bluuebunny/crossref_metadata_2025_split huggingface dataset:
3D simulations of inertial confinement fusion implosions part 1: inline modeling of polarized cross beam energy transfer and subsequent drive anomalies on OMEGA and NIF
Authors: Colaïtis A , Edgell D , Igumenshchev I , Turnbull D , Strozzi D J , Chapman T , Goncharov V , Froula D H 
Published: November 2022

Abstract
Inertial confinement fusion experiments are sensitive to cross-beam energy transfer (CBET), a laser-plasma instability that redistributes laser energy in the coronal plasma through self-generated ion acoustic wave (IAW) gratings. The detailed CBET coupling depends on the polarization state of the crossing wavefields. CBET itself can also scramble the beam polarizations by inducing ellipticity through the IAW grating, and rotating the seed polarization toward that of the pump. We develop a ray-based model that describes the polarized CBET coupling and that is compatible with the framework of 3D inline radiative hydrodynamics simulations. The model is implemented in the ASTER/IFRIIT code and verified against an academic test case and an offline polarized CBET post-processor. It is then applied to the detailed configuration of the distributed polarization rotator system on OMEGA, where results highlight how polarized CBET induces significant low modes in the collisional absorption source term. Finally, the modeling is applied to a simple indirect-drive configuration, comparing CBET calculations with 96 unpolarized or polarized beams with 24 unpolarized quads. It is shown that these cases produce similar power amplification per cone of beams grouped with similar polar angles. However, the 96 beam geometry itself is found to reduce azimuthal variations in quad power after the interaction and favors beams with larger polar angles within the cones, an effect that is amplified by the polarized CBET. Application of the model to inline calculations of OMEGA implosions are presented in a companion paper.
The capture of injected 1+ ions in charge breeder electron cyclotron resonance ion source plasma
Authors: Tarvainen O , Angot J , Thuillier T , Migliore M , Maunoury L , Chauveau P 
Published: November 2022

Abstract
The capture process of the 1+ ions in charge breeder electron cyclotron resonance ion sources has been attributed to cumulative small-angle scattering of the incident ions in ion–ion collisions with the buffer gas ions. The model results in controversy between the plasma potential and ion temperature values derived from simulations, and those found in the experiments. We demonstrate that the 1+ ion capture process is dominated by the slowing down of the incident ions by the ambipolar plasma potential, which has previously been assigned with a secondary importance. In this revised view, supported by experimental data, the 1+ capture does not depend on the mass of the injected and plasma ion species, or the ion temperature, which resolves the disagreement between modelling and experiments.
A novel two degree of freedom single magnet bistable energy harvester based on internal resonance
Authors: Huang Wenbin , Chen Zhiwen , Lin Wanrong , Wang Sijia , Xie Zhengqiu 
Published: November 2022

Abstract
Up to now, many nonlinear techniques such as bistable structure have been used to harvest vibration energy from the environment to achieve a wide response bandwidth. However, most bistable harvesters require two opposing magnets to form the potential energy function, which limits the miniaturization of the harvesters. In this paper, a two-degree-of-freedom U-shaped single magnet bistable energy harvester (SMBEH) based on the internal resonance technique is proposed. The harvester consists of a U-shaped beam, a magnet and a tip mass. The governing equations of the system are derived and the output performance of the harvester is obtained through numerical simulation and experiments which are in good agreement. The proposed SMBEH can achieve low frequency energy harvesting by utilizing a 1:2 internal resonance. When the excitation amplitude is equal to 0.4 g, the SMBEH can produce a significant output in two frequency ranges from 7 Hz to 7.7 Hz and 11.7 Hz to 15.73 Hz, which broaden the output frequency band. In the end, the output performance of SMBEH at different resistances and the charging performance were verified, respectively.
Modelling anomalous diffusion in semi-infinite disordered systems and porous media
Authors: Metzler Ralf , Rajyaguru Ashish , Berkowitz Brian 
Published: November 2022

AbstractFor an effectively one-dimensional, semi-infinite disordered system connected to a reservoir of tracer particles kept at constant concentration, we provide the dynamics of the concentration profile. Technically, we start with the Montroll–Weiss equation of a continuous time random walk with a scale-free waiting time density. From this we pass to a formulation in terms of the fractional diffusion equation for the concentration profileC(x,t)in a semi-infinite space for the boundary conditionC(0,t)=C0, using a subordination approach. From this we deduce the tracer flux and the so-called breakthrough curve (BTC) at a given distance from the tracer source. In particular, BTCs are routinely measured in geophysical contexts but are also of interest in single-particle tracking experiments. For the ‘residual’ BTCs, given by1−P(x,t), we demonstrate a long-time power-law behaviour that can be compared conveniently to experimental measurements. For completeness we also derive expressions for the moments in this constant-concentration boundary condition.
Observation of multiple rotons and multidirectional roton-like dispersion relations in acoustic metamaterials
Authors: Zhu Zhenxiao , Gao Zhen , Liu Gui-Geng , Ge Yong , Wang Yin , Xi Xiang , Yan Bei , Chen Fujia , Shum Perry Ping , Sun Hong-xiang , Yang Yihao 
Published: November 2022

Abstract
Roton dispersion relations were firstly predicted by Landau and have been extensively explored in correlated quantum systems at low temperatures. Recently, the roton-like dispersion relations were theoretically extended to classical acoustics, which, however, have remained elusive in reality. Here, we report the experimental observation of roton-like dispersions in acoustic metamaterials with beyond-nearest-neighbour interactions at ambient temperatures. The resulting metamaterial supports multiple coexisting modes with different wavevectors and group velocities at the same frequency and broadband backward waves, analogous to the ‘return flow’ termed by Feynman in the context of rotons. By increasing the order of long-range interaction, we observe multiple rotons on a single dispersion band, which have never appeared in Landau’s prediction or any other condensed-matter or classical-wave studies. Moreover, we have also theoretically proposed and experimentally observed multidirectional roton-like dispersion relations in a two-dimensional nonlocal acoustic metamaterial. The realization of roton-like dispersions in metamaterials could pave the way to explore novel physics and applications on quantum-inspired phenomena in classical systems.
The Simulation Analysis of IGBT Module Based on COMSOL
Authors: Qiu Guoqing , Wang Wei , Xu Shengyou , Yang Xin , Jiang Kedi 
Published: November 2022

Abstract
IGBT, as the core device of high-capacity power electronic equipment, its stability is directly relevant to the normal operation of the equipment. It would cause system failure and major security incidents if aging failure phenomenon occurs. A complex multi-physical field coupling process is involved in the aging failure of IGBT. Based on Comsol software, this paper conducts a series of simulations on IGBT module model SKM50GB12T4, and also improves the simulation of the solder layer voids by combining with related literature on materials science to provide a basis for subsequent research on IGBT.
Research on reactive power optimization of distributed photovoltaic power distribution based on improved PSO algorithm
Authors: Chen Shuhao , Yuan Ting , Lin Fei 
Published: November 2022

Abstract
When photovoltaic power is connected to the distribution network, its power status will change due to its instability. However, some reactive power optimization methods only optimize a single index, ignoring the overall complexity of the power grid and under the influence of the limitation of the optimization algorithm, resulting in a poor reactive power optimization effect. The improved PSO algorithm is used to study the reactive power optimization of distributed PV power distribution. The power flow of PV access is calculated by analyzing the influence mechanism of PV access. After improving the PSO algorithm by niche, Tabu search algorithm, and trigonometric function, the multi-objective reactive power optimization model was solved to realize the distribution reactive power optimization under the influence of photovoltaic access. In the experimental study of the reactive power optimization effect of the IEE333 network, the total voltage deviation of network nodes optimized by the improved PSO algorithm is reduced by about 59.06%, which effectively reduces the power grid energy damage and improves the optimization efficiency.
Finite Element Analysis of Piston of a Marine Low Speed Engine Based on Fluid-Thermal-Structure Coupling
Authors: Gao Wenxiang , Wang Guixin , Cao Yilong , Zhu Jialiang , Jia Sensen , Li Xiaobo 
Published: November 2022

Abstract
The piston of low speed diesel engine works in bad environment and bears large thermal and mechanical load, so it is necessary to study the piston. In this paper, a Marine low-speed diesel engine piston as the research object, builds the piston component - crosshead assembly - connecting rod - crankshaft model, simulation of the piston in the working process of the actual working condition, through professional simulation software for fluid-thermal-structure coupling calculation, the temperature field and coupling stress field of piston assembly are obtained. In this paper, the convective heat transfer coefficient and fluid temperature on the surface of the piston cooling oil chamber are obtained by CFD simulation, the temperature field of the piston assembly is obtained by fluid-thermal coupling, and the coupling stress field and deformation of the piston assembly are obtained by fluid-thermo-solid coupling. Finally, the maximum temperature of the piston is 313.9°C, the maximum deformation is 1.03mm, and the maximum stress is 347.4Mpa, which meet the requirements.
Development of Ni-B electroless coating from stabilizer free bath and characterization of high temperature tribological behaviour, scratch and corrosion resistance
Authors: Agrawal Rohit , Mukhopadhyay Arkadeb 
Published: November 2022

Abstract
The current work investigates the effects of variation of coating bath temperature on friction and wear behaviour of electroless Ni–B (ENB) coatings developed from stabilizer free bath. Coating is applied to specimens made up of AISI 1040 steel. Coatings were deposited at three different coating bath temperatures (85 °C, 90 °C and 95 °C). Field emission scanning electron microscopy, inductively coupled plasma-optical emission spectrometer, and x-ray diffraction were used to characterize the coating for surface morphology, chemical composition, and phase structure respectively. Pin-on-disc tribo-tester was used to estimate the friction and wear behaviour of ENB coatings at room temperature (25 °C), 100 °C, 200 °C and 300 °C. The coefficient of friction was higher at high temperature due to higher roughness of the coatings obtained from stabilizer free bath, adhesion and ploughing. The wear rate at 200 °C or 300 °C was lower compared to 100 °C. Additionally, the ENB coatings were subjected to thermogravimetric analysis which reveals higher thermal stability of coatings obtained at 95 °C. A scratch tester at constant (6 N) and progressive load (5–24 N) was used to estimate the coatings scratch hardness and adhesion. The corrosion behaviour of ENB coatings in 3.5% NaCl was studied using potentiodynamic polarization tests. The Ni-B coated specimens could efficiently provide barrier protection to steel substrate. But the corrosion potential was lower compared to lead stabilized bath.
Theoretical study of nickel-doped zinc oxide interaction with methylene blue and methyl orange using DFT methods
Authors: Oktavianti Nanik Ismi , Anindika Garcelina Rizky , Ivansyah Atthar Luqman , Kusumawati Yuly 
Published: November 2022

Abstract
In this research, the adsorption of methylene blue (MB) and methyl orange (MO) on ZnO and nickel-doped ZnO (Ni-ZnO) clusters was investigated through the density functional theory (DFT). The study included the interaction with ionized MB, neutral MB, ionized MO and neutral MO. In the case of Ni-doped ZnO, the two probabilities of nickel multiplicities (1 and 3) have been included in the investigation. The interaction between water and ZnO cluster as well as water with Ni-ZnO multiplicity 1 and multiplicity 3 was also studied. The results showed that nickel doping can decrease the bandgap 25.38% which is promising to shift the UV source to the visible range in the photocatalytic process. For photocatalyst application it will bring the more benefit because it requires the lower energy. Moreover, the nickel doped induce the dye adsorp stronger when the dye attached to dircetly the zinc ion. This guide to design the N-doped ZnO photocatalyst with no nickel atoms on the surface of the photocatalyst.
Combined leaching of Carlin-type gold deposit in Guizhou by potassium chlorate and bleaching powder
Authors: Yuan Xin , Tang Dao-wen , Zou Tao , Xu Cai-wu , Qiu Yang 
Published: November 2022

Abstract
Cyanidation has been considered an effective process for extracting gold from gold-bearing ores for over 100 years. However, this process also has several disadvantages including it being toxic, inefficient, and unsuitable for leaching gold from carbonaceous gold ores containing organic and inorganic carbons. Moreover, it is not feasible for the extraction of gold from refractory gold ores , which are increasingly being used.Therefore, there is an urgent need to find an environmentally friendly and efficient leaching method to improve the extraction rate of gold from refractory gold ores. This study discusses using potassium chlorate and bleaching powder for combined leaching of refractory gold ore. Compared with other leaching methods, this method does not require the pre-oxidizing of the refractory gold ore. Moreover, the optimal reaction temperature required for the reaction is lower, thus achieving efficient and environmentally friendly leaching of refractory gold ore. To improve on the method, we used response surface methodology (RSM). RSM can quickly determine the quadratic function connection between the response value and each component and optimize the experimental settings to precisely forecast the experimental findings, saving a significant amount of time and money.This study presents a response surface approach based on a thermodynamic analysis of gold-bearing mineral oxidation to analyze the primary composite design experiment. The response surface model uses four components and three levels of potassium chlorate concentration, bleaching powder addition, reaction temperature, and reaction pH. The model gives 0.16 mol l−1 potassium chlorate, 37.5 g bleaching powder, 25 °C reaction temperature, and reaction pH of 13 as the optimal conditions for leaching gold using potassium chlorate and bleaching powder. Under these conditions, the gold leaching rate can reach 90.84%. In addition, the following parameters influence combined gold leaching in decreasing order: bleaching powder dose, reaction temperature, potassium chlorate concentration, and reaction pH.The results show that potassium chlorate and bleaching powder combined is advantageous for leaching of Carlin-type gold ore in Guizhou. It provides a high leaching rate. There is no need for pre-oxidation of gold ore. It is a simple inexpensive process that can be operated at a low optimum reaction temperature. Thus, it is a feasible method in industrial applications and provides a new way for gold leaching.
A molecular dynamics study on water lubrication of amorphous cotton fiber sliding against chromium
Authors: Fan Pengwei , Geng Liuyuan , Jiang Kaixiang , Fang Wenjuan , Zhang Youqiang 
Published: November 2022

Abstract
This study investigates the influence of sliding velocity and loading on the friction of chromium and amorphous cotton fibers using water molecules act as lubricants via molecular dynamics simulation. It is found that the movement of water molecules between the contact interfaces is mainly along the sliding-direction not than the loading-direction during the sliding process. The high sliding velocity or large loading will reduce the lubricating properties of water molecules and increase the average coefficient of friction in the stabilization. The sliding time before the stabilization increase with sliding velocity while decreases with loading. Moreover, the water-lubricants can reduce the damage to chromium, and the increase of sliding velocity is more easy to cause the damage than loading, so it is more important to choose a right sliding velocity.
Stochastic entropy production for continuous measurements of an open quantum system
Authors: Matos D , Kantorovich L , Ford I J 
Published: November 2022

Abstract
We investigate the total stochastic entropy production of a two-level bosonic open quantum system under protocols of time dependent coupling to a harmonic environment. These processes are intended to represent the measurement of a system observable, and consequent selection of an eigenstate, whilst the system is also subjected to thermalising environmental noise. The entropy production depends on the evolution of the system variables and their probability density function, and is expressed through system and environmental contributions. The continuous stochastic dynamics of the open system is based on the Markovian approximation to the exact, noise-averaged stochastic Liouville-von Neumann equation, unravelled through the addition of stochastic environmental disturbance mimicking a measuring device. Under the thermalising influence of time independent coupling to the environment, the mean rate of entropy production vanishes asymptotically, indicating equilibrium. In contrast, a positive mean production of entropy as the system responds to time dependent coupling characterises the irreversibility of quantum measurement, and a comparison of its production for two coupling protocols, representing connection to and disconnection from the external measuring device, satisfies a detailed fluctuation theorem.
Two-neutron drip lines of a few single lambda hypernuclei
Authors: Meoto E F 
Published: November 2022

Abstract
Two-neutron drip lines of a few single lambda hypernuclei are studied through a phenomenological binding energy model. This model, which is built from the Bethe-Weizsäcker formula, explicitly takes into account hyperon mass and strangeness. For the hypernuclear isotopic chains of the elements C—Mn, the heaviest isotope in each chain that is stable with respect to two-neutron decay is located.
The effect of flood experience on public preferences for land preservation: evidence from referendum votes
Authors: Liu Xian 
Published: November 2022

Abstract
In response to losses of open space, local open space referenda have become a popular means for land preservation in the U.S. This study is the first to empirically examine the relationship between flood experience and voter support for open space referenda. We collect data on open space referenda between 2001 to 2015 from the Trust for Public Land’s (TPL) LandVote database. Flood occurrence and damage data are derived from the Spatial Hazard Events and Losses Database for the United States (SHELDUS) database. Our findings suggest that voters become less supportive of subsequent open space ballot measures if their communities recently experienced a flood event. Our preferred specification indicates that a flood would decrease the odds of a ‘yes’ vote by about 7.5%. If we use flood damage data to measure disaster impacts, our results show that a 10% increase in flood damage is expected to decrease the odds of a ‘yes’ vote by about 6%. These findings are consistent with recent experimental research showing that disaster exposure has a negative effect on preferences for local public good investments.
Critical dopant concentrations govern integer and fractional charge-transfer phases in doped P3HT
Authors: Hase Hannes , Berteau-Rainville Melissa , Charoughchi Somaiyeh , Bodlos Wolfgang , Orgiu Emanuele , Salzmann Ingo 
Published: November 2022

Abstract
The conjugated polymer poly(3-hexylthiophene) (P3HT) p-doped with the strong acceptor tetrafluorotetracyanoquinodimethane (F4TCNQ) is known to undergo ion-pair (IPA) formation, i.e. integer-charge transfer, and, as only recently reported, can form ground state charge-transfer complexes (CPXs) as a competing process, yielding fractional charge transfer. As these fundamental charge-transfer phenomena differently affect doping efficiency and, thus, organic-semiconductor device performance, possible factors governing their occurrence have been under investigation ever since. Here, we focus on the role of a critical dopant concentration deciding over IPA- or CPX-dominated regimes. Employing a broad, multi-technique approach, we compare the doping of P3HT by F4TCNQ and its weaker derivatives F2TCNQ, FTCNQ, and TCNQ, combining experiments with semi-classical modeling. IPA, CPX, and neutral-dopant ratios (estimated from vibrational absorption spectroscopy) together with electron affinity and ionization energy values (deduced from cyclic voltammetry) allow calculating the width of a Gaussian density of states (DOS) relating to the highest occupied molecular orbital in P3HT. While a broader DOS indicates energetic disorder, we use grazing-incidence x-ray diffraction to assess spatial order. Our findings consider the proposal of nucleation driving IPA formation and we hypothesize a certain host-dopant stoichiometry to be key for the formation of a crystalline CPX phase.
Tits-type alternative for certain groups acting on algebraic surfaces
Authors: Arzhantsev Ivan , Zaidenberg Mikhail 
Published: November 2022

According to a theorem of Cantat [Ann. of Math. (2) 174 (2011), pp. 299–340] and Urech [J. Reine Angew. Math. 770 (2021), pp. 27–57], an analog of the classical Tits alternative holds for the group of birational automorphisms of a compact complex Kähler surface. We established in Arzhantsev and Zaidenberg [Int. Math. Res. Not. IMRN 2022 (2022), pp. 8162–8195] the following Tits-type alternative: if

X
X

is a toric affine variety and

G
⊂
Aut
⁡
(
X
)

G\subset \operatorname {Aut}(X)

is a subgroup generated by a finite set of unipotent subgroups normalized by the acting torus then either

G
G

contains a nonabelian free subgroup or

G
G

is a unipotent affine algebraic group. In the present paper we extend the latter result to any group

G
G

of automorphisms of a complex affine surface generated by a finite collection of unipotent algebraic subgroups. It occurs that either

G
G

contains a nonabelian free subgroup or

G
G

is a metabelian unipotent algebraic group.