bluuebunny/crossref_metadata_2025 huggingface dataset:
Aptamer-based rolling circle amplification coupled with graphene oxide-based fluorescence resonance energy transfer for sensitive detection of cardiac troponin I
Authors: Li Yu , Dai Weiqiang , Lv Xuefei , Deng Yulin
Published: March 2018

Combining the high affinity and specificity of an aptamer for a protein, a highly sensitive strategy for protein detection was developed based on rolling circle amplification (RCA) and graphene oxide based fluorescence resonance energy transfer (FRET).
The chemical structure and anti-aging bioactivity of an acid polysaccharide obtained fromrosebuds
Authors: Tang Yun , Zhu Zhen-Yuan , Liu Yao , Sun Huiqing , Song Qiao-Ying , Zhang Yongmin
Published: March 2018

An acid polysaccharide, named R-PL, was extracted fromrosebuds by hot water (80 °C) extraction and purified by Sephadex G-200.
Y1 receptor ligand-based nanomicelle as a novel nanoprobe for glioma-targeted imaging and therapy
Authors: Li Juan , Du Yang , Jiang Zhenqi , Tian Yuchen , Qiu Nianxiang , Wang Yinjie , lqbal Muhammad Zubair , Hu Menying , Zou Ruifen , Luo Lijia , Du Shiyu , Tian Jie , Wu Aiguo
Published: March 2018

Y1 receptor ligand AP-NPY facilitates circumvention of the blood brain barrier by nanomicelles specifically targeting glioma, improving therapeutic efficacy and prolonging survival.
Nanoparticle–cell interactions induced apoptosis: a case study with nanoconjugated epidermal growth factor
Authors: Khanehzar Ali , Fraire Juan C. , Xi Min , Feizpour Amin , Xu Fangda , Wu Linxi , Coronado Eduardo A. , Reinhard Björn M.
Published: March 2018

In addition to the intrinsic toxicity associated with the chemical composition of nanoparticles (NP) and their ligands, inert biofunctionalized NP can perturb cellular processes and induce apoptosis.
Novel phenylpropanoid–amino acid adducts fromLigusticum chuanxiong
Authors: Zhang Xu , Han Bing , Feng Zi-Ming , Yang Ya-Nan , Jiang Jian-Shuang , Zhang Pei-Cheng
Published: March 2018

Eight new amino acid derivatives (1–8) and two known compounds (9–10) were isolated from the rhizome ofLigusticum chuanxiongHort.
Mechanistic insights into the different chemoselectivities of Rh2(ii)-catalyzed ring expansion of cyclobutanol-substituted aryl azides and C–H bond amination of cyclopentanol-substituted aryl azides: a DFT study
Authors: Gao Dafang , Bao Xiaoguang
Published: March 2018

The mechanism of Rh2(ii)-catalyzed ring expansion of ortho-cyclobutanol-substituted aryl azides to access N-heterocycles was investigated by DFT calculations.
Surface modification effects on the tensile properties of functionalised graphene oxide epoxy films
Authors: Matsuura Koji , Umahara Yuki , Gotoh Kazuma , Hoshijima Yuko , Ishida Hiroyuki
Published: March 2018

In order to determine the molecular interaction to improve the mechanical properties of graphene oxide (GO)–epoxy resin composites, we investigated the relationship between GO oxidation properties and the tensile strength of the epoxy resin.
Pyridazine-bridged cationic diiridium complexes as potential dual-mode bioimaging probes
Authors: Daniels Ruth E. , McKenzie Luke K. , Shewring Jonathan R. , Weinstein Julia A. , Kozhevnikov Valery N. , Bryant Helen E.
Published: March 2018

A novel cell permeable, mitochondria localising, diiridium complex has a high emission yield and two heavy atoms to increase scattering of electrons, supporting potential future applications as a dual fluorescence and electron microscopy probe.
Revealing the in situ NaF generation balance for user-friendly controlled synthesis of sub-10 nm monodisperse low-level Gd3+-doped β-NaYbF4:Er
Authors: Shen Ji-Wei , Wang Zhiqing , Wei Xiaoxuan , Liu Jiawei , Wei Yinmao
Published: March 2018

User-friendly solvothermal controlled synthesis of sub-10 nm monodisperse low-level Gd3+-doped β-NaYbF4:Er was achieved via revealing and balancing the competing in situ NaF generation reaction.
Hollow polymer microcapsule embedded transparent and heat-insulating film
Authors: Kim Chae Bin , You Nam-Ho , Goh Munju
Published: March 2018

Highly transparent, heat-insulating films were manufactured by incorporating hollow poly(methyl methacrylate) microcapsules into a transparent polymeric film.
Creating tissue on chip constructs in microtitre plates for drug discovery
Authors: Macdonald N. P. , Menachery A. , Reboud J. , Cooper J. M.
Published: March 2018

We report upon a novel coplanar dielectrophoresis (DEP) based cell patterning system for generating transferrable hepatic cell constructs, resembling a liver-lobule, in culture.
Accelerated fabrication of antibacterial and osteoinductive electrospun fibrous scaffolds via electrochemical deposition
Authors: Wang Yingbo , Gao Ya , Xu Guoqiang , Liu Han , Xiang Yi , Cui Wenguo
Published: March 2018

Fabricating quickly biomineralized nanofibers by combining electrospinning and electrodeposition for orthopedic applications.
Mechanistic understanding of salt-assisted autocatalytic hydrolysis of cellulose
Authors: Jiang Zhicheng , Fan Jiajun , Budarin Vitaliy L. , Macquarrie Duncan J. , Gao Yang , Li Tianzong , Hu Changwei , Clark James H.
Published: March 2018

NaCl enhanced the generation of acidic products from cellulose decomposition and pushed the generated protons to the surface of cellulose.
Metallic few-layered VSe2nanosheets: high two-dimensional conductivity for flexible in-plane solid-state supercapacitors
Authors: Wang Chaolun , Wu Xing , Ma Yonghui , Mu Gang , Li Yaoyi , Luo Chen , Xu Hejun , Zhang Yuanyuan , Yang Jing , Tang Xiaodong , Zhang Jian , Bao Wenzhong , Duan Chungang
Published: March 2018

Flexible in-plane solid-state supercapacitor fabricated by CVD-grown metallic VSe2nanosheets presents excellent mechanical stability and high energy density.
Three-step cascade over a single catalyst: synthesis of 5-(ethoxymethyl)furfural from glucose over a hierarchical lamellar multi-functional zeolite catalyst
Authors: Bai Yuanyuan , Wei Lu , Yang Mengfei , Chen Huiyong , Holdren Scott , Zhu Guanghui , Tran Dat T. , Yao Chunli , Sun Runcang , Pan Yanbo , Liu Dongxia
Published: March 2018

Glucose conversion over hierarchical lamellar MFI–Sn/Al: accommodating a three-step reaction cascade over a single catalyst for a high yield of 5-(ethoxymethyl) furfural.
A diketopyrrolopyrrole-based fluorescent porous organic polymer as fluoride sensing monolithic device
Authors: Bi Shiming , Li Yankai , Zhang Shaoze , Hu Jun , Wang Limin , Liu Honglai
Published: March 2018

Diketopyrrolopyrrole-based fluorescent porous organic polymer was successfully immobilized on a macroporous sponge to obtain a fluoride sensing monolithic device.
Piezoelectric‐driven self‐assembling micro air vehicle with bionic reciprocating wings
Authors: Zhou Sui , Zhang Weiping , Zou Yang , Ou Bin , Zhang Yuying , Wang Chenyang
Published: March 2018

A 247 mg weight coin‐size piezoelectric‐driven micro air vehicle (MAV) with four symmetrical distributed bionic flexible wings is presented. The MAV is planar designed and monolithic fabricated via film printed circuit, graphic lasering and lamination process, and is able to be self‐assembled by using shape memory polymer (SMP). The SMP can be heated by the flexible circuit and shrink at a large strain, resulting in the self‐folding of hinges and self‐assembly of MAV from 2D shape into 3D shape. The flexible four‐bar mechanism converts the slight vibration of lead zirconate titanate (PZT) actuator into flexible wings’ reciprocation, thereby generating lift force. The response characteristics and motion behaviour of the MAV are experimentally tested. Results suggest that the prototype can be self‐assembled to the designed position and achieve a 23.5° reciprocating angle at 134 Hz resonance frequency under 280 V driving signals.
Design of reconfigurable frequency‐selective surfaces including the PIN diode threshold region
Authors: Mamedes Deisy Formiga , Gomes Neto Alfrêdo , Costa e Silva Jefferson , Bornemann Jens
Published: March 2018

Reconfigurable frequency‐selective surfaces (RFSSs) are of significant interest in applications, such as secure communication systems or tunable radomes, to improve indoor communication and smart antennas. In order to change the frequency‐selective surface (FSS) characteristics, and therefore its frequency response, conventional methods include loading with active semiconductor devices such as varactors, PIN diodes, Schottky diodes and radio‐frequency microelectromechanical system. Another possibility is the use of mechanical adjusts, such as spring resonators or mechanical rotation. When PIN diodes are used, commonly only the reverse and forward regions, OFF and ON states, respectively, are considered. In this study, the implementation of an RFSS is described, using PIN diodes as active components. The RFSS is based on the four‐arms star geometry, and initial design equations and procedures are presented. Numerical and measured results are shown for different project stages, with a very good agreement. In addition to obtaining two distinct resonant frequencies, due to the OFF and ON states, a third situation is included, considering the PIN diode threshold region when the FSS becomes practically transparent, which is an interesting feature with potential applications.
Breakdown and Partial discharge characteristics of Mineral oil‐based nanofluids
Authors: Muangpratoom Pichai , Pattanadech Norasage
Published: March 2018

In this study, the AC breakdown (BD) voltages and partial discharge (PD) activities of mineral‐oil (MO)‐based nanofluids were investigated under controlled conditions. The aim of this research is to improve the dielectric properties of MO by amalgamation with various types of nanoparticles, i.e. semiconducting and dielectric nanoparticles. Two types of nanoparticles, i.e. titanium dioxide and barium titanate with mean diameters of <100 nm were used in the nanofluid samples prepared for the experiments. The AC BD voltages of the nanofluids were investigated according to IEC 60156. In addition, PD characteristics of the MO‐based nanofluids were examined including PD inception voltage (PDIV) characteristics and PD activity with a needle‐plane electrode configuration. The test circuit was set up in accordance with IEC 60270 and the experiment was performed in conformity with IEC 61294 at room temperature. The test results showed that the AC BD voltages of the modified liquids were clearly influenced by the type of nanoparticles added, with the AC BD voltages of the MO with nanoparticles being slightly higher than those of the unmodified MO used for comparison. Furthermore, the nanoparticles also demonstrated a propensity to increase the PDIV of the nanofluids compared with the PDIV of the MO.
Optimal neuro‐fuzzy control of hepatitis C virus integrated by genetic algorithm
Authors: Khodaei‐Mehr Javad , Tangestanizadeh Samaneh , Vatankhah Ramin , Sharifi Mojtaba
Published: March 2018

Hepatitis C blood born virus is a major cause of liver disease that more than three per cent of people in the world is dealing with, and the spread of hepatitis C virus (HCV) infection in different populations is one of the most important issues in epidemiology. In the present study, a new intelligent controller is developed and tested to control the hepatitis C infection in the population which the authors refer to as an optimal adaptive neuro‐fuzzy controller. To design the controller, some data is required for training the employed adaptive neuro‐fuzzy inference system (ANFIS) which is selected by the genetic algorithm. Using this algorithm, the best control signal for each state condition is chosen in order to minimise an objective function. Then, the prepared data is utilised to build and train the Takagi–Sugeno fuzzy structure of the ANFIS and this structure is used as the controller. Simulation results show that there is a significant decrease in the number of acute‐infected individuals by employing the proposed control method in comparison with the case of no intervention. Moreover, the authors proposed method improves the value of the objective function by 19% compared with the ordinary optimal control methods used previously for HCV epidemic.
Strong non-radial propagation of energetic electrons in solar corona
Authors: Klassen A. , Dresing N. , Gómez-Herrero R. , Heber B. , Veronig A.
Published: March 2018

Analyzing the sequence of solar energetic electron events measured at both STEREO-A (STA) and STEREO-B (STB) spacecraft during 17–21 July 2014, when their orbital separation was 34°, we found evidence of a strong non-radial electron propagation in the solar corona below the solar wind source surface. The impulsive electron events were associated with recurrent flare and jet (hereafter flare/jet) activity at the border of an isolated coronal hole situated close to the solar equator. We have focused our study on the solar energetic particle (SEP) event on 17 July 2014, during which both spacecraft detected a similar impulsive and anisotropic energetic electron event suggesting optimal connection of both spacecraft to the parent particle source, despite the large angular separation between the parent flare and the nominal magnetic footpoints on the source surface of STA and STB of 68° and 90°, respectively. Combining the remote-sensing extreme ultraviolet (EUV) observations, in-situ plasma, magnetic field, and energetic particle data we investigated and discuss here the origin and the propagation trajectory of energetic electrons in the solar corona. We find that the energetic electrons in the energy range of 55–195 keV together with the associated EUV jet were injected from the flare site toward the spacecraft’s magnetic footpoints and propagate along a strongly non-radial and inclined magnetic field below the source surface. From stereoscopic (EUV) observations we estimated the inclination angle of the jet trajectory and the respective magnetic field of 63° ± 11° relative to the radial direction. We show how the flare accelerated electrons reach very distant longitudes in the heliosphere, when the spacecraft are nominally not connected to the particle source. This example illustrates how ballistic backmapping can occasionally fail to characterize the magnetic connectivity during SEP events. This finding also provides an additional mechanism (one among others), which may explain the origin of widespread SEP events.
Tall trends: quantifying the skyscraper phenomenon
Authors: Gabel Jason
Published: March 2018

The world continues to witness an explosion of growth in the number of 200-plus-meter skyscrapers, with three straight years of record-breaking completions (from 2014 to 2016) and a 441 percent increase on the total number of such towers in the 21st century, from 265 in 2000 to 1,168 at the end of 2016. Fueled largely by strong economic performance, much of this activity is centered in Asia and the Middle East, upending longstanding geopolitical trends. China in particular has dominated worldwide skyscraper construction, accounting for two-thirds of all completions in the last calendar year (2016). Further, the traditional role of the skyscraper has diversified, with residential and mixed-use buildings accounting for a greater share of 200-plus-meter buildings. This paper explores these interconnected trends in detail and analyzes both the causes and impacts of an evolving skyscraper industry.
Urban Forest Revolution
Authors: Kucherova Anastasia , Narvaez Hana
Published: March 2018

The tendency of the last 100 years shows the radical change of the proportion between urbanized areas and those dedicated to wild nature and agriculture. Whether we agree with it or not, cities are our future. Also it is confirmed by the annual reports of UNEP that cities are responsible for 75% of CO2 emissions. Among negative consequences of the uncontrolled urban sprawl on the ecology there are: greenhouse effect leading to global warming; increasingly growing number of people affected by respiratory diseases due to the smog; drastic reduction of the biodiversity. The environmental impact and the look of the city of the future is in the hands of the architects of today. At Stefano Boeri Architetti we are exploring one of the possible way of reducing the buildings’ ecological footprint and improving the quality of air in cities. It is called “Vertical Foresting”, an evolution of the revolutionary idea of bringing the trees to the sky, far beyond its first realization – it became a philosophy, a new lifestyle. But first of all, Vertical Forest is a big question mark, addressed to the global community, to the politicians and common people, asking each and every one living in our planet – what can you do for our common home?
Organizing vertical layout environments: a forward-looking development strategy for high-rise building projects
Authors: Magay A.A. , Bulgakova E.A. , Zabelina S.A.
Published: March 2018

The article highlights issues surrounding development of high rise buildings. With the rapid increase of the global population there has been a trend for people to migrate into megacities and has caused the expansion of big city territories. This trend, coupled with the desire for a comfortable living environment, has resulted in numerous problems plaguing the megacity. This article proposes that a viable solution to the problems facing megacities is to create vertical layout environments. Potential options for creating vertical layout environments are set out below including the construction of buildings with atriums. Further, the article puts forth suggested spatial organization of the environment as well as optimal landscaping of high-rise buildings and constructions for the creation of vertical layout environments. Finally, the persuasive reasons for the adoption of vertical layout environments is that it will decrease the amount of developed urban areas, decrease traffic and increase environmental sustainability.
The Global Experience of Deployment of Energy-Efficient Technologies in High-Rise Construction
Authors: Potienko Natalia D. , Kuznetsova Anna A. , Solyakova Darya N. , Klyueva Yulia E.
Published: March 2018

The objective of this research is to examine issues related to the increasing importance of energy-efficient technologies in high-rise construction. The aim of the paper is to investigate modern approaches to building design that involve implementation of various energy-saving technologies in diverse climates and at different structural levels, including the levels of urban development, functionality, planning, construction and engineering. The research methodology is based on the comprehensive analysis of the advanced global expertise in the design and construction of energy-efficient high-rise buildings, with the examination of their positive and negative features. The research also defines the basic principles of energy-efficient architecture. Besides, it draws parallels between the climate characteristics of countries that lead in the field of energy-efficient high-rise construction, on the one hand, and the climate in Russia, on the other, which makes it possible to use the vast experience of many countries, wholly or partially. The paper also gives an analytical review of the results arrived at by implementing energy efficiency principles into high-rise architecture. The study findings determine the impact of energy-efficient technologies on high-rise architecture and planning solutions. In conclusion, the research states that, apart from aesthetic and compositional interpretation of architectural forms, an architect nowadays has to address the task of finding a synthesis between technological and architectural solutions, which requires knowledge of advanced technologies. The study findings reveal that the implementation of modern energy-efficient technologies into high-rise construction is of immediate interest and is sure to bring long-term benefits.
Typological diversity of tall buildings and complexes in relation to their functional structure
Authors: Generalov Viktor P. , Generalova Elena M. , Kalinkina Nadezhda A. , Zhdanova Irina V.
Published: March 2018

The paper focuses on peculiarities of tall buildings and complexes, their typology and its formation in relation to their functional structure. The research is based on the analysis of tall buildings and complexes and identifies the following main functional elements of their formation: residential, administrative (office), hotel elements. The paper also considers the following services as «disseminated» in the space-planning structure: shops, medicine, entertainment, kids and sports facilities, etc., their location in the structure of the total bulk of the building and their impact on typological diversity. Research results include suggestions to add such concepts as «single-function tall buildings» and «mixed-use tall buildings and complexes» into the classification of tall buildings. In addition, if a single-function building or complex performs serving functions, it is proposed to add such concepts as «a residential tall building (complex) with provision of services», «an administrative (public) tall building (complex) with provision of services» into the classification of tall buildings. For mixed-use buildings and complexes the following terms are suggested: «a mixed-use tall building with provision of services», «a mixed-use tall complex with provision of services».
The architecture and artistic features of high-rise buildings in USSR and the United States of America during the first half of the twentieth century
Authors: Golovina Svetlana , Oblasov Yurii
Published: March 2018

Skyscraper is a significant architectural structure in the world's largest cities. The appearance of a skyscraper in the city's architectural composition enhances its status, introduces dynamics into the shape of the city, modernizes the existing environment. Its architectural structure which can have both expressive triumphal forms and ascetic ones. For a deep understanding of the architecture of high-rise buildings must be considered by several criteria. Various approaches can be found in the competitive development of high-rise buildings in Moscow and the US cities in the middle of the twentieth century In this article we will consider how and on the basis of what the architectural decisions of high-rise buildings were formed.
Architectural and town-planning reconstruction problems of the city of Voronezh
Authors: Mikhaylova TTatyana , Parshin Dmitriy , Shoshinov Vitaly , Trebukhin Anatoliy
Published: March 2018

The analysis of the state of the historically developed urban district of the city of Voronezh is made. The ways of solving the identified architectural and urban problems of reconstruction of historically developed buildings are proposed. The concept of reconstruction of a territory with historical buildings along Vaytsekhovsky Street is presented.
High-rise construction as a method for architectural development of megapolises
Authors: Kankhva Vadim
Published: March 2018

The article analyzes the current state of urban development in Moscow, there are revealed the insights into pattern of large investment projects. The regulatory framework as well as the state and the forecast of housing funds are scrutinized. A number of problems, that are related to the implementation of high-rise construction projects at all stages of the life cycles, are highlighted by the example of unique facilities, which are under construction or have already been built. Substantiation of high-rise construction by the transport hubs in megapolises is given. There are also considered main advantages of Moscow renovation project and criticism against it.
The Impact of High-Rise Buildings on the Living Environment
Authors: Giyasov Botir , Giyasova Irina
Published: March 2018

Urbanization as a socio-economic process manifested in the concentration of the population in modern big cities contributes to the development of high-rise building construction. With the development of education and culture, changing leisure habits, city residents put forward new architectural and functional requirements to the living environment and urban infrastructure. This calls for the creation of new types and forms of residential buildings, the structure of the city and transport networks. In addition, the need to develop high-rise building construction is justified by the growing demand for residential, public and administrative buildings and the lack of free space.The paper analyzes the development of high-rise building construction in urban areas. The problem of the impact of high-rise building construction in big cities on the living environment is considered. Using analytical methods, causes and sources of pollution, such as transport and engineering infrastructure have been identified. In some urban areas, there are zones with modified thermal conditions and air exchange resulting in the formation of the “urban heat island”The qualitative and quantitative characteristics of variations in temperature and wind speed with respect to the height of the building have been calculated, using the example of the Evolution Tower of the Moscow International Business Center (“Moscow City”). Calculation and comparative analysis for the cities of Moscow, Khanty-Mansiysk and Vladivostok has made it possible to assess the variation in temperature and wind speed and their impact on the living environment under different climatic conditions.
Effect of aerated concrete blockwork joints on the heat transfer performance uniformity
Authors: Pukhkal Viktor , Murgul Vera
Published: March 2018

Analysis of data on the effect of joints of the aerated concrete blocks on the heat transfer uniformity of exterior walls was carried out. It was concluded, that the values of the heat transfer performance uniformity factor in the literature sources were obtained for the regular fragment of a wall construction by approximate addition of thermal conductivities. Heat flow patterns for the aerated concrete exterior walls amid different values of the thermal conductivity factors and design ambient air temperature of -26 °C were calculated with the use of “ELCUT” software for modelling of thermal patterns by finite element method. There were defined the values for the heat transfer performance uniformity factor, reduced total thermal resistance and heat-flux density for the exterior walls. The calculated values of the heat transfer performance uniformity factors, as a function of the coefficient of thermal conductivity of aerated concrete blocks, differ from the known data by a more rigorous thermal and physical substantiation.
Complex analysis of energy efficiency in operated high-rise residential building: Case study
Authors: Korniyenko Sergey
Published: March 2018

Energy conservation and human thermal comfort enhancement in buildings is a topical issue of modern architecture and construction. The innovative solution of this problem makes it possible to enhance building ecological and maintenance safety, to reduce hydrocarbon fuel consumption, and to improve life standard of people. The requirements to increase of energy efficiency in buildings should be provided at all the stages of building's life cycle that is at the stage of design, construction and maintenance of buildings. The research purpose is complex analysis of energy efficiency in operated high-rise residential building. Many actions for building energy efficiency are realized according to the project; mainly it is the effective building envelope and engineering systems. Based on results of measurements the energy indicators of the building during annual period have been calculated. The main reason of increase in heat losses consists in the raised infiltration of external air in the building through a building envelope owing to the increased air permeability of windows and balcony doors (construction defects). Thermorenovation of the building based on ventilating and infiltration heat losses reduction through a building envelope allows reducing annual energy consumption. Energy efficiency assessment based on the total annual energy consumption of building, including energy indices for heating and a ventilation, hot water supply and electricity supply, in comparison with heating is more complete. The account of various components in building energy balance completely corresponds to modern direction of researches on energy conservation and thermal comfort enhancement in buildings.
Construction of high-rise buildings in the Far East of Russia
Authors: Kudryavtsev Sergey , Bugunov Semen , Pogulyaeva Evgeniya , Peters Anastasiya , Kotenko Zhanna , Grigor'yev Danil
Published: March 2018

The construction of high-rise buildings on plate foundation in geotechnical conditions of the Russian Far East is a complicated problem. In this respect foundation engineering becomes rather essential. In order to set a firm foundation it is necessary to take into account the pressure distribution at the structure base, in homogeneity of building deformation, which is due to collaborative geotechnical calculations complicated by a number of factors: actual over-placement of soils, the complex geometry of the building under construction, spatial work of the foundation ground with consideration for physical nonlinearity, the influence of the stiffness of the superstructure (reinforced concrete framing) upon the development of foundation deformations, foundation performance (the performance of the bed plate under the building and stairwells), the origination of internal forces in the superstructure with differential settlement. The solution of spatial problems regarding the mutual interaction between buildings and foundations with account of the factors mentioned above is fully achievable via the application of numerical modeling methodology. The work makes a review of the results of high-rise plate building numerical modeling in geotechnical conditions of the Russian Far East by way of the example of Khabarovsk city.
Effect of Rice Husk Ash and Fly Ash on the workability of concrete mixture in the High-Rise Construction
Authors: Van Tang Lam , Bulgakov Boris , Bazhenova Sofia , Aleksandrova Olga , Ngoc Pham Anh , Dinh Vu Tho
Published: March 2018

The dense development of high-rise construction in urban areas requires a creation of new concretes with essential properties and innovative technologies for preparing concrete mixtures. Besides, it is necessary to develop new ways of presenting concrete mixture and keeping their mobility. This research uses the mathematical method of two-factors rotatable central compositional planning to imitate the effect of amount of rice husk (RHA) and fly ash of thermal power plants (FA) on the workability of high-mobility concrete mixtures. The results of this study displays regression equation of the second order dependence of the objective functions - slump cone and loss of concrete mixture mobility due to the input factors - the amounts RHA (x1) and FA (x2), as well as the surface expression image of these regression equations. An analysis of the regression equations also shows that the amount of RHA and FA had a significant influence on the concrete mixtures mobility. In fact, the particles of RHA and FA will play the role as peculiar "sliding bearings" between the grains of cement leading to the dispersion of cement in the concrete mixture. Therefore, it is possible to regulate the concrete mixture mobility when transporting fresh concrete to the formwork during the high-rise buildings construction in the hot and humid climate of Vietnam. Although the average value of slump test of freshly mixed concrete, measured 60 minutes later after the mixing completion, decreased from 18.2 to 10.52 cm, this value still remained within the allowable range to maintain the mixing and and the delivery of concrete mixture by pumping.
Quality assessment of urban areas based on neural network modeling and GIS
Authors: Popova Olga , Glebova Julia , Pustovgar Andrey
Published: March 2018

In this article the authors carry out the research of the urban development areas structure and propose the system of its characteristics on the basis of sector affiliation of the municipal economy. The authors have developed an algorithm for quality assessment of urban development areas. The results of the research are presented on the example of several central quarters of Arkhangelsk city. The city’s residential development was formed in the periods from 1900-1950, 1950-1980 and from 2002 to date. It is currently presented by low-rise wooden, homestead type residential houses and barracks-type houses; mid-rise and high-rise brick and panel buildings of typical development, buildings of large-panel housing construction. Structural SOM-analysis compiled separate quarters of Arkhangelsk into 5 groups with a high level of characteristic similarity: "Commercial", "Prospective complex development", "Sustainable development", "Perspective renovation of residential development", "Investment-unattractive". Typical development strategies for each group of quarters are determined. Most developed areas characterized by upward height. The development strategies for depressed areas is in a high-rise building, which show the economic, social and environmental benefits of upward growth of the city. Using GIS allows to visually reflect the state and assess the quality of the urban development area by the aggregate of all parameters, and also to assess the quality of the quarters for each sector.
Analysis of high-rise constructions with the using of three-dimensional models of rods in the finite element program PRINS
Authors: Agapov Vladimir
Published: March 2018

The necessity of new approaches to the modeling of rods in the analysis of high-rise constructions is justified. The possibility of the application of the three-dimensional superelements of rods with rectangular cross section for the static and dynamic calculation of the bar and combined structures is considered. The results of the eighteen-story spatial frame free vibrations analysis using both one-dimensional and three-dimensional models of rods are presented. A comparative analysis of the obtained results is carried out and the conclusions on the possibility of three-dimensional superelements application in static and dynamic analysis of high-rise constructions are given on its basis.
The reliability of multistory buildings with the effect of non-uniform settlements of foundation
Authors: Al’ Malul Rafik , Gadzhuntsev Michail
Published: March 2018

The issue is the evaluation of reliability of construction considering the influence of the variation of the support settlement, which is changing during the lifetime of constructions due to the consolidation process of the ground. Recently, the specialists give special emphasis to the necessity to develop the methods for the estimation of reliability and durability of structures. The problem, the article considers, is the determination of the reliability of multistory buildings with non-uniform changing-in-time sediments caused by the consolidation process in soils. Failure of structures may occur before the draft reaches it`s stabilizing value, because of the violations of the conditions of normal use.
Complex assessment of urban housing energy sustainability
Authors: Popova Olga , Glebova Julia , Karakozova Irina
Published: March 2018

The article presents the results of a complex experimental-analytical research of residential development energy parameters - survey of construction sites and determination of calculated energy parameters (resistance to heat transfer) considering their technical condition. The authors suggest a methodology for assessing residential development energy parameters on the basis of construction project’s structural analysis with the use of advanced intelligent collection systems, processing (self-organizing maps - SOM) and data visualization (geo-informational systems - GIS). SOM clustering permitted to divide the housing stock (on the example of Arkhangelsk city) into groups with similar technical-operational and energy parameters. It is also possible to measure energy parameters of construction project of each cluster by comparing them with reference (normative) measures and also with each other. The authors propose mechanisms for increasing the area’s energy stability level by implementing a set of reproduction activities for residential development of various groups. The analysis showed that modern multilevel and high-rise construction buildings have the least heat losses. At present, however, ow-rise wood buildings is the dominant styles of buildings of Arkhangelsk city. Data visualisation on the created heat map showed that such housing stock covers the largest urban area. The development strategies for depressed areas is in a high-rise building, which show the economic, social and environmental benefits of upward growth of the city. An urban regeneration programme for severely rundown urban housing estates is in a high-rise construction building, which show the economic, social and environmental benefits of upward growth of the city.
Partitions for high-rise construction using phosphogypsum
Authors: Zolotukhin Sergey , Kukina Olga , Abramenko Anatoly
Published: March 2018

Gypsum blocks are usually used to make partitions in highrise construction. Reducing the cost of materials used in high-rise construction is an urgent task of modern material science. Phosphogypsum dihydrate, which has binding properties, is one of the large-tonnage waste. The authors have proved that, after years of storage in heaps, water-soluble phosphates, fluorides and other additives included in the structure of fresh phosphogypsum dissolved in water due to weathering (humidification-drying, freezing-thawing in a water-saturated state), and the calcium hydro-and dihydrogen phosphates ingressed in the lattice underwent complete hydrolysis and disintegration, thereby changing the physicochemical properties of phosphogypsum. The data obtained by the authors on the absence of water-soluble compounds of phosphorus, fluorine in stale phosphogypsum indicate its ecological purity and the possibility of application in housing construction. Having analyzed the data of modern methods of differential scanning calorimetry and scanning electron microscopy, the authors predicted and proved by the energy of dehydration of phosphogypsum dihydrate, lime, sandy loam, the possibility of obtaining non-flammable materials with sufficient strength for wall materials. Understanding the processes occurring in water films (the thickness of the water film, the pressure, the temperature and the pH of the aqueous extract of the mixture, the drying of the materials produced), made it possible to develop a technology for obtaining wall products from lime-sandy phosphogypsum material using typical silicate brick production equipment and vibropresses for key-cog blocks production.
Modern energy efficient technologies of high-rise construction
Authors: Lukmanova Inessa , Golov Roman
Published: March 2018

The paper analyzes modern energy-efficient technologies, both being applied, and only introduced into the application in the construction of high-rise residential buildings. All technologies are systematized by the authors as part of a unified model of "Arrows of Energy-Efficient Technologies", which imply performing energy-saving measures in the design, construction and operation of buildings.
Conducting experimental investigations of wind influence on high-rise constructions
Authors: Poddaeva Olga I. , Fedosova Anastasia N. , Churin Pavel S. , Gribach Julia S.
Published: March 2018

The design of buildings with a height of more than 100 meters is accompanied by strict control in determining the external loads and the subsequent calculation of building structures, which is due to the uniqueness of these facilities. An important factor, the impact of which must be carefully studied at the stage of development of project documentation, is the wind. This work is devoted to the problem of studying the wind impact on buildings above 100 meters. In the article the technique of carrying out of experimental researches of wind influence on high-rise buildings and constructions, developed in the Educational-research-and-production laboratory on aerodynamic and aeroacoustic tests of building designs of NRU MGSU is presented. The publication contains a description of the main stages of the implementation of wind tunnel tests. The article presents the approbation of the methodology, based on the presented algorithm, on the example of a high-rise building under construction. This paper reflects the key requirements that are established at different stages of performing wind impact studies, as well as the results obtained, including the average values of the aerodynamic pressure coefficients, total forces and aerodynamic drag coefficients. Based on the results of the work, conclusions are presented.
Preparation and properties of hybrid materials for high-rise constructions
Authors: Matseevich Tatyana
Published: March 2018

The theme of the research is important because it allows to use hybrid materials as finishing in the high-rise constructions. The aim of the study was the development of producing coloured hybrid materials based on liquid glass, a polyisocyanate, epoxy resin and 2.4-toluylenediisocyanate. The detailed study of the process of stress relaxation at different temperatures in the range of 20-100°C was provided. The study found that the obtained materials are subject to the simplified technology. The materials easy to turn different colors, and dyes (e.g. Sudan blue G) are the catalysts for the curing process of the polymeric precursors. The materials have improved mechanical relaxation properties, possess different color and presentable, can be easily combined with inorganic base (concrete, metal). The limit of compressive strength varies from 32 to 17.5 MPa at a temperature of 20 to 100°C. The values σ∞ are from 20.4 to 7.7 MPa within the temperature range from 20 to 100°C. The physical parameters of materials were evaluated basing on the data of stress relaxation: the initial stress σ0, which occurs at the end of the deformation to a predetermined value; quasi-equilibrium stress σ∞, which persists for a long time relaxation process. Obtained master curves provide prediction relaxation behavior for large durations of relaxation. The study obtained new results. So, the addition of epoxy resin in the composition of the precursor improves the properties of hybrid materials. By the method of IR spectroscopy identified chemical transformations in the course of obtaining the hybrid material. Evaluated mechanical performance of these materials is long-time. Applied modern physically-based memory functions, which perfectly describe the stress relaxation process.
Calculation of high-rise construction limitations for non-resident housing fund in megacities
Authors: Iliashenko Oksana , Krasnov Sergey , Sergeev Sergey
Published: March 2018

The paper is devoted to topical issues of urban planning in terms of high-rise construction of a non-resident housing stock in relation to megacities. We consider this issue taking into account the limitations of natural, communal and social resources. The problem is especially acute for the overwhelming majority of the state capitals, as well as cities with historical heritage that are of great interest due to the rapid development of tourism and the high mobility of the population in the world. The growth of the population of many states capitals led to the use of high-rise buildings as a non-resident housing stock. However, there are a number of restrictions on the high-rise construction of non-resident housing stock in megacities. The authors formalize the problem of determining the optimal ratio of the volume of urban buildings belonging to the high-rise buildings types and intended for non-residents to a common housing fund. We conduct economic calculations to determine the quantitative indicators. It can be used as the basis for administrative measures aimed at limiting the people flow arriving with the intention of temporarily deploying in megacities.
The Application of the Real Options Method for the Evaluation of High-Rise Construction Projects
Authors: Izotov Aleksandr , Rostova Olga , Dubgorn Alissa
Published: March 2018

The paper is devoted to the problem of evaluation of high-rise construction projects in a rapidly changing environment. The authors proposed an algorithm for constructing and embedding real options in high-rise construction projects, which makes it possible to increase the flexibility of managing multi-stage projects that have the ability to adapt to changing conditions of implementation.
Analysis of administrative barriers in the industry of the high-rise construction in Russian Federation
Authors: Zaychenko Irina , Borremans Alexandra , Gutman Svetlana
Published: March 2018

The article describes the concept and types of administrative barriers encountered in various areas of the enterprise. The particularities of the Russian high-rise construction industry are described and a comparative analysis of administrative barriers in this sector is performed. The main stages and administrative procedures when the developers implement investment and construction projects in the field of high-rise construction are determined. The regulatory and legal framework for the implementation of investment and project activities in the high-rise construction industry has been studied and conclusions have been drawn on its low level of precision in the issue of the formation of competitive and efficient high-rise construction markets. The average number of administrative procedures for the implementation of the investment and construction project in the field of high-rise construction is determined. The factors preventing the reduction of administrative barriers in the high-rise construction industry are revealed.
Problems of increased transport load as a result of implementation of projects of high-rise constructions
Authors: Provotorov Ivan , Gasilov Valentin , Anisimova Nadezhda
Published: March 2018

The structure of problems of high-rise construction us suggested, which includes the impact on environment, design solutions, transportation problems, financial costs for construction and operation, and others. Positive and negative aspects of high-rise construction are considered. One of the basic problems of high-rise construction is the problem of increased transport load. Construction of the subway on the basis of the concession mechanism, with the use of unmanned control of rolling stock is proposed as the most expedient solution. An evaluation of the effectiveness of this project is presented, it shows quite high performance indicators for a private investor. Main problems that the project implementation may face in conditions of lack of scientific and methodological support are outlined.
Models of resource planning during formation of calendar construction plans for erection of high-rise buildings
Authors: Pocebneva Irina , Belousov Vadim , Fateeva Irina
Published: March 2018

This article provides a methodical description of resource-time analysis for a wide range of requirements imposed for resource consumption processes in scheduling tasks during the construction of high-rise buildings and facilities. The core of the proposed approach and is the resource models being determined. The generalized network models are the elements of those models, the amount of which can be too large to carry out the analysis of each element. Therefore, the problem is to approximate the original resource model by simpler time models, when their amount is not very large.
Economic efficiency of application of innovative materials and structures in high-rise construction
Authors: Golov Roman , Dikareva Varvara , Gorshkov Roman , Agarkov Anatoly
Published: March 2018

The article is devoted to the analysis of technical and economic efficiency of application of tube confined concrete structures in high-rise construction. The study of comparative costs of materials with the use of different supporting columns was carried out. The main design, operational, technological and economic advantages of the tube confined concrete technology were evaluated, conclusions were drawn about the high strength and deformation properties of axial compression of steel tubes filled with high-strength concrete. The efficiency of the tube confined concrete use is substantiated, which depends mainly on the scale factor and percentage of reinforcement affecting its load-bearing capacity.