33 KN, which meets the requirement of positive pressure of mine hoist. The braking error is less than 10 %, and the braking gap elimination time is less than 0.1 s. There is a linear relationship between motor current input and brake positive pressure output, with a slope of 4.17 and an intercept of 0.62. The screw displacement output and the brake pressure output have a cubic relationship, and the zero error is small. Through research, a new idea is provided for the development of electromechanical brakes for coal mine hoist.
Dynamics of on-board rotors on finite-length journal bearings subject to multi-axial and multi-frequency excitations: numerical and experimental investigations
Authors: Briend Yvon , Chatelet Eric , Dufour Régis , Andrianoely Marie-Ange , Legrand Franck , Baudin Sophie
Published: May 2021

On-board rotating machinery subject to multi-axial excitations is encountered in a wide variety of high-technology applications. Such excitations combined with mass unbalance forces play a considerable role in their integrity because they can cause parametric instability and rotor–stator interactions. Consequently, predicting the rotordynamics of such machines is crucial to avoid triggering undesirable phenomena or at least limiting their impacts. In this context, the present paper proposes an experimental validation of a numerical model of a rotor-shaft-hydrodynamic bearings system mounted on a moving base. The model is based on a finite element approach with Timoshenko beam elements having six degrees of freedom (DOF) per node to account for the bending, torsion and axial motions. Classical 2D rectangular finite elements are also employed to obtain the pressure field acting inside the hydrodynamic bearing. The finite element formulation is based on a variational inequality approach leading to the Reynolds boundary conditions. The experimental validation of the model is carried out with a rotor test rig, designed, built, instrumented and mounted on a 6-DOF hydraulic shaker. The rotor’s dynamic behavior in bending, torsion and axial motions is assessed with base motions consisting of mono- and multi-axial translations and rotations with harmonic, random and chirp sine profiles. The comparison of the predicted and measured results achieved in terms of shaft orbits, full spectrums, transient history responses and power spectral densities is very satisfactory, permitting the experimental validation of the model proposed.