bluuebunny/crossref_metadata_2025_split huggingface dataset:
3 m × 3 m heterolithic passive resonant gyroscope with cavity length stabilization
Authors: Zhang Fenglei , Liu Kui , Li Zongyang , Feng Xiaohua , Li Ke , Ye Yanxia , Sun Yunlong , He Leilei , Schreiber K Ulrich , Luo Jun , Lu Zehuang , Zhang Jie 
Published: July 2020

Abstract
Large-scale high sensitivity laser gyroscopes have important applications for ground-based and space-based gravitational wave detection. We report on the development of a 3 m × 3 m heterolithic passive resonant gyroscope (HUST-1) which is installed on the ground of a cave laboratory. We operate the HUST-1 on different longitudinal cavity modes and the rotation sensitivity reaches 1.6 × 10−9 rad s−1 Hz−1/2 above 1 Hz. The drift of the cavity length is one of the major sensitivity limits for our gyroscope in the low frequency regime. By locking cavity length to an ultra-stable reference laser, we achieve a cavity length stability of 5.6 × 10−9 m Hz−1/2 at 0.1 mHz, a four orders of magnitude improvement over the unconstrained cavity in the low frequency regime. We stabilize the cavity length of a large-scale heterolithic passive resonant gyroscope through active feedback and realize long-term operation. The rotation sensitivity reaches 1.7 × 10−7 rad s−1 Hz−1/2 at 0.1 mHz, a three orders of magnitude improvement over the unconstrained cavity, which is no longer limited by the cavity length drift in this frequency range.
Wavelet-aided guided wavefield imaging of delaminations in laminated composite plates
Authors: Sha Ganggang , Xu Hao , Radzieński Maciej , Cao Maosen , Ostachowicz Wiesław 
Published: July 2020

Abstract
Delamination is a commonly encountered type of damage in composite structures, which may lead to degraded performance and even failure of structures. Thus, detection of delaminations is considered a vital task to maintain structural integrity and reliability. This paper presents a delamination imaging method based on the analysis of guided wavefields. The method relies on the fact that delaminations in a structure will cause wavefield anomalies, which in turn can be utilized for the indication of delamination zones. Such anomalies, however, could be easily masked by the major components of the wavefield signals including incident waves from actuators and reflected waves from structural boundaries. To address the problem, one-dimensional wavelet transform (WT) is used to process the wavefields leading to WT wavefields. The WT wavefields can highlight signal anomalies associated with delaminations. A WT wavefield imaging algorithm is first constructed step by step in detecting multiple delaminations in a glass fiber reinforced polymer (GFRP) plate. The algorithm is then successfully used in the imaging of a single delamination zone in a carbon fiber reinforced polymer (CFRP) plate. The locations, sizes, and shapes of the delamination zones in the GFRP and CFRP plates are clearly visualized in the ultimate damage maps.
High-bandwidth open-loop motion control of a piezo-positioning mechanism based on a composite electromechanical dynamic model
Authors: Yang Haigen , Zhu Wei 
Published: July 2020

Abstract
The piezo-positioning system with high dynamic performance is urgently needed in the field of precision manufacturing and precision instrumentation. The observed rate-dependent hysteresis presents more challenges and difficulties for accurately modeling the response behavior of the piezoelectric stack actuators over the last several decades. Our previous research shows that the rate-dependent characteristics may be caused by the dynamic characteristics of the power amplifier. In order to achieve the high-bandwidth and high-speed motion control accuracy, we propose an open-loop compensation control method of a piezo-positioning mechanism based on a composite electromechanical dynamic model. The dynamic model can describe the dynamic characteristics of the power amplifier, the inverse piezoelectric effect and the dynamics of the mechanism. Experimental results show that the proposed control method can achieve precise motion control of the piezo-positioning mechanism within 1–800 Hz bandwidth.
Collagen particles with collagen-binding bone morphogenetic protein-2 promote vertebral laminar regeneration in infant rabbits
Authors: Cui Yi , Xu Bai , Yin Yanyun , Chen Bing , Zhao Yannan , Xiao Zhifeng , Yang Bin , Shi Ya , Fang Yongxiang , Ma Xu , Dai Jianwu 
Published: July 2020

Abstract
The vertebral laminar defects caused by severe spina bifida occulta, spinal fracture, or bone tuberculosis require surgical treatment. The reconstruction of vertebral laminar defects remains challenging, especially in children. In this study, we created an animal model of vertebral laminar defects in newly weaned rabbits to evaluate the therapeutic effect of bovine bone collagen particle (BBCP) that combined with bone morphogenetic protein-2 with collagen binding domain (CBD-BMP-2). The tissues at the injury site which were harvested after 12 weeks indicated that newly formed bone was observed in both BBCP and BBCP/CBD-BMP-2 groups, whereas the injury site of the control group was mostly filled by fibrous tissue. The BBCP/CBD-BMP-2 group recovered better than the BBCP group. These findings indicate that a combination of BBCP with CBD-BMP-2 may be a good strategy for vertebral laminar defects in children.
Whole Effluent Toxicity (WET) Test On Microalgae Reactor and Acute Toxicity on Daphnia sp.
Authors: Bayu Kartikasari Ika , Yulianto A , Asmarany A 
Published: July 2020

Abstract
Processing using alga reactor was made one of the solutions in wastewater treatment. Symbiotic relationship of Algal-bacteria increases the potency of processing wastewater. These capabilities can be enhanced by compounding CO2 in photosynthesis in processing wastewater. WET (Whole Effluent Toxicity) testing is needed to monitor the effects of toxicity of algae reactor. The research was carried out using waste of Water Waste Management Installations in Sewon, Yogyakarta with supplying 0.2 L/min and 0.5 L/min of CO2. This research aims to know the LC50 and analyze the characteristic relationship of waste water as the results of algae reactor process. Acute toxicity test is performed with a static method within 24 hours using animal test Daphnia sp. on day 1, 6 and 13. Based on the analysis of the characteristics of waste are known that DO, pH, temperature, light intensity strongly influenced the death of Daphnia sp. Based on the results of the analysis of algae-bacteria, the best result came with the addition of CO2 amounting to 0.2 L/min. While the worst occurred at reactor Algae.
Structural design of airport runway Case study: Jos Orno Imsula MOA Airport
Authors: Khoemarga Kelly V , Noor Tajudin Anissa 
Published: July 2020

Abstract
Jos Orno Imsula MOA Airport is a SATPEL class airport. This airport is a potential services airport. Jos Orno Imsula MOA airport has an existing runway with the dimensions of 1400 m x 30 m, with azimuth direction 10 – 28, and 60 cm pavement thickness. This study aim to redesign the geometric and pavement thickness of runway. The methods used in this study are Aeroplane Reference Field Length (ARFL) method for calculating the length of the runway, and Federal Aviation Administration (FAA) method for calculating the pavement thickness of runway. The analysis shows that the dimension of runway required is 1260 x 30 m, and the pavement thickess required is 45 cm.
Benefits of the Opex Pro Application in Online Project Monitoring and Evaluation at PT. XYZ
Authors: Ronald Simanjuntak Manlian A. , Nahdi Mustafa 
Published: July 2020

AbstractAlong with the process of globalization, information technology has become an inseparable part of the world of construction services. However, the use of information technology in the field of construction management is not as popular as compared to construction planning especially in the process of project monitoring and evaluation. The contractor must have an integrated information system to be able to support the process of monitoring and evaluation that is true and right so that objectives can be achieved according to plan. PT. XYZ is a contractor that creates an integrated software-based information system called Opex Pro that is used to support project monitoring and evaluation. Opex Pro is used on smartphones and has been implemented for a number of years, but the benefits and positive effects have yet to be measured. This study aims to identify components and analyze the benefits of implementing the Opex Pro application as a means of project monitoring and evaluation. The scope of the problems in this study is limited to the application of the Opex Pro Application in the Building Division of PT. XYZ with a sample project manager. Literature review is focused on construction management, information technology in the world of construction, project monitoring and evaluation, and management of construction resources. The quantitative approach was chosen as the research method and analysis was carried out on all selected samples. It is expected that the application of the Opex Pro application can have a positive impact on the project monitoring and evaluation process at PT. XYZ continuously.
Designing Press Tool For Carton Finishing Process To Improve Productivity And Efficiency
Authors: Widodo Lamto , Adianto  , Rohana Nasution Siti , Wijaya Priadi 
Published: July 2020

Abstract
Using cardboard as packaging protects the product from damage while at the same time improving its appearance to attract the attention of customers. The packaging company, PT. XYZ, works manually without using machines or tools. As a result, inefficiencies tend to occur because workers waste time and energy. It also has the potential to cause extreme fatigue and workplace accidents. This research is a field of ergonomics research, the aim is to understand the physical complaints of workers, the work sequence of workers, to then design a helper tool and finally evaluate the work posture of workers, before and after repairs. To improve workers ‘conditions, researchers collected workers’ identities and analyzed their physical complaints using questionnaires, including Nordic Body Map, REBA analysis, OWAS analysis, MFA analysis, and measurement of right and left hand maps in standard time. We also identified workers’ needs, initial specifications to conceptualize the design of assistive devices. We obtain the design concept by determining the final specifications and checking the data using CATIA software. The final REBA score after applying the helper press yields a score of 3 on pressing and folding cartons. Improvements also managed to eliminate lifting and lowering activities during the finishing process. Analysis result of the working conditions before and after implementation are as follows; cycle time decreased from 320.23 to 275 seconds (14.12%), normal time decreased from 336.24 to 299.75 seconds (11%), and standard time dropped from 437.11 to 374.69 seconds (14, 3%).
Land mapping with least median of squares regression using landsat imagery: a case study Jakarta and sorrounding area
Authors: Mulyawan Bagus , Jovianto Nicholas , Hendryli Janson , Erny Herwindiati Dyah 
Published: July 2020

Abstract
Impervious surface is an area that has undergone natural or semi-natural substitution of artificial land cover which is usually waterproof and relatively permanent, including settlements, industrial buildings, road networks, railroad networks, high voltage electricity networks, airports air and sea ports. Changes cause the narrowing of rivers and open land which become water catchment areas. One of the problems that triggered an increase in impervious land is urbanization. This study aims to map land changes in the Jakarta and surrounding areas using the least median of squares regression method. Based on data from land classification results using 4 classes, Jakarta and Tangerang are areas that have more impervious land than non-impervious land. Meanwhile, Bogor, Bekasi, and Depok are areas that have more non-impervious land
Evaluation of Side Friction in Ihcm for Highway 4 Lanes 2 Ways Divided
Authors: Najid  
Published: July 2020

Abstract
IHCM (Indonesia Highway Capacity Manual) was issued and came into force in 1997. After 20 years there has been a change in traffic from the number and composition, as well as the traffic regulation policy. As a result of this, the determination of IHCM’s road capacity is often incorrect. Therefore it is necessary to evaluate IHCM. This study tries to evaluate IHCM through side friction factors, as one of the factors that determine the value of road capacity. Research is limited to evaluating the weight of each side friction factor and the effect of land use from the survey results using statistical analysis. From the analysis, it is found that the conditions for the use of shops, office and campus are in the category of high and low of side friction factor and the ranking of the relative weights of the side friction factors in IHCM is quite different.
Socket prosthesis manufacturing process made from bamboo fiber composite materials
Authors: Purna Irawan Agustinus , Wayan Sukania I , Anggarina Paula T. , Raditya Danendra Albertus , Dimas Baskara Gregorius 
Published: July 2020

Abstract
This research aims to develop the manufacturing process of making socket prosthesis with bamboo fiber composite material and epoxy matrix. Bamboo fiber was chosen because it is strong, environmentally friendly, and recyclable. The focus of research is to arrange the manufacturing process of making sockets, starting from material preparation to socket testing. The method used in this study is a customized method and prototype socket manufacture in accordance with the dimensions obtained from the patient. Based on the results of the research that has been carried out, stages of the manufacturing process, results of compressive strength testing, and morphological analysis of socket products are obtained. These results will be a reference in future research.
Flat Plate Type Solar Collector Performance Using Double Thermal Insulation
Authors: Setyawan EkoYohanes , Kurniawan Arif , Rahmadianto Febi , Napitupulu Richard A. M , Siagian Parulian 
Published: July 2020

Abstract
Indonesia is a country that has a huge potential of solar radiation energy since it is located in the equator. This causes Indonesia to have a tropical climate and receives almost the same emission of solar radiation throughout the year. National average solar energy potential is 16 MJ/day. This energy potential can be used as a source of thermal energy. To improve the energy potential, a research performance is done by using double thermal insulation solar collectors so that the energy can be received optimally. One alternative that is used is adding Styrofoam and Polyurethane which are installed on all sides of the collector except the upper side. Styrofoam and Polyurethane have 3 cm thickness and low thermal conductivity value therefore it is able to isolate the energy inside the solar collector. This experiment was done in a day with energy coming at the test reached 8,798,634 j/m2 with 69% efficiency level.
Determine The Value of Mark Up at Bid Price Hotel Buildings
Authors: Dwijayanti M , Johny J 
Published: July 2020

Abstract
Cost plan has an important role in construction projects. Every part of activites need cost from preliminary to hand over the project. As an owner representative to control the budget project, a quantity surveyor has to prepare an owner estimate. The owner estimate is a reference to evaluate the quotation in bidding process. The accuracy of calculation owner estimate is very important. Cost-based pricing is one of the strategies in the bidding process, the formula of quotation is cost of the project plus mark up. In the process of bidding, contractors have their consideration of internal and external factors in every project, so they produced a different value of mark up. Many experts made formula for bidding strategy, in Friedman’s and Gates’s formula the value of mark up is determined by probability of winning in every contractor. Purpose of this research is to determine the amount of mark up by Friedman’s and Gates’s formula. The result of analysis with Friedman’s and Gates’s formula is more or less at seven percent of mark up. The result is determined by number and type of competitors.
Risk Identification in Procurement of Glass facade in High-Rise Office Buildings in Jakarta
Authors: Simanjuntak Manlian Ronald A. , Tanumihardja Reinaldi 
Published: July 2020

Abstract
This research aimed to identify the risk of the procurement stage of glass façade in the high-rise office building in Jakarta. In this research, the procurement phase is analyzed using the PMBOK reference (5th edition). The number of risks that occur during the procurement process can certainly hamper the project. These risks can cause to the project completion time that are not in accordance with the project schedule. Besides that, the risks could make the project cost even greater. This certainly can lead to big loss to the project. Therefore, it is very important to identify the main risks at the procurement stage from the beginning of the construction process. According to the PMBOK, the stages of the procurement is divided into 4, which consists of plan procurement, conduct procurement, control procurement and close procurement. Based on the research results, obtained 45 risks that are divided into 4 phases of the procurement.
Study Phase of Operational Management Process X Building
Authors: Bari Putri Janerizka , Simanjuntak Manlian Ronald A. 
Published: July 2020

Abstract
Building operational management has consistently become a requirement to fulfill, especially for buildings that are enabled for the public interest. The concept of operational management especially in the maintenance of poor buildings can cause a variety of functions building facilities will be increasingly decreased and affect the quality and comfort of the building, hence it is very important to the owner of the building/Building users know the understanding and process of building operational management. This research aims to study the understanding of operational management and based on research results there are 4 stages of the process in operational management, namely review design, planning, organizing, movement, and Control.
Risk Identification in Procurement of Precast Facade Procurement on High Rise Buildings in Jakarta
Authors: Sulistianto Ardian , Ronald Dr. Manlian , Simajuntak A. 
Published: July 2020

Abstract
The purpose of this research is to identify the risk of the precast façade procurement of buildings in Jakarta. In this study there are three phases, procurement planning, implementation of the procurement and procurement management. The stage refers to PMBOK (6th Edition). On the procurement of precast façade wall buildings there are several constraints that can be the cause of risk that affects the delay of the construction project. Therefore, the main problem in this research is to be able to know and identify the cause of the risk of precast façade wall procurement on high rise buildings in Jakarta and to know the precast façade wall character on Building. The results of this research are expected to be a reference in preventing and minimizing the risks that occur in precast façade wall procurement in high rise buildings in Jakarta.
Evaluation And Decrease Of The Likelihood Of Risks In Mass Floor Excavations According To Your Texture In Peru
Authors: Ramos Jhannel Arteaga , Alvarez Giancarlo Andia 
Published: July 2020

Abstract
Safety in the area of the construction is a matter of great interest and concern for both the public and private sectors, since there is a huge number of occupational accident occurrences, many of them with unfortunate endings for the existence of lives lost, being consequence mainly by the activity of massive and manual excavations.For this reason, the use and understanding of the norms in the safety and contingency plans is fundamental when starting a project, since the rigorous monitoring of this plan will define the increase or decrease in the probability of risk that each activity may have in construction.
Comparative study between MSC Marc/Mentat student version and Simufact Welding for three-passed butt joint
Authors: Napitupulu Richard A.M. , Hutabarat Chilinton , Manurung Charles S.P , Manurung Yupiter HP , Graf Marcel 
Published: July 2020

Abstract
In this research, FEM simulation was created butt joint with weld filler 3D-solid geometry. The assigned substrate element type is created and modeled on a 9 mm thickness. The three-passes of butt joint was undergoing with using the MSC Marc / Mentat student version simulation and simufact welding simulation. The butt joint designed with three passes which are penetration, filler pass and the capping for both simulations. Thermo-mechanical FEM simulations using MSC Marc / Mentat student version and simufact welding are implemented throughout the analysis. The preferred heat source model is an ellipsoid Goldak normally used for arc welding processes and weld path process in one direction. The temperature distribution caused by the welding process on the specimens must be analyzed with the same clamping conditions and the same load. Both simulations were collecting the temperature distribution to observe the calibration of software. From the results of the temperature distribution, which simulation can be assessed which is more accurate. But to be more accurate in comparing it, the two simulations must be compared directly with the experimental, with the similar material, dimensions, and welding parameters.
Concept design of solar cell satellite dish
Authors: Teja Steven , Travis Adrianto Nicholas , Louis Martin JM , Kurniawan Nicholas , Purna Irawan Agustinus 
Published: July 2020

Abstract
Solar panels are devices that consist of solar cells that convert light into electricity. They are called solar on the Sun or “sol” because the Sun is the strongest light source that can be utilized. Solar panels are often called photovoltaic cells, photovoltaic can be interpreted as “light-electricity”. Solar cells or PV cells depend on the photovoltaic effect to absorb the Sun’s energy and cause currents to flow between two opposing charged layers. The purpose of this study is to analyze the satellite dish using solar panels, so this tool is a signal search tool that uses solar energy to run to carry out its functions. As we know that many places or areas that are still often experiencing power outages so that it can hamper and interfere with community activities. Therefore, this research wants to facilitate the public, especially the current generation who need electricity every day so that when there is a power outage, the satellite dish will utilize solar energy as its main source. This research uses a satellite dish as an intermediary to produce electrical energy with the help of solar energy and is collected into a high-voltage battery in the form of electricity, so that it becomes a source of electricity.