bluuebunny/crossref_metadata_2025_split huggingface dataset:
RETRACTED: Mechanical and Acoustical Properties of Short Oil Palm Frond Fibre Reinforced Polyester Composites
Authors: Sabri  , Fuadi Zahrul , Kurniawan Rudi , Rizal Samsul 
Published: February 2021

Abstract
This paper presents the determination of tensile, flexural, and acoustical properties of short oil palm frond (OPF) fibre reinforced polyester composites and issues that have to be controlled in order to improve those properties. Three composite samples were fabricated using fibre content of 5%, 10% and 15% (by mass fraction) each. The tensile strength and elastic modulus of the composites were determined by tensile test conforming to the ASTM D638 standard and the flexural strength was measured by the three-point bending test method in accordance to ASTM D790 standard whereas the acoustical properties were determined by transfer function method conforming to the ISO 10534-2 standard. It is showed that the OPF-polyester composites possess greater tensile strength and flexural strength at lower fibre content while the elastic modulus registered increment with higher fibre loadings. Reduction in tensile and flexural strengths at higher fibre content is caused by poor stress transfer mechanism as the combined effect of inadequate fibre/matrix interface adhesion and stress concentration spots. Fibre agglomeration, which causes hindrance to the polyester macromolecule chain mobility, is accounted for the increment in stiffness properties as the amount of fibre is increased. From the measurement of the acoustical properties shows that the sound absorption coefficient is a function of incidence frequency. The normal incidence sound absorption coefficients for different frequencies tend to increase with increasing frequency operation. There is an excellent agreement between the absorption coefficient and the input frequency.
Review and comparative analysis of computational algorithms for modeling the dynamics of elastically supported structural systems
Authors: Skalko Yu I , Gridnev S Yu 
Published: February 2021

Abstract
The work is devoted to the comparative analysis of computational algorithms for modeling the dynamics of elastically supported structural systems with intermediate and limiting supports in the presence of point forces applied to the superstructure. The considered algorithms are based on the model formulation in the form of a system of partial differential equations for generalized functions. This approach avoids the need to subordinate the basic functions to the boundary conditions and include the presence of sources of the forces, applied at a certain point, in the model.
Buckling of compressed rods taking into account their own weight under different boundary conditions
Authors: Chepurnenko A S , Yazyev S B , Vysokovskiy D.A , Verzhbovskiy G B 
Published: February 2021

Abstract
The article is devoted to the problem of calculating the stability of compressed rods taking into account their own weight. The fourth order resolving differential equation with respect to dimensionless deflection was obtained. A technique for the numerical solution of the resulting equation is proposed using finite differences method. As a result, the problem was reduced to a generalized eigenvalue problem. Comparison with the solution of other authors is given.
Updating the architectural heritage of the Krasnodar Territory, in the context of its preservation and restoration
Authors: Subbotin O S 
Published: February 2021

Abstract
The priority for the preservation and restoration of objects of architectural heritage, which are an important historical and cultural potential of the Kuban is indicated. It was noted that this potential has actual effectiveness and allows it to be realized in the strategic development of the region. The expediency of applying the preservation mechanism for the objects of architectural heritage for the investors and non-budgetary organizations wishing to rent premises in these objects is recommended. An assessment of the economic significance of this mechanism implementation is given. The necessary measures are identified, in the context of “smart space” to carry out appropriate work to create the historical environment comfort, in terms of the innovative technologies‘ application.
Strength and deformation of bending normal sections made of concrete frame structure
Authors: Mailyan D R , Nesvetaev G V , Koryanova Yu I , Lesniak E V 
Published: February 2021

Abstract
Concrete of the frame structure, obtained by the separate concreting technology by immersing a coarse aggregate in a low-viscosity mortar component due to increased concentration of coarse aggregate, have a number of advantages in comparison with the traditional concretes of vibration compaction.
Analytical optimization of the dispersion-reinforced fine-grained concrete composition
Authors: Zhukov A D , Bessonov I V , Bekele A D , E A Zinoveva E A 
Published: February 2021

Abstract
The article presents the results of studying the problem of the concrete scrap accumulation and disposal. It is noted that after the implementation of comprehensive programs, including the renovation and modernization of the housing stock, a significant amount of concrete scrap has already been accumulated, and its amount will only increase. The results of scientific research on the compositions development of composite binder and fine-grained dispersed reinforced concrete based on this binder are presented. The purpose of the research described in the article was to develop the elements of a methodology for selecting the dispersed reinforced composite material composition based on finely ground waste of concrete scrap, mineral binder, thin basalt fiber and superplasticizers. The goal was solved using the methodology of technological processes system analysis and, in particular, mathematical planning, processing the experimental results and applying the analytical optimization method. It is noted that fine grinding of mineral components and the use of fibers with a diameter of 0.1 … 6 microns allows not only to modify the concrete structure with an increase in strength characteristics, but also changes the chemical and physicochemical processes‘ nature on the contact surfaces of the mineral matrix and fiber, as well as the same binder and finely ground reactive mineral particles with the formation of microsystems qualified as nanostructures.
Calculation of a beam with external reinforcement. Contact layer model
Authors: Tsybin N Yu , Andreev V I , Turusov R A 
Published: February 2021

Abstract
The article is devoted to the stress-strain state study of the beam, with external reinforcement in the tensile zone. The classical Euler-Bernoulli hypotheses are used for the beam. The interaction of the beam with the reinforcement layer is carried out using the contact layer. In order to simplify the previously obtained solution, the flexural stiffness of the reinforcement layer is not taken into account. As a result, the solution of the resolving equations system for this model has been obtained. It is shown that the obtained solution allows satisfying all boundary conditions, including the equality to zero of the shear stresses at the corner points. The influence of various mechanical and geometric parameters on the stress-strain state of the beam, the reinforcement layer and the contact layer is analyzed. The influence of the introduced simplifications on the solution results is analyzed.
A non-standard mark‘s center recognition correctness by a 3D laser scanner
Authors: Gura D A , Shevchenko G G , Dyakova N A , Pshidatok S K 
Published: February 2021

Abstract
Terrestrial laser scanners have sophisticated specialized software that makes it possible to measure three-dimensional coordinates of a huge number of points in a short period by registering vertical and horizontal angles. To determine the spatial position of the scanner and the coverage of the area of interest on one scan, special marks are placed around the scanner. These marks are used for further high-precision scan matching. The problem of the process of recognizing the center of black and white marks during field shooting, as separate from the scanning process itself, is a separate task, which has not been sufficiently studied. The purpose of the experiment is to establish the correctness dependence of the mark center recognition on its various characteristics. The technique is the experimental component and theoretical analysis of the obtained material. The experiment was carried out under the same conditions, so that the influence of the distance from the device to the mark, a change in the angle between the laser beam and the mark plane could not affect the recognition correctness of the mark center. In the course of the experiment, 8 marks were prepared with a non-standard view and size, as well as one standard black and white mark, to check the reliability of the data obtained (diameter 74.1 mm, two opposite sectors are black, and the other two are white). This experiment showed that the process of recognizing the mark center depends on the combination of the following characteristics: mark geometry, mark color, the opposite sectors of the mark.
Geodesic provision for cadastral works: development prospects
Authors: Gura D A , Nedyakina A P 
Published: February 2021

Abstract
The article analyzes the geodesic provision development when performing a cadastral survey. It has been established that improvement will be manifested in the use of modern geodetic technologies - three-dimensional laser scanning. The analysis of literary sources showed that there is a significant number of scientific works on the use of laser scanning for obtaining cadastral data and creating a three-dimensional cadaster. Methods for performing cadastral surveys, criteria for choosing a measuring instrument, methods for assessing the accuracy of coordinates, algorithms for processing the scan data, building models have been developed. However, the issues of further use of three-dimensional information for the cadastral documentation preparation are practically not covered, while the cadastral documentation is the basis for introducing the information into the real estate cadaster. The article presents the results of performing the ground-based laser scanning of a linear object. Additional information that can be introduced to the real estate cadaster in connection with the use of three-dimensional technology - height, technical condition of a linear object has been established. The sections of the technical plan and the changes made to them have been given. In addition, it was revealed that when using three-dimensional data in the preparation of technical plans, it would be inevitable to develop the software that can create boundary, technical plans based on three-dimensional data.
Opportunities for the drinking water resources‘ export-oriented commercialization as a potential element of the economic framework in mountainous areas
Authors: Kalov R O , Kiloev D D , Elmurzaev R S 
Published: February 2021

Abstract
The predicted reserves of fresh groundwater in the Kabardino-Balkarian Republic (KBR) reach 7200 thousand m3/day, which is 31.2% of similar resources in the North Caucasus Federal District, ranking first in the region. In terms of mineralization in general, groundwater in the KBR belongs to the class of “fresh groundwater” in terms of chemical composition they are classified as “drinking” in terms of total hardness - to “moderately hard water”. Water does not contain significant concentrations of heavy metals and inorganic nitrogen compounds. However, the use of the indicated potential is limited only to the creation of local lines for bottling water with a small capacity, mainly focused on the republican and regional markets of Russia. The purpose of this study is to substantiate the hypothesis about the sufficient resources‘ availability of hydrogeological materials suitable for industrial production and bottling as ecologically clean drinking water. Within the framework of the designated goal, the following tasks were solved: - search for mountain landscapes, in the first approximation localizing the balance reserves of fresh groundwater; - environmental monitoring of the sites previously designated as favorable for the drinking water extraction; - the productive aquifers‘ assessment nature and the conditions of their natural protection from pollution; - identification of natural components that maintain the balance of groundwater and factors of its change over time; - establishing the specifics of groundwater discharge and the dynamics of regime-forming processes in the vertical zoning conditions in the study area.
Rating assessment of an urbanized area for insurance purposes
Authors: Zaalishvili V B 
Published: February 2021

Abstract
A rating assessment of the engineering-geological and geomorphological features of the territory has been carried out in the work. An area of 5 km x 4 km was allocated on the territory of Tbilisi. The area was divided into the squares with the size 100x100m. The minimum size of the plots was determined by the maps scale 1: 10,000. On the basis of these maps, each plot was assigned a rating according to the appropriate factor (soil type, layer thickness, groundwater level, relief, hazardous geological processes - landslide, avalanche, rockfall). Each factor was assigned a corresponding rating index (0-4). The best sites had the lowest index. Final maps of individual site ratings were compiled for various factors (soil type, thickness, etc.). On their basis, a summary rating map has been drawn up. All maps were made in GIS technology. The paper shows that the influence of these conditions can be significant in the absence of seismic impact. The results of the work can serve as a basis for assessments of any level, including for assessing seismic risk, as well as for insurance of buildings and structures located in the relevant territories.
Management of organizational and technological design in construction based on information modeling (BIM-technologies)
Authors: Gushchina Yu V , Nikolaev Yu N , Chernikov A A 
Published: February 2021

Abstract
The article discusses the modern application aspects of information modeling technologies for buildings and structures (BIM-technologies) in the construction projects’ management. The introduction of information modeling technologies into the investment and construction project management process will allow not only using automated tools for performing various types of analysis and verification, visual planning and optimization of the construction process, but also provide regulated access to the object data to all interested parties in a single information environment.
The microstructure and mechanical properties of Mg-Gd-Y-Zn-Zr system and Mg-Gd-Y-Zr system alloys by RUE deformation
Authors: Jia Leichen , Yu Jianmin , Xu Wenlong , Wu Guoqin , Xia Qing , Zhang Zhimin 
Published: February 2021

Abstract
This study investigates the effects of long-period stacking order (LPSO) phases on the dynamic recrystallization (DRX) process. By comparing Mg-Gd-Y-Zn-Zr (GWZ) alloy and Mg-Gd-Y-Zr (GW) alloy deformed by 4 passes of Isothermal Reciprocating Upsetting-Extrusion (RUE), the initial alloy grain sizes are 113.4 μm and 88.2 μm, respectively, after 4 passes, the grain size becomes 3.5 μm and 4.8 μm, and the grain refinement of GWZ is greater. After 1 pass, the DRX volume fraction of GWZ alloy is 83% and 15%, which is related to the LPSO phases contained in the GWZ alloy. The texture strength of the GWZ alloy ranges from 8.5 of 1 pass to 2.2 of 4 passes, while the GW alloy is from 5.9 of 1 pass to 2.8 of 4 passes, mainly due to the DRX grain volume fraction. The tensile test results at room temperature (RT) showed that the ultimate tensile strength (UTS) and tensile yield strength (TYS) of GWZ alloy are higher than that of GW alloy, and the elongation is lower than that of GW alloy.
Large area deposition of Janus MoS2x
Se2(x−1) on paper as a multifunctional electromechanical sensor for versatile physiological signal monitoring
Authors: Bokka Naveen , Ganeshan Sankalp Koduvayur , Sahatiya Parikshit 
Published: February 2021

Abstract
The recent advancements in smart materials, processing techniques, and sensing technology have pervasive to the development of the modern era of flexible electronic systems. Flexible pressure and strain sensors with multi-functional sensing capabilities have gained significant interest as they have potential applications in human motion detection, physiological signal monitoring, flexible robotics, electronic skin, and smart displays. Hence this puts forward a higher requirement to develop highly sensitive, low cost and high-performance electromechanical sensors. Herein, we demonstrate the fabrication of solution-processed MoSSe/paper-based flexible Pressure and strain sensor with PDMS encapsulation using facile hydrothermal and vacuum filtration method with merits of low cost, large-area deposition, high scalability, and superior sensing performance. The fabricated device exhibited a very high sensitivity of 108.09 kPa−1 and a gauge factor of 27.57 with good reproducibility, stability, and resilience for 1200 bending cycles which indicates the robustness of the device. The enhanced sensing efficiency can be accounted for the excellent piezoelectric property and the pressure, strain-induced bandgap modulation observed in Janus MoSSe which arises due to the loss of symmetry in the crystal lattice. The sensors were utilized for real-time applications for the detection of various human physiological signals by integrating them into body parts, breath sensing, handwriting recognition, unknown shape detection, and pressure mapping. This successful demonstration of high performance, low cost, and large area deposited paper-based pressure and strain sensors, opens up new opportunities for far-reaching applications in health care, security, smart systems, and robotics.
Above- and below-ground resource acquisition strategies determine plant species responses to nitrogen enrichment
Authors: Zhang Dianye , Peng Yunfeng , Li Fei , Yang Guibiao , Wang Jun , Yu Jianchun , Zhou Guoying , Yang Yuanhe 
Published: February 2021

Abstract

Background and Aims
Knowledge of plant resource acquisition strategies is crucial for understanding the mechanisms mediating the responses of ecosystems to external nitrogen (N) input. However, few studies have considered the joint effects of above-ground (light) and below-ground (nutrient) resource acquisition strategies in regulating plant species responses to N enrichment. Here, we quantified the effects of light and non-N nutrient acquisition capacities on species relative abundance in the case of extra N input.

Methods
Based on an N-manipulation experiment in a Tibetan alpine steppe, we determined the responses of species relative abundances and light and nutrient acquisition capacities to N enrichment for two species with different resource acquisition strategies (the taller Stipa purpurea, which is colonized by arbuscular mycorrhizal fungi, and the shorter Carex stenophylloides, which has cluster roots). Structural equation models were developed to explore the relative effects of light and nutrient acquisition on species relative abundance along the N addition gradient.

Key Results
We found that the relative abundance of taller S. purpurea increased with the improved light acquisition along the N addition gradient. In contrast, the shorter C. stenophylloides, with cluster roots, excelled in acquiring phosphorus (P) so as to elevate its leaf P concentration under N enrichment by producing large amounts of carboxylate exudates that mobilized moderately labile and recalcitrant soil P forms. The increased leaf P concentration of C. stenophylloides enhanced its light use efficiency and promoted its relative abundance even in the shade of taller competitors.

Conclusions
Our findings highlight that the combined effects of above-ground (light) and below-ground (nutrient) resources rather than light alone (the prevailing perspective) determine the responses of grassland community structure to N enrichment.
A systematic review of computational methods for predicting long noncoding RNAs
Authors: Xu Xinran , Liu Shuai , Yang Zhihao , Zhao Xiaohan , Deng Yaozhen , Zhang Guangzhan , Pang Jian , Zhao Chengshuai , Zhang Wen 
Published: February 2021

AbstractAccurately and rapidly distinguishing long noncoding RNAs (lncRNAs) from transcripts is prerequisite for exploring their biological functions. In recent years, many computational methods have been developed to predict lncRNAs from transcripts, but there is no systematic review on these computational methods. In this review, we introduce databases and features involved in the development of computational prediction models, and subsequently summarize existing state-of-the-art computational methods, including methods based on binary classifiers, deep learning and ensemble learning. However, a user-friendly way of employing existing state-of-the-art computational methods is in demand. Therefore, we develop a Python package ezLncPred, which provides a pragmatic command line implementation to utilize nine state-of-the-art lncRNA prediction methods. Finally, we discuss challenges of lncRNA prediction and future directions.
d-PBWT: dynamic positional Burrows–Wheeler transform
Authors: Sanaullah Ahsan , Zhi Degui , Zhang Shaojie 
Published: February 2021

Abstract

Motivation
Durbin’s positional Burrows–Wheeler transform (PBWT) is a scalable data structure for haplotype matching. It has been successfully applied to identical by descent (IBD) segment identification and genotype imputation. Once the PBWT of a haplotype panel is constructed, it supports efficient retrieval of all shared long segments among all individuals (long matches) and efficient query between an external haplotype and the panel. However, the standard PBWT is an array-based static data structure and does not support dynamic updates of the panel.

Results
Here, we generalize the static PBWT to a dynamic data structure, d-PBWT, where the reverse prefix sorting at each position is stored with linked lists. We also developed efficient algorithms for insertion and deletion of individual haplotypes. In addition, we verified that d-PBWT can support all algorithms of PBWT. In doing so, we systematically investigated variations of set maximal match and long match query algorithms: while they all have average case time complexity independent of database size, they have different worst case complexities and dependencies on additional data structures.

Availabilityand implementation
The benchmarking code is available at genome.ucf.edu/d-PBWT.

Supplementary information
Supplementary data are available at Bioinformatics online.
Risk and uncertainty can be analyzed in cyberspace
Authors: Brantly Aaron F 
Published: February 2021

AbstractPerceptions of risk and uncertainty are pervasive in all international interactions. How states perceive risk and uncertainty and how they respond to these conditions impacts their policies and diplomatic behaviors. Despite a robust literature encompassing of risk and uncertainty within conventional state to state interactions including conflict, state interactions in cyberspace have received less attention. How states perceive and interpret risk and uncertainty in cyberspace varies widely by state. Very often, these perceptions are mutually incompatible and lead to a sub-optimal status quo that fosters increased risk and uncertainty. While the prospects of uncontrolled escalation or worries about a “Cyber Pearl Harbor” might be hyperbole, the reality remains that for decision-makers within states assessing the conditions of and the actions undertaken in cyberspace at present foster instability and encourages risk-seeking behaviors. This work analyzes the formulation of state perceptions of risk and uncertainty and seeks to establish a heuristic within which risk and uncertainty can be analyzed.