bluuebunny/crossref_metadata_2025_split huggingface dataset:
Structure of a semisimple dihedral group algebra
Authors: Gradeva I , Epitropov Y 
Published: October 2019

Abstract
Let K be an arbitrary field, whose characteristic does not divide the order of the dihedral group D2m
of order 2m, where m is odd. In this paper we examine the structure of the semisimple dihedral group algebra KD2m
. For this purpose, we find a complete system of minimal central orthogonal idempotents of the group algebra. Through it we define the minimal components of KD2m
and its Wedderburn decomposition. The results we get are as general as possible, i.e. without requiring the field to be finite.
Numerical investigation of the granule size effect on the reaction product yield in a catalyst fixed bed
Authors: Solovev S A , Khusainov R R , Nasretdinova D R 
Published: October 2019

Abstract
The research work presents the results of mathematical modeling of the ethylbenzene dehydrogenation process to styrene in a fixed catalyst bed. Calculations for the different length granule packaging are carried out. Calculated values of the reaction product yield (styrene) are in a wide range of gas velocities. There are significant differences in the yield of the product at high gas velocities for catalyst granules of different shapes. Of the considered catalyst granules forms, we got the best yield efficiency by the use of granules, which provide maximum surface area and porosity in the fixed bed catalyst.
Indonesian contractor technological learning mechanism and its considerations
Authors: Kusuma B , Soemardi B W. , Pribadi K S , Yuliar S 
Published: October 2019

Abstract
The construction industry faces considerable challenges both in terms of rising construction capitalization and increasingly stringent consumer demand for project quality and costs. This challenge needs to be addressed appropriately by the contractor as an important actor who is directly in contact with the construction production process. Through mastery of technology, contractors are expected to overcome these challenges. The process of mastering technology is part of the contractor’s effort in improving its technological capabilities through technological learning. This study aims to obtain the latest information related to the mechanism carried out by contractors in the process of mastering technology and the considerations taken. This research was conducted through a survey on contractors whom operating in Indonesia. Respondents were given questions to choose the mechanism they used from 32 mechanisms that had been identified by previous researchers, which were grouped into 3 groups, import, internal, and collaboration. The results showed a difference between the contractor groups (all contractor, large contractor, and medium contractor). The mechanism that is commonly used is by introducing a formal Quality Management system; documenting and analyzing all data and information related to project acquisition and project implementation; and participating in technology exhibitions. The results of this study will become worthwhile information for the government in formulating policy to improve the performance of contractors and as a further part in the effort to map the pattern of technological capability development carried out by Indonesian contractors.
Financial and institutional scheme of aerotropolis conceptual design
Authors: Berawi M A , Affiandi Z N , Miraj P , Gunawan  
Published: October 2019

Abstract
The concept of aerotropolis expected to create an integrated transport, effective and efficient airport. It facilitates higher mobility and generates new economic center for regional development. Aerotropolis concept in Indonesia is facing some obstacles such as complex bureaucracy, inadequate infrastructure, and limited funding. This research aims to produce an alternative concept of aerotropolis by taking into account the project feasibility. The research will use life-cycle cost method and involved initial cost, operational, maintenance cost and revenue for project evaluation. The aerotropolis in Indonesia shall consist of the airport, industrial development, mixed-use and supporting infrastructure. The result shows that 15.81% of the internal rate of return might be obtained from this conceptual design. The study also formulates a suitable institutional scheme by considering the cost-sharing between public and private in the project life cycle.
Top Ten Similarity Ranking for Project Delay Factors in Construction Industry
Authors: Asmi Ade , Djamaris Aurino , Ihsan Mohammad 
Published: October 2019

Abstract
Delays that occur on a construction projects can cause project performance inefficiencies and can even add to the project cost. Factors due to project delays consist of many things that can cause project delays. This study aims to find a top ten similarity factor that causes delays in a construction projects based on the results of research in Jakarta construction projects against previous studies in other countries. From a total of 100 distributed questionnaires, 88 (88%) were filled in correctly and returned as data analysis material. The Data from the survey results were analyzed using Statistical Software Package (SPSS) to produce a ranking for Project Delay Factor. The ranking of the study was then re-analyzed based on the similarity of the previous research so that the similar Project Delay Factor Ranking was obtained.
Benefits and implications of the different types of quality management in the Malaysian construction industry
Authors: Mohammad Mazlina Zaira , Viana Marina , Raghib Ahmed Talal 
Published: October 2019

Abstract
The quality management system (QMS) is defined in terms of quality assurance, quality control, and quality planning. It is necessary for the construction field to confirm the projects will to be finished with success and without any obstacles for the best quality, explicit amount and at a minimum attainable value. The aim of this article is to produce a crucial and constructive analysis through a revision of five revealed works of literature that relate to QMS in the construction field based on Malaysian research setting. Relevant articles associated with the QMS in Malaysia has been studied. The main findings at those researches indicated that the satisfaction of the owner or the client, improved management and work capacity of the company, and facilitate the project management team to expeditiously manage the development activities for the project life cycle. More studies can use constant performance indicators at the project to check the efficacy of QMS in many samples to enhance the findings.
Predicting the service life of buildings and facilities to minimize the risk of losses in the conditions of natural and technogenic emergency situations
Authors: Smirnova Elena , Savin Sergey 
Published: October 2019

Abstract
This article discusses the solution to the task of predicting the consequences of catastrophic earthquakes for operational buildings and facilities. We suggest using such basic parameters for verifying the calculation models as natural frequencies, oscillation forms and decrements of objects under earthquake loads. At the same time we substantiate the possibility to use micro-oscillations for that purpose, even though buildings and facilities are cushioned systems. We present the methods and means to conduct tests to estimate the dynamic parameters of buildings, as well as an example of such a test and the process of verification of the calculation model in the example of a panel multi-storey building. We set an example of evaluation of the consequences of an accident with a building in St. Petersburg, which was partially destroyed as a result of non-uniform setting of soils in the base. We drew the conclusion that using dynamic parameters makes it possible to solve various tasks for current predicting the remaining service life of damaged objects.
Critical Criteria for Customer Satisfaction of Interior Design
Authors: Wang Pen-Kai , Perng Yeng-Horng 
Published: October 2019

Abstract
Because of the wide scope of interior design work, the satisfaction of interior design service customers is easily affected by perception differences. This study developed a set of indicators that can be used to evaluate interior-design-related customer satisfaction. Potential factors were first identified by conducting a literature review and in-depth interviews. The modified Delphi method was then employed to establish the analytic hierarchy process (AHP) framework. Lastly, the AHP method was used to identify the key indicators. The study results revealed 4 dimensions and 15 factors. The results of this study can serve as a reference for the interior design industry.
Scour and potential earthquake damage on bridges
Authors: Vidriales D F , Gómez R , Escobar J A 
Published: October 2019

Abstract
The vast majority of total and partial bridge collapses in México are due to scour damage. Bridges are not repaired promptly after a hurricane so the bridge is exposed to both, scour and earthquake hazard. This paper presents the results of a research project oriented to study the vulnerability-based hazard risk assessment of highway bridges subjected to extreme rainfalls due to hurricane events and its effect on bridge lateral strength. Scour hazard is computed using robust statistical procedures to minimise the intrinsic uncertainty of the extreme rainfalls. Earthquake hazard is computed accordingly to Mexican codes and well-known methodologies. A case study is used to present the methodology used in the research project, which was funded by the National Center for Disaster Prevention CENAPRED through the Institute of Engineering of the National Autonomous University of Mexico.
Measurement of the displacement response of a structure using line detection
Authors: Kim S W , Jeon B G , Park D U , Yun D W 
Published: October 2019

Abstract
The shaking table test is required to examine the seismic safety of a structure as well as the structure’s unique functions before and after the occurrence of an earthquake. That is, the data on the displacement responses obtained from the shaking table test are required to assess the seismic performance of a structure. In this study, the shaking table test was conducted to verify the validity of a method of measuring displacement responses using images. In this method, the lines of a structure were detected, and the responses were measured using the amount of change in the intersection of the detected lines. In addition, image filter processing was used to facilitate the detection of the lines of the structure in the shaking table test.
Evaluation on low temperature characteristics of SBS/CR modified asphalt binder under different aging conditions
Authors: Zhou Jie , Chen Xianhua , Xu Gang , Zhang Hanyu 
Published: October 2019

Abstract
This study discussed the low temperature performance of styrene–butadiene–styrene (SBS)/crumb rubber (CR) modified asphalt under different aging process. The bending beam rheometer (BBR) test was conducted to compare the low temperature performance of SBS and SBS/CR modified asphalt at three different temperatures. The continuous low service temperature of two modified asphalt binders was calculated based on the ASTM method. The simple fractional viscoelastic model was implemented to better describe the creep behaviour of asphalt at low temperatures from the BBR test results. The damping ratio and dissipated energy ratio were also derived from the simple fractional model to assess the low temperature performance of asphalt from the aspect of energy. The analysis results showed that adding CR to SBS modified asphalt was beneficial to reduce the low service temperature and increase the values of damping ratio and dissipated energy ratio before and after the aging process. It has been proved that the low temperature performance of SBS/CR modified asphalt is much better than that of SBS modified asphalt under different aging conditions.
The Effect of Dynamic Vulcanization on the Mechanical and Thermal Properties of Stereocomplex PLLA/PDLA/rubber Blends
Authors: Phattarateera S , Pattamaprom C 
Published: October 2019

AbstractThis study investigated the influence of dynamic vulcanization of sterecomplex PLA/PDLA (ST) containing various types of rubbers by using dicumyl peroxide (DCP) as a vulcanizing agent. In this work, natural rubber (NR), isoprene rubber (IR), silicone rubber (SI), acrylic rubber (AR), thermoplastic copolyester (TPE) and thermoplastic polyurethane (TPU) were selected. Here, 5 wt% of PDLA, 15 wt% of rubber and 2 wt% DCP as an initiator were melt-blended with PLA in an internal mixer at 180 0C and 50 rpm. It was found that the addition of DCP in (NR and IR) led to a significantly increase in the impact strength and % elongation at break. On the other hand, for the rubbers that do not have double bonds in the main chain (SI, AR, TPE and TPU), the addition of DCP led to a decrease in impact strength and % elongation at break compare to the case without DCP due to the lack of double bonds to react with DCP. For the effect of DCP on the rubber dispersion, it was found that the addition of DCP on the NR and IR could improve the interface compatibility of the rubber and PLA leading to smaller average rubber domain sizes than without DCP. For other types of rubbers, the average rubber domain sizes were bigger with poorer interface compatibility than without DCP. For the effect of DCP on the crystallinity, it was found that the addition of DCP could increase the crystal density and could consequently reduce the crystal sizes of the ST/rubber blends.
Effect of freeze-thaw cycling on fatigue behaviour in concrete
Authors: Boyd Andrew J. , Leone Andrea 
Published: October 2019

Abstract
Freeze-thaw damage is a deterioration mechanism caused when saturated concrete is exposed to temperature variations that cycle above and below its freezing point. The expansion of water in the concrete pore space due to freezing can lead to internal pressures that induce cracking, thus expediting the deterioration process through freeze-thaw cycles. The purpose of this investigation was is to evaluate the effect of freeze-thaw deterioration on the tensile fatigue life of air-entrained concrete at early stages of deterioration. Concrete cylinders were prepared with 0.45 and 0.65 water to cement ratios (W/C), then cured for 28 days before being subjected to the freeze-thaw cycling. After 0, 25 and 50 freeze-thaw cycles, the pressure tension (PT) test was used to induce tensile fatigue loading cycles until failure. The PT was capable of determining the decrease in fatigue life, represented as the number of cycles to failure, of the concretes when subjected to pure cyclical tensile loading after having first been exposed to freezing and thawing cycles. The results indicated that even though the ultimate static tensile strength of the specimens did not vary significantly due to the freeze-thaw cycles, the residual fatigue properties were degraded. UPV monitoring was able to determine the increase in internal damage, as the UPV of the specimens decreased with continued freeze-thaw cycling. It was shown that freeze-thaw deterioration reduces the ability of concrete to withstand cyclic loading, even at early stages prior to a decrease in static tensile strength.
Dynamic compliances of rigid foundation on layered poroelastic soils
Authors: Keawsawasvong Suraparb , Senjuntichai Teerapong , Plangmal Rawiphas 
Published: October 2019

Abstract
Dynamic interaction between a rigid foundation and layered poroelastic soils is studied in this paper. The foundation is subjected to time-harmonic vertical horizontal and moment loading, and bonded to a layered poroelastic half-space. The interaction problem is formulated by employing a discretization technique based on the rigid body displacement boundary conditions at the foundation-soil contact surface and the displacement influence functions of a layered poroelastic half-space. The discretization method used in this paper yields a flexibility equation system for the contact traction at the foundation-soil contact area. Comparison with existing solution for a rigid square foundation on an elastic half-space is presented to verify the accuracy of the present scheme. Selected numerical results for compliances of rigid square foundations are presented to portray the influence of poroelastic effects on the dynamic interaction problem.
Material image segmentation based on feature similarity and non-spherical clustering
Authors: Wang Huan 
Published: October 2019

Abstract
The microstructure of the material determines its physical and chemical properties. Although image segmentation and target extraction algorithms have advanced rapidly in recent years, few segmentation algorithms for material images have emerged. By analyzing the characteristics of material images, A new image segmentation method based on feature similarity and non-spherical clustering is proposed in this paper. First, the central pixels of the region are selected according to the feature similarity, and secondly, the attribution of the remaining pixels or the non-region central points are determined by the non-spherical clustering method. In this paper, ceramic images are used as experimental materials. The results show that the proposed method achieves satisfactory segmentation effect and provides some help for subsequent image-based material analysis.
Properties of Kenaf Fibers/Epoxy Biocomposites: Flexural Strength and Impact Strength
Authors: Suherman Hendra , Azwar Edri , Duskiardi  , Yovial  , Septe Edi 
Published: October 2019

Abstract
Kenaf is a non-woody plant, which has high potential fiber to be used as polymer matrix reinforcement. Different compositions of kenaf fiber as bio reinforcing material at different fabrication process parameters will produce different biocomposite properties. This study uses kenaf fibers in the composition of 10, 20, and 30 wt.% as reinforcing material. Kenaf fiber and epoxy resin were mixed based on predetermined compositions, stirred using a mechanical stirrer at 200 rpm for 10 minutes. Then the mixture is poured into a mold and placed on a hot press machine. Pressure of 50 kg/mm2 for 30 minutes at 150°C is used to produce kenaf fiber/epoxy biocomposite. The result showed that the increasing of kenaf fiber content in the matrix is succeeded to increase the flexural and impact strength of the biocomposite kenaf fiber/epoxy produced. The highest flexural strength (136 MPa ) and highest impact strength (180 KJ/m2) were obtained at a composition of 30 wt.% Kenaf fiber.
Research of Concrete Durability in Compressed Elements with Different Types of Confinement Reinforcements
Authors: Krishan Anatoly L. , Chernyshova Elvira P. , Chernyshov Vladislav E. 
Published: October 2019

Abstract
The paper presents experimental research of short center compressed elements with circular cross section in different types of concrete confinement reinforcements, namely by introducing glass fiber-reinforced shell, steel spiral and by using these two types together was conducted. The results of the conducted experiments show the positive influence of both outer glass fiber-reinforced shell and spiral reinforcements on the durability of such elements. The highest degree of durability was achieved when two types of confinement reinforcements were used simultaneously. The durability of the concrete core of the samples made from class C40 concrete increased by 3.25 times and equaled 135 MPa. In case of the initial class C80 concrete the effect of confinement reinforcements was considerably smaller but nevertheless it was high enough. The durability of the concrete core increased by 2 times. The introduction of two types of confinement reinforcements considerably improved the deformability of compressed elements. The maximum recorded values of contraction longitudinal strain of the samples made of high endurance concrete were about 1%, and in case of concrete class C40 they were 2.4%. Such high level of deformability in compressed elements will help to effectively use high durability longitudinal reinforcements with the compression yield strength up to 2000 MPa and higher in them.
Synthesis of hydrophilic silica nanoparticle and its application as self-cleaning coating for solar cell panels
Authors: Boonsong S , Sowasod N , Muangnapoh T , Wongchaipanich J , Jarunsrirat W , Tanthapanichakoon W 
Published: October 2019

Abstract
In past decades, nanotechnology has attracted much attention among researchers and industries due to its high potential of adding significant values to the original materials. Thin film coating with nanomaterial can provide new properties and enhance performances of pristine surfaces for certain applications. In this research, we investigated the development of superhydrophilic self-cleaning coatings for solar panels using colloidal silica nanoparticles. The coatings consist of colloidal silica nanoparticles with the average size of 30 nm, sodium dihydrogen phosphate and boric acid under various formulations. The coatings can be applied by simple painting or fine spraying. The light transmittance of the coated samples was characterized by UV–visible spectrophotometer. The water contact angle (WCA) was measured by a contact angle instrument. It was observed that the optimum weight ratio of silica nanoparticles : sodium dihydrogen phosphate : boric acid was 22:1:1 with contact angle of 1.83° and transmittance of 65%.
Effect of curing temperature and particle size distribution on unconfined compressive strength of raw and treated fly ash-lime modified phosphogypsum waste
Authors: Mashifana T , Okonta F , Ntuli F 
Published: October 2019

Abstract
The Voluminous quantity of phosphogypsum waste is generated by phosphoric acid manufacturing industry and end up being landfilled, resulting into environmental pollution. This study was done to determine applications for raw and treated waste phosphogypsum in building and construction, to determine the best conditions to produce the final product. Two readily available wastes namely phosphogypsum and fly ash were used and blended with hydrated lime. Best strengths was obtained from a mixture of phosphogypsum-lime-fly ash specimens were at elevated temperatures. The strengths obtained at the temperature of 80°C were above the 3.5 MPa permissible strength for building masonry with unconfined compressive strength up to 4.8 MPa. At lower temperature of 40°C the optimum strength obtained was at the minimal phosphogypsum content of 30%. The optimum strength was achieved at the PG content of 50% for raw PG and 60% for treated phosphogypsum. The strengths obtained for the treated phosphogypsum were lower than the minimum permissible load bearing strength due to the non-uniform particles distribution and the presence of impurities and forces of adhesion between citric acid and phosphogypsum. Increasing the curing temperature also reduced the radionuclides initially present in the raw PG without any prior treatment.
Stabilization of gold mine tailings: The effect of hydrated lime on the unconfined compressive strength
Authors: Mashifana T , Sithole N , Mkhonto E 
Published: October 2019

Abstract
Stabilization of gold mine tailings for application in the building and construction industry, provides a significant solution to the shortage of building and construction materials for the country’s growing population. The use of gold mine tailings in the production of building blocks / bricks, is examined in this study. The tailings used in the study were characterized by having an optimum moisture content (OMC) of 14.92% and a maximum dry density (MDD) of 1 757 kg/m3. The specimens were cured at a temperature of 80oC and hydrated lime was added as a stabilizing additive to enhance the chemical and geotechnical properties of the material. The use of lime as a stabilizing additive was successful in increasing the unconfined compressive strength (UCS) of the material. UCS was improved from 0.04MPa to a maximum strength of 3.02MPa. As far as the UCS is concerned, the optimum tailing: lime was obtained at a ratio of 70:30 and the produced material is suitable as masonry.