Miracle-dz/UniFAR-FTUs huggingface dataset:
A Study on the Ball Screw Friction Torque

Tato studie se zaměřuje na zlepšení současných modelů tření v kuličkovém šroubu za účelem jejich efektivnějšího využití v Ecodesignu obráběcích strojů a jejich enegretické optimalizace. Modely použité v této studii vycházely z modelů tření v kuličkových ložiskách (Harris) a ve valivých lineárních vedeních (Tan). Data pro porovnání výsledků modelů byla převzata z disertace “Precision Control of High Speed Ball Screw Drives” Amina Kamalzadeha, která byla zaměřena na řízení lineárních os s kuličkovým šroubem. Celkem byly studovány tři modely. Prvním z nich byl dřívější model tření v kuličkovém šroubu ad autora Olaru. Byl zjištěn výrazný rozdíl mezi výsledky experimentu a tímto modelem. Nebyl nalezen způsob, jak výsledky tohoto modelu zlepšit. Druhým model byl založen na tření viskoelestických materiálů, který byl úspěšně použit pro modelování tření v lineárních valivých vedeních s mikro kuličkami. Bylo zjištěno, že tento model není použitelný pro modelování tření v kuličkových šroubech obvyklých velikostí. Třetí model byl založen na modelech tření v kuličkových ložiskách. Původní model určený pro valivá ložiska byl zjednodušen několika předpoklady, pro zrychlení výpočtu. Výsledky tohoto modelu přijatelným způsobem aproximovaly výsledky experimentu a ukázalo se tak, že použitá zjednodušení mohou být aplikována. Klíčová slova Kuličkový šroub, EHL, tření
IMPROVING NETWORK OPERATIONS WITH FREEWAY RAMP CONTROL

The Expressway Surveillance Project had has its immediate objective to develop, operate and evaluate a pilot network information and control system to reduce travel time and increase traffic flow. This paper describes the planning, conduct and evaluation of a series of experiments with freeway ramp control which were undertaken for the purpose of improving network operations following the development of a pilot detection system. The paper is presented in two parts: initial experimentation with manual control and initial experimentation with automatic control.
Athletic Development

Athletic Development offers a rare opportunity to learn and apply a career full of knowledge from the best. World-renowned strength and conditioning coach Vern Gambetta condenses the wisdom he's gained through more than 40 years of experience of working with athletes across sports, age groups, and levels of competition, including members of the Chicago White Sox, New York Mets, and U.S. men's 1998 World Cup soccer team. The result is an information-packed, myth-busting explanation of the most effective methods and prescriptions in each facet of an athlete's physical preparation. Gambetta includes never-before-published and ready-to-use training approaches insport-specific demands analysis,work capacity enhancements,movement skills development,long- and short-term training program progressions, andrest and regeneration techniques. Athletic Development explains what works, what doesn't, and why. Gambetta's no-nonsense approach emphasizes results that pay off in the competitive season and reflect his work at the highest echelons of sport. Merging principles of anatomy, biomechanics, and exercise physiology with sports conditioning applications and four decades of professional practice, this is the definitive guide to performance-enhancing training.
SUSPENSION AND GUIDANCE CONTROL SYSTEM FOR A DC ATTRACTION MAGLEV VEHICLE

The theory, operation and implementation of the control system developed and built into a 2.7 tonne test vehicle are described. The vehicle has 8 magnets, mounted in pairs offset either side of the support rail at each corner of the vehicle. The magnet pairs are driven together to give vertical control and differentially to introduce damping into the lateral (guidance) mode. The design develops a control technique whereby the suspension response may be freely chosen without the control system stability requirement either dominating or confusing the choice.
Feasibility Study of a Network Meta-Analysis and Unanchored Population-Adjusted Indirect Treatment Comparison of Niraparib, Olaparib, and Bevacizumab as Maintenance Therapies in Patients with Newly Diagnosed Advanced Ovarian Cancer

Simple Summary Ovarian cancer (OC) is a leading cause of cancer-related death and 85% of women with advanced OC relapse after chemotherapy. First-line (1L) maintenance therapy is given to prolong the benefit of chemotherapy. However, selection of a 1L maintenance therapy is challenging given the number of therapies available and the lack of clinical trials that directly compare these therapies. Indirect treatment comparisons (ITCs) allow the comparison of therapies across trials and may inform selection of the most appropriate treatment option. ITCs must follow statistical principles to ensure similarity among trials and allow for a fair comparison. This study assessed whether two types of ITC could be performed to compare the poly(ADP-ribose) polymerase inhibitor niraparib with other 1L maintenance therapies. The 12 clinical trials assessed differed too significantly to meet recommended criteria for comparison. This study highlights the need for caution when comparing trial data to inform treatment decisions. Abstract Selecting a first-line (1L) maintenance option for ovarian cancer is challenging given the variety of therapies, differing trials, and the lack of head-to-head data for angiogenesis and poly(ADP-ribose) polymerase (PARP) inhibitors. Thus, indirect treatment comparisons (ITCs) can aid treatment decision making. This study assessed the feasibility of two ITCs, a network meta-analysis (NMA) and a population-adjusted ITC (PAIC), comparing the efficacy of the PARP inhibitor niraparib in the PRIMA trial (NCT02655016) with other 1L maintenance treatments. A systematic literature review was conducted to identify trials using the Cochrane Handbook for Systematic Reviews of Interventions to assess differences in trial design, population characteristics, treatment arms, and outcome measures. All 12 trials identified were excluded from the NMA due to the absence of a common comparator and differences in survival measures and/or inclusion criteria. The PAIC comparing PRIMA and PAOLA-1 trials was also not feasible due to differences in inclusion criteria, survival measures, and the previous receipt of chemotherapy/bevacizumab. Neither ITC met recommended guidelines for analysis; the results of such comparisons would not be considered appropriate evidence when selecting 1L maintenance options in ovarian cancer. ITCs in this setting should be performed cautiously, as many factors can preclude objective trial comparisons.
A Study on Smoke Control Characteristic by the Effect off Jet Fan Installation Distance

In this research, the visualization experiment for a scaling tunnel was conducted to establish the optimum fire protection system in tunnel fires. In order to find the optimal operating condition of jet fan with the fire, the characteristics of smoke propagation was considered to find the optimal operating condition of jet fan at the time of tunnel fire, the concentration of smoke was measured experimentally for various jet fan position and it's operating condition. As a result, when jet fan in the vicinity of fire operates at the upstream, the back-layering of the smoke should be considered with separation distance from the fire source. The distance between the jet fan and the fire should be longer than 50 m. On the other hand, when the vicinity jet fan operates at the downstream, the back-layering of smoke does not occur, but stratification is not maintained because the smoke dispersion occurs at the downstream due to the operation of the jet fan.
Chasing Sustainability

One of the solutions suggested for mitigating the detrimental effect of motor vehicles on society is to implement transit-oriented development (TOD). This type of development is intended to reduce automobile use and urban sprawl as well as to provide communities with more socially, environmentally, and economically sustainable neighborhoods that offer a variety of mobility choices. This study attempted to find out whether new residents adopted more sustainable modes of transportation after their relocation to a TOD. The analysis determined which factors influenced travel mode switching decisions by specifying a multilevel multinomial logistic regression model. Data for the analysis were drawn from a travel behavior survey conducted on residents in seven North American TODs in 2013. The results showed that newcomers adopted more sustainable travel modes for amenities and leisure trips after they relocated to a TOD but that they were less likely to do so for work and shopping trips. To encourage more sustainable travel modes, the study findings suggested that transit incentives coupled with workplace parking charges needed to be considered. Factors that were found to increase the probability that new TOD residents would switch to a more sustainable mode of transportation included their awareness of the environmental impact of each travel mode, the ease with which it was possible to walk through the neighborhood and to various destinations, and the proximity to transit stops. However, larger household size, homeownership, and the addition of a new car had negative impacts. The findings provided new insights into TOD planning and its link to travel behavior; these insights could benefit planners, engineers, and policy makers who have adopted the TOD approach to development with the goal of mitigating car usage.
Device to measure road dustiness on aggregate surfaced roads

Dust emissions from vehicles on unpaved roads can cause serious air pollution, impair visibility and safety for motorists, and pose an overall hazard to health. Appreciable maintenance dollars are spent each year for the control of dust on unpaved roads. Renewed interest in evaluating current dust control management has been stirred from the high maintenance costs, increased road user costs, loss of surface fines, and public awareness of pollution problems. Currently, decisions regarding the type, quantity, and time of application of a dust control method are based upon "human judgment", an informal, qualitative process. Studies on ways to reduce dust control costs are focusing on more efficient and uniform use of dust control methods. This requires a quantitative system to measure the level of road dustiness. With over 2.2 million miles of aggregate and earth-surfaced roads in the continental United States alone, there exists a significant road dust problem. The Cornell University Local Roads Program is developing a Road Dust Monitor capable of quantitatively measuring levels of road dustiness as part of a study sponsored by the USDA Forest Service. It is anticipated that this instrumentation will provide a repeatable and reliable method of measurement and form the basis for dust control management. The present prototype Road Dust Monitor consists of an eight-inch by twelve-inch duct in an L-shape, a transducer mounted on the duct, and an instrument package with an indicating meter. The duct and transducer are positioned behind the left-rear tire of a pick-up truck and the instrument package is mounted near the driver in the vehicle cab. Equipped with a light sending and receiving unit, the transducer shines an infrared light beam onto a reflector and this reflected light is detected by the receiver. As the moving vehicle kicks up dust from the road surface, dust passes through the duct, partially blocking the light beam and reducing the light reflected back to the receiver. The air opacity is converted to an analog voltage which is displayed on the indicating meter.
LOCALISATION OF UNDERWATER SENSOR NODES IN CONFINED SPACES

The aim of the project is to explore 3D localisation of a sensor ? pill? , contained in an enclosed vessel, using multiple acoustic transducers mounted on the pill? s surface. The thesis suggests strategies for placement, excitation and synchronisation of the transmitters on the pill and receivers on the vessel wall to deliver 3D localisation.Motivation for the project has emerged from the desire to develop wireless sensor networks to monitor the internals of industrial processes. A major challenge relates to the ability to accurately determine the location of the pill within the vessel, in the presence of multipath reflections.The main challenges relate to the determination of suitable transmission methodologies and synchronisation strategies to allow accurate localisation. The pill has to be a finite size in order to contain the required sensor hardware and transducers must be mounted on the surface of the pill such that signals are able to propagate directly to receivers on the vessel wall. This presents challenges in optimising the transmitter and receiver layout to maximise signal strength and also to determine how the separation of multiple transmitters on the pill impacts localisation accuracy.Time-Difference-of-Arrival (TDOA) has been investigated as a localisation technique, with simulations revealing that the separation of transmitters on the pill influences the accuracy. By modifying the standard TDOA equations with offset knowledge it has been demonstrated, in simulation, that this error can be reduced and by uniquely coding transmitters it is possible to resolve rotation of the pill in the vessel allowing further reduction in localisation error. Simulations have investigated how the location of receivers on the vessel wall influences the localisation error when the TDOA values are compromised by noise. It has been demonstrated that by mounting receivers at the extremities of the vessel the localisation error of the pill can be reduced.Work has also been undertaken to characterise both the vessel reflection properties and also the transmitter beam profile to allow a suitable transmitter layout on the pill to be determined. Simulations, supported by experimental results, have shown that a curved vessel surface can focus the reflected signals and therefore compromise peak detection signal methodologies. As a result amplitude thresholding is suggested for detecting received signals.The research is substantiated with a simple demonstrator that suggests, for both Time-of-Flight (TOF) and Time-Difference-of-Arrival techniques, that the location of the pill can be determined with an accuracy of � 5 cm throughout a 250 litre vessel.This is the first time that underwater localisation in a confined space using multiple transmitters on the surface of a sensor ? pill? has been reported.
Implementing Site-Based Management in the Rural South: The Process and the Challenge

School systems across the United States have implemented various forms of site-based management (SBM) to restructure their schools and ultimately improve education. Educators have been disappointed with the results of SBM and some have related its failure to the way SBM was implemented in many school systems. Too often, SBM was implemented as a top-down decision and viewed as a goal to obtain rather than a continuous learning process. This study was an ethnohistorical, single-case study of a small, rural elementary school in Southeast Georgia that implemented a form of site-based management, shared governance. Data collection consisted of a combination of qualitative techniques which included interview, observation, and a review of relevant documents. A combination of the constant comparison method of analysis and the use of the QSR Nud.ist computer program was used to process and analyze the data. This study emphasized the importance of the transformational leader and his/her ability to create conditions in schools which support change. Including teachers in the decision-making process created ownership, increased teacher satisfaction and was vital to sustaining the improvement process. Once teachers and principals collaborated together in decision making, traditional roles
Motivation Scale for Using Social Network Sites: Comparative Study between Facebook, Instagram, Twitter, Snapchat and LinkedIn

The increasing number of Social Network Sites (SNSs) and their changing nature raise the question of why people use them. This research has a twofold objective: first, to develop a motivation scale for using SNSs; second, to compare the motivational SNSs profile of Facebook, Instagram, Twitter, Snapchat and LinkedIn. Two studies on 364 university students, using exploratory and confirmatory factor analyses, established six motivations: entertainment, social interaction, seeking information, instrumental use, self-documentation and self-enhancement. Regressions then examined the association between motivations for using SNSs, social influence measures (descriptive and injunctive norms), and frequency of use of Facebook, Instagram, Twitter, Snapchat, and LinkedIn. The results showed that social norms complement the motivations to use SNSs. Twitter use was associated with an information-seeking SNSs motivational profile. LinkedIn, Facebook, and Instagram were associated with self-documentation on SNSs. Snapchat was rather associated with instrumental motivations on SNSs. However, while all SNSs were associated with descriptive norms, only Facebook and LinkedIn were associated with injunctive norms (i.e., peer pressure). The results are discussed by applying a cross-media perspective to new motives behind SNSs use.
Lean and Clean : the linking between Lean and Environment

Lean refers to the concepts of Lean operations, Lean principle, Lean philosophy, etc. It is what people often talk about in operation management. Clean refers to the concepts of being green, environmental friendly, less environmental impact, etc. These two words seem to be unrelated, but somehow connected. In this thesis, we explored the linking between Lean and environmental issues; analyze the possible benefits of coordination between Lean and environment. In the case study, we assessed the overall Lean performance of Alderholmens mekaniska, a local manufacturing company in Gavle, Sweden. This company was seeking for solutions of their environmental wastes in the production. We found that Lean activities could be used to achieve environmental objectives. Lean methods are capable of reducing environmental waste. To coordinate Lean and environmental issues could foster an organizational culture of continuous improvement in order to encourage people to improve for better overall performance; this also benefits the environmental performance. Based on the observation in the company, and the questionnaire made during an interview with their Lean specialist, we gave some proposals on Lean implementation with emphasis on environmental issues, in order to solve their problems of environmental wastes and, furthermore, improve the performance.
Electrical and magnetic faults diagnosis in permanent magnet synchronous motors

Permanent magnet synchronous motors (PMSMs) are an alternative in critical applications where high-speed operation, compactness and high efficiency are required. In these applications it is highly desired to dispose of an on-line, reliable and cost-effective fault diagnosis method. Fault prediction and diagnosis allows increasing electric machines performance and raising their lifespan, thus reducing maintenance costs, while ensuring optimum reliability, safe operation and timely maintenance. Consequently this thesis is dedicated to the diagnosis of magnetic and electrical faults in PMSMs. As a first step, the behavior of a healthy machine is studied, and with this aim a new 2D finite element method (FEM) modelbased system for analyzing surface-mounted PSMSs with skewed rotor magnets is proposed. It is based on generating a geometric equivalent non-skewed permanent magnet distribution which accounts for the skewed distribution of the practical rotor, thus avoiding 3D geometries and greatly reducing the computational burden of the problem. To diagnose demagnetization faults, this thesis proposes an on-line methodology based on monitoring the zero-sequence voltage component (ZSVC). Attributes of the proposed method include simplicity, very low computational burden and high sensibility when compared with the well known stator currents analysis method. A simple expression of the ZSVC is deduced, which can be used as a fault indicator parameter. Furthermore, mechanical effects arising from demagnetization faults are studied. These effects are analyzed by means of FEM simulations and experimental tests based on direct measurements of the shaft trajectory through self-mixing interferometry. For that purpose two perpendicular laser diodes are used to measure displacements in both X and Y axes. Laser measurements proved that demagnetization faults may induce a quantifiable deviation of the rotor trajectory. In the case of electrical faults, this thesis studies the effects of resistive unbalance and stator winding inter-turn short-circuits in PMSMs and compares two methods for detecting and discriminating both faults. These methods are based on monitoring and analyzing the third harmonic component of the stator currents and the first harmonic of the ZSVC. Finally, the Vold-Kalman filtering order tracking algorithm is introduced and applied to extract selected harmonics related to magnetic and electrical faults when the machine operates under variable speed and different load levels. Furthermore, different fault indicators are proposed and their behavior is validated by means of experimental data. Both simulation and experimental results show the potential of the proposed methods to provide helpful and reliable data to carry out a simultaneous diagnosis of resistive unbalance and stator winding inter-turn faults.
Identyfikacja zaburzeń elektromagnetycznych w torze zasilania reaktora plazmowego przy różnych mieszaninach gazowych

Streszczenie. Artykul dotyczy analizy przewodzonych zaburzen elektromagnetycznych badanych w torze zasilania reaktora plazmowego typu GlidArc. Reaktor jest silnie nieliniowym trojfazowym odbiornikiem. Jego stabilna praca zalezy od ukladu zasilania, a istniejące zaburzenia w ukladzie mogą wplynąc na niejednorodnośc generowania plazmy.
Perceived Factors Influencing Career Choice of the Undergraduate Students of Public Universities in Bangladesh

People around the globe, especially the educated ones, have become very much concerned about their careers. University students in Bangladesh are generally treated as one of the most serious segments having the intention for selecting career paths. In this regard, several factors are having different levels of influence over the career choice decision. This study aims at identifying and ranking the factors influencing the career choice of undergraduate students of public universities in Bangladesh. The study is quantitative where the perception of 384 undergraduate students of public universities of Bangladesh has been measured to find the level of influence of multiple factors influencing their career choice. A convenience sampling technique was used to choose the respondents. This study finds several factors having a different degree of impact on the choice of career. Sixteen factors have been identified through an extensive literature review based on which students’ perception was measured using a five-point Likert scale. Out of these 16 factors, 5 factors have been found strongly influential, 6 factors have been marked as moderately influential, and the rest 5 factors have been ranked as a low influential factor as perceived by the respondents. However, no established scale was utilized to rank the factors rather it has been performed based on mean value developing a scale using the rule of thumb. After a careful analysis, the personality of the students has been identified as the most influential factor for the career choice with a mean of 4.28 and standard deviation of . 962 whereas the influence of relative has been marked as the least influential factor with a mean of 2.67 and standard deviation of 1.426.