In this paper, we study the waveform design in wireless power transfer (WPT) system with multiple receivers. multi-receiver WPT system, due to severe attenuation of RF signals according distance and heterogeneity energy harvesting capability, there exists unfairness among receivers at different distances from transmitter and/or capabilities. Hence, alleviating is one critical challenges system. To tackle challenge a systematic way, consider fairness our applying α-proportional fairness. With...

Fe-20Mn-11.5Al-1.4C-5Cr (wt%) lightweight stainless steel (LWSS) was found to have equivalent or better resistance pitting corrosion than Fe-11Cr (SS). The desirable of the LWSS alloy attributed formation protective passive film. On LWSS, an (Al,Fe,Cr)-oxide formed, and on SS, a (Fe,Cr)-oxide formed. film had higher Cr+Al content that SS. In addition, compared be thick concentration point defects also low.

In this paper, we study a waveform scheduling problem for multi-receiver wireless power transfer (WPT) system considering time-varying channel conditions and minimum average output direct-current (DC) voltage requirement of each receiver. To end, formulate stochastic optimization that aims at maximizing the sum DC voltages receivers while satisfying requirements all receivers, by solving it, develop algorithm. algorithm, need to solve weighted-sum which is non-convex problem. cope with...

X-ray photoelectron spectroscopy (XPS) was used to measure the energy discontinuity in valence band (ΔEV) and conduction (ΔEC) of various dielectric/IGZO heterostructures. ΔEV values 0.48{plus minus}0.025 eV for HfO2/IGZO, 0.44{plus minus}0.21 Y2O3/IGZO, 0.81{plus minus}0.17 MgO/IGZO, 0.95{plus Al2O3/IGZO, 1.43{plus minus}0.15 SiO2/IGZO heterojunctions were obtained, respectively. The bandgap differences between these dielectrics IGZO would lead corresponding offset 2.39-4.74 eV. These...

We propose a receiver architecture and two modulation schemes for simultaneous wireless information power transfer (SWIPT), in which differently rectified signals are used decoding (ID) energy harvesting (EH). The first scheme is called amplitude difference shift keying (ADSK), gives low bit error rate (BER) by transferring through the between signals. second ratio (ARSK), offers considerable harvested demonstrate how they work provide their performance simulations.

The role of a highly crystalline and oriented lead titanate ( PTO ) seed layer on the subsequent phase texture evolution zirconate PZT thin films is investigated in situ using X‐ray diffraction XRD during crystallization. Crystalline layers were first prepared via 2‐methoxyethanol route. Amorphous with Zr/Ti ratio 52/48 was then deposited same synthesis route subsequently crystallized . During heating, tetragonal‐to‐cubic transformation occurs prior to formation perovskite Subsequent...

In this article, we study a joint antenna and Internet of Things device (ID) scheduling problem in the full-duplex (FD) multiple-input–multiple-output (MIMO) wireless-powered communication network (WPCN) over time-varying fading channels. We first formulate an optimization to maximize average sum rate IDs while satisfying their minimum data requirements by jointly ID selection for uplink transmission, switching, beamforming. To deal with problem, propose algorithm based on Lagrangian duality...

Phase pure Ba2FeMoO6 thin films were grown by pulsed laser deposition at substrate temperatures ranging from 600 to 900 °C, and the structural, magnetic, magnetotransport properties investigated. The grain size, conductivity, saturation magnetization, coercive field all increase with increasing growth temperature, while Curie temperature remains relatively constant. All samples showed negative magnetoresistance which is consistent half metallic property of double perovskites. Interestingly,...

Lead zirconium titanate (PZT) ceramic specimens were prepared by liquid phase sintering with excess PbO. By the addition of a small amount MgO, grain shape was changed from spherical to angular. When SiO 2 further added, twin induced in few grains, which grew abnormally during heat treatment. Through electron backscatter diffraction analysis and observation three‐dimensional morphology, grown large PZT grains determined be penetration twinned. Abnormal growth suggested because reentrant...

연구목적: 임플란트 시술을 받는 환자가 크게 증가하는 시점에 시술환자를 시술 전후로 추적 조사하여 전후의 저작능력을 평가하고, 환자 만족도와 삶의 질의 변화를 비교하기 위하여 연구를 수행하였다. 연구 재료 및 방법: 대구광역시와 울산광역시에 있는 6개의 치과 의원에서 2006년 12월부터 2007년 10월까지 받은 20세 이상의 성인 109명을 대상으로 전후에 설문조사를 실시하여 치료선택동기, 저작능력, 환자만족도, 권유의향, 질을 비교분석하였다. 결과: 선택 동기는 '치아기능의 회복을 위하여'가 45.9%로 가장 많았고, 치료 시 걱정되는 것은 '치료실패와 부작용'이 38.5%로 많았다. 시술에 대한 만족도는 전 30.37점에서 후 45.01점으로 만족도 점수가 유의한 차이가 있었으며(P 【Statement of problem: Recently the populations patients receiving implant surgery are greatly increase...

Epitaxial Ba2FeMoO6 thin films were grown via pulsed laser deposition under low oxygen pressure and their structural, chemical, magnetic properties examined, focusing on the effects of pressure. The chemical disorder, off-stoichiometry in B site cations (Fe Mo) increased with increasing thus degraded. Interestingly, contrast, negative magneto-resistance, which is characteristics this double perovskite material, was enhanced It believed that phase segregation highly disordered responsible for...

The valence band discontinuity (ΔE(v)) of Y2O3/InGaZnO4 (IGZO) heterojunctions was measured by a core-level photoemission method. Y2O3 exhibited gap -6.27 eV from absorption measurements. A value ΔE(v) = 0.44 ± 0.21 obtained using the Ga 2p3/2, Zn 2p3/2 and in 3d5/2 energy levels as references. Given experimental bandgap 3.2 for IGZO, this would indicate conduction offset ΔE(c) - 2.63 Y2O3/IGZO heterostructures nested interface alignment.

Superlattice (SL) structures of Ba2FeMoO6/Ba0.5Sr0.5TiO3 were grown via pulsed laser deposition on high quality ultra-smooth SrTiO3 substrates. N number ferroelectric Ba0.5Sr0.5TiO3 layers five ferromagnetic Ba2FeMoO6 and their structural, magnetic, transport, magneto-transport properties examined, focusing the effects superlattice periodicity layers. XRD analysis SLs proved layered structure. Magnetic study showed increment saturation magnetization decrease Curie temperature when compared...

The microstructure and hardness along the thickness direction of a water quenched, high-strength thick plate with 40 mm were investigated three specimens from plate: surface, 1/4t, 1/2t (center) thickness, phase transformation behavior according to cooling rate was analyzed through dilatometric experiments. Finally, for each estimated by comparing those specimens. Martensite observed on surface quenched due fast rate. On other hand, an inhomogeneous transformed inside relatively slow central...

The microstructure and hardness along the thickness direction of a water-quenched, high-strength thick plate with 40 mm were investigated three specimens from plate: surface, 1/4t, 1/2t (center) thickness, phase transformation behavior according to cooling rate was analyzed through dilatometric experiments. Finally, for each estimated by comparing those specimens. Martensite observed on surface water-quenched due fast rate. On other hand, an inhomogeneous transformed inside relatively slow...

High quality epitaxial Ba2FeMoO6 thin films and Ba2FeMoO6–(BaxSr1−x)TiO3 bi-layer (BL) superlattice (SL) structures were grown via pulsed laser deposition under low oxygen pressure, their structural, magnetic, magneto-transport properties examined. Superlattice confirmed by X-ray diffraction patterns. Low temperature magnetic measurement shows that the saturation magnetization (MS) is significantly higher for SLs almost similar or lower BLs, when compared to phase pure films. The variation...

To enhance the intrinsic yield strength of ferrite-pearlite microstructure that inevitably forms in a non-quenched-and-tempered steel for large structural components, this study analyzed effect adding Si. The resulting medium-carbon steels was examined, and increase interpreted based on strengthening mechanisms. Hot-rolled sheets 0.3C-1.5Mn were fabricated with Si ranging from 0.22 to 2.21 wt. %. Austenitization conducted at 880°C followed by slow continuous cooling, microstructures formed....