Miracle-dz/UniFAR-FTUs huggingface dataset:
A computational study of the effects of viscosity on lobed mixer flowfields

A computational study of the effect of viscosity on lobed mixer flowfields has been carried out using a three-dimensional, compressible, unstructured mesh Navier-Stokes solver. Computations were carried out on a class of lobed mixer which is representative of the mixer configurations in use on turbofan engines with penetration angle in the range 220 to 450 and velocity ratio in the range 0.53 to 1.0. It was found that as the lobe penetration angle is increased the boundary layer in the lobe grows leading to filling of the lobe with low momentum fluid. The effect of this blockage is to reduce the effective lobe angle "seen" by the freestream and thus to reduce the trailing streamwise vorticity. For the lobe configuration studied flow separation was first observed at a penetration angle of 350. There was very little benefit in terms of shed streamwise circulation of increasing the lobe penetration angle above 350 because the circulation is limited by the increased boundary layer blockage. The characteristics of the boundary layer at the inlet to the lobe were shown to have a significant impact on the shed streamwise vorticity and thus on mixer performance. A large inlet boundary layer displacement thickness resulted in filling of the lobe with low momentum fluid and hence a reduction in the lobe effective angle. The evolution of streamwise circulation downstream of the trailing edge was shown to be characterized by two distinct regions. The first region was characterized by approximately constant circulation and was followed by a region of decaying circulation. A viscous vortex model was developed which captured the evolution of streamwise circulation. The model showed that the decay rate of circulation and thus the region in which streamwise vorticity is important in the mixing is dependent on the turbulent diffusivity, which is in turn primarily dependent on the stream velocity ratio. For the lobe configurations studied the region of approximately constant circulation extended for about 6 lobe wavelengths and the region in which streamwise vorticity is important in the mixing was roughly 18 wavelengths downstream of the lobe trailing edge. Mixing losses downstream of the trailing edge were shown to be the dominant loss source, typically accounting for about 95% of the total loss for a velocity ratio of 0.6. As the lobe penetration angle was increased the total loss increased, leading to a reduction in thrust. There was approximately a 16% reduction in thrust coefficient for an increase in penetration angle from 220 to 450. Thesis Supervisor: Edward M. Greitzer H. N. Slater Professor of Aeronautics and Astronautics Director, Gas Turbine Laboratory Thesis Supervisor: Ian A. Waitz Professor of Aeronautics and Astronautics
Modeling teamwork behaviors on a combat field in JADE

The paper addresses some problems related to modeling collective behaviors using an example of interactions on a combat field. A multi-agent model of such a combat that is based on behaviorand communication rules was proposed. Next, the model was implemented in the JADE environment (Java Agent DEvelopment Framework) – the one dedicated to agent-oriented programming. A series of simulations of the combat model were carried out to observe complex behaviors within a group of soldier-agents. The analysis was also made from the perspective if the JADE environment is efficient for such simulations.
Alpha wave reactivity following eye closure: a potential method of remote hands free control for the disabled

Objective. Recent research by the authors has investigated alpha wave amplitude increases in response to reduced visual input as a system for controlling electrical devices, with application for the disabled. However, alpha wave changes contingent with visual input is poorly understood. Further research was conducted on this phenomenon in order to optimize our ability to harness it as a control device. Study Design. To address this lack, alpha wave reactivity was studied in 21 non-disabled and 16 neurologically disabled (spinal cord injured; SCI) persons in laboratory conditions. Results. Large increases in alpha wave reactivity occurred in the 8– 12 Hz range in posterior, central and anterior regions of the brain for both groups. There were no significant differences between the two groups in terms of alpha wave increases in amplitude following eye closure (EC) in the posterior cortex. Not all subjects showed similar increases in all cortical areas. No significant differences in alpha wave amplitude increases following EC were found for sex, age, handedness or hemisphere. However, in the non disabled group, substantial negative associations occurred of body mass index with all cortical sites, while mild but consistent positive associations were found for diastolic blood pressure. Conclusion. SCI persons have sufficient amounts of alpha wave reactivity contingent with eye closure to operate a hands free control device. The information from this research will be used to optimize technology being designed to activate, quickly and remotely, electrical devices using brain signals.
Iprovements OLED operation due to using additional layers

In this work we proposed OLED structure with NiPc as hole transport layer. Current-voltage and luminance characteristic of ITO/NiPc/Alg3/PEGTE/Al and ITO/Alg3/PEGTE/Al structures were also investigated. It was shown that using NiPc as hole transport layer reduced operating voltage and improved OLED performance.
Resigned robots and aspiring artisans: a conceptualisation of the IT service support worker

In the last two decades the IT service support worker has emerged to be a worker-type of considerable socio-economic importance. Such workers are symbolic of the trends towards the importance of information/knowledge and information technology within modern economic/political systems. Such systems, heavily influenced by governmental bodies and business organisations, have aggrandised the use of rationalising customer-centric management techniques. And yet such symbolic workers are largely hidden and unacknowledged as a specific type of worker in the business literature. This thesis represents an attempt to conceptualise the IT service support worker as a worker-type, inducing a conceptual model that identifies three aspects to the worker: information systems worker; knowledge worker and service worker and considers them from each of these perspectives. This qualitative research draws on a rich mix of observational and interview data collected across five UK organisations to produce a narrative that suggests that, for different IT service support workers, those different aspects tend to be variably emphasised within their team roles. The study additionally offers a theoretical conclusion that IT service support workers might reasonably be divided into different classes depending upon not only the design of their team role but also their individual career orientations and the nature of the knowledge they actually use in their work. Four such classes are identified as being of particular significance and these are evocatively named: Resigned Robots ; Constrained Careerists ; Establishment Experts and Aspiring Artisans . Whilst being outside of the scope of this study, it is suggested that this novel typology might also be useful for classifying other worker groupings. The study is intended to be useful for the enhancement of IT service management practice and makes several contributions in this regard. These include the need for managers to recognise the importance of experientially-acquired knowledge for efficiency in IT service support work and a suggestion that managers might tailor HRM practices for different classes of worker.
An exploration of self-efficacy as a motivation for rock climbing and its impact on frequency of climbs

This study utilizes the theoretical framework of self-efficacy to explore the role it plays in rock climbing. Data were gathered from on-site self-administered surveys to rock-climbers in three different locations (N=72). A conceptual model was developed to consider the relationship between selfefficacy and frequency of rock climbing. The initial factor of self-efficacy did not hold, thus allowing us to reconceptualize the nature of the self-efficacy variables in relation to frequency of rock climbing. A discussion of how the results from this study support viewing self-efficacy as a stepwise process and how viewing self-efficacy in this manner can be useful to practitioners for programmatic purposes follows.
Elevated 4R-tau in Astrocytes From Asymptomatic Carriers of the MAPT 10+16 Mutation

The MAPT 10+16 intronic mutation causes frontotemporal lobar degeneration (FTLD) by increasing expression of four-repeat (4R)-tau isoforms. We investigated the potential role for astrocytes in the pathogenesis of FTLD by studying the expression of 4R-tau. We derived astrocytes and neurons from induced pluripotent stem cells from two asymptomatic 10+16 carriers and, compared to controls, showed persistently increased 4R:3R-tau transcript and protein ratios in both cell types. However, beyond 300 days culture, 10+16 neurons showed less marked increase of this 4R:3R-tau transcript ratio compared to astrocytes. Interestingly, throughout maturation, both 10+16 carriers consistently displayed different 4R:3R-tau ratios at transcript and protein levels. Our study shows elevated levels of 4R-tau in astrocytes implicating glial cells in the pathogenic process and also suggests a cell-type-specific regulation and may inform and help on treatment of preclinical tauopathies.
Practical consequences of the extrinsic contributions to the properties of piezoelectric sensors and actuators

Extrinsic contributions to the piezoelectric properties of ferroelectric ceramic sensors and actuators are described. A new formalism which describes contributions of vibrating domain walls to the piezoelectric properties is presented. The formalism is based on the classical Rayleigh law and allows calculations of the piezoelectric coefficients as a function of amplitude and frequency of the driving field. The domain wall contributions to the piezoelectric properties of lead zirconate titanate (PZT), barium titanate (BaTiO/sub 3/) and high temperature bismuth titanate (Bi/sub 4/Ti/sub 3/O/sub 12/) based ceramics are discussed. The effects of microstructural parameters on the piezoelectric properties of ceramics are discussed in terms of domain wall vibrations. It is demonstrated how piezoelectric properties of ceramics may be tailored by manipulating domain wall contributions.
A Distributed Polarizing Transmission System for Frequency Selective Fading Channels

: Motivated by Arikan’s channel polarization that shows the occurrence of capacity-achieving code sequences, we address the scheme design issues by switching to polarizing frequency selective fading channels while transmitting information symbols in a source-relay-destination MIMO-OFDM relay communication system. A simple polar-and-forward (PF) MIMO relay scheme, with source node polar coding and relay nodes polar coding, is proposed to provide an alternative solution for transmitting with higher reliability than the conventional decode-and-forward/amplify-and-forward (DF/AF) relay schemes. In the proposed scheme, OFDM modulator is implemented at source node, some simple operations, namely time reversion, complex conjugation and polarization, are implemented at relay nodes, and the cyclic prefix (CP) removal is performed at destination node. It is divided into two symmetrical polarizing relay systems, i.e., the down-polarizing system and the up-polarizing system, which result in different capacities for the polar system. We analyze the bit error rate (BER) performance with the fixed polar system equipped with four OFDM blocks, which is an idea approach to select signal sequences that tend to polarize in terms of the reliability under certain combining and splitting the transmitted OFDMs in the frequency selective fading (FSF) channels. The polar system has a salient recursiveness feature, and thus the transmitted information signals embedded in the polar code can be decoded with a low-complexity decoder.
Body powered thermoelectric systems

Great interest exists for and progress has be made in the e↵ective utilization of the human body as a possible power supply in hopes of powering such applications as sensors and continuously monitoring medical devices [1]. This report furthers into the area of thermal energy harvesting, which focuses on using the temperature di↵erential generated between the human body and the ambient environment to generate power. More specifically, a body-powered, thermoelectric-based power supply and system will be introduced and examined, with hopes that this technology will be utilized alongside low-power, medical monitoring applications in order to achieve self-su ciency. This report also analyzes the performance of existing thermoelectric-based body-powered energy harvesting applications and compares that with the new design introduced in this work. The new designs were able to output upwards of 25μW/cm2 or, equivalently, 280μW for the entire heat sink system. Additionally, this report details the physics associated with thermoelectric modules, addresses the issues with modern thermoelectric heat-sinks, introduces two new types of wearable, conformal heat sinks, quantifies the performance of the body-powered thermoelectric supply, tests a flexible EKG processing board, and analyzes future paths for this project. Thesis Supervisor: Dr. Anantha P. Chandrakasan Title: Department Head, Electrical Engineering and Computer Science Thesis Supervisor: Dr. Timothy Hancock Title: Assistant Group Leader, MIT Lincoln Laboratory
Design and Analysis of HJ-1-C Satellite SAR Antenna

环境一号C 星SAR 天线采用了构架式可展开网状抛物面反射器，天线构型复杂，在轨展开步骤多，天线展开可靠性及在轨电气性能等都是设计难点。 该文阐述了天线总体、结构和电气方面的设计研究，并从力学和热角度进行了实际工况的分析。 环境一号C 星在轨成功展开及良好的SAR 成像质量表明了天线在机电热及可靠性设计方面满足型号工程的使用要求，为集中式网状抛物面SAR 天线的设计研究提供了宝贵经验。
Disciplinary Discourse in Design Reviews: Industrial Design and Mechanical Engineering Courses

An increase in focus on design thinking in the engineering community and design education has led to innovative outcomes. A part of the design thinking education comes from the goals and teaching methods of instructors. From a given dataset of design reviews two different courses were evaluated: industrial design and mechanical engineering. This work analyzes how instructor interactions with individuals or teams fulfill course outcomes. From a discussion of the data analysis it is suggested that industrial designers focus on the passion of the product design while mechanical engineers focus on the functionality and completeness of the design. The ideological approach in each disciplinary course merge ideology of courses such as industrial design into course such as mechanical engineering. The design thinking push hopes to build future innovators, preparing students for the openendedness of real world problems.
Abnormal

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BICYCLE INTERACTION HAZARD SCORE: A THEORETICAL MODEL

A calibrated and transferrable model is needed to estimate bicyclists' perception of the hazards of sharing roadway segments with motor vehicles. Such an interaction hazard (perception) model would help overcome one of the barriers to the development of a sequential bicycle travel demand simulation or forecasting model. An interaction hazard model would also greatly aid planners in the priority ranking of competing roadway segments for on-road bicycle facilities by providing an objective and stable supply-side measure of bicycle facility need. In addition, a model would assist planners to objectively assess the overall bicycle "friendliness" of their road networks as well as provide a uniform tool to assist in the development of bicycle suitability maps. The theoretical interaction hazard score (IHS) model described in this paper represents an opportunity, after statistical calibration (and the possible incorporation of roadway grade and curvature terms for application in hilly terrain), to fulfill the aforementioned needs. On the basis of consensus group evaluation, the IHS model incorporates the appropriate exposure variables that describe actual and perceived interaction hazards to bicyclists sharing parallel facilities with motor vehicles.
I

The empirical literature on the wage effect of 'right-to-work' (RTW) legislation remains fairly ambiguous with studies producing contrasting results. In this article, we address this issue by exploring the impact of RTW on wage heterogeneity between socio-demographic and occupational subpopulations in the U.S. Using data from the 2012-2014 Current Population Survey, we employ two analytical techniques for estimating the wage effect of RTW legislation. First, we utilize multi-level regression to observe the effects of state-level RTW legislation on individual hourly earnings and wage differences while controlling for socio-demographic and occupational characteristics of individual workers as well as developmental and regulatory characteristics of states. Second, we utilize propensity-score matching (PSM) to observe the wage difference between similar workers located in RTW and non-RTW states. According to estimates from the fully specified multi-level regression models, private workers in RTW states earn 1 percent less than workers in non-RTW states. However, according to estimates from the PSM approach, private workers in RTW states earn about 6 percent less than similar workers in non-RTW states. The results show RTW legislation reduces hourly wages, but the magnitude of the wage effect is dependent on the specification of regression models and the statistical approached use to estimate the treatment effect of RTW legislation. Additionally, we also find RTW both suppresses and exacerbates existing wage inequalities between socio-demographic subpopulations.
UTAUT APPROACH APPLICATION TO ANALYZE THE DETERMINANTS OF FINTECH MARKET AGGREGATOR USER SATISFACTION

Fintech Market Aggregator (FMA) gather information, and compare financial product offers from various banks or non-bank institution which help the customer to decide which product that fit their needs that support financial literation in Indonesia. This research aims to analyze the determinant factors of FMA user satisfaction using the UTAUT approach that still limited to be found and enriched by the trust variable. The study used an online questionnaire from 90 FMA users, analyzed by SEM method and SMART PLS application. The result showed that performance expectancy, effort expectancy, and social influence had a positive impact on the use of FMA services. The use of FMA had a positive effect on user satisfaction. The usage of the UTAUT model on this research could explain that all the variables had a 71.6 percent influence on to use of FMA. And the use of FMA services influenced user satisfaction of 45.4 percent.
An examination of the effect of decision style on the use of a computerized project management tool

Managing a software development project presents many difficulties. Most software development projects are considered less than successful, and many are simply canceled. Ineffective project management has been cited as a major factor contributing to these failures. Project management tools can greatly assist managers in tracking and controlling their projects. However, project management tools are very structured and analytical in nature, which is not necessarily supported by decision-making styles of the managers. This research examined the influence that decision style has on a project manager's use of a project management tool.
The Effect of Capital Structure on Performance of Banks in Ghana: Evidence from Listed Banks on Ghana Stock Exchange

Capital structure decisions are still debatable issue in corporate finance literature. The issue has been whether capital composition of debt and equity is relevant; and if relevant, whether optimal capital structure exists. Whilst some scholars have empirically supported positive association between capital structure and firms’ performance, others have concluded an inverse relationship. Therefore, it is of great importance for managers to abreast themselves with modern theories and empirical findings available in order to serve as a guide when taking financial decisions on whether to source funds internally or externally to finance investment projects. The main object of the study is to investigate whether relationship exists between capital structure (measured in terms of short-term debt to total asset and total debt to total asset) and listed banks’ performance (measured in terms of earning per share) based on data gathered from 2010 to 2019. Balanced panel data was analyzed through the use of descriptive statistics, correlation analysis and Ordinary Least Square (OLS) regression analysis. The findings revealed a highly leveraged Ghanaian banks; with short term debt and total debt forming 71.57% and 85.19% of total assets respectively. It was also revealed further that capital structure has statistically significant association with banks’ performance. However; short term debts showed a positive relationship or correlation with performance whist total debt and performance exhibited an inverse correlation with performance. The findings would serve as a guide to bank managers when making financial decision on capital structure.
Investigation of Refrigerant R134a Two Phase Flow Heat Transfer in Vertical Heat Exchanger Channel

Two phase flow boiling heat transfer and pressure drop in the vertical evaporator tube section of refrigeration system have been experimentally investigated using refrigerant R134a as a working fluid. The objective of the present work is to investigate experimentally the effect of heat flux, mass flux, vapor quality and saturation temperature on refrigerant flow boiling heat transfer characteristics in the evaporator of refrigeration system. These investigated parameters have significant impacts to enhance the thermal performance of the evaporator. The experimental investigations were conducted in smooth copper tube with inner diameter 5.8 mm and 600 mm length under different test conditions. The test conditions considered in this study were, for heat flux of 7.718-32.78 kW/m 2 , mass flux of 97.3-148.7 kg/m 2 . s , saturation temperature of 20.58 to -15.68 ̊C and vapor quality of 0.3-1. It can be concluded from the results that, the average heat transfer coefficient at relatively greater mass flux 148.7 kg/m 2 . s was higher in range of 21% compared to other mass fluxes at constant test conditions. The relatively higher value of heat transfer coefficient was observed at heat flux 32.78 kW/m 2 with average increase of 19% compared to the relatively lower value 23.38 kW/m 2 . The enhancement in local heat transfer coefficient at saturation temperature University of Thi-Qar Journal Vol.14 No.3 SEP 2019 Web Site: https://jutq.utq.edu.iq/index.php/main Email: utj@utq.edu.iq 2 15.68 ̊C was higher by about 12% than that for the relatively lower temperature -20.58 ̊C. The effect of increase in mass flux and heat flux on pressure drop in the evaporator tube was about 9% and 7.5% respectively.