bluuebunny/crossref_metadata_2025_split huggingface dataset:
Implementation Of Multi Factor Evaluation Process (MFEP) In Assessment Of Employee Performance Achievement
Authors: Limbong Tonni , Simarmata Janner , Rofendi Manalu Mamed , Rikki Alex , Rajagukguk Denni M 
Published: July 2020

Abstract
Human Resources is one of the competitive advantages and key elements that are important for success in competing to achieve goals. Therefore, which is an element of management in which there are manpower and other resources. Humans are always active and dominant in every activity and organizational activity. The purpose of a company is not possible without the active role of employees. Then the performance appraisal is a function of motivation and ability. To complete a task or work someone duly has a certain degree and level of ability. This study discusses how to make a selection in the case of selecting an employee who is performing and performing well. MFEP is a method to get the best solution from several alternative solutions by using ‘pairwise comparison’ as a basis for making choices. The Multi Factor Evaluation Process (MFEP) method is also described as a comparison. Based on performance appraisals, conclusions can be drawn which explain that employee performance appraisal in an organization is an important mechanism for a manager or leader.
Implementation Of Triangle Chain Cipher Algorithm in Security Message of Social Media
Authors: Tarigan Pilipus , Sunandar Hery , Sinuraya Bersama , Arizona Matondang Zekson , Ginting Garuda 
Published: July 2020

Abstract
Messages sent on social media can be seen or used and obtained by others. Given the current many types of text messages that must not be known by others, or secret messages. Because social media is free, users cannot request security facilities for their messages. The triangle chain cipher algorithm is one of the encryption algorithms that operates based on classical encryption (cryptography), especially in character substitution techniques. Each character will be substituted based on the key and multiplier that has been determined based on the formula that applies in this algorithm. This algorithm encodes text messages twice and always depends on the results of the previous process. This is what underlies the complexity of solving this encryption coding algorithm. Encoding of messages especially in text messages is one of the most important things to do in improving the security of text messages from various levels of crime committed by people who are not entitled and not responsible. The implementation of the triangle chain cipher algorithm in encrypting text messages can make it difficult for anyone who is able to access and obtain text messages to understand and understand, damage, distribute, steal text messages or other actions that can harm the parties to the text message.
Optimization Of Fuel Tankering And Cargo Maximization At Garuda Indonesia Airline To Gain Profitability (Study Case Of Route Cgk-Sub)
Authors: Wulandari A , Sari W P , An C , Firdaus M I 
Published: July 2020

AbstractFuel is a considerably high cost component in aviation operations. One of the ways to cost savings of an aircraft expense is Fuel Tankering. Fuel Tankering is an additional fuel carrying procedure aimed at obtaining cost savings by resorting to the price gap between departure and arrival airport, as well as minimizing risk. In reality, Fuel Tankering strategy in some airlines is still not favorable. Thus, companies must be able to weigh up expenditures and revenues. Therefore, there is a need for the estimation of fuel tankering and cargo maximization in the aircraft, so that Flight Operation Officer has a reference in estimating the defined formulations. The purpose of this research is to optimize Fuel Tankering and cargo maximization of airline company. It is expected that upon the strategy application within Indonesian airlines, there will be a significant and profitable operations.
The Impact of Online Motorcycle Fare on Customer Satisfaction
Authors: Ryan V D , Crismonika E , Marina S , Rahmawati A 
Published: July 2020

Abstract
The upturn of internet technology presents a practical and low-fare online motorcycle taxis service which becomes a solution under a high demand of Indonesian society regarding traffic issue. Fare strategies continue to be carried out by the online transportation companies in order to create customer satisfaction and to win the competition. This research aims to find the impact of Grab-Bike fare offered towards the students of Management and Business Faculty, Institute of Transportation and Logistics Trisakti. The method used in this research is survey by distributing questionnaires to 100 respondents. The using of standard regression linear analysis technique aims to examine hypothesis with the support of SPSS software. The result of this research is showing that Grab-Bike fare positively and significantly influenced the satisfaction of the students of Management and Business Faculty, Institute of Transportation and Logistics Trisakti.
Acoustic properties of materials: a comparison of numerical and experimental methods.
Authors: Viscardi Massimo , Napolitano Pasquale 
Published: July 2020

AbstractAcoustic simulations provide today a valid tool to simulate complex environments and complex interaction between acoustic and structure. Multiple methods are nowadays available with different degrees of accuracy and different applications. Simulation methods cover a wide frequency range with FE methods dominating the low frequency range. SEA mostly covers high frequency range with BEM covering an intermediate frequency range. Ray- tracing can work on the entire frequency range and is used when a large domain must be simulated. These methods require acoustic properties of materials to be implemented such as acoustic impedance or absorption and STL. The aim of this paper is to show different methods to provide these properties and discuss about the equivalence/difference of the numerical and experimental approaches under specific assumptions.
Vision based techniques for the experimental characterization of a prosthetic finger model
Authors: Cosenza C , Niola V , Penta F , Savino S 
Published: July 2020

Abstract
Several prototypes of mechanical fingers composing anthropomorphic prosthetic hands have been developed using underactuated mechanisms. These mechanisms require specific experimental procedure to measure their properties. Due to their low weight, the addition of further sensors for measurement purposes could modify the trajectory of the single parts and the overall prosthetic device behaviour. Vision system methods represent a route to overcome these drawbacks. In this study, an experimental methodology to acquire the dynamics of an underactuated prosthetic finger is presented due to the employment of a vision-based technique, the Digital Image Correlation. The experimental characterization aids the development of a dynamical model of the finger behaviour.
Lean Flame Stabilization by Means of a Coaxial Synthetic Jet
Authors: Di Tommaso R M , Fasanella R , Nino E 
Published: July 2020

Abstract
In the present paper the effect of a synthetic jet, coaxial with an annular type combustor, has been investigated in order to infer aerodynamic interaction between the two gaseous flows. The experimental investigation has the purpose to find the existence of synthetic jet excitation frequency able to extend the stability limits of a lean air/propane mixture flame. Lean flame is widely adopted in low thermal NOx emission combustors. As it is well known for gaseous premixed flame increasing the air/fuel ratio (lean flame) the flame propagation velocity is decreasing until it is getting comparable to the velocity of supplied fresh gaseous mixture. At this point, the flame is flushed away from the combustor mouth and the combustion process is quenched (blow off). In order to avoid those effects, for very low air/combustible ratio the modern premixed industrial combustors control the flame stability by means of the so called “pilot flame”, a small secondary relatively rich flame. The pilot flame, fed by a few percent of the total amount of supplied combustible, represent a relatively high source of thermal NOx. The experimental investigations have been performed by means of a Particle Image Velocimetry (PIV), in order to obtain instantaneous two dimensional velocity distribution overall the entire gaseous reacting jet, in order to stretch the influences of coherent structures generated in the jet, by means of natural aerodynamic effect and by means of perturbation forced into the flow by means of the synthetic coaxial jet under combustion conditions.
The impact of COVID-19 control measures on air quality in China
Authors: Silver Ben , He Xinyue , Arnold Steve R , Spracklen Dominick V 
Published: July 2020

Abstract
The outbreak of Coronavirus Disease 2019 (COVID-19) in China in January 2020 prompted substantial control measures including social distancing measures, suspension of public transport and industry, and widespread cordon sanitaires (‘lockdowns’), that have led to a decrease in industrial activity and air pollution emissions over a prolonged period. We use a 5 year dataset from China’s air quality monitoring network to assess the impact of control measures on air pollution. Pollutant concentration time series are decomposed to account for the inter-annual trend, seasonal cycles and the effect of Lunar New Year, which coincided with the COVID-19 outbreak. Over 2015–2019, there were significant negative trends in particulate matter (PM2.5, −6% yr−1) and sulphur dioxide (SO2, −12% yr−1) and nitrogen dioxide (NO2, −2.2% yr−1) whereas there were positive trends in ozone (O3, + 2.8% yr−1). We quantify the change in air quality during the LNY holiday week, during which pollutant concentrations increase on LNY’s day, followed by reduced concentrations in the rest of the week. After accounting for interannual trends and LNY we find NO2 and PM concentrations were significantly lower during the lockdown period than would be expected, but there were no significant impacts on O3. Largest reductions occurred in NO2, with concentrations 27.0% lower on average across China, during the lockdown. Average concentrations of PM2.5 and PM10 across China were respectively 10.5% and 21.4% lower during the lockdown period. The largest reductions were in Hubei province, where NO2 concentrations were 50.5% lower than expected during the lockdown. Concentrations of affected pollutants returned to expected levels during April, after control measures were relaxed.
Influence of a Baffle and Shaft Spacing on Shaft Exhaust Efficiency
Authors: QianKun Hou , Weng Miao-cheng , liu Fang 
Published: July 2020

Abstract
In road tunnel. A baffle-coupled shaft is used to decrease the plug-holing and boundary layer separation. Install baffle on both sides of the shaft (when the fire occurs upstream of the shaft, the baffle upstream of the shaft closes and the baffle downstream of the shaft opens), it can function as a smoke barrier. In order to study the distance between the baffle and shaft, numerical simulation was performed using the Fire Dynamic Simulation (Version 6.7.1). We use the mass flow of carbon monoxide discharged through the shaft as a basis for evaluating the efficiency of exhausting smoke. As the spacing increases, the exhaust efficiency increases first and then decreases. In this paper, the baffle-coupled is set 2 meters.
The Achievements, Problems and Improvements in the Development of the Rule of Law for Rural Environmental Protection
Authors: Zhijie Yu 
Published: July 2020

Abstract
With the improvement of social development, more and more people attach great importance to the construction of new rural areas and focus on rural economy and the vital interests of farmers. At this stage, the fundamental reasons for rural environmental problems are the imperfect relevant legal mechanism and shortage of environmental protection awareness among rural residents. Thus, whether the rural environment can be improved has become the key to realizing the new rural construction. This paper mainly illustrates the achievements, problems and improvement of legal construction of rural environment protection, so as to improve the current environmental situation in rural areas.
Purification Process Design of Vinyl Acetate Based on Aspen Plus
Authors: Xie Ya Nan , Meng Zhi , Li Fu 
Published: July 2020

Abstract
Based on Aspen Plus process simulation, the purification stage of the production of vinyl acetate by 450000 tons of calcium carbide acetylene process was optimized.The main equipment involved in the process are degassing tower, deacetaldehyde tower, crude separation tower, vinyl acetate refining tower, acetic acid distillation column and so on. The unit operation involved mainly includes general distillation, azeotropic distillation, distillation with side line extraction, absorption, extraction and so on. Aspen Plus sensitivity analysis function is used to analyze and optimize tower parameters such as reflux ratio, the number of theoretical plates, distillate feed ratio, feed position, side line extraction position. The results will provide reference for improving the problems of low purity and energy waste of products.
Effect of water quality on wettability of coking coal dust
Authors: Wang Jinfeng , Zhao Wenbin , Zhao Juan , Liu Bo , Song Lei 
Published: July 2020

Abstract
Water quality has certain influence on the wettability of coal dust, so we studied the wettability of coking coal by reclaimed water and mine water and distilled water. The surface contact angle and forward permeability time of various kinds of water on coking coal dust were measured firstly, the wetting effect of reclaimed water was better than those of other water types. Through infrared spectra analysis, we found that the functional groups contained in reclaimed water promoted the wettability of coal dust to some extent.
Numerical simulation of seepage in the landfill leachate layers
Authors: Li Gang , Zhang Jinli , Liu Jia 
Published: July 2020

Abstract
In order to control the environmental pollution caused by landfill leachate, the numerical simulation of landfill leachate seepage was carry out, which considered the influence of anisotropy of permeability coefficient, the permeability coefficient, matrix suction, infiltration amount of leachate, slope of drainage layer, drainage distance and initial water head on the maximum saturation depth. The results showed that when the horizontal permeability coefficient is fixed and the vertical permeability coefficient is reduced, the maximum saturation depth of leachate increased sharply. The maximum saturation depth linearly increased with the infiltration of leachate, whereas sharply decreased with the increasing of drainage slope. The maximum saturation depth is less affected by small drainage distance, whereas more affected by the large drainage distance. The initial head has a great effect on the maximum saturation depth, and whether the drainage pipe can discharge the leachate or not has an important influence on the maximum saturation depth.
Assessment on Effect of Load Frequency to Durability of Chassis of the Multi-Purpose Forest Fire Fighting Vehicle
Authors: Nguyen Xa Hoi , Van Luong Van , Quang Nguyen Thanh , Tran Van Tuong 
Published: July 2020

Abstract
Chassis is the main structural component of the automobile; it is subject to any damage due to fatigue or destruction during the operation of the automobile. Therefore, it is important to research and assess the durability of the chassis. In particular, studying the effect of load frequency on chassis durability is very important in the assessment of chassis durability. An objective of this study was to investigate the effect of load frequency, from the road surface and engine to chassis durability when the multi-purpose forest fire fighting vehicle operates in some cases when moving on the road. The assessment of the effect of load frequency on the chassis durability of the multi-purpose forest fire fighting vehicle contributes to input parameters for the determination and assessment of fatigue problem and breaking strength of the chassis.
Hybrid Turbo Compound Fan Engine an Eco-Efficient Propulsion System for Aviation
Authors: Berg H P , Himmelberg A , Poojitganont T 
Published: July 2020

Abstract
The path to electric propulsion systems depends on the development of powerful, compact and very light energy storage system with a high storage density. In order to create an environment-friendly intermediate solution in the medium term, especially for aircraft engines of medium power classes, it makes sense to use an innovative, electrically parallel hybrid unit based on rotary engines and electric boosters for start and climb phases as a propulsion system. An aero-engine application, based on the HSD concept (HSD = hybrid super-drive – hybrid Wankel rotary engine) for different hybrid-parallel propulsion systems is presented. In this article, the introduced technology is based on a currently produced family of multi-component Wankel rotary engines. The proposed HSD concept uses a chamber volume of 650ccm per rotor. The projected power range (0.8 to 1.36 MW) is covered by an innovative hybrid electric parallel turbo compound concept together with 2x4 rotary engine units. A novel, air-bearing turbo engine with integrated electric drive is used as a turbocharger for charging the rotary engine. For the aero-engine technology, the counter-rotating fan (CRF) concept shown as an example for an aircraft technology carrier (light jet) leads to a further increase in the efficiency of a complete system.
Simulation and validation of Airflow Past Hand-Shape Mold Using OpenFOAM
Authors: Loksupapaiboon K , Suvanjumrat C 
Published: July 2020

Abstract
This paper aims to present a wind tunnel, aiming to examine the effect of airflow past the hand-shape mold especially airflow around the gap between the fingers of the mold. Part of the aim of this project is to investigate the behavior of airflow past the mold on the different angles, which was valuable to vulcanize rubber glove in the oven. The wind tunnel experiments were performed on the various angle of attack of hand-shape mold from 0 to 180 degrees under the airflow velocity of 5 to 20 m/s. The 3D simulations were carried out by using open source code software, OpenFOAM. The k-? model was used to simulate the turbulent flow past hand-shape mold. The pressure-velocity coupling problem and the convection-diffusion term were solved by using a SIMPLE algorithm and upwind differencing scheme, respectively. The drag force by airflow on the rubber glove mold which obtained by the computational fluid dynamics (henceforth CFD) method was compared with the experimental data. The comparison between CFD simulation and the experimental data showed a fairly close agreement and the average error was less than 13.96%. Further research in this field would be of great help in developing a model to optimize the mold installation inside the rubber glove oven.
A Two-Dimensional Computational Study of a Single Right Trapezoidal Cylinder Subjected to Unsteady Laminar Flow Regime at Low Reynolds Number
Authors: Lamtharn Sodsai , Pimsarn Monsak 
Published: July 2020

Abstract
A right trapezoidal cross-section cylinder is used as guided bars for a barred tee in the long pipeline and piping system to protect the moving of pigs across the branched pipe. The cylinder must have the integrity to withstand to fluid flows-induced vibration which concerns the synchronization between vortex shedding frequency of fluid flows with a natural frequency of the cylinder. Therefore, this article aims to numerically investigate the vortex shedding frequency responses which are in terms of Strouhal number, flow force coefficients and in order to provide additional data for use in the absence of more applicable data for engineering design of the single right trapezoidal cylinder in structural integrity point of view. In this study, the simulation of the single right trapezoidal cylinder immersed in the uniform oncoming laminar flow regime with low Reynolds number; Re = 100, was performed. There are various sharpening angles in this study; defined as angle which is measured from virtual line parallel with height base side to slant side or (90°- acute angle°) of the cylinder, in the range of 0°, 15°, 22.5°, 40° and 60°, accompanying with the cylinder side ratio (B/A) which is the ratio of the longest base side-to-height base side, in the range of 1, 2, 3, 4, 5, 6 and 7. In the simulation, the Direct Numerical Simulation (DNS) with a finite volume method, an incompressible flow and constant fluid properties were employed. The computational results were validated against the published data. The effect of the sharpening angle and side ratio on the response of the single right trapezoidal cylinder were presented and discussed. The Strouhal number and flow force coefficients at fully ten cycle of saturated flow have been calculated. The simulated results show that increasing of sharpening angle, the Strouhal number slightly increases whilst the root mean square lift coefficients significantly increases. Additionally, as the side ratio increases, the Strouhal number and the root mean square lift coefficients decreases.
Surrogate-assisted Meta-Heuristic method for Aerodynamic Design of an Aircraft Wing
Authors: Mar Aye Cho , Pholdee Nantiwat , Bureerat Sujin 
Published: July 2020

Abstract
This paper presents the aerodynamic design of an aircraft wing using a surrogate-assisted meta-heuristic (MH) method. The optimization problem is posed to find the wing shape in order to maximize its lift-to-drag ratio. Two surrogate-assisted MHs are presented which are the use of a surrogate model to predict the objective function directly and using a surrogate model to predict lift coefficient and drag coefficient separately before calculating the objective function. Computational fluid dynamic analysis is used for calculating the values of lift and drag coefficients while a Differential Evolution (DE) algorithm and a radial basis function are respectively used as MH and a surrogate model. From this study, the performance of the surrogate-assisted design approaches for aerodynamic optimization of an aircraft wing is obtained. The attained results are said to be the baseline for future study of surrogate-assisted aerodynamic optimization.