bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effectiveness of contextual learning in the cooperative learning of think pair share based on mathematics concept understanding of the 7th grade junior high school
Authors: Prastiwi Diana , Sugiman  , Listyani Endang 
Published: November 2019

Abstract
This research aims to describe the effectiveness of contextual learning in the cooperative learning of think pair share and scientific learning in the discussion setting based on mathematics concept understanding of the 7th grade JHS. This study was quasi-experiment. The subject of this study was all of student 7th grade JHS of Negeri 2 Kretek and the samples were Class VII B and Class VII D. The data were collected through mathematics concept understanding tests. The statistic tests were used one sample t-test and independent t-test.The results of the research show that: (1) contextual learning in the cooperative learning of think pair share and scientific learning in the discussion setting are effective based on mathematics concept understanding of the 7th grade JHS; (2) contextual learning in the cooperative learning of think pair share is more effective than scientific learning in the discussion setting based on mathematics concept understanding of the 7th grade JHS.
Undergraduate students’ motivation and self-regulated learning in learning statistics: female vs male
Authors: Saija L M 
Published: November 2019

Abstract
This research aim is to find out the male and female undergraduate student’s motivation and self-regulated learning. The instrument used is the standardized instrument named MSLQ (Motivated Strategies for Learning Questionnaire) from Pintrich and DeGroot. The factors of motivation and self-regulated learning are: Self Efficacy, Intrinsic Factor, Test Anxiety, Cognitive Strategy Use, and Self Regulation. The respondents are 188 undergraduate students from statistics classes, in Universitas Advent Indonesia. The method used in this research is quantitative method with descriptive analysis and the difference between mean analysis. The result shows that averagely the female and male students in Universitas Advent Indonesia have high category in self-efficacy, Intrinsic Value, Cognitive Strategy Use, Self-regulation, and moderate category of Test Anxiety. Overall, the female and male motivation and self-regulated learning are high. Further, it is found that the difference between female and male undergraduate students’ test anxiety is statistically significant, but the other factors: self-efficacy, intrinsic value, cognitive strategy use, and self-regulation, the difference is not statistically significant. As a whole, the difference between female and male undergraduate students’ motivation and self-regulated learning is not statistically significant.
Experimental study on heat transfer characteristics of liquid nitrogen through coated transfer line
Authors: Bindu S S , Aromal  , Roy K E Reby 
Published: November 2019

Abstract
The effective and efficient utilisation of cryogen is made possible by optimised transfer lines which ensures reduction in chilldown time and cryogen usage. Cryogenic chill-down experiments were conducted on coated and regular copper tubes. Liquid nitrogen at different mass flux condition was used as the working fluid and Polyurethane coatings belonging to the family of Teflon was used as coating material. The performance of the regular and coated copper tubes at corresponding mass flux were compared. An increase in heat flux and heat transfer coefficient along with reduction in chilldown time was obtained by providing a low thermal conductive coating between the cryogen and wall material.
Effect of Orifice Geometry on Heat Transfer Characteristics of Jet Array
Authors: Leena R , Arunraj B , Prakash M. Jose 
Published: November 2019

Abstract
Jet impingement is one of the best methods for achieving high heat transfer coefficient in a single phase and has been a topic of active research for several decades, involving both experiments and computations. Most of the research on multiple jets have been carried out for an array of jets in the high Reynolds number regime. Experimental and numerical investigations were carried out to study the effect of inline three jet array impinging on a flat plate with varying Reynolds Number. Air was considered as the cooling medium. This study investigates the fluid flow and heat transfer characteristics of circular and square jet arrays impinging orthogonally on a flat-plate with inline arrangements. The number of jets is 3. The Reynolds number is varied from 3000 to 6000. The numerical methodology is validated using the experimental local Nusselt number distribution for inline three jet array with the same geometry and boundary conditions. In this work, circular and square of equal hydraulic diameters were selected for a comparative study. The results reveal that square jet array has better heat transfer characteristics compared to a circular array. The optimum value of jet to target plate distance is 6 times the jet diameter for both circular and square jet array. Also, the optimum value of pitch to diameter ratio is 2.
Simulation and Analysis of Solar Powered Induction Motor Drive with V/f Control for Electric Vehicle Applications
Authors: Mohammed Sheik , Muhammedali Shafeeque K , Muhammed Shanir P P , Shihabudheen K V 
Published: November 2019

Abstract
Induction Motor (IM) drive with V/f control for electric vehicle application is presented in this paper. The DC-AC converter of induction motor drive is supplied by a Solar PV system. The complete system model consists of solar PV array, DC/DC converter and three phase Inverter with V/f control is developed in MALTAB/Simulink. A 4 kW Induction motor is selected as drive. The simulation model developed in MATLAB is operated under different conditions, the results are obtained. The results are presented and discussed.
Risk Analysis in Implementation of Solar Energy Projects in Kerala
Authors: Mohamed Shahid P A , Firoz N , Sadhikh Mohammed , Dadu Mohith 
Published: November 2019

Abstract
India’s growth rate is slow in the deployment of solar power projects when compared to other developing and developed countries. The Ministry of New and Renewable Energy (MNRE) have often criticized Kerala for their inability to meet target for solar power projects installation. The aim of this study is to explore the state of solar projects in Kerala, with an objective to create a knowledge base of multifarious risks and control procedures. This study enables to identify the main risk in implementing solar energy projects and develop a guideline which could serve to reduce the risks associated with investments in solar projects. In this study, survey was conducted amongst the different players of solar power project installation and operation to identify the various risk factors and sub factors. These factors were categorised and further quantified using the decision making tool, Analytic Hierarchy Process (AHP). Political risk, technical risk, financial risk and environmental risk are the prominent risk factors involved in solar projects installation. The impact of the sub factors are identified using AHP. Payback period and non-approval of on grid small scale projects from KSEB are the critical factors. The inattention in reduction of risks at organizational level, and project level, can substantially affect the solar projects at a catastrophic level. Overall, the need for future research is established in this study for investigating the capability of Project Management Offices in risk assessment and management.
Establishing a relationship between machining parameters and output responses for cutting stainless steel ICSS 1218 by Wire EDM
Authors: Rajeev N , Jishnu J 
Published: November 2019

Abstract
Stainless steel ICSS 1218 have large potential in the aerospace sector due to their inherent characteristic and advantageous properties like strength, ductility, weldability and corrosion resistance. The Wire Electric Discharge Machining (Wire EDM) is a thermal machining process capable of accurately machining parts with high hardness or complex shapes. One of the statistical softwares Minitab 17 was used for conducting the analysis and develop a mathematical model of the relation connecting the input parameters pulse on time, flushing discharge, and wire feed rate and output responses surface roughness and material removal rate. This model is found reasonably accurate. Experimentation was conducted in a series of tests called runs, in which changes are made in the input variables in order to identify the reasons for changes in the output response.
Effect of graphene, SiC and graphite addition on hardness, microstructure and electrical conductivity of microwave sintered copper MMCs fabricated by powder metallurgy route
Authors: Ayyappadas C , Shanu O S , Vijayan Abhilash , Mohammed Irfan A , Vishnu V , Shamnadh M 
Published: November 2019

Abstract
Copper MMCs reinforced with graphene, SiC and graphite flakes with varying mass fractions of 2.5, 5, and 7.5 wt% SiC, 2.5, 5, 7.5, and 10 wt% graphite and 0.2, 0.4, 0.6 and 0.8wt% graphene particles were fabricated through powder metallurgy route. The powder mixtures were blended and then compacted under a uniaxial pressure of 400MPa for both Cu-SiC and Cu-Gr composites and 600Mpa for Cu-Gn composites. Green compacts were sintered by microwave (MW) sintering process. MW sintering was performed at 950°C in open atmosphere with a heating rate of 25°C/min for all composites. Densification parameter (DP) was determined for all MMCs and a reduction in DP values were observed with an increase in weight percentage of reinforcement particles as a result of increase in porosity. Higher mass fractions of reinforcement particles in the Cu matrix tend to offer a diffusion barrier to copper atoms. Micro-structural analysis was performed using Optical and scanning electron microscope which revealed a homogeneous microstructure of all composites at low mass fractions of Sic, graphite and graphene. In order to detect the presence of any oxides of Cu and other elements, EDS analysis was carried out. Hardness data showed an increasing trend for Cu-SiC and Cu-Gn composites and a declining trend for Cu-Gr composites. Porosity has a significant effect on the electrical conductivity values of the composites.
Synthesis and Characterization of Ultrasonically Treated Al/Al2O3 Nanocomposites
Authors: Fahd Syed Muhammed , Krishnakumar T. S. , Aju kumar V. N. , Markose Agesh 
Published: November 2019

Abstract
Aluminium-Alumina (Al/Al2O3) nanocomposites are synthesized for different amounts of reinforcement through liquid route. Ultrasonic treatment (UST) is carried out during the solidification of the melt. It is expected that the addition of nanoparticles to the melt and UST provides grain refinement for the specimens due to increased number of nucleation sites and cavitation effects respectively. The effects of UST on these nanocomposites are studied using the results obtained from optical microscopy, hardness and XRD. Reduction of porosity and grain refinement is observed in the synthesized nanocomposites.
Enhancing the thermophysical properties of PAG lubricant using graphene nano-sheets.
Authors: Sanukrishna S S , Raju Ajin V , Krishnan Anantha , Harikrishnan G H , Amal A , Kumar T S Krishna , Prakash M Jose 
Published: November 2019

Abstract
One of the most attractive methods to improve the thermo physical and heat transfer properties of conventional coolants and lubricants is the use of nanoparticles in it. Nanofluids are stable colloidal suspensions of nanoparticles and base fluids. The nanofluids exhibit superior thermal performance compared to conventional heat transfer fluids and this leads to the best hope for lubricants based nanofluids as well. Nanolubricant is a new class of lubricant produced by dispersing nano-sized particles of metals, metal oxides, carbon and its allotropes into conventional lubricating oils. In the present study, experiments were conducted to measure the thermophysical and rheological properties of polyalkyleneglycol (PAG) refrigerant compressor oil suspended with graphene nano-sheets. The effect of particle concentration and temperature on thermal conductivity and viscosity of nanolubricant were elucidated. The volume fraction is varied from 0.05 to 0.8% and the temperature range is from 15°C to 85°C. The rheological properties have been investigated at various shear rates, particle concentrations, and temperatures. Furthermore, a correlation is proposed to predict the thermal conductivity of Graphene-PAG nanolubricant. The results revealed that the thermal conductivity and viscosity of the nanolubricant is strongly depends on the volume fraction and temperature. The nanolubricant exhibits higher thermal conductivity and viscosity compared to the PAG oil. Unlike in the case of pure lubricant, the shear rate has a crucial impact on the behavior of nanolubricant. Interestingly, the pure lubricant, which is a Newtonian fluid, is transformed into non-Newtonian when nanoparticles are appended with it. From the studies, it was observed that the nanolubricant having graphene particle concentration of 0.05% is optimum for refrigeration application.
The complex concept of quantity in the past and (possibly) the future of the International Vocabulary of Metrology
Authors: Mari L , Chunovkina A , Ehrlich C 
Published: November 2019

Abstract
The International Vocabulary of Metrology (VIM) is a foundational document of measurement science, with the ambition of providing a system of “basic and general concepts and associated terms” of metrology. Such a system has evolved with the evolution of measurement science, and this is particularly manifest in the case of the cluster of concepts around ‘quantity’. The present paper presents some aspects of this development, by first remarking on the importance of terminology for measurement science and then introducing the basic problem what is a quantity? as a way to provide a well-grounded explanation to the usual claims that two quantities can be equal, or two values of quantities can be equal, or a quantity of an object can be equal to a value of a quantity. The analysis develops along three questions: (1) what is the relation between general properties and individual properties? (2) what is the relation between properties and quantities? (3) what is the relation between quantities of objects and values of quantities?
Exemplifying natural science measurement in the social sciences with Rasch measurement theory
Authors: Andrich David 
Published: November 2019

Abstract
This paper presents a social science example of measurement in which the integer count from a convenient origin is shown to be in equal units. This feature is identical to direct measurement in the natural sciences. The example rests on applying the probabilistic Rasch measurement model to two assessments of the same persons which (i) realises measurement as a real valued comparison between persons invariant with respect to instruments; (ii) characterises random variation of replicated measurements by the Gaussian distribution; (iii) shows that the variance of the replications is the inverse of the size of the unit.
Density measurements of viscoelastic samples with oscillation-type density meters
Authors: Furtado A , Gavina J , Napoleão A , Pereira J , Cidade M T , Sousa J 
Published: November 2019

Abstract
The oscillation frequencies produced by oscillation-type density meters during the density measurements suffer damping due to the viscosity of newtonian liquids. The effect of viscoelastic behaviour of non-newtonian liquids in the damping of these oscillations is still not known. So, 5 viscoelastic liquids were rheologically characterized, resorting to a rotational rheometer, and their density measured in order to provide a deeper insight into the damping effects produced by these types of fluids. To do so, oscillatory data was related with the obtained density deviations. The results of this study are one of the first insights for the knowledge of the measuring behaviour of these density meters when measuring viscoelastic fluids, one of the scopes of the EMPIR Project 17RPT02-rhoLiq.
Towards patient-centred cognition metrics
Authors: Melin J , Pendrill L R , Cano S J 
Published: November 2019

Abstract
Metrological quality assurance is essential if reliable decisions about diagnosis, treatment and rehabilitation are to be made consistently throughout the healthcare system. However, many observations in healthcare are considered to lie ‘off the scale’ of quantitative measurement. We have previously argued that a fundamental reappraisal of metrology is needed if such ordinal or nominal properties are to be included in an extended quantity calculus on which the SI could be based. As just one example, metrological quality assurance in person-centred care now seems possible in a novel way for partners in care; physician ability (e.g., to diagnose cognitive impairment correctly) and patient ability (e.g., cognitive performance of patients with Alzheimer’s disease) using novel formulations of causal Rasch models articulated through construct specification equations (CSEs). Here, as part of our research in the EMPIR NeuroMET 15HLT04 project, we illustrate how construct specification equations and new metrological references for task difficulty for block tests, such as the Knox Cube Test, can be established in terms of entropy, reversals and average distance.
Abbe error compensation for a micro/nano CMM with a coplanar stage
Authors: He Y X , Li R J , Fan K C , Huang Q X , Hu P H , Wang Y H , Liu W W , Hu Y 
Published: November 2019

Abstract
A micro/nano Coordinate Measuring Machine (CMM) with a stroke of 20 mm × 20 mm × 10 mm has been developed by our group. The “Pagoda structure” with Chinese style is adopted, which has fine mechanical stability. The base of the micro/nano CMM is made of granite to achieve high thermal stability. The stages are driven by piezoelectric motors with a resolution of 1 nm in three directions. The displacements of the stages in horizontal directions are detected by homemade Michelson interferometers. The optical axes of the two interferometers are consistent with their slide way of the coplanar stages respectively, which can reduce the Abbe errors in X and Y axes as much as possible. Semiconductor laser diodes are used as the light source of the interferometers due to low-cost and small size. A linear diffraction grating interferometer (LDGI) has also been developed to detect the displacement in Z direction. After subdivision, the measuring resolution can reach nanometer scale. The micro/nano CMM is compatible with different types of probes. A model of Abbe error and its compensation method are proposed in this paper. Experimental results show that the positioning errors were reduced from 435 nm to 91 nm and from 426 nm to 151 nm via Abbe error compensation method. The flatness of a 0-grade gauge block was tested by the micro/nano CMM, the repeatability of 44 nm (K=2) was achieved.
The BEAR Assessment System Software as a platform for developing and applying UN SDG metrics
Authors: Fisher W , Wilson M 
Published: November 2019

Abstract
There are avoidable obstacles delaying realization of the United Nations’ Sustainability Development Goals (https://unstats.un.org/sdgs/) which have been introduced by the methods used in measuring sustainability impacts and in monitoring progress toward the UN goals. Scientific measurement offers practical advantages based in rigorously defined and meaningful quantitative units that facilitate close management, trust, and efficient communication. Were improved metrics to be incorporated in systems of metrological traceability, legally binding conformity assessments could eventually provide a basis for new sustainability accounting standards, economic models, and the means for tracking returns on investments in sustainability impacts. Toward these ends, there is a need for making access to improved measurement principles, methods, and results much more widely available. That purpose could be served by the BEAR Assessment System Software (BASS), which provides an online environment offering practical tools for instrument development, administration, calibration, and quality improvement; data analysis and measurement; and reporting. Each variety of sustainability stakeholder could make use of the system for their diverse purposes, advancing their unique self-interests further by cooperatively competing with other stakeholder groups than they could working alone.
New tendencies in teaching measurement science in the higher education
Authors: Maiurova A , Konopelko L , Kustikov Y , Kustikova M , Bykovskaia E , Tyurikova E 
Published: November 2019

Abstract
This article dwells upon the organization of the educational process at ITMO University for specialization 27.04.01 Standardization and Metrology for masters according to the individual educational standard 3++ of ITMO University. The main professional standards and areas of activity for the implementation of this specialization and the process of creating competencies based on professional standards and areas of activity are described.
Analysis of the effect of lens components on the optical properties of polarization radiation in experimental studies of biomarkers
Authors: Tyurikova E , Kustikova M , Stupnikov A , Maiurova A 
Published: November 2019

Abstract
This article dwells upon the investigation of the radiation polarization structure in analysing biological tissues. The systematic investigation of the polarization parameters of lens systems with non-planar media boundaries was performed to increase the accuracy parameters of polarization instruments used to analyse biological tissues. A review of existing solutions, developed mathematical model and experimental setup were given, and series of experiments are described.
Actual measuring technologies of Industry 4.0 and analysis of their realization experience
Authors: Taymanov R , Pronin A , Sapozhnikova K , Baksheyeva Iu , Danilova I 
Published: November 2019

Abstract
Civilization development requires a multifold increase in the volume of measuring information. Such an increase, to a significant extent, is caused by the necessity to solve qualitatively new measuring tasks. To meet this need is possible by the transition to new measuring technologies. The experience of the D.I. Mendeleyev Institute for Metrology in developing actual technologies, in particular, metrological self-check and virtual tests, proves their efficiency and discloses realization features.