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8,600 | On-a-chip biosensing based on all-dielectric nanoresonators | physics.app-ph | Nanophotonics has become a key enabling technology in biomedicine with great
promises in early diagnosis and less invasive therapies. In this context, the
unique capability of plasmonic noble metal nanoparticles to concentrate light
on the nanometer scale has widely contributed to biosensing and enhanced
spectroscopy. ... | physics |
8,601 | A THz Slot Antenna Optimization Using Analytical Techniques | physics.app-ph | Slot antennas are very popular microwave antennas and slotted wave guides are
used for high frequency radar systems. A thin slot in an infinite ground plane
is the complement to a dipole in free space. This was described by H.G. Booker
[2] who extended Babinet's principle from optics to show that the slot will
have the... | physics |
8,602 | Can Distribution Grids Significantly Contribute to Transmission Grids' Voltage Management? | physics.app-ph | Power generation in Germany is currently transitioning from a system based on
large, central, thermal power plants to one that heavily relies on small,
decentral, mostly renewable power generators. This development poses the
question how transmission grids' reactive power demand for voltage management,
covered by centr... | physics |
8,603 | Self-supporting structure design in additive manufacturing through explicit topology optimization | physics.app-ph | One of the challenging issues in additive manufacturing (AM) oriented
topology optimization is how to design structures that are self-supportive in a
manufacture process without introducing additional supporting materials. In the
present contribution, it is intended to resolve this problem under an explicit
topology op... | physics |
8,604 | Nuclear Data and Fuel/Assembly Manufacturing Uncertainties Analysis and Preliminary Validation of SUACL | physics.app-ph | As the sensitivity and uncertainty analysis of nuclear system can provide
more confident bounds for the Best-estimate Prediction used to assess the
performance and safety of nuclear plant, the uncertainty and sensitivity
analysis has been a component of analysis of nuclear system. Both the cross
section uncertainty and... | physics |
8,605 | Pinhole induced efficiency variation in perovskite solar cells | physics.app-ph | Process induced efficiency variation is a major concern for all thin film
solar cells, including the emerging perovskite based solar cells. In this
manuscript, we address the effect of pinholes or process induced surface
coverage aspects on the efficiency of such solar cells through detailed
numerical simulations. Inte... | physics |
8,606 | Giant electrostrain of 0.57% in a periodically orthogonal poled lead titanate zirconate ceramic via reversible domain switching | physics.app-ph | The widely used ferroelectric ceramics based actuators always suffer from
small output strains (typically ~0.1-0.15%). Non-180{\deg} domain switching can
generate large strain in ferroelectrics but it is usually irreversible. In this
work, we tailored the domain structures in a soft lead titanate zirconate (PZT)
cerami... | physics |
8,607 | Tunable, synchronized frequency down-conversion in magnetic lattices with defects | physics.app-ph | We study frequency conversion in nonlinear mechanical lattices, focusing on a
chain of magnets as a model system. We show that by inserting mass defects at
suitable locations, we can introduce localized vibrational modes that
nonlinearly couple to extended lattice modes. The nonlinear interaction
introduces an energy t... | physics |
8,608 | The Response of Conductive-Fiber Reinforced Composites to Electric Field | physics.app-ph | An analytical procedure, which couples electric, magnetic, thermal and
mechanical effects is presented for the prediction of the response of
unidirectional fiber-reinforced composites that are subjected to electric
field, applied in the fibers' direction. It is assumed that at least one of the
phases of the composite (... | physics |
8,609 | The Effects of Superheating Treatment on Distribution of Eutectic Silicon Particles in A357-Continuous Stainless Steel Composite | physics.app-ph | In the present study, superheating treatment has been applied on A357
reinforced with 0.5 wt. % (Composite 1) and 1.0 wt.% (Composite 2) continuous
stainless steel composite. In Composite 1 the microstructure displayed poor
bonding between matrix and reinforcement interface. Poor bonding associated
with large voids als... | physics |
8,610 | Dynamic balancing of super-critical rotating structures using slow-speed data via parametric excitation | physics.app-ph | High-speed machinery is often designed to pass several $"$critical$"$ speeds,
where vibration levels can be very high. To reduce vibrations, rotors usually
undergo a mass balancing process, where the machine is rotated at its full
speed range, during which the dynamic response near critical speeds can be
measured. High... | physics |
8,611 | Vertical Bifacial Solar Farms: Physics, Design, and Global Optimization | physics.app-ph | There have been sustained interest in bifacial solar cell technology since
1980s, with prospects of 30-50% increase in the output power from a stand-alone
single panel. Moreover, a vertical bifacial panel reduces dust accumulation and
provides two output peaks during the day, with the second peak aligned to the
peak el... | physics |
8,612 | Low-frequency wide band-gap elastic/acoustic meta-materials using the K-damping concept | physics.app-ph | The terms "acoustic/elastic meta-materials" describe a class of periodic
structures with unit cells exhibiting local resonance. This localized resonant
structure has been shown to result in negative effective stiffness and/or mass
at frequency ranges close to these local resonances. As a result, these
structures presen... | physics |
8,613 | Tunable Extremely Asymmetric Acoustic Metasurfaces Made by Coupled Membrane Resonators | physics.app-ph | We report the experimental demonstration of tunable asymmetric acoustic
metasurfaces with extreme contrast, made by two decorated membrane resonators
(DMRs) coupled via a sealed air column. The front side of the metasurface is
impedance matched to air and perfectly absorbing, while the backside is hard
and totally refl... | physics |
8,614 | Comment on 'Table-like magnetocaloric effect and enhanced refrigerant capacity in Eu8Ga16Ge30-EuO composite materials' [Appl. Phys. Lett. 99, 162513 (2011)] | physics.app-ph | This is a comment on 'Table-like magnetocaloric effect and enhanced
refrigerant capacity in Eu8Ga16Ge30-EuO composite materials', published few
years ago. Refrigerant Capacity (RC) and Relative Cooling Power (RCP) are
properties that characterize the magnetocaloric effect. RCP and mainly RC are
also important to charac... | physics |
8,615 | High speed optical processing via four-wave-mixing in a silicon waveguide | physics.app-ph | We demonstrate all-optical demultiplexing at 160 Gigabits per second in the
C-band, based on nonlinear optics using four-wave mixing (FWM) in a silicon
nanowire. We achieve error-free operation with a penalty of ~ 3.9dB. | physics |
8,616 | Simultaneous summation and recognition effects for a dual-emitter light-induced neuromorphic device | physics.app-ph | We propose and fabricate a dual-emitter light-induced neuromorphic device
composed of two light-induced devices with a common collector and base. Two
InGaN multiple quantum well diodes (MQW-diodes) are used as the emitters to
generate light, and one InGaN MQW-diode is used as the common collector to
absorb the emitted ... | physics |
8,617 | Spoof Surface Plasmon Polariton Leaky-Wave Antennas using Periodically Loaded Patches above PEC and AMC Ground Planes | physics.app-ph | This paper proposes two spoof surface plasmon polariton (SSPP) leaky-wave
antennas using periodically loaded patches above perfect electric conductor
(PEC) and artificial magnetic conductor (AMC) ground planes, respectively. The
SSPP leaky-wave antenna is based on a SSPP transmission line, along which
circular patches ... | physics |
8,618 | A study of size-dependent properties of MoS2 monolayer nanoflakes using density-functional theory | physics.app-ph | Novel physical phenomena emerge in ultra-small sized nanomaterials. We study
the limiting small-size-dependent properties of MoS$_{2}$ monolayer rhombic
nanoflakes using density-functional theory on structures of size up to
Mo$_{35}$S$_{70}$ (1.74~nm). We investigate the structural and electronic
properties as function... | physics |
8,619 | A Two-element Parasitic Antenna Approaching the Minimum Q-factor at a Given Directivity | physics.app-ph | In this paper we investigate a super-directive antenna based on a parasitic
structure with a circumscribing sphere of diameter 69 mm corresponding to
0.2$\lambda$@880 MHz. The antenna is modeled, simulated, measured, and it is
also evaluated against the new Q-factor bound for small antennas at a given
total directivity... | physics |
8,620 | Titanium dioxide hole-blocking layer in ultra-thin-film crystalline silicon solar cells | physics.app-ph | One of the remaining obstacles to approaching the theoretical efficiency
limit of crystalline silicon (c-Si) solar cells is the exceedingly high
interface recombination loss for minority carriers at the Ohmic contacts. In
ultra-thin-film c-Si solar cells, this contact recombination loss is far more
severe than for trad... | physics |
8,621 | Extended social force model with a dynamic navigation field for bidirectional pedestrian flow | physics.app-ph | An extended social force model with a dynamic navigation field is proposed to
study bidirectional pedestrian movement. The dynamic navigation field is
introduced to describe the desired direction of pedestrian motion resulting
from the decision-making processes of pedestrians. The macroscopic fundamental
diagrams obtai... | physics |
8,622 | Nanodiamond arrays on glass for quantification and fluorescence characterisation | physics.app-ph | Quantifying the variation in emission properties of fluorescent nanodiamonds
is important for developing their wide-ranging applicability. Directed
self-assembly techniques show promise for positioning nanodiamonds precisely
enabling such quantification. Here we show an approach for depositing
nanodiamonds in pre-deter... | physics |
8,623 | Differential ghost imaging in time domain | physics.app-ph | Differential ghost imaging was attempted in time domain, i.e., temporal
differential ghost imaging (TDGI), using pseudo-randomized light pulses and a
temporal object consisting of no-return-to-zero bit patterns of varying duty.
Evaluation of the signal-to-noise characteristics by taking account of errors
due to false c... | physics |
8,624 | Resistive switching in MoSe$_{2}$/BaTiO$_{3}$ hybrid structures | physics.app-ph | Here we study the resistive switching (RS) effect that emerges when
ferroelectric BaTiO$_{3}$ (BTO) and few-layers MoSe$_{2}$ are combined in one
single structure. The C-V loops reveal the ferroelectric nature of both
Al/Si/SiO$_{x}$/BTO/Au and Al/Si/SiO$_{x}$/MoSe$_{2}$/BTO/Au structures and the
high quality of the Si... | physics |
8,625 | Resonance control of graphene drum resonator in nonlinear regime by standing wave of light | physics.app-ph | We demonstrate the control of resonance characteristics of a drum type
graphene mechanical resonator in nonlinear oscillation regime by the
photothermal effect, which is induced by a standing wave of light between a
graphene and a substrate. Unlike the conventional Duffing type nonlinearity,
the resonance characteristi... | physics |
8,626 | Implementation of the KDamper concept using disc springs | physics.app-ph | The KDamper is a novel passive vibration isolation and damping concept, based
essentially on the optimal combination of appropriate stiffness elements, which
include a negative stiffness el-ement. Among others, KDamper can provide
comparative advantages in the very low fre-quency range. It should be
mentioned, that the... | physics |
8,627 | A charging method for electric vehicle using multi battery series mode | physics.app-ph | A charging method for electric vehicle using multi battery series mode which
consisted of the following steps was introduced: the battery series is firstly
charged at a constant power with a charging current of I1. When the terminal
voltage over the battery series has reached the 1st threshold voltage, the
charging cur... | physics |
8,628 | Band Gap Formation and Tunability in Stretchable Serpentine Interconnects | physics.app-ph | Serpentine interconnects are highly stretchable and frequently used in
flexible electronic systems. In this work, we show that the undulating geometry
of the serpentine interconnects will generate phononic band gaps to manipulate
elastic wave propagation. The interesting effect of `bands-sticking-together'
is observed.... | physics |
8,629 | Impact of Junction Depth and Abruptness on the Activation and the Leakage Current in Germanium n$^{+}$/p Junctions | physics.app-ph | The phosphorous activation in Ge n$^{+}$/p junctions is compared in terms of
junction depth, by using laser spike annealing at 860{\deg}C for 400$\mu$s. The
reverse junction leakage is found to strongly depend on the abruptness of
dopant profiles. A shallow and abrupt junction is shown to have lower
phosphorous activat... | physics |
8,630 | Variation of field enhancement factor near the emitter tip | physics.app-ph | The field enhancement factor at the emitter tip and its variation in a close
neighbourhood determines the emitter current in a Fowler-Nordheim like
formulation. For an axially symmetric emitter with a smooth tip, it is shown
that the variation can be accounted by a $\cos{\tilde{\theta}}$ factor in
appropriately defined... | physics |
8,631 | A Highly Efficient Polarization-Independent Metamaterial-Based RF Energy-Harvesting Rectenna for Low-Power Applications | physics.app-ph | A highly-efficient multi-resonant RF energy-harvesting rectenna based on a
metamaterial perfect absorber featuring closely-spaced polarization-independent
absorption modes is presented. Its effective area is larger than its physical
area, and so efficiencies of 230% and 130% are measured at power densities of
10 uW/cm2... | physics |
8,632 | A Metamaterial-inspired Approach to RF Energy Harvesting | physics.app-ph | We demonstrate an RF energy harvesting rectenna design based on a
metamaterial perfect absorber (MPA). With the embedded Schottky diodes, the
rectenna converts captured RF waves to DC power. The Fabry-Perot (FP) cavity
resonance of the MPA greatly improves the amount of energy captured.
Furthermore, the FP resonance ex... | physics |
8,633 | Tunable Optical Bistability and Optical Switching by Nonlinear Metamaterials | physics.app-ph | We demonstrate a nonlinear metamaterial in microwave frequency regime with
hysteresis effect and bistable states, which can be utilized as a remotely
controllable micro second switching device. A varactor loaded split-ring
resonator (SRR) design which exhibits power and frequency dependent broadband
tunability of the r... | physics |
8,634 | Enhanced Second-harmonic Generation Using Nonlinear Metamaterials | physics.app-ph | We demonstrate a nonlinear metamaterial which enhance higher order harmonics
in microwave frequency regime. Nonlinearity in the structure is introduced by
adding a varactor diode in the common slit of the double split ring resonator
(DSRR) design. By engineering the structure such that inner ring resonance
frequency of... | physics |
8,635 | Simultaneous readout of two adjacent bit tracks with a spin-torque oscillator | physics.app-ph | We propose a novel setup for a spin-torque oscillator reader in magnetic hard
disk drive technology. Two adjacent bit tracks are to be read simultaneously,
leading to high data transfer rate and increased resilience to noise as the
lateral size of the oscillator device is allowed to remain larger than the bit
width. We... | physics |
8,636 | High-Intensity Discharge Lamp and Duffing Oscillator - Similarities and Differences | physics.app-ph | The processes inside the arc tube of high-intensity discharge lamps are
investigated by finite element simulations. The behavior of the gas mixture
inside the arc tube is governed by differential equations describing mass,
energy and charge conservation as well as the Helmholtz equation for the
acoustic pressure and th... | physics |
8,637 | Organic solar cell design as a function of radiative quantum efficiency | physics.app-ph | We study the radiative decay, or fluorescence, of excitons in organic solar
cells as a function of its geometrical parameters. Contrary to their
non-radiative counterpart, fluorescence losses strongly depend on the
environment. By properly tuning the thicknesses of the buffer layers between
the active regions of the ce... | physics |
8,638 | Optimizing coating performance for diffusion under cyclic moisture exposure | physics.app-ph | Fickian diffusion is often used to model moisture transport through barrier
coatings, where the goal is to protect an underlying substrate from the onset
of corrosion caused by buildup of water or other aggressive species. Such
coatings are often exposed to cyclic moisture, either in laboratory testing or
in service du... | physics |
8,639 | Dipole-field-assisted charge extraction in metal-perovskite-metal back-contact solar cells | physics.app-ph | Hybrid organic-inorganic halide perovskites are low-cost solution-processable
solar cell materials with photovoltaic properties that rival those of
crystalline silicon. The perovskite films are typically sandwiched between thin
layers of hole and electron transport materials, which efficiently extract
photogenerated ch... | physics |
8,640 | On-Site Wireless Power Generation | physics.app-ph | Conventional wireless power transfer systems consist of a microwave power
generator and a microwave power receiver separated by some distance. To realize
efficient power transfer, the system is typically brought to resonance, and the
coupled-antenna mode is optimized to reduce radiation into the surrounding
space. In t... | physics |
8,641 | Atomic-scale Structural and Chemical Characterization of Hexagonal Boron Nitride Layers Synthesized at the Wafer-Scale with Monolayer Thickness Control | physics.app-ph | Hexagonal boron nitride (h-BN) is a promising two-dimensional insulator with
a large band gap and low density of charged impurities that is isostructural
and isoelectronic with graphene. Here we report the chemical and atomic-scale
structure of CVD-grown wafer-scale (~25 cm2) h-BN sheets ranging in thickness
from 1-20 ... | physics |
8,642 | Compact bilateral single conductor surface wave transmission line | physics.app-ph | A compact bilateral single conductor surface wave transmission line (TL) is
proposed, converting the quasi-transverse electromagnetic (QTEM) mode of low
characteristic impedance slotline into the transverse magnetic (TM) mode of
single-conductor TL. The propagation constant of the proposed TL is decided by
geometric pa... | physics |
8,643 | InGaN Metal-IN Solar Cell: optimized efficiency and fabrication tolerance | physics.app-ph | Choosing the Indium Gallium Nitride (InGaN) ternary alloy for thin films
solar cells might yield high benefits concerning efficiency and reliability,
because its bandgap can be tuned through the Indium composition and radiations
have little destructive effect on it. It may also reveal challenges because
good quality p-... | physics |
8,644 | Mini Review on the Significance Nano-Lubricants in Boundary Lubrication Regime | physics.app-ph | This article briefly reviews the significance nano-lubricants and assesses
their effectiveness to provide the most promising approaches to reduce the
friction and anti-wear/scuffing over the boundary regime. The main purpose of
this review is to summarize the present knowledge about major advantages of the
nanomaterial... | physics |
8,645 | Numerical analysis of flexible ultra-thin conformal antenna array | physics.app-ph | We present a flexible ultra-thin conformal patch antenna array operating in
the Industrial, Scientific, and Medical (ISM) band (2.4-2.4835 GHz) for
wireless sensor nodes. The antenna was designed on a flexible polyimide film
(Kapton HN) substrate with the size of 95180.1 mm3 and the number of 7
radiating elements. The ... | physics |
8,646 | Large-aperture computational single-sensor microwave imager using 1-bit programmable coding metasurface at single frequency | physics.app-ph | The microwave imaging based on inverse scattering strategy holds important
promising in the science, engineering, and military applications. Here we
present a compressed-sensing (CS) inspired large- aperture computational
single-sensor imager using 1-bit programmable coding metasurface for efficient
microwave imaging, ... | physics |
8,647 | Factors Determining the Carrier Distribution in InGaN/GaN Multiple-Quantum-Well Light-Emitting Diodes | physics.app-ph | Factors determining the carrier distribution in InGaN/GaN
multiple-quantum-well (MQW) light-emitting diodes (LEDs) are studied via
photoluminescence and temperature-dependent electroluminescence spectra.
Employing a dichromatic LED device, we demonstrate that the carrier
recombination rate should be considered playing ... | physics |
8,648 | Experimental demonstration of an ultra-compact on-chip polarization controlling structure | physics.app-ph | We demonstrated a novel on-chip polarization controlling structure,
fabricated by standard 0.18-um foundry technology. It achieved polarization
rotation with a size of 0.726 um * 5.27 um and can be easily extended into
dynamic polarization controllers. | physics |
8,649 | Enhancement of superconductivity in NbN nanowires by negative electron-beam lithography with positive resist | physics.app-ph | We performed comparative experimental investigation of superconducting NbN
nanowires which were prepared by means of positive-and negative electron-beam
lithography with the same positive tone Poly-methyl-methacrylate (PMMA) resist.
We show that nanowires with a thickness 4.9 nm and widths less than 100 nm
demonstrate ... | physics |
8,650 | Erasing and Correction of Liquid Metal Printed Electronics Made of Gallium Alloy Ink from the Substrate | physics.app-ph | Gallium-based liquid metals have recently been found important in a variety
of newly emerging applications such as room temperature metal 3D printing,
direct writing of electronics and biomedicine etc. In all these practices, one
frequently encounters the situations that a printed circuit or track needs to
be corrected... | physics |
8,651 | The Vapor-Solid-Solid Growth of Ge Nanowires on Ge (110) by Molecular Beam Epitaxy | physics.app-ph | We demonstrate Au-assisted vapor-solid-solid (VSS) growth of Ge nanowires
(NWs) by molecular beam epitaxy (MBE) at 220 {\deg}C, which is compatible with
the temperature window for Si-based integrated circuit. Low temperature grown
Ge NWs hold a smaller size, similar uniformity and better fit with Au tips in
diameter, i... | physics |
8,652 | A hybrid solution for simultaneous transfer of ultrastable optical frequency, RF frequency and UTC time-tags over optical fiber | physics.app-ph | We describe a fiber-optic solution for simultaneous distribution of all
signals generated at todays most advanced time and frequency laboratories, i.e.
an ultrastable optical reference frequency derived from an optical atomic
clock, a radio frequency precisely linked to a realization of the SI-Second,
and a realization... | physics |
8,653 | Time-Series Analysis of Photovoltaic Distributed Generation Impacts on a Local Distributed Network | physics.app-ph | Increasing penetration level of photovoltaic (PV) distributed generation (DG)
into distribution networks will have many impacts on nominal circuit operating
conditions including voltage quality and reverse power flow issues. In U.S.
most studies on PVDG impacts on distribution networks are performed for west
coast and ... | physics |
8,654 | Perfect Anomalous Reflection with an Aggressively Discretized Huygens' Metasurface | physics.app-ph | This paper investigates the discretization of a periodic metasurface and
demonstrates how such a surface can achieve perfect anomalous reflection.
Whilst most contemporary theoretical works on metasurfaces deal with continuous
current or impedance distributions, we examine how discretization affects a
metasurface, and ... | physics |
8,655 | Optimized Solar Photovoltaic Generation in a Real Local Distribution Network | physics.app-ph | Remarkable penetration of renewable energy in electric networks, despite its
valuable opportunities, such as power loss reduction and loadability
improvements, has raised concerns for system operators. Such huge penetration
can lead to a violation of the grid requirements, such as voltage and current
limits and reverse... | physics |
8,656 | Investigation and modeling of photocurrent collection process in multiple quantum well solar cells | physics.app-ph | Solar cells employing quantum wells can enhance the light absorption but
suffer from the difficulty in photogenerated carrier extraction. Here, we
analyzed the spectral response and the photocarrier collection mechanism of
p-i-n multiple quantum well (MQW) solar cells using the effective-mobility
model. Both the simula... | physics |
8,657 | Studies on thermal degradation behavior of nano silica loaded cotton and polyester fabrics | physics.app-ph | In this work cotton and polyester fabric were coated with silica nano
particles using pad-dry-cure method. The prepared composite fabrics were
analyzed in terms of change in their thermal degradation properties. The
oxidative degradation characteristic of control and treated samples were
studied using Thermo Gravimetri... | physics |
8,658 | Ultra-high and Tunable Sensitivity Leaky-Wave Scanning Using Gain-Loss C-section Phasers | physics.app-ph | A periodic leaky-wave antenna (LWA) with tuning capability and enhanced
scanning sensitivity is introduced in this paper. This antenna leverages the
concept of active Gain-Loss C-section pairs to tune the group delay of each
antenna unit cell without affecting its magnitude response. This in turn
changes the scanning a... | physics |
8,659 | Acoustic frequency filter based on anisotropic topological phononic crystals | physics.app-ph | There are growing efforts in constructing topological edge states in
classical wave system. However, most of the work study the existence, creation
and properties of the edge states, and the demonstration of application is
highly desirable. Here, we present our design of a two-dimensional anisotropic
phononic crystal t... | physics |
8,660 | Scanning Microwave Microscopy of Aluminum CMOS Interconnect Lines Buried in Oxide and Water | physics.app-ph | Using a scanning microwave microscope, we imaged in water aluminum
interconnect lines buried in aluminum and silicon oxides fabricated through a
state-of-the-art 0.13 um SiGe BiCMOS process. The results were compared with
that obtained by using atomic force microscopy both in air and water. It was
found the images in w... | physics |
8,661 | Low-Profile Spoof Surface Plasmon Polaritons Traveling-Wave Antenna for Endfire Radiation | physics.app-ph | This paper proposes a low-profile and highly efficient endfire radiating
travelling-wave antenna based on spoof surface plasmon polaritons (SSPPs)
transmission line. The aperture is approximately
$0.32\lambda_0\times0.01\lambda_0$ where $\lambda_0$ is the space wavelength at
the operational frequency 8 GHz. This antenn... | physics |
8,662 | Amplitude Stochastic Response of Rayleigh Beams to Randomly Moving Loads | physics.app-ph | We consider the problem of the nonlinear response of a Rayleigh beam to the
passage of a train of forces moving with stochastic velocity. The Fourier
transform and the theory of residues is used to estimate the mean-square
amplitude of the beam, while the stochastic averaging method gives the
stationary probability den... | physics |
8,663 | The pH-dependent electrical potential and elastic modulus of a nanoscale DNA film and the resultant bending signal for a microcantilever biosensor | physics.app-ph | This paper devotes to formulating several multiscale models to study the
effect of pH-dependent ionic inhomogeneity on the electrical potential
distributions and the graded elastic properties of a nanoscale DNA film and the
related bending deflections of a microcantilever biosensor. First, the Langmuir
isotherm was use... | physics |
8,664 | Ultrafast imprinting of topologically protected magnetic textures via pulsed electrons | physics.app-ph | Short electron pulses are demonstrated to trigger and control magnetic
excitations, even at low electron current densities.
We show that the tangential magnetic field surrounding a picosecond electron
pulse can imprint topologically protected magnetic textures such as skyrmions
in a sample with a residual Dzyaloshins... | physics |
8,665 | Inverse designed broadband all-dielectric electromagnetic metadevices | physics.app-ph | We present an all-dielectric metadevice platform realized by combining an
inverse electromagnetic design computational method with additive
manufacturing. As opposed to conventional flat metasurface based devices that
are composed of resonant building blocks resulting in narrow band operation,
our design approach creat... | physics |
8,666 | Helical and skyrmion lattice phases in three-dimensional chiral magnets: Effect of anisotropic interactions | physics.app-ph | In this work, we study the magnetic orders of the classical spin model with
the anisotropic exchange and Dzyaloshinskii-Moriya interactions in order to
understand the uniaxial stress effect in chiral magnets such as MnSi.
Variational zero temperature (T) calculated results demonstrate that various
helical orders can be... | physics |
8,667 | Grid-Connected Photovoltaic System for Active and Reactive Power Management | physics.app-ph | In this paper, the behavior of a photovoltaic (PV) system, with maximum power
point tracking (MPPT) connected to three-phased grid has been investigated. A
voltage source inverter (VSI) has been used to connect the photovoltaic system
to the grid. The control strategy applied to control inverter switches is based
on vo... | physics |
8,668 | Wave steering effects in anisotropic composite structures: Direct calculation of the energy skew angle through a finite element scheme | physics.app-ph | A systematic expression quantifying the wave energy skewing phenomenon as a
function of the mechanical characteristics of a non-isotropic structure is
derived in this study. A structure of arbitrary anisotropy, layering and
geometric complexity is modelled through Finite Elements (FEs) coupled to a
periodic structure w... | physics |
8,669 | Studying Cascading Overload Failures under High Penetration of Wind Generation | physics.app-ph | While power systems are reliable infrastructures, their complex
interconnectivities allow for propagation of disturbances through cascading
failures which causes blackouts. Meanwhile the ever increasing penetration
level of renewable generation into power grids introduces a massive amount of
uncertainty to the grid tha... | physics |
8,670 | A Silicon Photonic Integrated Frequency-Tunable Microwave Photonic Bandpass Filter | physics.app-ph | We report a fully integrated microwave photonic passband filter on a silicon
photonic chip. The on-chip integrated microwave photonic filter (IMPF) consists
of a high-speed phase modulator (PM), a thermally tunable high-Q micro-disk
resonator (MDR), and a high-speed photodetector (PD). The bandpass filtering
function o... | physics |
8,671 | Inverse Design of Conjugated Polymers from Computed Electronic Structure Properties: Model Chemistries of Polythiophenes | physics.app-ph | Using a diverse set of 100 oligothiophenes, extrapolated oligomer and polymer
HOMO, LUMO and HOMO-LUMO gaps are shown to be accurately estimated from the
computed values of the trimer HOMO, trimer LUMO and trimer HOMO-LUMO gaps.
These simple approximations can be improved further through easy to calculate
properties of... | physics |
8,672 | Acoustic emission source localization in thin metallic plates: a single-sensor approach based on multimodal edge reflections | physics.app-ph | This paper presents a new acoustic emission (AE) source localization for
isotropic plates with reflecting boundaries. This approach that has no blind
spot leverages multimodal edge reflections to identify AE sources with only a
single sensor. The implementation of the proposed approach involves three main
steps. First,... | physics |
8,673 | Spatial filtering of audible sound with acoustic landscapes | physics.app-ph | Acoustic metasurfaces manipulate waves with specially designed structures and
achieve properties that natural materials cannot offer. Similar surfaces work
in audio frequency range as well and lead to marvelous acoustic phenomena that
can be perceived by human ears. Being intrigued by the famous Maoshan Bugle
phenomeno... | physics |
8,674 | Tuning of bound states in the continuum by waveguide rotation | physics.app-ph | We consider acoustic wave transmission in non axisymmetric waveguide which
consists of cylindrical resonator and two semi-infinite cylindrical waveguides
whose axes are shifted relative to the resonator axis and each other by
azimuthal angle $\Delta\phi$. We show that for rotation of one of attached
waveguides the coup... | physics |
8,675 | Valley Vortex States in Sonic Crystals | physics.app-ph | Valleytronics is quickly emerging as an exciting field in fundamental and
applied research. In this Letter, we study the acoustic version of valley
states in sonic crystals and reveal a vortex nature of such states. Besides the
selection rules established for exciting valley polarized states, a mimicked
spin Hall effec... | physics |
8,676 | Strong 4-mode coupling of nanomechanical string resonators | physics.app-ph | We investigate mechanical mode coupling between the four fundamental flexural
modes of two doubly-clamped, high-Q silicon-nitride nanomechanical string
resonators. Strong mechanical coupling between the strings is induced by the
strain mediated via a shared clamping point, engineered to increase the
exchange of oscilla... | physics |
8,677 | Hydrogen loss and its improved retention in hydrogen plasma treated a-SiNx:H films: ERDA study with 100 MeV Ag7+ ions | physics.app-ph | Hydrogen loss from a-SiNx:H films under irradiation with 100 MeV Ag7+ ions
using elastic recoil detection analysis (ERDA) experiments is reported. The
results are explained under the basic assumptions of the molecular
recombination model. The ERDA hydrogen counts are composed of two distinct
hydrogen desorption process... | physics |
8,678 | Twist Coupled Kirigami Cellular Metamaterials and Mechanisms | physics.app-ph | Manipulation of thin sheets by folding and cutting offers opportunity to
engineer structures with novel mechanical properties, and to prescribe complex
force-displacement relationships via material elasticity in combination with
the trajectory imposed by the fold topology. We study the mechanics of cellular
Kirigami th... | physics |
8,679 | In-operando quantitation of Li concentration for commercial Li-ion rechargeable battery using high-energy X-ray Compton scattering | physics.app-ph | Compton scattering is one of the promising probe to quantitate of the Li
under in-operando condition, since high-energy X-rays which have high
penetration power into the materials are used as incident beam and Compton
scattered energy spectrum have specific line-shape by the elements. We develop
in-operando quantitatio... | physics |
8,680 | Thermodynamic limit of solar to fuel conversion for generalized photovoltaic-electrochemical system | physics.app-ph | Variability of the energy output throughout the day/night poses a major
hurdle to the widespread adoption of photovoltaic systems. An integrated
photovoltaic (PV) and electrochemical (EC)-storage system offers a solution,
but the thermodynamic efficiency ({\eta}_sys) of the integrated system and the
optimum configurati... | physics |
8,681 | UVC LEDs on Bulk AlN Substrates Using Silicon Nanomembranes for Efficient Hole Injection | physics.app-ph | As UV LEDs are explored at shorter wavelengths (< 280 nm) into the UVC
spectral range, the crystalline quality of epitaxial AlGaN films with high Al
compositions and inefficient hole injection from p-type AlGaN severely limit
the LED performance and development. In this work, we report on 237 nm light
emission with a r... | physics |
8,682 | Frequency shift keying by current modulation in a MTJ-based STNO with high data rate | physics.app-ph | Spin torque nano-oscillators are nanoscopic microwave frequency generators
which excel due to their large frequency tuning range and agility for amplitude
and frequency modulation. Due to their compactness, they are regarded as
suitable candidates for applications in wireless communications, where
cost-effective and CM... | physics |
8,683 | 3D printable multimaterial cellular auxetics with tunable stiffness | physics.app-ph | Auxetic materials are a novel class of mechanical metamaterials which exhibit
an interesting property of negative Poisson ratio by virtue of their
architecture rather than composition. It has been well established that a wide
range of negative Poisson ratio can be obtained by varying the geometry and
architecture of th... | physics |
8,684 | Toward Microphononic Circuits on Chip: An Evaluation of Components based on High-Contrast Evanescent Confinement of Acoustic Waves | physics.app-ph | We investigate the prospects for micron-scale acoustic wave components and
circuits on chip in solid planar structures that do not require suspension. We
leverage evanescent guiding of acoustic waves by high slowness contrast
materials readily available in silicon complementary metal-oxide semiconductor
(CMOS) processe... | physics |
8,685 | Elastic Wave Eigenmode Solver for Acoustic Waveguides | physics.app-ph | A numerical solver for the elastic wave eigenmodes in acoustic waveguides of
inhomogeneous cross-section is presented. Operating under the assumptions of
linear, isotropic materials, it utilizes a finite-difference method on a
staggered grid to solve for the acoustic eigenmodes of the vector-field elastic
wave equation... | physics |
8,686 | Velocity-map imaging for emittance characterization of multiphoton-emitted electrons from a gold surface | physics.app-ph | A velocity-map-imaging spectrometer is demonstrated to characterize the
normalized transverse emittance of photoemitted electron bunches. The
two-dimensional (2D) projected velocity distribution images of photoemitted
electrons are recorded by the detection system and analyzed to obtain the
normalized transverse emitta... | physics |
8,687 | Mechanical Rainbow Trapping and Bloch Oscillations in Structured Elastic Beams | physics.app-ph | We demonstrate, both experimentally and numerically, the mechanical rainbow
trapping effect and the mechanical Bloch oscillations for torsional waves
propagating in chirped mechanical beams. After extensive simulations, three
quasi-one-dimensional chirped structures were designed, constructed and
experimentally charact... | physics |
8,688 | Effect of plasma formation on the double pulse laser excitation of cubic silicon carbide | physics.app-ph | We calculate the electron excitation in cubic silicon carbide (3C-SiC) caused
by the intense femtosecond laser double pulses using time-dependent density
functional theory (TDDFT). We assume the electron distributions in the valence
band (VB) and the conduction band (CB) based on three different approaches to
determine... | physics |
8,689 | Subwavelength sound screening by coupling space-coiled Fabry-Perot resonators | physics.app-ph | We explore broadband and omnidirectional low frequency sound screening based
on locally resonant acoustic metamaterials. We show that the coupling of
different resonant modes supported by Fabry-Perot cavities can efficiently
generate asymmetric lineshapes in the transmission spectrum, leading to a
broadband sound opaci... | physics |
8,690 | THz-Frequency Spin-Hall Auto-Oscillator Based on a Canted Antiferromagnet | physics.app-ph | We propose a design of a THz-frequency signal generator based on a layered
structure consisting of a current-driven platinum (Pt) layer and a layer of an
antiferromagnet (AFM) with easy-plane anisotropy, where the magnetization
vectors of the AFM sublattices are canted inside the easy plane by the
Dzyaloshinskii-Moriya... | physics |
8,691 | Effect of compressibility and aspect ratio on performance of long elastic seals | physics.app-ph | Recent experiments show no statistical impact of seal length on the
performance of long elastomeric seals in relatively smooth test fixtures.
Motivated by these results, we analytically and computationally investigate the
combined effects of seal length and compressibility on the maximum differential
pressure a seal ca... | physics |
8,692 | Alias-Free Basis for Modal Sensorless Adaptive Optics Using the Second Moment of Intensity | physics.app-ph | In theory of optical aberrations, an aberrated wavefront is represented by
its coefficients in some orthogonal basis, for instance by Zernike polynomials.
However, many wavefront measurement techniques implicitly approximate the
gradient of the wavefront by the gradients of the basis functions. For a finite
number of a... | physics |
8,693 | Development of Single-Shot Multi-Frame Imaging of Cylindrical Shock Waves in a Multi-Layered Assembly | physics.app-ph | We demonstrate single-shot multi-frame imaging of quasi-2D cylindrically
converging shock waves as they propagate through a multi-layer target sample
assembly. We visualize the shock with sequences of up to 16 images, using a
Fabry-Perot cavity to generate a pulse train that can be used in various
imaging configuration... | physics |
8,694 | Heterogeneous Memristive Devices Enabled by Magnetic Tunnel Junction Nanopillars Surrounded by Resistive Silicon Switches | physics.app-ph | Emerging non-volatile memories (NVMs) have currently attracted great interest
for their potential applications in advanced low-power information storage and
processing technologies. Conventional NVMs, such as magnetic random access
memory (MRAM) and resistive random access memory (RRAM) suffer from limitations
of low t... | physics |
8,695 | Strongly exchange-coupled and surface-state-modulated magnetization dynamics in Bi2Se3/YIG heterostructures | physics.app-ph | We report strong interfacial exchange coupling in Bi2Se3/yttrium iron garnet
(YIG) bilayers manifested as large in-plane interfacial magnetic anisotropy
(IMA) and enhancement of damping probed by ferromagnetic resonance (FMR). The
IMA and spin mixing conductance reached a maximum when Bi2Se3 was around 6
quintuple-laye... | physics |
8,696 | Review on Modeling of Mechanical and Thermal Properties of Nano- and Micro-Composites | physics.app-ph | This article deals with the prediction of thermomechanical properties of
fiber reinforced composites using several micromechanics models. These include
strength of material approach, Halpin-Tsai equations, multi-phase mechanics of
materials approaches, multi-phase Mori-Tanaka models, composite cylindrical
assemblage mo... | physics |
8,697 | Dynamic Sensitivity Study of MEMS Capacitive Acceleration Transducer Based on Analytical Squeeze Film Damping and Mechanical Thermoelasticity Approaches | physics.app-ph | The dynamic behavior of a capacitive micro-electro-mechanical (MEMS)
accelerometer is evaluated by using a theoretical approach which makes use of a
squeeze film damping (SFD) model and ideal gas approach. The study investigates
the performance of the device as a function of the temperature, from 228 K to
398 K, and pr... | physics |
8,698 | Synthesis of Negative Group Delay Using Lossy Coupling Matrix | physics.app-ph | In this paper, a systematic synthesis approach is proposed for achieving
negative group delay responses using lossy coupling matrix. It is
mathematically proved that, for a passive and reciprocal network, loss is the
necessary condition to realize a negative group delay. Also, the optimum
strategy is to place zeros and... | physics |
8,699 | Enormous sample scale-up from nanoliter to microliter in high field liquid state dynamic nuclear polarization | physics.app-ph | Dynamic nuclear polarization (DNP) enhances nuclear magnetic resonance (NMR)
signals by transferring electron spin polarization to nuclei. As DNP requires
microwave magnetic fields B1 strong enough to saturate electron spins,
microwave resonators are generally used to achieve a sufficient B1, at the
expense of restrict... | physics |
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