In 2016. die Brazilian Agency of Electric Energy-launched a public call for research and development projects to reduce barriers to implementing energy efficiency projects and own electricity generation. One objective...
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Nowadays,the production of consumer goods is based on the use of non-renewable raw materials,which in recent years has been performing as a problem for the *** the large number of available biofibers in nature,their ...
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Nowadays,the production of consumer goods is based on the use of non-renewable raw materials,which in recent years has been performing as a problem for the *** the large number of available biofibers in nature,their use in the development of polymeric composites has inevitably emerged,it is also necessary to take into account the countless discarded plastics that still have the potential to be *** this work,fibers were extracted from pineapple crown residues and utilized to compose sustainable composites using recycled polypropylene from cups discarded in the trash as a ***,it is known that for good performance,it is necessary to achieve a good chemical interaction between the fiber and the *** order to improve this interaction,alkaline mercerization treatment was carried out on the surface of the fibers removing some components incompatible with the *** this work,the effect of the mercerization treatment on the properties of the fibers was studied,as well as their interaction with the *** effect of fiber concentration on the mechanical and thermal properties of composites was also *** of 5 and 7 wt%were used for both natural and mercerized fibers.A decrease in the number of degradation stages was observed through thermogravimetry analyses(from four in natural fiber to two in mercerized fibers),showing that the mercerization performed on the fibers was *** increase in the degree of crystallinity of mercerized fibers was also observed through the results of X-ray *** techniques indicate that amorphous compounds,such as hemicellulose and lignin,were partially *** the tensile test,it could be noted that all composites presented higher values of de elastic modulus than recycled polypropylene without added load;however,there were no differences in the elastic modulus between the different types of fibers and load ***,it is interesting to use fibers as r
Nanocrystalline alloys (nanoalloys) are prone to grain growth. It is known that grain boundary segregation and precipitation can stabilize nanoalloys, but the stabilization becomes less effective at high temperatures ...
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Experimental heavy-ion responses of two variants of SiC power MOSFETs are evaluated. The devices have similar epitaxial thickness but different doping. The higher doping in the epitaxial region results in lower breakd...
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Wearable biopotential sensing devices are essential to long-term and real-time monitoring of human ***-contact,capacitive sensing electrodes prevent potential skin iritations,and are thus beneficial for long-term *** ...
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Wearable biopotential sensing devices are essential to long-term and real-time monitoring of human ***-contact,capacitive sensing electrodes prevent potential skin iritations,and are thus beneficial for long-term *** capacitive electrodes are either connected to a separate control circuit via external wires or have limited sensing capacitances,which leads to low signal *** study demonstrates a stretchable capacitive sensing device with integrated electrodes and control electronics,with enhanced signal *** electrodes and the control electronics are fabricated on a common fabric substrate for breathability and strain-limiting *** stretchable electrodes are based on an island-bridge design with a stretchability as high as-100%,and an area ratio as high as-80%.By using a dielectric calcium copper titanate(CCTO)composite as the adhesive layer,the electrode capacitance can be increased,yielding an enhanced signal-to-noise ratio(SNR)in the acquired *** device offers a convenient and comfortable approach for long-term non-contact monitoring of biopotential signals.
Ultrafast optical control of ferroelectricity based on short and intense light can be utilized to achieve accurate manipulations of ferroelectric materials, which may pave a basis for future breakthrough in nonvolatil...
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This study presents the development of a 5.8 GHz high-power voltage doubling rectifier for wireless power transfer (WPT) applications, leveraging advanced gallium nitride (GaN) Schottky barrier diode (SBD). The GaN SB...
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ISBN:
(数字)9798331517434
ISBN:
(纸本)9798331517441
This study presents the development of a 5.8 GHz high-power voltage doubling rectifier for wireless power transfer (WPT) applications, leveraging advanced gallium nitride (GaN) Schottky barrier diode (SBD). The GaN SBD, designed for high-frequency and high-power operation, features a wide bandgap, high electron mobility, and high saturation velocity, ensuring superior performance in microwave power rectification. Key characteristics include a high breakdown voltage larger than 200 V, a low zero-bias junction capacitance of 0.34 pF, a turn-on voltage of 1.25 V, and an on-resistance of 10.5 Ω. These properties enable efficient rectification at the C band. The GaN SBD is integrated into an optimized rectifier circuit featuring a harmonic compression structure to enhance performance, a peak RF-to-DC conversion efficiency of 77.4% is achieved at an input power of 39 dBm. These results highlight the potential of high-power GaN SBDs in advancing high-frequency, high-power WPT systems.
Sodium all-solid-state batteries (NaSSBs) with an alloy-type anode (e.g., Sn and Sb) offer superior capacity and energy density compared to hard carbon anode. However, the irreversible loss of Na+ at the alloy anode d...
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We developed a terahertz time-domain spectroscopy system to generate high-resolution 2-dimensional images of paraffin-embedded murine pancreatic ductal adenocarcinoma tissues using the refractive index and absorption ...
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The local electronic structure of muons (Mu) as dilute pseudohydrogen in single-crystalline β−Ga2O3 has been studied by the muon spin rotation/relaxation (μSR). High-precision measurements over a long time range of ...
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The local electronic structure of muons (Mu) as dilute pseudohydrogen in single-crystalline β−Ga2O3 has been studied by the muon spin rotation/relaxation (μSR). High-precision measurements over a long time range of ∼25µs have clearly identified two distinct Mu states: a quasistatic Mu (Mu1) and fast-moving Mu (Mu2). By comparing this result with predictions from the recently established ambipolarity model, these two states are respectively attributed to the relaxed-excited states associated with the donor (E+/0) and acceptor (E−/0) levels predicted by density functional theory (DFT) calculations for the interstitial H. Furthermore, the local electronic structure of Mu1 is found to be an OMu-bonded state with three-coordinated oxygen. The structure is almost identical with the thermal equilibrium state of H, and it is found to function as an electron donor. The other Mu2 is considered to be in the hydride state (Mu−) from the ambipolarity model, suggesting that it is in fast diffusion motion through the short-lived neutral state due to the charge exchange reaction with conduction electrons (Mu−⇄Mu0+e−).
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