bluuebunny/crossref_metadata_2025 huggingface dataset:
3D Reconstruction for the Interpretation of Partly Lost or Never Accomplished Architectural Heritage
Authors: Casu Paola , Pisu Claudia
Published: February 2019

During the past years there has been the birth of significant projects about digitization and virtual preservation of cultural heritage. Such panorama offers great chance to develop 3D modeling for cultural heritage. 3D reconstruction offers a chance to digitize historic objects which are still extant, and also to reconstruct and visualize objects which are no longer extant and that can only be known from historic descriptions or depictions. The chapter focus on the latter aspect. In fact, 3D modeling of extant objects is technologically or logistically challenging but virtual reconstruction of non- or no longer- existent items adds more importance to interpretation of historic sources. This chapter illustrates the current situation taking into account the state of the art, the different suggestions in solving such kind of problem, and through up to date examples will suggest a possible unified method to give life to both lost buildings and never built ones. The goal is to find common points with other similar cases, to obtain a common procedure and to suggest ways of development.
Nurturing a Geospatially Empowered Next Generation
Authors: Starkenburg Derek , Waigl Christine F. , Gens Rudiger
Published: February 2019

For new generations of citizens in all countries, a level of proficiency in geospatial concepts and skills will be required to realize the potential of professional and developmental opportunities. The teaching of geospatial skills links into traditional science, technology, engineering, and mathematics (STEM) curriculum objectives, community-wide concerns and initiatives, and global citizenship. Therefore, by the pre-university and undergraduate level, it is desirable for each student to have acquired such competencies. Free and open-source tools that are accessible and affordable in most areas of the world, along with data availability, offer an opportunity to support teaching such a curriculum. Here, core geospatial concepts are introduced, along with available data and tools. Then, using three scenarios, it is shown how the core concepts can be applied to different settings for educational purposes.
Quantifying Urban Sprawl With Spatial Autocorrelation Techniques Using Multi-Temporal Satellite Data
Authors: Nolè Gabriele , Lasaponara Rosa , Lanorte Antonio , Murgante Beniamino
Published: February 2019

This study deals with the use of satellite TM multi-temporal data coupled with statistical analyses to quantitatively estimate urban expansion and soil consumption for small towns in southern Italy. The investigated area is close to Bari and was selected because highly representative for Italian urban areas. To cope with the fact that small changes have to be captured and extracted from TM multi-temporal data sets, we adopted the use of spectral indices to emphasize occurring changes, and geospatial data analysis to reveal spatial patterns. Analyses have been carried out using global and local spatial autocorrelation, applied to multi-date NASA Landsat images acquired in 1999 and 2009 and available free of charge. Moreover, in this paper each step of data processing has been carried out using free or open source software tools, such as, operating system (Linux Ubuntu), GIS software (GRASS GIS and Quantum GIS) and software for statistical analysis of data (R). This aspect is very important, since it puts no limits and allows everybody to carry out spatial analyses on remote sensing data. This approach can be very useful to assess and map land cover change and soil degradation, even for small urbanized areas, as in the case of Italy, where recently an increasing number of devastating flash floods have been recorded. These events have been mainly linked to urban expansion and soil consumption and have caused loss of human lives along with enormous damages to urban settlements, bridges, roads, agricultural activities, etc. In these cases, remote sensing can provide reliable operational low cost tools to assess, quantify and map risk areas.
Providing an Attractive Environment for People to Engage in Health Activities
Authors: Hsu Hung-Pin
Published: February 2019

Parks and green spaces have been allocated for city residents to offer them healthier natural environments. However, people living in cities may have less opportunity to engage with the natural environment since parks seem to be passive locations of activity. We investigated how to proactively enhance the attraction of green space to improve people's health. First, we surveyed how 683 city residents were engaged in physical activities. From them, 30 people were recruited for depth interviews. Results showed that the park environment and the health activities that feature ‘inner-attraction' could enhance the frequency and persistence of the city residents to engage in healthy activities. We also evaluated the service experience and attraction of 40 users in a 3-month program in the Daan Forest Park of Taipei City in Taiwan. Using the culture probes method, we found that the experience cycle and the use of social media enhanced the park's inner and inter attraction, and that the role of the park was transformed from a passive green space provider to an active service operator.
Between Cuvier and Darwin
Authors: Brusaporci Stefano
Published: February 2019

The chapter presents a reflection on the evolution of cultural heritage concept, from the second half of the 20th century until now, moving the attention from the distinction between natural and anthropic heritage to tangible and intangible matters. According to the line from postmodernism to new materialism, the idea of heritage reflects an evolving and inclusive cultural approach, where the notions of place and landscape combine tangible/intangible issues and participative involvement in heritage definition, keeping in mind problems of memory, integrity and authenticity.
Ecosystems as Agent Societies, Landscapes as Multi-Societal Agent Systems
Authors: Costa Antonio Carlos da Rocha
Published: February 2019

Landscape ecology concerns the analysis, modeling and management of landscapes and their component ecosystems, mostly in view of the effects of the anthropic actions that they may suffer. As such, landscape ecology is well amenable to be supported by agent-based computational tools. In this chapter, we introduce the concept of “multi-societal agent system”, a formal architectural model for distributed multi-agent systems, and we interpret it in ecological terms, to serve as an agent-based theoretical foundation for computer-aided landscape ecology. More specifically, we introduce the “ecosystems as agent societies” and “landscapes as multi-societal agent systems” approaches to ecosystems and landscapes, together with the core elements of the agent-based architectural models that support such approaches. The elements of those architectural models are then used to formally capture the main organizational and functional aspects of ecosystems and landscapes.
Running After Time
Authors: Santos Ivone Neiva , Azevedo José
Published: February 2019

We live in a paradoxical age marked by the widespread perception that life is faster than it used to be, that quick access to people and information will free us to do other things, and simultaneously, most of us have experienced this creeping sense that time is slipping out of our control. That perception is a source of concern and even anguish considering the need we feel to follow the pace “imposed” by technology. The chapter starts by exploring the concept of time, from Heidegger's notion of time as temporality, the lived time, to the concept of real time, inherited from human-computer interaction studies, reflecting the immediacy and simultaneity that characterizes temporality in the digital age. The chapter discusses different perspectives of temporality, considering its relations to technology and power in four main intersections: temporality and technology, temporality and real time, temporality and power, and temporality and deceleration.
The Screens of Our Time
Authors: Wiberg Mikael , Wiberg Britt
Published: February 2019

Despite the increasing interest in understanding screen time and its effects, there are very few papers published on how the notion of “screen time” is conceptualized – both in terms of what “time” refers to in this context and in terms of what a “screen” denotes nowadays. In an attempt to contribute to this lack of theoretical grounding, the authors outline four theoretical grounds for understanding time. Further, they suggest that the notion of “screen” needs to be problematized in similar ways. In this chapter, the authors illustrate how the four different conceptualizations of “time” in relation to this broader understanding of screens open up for a new range of studies of “screen time,” and they suggest that this conceptualization is necessary in order to move toward.
Returning to the TV Screen
Authors: Abreu Jorge Ferraz , Almeida Pedro , Velhinho Ana , Varsori Enrickson
Published: February 2019

Given the continuous transformation of the video consumption across multiple devices, this chapter has the main goal of characterizing the viewer behaviors at home, including the motivations for specific interactive television (iTV) features. An online survey was conducted with the aim of clarifying if the consumption patterns at home are contributing to the demand for unification services that combine videos from internet sources with TV content. The results highlight some insights regarding the preferred devices depending on age and the content source, as well as limitations and valued features to be considered in the development of future unification and personalization services. The results from this study are useful, not only to understand the dynamics of audiovisual consumption regarding the “future of television,” but can also be applied to foster product-oriented projects based on the synergies between behavioral factors, technological innovations, and industry trends regarding audiences' needs and UX.
If It Ticks Like a Clock, It Should Be Time Perspective
Authors: Ortuño Victor E. C.
Published: February 2019

In recent years, the concept of time perspective has acquired a prominent position within the psychology of time. After Zimbardo and Boyd´s seminal work, thousands of papers have cited its work and within the last decade; several books and papers of other authors have been dedicated to exploring and expanding its theory. Even when considering other relevant authors about this topic, such as Nuttin and Lens, among many others, Zimbardo´s theory has become a synonym of time perspective research. This chapter represents an effort to identify some of the existent shortcomings in subjective time research and more specifically in time perspective topics. This chapter intends to encourage a mostly needed discussion about what the actual state of the research being developed is and what precautions should be taken into consideration in future researches.
The Destructuring of Time in Psychosis
Authors: Rodriguez Richard J. , Ortuño Victor E.C.
Published: February 2019

This chapter intends to interact and integrate different perspectives that address temporality as a dimension that shapes the human being's life. On the other hand, temporality as a variable or universal dimension structures both the normal and abnormal life of people, having approached the subject from the perspective of psychiatrists of the Franco-German tradition to explain and phenomenologically understand the experience of time in psychosis. At present, understanding and interdisciplinary work should be taken into account and integrated for their application in the psychosocial rehabilitation of people with this pathology, recognizing also that the subject has not obtained concrete or satisfactory answers even today.
Exploring Abandoned GIS Research to Augment Applied Geography Education
Authors: DeMers Michael
Published: February 2019

Applied geography has enjoyed a revival in large part due to the increased availability of geospatial software often resulting in its wholesale adoption in applied geography programs throughout academia. One unintended consequence of this adoption is that much of the conceptual content responsible for the historical development of GIS is largely not covered in the applied geography coursework. When applied geography programs focus on software application without considering its limitations, the applied geography student gets the misconception that the geographic underpinnings upon which the software is based are thoroughly understood and tested. A result of this, applied geography students often employ the tools with little or no understanding of their limitations for modeling real geographic processes. This article proposes that one aspect of an applied geography curriculum must include the study of the underlying principles upon which the software is based, and perhaps more importantly, the study of concepts that were abandoned in the early days of tool development.
Applying the Geohumanities
Authors: Magrane Eric
Published: February 2019

In recent years, geography has taken up a renewed engagement with humanities approaches to place, space, and environment. These approaches offer new possibilities for relevant, publicly engaged research and teaching; applying the geohumanities expands the techniques that geographers can employ to do engaged work in the face of great social and environmental challenges. This article describes two examples of applied geohumanities projects: a community course on climate change and poetry and a creative approach to a citizen science bioblitz. Building on these examples, four questions for future work in applied geohumanities are posed.
The Integrative Nature of Geography
Authors: Labosier Christopher F.
Published: February 2019

A firm definition of geography is often elusive and at times, the field is criticized for borrowing heavily from other disciplines. However, this article argues that the real strength of geography is its integrative nature. The purpose of this article is to discuss geography's integrative nature and how this strength can be integrated into the undergraduate environmental science curriculum. Two brief examples are provided from the author's own teaching and research experiences. Concept mapping in an introductory environmental science class allows students to visualize the complexity and integrative nature of environmental issues. In the atmospheric science classroom, students are introduced not only to the physical processes of weather hazards, but to the social dimensions as well. It is imperative that future scientists, advocates, and decision makers learn to critically integrate across disciplines to solve the world's most pressing environmental issues.
Effective E-Healthcare System
Authors: Sinha Harshit , Raj Gaurav , Choudhury Tanupriya , Kumar Praveen
Published: February 2019

Focus of health care data research has shifted towards configuring and handling e-health information from heterogeneous e-health administration entities in a Content Distribution Network (CDN) for gaining e-health benefits which may be a testing errand. In recent trends, CDNis typically is used to reserve e-health networking substance as ongoing images captured in real time sequences and ongoing videos. In mobile cloud computing, due to patient's movement, it is required for medicinal services professionals to bring information of patient health with quick access of e-health data to make effective choices and select medication. Caching and its invalidation mechanism will provide the solutions in effective e-health data availability. A lot of caching methodologies are proposed, such as the Scalable Asynchronous Cache Consistency Scheme (SACCS) which has demonstrated more versatility over others. In this article, the authors recommend another reserve reinstatement algorithm with SACCS in consideration that is dependent upon rule-based Least Profit Value.
Logical and Physical Design of Spatial Non-Strict Hierarchies in Relational Spatial Data Warehouse
Authors: Ibtisam Ferrahi Ibtisam , Bimonte Sandro , Boukhalfa Kamel
Published: February 2019

The emergence of spatial or geographic data in DW Systems defines new models that support the storage and manipulation of the data. The need to build an SDW and to optimize SOLAP queries continues to attract the interest of researchers in recent years. Several spatial data models have been investigated to extend classical multidimensional data models with spatial concepts. However, most of existing models do not handle a non-strict spatial hierarchy. Moreover, the complexity of the spatial data makes the execution time of spatial queries very considerable. Often, spatial indexation methods are applied to optimizing access to large volumes of data and helps reduce the cost of spatial OLAP queries. Most of existing indexes support predefined spatial hierarchies. The authors show, in this article, that the logical models proposed in the literature and indexing techniques are not suitable to non-strict hierarchies. The authors propose a new logical schema supporting the non-strict hierarchies and a bitmap index to optimize queries defined by spatial dimensions with several non-strict hierarchies.
Mining Top-k Regular High-Utility Itemsets in Transactional Databases
Authors: Kumari P. Lalitha , Sanjeevi S. G. , Rao T.V. Madhusudhana
Published: February 2019

Mining high-utility itemsets is an important task in the area of data mining. It involves exponential mining space and returns a very large number of high-utility itemsets. In a real-time scenario, it is often sufficient to mine a small number of high-utility itemsets based on user-specified interestingness. Recently, the temporal regularity of an itemset is considered as an important interesting criterion for many applications. Methods for finding the regular high utility itemsets suffers from setting the threshold value. To address this problem, a novel algorithm called as TKRHU (Top k Regular High Utility Itemset) Miner is proposed to mine top-k high utility itemsets that appears regularly where k represents the desired number of regular high itemsets. A novel list structure RUL and efficient pruning techniques are developed to discover the top-k regular itemsets with high profit. Efficient pruning techniques are designed for reducing search space. Experimental results show that proposed algorithm using novel list structure achieves high efficiency in terms of runtime and space.
Influences of Online Negative Word of Mouth on Purchase Intention
Authors: Chen Yi-Fen , Tsai Chia-Wen , Chaung Yi-Che
Published: February 2019

This study presents two experiments that examine the influence of electronic negative word of mouth (e-NWOM). Experiment 1 investigated perceived credibility based on 2 (product awareness: high / low) × 2 (strength of WOM: high / low) × 2 (product type: search good / experience good). Experiment 2 investigated purchase intention based on 2 (product utility: high / low). The experiments involved 530 people from Taiwan. The results indicated that high product awareness and weak e-WOM have less influence on consumer perceived credibility of the e-WOM. E-NWOM for a search good has less influence on consumer perceived credibility than for an experience good. The results also indicated that high utility of products increase sales.
Designing Digital Badges for Educational Games
Authors: Biles Melissa L. , Plass Jan L. , Homer Bruce D.
Published: February 2019

Findings from two studies on the design of digital badges for a middle school geometry game and their impact on motivational and cognitive learning outcomes are reported. Study 1 compared the effect of badges in the game to a group with no badges. Badges did not increase posttest performance for all. Learners with high situational interest performed better with badges, learners with low situational interest performed worse with badges. Study 2 compared mastery goal orientation badges with performance goal orientation badges. The interaction of condition and situational interest from Study 1 was replicated. Furthermore, students receiving performance badges performed better on the posttest than students in the mastery badges condition; the no-badges condition was not different from either of the other conditions. Results suggest badges do not always help in educational video games: Types of badges interact with students' interest and motivation to affect learning outcomes.
Collecting Ecologically Valid Data in Location-Aware Augmented Reality Settings
Authors: Kyza Eleni A. , Georgiou Yiannis , Souropetsis Markos , Agesilaou Andria
Published: February 2019

Collecting data in a mobile augmented reality (AR) settings is challenging, as participants are dispersed in the physical space and move often; therefore, it is imperative that new techniques are investigated to facilitate richer and more ecologically-valid data collection. This study examined three in vivo techniques for collecting authentic data in mobile, AR learning situations: (a) tablet-based audio recording, (b) students' researcher-led videotaping, and (c) head-mounted wearable cameras. Participants were eighteen 11th grade students, working in pairs. All students completed individual questionnaires examining their perception of the intrusiveness of the data collection technique and participated in interviews about the intrusiveness of technique. Audio and video from students' work was also collected. Findings are used to discuss the advantages and disadvantages of each data collection technique as a method for collecting data in location-aware augmented reality studies.
A Real-Time Twitter Trend Analysis and Visualization Framework
Authors: Murthy Jamuna S , G.M. Siddesh , K.G. Srinivasa
Published: February 2019

Trend analysis over Twitter offers organizations a fast and effective way of predicting the future trends. In the recent years, a wide range of indicators and methods were used for predicting the trend on Twitter with varying results, unfortunately most of the research focused only on the emerging trends which has gained long-term attention on the Twitter platform. This article depicts trend variations, i.e. to predict whether the trend on Twitter will gain attention or not in the next few hours. Hence a novel method called: “Twitter Trend Momentum (TTM)” is introduced for trend prediction which is the enhancement of a well-known stock market indicator called moving average convergence divergence (MACD). Reason analysis for trend variation is also carried out as an extension to the authors' research work. An evaluation of the framework showed the best results which are applied to build a real-time web application called “TwitTrend.” The application acts as a real-time update and recommendation system of top trends to users.
Measuring Severity of Attributes That Create Vulnerabilities in Websites and Software Applications Using Two Way Assessment Technique
Authors: Narang Swati , Kapur P.K. , Damodaran D.
Published: February 2019

Inadequacies and faults that are the reason of vulnerabilities are hazardous for the websites. The authors' chief intention is to trim down those assailon websites by restraining the attributes accountable for these assails. This article categorizes those cases/ attributes into 10 categories and arranges them inpriority according to their severity. These attributes influence which contributes to losses in terms of monetary as well as humanity. By prioritizing these attributes, web designers as well as users will check twice on these aspects before entering confidential information into the website. The opinion of different web designers and experts of different companies was captured to prioritize these attributes using an analytical hierarchical process and two way assessment methods so that the loss should be minimized. Research confirms that total severity measure aids the severities of these attribute's contribution towards vulnerabilities. The findings of the two way assessment technique show that there is only one such attribute which happens to be extremely severe in comparison to other attributes and needs imperative consideration while designing websites and also by users before entering their confidential credentials on a website to curtail the losses caused by black hat guys.
Analysis and Comparison of Neural Network Models for Software Development Effort Estimation
Authors: Dutta Kamlesh , Gupta Varun , Dave Vachik S.
Published: February 2019

Prediction of software development is the key task for the effective management of any software industry. The accuracy and reliability of the prediction mechanisms used for the estimation of software development effort is also important. A series of experiments are conducted to gradually progress towards the improved accurate estimation of the software development effort. However, while conducting these experiments, it was found that the size of the training set was not sufficient to train a large and complex artificial neural network (ANN). To overcome the problem of the size of the available training data set, a novel multilayered architecture based on a neural network model is proposed. The accuracy of the proposed multi-layered model is assessed using different criteria, which proves the pre-eminence of the proposed model.
PEST Embedded SWOT Analysis on China's E-Commerce Industry Development Strategy
Authors: Zhao Jingkun , Liu Honglu , Xue Wanxin
Published: February 2019

This article investigates how e-commerce industry in China can achieve high levels of development under such circumstances. In order to better explore the development strategies of China's e-commerce industry, researchers have already introduced PEST analysis or SWOT analysis, however past studies concentrated exclusively on the main ‘net effects' of these analysis. Because of the complex reality in which the phenomena of e-commerce industry, PEST embedded SWOT analysis can provide a more accurate understanding of how e-commerce industry in China can maintain the healthy and stable development. Applying this theory, the article seeks to determine all the possible factors that build strong development of e-commerce industry in China. To address the question of this research, the study employs PEST embedded SWOT analysis which proposes industry analysis framework of the development strategy of China's e-commerce industry. Future research can consider other possible combinations and explore how the impact of these factors on development strategy of China's e-commerce industry.
The Impacts of User Experience on User Loyalty Based on O2O Innovation Platform
Authors: Pei Yilei , Xue Wanxin , Yang Yong , Li Dandan , Li Yi
Published: February 2019

In the age of the experience economy, the rapid development of O2O platform makes the study on user experience become important. Based on technology acceptance model (TAM), this article discusses user loyalty from the perspective of user experience; introduces user satisfaction; develops the structure model of relationships between user experience and user loyalty based on O2O innovation platform; uses structural equation model (SEM) and verifies the theoretical hypothesis through the questionnaire of 201 O2O platform users. The study finds that the usefulness and ease of use of O2O platform interact with each other, the usefulness and ease of use of O2O platform have a significant positive impact on user experience. This in turn leads to the user experience of O2O platform has a significant positive impact on user satisfaction, and user satisfaction of the O2O platform has a significant positive impact on user loyalty. The conclusions reveal the effect mechanism between user experience and user loyalty based on O2O innovation platform.
Study on the Influencing Factors of Mobile Users' Impulse Purchase Behavior in a Large Online Promotion Activity
Authors: Liu Qihua , Zhang Fuguo
Published: February 2019

A large online promotion activity provides a new shopping context for mobile users where situational variables impact consumer behaviors simultaneously. A multitude of evidences show that mobile users are more prone to impulsive in the large online promotion activity, yet relatively limited knowledge is available on this phenomenon. The purpose of this article is to answer the question of what are the important contextual drivers that lead to occurrence of mobile users' impulse purchase behavior in the “Double 11” promotion. The results show that promotion, impulse buying tendency, social environment, aesthetics and interactivity of mobile platforms, and time available are key determinants of mobile users' urge to buy impulsively. Implications for managers and scholars are further discussed.
RC Polyphase Filter as Complex Analog Hilbert Filter
Authors: Tamura Yoshiro , Sekiyama Ryo , Sasaki Shu , Asami Koji , Kobayashi Haruo
Published: February 2019

This paper presents that the RC polyphase filer has characteristics as a complex analog Hilbert filter. Phase characteristics of the RC polyphase filter have the same as the Hilbert filter. Also its gain characteristics can be approximated as the Hilbert filter; as its order becomes higher, its gain characteristics become closer to the Hilbert filter. We have proved these for 1st to 4th RC polyphase filters, as well as in general n-th order case, and also confirmed with numerical simulations.
Rehabilitation Assistance Using Motion Capture Devices and Virtual Reality Feedback
Authors: Yuminaka Yasushi , Fujii Motoaki , Manabe Atsuhi , Hasegawa Makoto , Wada Naoki
Published: February 2019

Physical rehabilitation is required to support functional therapy in patients with restricted function in their body caused by cerebral, spinal, or muscular disorders. We sought to investigate the feasibility of medical and healthcare applications of the Kinect v2 motion capture devices and a head mount display in response to practical medical needs, including: (1) a Timed Up and Go test, and a walking rehabilitation support system; and (2) rehabilitation assistance using virtual reality feedback. The prototype systems demonstrate that the ICT-based rehabilitation equipment offers the objective and effective assessment of physical deficits in patients with conditions such as stroke or Parkinson's disease.
Determination of Phase Shift by Digital Holography
Authors: Takahashi Yoshitaka , Saito Masatoshi , Nakajima Toru , Shingu Masakazu
Published: February 2019

In phase shifting interferometry phase shift is applied by various ways, but applying it with high accuracy, especially by LD current modulation, is not easy. In order to determine the accurate phase shift a new method has been proposed that the value of LD current corresponding to π/2 phase shift can be determined by phase shifting digital holography. The measured data of standard in surface shape measurement were used for calibration, and the obtained value was confirmed to cause noise reduction and improvement of holographic reconstructed images in digital holography.
Multi-Valued PAM-N Data Transmission Using Double-Rate Tomlinson-Harashima Precoding
Authors: Iijima Yosuke , Yuminaka Yasushi
Published: February 2019

This paper presents an evaluation of double-rate Tomlinson-Harashima precoding in multi-valued PAM-N data transmission. In order to eliminate an intersymbol interference of interconnections in VLS system, Tomlinson-Harashima precoding (THP) is very useful for limiting the peak and average power of the transmitter. To expand the eye-opening at a receiver in multi-valued data transmission, we proposed a new equalization technique by using double-rate THP. In this paper, to evaluate the performance of the double-rate THP, we show the simulation results of the double-rate THP in various PAM-N data transmission on a micro-strip line.
Modern Building Materials Using Waste from the Dismantling of Buildings and Structures
Authors: Maslennikova L.L. , Babak N.A. , Naginskii I.A.
Published: February 2019

In this article the possibility of using construction waste (including waste of dismantling of buildings) when receiving building ceramics, heat-resistant materials based on liquid glass and materials based on natural hardening cement binder is considered. The purpose of study was development of building materials compositions made with using of secondary crushed stone screening HYPERLINK "https://www.multitran.ru/c/m.exe?t=2400068_1_2&s1=%EE%F2%F1%E5%E2" of dismantling of buildings for various purposes, which would suit all state standards. Also these materials would have some improved physical-mechanical characteristics and would be more eco-friendly. Optimum compositions of materials made with use of building mineral waste and physical-mechanical characteristics of received materials are given. For research of waste structure and synthesizable materials structure X-ray phase, differential-thermal methods of analysis and grain size measurements were used. The geological-ecological evaluation of secondary crushed stone screening use efficiency in developed technologies is given.
Experimental Study of Fiber-Reinforced Concrete Structures
Authors: Klyuev Sergey V. , Khezhev T.A. , Pukharenko Yu.V. , Klyuev A.V.
Published: February 2019

Acute questions of steelfiber using for disperse-reinforced fine-grained concrete are considered in the article. Researchers of steelfiber concrete patterns are held. The efficiency of using crushing dropout of quartzitic sandstone is proven. The article studies the physical and mechanical characteristics of the filler. The chemical composition of the binder is presented. For dispersed reinforcement of fine concrete the influence of steel fibre on the strength characteristics of the mixture was studied. The characteristics of the fiber and the technology of obtaining a fiber-concrete mixture are presented. Studies showed the effectiveness of steel fibre with a percentage of 3% and a cement-sand ratio of 1/3.
Influence of Variable Stress State of Concrete on its Frost Resistance
Authors: Karpenko N.I. , Yarmakovsky V.N. , Kadiev D.Z.
Published: February 2019

Test results of concrete under the conditions of simultaneous action of multiply repeated loads of axial compression and cyclic freezing at different temperatures are given. It is established that such variable stress state of concrete under the condition σmax<R0T (where σmax is the maximum stress of the loading cycle and R0T is the stress level determining the lower boundary of the microcrack formation region of concrete) can increase its frost resistance. This is only true if the degree of water saturation of gel pores and pore capillaries of concrete does not exceed a critical value – more than 90% by volume. The results of the investigations of the structural and technological characteristics of concrete (water-cement ratio, moisture content, differential porosity, ice content, determined by calorimetric and ultrasonic methods), frozen to temperatures down to minus 70 °C, confirm the validity of the conclusions about the effect of the variable stressed state of concrete on its frost resistance.
Interaction of Mixing Water with Superlasticizers and Hyperplasticizers Additives in Concrete Mixture
Authors: Vernigorova V.N. , Sadenko S.M.
Published: February 2019

The article deals with the mechanism of interaction of super-plasticizers and hyper-plasticizers additives with mixing water, the formation of micelles and organized water. The interaction of mixing water and additives with Portland cement particles, surface tension, specific surface of bindings and their significance in setting and hardening processes are considered. It is shown that a local effect plays a decisive role in micro-heterogeneous organized media associated with the dissolution of hydrophilic and hydrophobic molecules in the volume of the micellar system or the receptor molecule cavity. In this case, the change of dissolved substances properties is due to the change of the medium state only in the microenvironment, and not in the whole solvent - water. The surface energy of the dispersed material and the degree of dispersion are very important for the concrete technology. All dispersed materials of the system are unstable. The aggregation of powder particles of building materials spontaneously takes place in highly dispersed powders and if such powders get pressure, it is possible to get a hard and strong material without water and additives.
Investigation of the Structural Topological Characteristics of Mechanically Activated Sialic Raw Materials
Authors: Nelyubova Victoriya V. , Strokova Valeria V. , Popov A.L. , Bezdrodnykh A.A.
Published: February 2019

This work presents the results of investigations of the topological characteristics of quartz raw materials of various mineral compositions crushed to the critical state of the dispersed layer under which the shape of the particles and the action of the electrostatic repulsion forces change.
Modification of Foam Concrete with Organo-Mineral Admixtures
Authors: Velichko E. , Pustylnik O.
Published: February 2019

A multi-level optimization of size-consist of foam concrete is considered with the aim of significantly increasing its construction and mechanical properties. The results of theoretical and experimental studies confirming the expediency of using this process technology are given. In the course of the studies, theoretical and experimental conditions for creating balanced size-consist of non-autoclaved modified foam concrete with an increased solids concentration per volume unit and performance properties with complex organo-mineral admixture of sustained action on the basis of balanced ratio of chemical and finely-dispersed mineral ingredients optimizing its size-consist and structure were developed. The use of microsilicasuspension in foam composition is theoretically justified, and in the composition of foam-concrete mix of finely-dispersed slag and complex chemical modifier with an accelerating agent, that provide an increase in the strength of non-autoclaved foam concrete by more than 2 times, a decrease in thermal conductivity by 25%, shrinkage – by more than 4 times.
On the Question of Mix Composition Selection for Construction 3D Printing
Authors: Elistratkin M.Y. , Lesovik Valery S. , Alfimova N.I. , Shurakov I.M.
Published: February 2019

Due to its novelty, futuristic appearance of created forms, a vivid contrast with a conventional image of a construction site, construction 3D printing attracts attention of a wide audience. Specialists see it as affording significant possibilities for saving all kinds of resources, reducing construction time, giving possibility to implement progressive design solutions, but they also see serious problems, such as: an immature general concept of development of additive technologies, a limited range and high cost of consumables, lack of methods for development of new compositions and lack of experience in application of such methods as a result. The paper analyzes links between the process factors and properties of molding components; principles of their practical implementation are proposed. Special attention is given to the issues in assessment of construction printability of newly-developed compositions.
Optimization of Temperatures of Hashing Asphaltic Concrete Mixes Taking into Account the Structural Type of Bitumen
Authors: Galdina V.D. , Galdin N.S.
Published: February 2019

Researches by definition of optimum temperatures at hashing asphaltic concrete mixes on bitumens of different structural types with application of a method of mathematical designing of experiments are presented. Varied factors at manufacturing asphaltic concrete mixes were an index of a penetration of bitumen as the characteristic of a structural type of bitumen, the maintenance of bitumen and temperature of hashing of mixes. Processing of results of experiment is executed with application of computer technologies by means of a package of applied programs Maple. Mathematical models of physicomechanical properties of asphaltic concretes in the form of the equations the regressions reflective link between investigated properties of asphaltic concretes and varied factors are received. It is determined that at reduction of an index of a penetration and a rise of temperature of mixing strength of an asphaltic concrete increases. At a rise of temperature of hashing and increas asphalt content in mixes the water-resistance of an asphaltic concrete increases. On extreme dependences of indicators of durability at a tensioning and a tension in bending from hashing temperature optimum temperatures of hashing asphaltic concrete mixes are defined. It is established that optimum temperatures of hashing depends on an index of a penetration of bitumen and raise at its reduction.
Properties of Composite Gypsum Binders Depending on Multicomponent Mineral Additives
Authors: Lesovik Valery S. , Chernysheva N.V. , Drebezgova M.Yu.
Published: February 2019

This article considers the possibility of increasing the effectiveness of composite gypsum binders (CGB) by controlling the processes of structure formation as a result of using new types of multicomponent mineral additives that are significantly different from the traditionally used quartz raw materials:- waste of wet magnetic separation of ferrous quartzites (WMS waste,) of polymineral composition with quartzy of varying degrees of crystallinity, nanodispersed silica and chalk powder. We have studied the cause-effect relationship between the change in the ratio of binding and mineral additives of various compositions, which determines the conditions for the formation of technological and strength characteristics of the projected composite materials with specified performance properties. We have established the presence of regularities in the changes in the properties of CGB, the composition of the hardening products and the microstructure depending on the type and content of gypsum binders of β-and α-modifications, portland cement, multicomponent finely-dispersed mineral additives, the regularity consists in the binding of portlandite, which is released upon portland cement hydration, by the amorphous phase of earth siliconas a part ofnanodispersed powder and chalcedony variety of quartz waste of wet magnetic separation of ferruginous quartzites. This provides a reduction in the basicity of the solidifying system, the intensification of crystal formation, and the formation of newgrowths with a high content of tobormorite-low-basic calcium hydrosilicates that compact the microstructure of the hardening matrix and, as a result, increase the water resistance and stability. It is noted that this mechanism of hydration of CGB minimizes inner stresses and volume deformations, therefore the number of microcracks decreases, which leads to an increase in its efficiency in comparison with the traditionally used gypsum binder and that differs from the traditional portland cement by a fast strength generation.
Atomic Force Microscopic Research of Structural Features of Elastomeric Composite Materials Based on Butadiene Nitrile Rubber
Authors: Shadrinov N.V.
Published: February 2019

The influence of hollow corundum microspheres on mechanical properties and wear resistance of nitrile butadiene rubber (NBR) with the lowest quantity of acrylonitrile (17-19%) have been studied. Results show that the abrasion resistance increased with increase in filler loadings at the two particle sizes investigated. Research of mechanical properties showed that strength at break decreased, while relative elongation at break increased with increase in microspheres loadings. Atomic force microscopy (AFM) was used to perform high-resolution imaging of surfaces of NBR composites. Microspheres exfoliation from NBR matrix at uniaxial stretching was studied with the use of special device compatible with AFM. The obtained AFM images demonstrate stretched fibrils bonded to the surface of microspheres.
Determination of Fiber-Structure for the Effective Reinforcement of Planar Composite-Material Constructions
Authors: Feodorova N.
Published: February 2019

To describe the behaviour of a composite material reinforced by fibers along curvilinear trajectories, a resolving system of differential equations has been obtained. I developed a structural model within the framework of the two-dimensional non-uniform linear elasticity problem. The reinforcement is performed on the basis of three approaches: according to the grid lines of the orthogonal coordinate system determined by the given conformal representation; according to trajectories isogonal to the given curves; according to the helical trajectories in the axisymmetric formulation of the problem. Particular solutions of the corresponding boundary problems have been obtained. Recommendations for the effective reinforcement of planar constructions have been presented.
Bioactive Additives for Self-Healing of Concretete Microstructure
Authors: Bruyako Michail , Grigoryeva L.
Published: February 2019

As a result of the influence of the corrosive environment, the construction materials have a decrease in performance. To increase the service life of the structures, continuous monitoring and, if necessary, restorative repairs are carried out. One of the ways to maintain the initial properties for materials is to give them a self-healing effect by introducing a specially developed additive containing a bioactive component in the manufacturing process. The article presents the results of research on the ability of building materials based on mineral binders to self-repair. Mixtures containing nutrient medium for the biomass of aerobic bacteria were used as bioadditives. Portland cement and gypsum binder were used as mineral binders. The obtained results allow to make a conclusion about a significant change in the rheological properties of cement-sand mortars due to the presence of biological surface-active substances that are part of the cells of microorganisms. The effect of changing the concentration of cells on the setting time and on the strength characteristics of cement-sand mortars was established.
Welding Polymer Pipes at Low Climatic Temperatures
Authors: Starostin N.P. , Gerasimov A.I. , Danzanova E.V. , Botvin G.V.
Published: February 2019

The results of the research on development of technology for welding polymer pipes at low climatic temperatures in open air without the use of temporary heated structures are presented. The most common welding methods are considered: butt welding with a heated tool, electrofusion welding with embedded heating element and socket welding. Tests on welded joints show that the developed technology for welding in open air without the construction of shelters provides the same level of quality as when welding at admissible temperatures.
Electroconducting Nanocomposite of Polyaniline on Based of the Natural Layered Silicate
Authors: Shapkin N.P. , Khalchenko I.G. , Razov V.I. , Korochentsev Vladimir V.
Published: February 2019

An electrically conducting polyaniline doped with ferricyanic acid was synthesized by oxidative polymerization of the aniline salt of ferrocyanic acid. Composites based on acidic-modified natural vermiculite, phenylenediamine, and polyaniline doped with ferricyanic acid have been fabricated using the method of molecular layering. The composites structures were studied by the method of X-ray diffraction analysis, while their electroconductivity – by means of impedance spectroscopy.