bluuebunny/crossref_metadata_2025_split huggingface dataset:
Recent advances on semiconducting nanomaterials–ferroelectric liquid crystals nanocomposites
Authors: Kumar Ajay , Priyam  , Meena Harikesh , Prakash Jai , Wang Ling , Singh Gautam 
Published: September 2021

Abstract
Ferroelectric liquid crystals (FLCs) possess excellent electro-optical properties compared to nematic liquid crystals (LCs) including lower threshold voltage, faster switching response, good optical contrast and bi-stable switching, memory effect, etc. Due to such characteristic features, FLCs are more promising for next generation high performance photonic applications. Moreover, the synergy of FLCs with nanoscience has clearly shown the enormous possibilities to improve their electro-optical properties. Over the past two decades, several investigations of nanomaterials (NMs) (metal, metal oxide, ferroelectric, insulating, graphene, semiconducting etc) dispersed FLC nanocomposites have been carried out. Semiconducting nanomaterials (SNMs), exhibiting quantum confinement effect, have been one of the most explored NMs as dopants in FLCs leading to better molecular alignment, enhanced dielectric behaviour, pronounced memory effect, power efficient, faster switching response and enhanced photoluminescence. Here, we present a focussed review on SNMs–FLCs nanocomposites and propose future work to advance LC nanoscience.
Anomalous enhancement of atomic vibration induced by electronic transition in 2H-MoTe2 under compression
Authors: Hao Xingyu , Guo Zhiying , Li Haijing , Gong Yu , Chen Dongliang 
Published: September 2021

Abstract
In this work, we explore the atomic vibration and local structure in 2H–MoTe2 by using high-pressure x-ray absorption fine structure spectroscopy up to ∼20 GPa. The discrepancy between the Mo–Te and Mo–Mo bond length in 2H–MoTe2 obtained from extended-XAFS and other techniques shows abnormal increase at 7.3 and 14.8 GPa, which is mainly due to the abrupt enhancement of vibration perpendicular to the bond direction. Ab initio calculations are performed to study the electronic structure of 2H–MoTe2 up to 20 GPa and confirm a semiconductor to semimetal transition around 8 GPa and a Lifshitz transition around 14 GPa. We attribute the anomalous enhancement of vibration perpendicular to the bond direction to electronic transitions. We find the electronic transition induced enhancement of local vibration for the first time. Our finding offers a novel insight into the local atomic vibration and provides a new platform for understanding the relationship between the electronic transition and atomic vibration.
Effect of the plasma self-radiation on the growth of thermal filamentation instabilities in imploding Z pinches
Authors: Oreshkin V I , Oreshkin E V 
Published: September 2021

Abstract
The development of thermal filamentation (TF) instabilities in a current-carrying plasma shell under the action of the plasma self-radiation was analyzed in terms of a small perturbation theory. A stationary collisional radiative model was used to calculate the parameters of the bremsstrahlung, recombination radiation, and spectral line radiation. It has been shown that radiative losses can either enhance or weaken the growth of TF instabilities. The pattern of the effect is governed by the dependence of the energy lost by the plasma due to radiation, Q
Rad, on the plasma temperature T. If Q
Rad increases slower than ∼T, the radiative losses enhance TF instabilities. In the opposite case, that is when Q
Rad increases faster than ∼T, the radiative losses lead to suppression of TF instabilities. When the energy lost due to radiation is greater than the Joule energy input, TF instabilities can be completely stabilized due to radiation. The plasma parameter ranges for which stabilization of TF instabilities may occur due to radiation have been found for aluminum and argon.
Self-consistent simulation of resistive kink instabilities with runaway electrons
Authors: Liu Chang , Zhao Chen , Jardin Stephen C , Ferraro Nathaniel M , Paz-Soldan Carlos , Liu Yueqiang , Lyons Brendan C 
Published: September 2021

Abstract
A new fluid model for runaway electron (RE) simulation based on fluid description is introduced and implemented in the magnetohydrodynamics (MHD) code M3D-C1, which includes self-consistent interactions between plasma and REs. The model utilizes the method of characteristics to solve the continuity equation for the RE density with large convection speed, and uses a modified Boris algorithm for pseudo particle pushing. The model was employed to simulate MHD instabilities happening in a RE final loss event in the DIII-D tokamak. Nonlinear simulation reveals that a large fraction of REs get lost to the wall when kink instabilities are excited and form stochastic field lines in the outer region of the plasma. Plasma current converts from RE current to Ohmic current. Given the agreements with experiment on RE loss ratio and mode growing time, the simulation model provides a reliable tool to study macroscopic plasma instabilities in existence of RE current, and can be used to support future studies of RE mitigation strategies in ITER.
Afterglow dynamics of plasma potential in bipolar HiPIMS discharges
Authors: Avino F , Manke F , Richard T , Sublet A 
Published: September 2021

Abstract
In bipolar magnetron sputtering, the plasma afterglow is initiated by switching the target bias from a negative to positive voltage. In the following, the plasma potential evolution in this configuration is characterized, being responsible for the ion acceleration at the substrate sheath potential fall, in particular in high power impulse magnetron sputtering (HiPIMS). A mass-energy analyzer and a Langmuir probe respectively measure the ion energies and the plasma/floating potential at different positions within HiPIMS discharges. A plasma potential drop and rise in the first 45 μs of the afterglow is observed, settling in the plasma bulk towards values below the applied positive bias. The measured ion energies agree with the plasma potential values before and after the drop-rise. To gain more comprehensive insights into the mechanisms responsible for such a potential evolution, particle-in-cell Monte Carlo 3D simulations of bipolar direct current magnetron sputtering discharges are explored in equivalent geometries. Despite their average power being orders of magnitude lower compared to the HiPIMS configuration, a similar afterglow behavior is observed. This indicates that the measured dynamics are not specific to HiPIMS, but rather a feature of bipolar magnetron sputtering. The responsible mechanisms are studied further: the effects of various system parameters are decoupled, with the magnetic field configuration emerging as crucial for the plasma potential drop-rise dynamics and the associated re-ionization close to the target.
Synchronization in cilia carpets: multiple metachronal waves are stable, but one wave dominates
Authors: Solovev Anton , Friedrich Benjamin M 
Published: September 2021

Abstract
Carpets of actively bending cilia represent arrays of biological oscillators that can exhibit self-organized metachronal synchronization in the form of traveling waves of cilia phase. This metachronal coordination supposedly enhances fluid transport by cilia carpets. Using a multi-scale model calibrated by an experimental cilia beat pattern, we predict multi-stability of wave modes. Yet, a single mode, corresponding to a dexioplectic wave, has predominant basin-of-attraction. Similar to a ‘dynamic’ Mermin–Wagner theorem, relaxation times diverge with system size, which rules out global order in infinite systems. In finite systems, we characterize a synchronization transition as function of quenched frequency disorder, using generalized Kuramoto order parameters. Our framework termed Lagrangian mechanics of active systems allows to predict the direction and stability of metachronal synchronization for given beat patterns.
Frequency chirping of neoclassical tearing modes by energetic ions
Authors: Cai Huishan 
Published: September 2021

Abstract
The mechanism of rapid frequency chirping for neoclassical tearing modes (NTMs) is studied. Resonance between NTMs and trapped energetic ions can provide an additional torque to change the evolution of frequency. Whether the frequency rises or falls depends on the direction of island propagation. If the island propagates in the direction of ion diamagnetic drift, the frequency will be increased dramatically and rapidly. If the island propagates in the direction of electron diamagnetic drift, the frequency will be reduced to a lower value. The predicted chirping time is consistent with experimental results in DIII-D (Liu et al 2020 Nucl. Fusion
60 112009).
Design of Mechanical Fixture Based on Computer CAD Research
Authors: Cui Chengmei , Han ZhiYin , Yu TingTing 
Published: September 2021

Abstract
CAD as a computer technology under the progress of the auxiliary drawing products, for the mechanical fixture design has brought convenience. CAD greatly improve the efficiency of design, and more beautiful and accurate, according to the design of the finished product has a higher quality of course. This paper will discuss the mechanical fixture design based on CAD.
Research on the Function of Intelligent Service Platform of Library Based on Computer
Authors: Nan Chunjuan 
Published: September 2021

Abstract
The development of library is gradual, and every major change is accompanied by the innovation and progress of science and technology. With the formal proposal of the concept of Internet of Things and its rapid spread to the whole world, in the library field, following the composite library and digital library, the intelligent library based on information technology, which is marked by digitalization, networking and intelligence is coming into people's vision. So, this paper will lead you to explore the functions of intelligent library service platform based on computer.
Research on the Application of Multiple LDPC Code Serial Decoding Algorithm in Optical Fiber Communication
Authors: Yang Bo 
Published: September 2021

Abstract
Optical fiber communication technology is an important part of the information society, in the process of information transmission has a rapid, accurate, reliable and not limited by distance advantages. In this paper, the principle of optical fiber communication system and the basic concept of LDPC code are explained, and the application of multiple LDPC code serial decoding algorithm in optical fiber communication is studied, for readers' reference.
Analysis of Seismic Performance of Nuclear Power Manipulator Based on ANSYS
Authors: Zhang Shanshan , Du Wenman , Li Qian , Gao Yongqiang , Hu Guohui , Sun Guoliang 
Published: September 2021

Abstract
Nuclear power manipulator is mainly used in the work of radiation or other human cannot come to the site to operate the environment, the seismic performance has received great attention. In this paper, the modal test of manipulator prototype is carried out by hammering method, combined with ANSYS software, the dynamic response of manipulator model was obtained by response spectrum analysis. The accuracy of the simulation model was calibrated by comparing the experimental and simulation results, to provide a reference for the seismic structure design of nuclear power manipulator in the future.
Research on Hardware Circuit design and Positioning Algorithm of Electronic Whiteboard Based on Ultrasonic Infrared
Authors: Zhao Haohui 
Published: September 2021

Abstract
With the development and progress of science and technology, in daily work,we have introduced various computer technology-related algorithms, which makes our work more precise and efficient.This paper mainly studies the hardware circuit design and positioning of the electronic whiteboard using ultrasonic infrared, and it also discusses the system structure and principles.
Research on Design, Detection and Realization of Monitoring System Based on Ship Power Grid Parameter
Authors: Yang Shuangqi 
Published: September 2021

Abstract
The power system of the ship is closely related to the it’s shipping, production and operation, navigation and communication, daily life and other subsystems, and has a very important impact on the operation of the ship. Due to the characteristics of the micro-grid of the ship and the use of a large number of power electronic equipment, the reliability of the power system of the ship is reduced, and the power quality of the power grid continues to decline. This paper studies the power parameter monitoring of the ship’s power grid, and designs a power parameter monitoring system for the ship’s power grid, which can monitor the power parameters of the ship’s power grid in real time. It is helpful to master the operation of the ship power system, and plays a positive role in improving the power quality of the ship power grid, and ensuring the safety and economic operation of the ship power system.
Bioinspired solution to finding passageways in foliage with sonar
Authors: Wang Ruihao , Müller Rolf 
Published: September 2021

Abstract
Finding narrow gaps in foliage is an important component skill for autonomous navigation in densely vegetated environments. Traditional approaches are based on collecting large amounts of data with high spatial resolution. However, the biosonar systems of bats that live in dense habitats demonstrate that finding gaps is possible based on sensors with angular resolutions that are poor compared to technologies such as man-made sonar and lidar. To investigate these capabilities, we have used a biomimetic sonar head to ensonify artificial hedges in the laboratory. We found that a conventional approach based on echo energy performed poorly on detecting gaps with the area under the receiver operating characteristic (ROC) curve ranging from 0.69 to 0.75 depending on the distance to the hedge and gap width. A deep-learning approach based on a convolutional neural network (CNN) operating on the echo spectrograms achieved area under the ROC curve (AUC) values between 0.94 and 0.97. Class activation mapping indicated that the rising flank of the echoes was critical for detecting the gaps. As a consequence, a simple code consisting of first threshold-crossing times was able to almost reproduce the performance of the CNN classifier (AUC 0.9 to 0.95). This demonstrates that the echo waveforms contained patterns that were indicative of a gap in the foliage but did not suffer from the comparatively large beamwidth used.
Study on the anticancer activity of Poria cocos extract mediated gold nanoparticles in the treatment of pancreatic cancer
Authors: Nie Miao , Sun Peijun 
Published: September 2021

Abstract

Poria cocos, a fungus used extensively in the Chinese herbal medicine, has been known for myriad of pharmacological applications. There is a growing body of evidence on developing medications for antitumor therapies. The study is aimed to investigate the antitumor potential of gold nanoparticles synthesized from P. cocos extract against pancreatic cancer cells. Firstly, gold nanoparticles were generated from P. cocos extract and characterized through several techniques. The analysis unveiled the average size of nanomaterial as 24 nm. Remarkably, gold nanoparticles synthesized from P. cocos extract showed significant cytotoxic activities. Accumulation of ROS in pancreatic cancer cells is evidenced through the cell permeable probe. Furthermore, to substantiate the ROS-mediated apoptotic event, quantitative real-time PCR was carried out. The results revealed the upregulation of of caspase-3, caspase-9 and Bax in gold nanoparticle treated PANC-1 cancer cells. These findings unravelled the ROS-mediated caspase-dependent apoptotic event in pancreatic cancer cells by gold nanoparticles synthesized from P. cocos extract. However, further research in preclinical work would shed light on therapeutic potential of this green-synthesized nanoparticles.
Research on the characteristics of atmospheric air dielectric barrier discharge under different square wave pulse polarities
Authors: JIANG Song , HUANG Lifei , WU Zhonghang , WANG Yonggang , LI Zi , RAO Junfeng 
Published: September 2021

Abstract
Energy efficiency limits the application of atmospheric pressure dielectric barrier discharge (DBD), such as air purification, water treatment and material surface modification. This article focuses on the electrical and optical effects of the DBD under three square wave pulses polarities-positive, negative and bipolar. The result shows that under the same voltage with the quartz glass medium, the discharge efficiency of bipolar polarity pulse is the highest due to the influence of deposited charge. With the increase of air gap distance from 0.5 to 1.5 mm, average power consumed by the discharge air gap and discharge efficiency decrease obviously under alumina, and increase, and then decrease under quartz glass and polymethyl methacrylate (PMMA). Through spectrum diagnosis, in the quartz glass medium, the vibration temperature is the highest under negative polarity pulse excitation. Under bipolar pulse, the vibration temperature does not change significantly with the change of air gap distance. For the three dielectric materials of quartz glass, alumina and PMMA, the molecular vibration temperature is the highest under the quartz glass medium with the same voltage. When the gap spacing, pulse polarity or dielectric material are changed, the rotational temperature does not change significantly.
One weight inequality for Bergman projection and Calderón operator induced by radial weight
Authors: Martín Reyes Francisco , Ortega Pedro , Peláez José , Rättyä Jouni 
Published: September 2021

Let

ω
\omega

and

ν
\nu

be radial weights on the unit disc of the complex plane such that

ω
\omega

admits the doubling property

sup

0
≤
r
>
1

∫
r
1

ω
(
s
)

d
s

∫

1
+
r

2

1

ω
(
s
)

d
s

>
∞

\sup _{0\le r>1}\frac {\int _r^1 \omega (s)\,ds}{\int _{\frac {1+r}{2}}^1 \omega (s)\,ds}>\infty

. Consider the one weight inequality

(\dag)

‖

P
ω

(
f
)

‖

L
ν
p

≤
C
‖
f

‖

L
ν
p

,

1
>
p
>
∞
,

\begin{equation} \|P_\omega (f)\|_{L^p_\nu }\le C\|f\|_{L^p_\nu },\quad 1>p>\infty ,\tag {\dag } \end{equation}

for the Bergman projection

P
ω

P_\omega

induced by

ω
\omega

. It is shown that the Muckenhoupt-type condition

A
p

(
ω
,
ν
)
=

sup

0
≤
r
>
1

(

∫
r
1

s
ν
(
s
)

d
s
)

1
p

(

∫
r
1

s

(

ω
(
s
)

ν
(
s

)

1
p

)

p
′

d
s
)

1

p
′

∫
r
1

s
ω
(
s
)

d
s

>
∞

\begin{equation*} A_p(\omega ,\nu )=\sup _{0\le r>1}\frac {\left (\int _r^1 s\nu (s)\,ds \right )^{\frac {1}{p}}\left (\int _r^1 s\left (\frac {\omega (s)}{\nu (s)^{\frac 1p}}\right )^{p’}\,ds \right )^{\frac {1}{p’}}}{\int _r^1 s\omega (s)\,ds}>\infty \end{equation*}

is necessary for (

\dag ) to hold, and sufficient if

ν
\nu

is of the form

ν
(
s
)
=
ω
(
s
)

(

∫
r
1

s
ω
(
s
)

d
s
)

α

\begin{align*} \nu (s)=\omega (s)\left (\int _r^1 s\omega (s)\,ds \right )^\alpha \end{align*}

for some

−
1
>
α
>
∞

-1>\alpha >\infty

. This result extends the classical theorem due to Forelli and Rudin for a much larger class of weights. In addition, it is shown that for any pair

(
ω
,
ν
)

(\omega ,\nu )

of radial weights the Calderón operator

H
ω
⋆

(
f
)
(
z
)
+

H
ω

(
f
)
(
z
)
=

∫

0

|

z

|

f

(
s

z

|

z

|

)

s
ω
(
s
)

d
s

∫
s
1

t
ω
(
t
)

d
t

+

∫

|

z

|

1

f

(
s

z

|

z

|

)

s
ω
(
s
)

d
s

∫

|

z

|

1

s
ω
(
s
)

d
s

\begin{equation*} H^\star _\omega (f)(z)+H_\omega (f)(z) =\int _{0}^{|z|} f\left (s\frac {z}{|z|}\right )\frac {s\omega (s)\,ds}{\int _s^1 t\omega (t)\,dt} +\frac {\int _{|z|}^1f\left (s\frac {z}{|z|}\right ) s\omega (s)\,ds}{\int _{|z|}^1 s\omega (s)\,ds} \end{equation*}

is bounded on

L
ν
p

L^p_\nu

if and only if

A
p

(
ω
,
ν
)
>
∞

A_p(\omega ,\nu )>\infty

.
Symmetry and stability of non-negative solutions to degenerate elliptic equations in a ball
Authors: Brock F. , Takáč P. 
Published: September 2021

We consider non-negative distributional solutions

u
∈

C
1

(

B
R

¯

)

u\in C^1 (\overline {B_R } )

to the equation

−
div
⁡
[
g
(

|

∇
u

|

)

|

∇
u

|

−
1

∇
u
]
=
f
(

|

x

|

,
u
)

-\operatorname {div} [g(|\nabla u|)|\nabla u|^{-1} \nabla u ] = f(|x|,u)

in a ball

B
R

B_R

, with

u
=
0

u=0

on

∂

B
R

\partial B_R

, where

f
f

is continuous and non-increasing in the first variable and

g
∈

C
1

(
0
,
+
∞
)
∩
C
[
0
,
+
∞
)

g\in C^1 (0,+\infty )\cap C[0, +\infty )

, with

g
(
0
)
=
0

g(0)=0

and

g
′

(
t
)
>
0

g’(t)>0

for

t
>
0

t>0

. According to a result of the first author, the solutions satisfy a certain ‘local’ type of symmetry. Using this, we first prove that the solutions are radially symmetric provided that

f
f

satisfies appropriate growth conditions near its zeros.

In a second part we study the autonomous case,

f
=
f
(
u
)

f=f(u)

. The solutions of the equation are critical points for an associated variation problem. We show under rather mild conditions that global and local minimizers of the variational problem are radial.
Finding critical points of the Trudinger-Moser functional through the heat flow
Authors: Wang Yamin , Yang Yunyan 
Published: September 2021

Let

Ω
⊂

R

2

\Omega \subset \mathbb {R}^2

be a smooth bounded domain and

W
0

1
,
2

(
Ω
)

W_0^{1,2}(\Omega )

be the standard Sobolev space. In this paper, using the heat flow of Lamm-Robert-Struwe [J. Funct. Anal. 257 (2009), pp. 2951–2998] and blow-up analysis, we study the critical points of the Trudinger-Moser functional

J
(
u
)
=

∫
Ω

exp
⁡
(
4
π

u
2

)
d
x

\begin{equation*} J(u)=\int _\Omega \exp (4\pi u^2)dx \end{equation*}

under the constraint

E

(
1
)
=

{
u
∈

W
0

1
,
2

(
Ω
)
:

∫
Ω

|

∇
u

|

2

d
x
=
1
}

.

\begin{equation*} {E}(1)=\left \{u\in W_0^{1,2}(\Omega ):\int _\Omega |\nabla u|^2dx=1\right \}. \end{equation*}

Precisely, for certain initial data

u
0

u_0

, we obtain that up to a subsequence, the flow converges to a critical point of

J
J

under the constraint

E
(
1
)

E(1)

. This complements the results of Lamm-Robert-Struwe.
Precise dispersive estimates for the wave equation inside cylindrical convex domains
Authors: Len Meas 
Published: September 2021

In this work, we establish precise local in time dispersive estimates for solutions of the model case Dirichlet wave equation inside cylindrical convex domains

Ω
⊂

R

3

\Omega \subset \mathbb {R}^3

with smooth boundary

∂
Ω
≠
∅

\partial \Omega \neq \emptyset

. This result is the improved estimates established by Len Meas [C. R. Math. Acad. Sci. Paris 355 (2017), pp. 161–165]. Let us recall that dispersive estimates are key ingredients to prove Strichartz estimates. Strichartz estimates for waves inside an arbitrary domain

Ω
\Omega

have been proved by Blair, Smith, Sogge [Proc. Amer. Math. Soc. 136 (2008), pp. 247–256; Ann. Inst. H. Poincaré Anal. Non Linéaire 26 (2009), pp.1817–1829]. Optimal estimates in strictly convex domains have been obtained by Ivanovici, Lebeau, and Planchon [Ann. of Math. 180 (2014), pp. 323–380]. Our case of cylindrical domains is an extension of the result of Ivanovici, Lebeau, and Planchon [Ann. of Math. 180 (2014), pp. 323–380] in the case when the nonnegative curvature radius depends on the incident angle and vanishes in some directions.
Using leaf shape to determine leaf size could be a game-changer. A commentary on: ‘Leaf size estimation based on leaf length, width and shape’
Authors: Leigh Andrea 
Published: September 2021

This article comments on:
Julian Schrader, Peijian Shi, Dana L Royer, Daniel J Peppe, Rachael V Gallagher, Yirong Li, Rong Wang, Ian J Wright, Leaf size estimation based on leaf length, width and shape, Annals of Botany, Volume 128, Issue 4, 17 September 2021, Pages 395–406 https://doi.org/10.1093/aob/mcab078