bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of fuzzy preference relations method in AHP to improve judgment matrix consistency
Authors: Hamka M , Harjono  
Published: May 2020

Abstract
Most issues when using AHP is the difficulty of getting the consistency of a judgment matrix. It can be affected due to decision-making subjectivity. This study proposes the usage of the fuzzy Preference Relations (FPR) method to ensure a judgment in decision-making is acceptable and high objectively due to its obstacle for satisfying consistent judgment matrix from decision-makers in AHP. Improving the consistency of decision matrix can be done through the following steps, namely: 1) Transform pairwise comparison matrix of A=(a_ij) into FPR R=(r_ij ), 2) construct a new consistency matrix of FRP which satisfies the additive consistency, and 3) compose a new consistent pairwise matrix. As a result, the consistency index value was acceptable (< 0.10). Moreover, the procedure is applied in the determination of agro-industries based SMEs development.
Correlation of risk factors for coronary heart disease in type-2 diabetes mellitus using the chi-square method
Authors: Syafaah L , Arisnanda D , Irfan M , Hendaryati R H 
Published: May 2020

AbstractThe male sex is taken into account a crucial risk issue for coronary heart disease (CHD) within the general population, however, studies on diabetic patients counsel that diabetic girls have a better risk of developing CHD. This study was to determine whether there is correlation between risk factors and the incidence of CHD in patients with type 2 DM. Furthermore, this work also investigates the mathematical model work in calculating the magnitude of the risk of variables against the tendency of CHD complications for patients with type 2 diabetes. This research utilizes current information on the setup of Dr. Soetomo Hospital’s medical records in 2015-2016. Samples were all patients with type 2 diabetes with CHD and without CHD reported in the inpatient medical records of Dr. Soetomo Hospital Surabaya. Data processing was carried out using the chi-square test technique. As a result, the system is proof to calculate the worth of the chi-square and confirm the results of conditions on every variable. There is a distinction in price between the calculations of the chi-square on the system with the calculation of the manual chi-square test. This is often caused by taking variety of digits behind completely different commas (,). The variables of gender, age, GDA, GDP, GD2PP, triglycerides, HDL, weight, smoking, and length failed to have a significant relationship on the incidence of CHD in patients with sort two DM. Sterol variables and lipoprotein levels have a highly vital relationship within the incidence of CHD for patients with sort two polygenic disease.
First time user experience of academic information system: An evaluation of usability
Authors: Setiawan A , Primadewi A 
Published: May 2020

Abstract
The use of information technology continues to grow, one of which is software development. The software does not only focus on functionality, but the ease of use becomes a heuristic development. The interface design cannot be underestimated because the wrong interface design can also result in repeated software development from an initial stage. Software development from the start is certainly not easy and time-consuming to revise it. The specific purpose of this study is to adapt various models of usability testing instruments to measure how easy it is to use the system being tested. This research aims to help the designer evaluate what he has designed. The first stage is the validation of the first user experience instrument of the Academic Information System Universitas Muhammadiyah Magelang. The results of this study found that the KRS system was able to be well received by the first user.
Implementation and design gas leakage detection system using ATMega8 microcontroller
Authors: Evalina N , A Azis H 
Published: May 2020

Abstract
In Indonesia and many countries for economic reasons and green energy LPG is widely used for cooking. This paper show implementation and design gas leakage detection system. The main objective of the project to build a gas LPG leakage detector using an LPG gas sensor and micro-controller. It developed a security system by providing an early Warning System to give a sign if there is a smell of gas around Home. If this system has been the existence of leakage and smell of LPG gas, then the system will give a sign of alarm or buzzer where if there is leakage of gas that smelling the LPG system will work and the early warning alarm of the system. That the presence of gas leakage signals on the sensors to work, the MQ-6 is the gas Sensor used to detect leakage gas LPG. The tool is designed to detect gas leaks that are then legible on the LCD screen and alarm, and in certain circumstances, the buzzer will sound. This MQ-6 sensor test is performed by measuring the sensor output with the Atmega8 microcontroller when the LPG gas is detected and then writes it on the LCD screen. This test was conducted to determine the contribution of the MQ-6 sensor. It becomes essential to protect gas leakage from damage and accident.
Structure Analysis of an Innovative Vertical Axis Wind Turbine with Inclined Pitch Axes using Finite Element Method
Authors: Guo Jia , Zeng Pan , Lei Liping 
Published: May 2020

Abstract
Pitch regulation is critical to power performance of wind turbines. However, the complexity of the conventional pitch system of vertical axis wind turbines (VAWTs) retards its appliance. In the present study, an innovative pitch system of a VAWT with inclined pitch axes was proposed where a slider in the main shaft actuated upwards or downwards drives blades to be folded by linkage mechanisms. Effect of design parameters of the pitch system on blade folding movement control sensitivity was evaluated. Loads of pitch hinge, deformation of blades and stresses of components were analyzed as well as natural frequencies of the wind turbine with various azimuth and fold angles under rated operational conditions by finite element method and effect of design parameters on structural performance of the wind turbine was investigated. It was found that deformation of blades and stresses of supporting arms deteriorated but natural frequencies of the wind turbine increased when blades were folded in the negative direction. In addition, the increasing arm interval height improved structural performance with the increasing natural frequencies. In the contrary, the decreasing blade linkage length, shaft linkage length and slider height improved structural performance with the decreasing natural frequencies. This study laid the foundation for the further design optimization of the novel pitch system.
Simulation Study on Flow-induced Vibration Characteristics of Multi-nozzle Ejector
Authors: Yisheng Yang , Zongzheng Liu , Xiqiang Yan , Hequan Jia 
Published: May 2020

Abstract
The ejector is an important power source for intermittent wind tunnel. In order to accurately predict the flow-induced vibration (FIV) response, numerical simulation based on fluid-structure coupling method was carried out. Firstly, three-dimensional unsteady constant simulation on the flow field of ejector was done, using the renormalized k-ε model. The ejector inlet and outlet mass flow were basically consistent with design, and the relative error of Mach number in the third-stage nozzle was 1.79%. Secondly, in the one-way coupling simulation, the MPCCI software was performed. Thirdly, the calculated vibration spectrum was obtained. The simulation results could be found in good agreement with experiment, and the domain frequency relative error was 4.27%.
Appling TRIZ Theory in Ship Overall EMC Design
Authors: Cheng Xiangxiang 
Published: May 2020

Abstract
Same frequency interference between electronic equipment still cannot be wiped out, which leads electromagnetic compatibility (EMC) system engineers to the one and only way by making an EMC rule to manage and control all the equipment onboard. However, while the sensors are following the EMC rule in battle, the weapons’ maximal combat capability is usually not able to be attained. Therefore, EMC management and control widely used in today’s ship engineering design is actually a compromise. This paper presents an unconventional design method combining the TRIZ methodology into traditional EMC design methods. The proposed method used TRIZ tools such as function analysis, causal analysis, ideal solution analysis and resources analysis to make deep analysis of the same frequency interference problem on ship. The final solution is obtained through contradiction resolution theory, Su-Field analysis and 76 standard solutions in this paper. At the end, a few enlightening ideas are harvested for the engineering innovative design problem.
Numerical Smulation of Radial Compression and High-temperature Creep of Metal Elastic Elements
Authors: Chang J , Cai Y , Peng L , Yang L , Liu H , Li H 
Published: May 2020

Abstract
With the help of the numerical calculation method—Finite Element Method, the numerical simulation and result analysis of a kind of metal elastic element-knitted spring are carried out, mainly focusing on the radial compression and high temperature creep behaviours of the spring. The purpose of this study is to analyse the previous with numerical simulation and explain the influence of configuration parameters on its mechanical properties and to provide data support for design, manufacture and application of the prepared material as an elastic component.
A Resonant Pressure Sensor based on Magnetostrictive/Piezoelectric Magnetoelectric Effect
Authors: Liu Lunan , Yang Yikun , Yang Bintang 
Published: May 2020

Abstract
This study proposed a resonant pressure sensor based on magnetoelectric effect induced in magnetostrictive/piezoelectric materials. Due to the magnetoelectric effect, the resonant frequency of the sensor varies as the external applied pressure changes. By studying the nonlinear constitutive parameters of the magnetostrictive material and adopting the equivalent circuit method, the sensor is theoretically analysed and the relationship between the resonant frequency and applied pressure is determined. The prototype of the sensor is optimized based on theoretical model. Optimal parameters of the sensor are determined to ensure high sensitivity. The measurement range of the sensor is 0-360 kPa and experimental studies show that the sensitivity reaches to 11.63 Hz/kPa. The experimental result is in good agreement with theoretical analysis. It can be concluded that the pressure measurement method based on magnetostrictive/piezoelectric magnetoelectric effect is of robustness and accuracy. Analysis shows the proposed mechanism also has the potential in mass measurement.
The Design of Hardware System of High Precision Dynamic Flow Controller
Authors: Chen Jie , Cheng Shuo , Li Bin , Gou Yang , Fan Xinghang 
Published: May 2020

Abstract
At present, the dynamic flow controller produced in China cannot meet the demand of pharmaceutical, food, beverage and other industries in terms of its precision. Therefore, a high precision dynamic flow controller detection device is designed to improve the control accuracy of the dynamic flow controller. The device also has the function of flow calibration. The experimental results show that the high-precision dynamic flow controller detection device designed in this paper has a great improvement in the control accuracy of dynamic flow controller and can realize the high-precision calibration function of the tested flowmeter.
Theoretical exploration on free radical scavenging mechanism of curcumin analogues in water solvent
Authors: Boli L S P , Aisyah N D , Khoirunisa V , Rusydi F , Rachmawati H , Dipojono H K 
Published: May 2020

Abstract
One way to improve curcumin’s possibility in preventing lipid peroxidation is through modification of carbon linker, β-diketone group and aromatic rings. However, there remains a need to explore the role of carbon linker on the free radical scavenging mechanisms of curcumin. This study uses density functional theory to explore two descriptors of free radical scavenging mechanisms, which are bond dissociation enthalpy (BDE) and adiabatic ionization potential (AIP) of curcumin and its analogues. Five analogues with different amount of carbon atoms in the linker in the presence / absence of β-diketone group are chosen. Our result shows that decreasing the amount of carbon atom from 7 to 5 atoms in the linker decreases the BDE at β-diketone group of the curcumin analogue. Moreover, increasing the amount of carbon atoms in the linker decreases the AIP of the analogues.
Carbon nanotube reinforced aluminium composites fabricated by powder metallurgical and hot-rolling techniques
Authors: Tsukamoto Hideaki 
Published: May 2020

Abstract
This research aims to fabricate light weight and high strength materials such as multi-walled carbon nanotubes (CNT) reinforced aluminium composites at relatively low cost. CNT/Al composites have been fabricated in three steps: (1) preparation of CNT dispersion, (2) preparation of CNT/Al based composite material by powder metallurgical slurry method, and (3) strengthening and refining of CNT/Al based composites by rolling processes. After fabrication, the composites have been characterized on dispersibility of CNT, Vickers hardness, three-point bending and tensile properties.
Synthesis and antiparkinsonian activity of nanocomposite of chitosan-tripolyphosphate-Mucuna pruriens L extract (CS-TPP-MP)
Authors: Sardjono R E , Fauziyah A N , Puspitasari M D , Musthapa I , Khoerunnisa F , Azzahra G N , Mamat R , Erdiwansyah  
Published: May 2020

Abstract

Mucuna pruriens L. (MP) has antiparkinsonian activity because it contains levodopa that acts as a dopamine precursor and plays a role to stimulate dopaminergic receptors in Parkinson's sufferers. The therapeutic efficacy of MP extract can be improved by using a nano drug carrier system, such as chitosan-tripolyphosphate (CS-TPP). This study aims to synthesize, characterize, and evaluate antiparkinsonian activity of chitosan-tripolyphosphate-MP extract (CS-TPP-MP) nanocomposite in mice. MP seed powder was extracted by maceration method using water-ethanol (1:1) by adding citric acid until it reached pH 3. The CS-TPP-MP nanocomposite was synthesized by using ionic gelation method with variations in reactant composition and reaction time. The CS-TPP-MP nanocomposite was characterized by Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX), X-Ray Diffraction (XRD) and Fourier-Transform Infrared (FTIR) Spectroscopy. Catalepsy test was performed to find the antiparkinsonian activity level of CS-TPP-MP nanocomposite at doses of 5, 10, 15, 20, and 25 mg/kg body weight. Based on the results of CS-TPP-MP synthesis, it was found that the reactant composition (CS-TPP:MP) of 1:3 with reaction time of 20 minutes produced the highest yield (14.21%.) SEM-EDX characterization showed that the morphology of CS-TPP-MP nanocomposite was predominantly spherical and the size was approximately 120-170 nm with a composition of C = 55.43%, O = 30.46%, N = 13.46%, P = 0.44%. XRD diffractogram showed that CS-TPP-MP nanocomposite has amorphous structure. FTIR analysis showed the appearance of absorption at wavelength of 1643.35 cm−1 which proved the interaction between the primary amine group of chitosan and the carbonyl group of EMP. Catalepsy test demonstrated that CS-TPP-MP nanocomposite at the doses of 5, 10, 15, 20, and 25 mg/kg body weight could reduce catalepsy symptoms in mice significantly, and the best dosage was 20 mg/kg body weight.
Analytical Description of the Kinetic Processes of Forming the Properties of Composites
Authors: Garkina Irina , Danilov Alexander 
Published: May 2020

Abstract
Effective methods are proposed for approximating the kinetic processes of formation of physical and mechanical characteristics of composite materials for solving problems of both single-criterion and multi-criteria optimization of their structure and properties. The approximation of kinetic processes on a given interval with the definition of partial intervals of the maximum length approximation is considered in detail. An approximation algorithm on cubic splines is given. To determine the transfer functions of composites, as dynamic systems with many inputs and outputs, it is recommended to use Laguerre polynomials. The possibility of a cognitive approach is also not excluded with the direct selection of the form of the approximating function.
Tuning Polymerization Rate Program Block Copolymer Assemblies in PISA: A Simulation Study
Authors: Wang Junfeng 
Published: May 2020

Abstract
As a powerful tool of controlled preparation of polymeric nanomaterials, polymerization-induced self-assembly (PISA), has been developed and extensively studied in the past decade. In this work, the RAFT polymerization system of P4VP as chain transfer agent and St as monomer in methanol was modelled and their PISA process was simulated by dissipative particle dynamics. Different morphologies of P4VP-b-PS was obtained at tuning polymerization rate. The morphology evolution at high conversation was investigated in detail and it was found that the appearance of worm-like micelles was a key point to determine the self-assemblies was vesicles or tubes. In addition, the PISA behavior at low conversion was also studied. The final morphologies was different with that at 100% conversion, but these results were well agreed with experiments. This simulation studies identified polymerization rate as the key factors on tuning morphology in PISA and broadens its research method.
Effect of Heating Process on Flexural Strength and Toughness of CFRTP Molded by Multi-layer Press -Investigation on Effect of Residual Stress-
Authors: Itami Akihito , Obunai Kiyotaka , Okubo Kazuya , Takei Hiroyuki 
Published: May 2020

Abstract
This study investigated the effect of differences in heating process of each mold due to the molding with multi-layer press on changing in mechanical properties of CFRTP. CFRTP specimens molded with 10 pages multi-layer were prepared for 3 point bending tests and DCB tests, ENF tests in order to investigate the different of mechanical properties. The change in the mechanical properties of CFRTP molded by multi-layer press were investigated considering residual stress occurred by differences in heating process of each mold. Average of flexural strength, mode-I interlaminar fracture toughness and mode-II interlaminar fracture toughness of the specimen molded at 5th page were decreased compared with that of 1st page. Assuming the fiber as a rigid and considering the thermal shrinkage of resin, compressive residual stress should be occurred in the fiber since free shrinkage of the resin was constrained. It was considered that the reduction of flexural strength with the failure close to the compression surface was caused due to this additional compressive residual stress. The tensile residual stress also should be occurred in the resin due to constraint of free shrinkage of the resin. The observed reduction of toughness in the resin was also occurred for the procedure of crack propagation. The reduction rate of mode-I interlaminar fracture toughness was much remarkable than that of mode-II interlaminar fracture toughness. Tensile residual stress in the resin was dominant since the mode-I fracture is a crack opening mode.
Performance Measurement and Improvement of Lean Manufacturing Operations: A Leanness Assessment Literature Review for the Product Development Industry
Authors: Silvério Leandro , Trabasso Luís Gonzaga , Pessôa Marcus Vinicius Pereira 
Published: May 2020

Abstract
Today manufacturing sectors are more competitive than before. Thus, to execute an enterprise’s transformation in a company emerging as a lean organization it is crucial to have assessments and performance measurements that observe multiple variables during the lean implementation patch. The objective of this paper is to demonstrate a research method focused on lean performance measurement assessments from previous works, summarizing and organizing the existing evaluation standards in a way to allow different industrial segments to replicate the screening steps for a literature review construction. As a result, the existing lean performance measurements and methods from the last 23 years were refined in order to highlight opportunities and insights for future researches to be developed on the lean field.
Association of Obstructive Sleep Apnea With Nighttime Blood Pressure in African Americans: The Jackson Heart Study
Authors: Thomas Stephen Justin , Johnson Dayna A , Guo Na , Abdalla Marwah , Booth John N , Spruill Tanya M , Jackson Chandra L , Yano Yuichiro , Sims Mario , Calhoun David , Muntner Paul , Redline Susan 
Published: May 2020

AbstractBACKGROUNDObstructive sleep apnea (OSA), nocturnal hypertension, and nondipping systolic blood pressure (BP) are each highly prevalent among African Americans. However, few data are available on the association between OSA and nighttime BP in this population.METHODSWe examined the association of OSA with nighttime BP among African Americans who completed 24-hour ambulatory BP monitoring (ABPM) at Exam 1 (2000–2004) of the Jackson Heart Study (JHS) and subsequently participated in the JHS Sleep Study (2012–2016). Type 3 home sleep apnea testing was used to assess OSA measures, including respiratory event index (REI4%) and percent sleep time &lt;90% oxygen saturation (nocturnal hypoxemia). Nocturnal hypertension was defined as mean asleep systolic BP (SBP) ≥120 mm Hg or diastolic BP (DBP) ≥70 mm Hg. Multivariable linear regression models were fit to estimate the association between each OSA measure and nighttime SBP and DBP.RESULTSAmong 206 participants who completed ABPM and participated in the Jackson Heart Sleep Study, 50.5% had nocturnal hypertension and 26.2% had moderate to severe OSA (REI4% ≥15 events/hour). After multivariable adjustment, each SD (13.3 events/hour) increase in REI4% was associated with 1.75 mm Hg higher nighttime DBP (95% confidence interval (CI): 0.38, 3.11) and a prevalence ratio of 1.11 (95% CI: 1.00, 1.24) for nocturnal hypertension. Each SD (10.4%) increase in nocturnal hypoxemia was associated with a 1.91 mm Hg higher nighttime SBP (95% CI: 0.15, 3.66).CONCLUSIONSSeverity of OSA and nocturnal hypoxemia were associated with high nighttime BP in African American participants in the JHS.