Miracle-dz/UniFAR-FTUs huggingface dataset:
Low Insertion-Loss MMIC Bandpass Filter Using Lumped-Distributed Parameters for 5G Millimeter-Wave Application

Millimeter-wave (mm-wave) monolithic-microwave-integrated-circuit (MMIC) bandpass filters (BPFs) usually feature high insertion loss (IL). To this concern, an analytical method for low-loss MMIC BPFs is presented by using lumped-distributed parameters in this article. To reduce the IL, the enhanced-quality-factor resonator and low-loss coupling topology are both investigated. First, the proposed resonator and filter are realized by combining quasi-lumped elements and distributed mutual coupling. Both compact size and multiple transmission zeroes are accordingly realized. Second, a low-loss coupling topology is further introduced for MMIC filter by using mixed electric and magnetic couplings. For theoretical analysis, the lossy equivalent circuit modeling for mm-wave MMIC BPF is investigated, as well as an analytical parameter extraction. Based on the circuit analysis, a fast synthesis of low-loss mm-wave MMIC filter is presented. For demonstration, two compact MMIC BPFs are designed by using the gallium arsenide (GaAs) process. Low IL of only 0.95 dB, sharp rejection skirt of passband, and wide stopband are simultaneously obtained. The features of the proposed MMIC BPFs indicate promising applications in the fifth-generation (5G) mm-wave systems.
Mathematical Modeling, Steady-State and Dynamic Behavior, and Control of Fuel Cells: A Review†

This paper presents a review of recent publications on mathematical modeling, steady-state and dynamic behavior, and control of polyelectrolyte membrane and solid oxide fuel cells. We limited the scope of this review to these two fuel cell types, which have been studied more, and have been reported to be more promising, than other fuel cell types. Zero-, one-, two-, and three-dimensional models developed to describe the behavior of the fuel cells are reviewed. Essential components of these models are highlighted. Conditions under which a fuel cell exhibits steady state multiplicity are described. Stability of the steady states is discussed. Processes that take place inside the fuel cells and contribute to the existence of multiple time-scales in the fuel cells are examined. Control configurations and strategies proposed and used for the fuel cells are reviewed, and advantages and disadvantages of each are listed. At the end, in view of the current status of the research activities, topics that require fur.
High-Squint SAR Imaging of Maritime Ship Targets

High-squint synthetic aperture radar (HS-SAR) imaging technology greatly enhances the flexibility of SAR. However, the existing HS-SAR imaging algorithms are generally based on the assumption that the illuminated target is static during the synthetic aperture formation. As a consequence, the state-of-the-art algorithms are unable to focus on moving targets well, thus leading to displaced and blurred images of the targets. A maritime ship is a typical kind of moving target with complex noncooperative motion, which has received much attention. Thus, it is a difficult but valuable issue to study HS-SAR imaging of ship targets. In this work, the influence of ship translation and fluctuation is theoretically analyzed. On the basis of these analyses, the new conception of “third range compression (TRC)” caused by ship translation is proposed, and the squint minimization (SM) operation is implemented for the compensation of TRC. Moreover, considering that the target Doppler parameters induced by ship fluctuation are related to its position, a novel method called WASH-CLEAN (watershed and CLEAN) is proposed to automatically focus ship scattering points with different swings. Finally, we propose an integrated modified range-Doppler (RD) imaging algorithm by combining the advantages of HS-SAR and inverse synthetic aperture radar (ISAR). The simulation results show the validity and effectiveness of the presented method.
Synthesis, spectroscopic characterization and DFT studies on the novel indeno-thiazolopyrimidine heterocyclic system

4-Phenyl-2-thioxo-3,4-dihydro-1H-indeno[1,2-d]pyrimidin-5(2H)-one 2, obtained by stirring a mixture of indane-1,3-dione, benzaldehyde and thiourea in acetic acid at room temperature for 12 h, on reaction with chloroacetic acid and 1,2-dibromoethane furnish compounds 3 (or 6) and 4 (or 7), respectively. The regiochemistry of the cyclized products and their structure is established by an elemental analysis, 1H NMR, 13C NMR, IR and mass spectral data. Density functional theory calculations have been carried out for compounds 3 and 4 and their isomers 6 and 7 with Jaguar version 6.5112 using the B3LYP density functional method and LACVP* basis set. 1H and 13C NMR of compounds 3, 4, 6 and 7 have been calculated. 2-Arylidene derivatives of 3 were obtained by two routes and their structure was established by spectral data. GRAPHICAL ABSTRACT
Enhanced amperometric acetone sensing using electrospun non-stoichiometric WO3−x nanofibers

We report on a highly sensitive amperometric gas sensing device that employs electrospun tungsten oxide (WO3−x) nanofibers thus enabling trace levels (concentrations 1.2–12.5 ppm) of acetone vapor to be detected when operating at 350 °C.
FRACTAL GEOMETRY OF THE RIVER NETWORK AND NEOTECTONICS OF THE SOUTHERN SIKHOTE-ALIN

A new complex parameter is proposed to characterize the self-similarity of a river network, that is, the parameter of river networks self-similarity (PRNS), which is a combination of the exponent in the distribution of channels along the lengths, fractal dimension of channels, and fractal dimension of points of channel order change, which is more correct when compared with neotectonic movements. A comprehensive analysis of the self-similarity of the river network model for the southern Sikhote-Alin derived from the Digital Elevation Model (DEM) based on the Shuttle Radar Topography Mission (SRTM) image was performed. Comparison of the results of morphostructural and fractal analyses showed a good correlation of these two methods. PRNS relative maxima coincide with areas where ascending neotectonic movements are of the largest amplitude (increment of relief), while minima coincide with areas either of the least increment of relief or where erosion rates are the greatest. At the same time, most epicenters of crustal earthquakes are confined to the boundary zones between PRNS relative maxima and minima, that is, uplifts are flanked by elongated seismic areas, which is related to the block nature of neotectonic vertical movements.
Volatile Constituents and Antibacterial Activity From Seeds of Bowdichia virgilioides Kunt

Abstract The essential oil from seeds of Bowdichia virgilioides Kunt (Fabaceae) growing in Brazil was obtained by hydrodistillation and analyzed by GC-FID and GC/MS. This analysis resulted in the identification of 17 components. The main constituents of the essential oil were b-elemene (6.9%), β-caryophyllene (44.1%), germacrene D (7.9%), bicyclogermacrene (6.4%) and caryophyllene oxide (8.9%). The oil was tested for its antimicrobial activity against seven bacteria using the standard gel diffusion method.
The role of residential suburbs in the knowledge economy: insights from a design charrette into nomadic and remote work practices

ABSTRACT New digital and remote work practices challenge city planning and urban design as they move economic activities from city centres to residential suburbs. Little is known about the spatial impact of these new work patterns on suburbia. This paper addresses this knowledge gap through a design charrette conducted in the City of Gold Coast, Australia. Despite often working individually, remote workers favour design interventions that facilitate a transformation of suburbia towards multi-use. Urban design strategies supporting new work practices in residential neighbourhoods can enable better collaboration and innovation, create new opportunities for third spaces, and unlock a city’s competitive advantage.
Crystal Field The ory and Optical Absorption of Cobalt and Nickel Boracites

In the boracite structure the local symmetry of paramagnetic ions is characterized by a strong tetragonal distortion of the cubic component of the crystal field caused by spatial and charge non-equivalency of nearest neighbours of 3d-ions and also by the lack of an inversion centre. The crystal field operator for ferroelectric and paraelectric phases has been calculated using the point charge model. The expressions connecting crystal field parameters and ion displacements have been derived. The optical absorption of boracites Me3B7O13X where Me = Co, Ni and X = Cl, Br, I has been studied in the spectral range 0.25 to 25 μm from 77 to 700 °K. The absorption spectra are much more complicated than the known spectra of Co2+ and Ni2+ in octahedral cubic crystal field. It was found that the intensity of many transitions in boracites drops when the temperature is raised. The most rapid decrease was observed in the vicinity of the ferroelectric Curie temperature Tc. Such unusual behaviour was assigned to the change of the crystal field odd component connected with unequivalent displacements of halogen ions relatively to the 3d-paramagnetic ion. The temperature dependence of the tetragonal crystal field parameters Ds and Dt was studied in cobalt boracites. An increase of Ds and decrease of the Dt was observed at Tc in accordance with the theoretical predictions. [Russian text Ignored].
Common Precursor Mechanism for the Heterogeneous Reaction of D2O, HCl, HBr, and HOBr with Water Ice in the Range 170−230 K: Mass Accommodation Coefficients on Ice

A chemical kinetic model is presented which fits the uptake kinetics of both steady-state and time-resolved heterogeneous reactions of D 2 O, HCl, HBr, and HOBr with ice substrates that have been studied in a Knudsen flow reactor. The salient feature of the model is the existence of two precursors to adsorption that explain the observed negative temperature dependence, as well as the absence of saturation, of the rate of uptake at the experimental conditions met in the Knudsen flow-reactor studies. From the temperature dependence of the fitted rate constants, enthalpy diagrams have been obtained in which the loosely bound precursor state has a binding energy on ice of 7.6-8.0, 6.4, 3.9, and 6.9 kcal/mol for D 2 O, HCl, HBr, and HOBr, respectively. The mass accommodation coefficients a at 200 K were 0.43 (D 2 O, B = bulk ice), 0.34 (D 2 O, C = condensed ice), 0.67 (HOBr, B-type ice), 0.36 (HCl, B-type ice), and 0.38 (HBr, B-type ice) and show a negative temperature dependence as well. The chemical kinetic model describes the transition between submonolayer Langmuir adsorption at low to multilayer adsorption at high doses or partial pressures.
Study on new chiral liquid crystalline monomers and polymers containing menthyl groups

A series of new chiral monomers (M1–M4) and the corresponding siloxane polymers (P1–P4) containing menthyl groups were synthesised to establish the relationship between their structure and liquid crystalline properties. The effect of the mesogenic core rigidity and the spacer length on the phase behaviour of the monomers and polymers obtained in this study was discussed. The selective reflection of light for the chiral monomers was studied with UV-Vis spectrometer. Polarising optical microscopy, differential scanning calorimetry, X-ray diffraction and thermogravimetric analysis were used to characterise the phase behaviour and thermal stabilities. It was found that these chiral monomers and polymers were beneficial for the formation of the mesophases when a flexible spacer was inserted between the mesogenic core and terminal menthyl groups. M1–M3 showed enantiotropic chiral smectic C phase and cholesteric phase, and monotropic cubic blue phase on cooling cycle. M4 only showed cholesteric phase. P1–P4 showed a smectic A phase. With increasing the mesogenic core rigidity or decreasing the spacer length, the corresponding melting temperatures, glass transition temperatures and isotropic temperatures all increased.
Photopolymerizable Elastomers for Vascular Tissue Regeneration

The aim of this study was to design new resin formulations for blood vessel substitutes with small inner diameter that can be 3 D-printed by Additive Manufacturing (AM). Commercially available urethane oligomer acrylates as cross-linking agents (CAs) with different reactive diluents (RDs) and/or thiol chain transfer agents (CTAs) were examined. It could be shown that the properties of photopolymers of carefully selected CA/RD/CTA combinations can be varied in a wide range, also to fit with those of natural blood vessels. Moreover, these materials showed good biocompatibility in in-vitro cell culture tests with endothelial cells. A new method to assess the tear resistance of the new materials in comparison with natural blood vessels was designed and established. The tear resistance of the developed photopolymers already approaches those of natural material, although there is still need of improvement. The 3 D-structuring of optimized resin system succeeded. Hence AM has proven to be an ideal tool to manufacture parts with the complex structure of natural blood vessels.
Simulation of Drying on the Basis of Nonequilibrium Thermodynamics of Heterogeneous Multiphase Polydispersed Systems

ABSTRACT The theoretical foundation of drying processes on the basis of last major achievements in the nanequilibrium thermodynamics of heterogeneous multiphase polydirpcrscd systems is developed. The system of integro-differential thermahydrodynamicd equations has been formulated far description of multiphase polydispersed syslems with heat and mass transfer. Ar a result. the new general structures of themodynmic driving forcer have been obtained for drying phenomena of various physical-chemml nature: heat. mechanical. diffusion. electrical. etc.
Year-round offshore distribution, behaviour, and overlap with commercial fisheries of a Critically Endangered small petrel

Without insights into the threats affecting species across their distributions and throughout their annual cycles, effective conservation management cannot be applied. The Whenua Hou diving petrel Pelecanoides whenuahouensis (WHDP) is a Critically Endangered small seabird whose offshore habits and threats are poorly understood. We tracked WHDPs year-round in 2015/16, 2017/18, and 2018/19 using global location-sensing immersion loggers to identify offshore distribution, movements, behaviour, and overlap with commercial fishing effort. During the breeding period, WHDPs ranged from southern Aotearoa (New Zealand) to Maukahuka (Auckland Islands). After breeding, WHDPs migrated southwest towards the Polar Front south of Australia, exhibited clockwise movements, and returned to their breeding grounds via the Subantarctic Front. During the non-breeding period, WHDPs exhibited extreme aquatic behaviour and spent >95% of their time on, or under, water. The core areas used consistently during breeding and non-breeding periods warrant listing as Important Bird and Biodiversity Areas. Spatiotemporal overlap of commercial fishing effort with breeding distributions was considerable (35%), in contrast with non-breeding distributions (0%). Spatial restrictions of anthropogenic activity around the breeding colony during the breeding period could help protect WHDPs, but such measures should be subjected to a structured decision-making framework. Our results illustrate the importance of year-round studies to inform conservation of marine species.
Effects of oral administration of Garcinia dulcis flower extract on arterial blood pressure and renal excretory functions in rats

Intravenous infusion of either camboginol or morelloflavone from Garcinia dulcis (GD) exerted diuretic, hypotensive, and vasorelaxant effects in either normotensive or hypertensive rats. This study aims to investigate the effects of GD flower extract on arterial blood pressure (ABP) and renal excretory functions. Male Wistar rats (8-weekold) were divided into 4 groups (group I–IV, n= 6 each) in both acute and sub-chronic protocols. The GD extract was orally administrated to group II–IV at the dose of 50, 100, or 200 mg/kg, respectively, while group I served as vehicle control. The oral administration was performed before the experiment in acute protocol and daily for 2 weeks in the sub-chronic protocol. The ABP and renal excretory functions were measured in the anesthetized rats. The levels of fasting blood glucose (FBG), plasma lipid profiles, and liver enzymes were evaluated in the sub-chronic experiment along with liver histology. The results showed that acute administration of GD extract significantly decreased ABP but increased renal blood flow, glomerular filtration rate, urine flow rate, osmolar clearance, and negative free water clearance when compared with the control. In the sub-chronic protocol, the GD extract significantly decreased ABP but did not alter the renal excretory functions. The plasma levels of FBG, lipid profiles, liver enzymes, and the histology of liver were not changed. It is concluded that acute oral administration of GD extract possessed hypotensive and diuretic effects whereas the sub-chronic treatment of GD showed hypotensive effect and no alterations in liver function, FBG, and plasma lipid profiles.
Cooperative Content Replacement and Recommendation in Small Cell Networks

Content caching has limitations on achieving cache gains (e.g., cache hit ratio) in small cell networks, due to limited storages of small base stations (SBSs) and inherent user demand patterns (i.e., initial content preferences). Two effective approaches have been proposed to exploit the potential of content caching: SBS cooperation to utilize cache storage, and proactive content recommendation to shape user demand. In this paper, we investigate cooperative content caching and recommendation to maximize cache gains, while guaranteeing users’ satisfaction by recommending appealing content items. We propose a generic framework for cooperative content caching and recommendation, based on which we propose an online and distributed scheme by designing a continuous-time Markov chain (CTMC). In particular, online content caching (a.k.a., content replacement) is implemented by hopping from one cache state to another in the CTMC, while content recommendation is performed heuristically through sequential fixing at each cache state. Besides, we characterize the performance gap between our proposed scheme and the theoretical optimum in terms of cache hit ratio. Simulation results demonstrate that the proposed scheme achieves better cache hit ratios than other schemes in single-BS scenarios, and provides a competitive solution in multiple-BS scenarios.
High Hole Mobility and Low Leakage Thin-Body (In)GaSb p-MOSFETs Grown on High-Bandgap AlGaSb

In this study, we demonstrated low leakage current and high mobility thin body (In)GaSb p-FETs. Through the optimization of the V/III ratio during the epitaxial growth, we achieved a highly insulating bottom Al<sub>0.95</sub>Ga<sub>0.0</sub><sub>5</sub>Sb barrier, which eliminates the junction leakage. We also suppressed the interface trap-assisted surface leakage current by introducing In<sub>0.53</sub>Ga<sub>0.47</sub>As surface passivation on the GaSb channel. Furthermore, GaSb/InGaSb/GaSb quantum well (QW) channel structure provided significant improvement in effective mobility (<inline-formula> <tex-math notation="LaTeX">${\mu }_{\mathrm{ eff}}$ </tex-math></inline-formula>) characteristics. As a result, the fabricated devices showed the lowest off-leakage current (<inline-formula> <tex-math notation="LaTeX">${I} _{\mathrm{ off}}$ </tex-math></inline-formula>), subthreshold slope (<inline-formula> <tex-math notation="LaTeX">${S}$ </tex-math></inline-formula>.<inline-formula> <tex-math notation="LaTeX">${S}$ </tex-math></inline-formula>.) and high <inline-formula> <tex-math notation="LaTeX">$\mu _{\mathrm{ eff}}$ </tex-math></inline-formula> among reported GaSb p-MOSFETs.
Experimental demonstration of hot-carrier photo-current in an InGaAs quantum well solar cell

An unambiguous observation of hot-carrier photocurrent from an InGaAs single quantum well solar cell is reported. Simultaneous photo-current and photoluminescence measurements were performed for incident power density 0.04–3 kW cm−2, lattice temperature 10 K, and forward bias 1.2 V. An order of magnitude photocurrent increase was observed for non-equilibrium hot-carrier temperatures >35 K. This photocurrent activation temperature is consistent with that of equilibrium carriers in a lattice at elevated temperature. The observed hot-carrier photo-current is extracted from the well over an energy selective GaAs barrier, thus integrating two essential components of a hot-carrier solar cell: a hot-carrier absorber and an energy selective contact.
Isolation and Structure-Activity Relationship of the Antioxidant Chemical Constituents from the Flowers of Rosa chinensis Jacq

The objective of this study was to investigate the antioxidant activity, chemical constituents, and structure-activity relationship from the flowers of Rosa chinensis Jacq. The antioxidant activity of the different polar solvent extracts were assayed by a 1,1-diphenyl-2-picrylhydrazyl scavenging experiment. The extract with the strongest 1,1-diphenyl-2-picrylhydrazyl scavenging capacity was further isolated and purified by column chromatography. The structures of the isolated compounds were elucidated on the basis of spectral analysis and physiochemical properties. The antioxidant activity of these compounds was assayed by a 1,1-diphenyl-2-picrylhydrazyl scavenging experiment and ascorbic acid was chosen as the positive control. The ethyl acetate fraction had the strongest 1,1-diphenyl-2-picrylhydrazyl scavenging activity. Ten compounds were obtained, represented as: 3,4,8,9,10-pentahydroxydibenzo[b,d]pyran-6-one (1), quercetin (2), kaempferol (3), 3,5,7,4′-tetrahydroxy-8-methoxy-flavone (4), isoquercetrin (5), kampferol 3-O-β-D-glucoside (6), tiliroside (7), kampferol 3-O-(6′′-galloyl)-β-D-glucoside (8), kampferol 3-O-(2′′,6′′-digalloyl)-β-D-glucoside (9), quercetin 3-O-(2′′,6′′-digalloyl)-β-D-glucoside (10). The 1,1-diphenyl-2-picrylhydrazyl scavenging capacity for these compounds, in descending order, were as follows: 10 > 9 > 1 ≈ 8 > 5 > ascorbic acid ≈ 2 > 6 > 7 > 3 > 4. Compounds 1, 8, 9, and 10 have the stronger antioxidant activity. Our results suggested the antioxidant activities of these compounds might be influenced by the number and position of hydroxyl groups in their aromatic rings.