Miracle-dz/UniFAR-FTUs huggingface dataset:
Dual Purpose Design of Small Wind Turbine Blades

Experimental studies of the starting behaviour of small wind turbines have shown that the initial “idling period”, characterised by small rotor acceleration, is usually much longer than the subsequent period of rapid accleration to reach operational rotor speed. Idling obviously reduces the power generation potential of any turbine. The experimental results also imply that most starting torque is generated near the hub, whereas power-producing torque is concentrated near the tip. Therefore this paper considers the computational design of blades for small wind turbines for the dual purposes of (i) efficient power production at rated wind speeds and (ii) rapid starting at smaller wind speeds. Standard blade element theory is used to determine the power coefficient, which is the first objective function to be maximised. A modified blade element method gives the start, whose inverse is the second objective function. During the idling period, the blade angles of attack are relatively large, allowing the lift and drag to be modelled using “generic” flat-plate equations with a small adjustment for the particular aerofoil. No power is extracted from the wind while the blades are accelerated by the aerodynamic torque. Starting is deemed to be complete at a tip speed ratio representing the end of the idling period, which considerably less than the period for power generation. The design is by “differential evolution”. An initial population of blade types is generated randomly and allowed to evolve through random modification and selection of the fittest blades to comprise the next generation. The blade “genes” are the chord and pitch of each blade element; the aerofoil section is the same for all elements and all blades. In multi-objective optimisation, most interest focusses on the members of the population which have at least one objective function greater than every other member, as the final design is usually chosen from these blades. The geometry of the best power extracting blade obtained from the evolutionary optimisation was compared with that arising from standard blade element theory. Good agreement was found for the case of an aerofoil having a pronounced peak in its lift to drag ratio but only a small Reynolds number dependence in the lift coefficient at which the ratio is a maximum. Using an aerofoil with a much flatter lift to drag characteristic, the evolutionary method easily adapted to the significant Reynolds number dependence of the aerofoil characteristics. The effects of blade inertia and the resistive torque of the generator and drive train are also considered. In all cases studied, the best power-producing blade always had relatively poor starting performance, but it was usually possible to choose an alterntive blade with only a small reduction in power output but with a starting time decreased by a factor of around two.
Experimental linewidth-insensitive coherent analog optical link

We constructed an experimental linewidth-insensitive coherent analog optical link. The transmitter utilizes an external electro-optic amplitude modulator and a semiconductor laser. The receiver consists of a heterodyne front-end, a wideband filter, square law detector and narrowband lowpass filter. We performed experimental measurements and theoretical analyses of the spurious-free dynamic range (SFDR), link gain and noise figure for both the coherent AM and the direct detection links; we investigated the dependencies of the foregoing parameters on the received optical signal power, laser linewidth, IF bandwidth, and the laser relative intensity noise (RIN). By selecting a wide enough bandpass filter, we made the coherent AM link insensitive to laser linewidth. The coherent AM link exhibits a higher SFDR than the corresponding direct detection link when the received optical signal power is less than 85 /spl mu/W. The noise figure for the coherent link is greater than that for the direct detection link under all conditions investigated. For received optical signal powers greater than 4 /spl mu/W, the link gain for the direct detection link is greater than that for the coherent AM link. The following are the link parameters that have been achieved for the coherent AM link investigated: SFDR=88 dB/spl middot/Hz/sup 2/3/, link gain=-25 dB and noise figure=78 dB; this performance has been obtained with a received optical signal power of 85 /spl mu/W, and a local oscillator power at the photodetector of 228 /spl mu/W. The link performance can be further improved by auxiliary subsystems such as a balanced receiver and impedance matched transmitter and receiver ends; and/or by using better optical and electrical devices like higher power lasers, linearized optical modulators, low-noise and high gain RF amplifiers, and optical amplifiers,. >
Improving the Economics of Ground Source Heat Pumps through a Community Energy Utility

Ground source heat pumps (GSHP) are an efficient, reliable, and cost-effective technology capable of achieving significant reductions in the carbon footprint of cities. However, their initial costs are viewed as prohibitively expensive by most commercial developers. In this paper we assess the value of looking beyond a single developer capitalizing on economies of scale and divergent loads. We show that these can lead to dramatically lower capital and operating costs. Furthermore, municipal governments have eminent domain over abundant public lands allowing further cost cutting through horizontal heat-exchange networks. Finally, municipal governments through their zoning regulations can encourage the colocation of complimentary loads on the network. These circumstances may call for the adoption of a development model informed by other natural resource development initiatives. This paper explores how capturing the full network benefits associated with a GSHP infrastructure lowers overall capital costs, improves system economics and can accelerate the diffusion of this technology leading to significant GHG emission reductions while improving adaptation to heat waves.
Low Temperature Is Critical for Jujube Grafting Success in Frost-prone Northern New Mexico

The increased popularity of jujube (Ziziphus jujuba) combined with the difficulty of grafting have limited supplies of grafted trees in the United States. From 2011 to 2020, grafting was practiced for cultivar amplification after importation and cultivar trials in frost-prone northern New Mexico. Grafting success was related to not only grafting techniques but also climate factors. Bark grafting, whip/tongue grafting, and cleft grafting were commonly used in nurseries. Low temperatures had a critical role in jujube grafting success in marginal regions and were more important than the grafting technique. If frost occurs before or near the leafing time, then grafting should be delayed until the rootstocks are determined to be healthy and alive. If frost occurs after grafting, then grafting failure and/or thin and small plant percentages increased. If only branchlets appear after grafting, then pinching branchlets could stimulate new shoot growth.
Cardiac arrest as first presentation of arrhythmogenic left ventricular cardiomyopathy due to Filamin C mutation: a case report

Abstract Background Arrhythmogenic left ventricular cardiomyopathy (ALVC) is a rare form of arrhythmogenic cardiomyopathy characterized by fibrofatty replacement of left ventricular myocardium, malignant arrhythmia, and sudden cardiac death. The definition incorporates several genetic causes, including pathogenic variation in the Filamin C gene (FLNC). Although awareness of ALVC has improved, identification remains challenging and diagnostic criteria continue to evolve. Case summary A 50-year-old athletic male was admitted following an out-of-hospital cardiac arrest due to ventricular tachycardia (VT) whilst playing football. Coronary angiography revealed unobstructed epicardial vessels and the diagnosis of ALVC was suggested by cardiovascular magnetic resonance imaging, which demonstrated a mildly dilated and moderately impaired left ventricle with epicardial late gadolinium enhancement in the basal to mid-lateral walls and subendocardial septum. Initial testing with a cardiomyopathy and arrhythmia gene panel was negative but extended testing uncovered a likely pathogenic variant in FLNC. Subsequently, the patient experienced a recurrence of sustained VT necessitating implantable cardioverter-defibrillator (ICD) therapies, ultimately undergoing a combined epicardial and endocardial VT ablation 4 years after presentation. Six months post-ablation, he was asymptomatic and his arrhythmia rendered quiescent. Discussion Arrhythmogenic cardiomyopathy should be considered in the evaluation of an initially unexplained cardiac arrest. This case characterizes the clinical features of a patient with FLNC cardiomyopathy and emphasizes the utility of genetic testing using modern gene panels in patients with comparable phenotypes. We also demonstrate that optimal medical therapy with antiarrhythmic drugs, exercise restriction, ICD insertion, and catheter ablation can be useful in the management of ALVC with positive outcomes
Nonlinear finite element simulation of thermoviscoplastic deformation of C4 solder joints in high density packaging under thermal cycling

A nonlinear finite element model has been used to simulate the thermally induced viscoplastic deformation of the controlled collapse chip connection (C4) solder joints in a high density single chip module (SCM). The dependence of solder joint deformation on the tin content was demonstrated for various lead-rich Pb-Sn alloys with the tin content varying from 2 wt% to 10 wt%. A thermoviscoplasticity theory was introduced for modeling inelastic stress-strain response of the Pb-Sn alloys. In the theory, the creep and plasticity were separately considered and formulated. The Garafalo hyperbolic sine law was used to model the creep behavior, while the Prandtl-Reuss equation was used for the rate independent plastic deformation. The modeled SCM consists of a 5 mm silicon chip attached to 50 mm alumina substrate by an array of C4 with diameter of O.1 mm on a 0.2 mm I/O pitch. A cyclic temperature load of 0 to 100/spl deg/C at frequency of 3 cycles per hour was applied to the SCM, and a nonlinear finite element program ABAQUS was used to numerically study the effect of the tin content on the stress-strain response of the C4. It is concluded that the decrease of the tin content induces a decrease of the equivalent creep strain and Mises stress, but an increase of the equivalent plastic strain for the edge C4 in the SCM. <<ETX>>
Does participation in structured group supervision impact experiences of transition to the workforce?: A survey of psychology registrars

ABSTRACT Objective The transition to the workforce can be stressful for psychology registrars. Supervision can be a protective factor during this transition. However, the incremental benefit of adding structured group supervision to individual supervision remains unclear. We aimed to explore the impact of registrars’ participation in structured group supervision offered within Australian Health services. Method We surveyed Australian psychology registrars who had and had not participated in a structured group supervision programmes about their experiences and satisfaction with supervision, and its impact on development of foundational competencies and transition to professional work roles. Results Participants were 63 psychology registrars (95% in clinical psychology and clinical neuropsychology). Group comparisons using independent-samples t-tests revealed that registrars who had participated in structured group supervision (n = 32) were more confident in the key foundational competencies of “communication and interpersonal relationships” (d = .53) and “intervention strategies” (d = .57), and felt more supported by their workplace (d = .73), than participants with no structured group supervision (n = 31). Conclusions Structured group supervision appears to offer additional work role adjustment benefits for psychology registrars. Further studies are needed on the structured group supervision experience for Australian early-career psychologists to guide future implementation of these programme across health services. KEY POINTS What is already known about this topic: (1) The transition to the workforce is a stressful time for graduates. (2) Supervision is an essential part of psychology training that helps to develop skills and confidence in practitioners. (3) There are a range of benefits of group supervision including peer feedback and enhanced public speaking skills.What this topic adds: (1) Specific additional benefits of structured group supervision include feeling more supported by the workplace and being better able to meet registrar program requirements. (2) Structured group supervision programs may enhance perceived development of foundational competencies, including communication and interpersonal relationships and intervention strategies. (3) Provision of structured group supervision programs by Australian health services could help attract and retain a loyal early-career psychology workforce who feel valued and more confident.
Theoretical investigations of a proposed series integration of resonant tunneling diodes for millimeter-wave power generation

The double-barrier quantum-well resonant tunneling diode (RTD) has great potential for power generation at millimeter-wave frequencies. If a number of RTDs are integrated in series, the integrated device can greatly increase the total output power and help remove the problem of low-frequency spurious oscillations associated with a single RTD. The feasibility of such a series integration scheme is investigated. The advanced monolithic nonlinear transmission line (NLTL) generating picosecond voltage shock waves can be used to initiate oscillation in such series-integrated RTDs to overcome the DC instability. The large-signal RF characteristics of the series-integrated RTDs are analyzed and simulated, including transit time effects in the depletion region. Available GaAs-AlAs RTD data was used to obtain computer simulation results showing that a total CW output power of about 0.1 W with a DC-to-RF conversion efficiency of about 8% can be generated to a 5- Omega load at 100 GHz, if ten such RTDs are integrated in series. >
EFFECT OF AQUEOUS PSIDIUM GUAJAVA LEAVES EXTRACT AS ANTI - HYPERGLYCEMIC AGENT

Background: Hyperglycemia is one of the serious problems that affect humans' lifestyle and require special treatments. Incorrect use of synthetic drugs results in side effects and other problems. Diabetic patients need safer and more effective antidiabetic drugs that decrease diabetic complications. Natural products are harmless due to conventional medicine can be inefficient (e.g. side effects and ineffective therapy). Objective: Evaluate antihyperglycemic activity of aqueous leaves extract of Psidium guajava in hyperglycemic rats. Methods: Adult males albino rats, weighting (140-150 grams) were assigned to one of four groups of six animals each (n= 6). Hyperglycemia induced by single dose intraperitoneal injection of STZ NA (60 mg/kg 110 mg/kg, b.wt i.p.), the control groups was given distilled water, the experimental sub-groups were started one week later of STZ induction, then treated once daily by aqueous extract of Psidium guajava leaves until the end of experiment. Initially, blood samples were taken for measured glucose levels and HbA1c. The body weight, urine sugar and blood glucose levels were checked regularly. Results: The polyphenolic of guava leaves extract was found to be (227.63 mg GAE /g. Ex), while flavonoids content was (79.96 mg QE/g. Ex). However, it caused a significant decrease in blood glucose levels and HbA1c and other glycemic indicators. Conclusion: aqueous extract of Psidium guajava leaves possess significant antidiabetic, and effective in lowering blood glucose level but lack hypoglycemic effect in hyperglycemic rats. Further studies warranted to elucidate possible mechanism(s) of action of the plant material.
Low-cost flip-chip on board

For hand-held communication products, like the DECT telephone system, flip-chip on board offers minimization of both the package size and the occupied area on the boards. As a result of the reduction in interconnection lengths, the self-inductance is reduced. For high volume production, the compatibility of the flip-chip mounting technique with standard surface mount technology (SMT) reflow is essential. During reflow, the eutectic PbSn bump wets along the copper track, so the stand-off between integrated circuits (IC's) and the board is accurately defined by the layout of the board and the dimensions of the bump. The eutectic PbSn flip-chip processing is evaluated by impedance and cross-talk measurements, and in several reliability tests. For the electrical measurements, a zero-IF front-end IC is used. Wide-band measurements of the input impedance showed that the residual parasitics associated with the eutectic PbSn bumps are negligible compared with the parameters of the internal IC components. To accommodate the residual stresses from differences in coefficient of thermal expansion (CTE), the gap between the IC and the substrate is underfilled. This underfill material marginally affects the electrical behavior of the IC at frequencies up to a few GHz. As expected, a slight increase in the residual capacitance is observed. The effect of the underfill is studied by both temperature cycle and shock tests; cumulative failure distributions have been plotted. Results show that the adhesion properties and flow characteristics of the underfill material are the dominating factors for the number of cycles to failure. By selecting the proper underfill and curing conditions, the eutectic PbSn flip-chip construction can meet the test requirements for consumer communication products.
Part III: Recovery-Oriented Practices in Community Mental Health and Substance Abuse Services: A Meta-Synthesis

In recent decades, recovery-oriented practice has become the major approach in mental health and substance abuse care, especially in community mental health and substance abuse services. Various models of recovery-oriented practice have come to form the basis of the integration of this approach in service settings. The study aims to elucidate the characteristics of recovery-oriented practice as experienced by participants in the practice. The method used was a qualitative meta-synthesis that integrated the findings from thirty-four empirical papers published by one research group. Four meta-themes were developed: (a) helping and supporting, (b) collaborating and relating, (c) identity integration in practice, and (d) generating hope through nurturing and helping. These themes emphasize the value of relationships and connectedness, contextuality, and resources that can be mobilized in practice. The results emphasize the need to incorporate the elements in the four major themes as “working capital” for practitioners to realize recovery-oriented practice. The concepts of personal, social, and economic capital as working capital are elaborated, drawing from the meta-themes as the basis for recovery-oriented practice in mental health and substance abuse services.
The Effect of Public Service Motivation on Job Performance of Public Servants in Vietnam: The Role of Mediation of Job Satisfaction and Person-organization Fit

ABSTRACT Many empirical studies on the effect of public service motivation (PSM) on job performance have been carried out using self-report performance, but little has been made of two dimensions of performance, called task and contextual performance, for measurement job performance. The current article, therefore, examines the relationship of PSM with job performance, combining task and contextual performance, through the mediating role of job satisfaction and person – organization fit (P-O fit). The data analysis is based on a questionnaire survey of public servants under the People’s Committee of Ho Chi Minh City, Vietnam. It was found that PSM has a directly positive impact on job performance. In addition, using the mediation effect of job satisfaction and person-organization fit in the relationship of PSM with job performance provides more robust evidence of this relationship.
The Shape of Nasopalatine Canal as a Determining Factor in Therapeutic Approach for Orthodontic Teeth Movement—A CBCT Study

The aim of this study was to evaluate the impact of the nasopalatine canal (NPC) shape and its morphometric characteristics on expected teeth movement by assessing the distance to maxillary central incisors (MCIs) according to NPC type. The retrospective study was performed on 133 CBCT images. The following parameters were obtained: the antero-posterior diameter (A-P) of the nasal foramen (NF), canal length, A-P and mediolateral diameter (M-L) of the incisive foramen (IF), and the distance between NPC and MCIs. With the exception of being hourglass-shaped, each NPC shape showed specific impacts of NPC shape on the relationship between NPC diameters at different sections and distances to MCIs. In banana-shaped NPC, a significant correlation was observed for A-P NF diameter, while in cylindrical-shaped NPC, a significant correlation was observed for NPC length. The increase in M-L IF, A-P IF, A-P NF, and NPC length in funnel-shaped NPC may be a risk factor for interventions that could result in teeth movement. According to the results, it seems that the proposed methodological approach for analysis of CBCT slices in the anterior maxilla may offer detailed information that could be an additional tool in planning the procedures that result in expected teeth movement.
Attitudes of consumers on E-waste management in Greece

Waste from electric and electronic equipment (WEEE) is the fastest growing waste stream in the European Union. WEEE may cause environmental problems due to its hazardous materials contents. On the other hand, recycling of WEEE is an important issue, not only from the point of waste treatment, but also from the aspect of recovering valuable materials. This paper presents data on WEEE generation and the status of WEEE recycling in Greece, in its current early stage. It also presents the attitudes and behaviour of Greek consumers regarding WEEE management practices. A field survey based on a closed-type questionnaire was conducted. The survey took place in the city of Athens in the first months of 2005. The main results of the study indicate that WEEE generation in Greece will continue to grow and that people are willing to get involved provided that the needed infrastructure is established.
Numerical Thermal Analysis of Fuse Mounted on Fuse Holder

This paper presents a three-dimensional thermal model of an electric fuse mounted on its fuse holder. The proposed model can be used in steady-state conditions but also during transient operating conditions. A comparison at the same ambient temperature and load current, between the thermal model of the fuse with and without its fuse holder, has been performed. In the case of load current and ambient temperature variation, a thermal analysis at different voltage drop values on the fuse contacts has been done. For different thermal load on fuse contacts and current variation, the temperature distribution along the fuse link, has been investigated. The experimental tests led to the validation of the proposed three-dimensional thermal model of the fuse mounted on its fuse holder.