bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on the method of measuring effective energy for quayside container crane based on weighted average method
Authors: Feng Shuangchang , Chang Xiaoqing , Xue Jiai 
Published: July 2020

Abstract
With the rapid development of the world economy, more and more quayside container cranes are put into use in ports. The quayside container crane has the characteristics of large quantity, large power consumption and great energy saving potential. In order to save energy of quayside container crane, the key is to accurately measure the effective energy, the supply energy and the energy utilization efficiency. The weight of the loaded goods carried by the quayside container crane varies greatly in actual work. The test load in the traditional method is specified as 60% of the rated lifting weight, which is different from the actual situation of the crane. Based on the load state level, this paper puts forward the new concept of weighted average effective energy and optimizes the calculation formula. The new test method provides a basis for the accurate test of the effective energy and the energy utilization efficiency in the future.
Research on Life Assessment of Ni-MH Battery through Orthogonal Experiment under Multiple Aging Factors
Authors: Chu A.H. , Chen X , Yuan Y.N. , Zhang T , Yohei H , Xu G.C. 
Published: July 2020

Abstract
The power battery is required to have the same service life as the hybrid vehicle. The cylindrical Ni-MH battery 600DC has been used in many HEVs, which was produced by Shona-Corun Energy Co., Ltd (Shona) in Japan. Recently, Shona has been acquired by Hunan Co-power EV Battery co., LTD (CPEV), and an improved and localized 600DE NiMH battery was produced in China. Therefore, it is necessary to study the cycle life of the battery according to the requirements of the real vehicle. The orthogonal experimental scheme based on characteristic conditions including battery temperature, SOC average value, DOD range and average current was designed. According to the periodic assessment during the aging cycle and the physio-chemical analysis after the aging cycle, it is proved that the depth of DOD has a significant impact on the life aging. The main factors of the performance degradation of the battery are the pulverization and corrosion of the negative alloy, the reduction of the active material Ni (OH)2 and the production of the inert material Ni2O3H in the positive electrode.
Experimental Analysis on Flexural Performance of Fair-faced Recycled Concrete Beams
Authors: Fang Xiaojun , Fang Guangxiu , Hu Pengjie , Liang Xiaoxu 
Published: July 2020

Abstract
This paper mainly studies the mechanical properties of fair-faced recycled concrete beams when different recycled aggregates replace natural aggregates and fly ash replaces cement in equal amounts. Through experiments, the crack development law and failure mode of fair-faced recycled concrete beams are first studied. Secondly, the curve equation of load and deflection and the relation curve of load and stress are obtained. Finally, the normal section bearing capacity obtained from the test is compared with the normal section bearing capacity calculated according to the current national code for concrete structure design, and the correction coefficient of the code formula is proposed, which provides reference for the research and engineering application of similar fair-faced recycled concrete beams in the future.
Summary of VOCs Treatment Technology in Product Oil Depot
Authors: Yang Shen-Jun , Liao Xiao-Hua , Dou Ming-Yuan , Feng Qing , Li Hao-Ming , Zou Shuai 
Published: July 2020

Abstract
With the continuous development of social industry and economy, environmental problems are increasingly prominent. The problem of VOCs emission treatment needs to be solved. This paper introduces the source and harm of oil vapor produced in oil depot, and expounds the treatment measures of VOCs. The treatment measures of storage tank are introduced. The principle and research progress of four kinds of recovery processes are described. The development mode and research direction of VOCs treatment in oil depots in the future are prospected, the importance of oil vapor recovery is pointed out, and the recovery technology of VOCs should be developed in the direction of intelligence, integration, miniaturization and energy saving.
Characteristics and design key points of small CIGS solar UAV
Authors: Feng Shaojun , Li Penghai , Xue Yuming , Gao Fan , Bai Zilong , Zhang Liming , Guo Qing 
Published: July 2020

Abstract
Based on the working mode of small CIGS solar UAV, the difference and basic characteristics between its energy power system and traditional UAV are analyzed. Some key problems to be solved in the miniaturization design of flight platform are studied from airfoil selection, aerodynamic layout design and basic parameter calculation. By increasing the power factor of the airfoil and reducing the wing load, the UAV can get a smaller sinking rate. In addition, through the coupling of energy system and power system and the use of new composite materials, the overall efficiency can also be improved and the endurance of solar UAV can be effectively extended. Combined with the intelligent flight control system, it can realize full autonomous over the horizon long-time flight. The main conclusions can provide reference for the miniaturization design and optimization of solar UAV.
Study on Dielectric Material for Generating Ozone by Dielectric Barrier Discharge
Authors: Du Zhehua , Lin Xin 
Published: July 2020

Abstract
Dielectric barrier discharge is mainly used to produce ozone in industry. The dielectric plays an important role in this form of discharge. Because of their good physical and chemical properties, some kinds of ceramic material and enamel material have been studied and applied as the dielectric. Experiments show that as frequency increases, dielectric constant and loss anlge tangent of all ceramic samples decrease. For samples with larger dielectric constant, dielectric constant decreases faster, and the magnitude of the decrease is larger. When the frequency is high, dielectric constant and the loss angle tangent basically stabilize. At the same frequency, the loss angle tangent of ceramic samples with high dielectric constant is also higher. The dielectric constant and loss angle tangent of different ceramic samples differ greatly at low frequency, while the difference is relatively reduced at high frequency. From the perspective of electrical performance, ceramic dielectrics are not much superior to enamel dielectrics. Enamel material is more advantageous than ceramic material.
Experimental Study on the Vibration Characteristics of Oil Tank Model of Oil-Immersed Transformer
Authors: Ma Yuchao , Wan Wei , Mo Juan , Li Xiang 
Published: July 2020

Abstract
The problem of vibration and noise of transformers in urban substations is more and more concerning to society. With a 110kV transformer substation as the research object, the oil tank model of the oil-immersed transformer is designed according to the principle of similitude. Through the modal test of the oil tank model, the vibration characteristics of a 110kV oil-immersed transformer model are obtained, which will help avoid the resonance frequency in the structure design of transformer oil tanks and provide measured data for the vibration and noise control design of transformers. Finally, the finite element model of transformer oil tanks is established, and the vibration characteristics of the oil tank are simulated, and consistent analysis results are obtained.
Design of anti-collision device of mine trackless rubber tire vehicle
Authors: Du Chunhui 
Published: July 2020

Abstract
For the problem of safety accident such as the collision between equipment or between person and equipment beneath the coal mine, after analyzing the advantages and disadvantages of active safety technology now, a high precision ranging system based on UWB has been designed. This system uses Symmetric Double Sided Two-Way Ranging algorithm which can reduce the influence of clock drift, improve the ranging accuracy of the system and reduce the false alarm rate of the system. The device has the functions of personnel intrusion alarm, vehicle approach alarm, automatic shutdown of the vehicle, and so on. The results show that the maximum ranging error of the system within 20 m is ±0.13 m, which can fully meet the requirements of vehicle active safety collision avoidance. Through the research and application of preventing intrusion and proximity alarm devices, the collision accidents between vehicles and personnel as well as those between vehicles and vehicles are effectively avoided. The safety of underground personnel is improved, and the efficiency of underground auxiliary transportation is also improved.
Research and development of frost resistance of concrete filled steel tube
Authors: Dou Lijun , Yang Yanqi 
Published: July 2020

Abstract
This paper mainly introduces the general situation of research on the frost resistance of CFST in China in recent years, expounds the mechanism of the frost damage of CFST and the main factors affecting the frost resistance of CFST, and further discusses the existing problems and defects in the existing research. In order to improve the frost resistance of CFST, some reasonable suggestions are put forward to provide theoretical support for practical projects.
Study on control scheme of on-line measurement system for key dimension of spinning head
Authors: Jin Mingzhi , Min Min , Lin Xuehui , Liu Hongjiao 
Published: July 2020

Abstract
According to the basic principles of roller measurement and displacement measurement, the on-line measurement system of the outer circumference and roundness tolerance and its control scheme are discussed. To implement automatic and real time measurement of circumference and roundness tolerance, the S7-200 PLC is selected as the controller, the STEP7-Microwin V4.0 is used for programming, the ladder diagram is used as the programming language. The motion simulation test of the measurement system is carried out, and the results show that the control scheme is feasible.
Preliminary of finite element analysis (FEA) investigation on the stent expansion
Authors: Lazim Zulfaqih , Ismail Al Emran , Taib Ishkrizat 
Published: July 2020

Abstract
The requirement of stent expansion is important to stent deployment on the inner of the defected blood vessel. This defected blood vessel decreases in lumen diameter size because of accumulation of fat or plaque and caused the reduction of blood flow and oxygen supply to overall body. According to clinical guidelines, blood vessel that blockage by 70% need to be stenting. Stent expand past it elastic limit and plastically deform until the targeted diameter is achieved. Explicit dynamics Finite Element Analysis (FEA) was used in this paper to analyse the stent expansion process. The knowledge of stent radial displacement could prevent the injury of inner surface of artery while understanding on longitudinal foreshortening that aided the stent placement on targeted artery location. The controlled variable was geometry, material and boundary condition of stent. The manipulated variable was the speed of pressure application. The outcomes of this stent expansion simulation are maximum radial expansion, the uniform of radial displacement and longitudinal foreshortening. This simulation results help to improve stent installation on human body for balloon expandable stent and increase the understanding of explicit dynamics structure simulation of finite element in biomedical application.
Physical Properties and Hardness of Treated Amorphous Silica as Reinforcement of AA7075 Recycled Aluminum Chip
Authors: Mohd Joharudin Nurul Farahin , Latif Noradila Abdul , Mustapa Mohammad Sukri , Badarulzaman Nur Azam , Mahmod Muhammad Faisal 
Published: July 2020

Abstract
Solid state recycling techniques of waste aluminum materials without melting the material is a process that consumed less energy consumption. The reuses of waste materials such as aluminum scrap and rice husk ash lead to the friendly environmentally and low cost of production. Physical properties and hardness of treated amorphous silica as reinforcement of AA7075 recycled aluminum chip were investigated. Recycled aluminum sample AA7075 reinforced treated amorphous silica by rice husk ash was prepared by the technique of powder metallurgy (PM) owing of reduced energy consumption and operating cost in comparison with conventional cast-recycling. The presence of silica exists in rice husk ash obtained after through chemical treatment and burning process of rice husk at temperatures of 700°C for 2 hours. The effect of aluminum recycled chip with rice husk ash composite with composition of 2.5 wt.%, 5 wt.%, 7.5 wt.%, 10 wt.% and 12.5 wt.%, on physical properties and hardness were investigated. Based on investigation to AA7075 recycled aluminum chip reinforced treated amorphous silica by rice husk ash, the porosity and water absorption of composite of metal matrix is increase with increasing of composition of treated rice husk ash as the density shows decrease when the treated rice husk ash is added up to 5 wt.%. The addition of treated rice husk ash has improve the hardness of composite of metal matrix from 53.49 Hv of 100 wt.% of AA7075 recycled aluminum chip to 69.53 Hv of composite of metal matrix at 10 wt.% of composition of treated rice husk ash. Based on this research, treated amorphous silica as reinforcement has enhance the physical properties and hardness of recycled aluminum chip sample in composition up to 10 wt.% of treated amorphous silica.
Optimization of Acoustical Properties Polyurethane (PU) Wood Fibres Foam Composites
Authors: Wahab Hanani Abdul , Rus Anika Zafiah M. , Moen Ahmad Tajuddin , Ngadimon Khairul Nizam , Noor Fazimah Mat 
Published: July 2020

Abstract
In this study, an optimization approach was proposed to improve acoustical behaviours of PU foams. The important parameters of PU foams: content of the combination of renewable monomer and epoxy as polyol, methylene diphenyl diisocyanate (MDI) as crosslinker. Their effects on sound absorption coefficient of PU foams were studied by using Taguchi methods. In addition, wood fibres were incorporated into PU foams as fillers to improve the acoustical properties of PU foams. Three controlled factors: the monomers, wood fibres and sample thickness with three levels for each factor were chosen and Taguchi method based on orthogonal array L9 (33) was employed to conduct the experiments. Based on the results of Taguchi’s orthogonal array L9 (33), signal-to noise (S/N) analysis was used and developed to determine an optimal formulation of PU wood fibres foam composites. The results showed that the noise reduction coefficient (NRC) had showed an increased value from 0.4850 to 0.5550 positively improved the acoustic property and the best combination values of variables were monomer mixture of 25 gram, filler ratio of 3% wt and sample thickness of 30mm.
Characterization of Continuous Gradient Functionally Graded Natural Fiber Reinforced Polymer Composites
Authors: Jamaludin M I H , Jamian S , Awang M K , Kamarudin K A , Nor M K Mohd , Ismail A E 
Published: July 2020

Abstract
In this study, cylindrical tubes of functionally graded natural fibre reinforced polymer (FGNF/epoxy) composite are fabricated using horizontal centrifugal casting method. Natural fibres (NF) used in this research are coconut coir and oil palm empty fruit bunch (OPEFB). Natural fibres are mixed with epoxy at four different compositions which is at 0%, 5%, 10% and 15%. The study aims to determine the mechanical properties and microstructure of the FGNF/Epoxy composites. In this method, a homogenous mixture of epoxy liquid and natural fibres is inserted into mould simultaneously. Then, the mould is rotated at a constant speed for 4 hours. Effect of this process, the natural fibres particles in epoxy liquid move radial during mould rotation. Hardness and compression test are carried out to characterize the FGNF/epoxy cylindrical tubes. The microstructures of the composites are observed using optical microscope (OM) and scanning electron microscope (SEM). From the microstructural observation, it is found that the natural fibres particles can be graded from inner to outer surfaces of the FGNF/epoxy cylindrical tubes. The hardness value of the outer part of the FGNF/epoxy fabricated is higher than the middle and inner parts. Besides, from the compression test it shows that epoxy reinforced NF give a better result in strength compared to specimen without reinforced NF. However, the strength value decrease when the fibres percentage increase more than 5%. FGNF/epoxy with 5% NF content gives a balanced composition to have high hardness value and strength.
Synthesis and molecular docking study of 6-chloropyrazine-2-carboxylic acid derivatives
Authors: Aijijiyah Nur Pasca , Ghulam Fahmi Muhammad Riza , Fatmawati Sri , Santoso Mardi 
Published: July 2020

Abstract
One of the most lethal and frequent infectious diseases worldwide is tuberculosis. Multi and extensively tuberculosis drug-resistant constitutes a serious problem and emphasizes the need for novel anti-tubercular agents. Accordingly, various pyrazine-2-carboxamides were synthesized and evaluated as potential anti-tuberculosis agents. The synthesis involved reaction of pyrazinoic acids with thionyl chloride to yield acyl chlorides which on treatment with various anilines gave various pyrazine-2-carboxamides. Based on structure-activity relationships extracted from previously published, this paper reported the synthesis and molecular docking study of 6-chloropyrazine-2-carboxamides. Synthesis involved reaction of 6-chloropyrazinoic acid with 2,4,6-trichlorobenzoyl chloride instead of thionyl chloride which listed under the Chemical Weapons Convention as it may use for the production of chemical weapons. Structure identification of 6-chloropyrazine-2-carboxamides was carried out by 1H NMR, 13C NMR, FTIR, and high-resolution mass spectroscopy. It is predicted that 6-chloro-N-octylpyrazine-2-carboxamide has better bioactivity against Mycobacterium tuberculosis, based on molecular docking study.
The Potency of Antioxidant Perfume of Essential Oils to Reduce Free Radical Content in Air
Authors: Deshinta Selena B , Cahyo F A D , Aggreini G D , Utomo Edi P , Tazi I 
Published: July 2020

AbstractFree radical contamination is very dangerous for health. Perfume contains essential oils whose components are potential as antiradical. Antioxidant perfume is a perfume made from essential oil with a certain concentration which is very effective to reduce free radicals in the air. This study aims to determine the effectiveness of essential oils as antiradical compounds using laboratory experiments in the reduction of free radical concentration of DPPH with various concentrations of fruit extract which containing terpenoid component. DPPH concentration changes in the air followed by using electronic nose (E-Nose) equipped with multisensory gas. The experimental results showed that the critical concentration of fruit extract which effectively decreased free radical i.e. apple, orange, grape, melon, and lemon were 7.47%, 6.21%, 15.61%, 7.58%, and 6.22%. The greater concentration of these critical concentrations of fruit extracts is potentially as prooxidants.
Physicochemical Properties and Antibacterial Activity of Castor Oil and Its Derivatives
Authors: Fitranda M I , Sutrisno  , Marfu’ah S 
Published: July 2020

Abstract
Castor oil is vegetable oil sourced from castor seeds (Ricinus communis Linn). The main content of fatty acids in castor oil are ricinoleic acid (92%), oleic acid (3.53%), linoleic acid (2.90%), stearic acid (1.02%), and myristic acid (0.55%). Research on the antibacterial activity of castor oil and ricinoleic fatty acid has been carried out but for the K-soap and fatty acids methyl esters of castor oil have not been conducted. This research aims to produce castor oil derivatives, namely K-soap, free fatty acids (FFAs) and fatty acids methyl esters of (FAMEs) and evaluate their antibacterial activity. The results of the study included (1) K-soap (solid, white, melting point 168–175°C), (2) free fatty acids (liquid, yellow, boiling point 210°C, density 0.98 g.mL−1, refractive index 1.46, viscosity 693.22 cSt, and the value of acids, saponification, and esters are 145.88, 294.52, 148.64), (3) fatty acids methyl esters (liquid, yellow, boiling point 170°C, density 0.98 g.mL−1, refractive index 1.46, viscosity 27.31 cSt, and the value of acids, saponification and esters are 0.33, 392.7, 392.37). K-soap, free fatty acids, and methyl esters from castor oil have antibacterial activity against Escherichia coli and Staphylococcus aureus bacteria.
Antibacterial activity of Achromobacter sp. and Bacillus sp., bacterial endophytes derived from Mangrove Ceriops tagal (Perr.) C.B.Robb
Authors: Haryani Yuli , Hilma Rahmiwati , Delfira Noviza , Martalinda Tetty , Puspita Fifi , Friska Amelia , Juwita Dita , Farniga Analdi , Ardi Fri 
Published: July 2020

Abstract
A total of 95 bacterial endophytes have been isolated from mangroves plant in Bengkalis coastal area, Riau Province, Indonesia. Mangrove plant samples were identified as Bruguiera sp. and Ceriops tagal (Perr.) C.B.Robb. Antagonism study showed that 4 out of 95 isolates were possessed antibacterial activity based on their ability to inhibit the growth of Vibrio alginolyticus and Staphylococcus aureus; while none of them was able to inhibit Escherichia coli. According to the results of 16s rRNA genes amplification, the closest species relative of the 4 active isolates was Achromobacter insolitus (isolate no. 34), Bacillus siamensis (isolate no. 39), and Bacillus subtilis (isolate no. 88 and 89). This is the first report on bacterial endophytes associated with Mangrove in Riau Province, Indonesia.
Antifungal Activity of Red Dragon Peel (Hylocereus polyrhizus)
Authors: Hendra Rudi , Masdeatresa Lidya , Almurdani Muhammad , Abdulah Rizky , Haryani Yuli 
Published: July 2020

AbstractRed dragon fruit (Hylocereus polyrhizus) is a species of plant that provides natural pigment which is betalain. Betalain is one of the pigments that give a natural color to flowers and fruits. Moreover, of betalain in red dragon fruit peel, there is a bioactive compound such as polyphenol and flavonoid with antioxidant and antifungal activities. This research was objected to extract pigments and other secondary metabolites from red dragon fruit peel using ethanol, methanol, dichloromethane, and ethyl acetate solvents, continued with determined potential activity againstCandida albicansby using Resazurin Microtiter Assay (REMA) method. Furthermore, total phenolics compounds (TPC) and total flavonoid compounds (TFC) were determined from all the extracts. The results of antifungal activity showed various inhibition percentage against the fungal at 500 ppm. The ethyl acetate showed the highest activity among the extracts with 74.27% inhibition followed by pigment extracts (60.88%). Furthermore, from test TPC and TFC determination, the ethyl acetate possessed the highest amount with the value of 34.38 mg gallic acid equivalent/g fresh weight and 28.62 mg quercetin/g fresh weight, respectively. Therefore, to find the active compounds, multiple analysis is needed.
Phytochemistry and Antibacterial Activity Evaluation of Genitri (Elaeocarpus ganitrus)
Authors: Indriatie Retno , Mudaliana Siti , Hapsari Febriyana Rizky , Masruri Masruri 
Published: July 2020

AbstractTheElaeocarpus ganitrushas local name as genitri. It has been used traditionally as traditional medicine. This paper reported the phytochemistry and their antibacterial activity onStaphylococcus aureusandEscherichia coli. Several extracts have been afforded using high speed extraction technique using methanol, ethyl acetate and n-hexane as solvents. The extract is composed of alkaloid, tannin, and flavonoid. The negative result is afforded for saponin test. The MIC of all extracts in both bacteria are above 10 mg/mL. Moreover, the quantitative analysis using spiking method using liquid chromatography found a quercetin and rutin in minor quantity of some sample extract.