Miracle-dz/UniFAR-FTUs huggingface dataset:
Analysis and Design of a Soft-Switched PWM Sepic DC-DC Converter

This paper proposes a new soft-switched Sepic converter. It has low switching losses and low conduction losses due to its auxiliary communicated circuit and synchronous rectifier operation, respectively. Because of its positive and buck/boost-like DC voltage transfer function (M=D/(1-D)), the proposed converter is desirable for use in distributed power systems. The proposed converter has versions both with and without a transformer. The paper also suggests some design guidelines in terms of the power circuit and the control loop for the proposed converter.
Wake meandering: a pragmatic approach

The phenomenon of wake meandering is long known empirically, but has so far not been treated in a satisfactory manner on the wind turbine load modelling side. We present a consistent, physically based theory for wake meandering, which we consider of crucial importance for the overall description of wind turbine loadings in wind farms. In its present version, the model is confined to single wake situations—including a simple heuristic description of wake interaction with a reflecting surface. Contrary to previous attempts to model wind turbine wake loading, the present approach opens for a unifying description in the sense that turbine power and load aspects can be treated simultaneously. This capability is a direct and attractive consequence of the model being based on the underlying physical process, and it potentially opens for optimization of wind farm topology, wind farm operation, as well as control strategies for the individual turbine. The application of the proposed dynamic wake meandering methodology with existing aeroelastic codes is straightforward and does not involve any code modifications. The strategy is simply to embed the combined effect of atmospheric turbulence, added wake turbulence and the intermittent ‘turbulence contribution’, caused by wake meandering, in files replacing the traditional turbulence file input to aeroelastic computations. Copyright © 2008 John Wiley & Sons, Ltd.
Intermittent Dissipation at Kinetic Scales in the Turbulent Reconnection Outflow

Based on the unprecedented high‐resolution data from the Magnetospheric Multiscale mission, we investigate the energy dissipation in turbulent reconnection outflow during turbulent magnetic reconnection in the terrestrial magnetotail. It is found that this reconnection outflow has plenty of intermittent structures at kinetic scales accompanied by abundant current filaments. Strong energy dissipation occurs in the intermittent structures with a high partial variance of increments index, and the regions with strong current filaments. Further analyses reveal that electron heating with the presence of increase in electron temperature occurs in the intermittent structures and the regions with strong currents. This electron heating is more significant in the component parallel to the magnetic field. Our observations demonstrate that intermittent dissipation at kinetic scales occurs in the turbulent reconnection outflow.
Tertiary treatment of municipal wastewater using bioflocculating micro-algae

Design criteria of a pilot plant for treating secondary municipal effluents using filamentous, bioflocculating micro-algae were evaluated. Using a sequential batch reactor, the best removal rate of ammonia nitrogen was reached for 25% draw volume; at 20–22 °C, up to four cycles per day could be achieved giving a removal efficiency of approximately 2 g of N per day and per square meter of basin (200 mm deep) with negligible nitrogen residual; increasing the water level by increments of 200 mm (from 200 to 600 mm) increased the N removal efficiency in a way similar to an increase in the number of renewals per day on a 200 mm deep basin. The dominant micro-algae (Chlorhormidium) was heavily influenced by the water temperature. Key words: micro-algae, municipal wastewater, water treatment, ammonia nitrogen, removal rate, removal efficiency.
Design and fabrication of organic complementary circuits

We have used a simple model description of single field effect transistor characteristics to design organic complementary circuits ranging in complexity from simple inverters through 48-stage shift registers and three-bit row decoders. The circuits were fabricated using standard silicon photolithographic techniques to define the metal, insulator, and interconnect levels. The ohmic source and drain contacts and part of the interconnect metallization were formed by electroless/immersion deposition of Ni-P/Au on prepatterned TiN. The n-type and p-type organic semicondcutors were evaporated onto these substrates to complete the circuits. Measured circuit characteristics were in reasonable agreement with simulations based on the simple device model.
The Ring-Centered Waveguide Flange for Submillimeter Wavelengths

The standard UG-387 waveguide flange (MIL-DTL-3922/67C) is not well suited for frequency bands above ~110 GHz. The proposed ring-centered flange has a precisely machined boss centered on the waveguide aperture and is aligned by a ring which centers the bosses of two mating flanges. The flange is compatible with the UG-387 type, allowing components with the new flange to be connected directly to older components without adapters. Like the UG-387 standard, it is sexless and the contact surfaces are not recessed, which facilitates cleaning and lapping to repair damage. The maximum misalignment between waveguides using the new flange should be < 0.001" (25 μm), corresponding to a worst-case return loss of 26 dB in the WR-1.9 band (400-600 GHz), or 16 dB in the WR-1.0 band (750-1100 GHz). A miniature version of the ring-centered flange is also proposed.
Compact ultra‐wideband planar tapered slot antenna for use in a microwave imaging system

The design of an ultra‐wideband planar tapered slot antenna for use in a circular cylindrical microwave imaging system is presented. The antenna was designed assuming high dielectric substrate material Rogers RT6010LM to achieve its compact size. The developed antenna element (50 × 50 mm2) features a 10‐dB return loss bandwidth from 2.75 GHz to more than 11 GHz. The gain of the antenna is between 3.5 and 9.4 dBi over the 3–10 GHz band. The experimental tests showed that the manufactured antenna element supports transmission of narrow pulses with negligible distortions, as required in the microwave imaging system. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2212–2216, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21906
Thermal Evaluation of Fiber Bragg Gratings at Extreme Temperatures

The development of integrated fiber optic sensors for use in aerospace health monitoring systems demands that the sensors be able to perform in extreme environments. In order to use fiber optic sensors effectively in an extreme environment one must have a thorough understanding of the sensor's capabilities, limitations, and performance under extreme environmental conditions. This paper reports on our current sensor evaluation examining the performance of freestanding fiber Bragg gratings (FBG) at extreme temperatures. While the ability of FBGs to survive at extreme temperatures has been established, their performance and long term survivability is not well documented. At extreme temperatures the grating structure would be expected to dissipate, degrading the sensors performance and eventually ceasing to return a detectable signal. The fiber jacket will dissipate leaving a brittle, unprotected fiber. For FBGs to be used in aerospace systems their performance and limitations need to be thoroughly understood at extreme temperatures. As the limits of the FBGs performance are pushed the long term survivability and performance of the sensor comes into question. We will not only examine the ability of FBGs to survive extreme temperatures but also look at their performance during many thermal cycles. This paper reports on test results of the performance of thermal cycling commercially available FBGs, at temperatures up to 1000 C, seen in aerospace applications. Additionally this paper will report on the performance of commercially available FBGs held at 1000 C for hundreds of hours. Throughout the evaluation process, various parameters of the FBGs performance were monitored and recorded. Several test samples were subjected to identical test conditions to allow for statistical analysis of the data. Test procedures, calibrations, referencing techniques, performance data, and interpretations and explanations of results are presented in the paper along with directions for future research.
SUSTAINABLE, SMART AND RESPONSIBLE NATURE PARK TOURISM

The one of the largest nature parks in Latvia is Nature Park “Piejūra”. It is a very complicated area due to its valuable and sensitive coastal habitats. On the one hand, it is a territory with rich biodiversity, and on the other hand it is an area actively used by visitors and tourists due to its location close to the capital of Latvia. Therefore, implementation of sustainable nature protection, conservation and management activities is particularly important. However, as the area is widely visited, there is public resistance to the implementation of management activities. The aim of the research is to identify the level of awareness and attitude of Nature Park visitors in respect of the nature conservation, protection and management activities. To achieve the aim of the research, quantitative research methods have been used. The data allows us to conclude that the understanding of the necessary nature management and protection activities has become deeper in the society. The public understands the established restrictions and considers that there is no necessity to strengthen the restrictions, but only to promote their observance. The study confirms that the attitude towards and understanding of the nature conservation activities changes in the society if there is enough information provided and the necessity for the activities is explained.
The roles of partial melting of metasomatised mantle, magma mixing at continental crust level and fractionation in calc-alkaline minette genesis, SE Spain

ABSTRACT Detailed textural and compositional study of calc-alkaline lamprophyres and minettes from Zeneta, SE Spain Neogene Volcanic Province (NVP) are used to unravel the magma sources and differentiation processes involved in their formation. The presence of xenocrysts of various origins indicates a hybrid nature involving mantle-derived alkaline lamproitic and continental crust-derived granitic parental magmas. A new U-Th-Pb zircon age of Zeneta minettes allows contextualizing their generation in time and space during regional lamproite magma intrusion and crustal anatexis in the NVP. Interaction and mixing of these compositionally contrasted magmas resulted in the formation of hybrid calc-alkaline lamprophyre minette. This process is reflected by the phases that crystallized from the hybrid magma, particularly phlogopite, and by the whole-rock composition of the less fractionated rocks. The calculated contribution of lamproitic and crustal-derived magma end-members in minette formation are 30–40% and 60–70%, respectively. Mixing of end-member magmas of contrasting rheological properties was possible only in a calculated thermal-window of 1025–1125°C, after cooling of intruding lamproitic magma and heating of host granitic anatectic region. The calculated thermal window fits with the estimated rheological properties of Zeneta minettes and the crystallization temperature of early minette-derived phlogopite. Furthermore, fractional crystallization was identified for the first time in the Zeneta minettes, based on the observed whole-rock line of descent from the less evolved mixed magmas through intermediate to felsic minettes and associated textural and compositional features of late crystallized phases. Polytope Vector Analysis allowed an integrated quantitative characterization of magma differentiation, including magma mixing and subsequent fractional crystallization. The identification of mixing and fractionation processes in calc-alkaline minettes genesis, which otherwise does not show spatial and temporal association in the field with granitic bodies, opens a new scenario to be considered in understanding the petrogenesis of these rocks.
Computational Strategies for the Architectural Design of Bending Active Structures

Active bending introduces a new level of integration into the design of architectural structures, and opens up new complexities for the architectural design process. In particular, the introduction of material variation reconfigures the design space. Through the precise specification of their stiffness, it is possible to control and pre-calibrate the bending behaviour of a composite element. This material capacity challenges architecture's existing methods for design, specification and prediction. In this paper, we demonstrate how architects might connect the designed nature of composites with the design of bending-active structures, through computational strategies. We report three built structures that develop architecturally oriented design methods for bending-active systems using composite materials. These projects demonstrate the application and limits of the introduction of advanced engineering simulation into an architectural workflow, and the extension of architecture's existing physics-based approaches.
Preparation and In‐Situ High‐Throughput Screening of Bi Thixotropic Ink

Preparing thin‐layer thermoelectric (TE) material libraries through inkjet printing (IJP) combined with selective laser melting (SLM) is a feasible solution to achieve high‐throughput screening (HTS) of high‐performance TE materials. The preparation of stable printable elementary inks with solid particle size in micron‐level is a prerequisite for the realization of the above technical objective. In this work, a series of thixotropic inks containing micron‐sized Bi powder, mixed organic solvent of ethanol/ethylene glycol (EG), and polyurea rheological additive of BYK‐420 are prepared. According to the proposed screening principles for printability and sedimentation stability, the best composition of the Bi thixotropic ink is determined with a solid content of 2–10 vol%, a relative EG content of 2–8 vol%, and a relative additive BYK‐420 content of 2.5 vol%. The effectiveness of the above mentioned HTS method is further proven through the printability Z value and the sedimentation rate of the selected inks. This work provides an effective way for in‐situ high‐throughput screening the printability and sedimentation stability of thixotropic inks, even though the solid density is high and the particle size is in micron‐level. It would lay a solid foundation for further high‐throughput screening of high‐performance TE materials.
Closing the gap: flexible and dynamic design education to better prepare digital media design students for professional practice

The dynamic and fast changing nature of digital media presents many challenges for design professionals as well as for design educators. Managing the increasing complexity of technology is one of them. Surprisingly, the digital media design industry's switch to multidisciplinary collaborative teamwork as a response to the increasing complexity of technology has been rarely anticipated by higher digital media design education perhaps because subject 'silos' make collaboration more difficult. Major research into the employability of graduates from design disciplines in the United Kingdom (UK) and Australia revealed that employers are concerned about the preparedness of undergraduate digital media design students when entering the profession. The research highlighted the lack of professional skills and soft skills such as verbal communication of ideas and teamwork. Clearly it is time to respond to the widening gap between professional practice and design education. Currently under development and testing at an Australian university is a new learning and teaching model, referred to as the POOL Model. This new model is a multidisciplinary system of interdependent collaboration and expertise exchange across university, industry and community sectors. The Pool Model is based on existing resources and implemented as an integral part of the curriculum at undergraduate level in order to prepare students for collaborative multidisciplinary practice and meaningful careers in industry. This paper describes the development and implementation of an alternative learning and teaching model. The rational for the development of the model is described and its evaluation through the application of accepted research principles and methodologies.
Lateglacial and Holocene sedimentary dynamics in northwestern Baffin Bay as recorded in sediment cores from Cape Norton Shaw Inlet (Nunavut, Canada)

The physical, sedimentological, mineralogical and elemental geochemical properties of sediment cores AMD1803‐02BC and 01PC from the Cape Norton Shaw Inlet were investigated to reconstruct glacial sediment discharges from southeastern Manson Icefield and document the impact of ice–ocean interactions on the sediment dynamics and opening of the North Water Polynya (NOW) in northwestern Baffin Bay since the last deglaciation. Laminated glaciomarine sediments rich in quartz and feldspar are observed prior to 11 cal. ka BP and were probably deposited by hyperpycnal currents triggered by the local retreat of the southern margin of the Innuitian Ice. Detrital proxies suggest that Early Holocene sediment dynamics were mainly influenced by sea ice and iceberg rafting and meltwater discharges related to the deglaciation of eastern Smith (~11 to 10.65 cal. ka BP) and Jones (~10.7 cal. ka BP) sounds. This also provides an upper limit to the timing of formation of the NOW. The high detrital carbonate contents during 8.8 to 6.6 cal. ka BP confirm that enhanced carbonate‐rich sediment export from Nares Strait to northern Baffin Bay occurred during and after the deglaciation of Kennedy Channel (8.8 to 8.2 cal. ka BP). Canadian Shield sediment inputs have dominated since 6.6 cal. ka BP, indicating that sedimentation is mainly influenced by Cape Norton Shaw glacier discharges. The lower level of sedimentation recorded in core 01PC during the Middle to Late Holocene suggests an accelerated landward retreat of the Cape Norton Shaw glaciers in response to warmer marine conditions. During the Neoglacial period, higher sedimentation rates and detrital proxies in the cores suggest increased glacial erosional processes, probably associated with the long‐term declines in boreal summer insolation and glacier growth. Finally, mineralogical and grain‐size data in core 02BC support the idea that increased Arctic atmospheric temperatures have had an important influence on the glacial dynamics during the industrial period.
Odor Control in Wastewater Treatment Plants

This manual should be of primary assistance to wastewater treatment plant (WWTP) operators and management, engineers, wastewater agency management personnel, laboratory staff, and collection systems maintenance supervisors in evaluating and solving odor problems in municipal WWTPs. The manual includes information on a variety of subjects concerning odor control for wastewater interceptor systems, treatment plants, and solids-processing facilities. It is an update to the Water Environment Federation’s 1979 Manual of Practice No. 22, \IOdor Control for Wastewater Facilities. \N The primary objectives of the manual are to: 1) provide sufficient information for the reader to understand the generation, evolution, and transport of odorants from wastewater systems; 2) delineate odorous compounds, define odor production and monitoring techniques, and provide guidance on performance testing of odor control processes and equipment; 3) describe and detail odor minimization and odor control processes; and 4) provide information on case histories of wastewater odor control programs.
20 GHz 5 dB gain analog multipliers with AlGaAs/GaAs HBTs

DC-to-above-20 GHz monolithic Gilbert Cell analog multipliers have been developed using AlGaAs/GaAs heterojunction bipolar transistor (HBT) technology. As a double balance active mixer, it exhibits very high conversion gain of above +5 dB with extremely high local oscillator-intermediate frequency (LO-IF) isolation of 33 dB for Rf/LO inputs up to 20 GHz. As a detection mixer in coherent optical heterodyne receivers, it can operate for RF/Lo inputs up to 15 GHz under a less than -7.5 dBm LO input condition. <<ETX>>
Art museums as institutions for human flourishing

ABSTRACT Visiting art museums is a common activity that a wide variety of people choose to engage in for many reasons. Increasingly, communities, nations, and societies are turning to art museums as institutions to enhance flourishing (i.e., reducing ill-being factors, such as depression, and increasing well-being factors, such as feelings of belonging). In this paper, we review the psychological literature examining art museum visitation and museum program participation and their associations with flourishing-related outcomes. The literature suggests art museum visitation is associated with reductions in ill-being outcomes and increases in well-being outcomes. Additionally, programs targeting flourishing outcomes in clinical or at-risk populations (e.g. people living with dementia, older adults) show benefits to participants, with visits to art museums being socially prescribed across the globe to address a variety of ill-being conditions. Implications for existing knowledge and avenues for future research are discussed.
Observations on non‐linear dynamic characteristics of suspension bridges

For most forms of loading static and dynamic response of a suspension bridge is modelled adequately by linear analysis. By examining the two principal non-linearities of inclined and vertical hanger suspension bridges the limitations of linear analyses are shown. The inclined hanger configuration is shown to be the more strongly non-linear. Some examples are given for simplified planar analyses of this type of bridge to large amplitude vehicular, random, sinusoidal and propagating earthquake excitation, showing that the effect only becomes significant when deflections approach the extent of cable sag due to cable elasticity.
Porous Alginate Scaffolds Designed by Calcium Carbonate Leaching Technique

One of the main challenges in modern tissue engineering is to design biocompatible scaffolds with finely tuned porous architecture and capacity to load bioactive molecules that guide the growth and differentiation of the cells during tissue reconstruction. This work proposes a strategy to design porous alginate scaffolds (PAS) with well‐tuned architecture by leaching of sacrificial vaterite CaCO3 microspheres packed in alginate. Pore size and interconnectivity depend on CaCO3 sphere dimensions and packing as well as alginate concentration. Varying of these parameters, almost hundred percent pore interconnectivity (or, by contrast, a zero pore interconnectivity) can be achieved. Junctions between interconnected pores are about 50–70% of the pore dimensions that provides molecular transport through the PASs potentially ensuring diffusion of nutrition, oxygen and metabolic products when cell seeding. An opportunity to fabricate a multifunctional scaffold is demonstrated by encapsulation of desired macromolecules into the individual pores of a scaffold (is illustrated by dextran loading). Mechanical properties of PASs are found typical for soft and hydrated structures (Young's modulus of 19 ± 15 kPa) which is appropriate for cell seeding. The three cell lines (HeLa, HEK293, and L929) are cultured on different alginate scaffolds to examine cell viability and adhesiveness.