bluuebunny/crossref_metadata_2025_split huggingface dataset:
Technological support of the form-profile of the profile of the rings of the rolling bearings
Authors: Zverovshchikov Alexander , Zverovshchikov Vladimir , Nesterov Sergey 
Published: January 2020

Abstract
The methods of forming the working surfaces of the rings of rolling bearings are considered. The influence of the shape of the profile of the rings on the performance characteristics of bearings is shown. The schemes of finishing the rings by superfinishing with profile bars and polishing with an inertial compacted abrasive particles are given. A new technology for improving the quality of the working surfaces of the rings is proposed and the results of experimental studies of the efficiency of ring processing are presented.
Formation of the quality indicators of the working surfaces of the rings of the roll bearings in finishing operations
Authors: Zverovshchikov Alexander , Zverovshchikov Vladimir , Nesterov Sergey 
Published: January 2020

Abstract
The results of the study of the quality indicators of the surface of rolling bearing rings after the operation of fine grinding with an abrasive wheel and polishing with a profile elastic tool of abrasive particles compacted with inertial forces are presented. The advantages of processing with an elastic tool and the effect of processing modes on the roughness of the working surface of the rings, the amount of waviness and cut are shown. Recommendations on the practical application of the new technology are given.
On the way to the optimal design of an inflatable aerodynamic decelerator of space debris removal system for CubeSat nanosatellites
Authors: Reznik S V , Smirnov G K , Varlamov S A 
Published: January 2020

Abstract
In order to avoid pollution of the near-Earth space out-of-service small spacecrafts could be transferred to the disposal orbits in dense atmosphere with the help of inflatable decelerator. The issues of aerodynamics and heat transfer are of key importance for such systems design. The movement conditions in a low Earth orbit of a spherical inflatable aerodynamic decelerator designed for small spacecrafts removal are considered. The preliminary results of thermal analysis of the decelerator made of polymer film with the surface metallization are presented.
The heat transfer features of the thin-walled shell of an inflatable aerodynamic decelerator for CubeSat nanosatellites
Authors: Abramova E N , Reznik S V 
Published: January 2020

Abstract
Small spacecraft, first of all, nanosatellites of a CubeSat standard have a relatively small operational life. After their operational lives have expired, they turn into space debris. Disabled spacecraft can be transferred to the disposal orbit in the dense atmosphere using inflatable decelerators in order to avoid pollution of the near-Earth space. Decelerator’s temperature state is formed under the action of thermal radiation from the Sun and the Earth and kinetic heating caused by movement in a free-molecular medium. The specific features of heat transfer of inflatable decelerator’s thin-walled spherical shell are considered. The inflatable decelerator is designed for spacecraft removal during moving in the low-earth orbit.
Damage accumulation in supermartensitic stainless steel during plastic deformation
Authors: Batanova N V , Danilov V L 
Published: January 2020

Abstract
Supermartensitic stainless steel usually used in the oil, gas and hydropower industries. In order to optimize the process of manufacturing of workpieces from these steels, damage accumulation was investigated in supermartensitic stainless steel during plastic deformation. In the present paper dependence of damage on plastic strain, grain size and strain rate is presented based on experimental data for 03Cr13Ni4Mo steel. Also the modeling method of damage calculation due to critical pore accumulation is proposed.
Synthesis of a deforming-cutting mill design
Authors: Novikov P A 
Published: January 2020

Abstract
The article is devoted to the synthesis of a new threading tool used to form internal threads in products made of aluminum alloys. As a rule, when machining internal threads in complex parts, the manufacture of which is carried out at milling machining centers, thread mills are used. This is due to low reliability of threading operations where classic marking tools are used, which are unacceptable for parts that have high cost at this time. In addition, when processing products made of aluminum alloys, there are features related to the presence of porosity in the material and ‘tears’ on the treated surface, the nature of which is associated with the cutting process. This degrades such an operational parameter of threaded joints as tightness. To solve these problems, the design of a new tool, a deforming-cutting mill, was proposed on basis of morphological analysis and synthesis, and the combined machining principle was taken as a basis for its creation.
Approximation of Shear Wave Velocity Using MASW Method for Seismic Hazard Mitigation: A Preliminary Study of Banda Aceh City Indonesia
Authors: Jamaluddin K , Chairullah B , Irwandi I , Majid T 
Published: January 2020

Abstract
Earthquake 9.1 SR happened in the Aceh Province Indonesia that followed tsunami on December 2004. After this event, the development of infrastructures in Banda Aceh city has shown rapidly progress. Therefore, learning of the experience of this natural event that has caused many casualties and infrastructures, the Banda Aceh city has been being taken initiative as a city that is friendly of disasters. The research objective analysed of influence sedimentation behaviour at buildings. The shear wave velocity parameters using MASW method were used for sediment characteristic assessment. The sediment characteristics are very soft, soft, dense and very dense that it’s have level different of shaking, respectively. The detail of 1D profiles of shear wave velocity have obtained. In this case, we analysed VS30 parameters of eleven locations of all measurements at the Ulee Kareng Sub District, Banda Aceh city. The ground shaking level of sediment layer depend of sedimentation characteristics. The sediment characteristic of Ulee Kareng Sub District, Banda Aceh has shown medium dense and soft soil.
Risk Factors Influencing the Construction Projects in Yemen from Expert’s Perspective
Authors: Bahamid R A , Doh S I , Al-Sharafi M A , Rahimi A R 
Published: January 2020

Abstract
This purpose of this study is to validate the important risk factors influencing the construction projects in a developing country of Yemen by using experts’ evaluations and literature review. These factors influence the project’s quality, time and cost. The semi-structured interviews were employed through online means using thirteen experts to achieve the set objective. Depending on the expert’s overviews, out of 56 considered factors, 42 factors were assigned as the most related risk factors influencing the construction projects in Yemen. The obtained outcomes from this study can serve as the risk factors for building blocks in establishing a conceptual model to manage risks of the construction projects in Yemen.
Performance of Coir Fiber Addition for Clay as a Sub-Grade for Pavement Design
Authors: Munirwan R P , Munirwansyah  , Marwan  , Ramadhansyah P J , Kamchoom V 
Published: January 2020

Abstract
Clay soil behavior often becomes problematic with building construction, it is about the shrink-swell behavior in clay when influenced by water content. Coconut husk fiber (coir fiber), in general, is an industrial waste which is still infrequent to be re-used. This study aims are to determine the effect of coir fiber addition for mechanical stabilization of clay soil in terms of CBR (California Bearing Ratio) value. Soil samples used for laboratory tests were collected from Ulee Glee area of Pidie Jaya Regency. According to AASHTO classification, the soil category is A-7-5 (25) while for USCS classification, the soil is OH (Organic High). The percentage of added coir fiber was 0%, 0.2%, 0.4% and 0.6% of the dry weight of the soil with a coir fiber length of 2 and 3 cm. Two treatments of clay-coir fiber mixing method were applied namely direct mixing and mixing by layers. The results of natural soil compaction test obtained that OMC (Optimum Moisture Content) value and dry soil weight (γdmax) was 26.8% and 1.34 gr/cm3 respectively. The highest CBR results were obtained for clay soil with 0.4% coir fiber 3 cm (direct mix) with CBR value = 17.7%. Furthermore, the lowest CBR value is 10% for percentage of 0.2% with coir fiber length 2 cm (by layer). In general, high organic clay soil with coir fiber mixture addition is able to increase the CBR values if compared to CBR of natural soil which is 8.15%. Thus, the use of coir fiber in this study is able to improve soil bearing capacity which is useful for construction material in the site.
Liquefaction Potential Analysis of Reusep Prestress Bridge in Pidie Jaya due to 6.4 Mw Earthquake
Authors: Munirwan R P , Munirwansyah M , Jamaluddin K , Gunawan H , Mubarak A Z , Ramadhansyah P J , Youventharan D 
Published: January 2020

Abstract
Pidie Jaya is one of the districts in Aceh Province – Indonesia. On December 7, 2016, Pidie Jaya experienced a shallow 6.4 Mw earthquake which destroyed some vital buildings and also human loss. Based on preliminary field investigation, some geological damages like soil movement, soil cracks, and liquefactions occur because of the earthquake. Some liquefaction phenomena scattered in the area of Ulim, Panteraja, Meunasah Balek, Manohara Beach and Sagoe Trienggadeng. An evidence of liquefaction in Pidie Jaya area was displayed in this research based on several literature review. Furthermore, these paper aims to identify liquefaction possibilities in Trienggadeng Reusep Prestress Bridge based on a geotechnical investigation of N-SPT and some seismic data by using Kishida method. The surrounded area of the bridge was first evaluated in terms of geological setting, tectonics and seismic activity related to 6.4Mw of the previous earthquake. Furthermore, it was found from the soil profile that the studied area has a potency of liquefaction because of several saturated sand layers and high groundwater level. Effective overburden pressure of sand layers was calculated and plotted with N-SPT value to determine the possibility of liquefaction. The result shows that liquefaction potential shows high possibility for sand dominant layers both from bor-log 1 in 17.5 m and 25 m depths, and bor-log 2 in the depth of 17 m and 26.5 m.
Properties of Concrete Containing Crushed Palm Oil Clinker as Partial Fine Aggregate Replacement
Authors: Sulaiman M A , Ali M I , Al-Amri M Y , Muthusamy K , Albshir Budiea A M , Nordin N , Duraisamy Y , Othman R 
Published: January 2020

Abstract
The growing demand for sand supply for construction industry use especially in concrete production drives the sand mining industry to flourish. However, excessive sand mining would affect the river environment, aquatic life and water quality. At the same time, the increasing quantity of palm oil clinker, which is a by-product at palm oil mill disposed at landfill, poses negative impact to the environment. The use of palm oil clinker waste as sand replacement in concrete production would be able to reduce the use of natural sand from the river and dumping of clinker waste at landfill. The current research investigates the fresh and mechanical properties of concrete containing palm oil clinker as partial fine aggregate replacement. A total five concrete mixes were produced. The control specimen was prepared by using 100% natural sand. Other mixes were formed by integrating crushed palm oil clinker as partial fine aggregate replacement ranging from 10%, 20%, 30% and 40%. All specimens were water cured up to 28 days. The specimens were subjected to slump test, compressive strength test, flexural strength test and water absorption test. The finding shows that suitable amount of palm oil clinker can be used as partial fine aggregate replacement in concrete production. Concrete containing palm oil clinker up to 40% replacement exhibits water absorption value lower than 10%, thus classified as good quality concrete.
Water Quality Status and Heavy Metal Contains in Selected Rivers at Tasik Chini due to Increasing Land Use Activities
Authors: Nadiatul Adilah A A G , Nurul Nadia H 
Published: January 2020

Abstract
This study investigates the current water quality levels in the rivers around Lake Chini namely Jemberau River and Chini River during the dry season of 2018 and the rainy season of 2019. There are thirteen types of water quality parameters and seven types of heavy metals have been made experimental and classified based on the Water Quality Index which is from the Department of Environment (DOE-WQI) and the National Water Quality Interim Standard, Malaysia (INWQS). There are chemical and physical parameters that have been analyzed such as pH, temperature, turbidity, Electrical Conductivity (EC), Suspended Solids (SS), Total Suspended Solids (TSS), Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Ammonia Nitrogen (NH3-N), Potassium (K), Nitrate (N) and Phosphorus (P) were analyzed at the sample site and laboratory experiments were also performed. In addition, there are seven types of heavy metals that have been tested in the laboratory to determine the concentration of heavy metals contained in the water samples from the Chini River and the Jemberau River which are Copper (Cu), Chromium (Cr) Cadmium (Cd), Ferrum (Fe), Zinc (Zn), Manganese (Mn) and Lead (Pb) were tested using laboratory tools named as Atomic Absorption Spectroscopy (AAS). Based on the results of the study conducted according to the Water Quality Index (WQI), the water quality at selected locations which are Jemberau River and Chini River located near Lake Chini was classified as Class III which means water in the river requires extensive treatment to ensure water quality return clean and safe to use as drinking water to the locals in the future. According to the results of the study, there are activities conducted around Lake Chini which have caused water pollution which involves the release of heavy metals. Among the activities identified as the main cause of water pollution in Lake Chini are iron mining, agriculture, illegal logging and waste disposal from residential areas such as the National Service Training Program (PLKN).
Mechanical Performance of Stone Mastic Asphalt Incorporating Steel Fiber
Authors: Jasni N E , Masri K A , Ramadhansyah P J , Arshad A K , Shaffie E , Ahmad J , Norhidayah A H 
Published: January 2020

Abstract
Stone Mastic Asphalt (SMA) is a gap-graded hot mix asphalt that contains a large percentage of course aggregate and bitumen filler mastic. SMA is suffered from severe binder drain down due to the gap graded aggregates mixtures. Large difference between the sizes of aggregate tend to reduce tensile strength of the asphalt mixture. To overcome this, a type of fiber which is steel fiber is utilized to improve the tensile strength of SMA. Thus, the aim of this study is to increase the strength of SMA by utilizing steel fiber. To prepare SMA mixtures, specimens were compacted by applying 50 blows on each face using Marshall Compactor. Then, the modified specimens were tested to investigate the performance in terms of Los Angeles Abrasion Test, Marshall Stability Test, Resilient Modulus Test, and Dynamic Creep. From the results, it indicates that the addition of 0.3% fiber leads to better stability and stiffness while 0.5% fiber for resilient and enhanced modulus dynamic creep at 25°C and 0.4% fiber at 40°C. Thus, it can be concluded that the addition of steel fiber in the mixture significantly enhance the overall performance of SMA.
Construction readiness parameters for highway projects
Authors: Radzi A R , Rahman R A , Doh S I , Esa M 
Published: January 2020

Abstract
Highways greatly contribute to a country’s economic development and growth. Therefore, it is vital for highway construction projects to complete on time and budget. However, when a project starts construction prematurely, projects frequently experience interruption that eventually resulted in delays, causing a multitude of adverse effects on all project stakeholders. In other words, premature starts are one of the factors of construction delays. However, prior studies have little understanding of information that can help practitioners determine whether a highway project is premature or ready for construction. This study aims to identify the parameters used in practice to differentiate whether a highway construction project is ready or not to begin construction. To achieve this objective, interviews with sixteen industry practitioners working on highway construction projects are being conducted and analyzed. The significant findings include: (1) construction readiness can be assessed even as early as during the project start-up phase; and (2) not fulfilling the construction readiness parameters may cause a work stoppage, inefficient work, rework, and shortages in labor, equipment or materials. This study contributes to the current body of knowledge by identifying the parameters that indicate whether a highway project is construction-ready or construction-not-ready. The lessons from this study could help the industry to avoid premature starts in highway construction projects.
Effect of government policy towards the abandoned housing project in Malaysia
Authors: Saidah An’nisaa S , Nur Farhayu A , Nur Asyekin R , Mohamad Idris A , Ramli N I 
Published: January 2020

Abstract
The issue of abandoned housing project happens across the globe, and it brings nothing positive to the stakeholders as well as to the economic and environment. Even though there are numerous policies and the Malaysian government has promulgated laws, yet the problem of abandoned housing projects is still occurring and not yet been fully addressed. The objectives are to investigate the factor of government policy that contribute to the abandoned housing project and to suggest the suitable solution in mitigating the problem. After the extensive literature review and multi-choice questionnaire survey method been done, the author found that the requirement of 30% low cost house for each development and unstandardized policy together with strict regulation from authorities is one of the main factor that contribute to the abandoned housing project. This paper suggested that the requirement of 30% low cost house for each development should be revised and the requirements for statutory approval should be standardized and short. This study will be contributing an information to the stakeholder involved in housing development.
Strength and Porosity of Porous Concrete Pavement Containing Nano Black Rice Husk Ash
Authors: Ramadhansyah P J , Masri K A , Mangi S A , Mohd Yusak M I , Mashros N , Mohd Warid M N , Satar M K I M , Mohd Haziman W I 
Published: January 2020

Abstract
Rice husk ash (RHA) as replacement material in the conventional concrete mixture has been widely studying around the world. However, there is a lack of study on nanoparticle produced from black rice husk ash (BRHA) used as a replacement material in porous concrete pavement mixture. Therefore, this study aims to evaluate the performance of porous concrete pavement containing nano black rice husk ash in terms of compressive strength, porosity and its correlation. A nano BRHA dosage of 10, 20, 30 and 40% by weight of binder was used throughout the experiments. Four different grindings of BRHA were examined, and it was found that BRHA ground had a nanoparticle between 64 nm to 85 nm. There appears to be an optimum replacement of approximately 10% nano BRHA, during which time the compressive strength and porosity increase significantly.
Investigating the Relationship between Site Supervision and IBS Based Construction Projects
Authors: Syamsyul Hairi M S , Wan Salleh W R , Rahman R A , Doh S I 
Published: January 2020

Abstract
Successful delivery of construction of Industrialized Building System (IBS) projects needs an effective supervisor’s that have a combination of strong technical, interpersonal, communication, and managerial skills. Unfortunately, a consistent finding is that there are many factors that affecting site supervision and most construction works are not delivered on time and consequently have a problem during installation of IBS. Therefore, the main aim of the study is to identify the factors affecting site supervision in improving IBS productivity. The study adopts a questionnaire survey approach to elicit information from the respondents, and out of the seventy questionnaires administered fifty-five were retrieved. The information and the data from the questionnaires were analyzed using the average index method. From the finding analysis, the main factors affecting site supervision is on-site construction process. While the main problem during installation of IBS is required planning on time delivery. It is recommended that the quality of IBS product or components should be enhanced to promote better site supervision
Carbonation Resistance of Concrete with Fly Ash as Fine Aggregate
Authors: Zhang D , Mao M , Yang Q , Lim K S 
Published: January 2020

Abstract
In order to investigate the carbonation resistance of concrete with fly ash as fine aggregate (CFA), the rapid carbonation test was conducted to explore the influence of the curing age, water-to-cement (w/c) ratio, fly ash replacement rate and the activator on the carbonation depth. The experimental results show that prolonging the curing time is beneficial to improving the carbonation resistance of the CFA. The carbonation depth of the CFA correlates positively with the w/c ratio. With an increase in the fly ash replacement rate and w/c ratio, the carbonation resistance of the CFA increases to a remarkable extent. After 28 days of standard maintenance of the CFA, the compactness of the CFA is boosted due to the pozzolanic effect of the fly ash, and its carbonation resistance is enhanced compared to that of ordinary concrete. In addition, the incorporation of the activator marginally contributes to the improvement of the carbonation resistance of the CFA.
Success Factors of Design-Build Public Sector Projects in Malaysia
Authors: Lee Z P , Rahman R A , Doh S I 
Published: January 2020

Abstract
Various procurement methods are employed in the construction industry, with each having varying success rates. The popularity of design and build (D-B) method has been increasing worldwide because its distinctive features of integrating design and construction have successfully addressed the problems inherent in the traditional design-bid-build (D-B-B) method. Previous research efforts in Malaysia have been focused on establishing a D-B strategy, including its challenges and risks and defining a broader scope for implementing D-B in public projects. However, not many empirical studies have identified the D-B success factors in Malaysia’s construction industry. This paper aims to determine the main factors attributing to the successful application of the D-B method for public projects in Malaysia’s construction industry. Specifically, this paper answers the main research question of “What are the success factors of the D-B project delivery method in Malaysian public-sector projects?”. To achieve that objective, this study involves interviewing industry practitioners that have direct hands-on experience in managing D-B public sector projects in Malaysia. The interview data are analyzed to identify the D-B success factors in construction projects. The findings suggest that the underlying factors for successful D-B public project include client capabilities, competency of the construction leader, competency of the consultant team, organizational behavior, and effective project management system. The success factors in each underlying categories are discussed in the paper. This paper contributes a better understanding of the D-B project success factors in Malaysia’s construction industry.