Miracle-dz/UniFAR-FTUs huggingface dataset:
Design and Performance Analysis of a Micro Aerial Vehicle concept

The guideline of the present paper is to single out the main problems concerning the Micro Aerial Vehicle design and to discuss the results of a reasonably accurate but time-saving strategy. The aerodynamic analysis, the propulsion system sizing and the performance evaluation have been carried out within the preliminary design phase of a fixed wing MAV, called MicroHawk. A software tool for 3D aerodynamic analysis has been implemented and the reliability of its results, concerning critical flight regimes and non-conventional configurations, has been tested by comparing them with experimental results. The propulsion system sizing has been faced with a numerical tool for DC motor propeller modeling; it is intended for preliminary estimation of the aircraft performances and the propulsive system initial sizing, when detailed and reliable data from experimental testing are not available. The DC motor model is strongly related to the dimensioning of the energy sources, that represents a challenging goal within narrow constraints in terms of weight and power required. Finally, in order to complete the aircraft performance analysis, a simulation model has been set up to provide the evaluation of the aircraft trim states. This preliminary study will be addressed to the analysis of the aircraft dynamics characteristics.
A New INS/VNS Integrated Navigation Model for Planetary Rovers

Inertial and vision integrated navigation (INS/VNS) is an important autonomous navigation method for planetary rovers. Traditional INS/VNS methods build state model based on the inertial error model, which consider the errors of vision system as random. However, the binocular cameras calibration errors will bring some constant errors to the vision system by the reconstruction process. A new INS/VNS model that adds the constant vision relative motion errors in the state is presented. The simulation results demonstrate that the presented model effectively improves the position and attitude accuracy compared with traditional methods.
Evolution of the Complicated Innovation Networks with Multi-Agent

Using the patents with multi-agent, we provide detailed insights into the cooperation of the marine industry, which is also a complicated innovation network with different agents, such as universities, research institutes, companies. Patent applications and publications are used as measures for the innovation output of the industry. We find that the cooperation in the four different stages is getting more and more intent, and companies are the biggest nodes in the networks. Effects are found that the nodes with more independent innovation would cooperate more with other nodes. Company nodes also tend to seek more partners in the interior, and have more cooperation with partners. But the internal cooperation is a little in the universities and research institutes.
A Partial Narrow Mesa Superjunction IGBT

APartial Narrow Mesa (PNW)SJ IGBT structure is proposed in this paper.With a non-connected SJ implemented inthe PNW IGBT,the proposed structure combines the injection enhancement effectsfrom bothPNW and SJ structure,which improvesthecarrier concentrationnear the cathode sideand reducesthe on-state voltage drop.Meanwhile, the implementationof theSJ structure improvesthe blockingcapabilityat an equivalent device thickness and reduces the turn-off loss. Therefore,the proposed structure has a better Vce and Eofftrade-off. These advantages have beendemonstratedby 2-Dnumerical simulation.
Coefficient quantization effects in cascade and parallel form realization of low-pass digital filters

Abstract This paper presents a comparison between cascade and parallel direct form canonic implementation of low-pass digital filters, when we regard the effects of coefficient quantization on the magnitude of the frequency response. A first-order sensitivity analysis is presented along with experimental results. Finally, a set of interesting observations for the four types of classical filter approximations are made.
Two factors in visual fatigue caused by stereoscopic HDTV images

It is said that visual fatigue caused by watching stereoscopic images is due to the conflict between convergence eye movement and accommodation functions. We studied the degree of visual fatigue in subjects watching HDTV stereoscopic images. The HDTV stereoscopic images used as visual stimuli contained only absolute, with no relative, parallax. In the experiments, images were displayed behind or in front of the screen by a 120-Hz time-sequential method. The examination of visual fatigue was carried out with a five-grade subjective evaluation test and measurement of the accommodation response after watching for one hour. We found that when stereoscopic HDTV images were displayed within the corresponding range of depth of focus, and remained static in the depth direction, the degree of visual fatigue was almost the same as that induced by watching images displayed at the depth of the screen. However, when images were displayed outside the corresponding range of depth of focus, visual fatigue was clearly induced. Moreover, we found that even if images were displayed within the corresponding range of depth of focus, visual fatigue was induced if the images were moved in depth according to a step pulse function.
The Goal of Motivation in the Military. Soldier Satisfaction or Soldier Performance

Abstract : Most studies to date dealing with worker motivation have concentrated on worker satisfaction, since most managers and researchers apparently assume a positive correlation between worker satisfaction and worker performance. This study was designed to by-pass this assumption and determine the correlation between the junior enlisted soldier's (E-1 through E-4) perceptions of 18 job- related factors, his/her level of performance and his/her level of absenteeism (AWOL). Again, this study approaches only the level of response-performance-AWOL correlations with no attempt at supporting or refuting the satisfacton-leads-to-performance assumption. Analysis revealed: A positive correlation between level of response and performance. Considerably higher response-performance correlations for Combat Arms and Combat Service Support than for Combat Support. No overall correlation between level of response and AWOL. However further analysis revealed a negative correlation between AWOL and three out of four factor sub-scales. A negative correlation between level of performance and AWOL.
Numerical Simulation and Size Optimization of the Flow Channel of Rectangular Micro-Channel Heat Sink

Because micro-channel has the advantages of small volume, low flow velocity and high efficiency, with the rapid development of miniaturization industry, micro heat sink is widely used. Previous studies have shown that the micro-channel heat transfer performance is mainly determined on its geometric and flow condition, and compared with triangle and trapezoid shape, rectangle structure has better heat transfer performance.Based on the finite element software ANSYS Workbench, micro-channel heat sink with the length of 40mm and different cross-sectional dimension are analyzed numerically, the dimension of micro-channel with smaller pressure drop and high heat transfer is gained. For the optimized model, when a given initial temperature 298K, flow rate of 1.5×10-4kg/s, the substrate give heat flux as 187500 W/m2. The heat flux of 5532W/m2 can be dissipated, the pressure drop is reduced to 230.2Pa, and the heat transfer rate is 5.254W, so this micro-channel heat sink has good working performance.
Vehicle Roll Stabilization Enhancement Using a Variable Stiffness Architecture: Kinematic Control

A variable stiffness architecture is used in the suspension system to counteract the body roll moment, thereby enhancing the roll stability of the vehicle. The variation of stiffness concept uses the “reciprocal actuation” to effectively transfer energy between a vertical traditional strut and a horizontal oscillating control mass, thereby improving the energy dissipation of the overall suspension. The lateral dynamics of the system is developed using a bicycle model. The accompanying roll dynamics are also developed and validated using experimental data. The positions of the left and right control masses are optimally allocated to reduce the effective body roll and roll rate. Simulation results show that the resulting variable stiffness suspension system has more than 50% improvement in roll response over the traditional constant stiffness counterparts. The simulation scenarios examined is the fishhook maneuver. © 2013 ASME
Resistance welding : fundamentals and applications

WELDING METALLURGY Solidification in Resistance Spot Welding Phase Transformations in RSW Cracking References ELECTROTHERMAL PROCESSES OF WELDING Introduction Electrical Characteristics of Resistance Welding Thermal Characteristics of Resistance Welding Heat Balance Electrode Life Lobe Diagrams References WELD DISCONTINUITIES Classification of Discontinuities Void Formation in Weld Nuggets Cracking in Welding AA6111 Alloys Cracking in Welding AA5754 Alloys References MECHANICAL TESTING Introduction Shop Floor Practices Instrumented Tests References RESISTANCE WELDING PROCESS MONITORING AND CONTROL Introduction Data Acquisition Process Monitoring References WELD QUALITY AND INSPECTION Weld Quality Attributes Destructive Evaluation Nondestructive Evaluation References EXPULSION IN RESISTANCE SPOT WELDING Influence of Expulsion on Spot Weld Quality Expulsion Process and Detection Expulsion Prediction and Prevention Examples References INFLUENCE OF MECHANICAL CHARACTERISTICS OF WELDING MACHINES Introduction Mechanical Characteristics of Typical Spot Welders Influence of Machine Stiffness Influence of Friction Influence of Moving Mass Follow-Up in a Welding Cycle Squeeze Time and Hold Time Measurement Other Factors References NUMERICAL SIMULATION IN RESISTANCE SPOT WELDING Introduction Coupled Electrical-Thermal-Mechanical Analysis Simulation of Contact Properties and Contact Area Simulation of Other Factors Modeling of Microstructure Evolution Examples of Numerical Simulation of RSW Processes References STATISTICAL DESIGN, ANALYSIS, AND INFERENCE IN RESISTANCE WELDING RESEARCH Introduction Basic Concepts and Procedures Experiments with Continuous Response Experiments with Categorical Responses Computer Simulation Experiments Summary References INDEX
UWB printed circular monopole antenna

A novel UWB (ultra‐wideband) printed monopole antenna consisting of a circular monopole patch and a trapeziform ground plane with a tapered CPW (coplanar waveguide) feeder in the middle is introduced. By means of the trapeziform ground plane and the tapered CPW feeder, the impedance bandwidth is broadened greatly. Both the simulated and experimental results are presented, showing good agreement and verifying the validity of the design. The experimental results demonstrate that this antenna achieves an 11.3:1 ratio bandwidth of VSWR ≤ 2, covering frequencies from 0.79 to 9.16 GHz, and exhibits an omnidirectional radiation pattern with a simple structure, which is attractive for UWB communication applications. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1532–1534, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21687
microRNA mir-598-3p mediates susceptibility to stress enhancement of remote fear memory

microRNAs (miRNAs) have emerged as potent regulators of learning, recent memory and extinction. However, our understanding of miRNAs directly involved in regulating complex psychiatric conditions perpetuated by aberrant memory, such as in posttraumatic stress disorder (PTSD), remains limited. To begin to address the role of miRNAs in persistent memory, we performed small-RNA sequencing on basolateral amygdala (BLA) tissue to identify miRNAs altered by auditory fear conditioning (FC) one month after training. mir-598-3p, a highly conserved miRNA previously unstudied in the brain, was downregulated in the BLA. Further decreasing BLA mir-598-3p levels did not alter the expression or extinction of the remote fear memory. Given that stress is a critical component in PTSD, we next assessed the impact of stress-enhanced fear learning (SEFL) on mir-598-3p levels, finding the miRNA is elevated in the BLA of male, but not female, mice susceptible to the effects of stress in SEFL. Accordingly, intra-BLA inhibition of mir-598-3p interfered with expression and extinction of the remote fear memory in male, but not female, mice. This effect could not be attributed to an anxiolytic effect of miRNA inhibition. Finally, bioinformatic analysis following quantitative proteomics on BLA tissue collected 30 days post-SEFL training identified putative mir-598-3p targets and related pathways mediating the differential susceptibility, with evidence for regulation of the actin cytoskeleton.
Effectiveness of Online Learning System as a Supplemental Pedagogical Tool

Learning can be extended from the traditional face-to-face classroom experience towards the virtual pedagogical environment. This study evaluated the effectiveness of the Misamis University Online Learning Environment (MUOLE) established as a supplemental tool for classroom learning in all information technology and computer science subjects. A total of 342 students filled out the researcher-made questionnaire that served as the evaluation tool. Results showed that the students perceived the MU-OLE as an effective Online learning system in downloading instructional materials and assignments, taking quizzes and examinations, submitting requirements, checking files and accessing scores from their secured personal account. It further showed that integrating online learning system with traditional teaching gives the students a great deal of convenience and ease in enhancing learning. Keywords: content management system, evaluation, web-based learning, web- based tool.
Success Stories of Satellite Radar Altimeter Applications

For nearly three decades, satellite nadir altimeters have provided essential information to understand, primarily ocean, and also, inland water dynamics. A variety of parameters can be inferred via altimeter measurements, including sea surface height, sea surface wind speeds, significant wave heights, and topography of land, sea ice, and ice sheets. Taking advantage of these parameters with the long record of altimeter data spanning multiple decades has allowed a diverse range of societal applications. As the constellation of altimeter satellites grows, the proven value of the missions to a diverse user community can now be demonstrated by highlighting a selection of verifiable success stories. In this paper, we review selected altimeter success stories which incorporate altimetry data, alone or in conjunction with numerical models or other Earth observations, to solve a key societal problem. First, we define the problem or the key challenge of each use case, and then we articulate the uptake of the successful altimeter-based solution. Our review revealed steady progress by scientific and stakeholder communities in bridging the gap between data availability and their actual uptake to address a variety of applications. Highlighting these altimeter-based success stories can serve to further promote the widespread adoption of future satellite missions such as the Surface Water and Ocean Topography (SWOT) mission scheduled for launch in 2022. Knowledge of the breadth of current utility of altimeter observations can help the scientific community to demonstrate the value in continuing radar altimeter and similar missions, particularly those with expanded capabilities, such as SWOT.
Interpolating ring VCO with V-to-f linearity compensation

The nonlinearity of interpolating ring voltage controlled oscillators is inherent because the interpolation is linear in delay. Linearity can be restored with a correction based on the predictable curvature of an unbalanced Gilbert translinear cell. Experimental results show V-to-f linearity better than 0.2% over a +or-10% frequency range about 155 MHz. >
MV inverter stack topologies

Over the last few years, several medium-voltage, pulse-width modulated, voltage source inverter drives have been introduced to the market. These drives are based on different power stack topologies and different power devices. This article reviews various MV PWM VSI power stack topologies in the power range 2-7 MW. It also examines and compares a number of different high-power, IGBT-based, converter stack designs suitable for 4.16 kV AC RMS output voltage.
Hybrid MoM–PO analysis of multilayered SIW slot antenna with a dielectric slab radome

A fast and efficient full-wave hybrid method for the analysis of a multilayered substrate integrated waveguide (SIW) based slot antenna/array radiating into a dielectric slab radome is presented. The antenna structure is modeled as a stacked parallel-plate waveguide hosting metallic posts and coupling and/or radiating slots. To account the radome effects on the SIW antenna, the physical optics method in conjunction with three-dimensional ray trace technique are used to analyze a dielectric slab radome staked on the aperture of the antenna. The field in the SIW structure is expressed by using an expansion in terms of vectorial cylindrical eigenfunctions. Enforcing the boundary conditions on posts yield the scattering amplitude, while slots are modeled as unknown magnetic currents which are found by solving the integral equation derived from the continuity of the field on the slot surface. A double-layered SIW cavity backed slot antenna radiating into a dielectric slab radome is analyzed, and the results compared with high frequency simulation software (HFSS) simulations. It will be shown that the proposed method is fast and efficient and gives results in very good agreement with the most common simulation tools.
Strategic Plan for Southwest Indian Community's Construction Business

The Salt River Pima-Maricopa Indian Community (SRPMIC) of Maricopa County, Arizona, has determined that it needs to further the economic and social welfare of the community. The community has further determined that these needs might be most efficiently met by a profitable business that garners revenues to the community and income to the employees, furthers the community members' skills, and provides employment. The community presently has several entities that perform construction work on the reservation. Because of these successful operations, the SRPMIC believes that it can enter the market of supplying construction services to clients off the reservation. Determining the opportunities and threats in the marketplace, this study analyzes the potential for success of the community performing construction work off the reservation and outlines a strategic plan that describes the steps for implementing a business enterprise.
Pneumatic artificial muscles for trailing edge flap actuation: a feasibility study

In this study a novel aircraft trailing edge flap actuation system was developed and tested. Pneumatic artificial muscles (PAMs) were used as the driving elements of this system to demonstrate their feasibility and utility as an alternative aerospace actuation technology. A prototype flap/actuator system was integrated into a model wing section and tested on the bench-top under simulated airloads for flight at 100 m s−1 (M = 0.3) and in an open-jet wind tunnel at free stream velocities ranging up to 45 m s−1 (M = 0.13). Testing was performed for actuator pressures ranging from 0.069 to 0.62 MPa (10–90 psi) and actuation frequencies from 0.1 to 31 Hz. Results show that the PAM-driven trailing edge flap system can generate substantial and sustainable dynamic deflections, thereby proving the feasibility of using pneumatic artificial muscle actuators in a trailing edge flap system. Key issues limiting system performance are identified, that should be resolved in future research.
Impact of modelling approximations in supply chain analysis – an experimental study

This paper presents a study of the comparison of the quality of results obtained at different levels of detail using a supply chain simulation. Analysis of supply chain is typically carried out using aggregated information to maintain the level of complexity of the simulation model at a manageable level. Advances in simulation have provided the ability to build comprehensive (detailed), modular models. The quantitative effect of detailed modelling on the corresponding analysis is investigated in this paper. A three-echelon supply chain is analysed using simulation models of varying levels of detail. Using each of these models, four sets of intensive experiments are performed. The first experiment intends to test whether the supply chain dynamics themselves depend on the modelling accuracy that represents the supply chain. The second and third experiments are conducted to test whether the effectiveness of the strategies employed to reduce the supply chain dynamics vary depending on the type (different detail) of model representing the supply chain. In the fourth experiment, statistical techniques are employed to identify which modelling aspect has the most influence on the supply chain dynamics. It is found that the approximations used in modelling, such as delays and capacity, have more impact on the outcome of supply chain analysis than end customer demand. Evidence that both the basic problem (supply chain dynamics) and the solution (strategy to reduce the dynamics) are greatly influenced by the modelling accuracy are presented.
Ropivacaine:An Unusual Cause of Neuroleptic Malignant-Like Syndrome

Ropivacaine is commonly used for post-operative pain management. We describe a case of neuroleptic malignant-like syndrome in a woman administered ropivacaine delivered using a drug infusion balloon. The presenting symptoms were confusion, agitation and fever. Blood analysis showed elevated C-reactive protein, leucocytosis and increased creatine phosphokinase. As intoxication was suspected, ropivacaine was suspended and the patient gradually improved. Possible leakage of ropivacaine into the intrathecal space may have resulted in central nervous system toxicity. LEARNING POINTS It is important to be aware of the secondary effects of common drugs. The differential diagnosis should always include side effects and drug interactions. Intoxication can lead to poor outcomes, so early recognition is key.