bluuebunny/crossref_metadata_2025_split huggingface dataset:
High-throughput piezoelectric droplet dispenser driven by ultra-low voltage
Authors: Li Dege , Wang Jide , Yang Guodong , Wu Xinlei , Li Zihao , Hu Guofang , Wang Xiaolong , Liu Yonghong , Zhang Yanzhen 
Published: March 2023

Efficient and facile generation of tiny droplets is critical to many cutting-edge applications, such as flexible electronic skin, customized circuits, and micro-electro-mechanical systems. However, conventional piezoelectric inkjet printing techniques show more prominent problems of high driving voltage and relatively low printing frequency. Here, a novel principle for high-throughput droplet dispensing was proposed based on the resonance of the liquid column within the glass capillary. The mechanisms of this high-throughput piezoelectric droplet dispensing technique were studied both experimentally and theoretically. It is demonstrated experimentally that the resonance frequencies of different orders of the liquid column in the capillary fit perfectly with the theoretical value. It is further demonstrated that when the working frequency is close to the resonant frequency of piezoelectric ceramic, droplets can be ejected out by a driving voltage as low as 1 V. This ultra-low driving voltage and power consumption make this dispenser compatible with various digital transistor–transistor logic or complementary metal–oxide–semiconductor drive circuits without any power amplifier.
Productivity and semantic transparency
Authors: Tian Shen , Baayen R. Harald 
Published: March 2023

Abstract
We used word embeddings to study the relation between productivity and semantic transparency. We compiled a dataset with around 2700 two-syllable compounds that shared position-specific constituents (henceforth pivots) and some 1100 suffixed words. For each pivot and suffix, we calculated measures of productivity as well as measures of semantic transparency. For compounds, productivity (P) was negatively correlated with the number of types (V) and with the semantic similarity between non-pivot constituents and their compounds. Conversely, the greater semantic similarity of the pivot with either the compound or the non-pivot constituent predicted higher degrees of productivity. Visualization with t-SNE revealed clustering of suffixed words’ embeddings, but no by-pivot clustering for compounds, except for a minority of pivots whose regions in semantic space did not contain intruding unrelated compounds. A subset of these pivots was found to realize a fixed shift in semantic space from the base word to the corresponding compound, a property that also emerged for several suffixes. For these pivots, no correlation between P and V was present. Thus, Mandarin compounds appear to realize, at one extreme, motivated but unsystematic concept formation (where other pivots could just as well have been used), and at the other extreme, systematic suffix-like semantics.
A new formulation of general-relativistic hydrodynamic equations using primitive variables
Authors: Servignat Gaël , Novak Jérôme , Cordero-Carrión Isabel 
Published: March 2023

Abstract
We present the derivation of hydrodynamical equations for a perfect fluid in General Relativity, within the

3
+
1

decomposition of spacetime framework, using only primitive variables. Primitive variables are opposed to conserved variables, as defined in the widely used Valencia formulation of the same hydrodynamical equations. The equations are derived in a covariant way, so that they can be used to describe any configuration of the perfect fluid. Once derived, the equations are tested numerically. We implement them in an evolution code for spherically symmetric self-gravitating compact objects. The code uses pseudospectral methods for both the metric and the hydrodynamics. First, convergence tests are performed, then the frequencies of radial modes of polytropes are recovered with and without the Cowling approximation, and finally the performance of our code in the black hole collapse and migration tests are described. The results of the tests and the comparison with a reference core-collapse and neutron star oscillations code suggests that not only our code can handle very strong gravitational fields, but also that this new formulation helps gaining a significant amount of computational time in hydrodynamical simulations of smooth flows in General Relativity.
Improving the intrinsic conductance of selective area grown in-plane InAs nanowires with a GaSb shell
Authors: Khelifi W , Coinon C , Berthe M , Troadec D , Patriarche G , Wallart X , Grandidier B , Desplanque L 
Published: March 2023

Abstract
The nanoscale intrinsic electrical properties of in-plane InAs nanowires grown by selective area epitaxy are investigated using a process-free method involving a multi-probe scanning tunneling microscope. The resistance of oxide-free InAs nanowires grown on an InP(111)B substrate and the resistance of InAs/GaSb core–shell nanowires grown on an InP(001) substrate are measured using a collinear four-point probe arrangement in ultrahigh vacuum. They are compared with the resistance of two-dimensional electron gas reference samples measured using the same method and with the Van der Pauw geometry for validation. A significant improvement of the conductance is achieved when the InAs nanowires are fully embedded in GaSb, exhibiting an intrinsic sheet conductance close to the one of the quantum well counterpart.
A compact, friction self-matching, non-inertial piezo motor with scanning capability
Authors: Zhao Kesen , Hou Yubin , Zheng Shaofeng , Wang Jihao , Lu Yalin , Meng Wenjie , Lu Qingyou 
Published: March 2023

Abstract
Maintaining friction matching is the core issue for non-inertial piezo motors (PMs); this challenge severely limits their application in complex conditions such as variable temperature environments. To address this issue, a compact, optimal friction self-matching PM with non-inertial driving is reported in this paper. The motor is implemented with a narrow 5.5 mm-outer diameter piezoelectric scanner tube (PST) whose outer electrode is equally divided into two independently controllable PSTs. The PST, divided into two parts, clamps a sapphire rod between dual sapphire ball structures at both ends and an elastically supported sapphire ball at the centre. The device features a balanced normal force distribution scheme that allows friction forces acting on the sapphire rod at both ends and on the intermediate section to be approximately equal along the axial direction of the PST, achieving automatic optimal matching of friction, then it can operate like an inchworm motor. The feasibility of this scheme is verified by testing with a low threshold voltage down to 35 V at room temperature and 160 V at liquid nitrogen temperature. The motor dimensions are 5.5 mm × 5.5 mm ×35 mm (length × width × height). At room temperature, step size ranges from 0.1 μm to 1 μm. It has a maximum stroke about 5 mm and a maximum load of 40 g. This PM’s extreme compactness, low machine tolerance requirements, and smooth sequence make it ideally suited for building superior quality, atomically resolved scanning probe microscopy devices compatible with narrow spaces and extreme conditions.
Constraints on Yukawa gravity parameters from observations of bright stars
Authors: Jovanović P. , Borka Jovanović V. , Borka D. , Zakharov A.F. 
Published: March 2023

Abstract
In this paper we investigate a Yukawa gravity modification of the Newtonian gravitational
potential in a weak field approximation. For that purpose we derived the corresponding equations
of motion and used them to perform two-body simulations of the stellar orbits. In 2020 the GRAVITY
Collaboration detected the orbital precession of the S2 star around the supermassive black hole
(SMBH) at the Galactic Center (GC) and showed that it is close to the general relativity (GR)
prediction. Using this observational fact, we evaluated parameters of the Yukawa gravity (the
range of Yukawa interaction Λ and universal constant δ) with the Schwarzschild
precession of the S-stars assuming that the observed values as indicated by the GRAVITY
Collaboration will have a small deviation from GR prediction [1]. GR provides the most
natural way to fit observational data for S-star orbits, however, their precessions can be fitted
by Yukawa gravity. Our main goal was to study the possible influence of the strength of Yukawa
interaction, i.e. the universal constant δ, on the precessions of S-star orbits. We analyze
S-star orbits assuming different strength of Yukawa interaction δ and find that this
parameter has strong influence on range of Yukawa interaction Λ. For that purpose we use
parameterized post-Newtonian (PPN) equations of motion in order to calculate the simulated orbits
of S-stars in GR and Yukawa gravity. Using MCMC simulations we obtain the best-fit values and
uncertainties of Yukawa gravity parameters for S-stars. Also, we introduce a new criterion which
can be used for classification of gravitational systems in this type of gravity, according to
their scales. We demonstrated that performed analysis of the observed S-stars orbits around the GC
in the frame of the Yukawa gravity represent a tool for constraining the Yukawa gravity parameters
and probing the predictions of gravity theories.
The Dirac equation on metrics of Eguchi–Hanson type
Authors: Cai Zhuohua , Zhang Xiao 
Published: March 2023

Abstract
We investigate parallel spinors on the Eguchi–Hanson metrics and find the space of complex parallel spinors is complex two-dimensional. For the metrics of Eguchi–Hanson type with the zero scalar curvature, we separate variables for the harmonic spinors and obtain the solutions explicitly.
Studies of Heavy Pear-shaped Nuclei
Authors: Butler P A 
Published: March 2023

Abstract
For certain combinations of protons and neutrons it is expected that the shape of atomic nuclei can undergo octupole deformation, which would give rise to reflection asymmetry or a “pear shape”. Here it is described how recent experiments carried out at CERN using REX-ISOLDE and HIE-ISOLDE and the Miniball gamma-ray spectrometer have provided evidence that several radium and radon isotopes have either stable pear shapes or are octupole vibrational in nature. It will be shown that the data on transition moments present some challenges for theory. The relevance of these measurements for atomic EDM searches, and the future prospects for this field, will also be discussed.
Rare weak decays and neutrino mass
Authors: Kotila Jenni 
Published: March 2023

Abstract
The question whether neutrinos are Majorana fermions (i.e., their own anti-particles) remains among the most fundamental open questions of subatomic physics. If neutrinos are Majorana particles it would revolutionize our understanding of physics. Although neutrinoless double beta decay, 0νββ, was proposed more than 80 years ago to establish the nature of neutrinos, it remains the most sensitive probe into the non-conservation of lepton number. 0νββ-decay is a postulated extremely slow and yet unobserved radioactive process in which two neutrons (or protons) inside a nucleus transform into two protons (or neutrons) emitting two electrons (or positrons), respectively, but no neutrinos. Its observation would be a breakthrough in the description of elementary particles and would provide fundamental information on the neutrino masses, their nature, and origin. In this paper double beta decay, its connection to neutrino mass, and mechanisms beyond the standard mass mechanism are discussed from a theoretical point of view. The current situation is then addressed by combining theoretical results with recent experimental limits.
Lepton- and baryon-number violation in nuclear effective field theory
Authors: van Kolck U 
Published: March 2023

Abstract
Lepton and baryon numbers are accidental symmetries in the effective field theory (EFT) of the Standard Model. Their violation would lead to spectacular nuclear decays which can be described with nuclear EFTs. I discuss ways in which two such decays — the neutrinoless double-beta decay of heavy nuclei and the disappearance of the deuteron — provide complementary information to processes that take place outside the nuclear environment — neutrino masses, nucleon decay, and neutron-antineutron oscillations.
Zr isotopes as a case study for intertwined quantum phase transitions
Authors: Gavrielov N. 
Published: March 2023

Abstract
The scenario of intertwined quantum phase transitions (IQPTs) is identified in the Zr isotopes with neutron numbers 52–70, and shown to involve both a crossing of normal and intruder configurations and a shape-evolution within each configuration. Using the framework of the interacting boson model with configuration mixing, this situation is demonstrated by a quantum analysis of the spectra, E2 transition rates, order parameters, symmetry and configuration content of the wave functions and a classical analysis of energy surfaces.
Nuclear structure aspects of the heaviest N∼Z nuclei south of 100Sn
Authors: Górska M. , Albers H. M. , Arici T. , Banerjee A. , Benzoni G. , Blazhev A. , Cederwall B. , Das B. , Davinson T. , Gerl J. , Grawe H. , Hall O. , Hubbard N. , Jazrawi S. , Jolie J. , Mikołajczuk M. , Mistry A. K. , Mengoni D. , Podolyák Zs. , Polettini M. , Regan P. H. , Rüdigier M. , Yaneva A. , Vesic J. , Zhang G. 
Published: March 2023

Abstract
Ever-lasting interest in the structure of 100Sn and neighbouring nuclei is still well justified by the fact that it is the heaviest doubly-magic nucleus with N=Z. State-of-the-art experimental techniques involving stable and radioactive beam facilities have enabled access to these exotic nuclei. In particular, the analysis of experimental data obtained in two DESPEC experiments at GSI Darmstadt extends the information on the shell structure and its evolution towards N = Z = 50, and allows the study of seniority conservation and proton-neutron interaction in the g9/2 orbit. Several theoretical approaches for shell-model investigations are discussed and their predictive power assessed. The calculated systematics of the reduced transition probabilities for high- to medium-spin states in N∼Z isotopes with active g9/2 orbit is presented for the first time.
Relativistic Brueckner-Hartree-Fock Theory: an ab initio Approach for Nuclear Matter and for Finite Nuclei
Authors: Ring Peter , Wang Sibo , Tong Hui , Zhao Qiang , Wang Chencan , Meng Jie 
Published: March 2023

Abstract
Recent years have seen considerable progress with ab-initio calculations of the nuclear structure by non-relativistic many-body methods. Dirac-Brueckner-Hartree-Fock Theory provides a relativistic ab-intio approach, which is able to reproduce saturation properties of symmetric nuclear matter without three-body forces. However, so far, the corresponding equations have been solved only for positive energy states. Negative energy states have been included for forty years in various approximations, leading to differences in the isospin dependence. This problem has been solved only recently by a complete solution of the self-consistent relativistic Brueckner-Hartree-Fock equations in asymmetric nuclear matter. Due to its numerical complexity, however, it is very difficult to extend the Relativistic Brueckner-Hartree-Fock theory to the study of finite nuclear systems. Recent efforts will be discussed to overcome this problem.
Architecture design for civil aircraft hydraulic system
Authors: Chen Cai , Wang Xu , Zhou Changming 
Published: March 2023

Abstract
The hydraulic system is a highly complex system for civil aircraft. System Engineering is a method to solve complex and comprehensive problems. To reduce the development risk, this paper establishes a hydraulic system architecture design model based on system engineering using system ideas and analysis methods. With this model, several aspects of hydraulic system architecture design are discussed, including input, requirements analysis, functional analysis, system synthesis, and system balance.
Experimental study of flow in a cavity with the variable shape at a low Reynolds number
Authors: Liu Yuan , Liu Peiqing , Guo Hao 
Published: March 2023

Abstract
The flow structure of a cavity with a length-to-depth ratio of 2:1. In this experiment, the particle image velocimetry (PIV) technique was used to experimentally research the front and rear wall inclined cavity configurations with different inclinations. The experiments were carried out in a recirculating water tank. The configurations with front and rear wall inclination angles of 26°, 45°, and 56° were compared at the same incoming flow velocity. A total of seven different configurations are given for the comparison of several variables. In addition, the flow velocity, Reynolds stress and turbulence intensity values were measured and analyzed for all configurations. Correlation analysis is used to reveal the shear layer evolution process, and the outcomes indicate that the wall inclination changes the shape and size of the shear layer. The coherent structures of shear layers with different cavity shapes are identified in combination with appropriate proper orthogonal decomposition (POD). Different shapes of the cavity configuration may vary the size of the shear layer. The calculation of turbulence intensity also shows that the cavity configuration with the largest inclination angle has the largest cavity turbulence intensity at the centreline cross-section.
Research and Verification on the Solution of Pressure Fluctuation of the Fan Air Inlet of Civil Aircraft Pneumatic System
Authors: Peng Danqi 
Published: March 2023

Abstract
The cold side bleeds air of the precooler in the pneumatic system of civil aircraft is usually drawn out from the external bypass of the engine fan and enters the precooler for heat exchange through the fan air inlet, bellows, and fan air valve. When the fan air valve is closed, a closed dead cavity is formed in the fan air inlet. When the airflow passes through the mouth at high speed, the pressure of the fan air inlet into the mouth will oscillate at high frequency, resulting in pressure fluctuation, which will lead to the damage of the bellows and the loss of bleed air function. CFD is proposed in this paper. The method of dynamic simulation combined with limited test parameters successfully located the root causes of the fan air inlet pressure fluctuations, solved the fan air inlet pressure fluctuation phenomenon, and creatively put forward the fan air inlet with hat, fan air inlet with ventilation branch 2 broad categories, and 8 kinds of potential solution design train of thought. CFD simulation method is used to analyze and compare each potential solution in detail. Finally, the solution was selected according to the test results and applied to the aircraft.
Analysis of Load-Enhanced Factor(LEF) of MIL-P-25690B Acrylic Glass
Authors: Ma Yinglong 
Published: March 2023

Abstract
MIL-P-25690B acrylic glass is one of the primary materials currently used in transparent structural components of civil aircraft. In order to shorten the time of fatigue tests and reduce the cost, the load-enhanced factor (LEF) method is used for fatigue tests. The fatigue test load multiplies the LEF, which is amplified in the fatigue test. LEF, sample sizes, and fatigue test duration are correlated according to the CMH-17 composite materials handbook. According to MIL-P-25690B acrylic glass, the test scheme of LEF is determined; test results, test data analysis, and processing method are given. The relationship between LEF and the corresponding test duration under certain conditions is obtained, which provides a theoretical basis and analysis support for fatigue tests of transparent parts of civil aircraft.
Application of CFD Numerical Simulation Methods in the Field of UAV Research
Authors: Hu Xupei , Liu Junhao , Yang Fanfu , Yuan Mu 
Published: March 2023

Abstract
Unmanned aerial vehicle (UAV) has become one of the hot topics in today’s research. A drone’s short life has always been one of the main drawbacks, and fluid mechanics is related to the development of computer technology. CFD was used to simulate the aerodynamic parameters of UAVs and has become a more economical choice, which can greatly save the cost of materials. Solid-liquid coupling calculation generally chooses the SST k - Ω model to calculate and will also include an energy equation in the calculation. Then, according to the precision needs to choose a different order of upwind format. Choose either steady state or transient simulation according to different needs. CFD is widely used in research on the overall stability and reliability of UAVs and the experiment on the aerodynamic characteristics of UAV components.
Study on the Influence of Low-Frequency Flow Oscillation on the Atomization Characteristics of Gas-Centered Coaxial Centrifugal Nozzle
Authors: Kang Jinxin , Tong Yiheng , Jiang Chuanjin , Feng Songjiang , Shao Mingxue 
Published: March 2023

Abstract
The dynamic atomization characteristics of gas center coaxial centrifugal nozzle under the condition of pressure oscillation in the supply system were studied by applying external excitation through the flow pulsator. Obtaining spray image by high-speed photography while using hydro-mechanical pulsator to get generate of supply system. The results show that the spray width changes periodically with low-frequency pressure oscillation. For self-pulsation sprays, it is challenging to maintain a “Christmas tree” shape with low-frequency oscillation. Pressure oscillation can effectively suppress spray self-pulsation. However, the pressure oscillation amplitude may be much larger than that of the self-pulsation itself. Therefore, the premise of applying this method is that the applied external excitation cannot stimulate or amplify the combustion instability. The gas post-pressure drop determines the amplitude and frequency of the self-pulsation, while the excitation frequency will slightly affect the amplitude and frequency of the self-pulsation.
Sound Insulation Performance of the Stiffened Laminated Plate with Different Reinforcement Forms
Authors: Bu Y L , Chen L , Wang H F 
Published: March 2023

Abstract
A semi-analytical methodology on the sound transmission of stiffened laminated plate under different reinforcement forms is developed to explore its sound insulation performance under the action of a plane sound wave load, in accordance with the classical laminated plate theory and in consideration of stiffener flexion and torsional motions. The formula of acoustic transmission loss is obtained by utilizing spatial harmonic expansion and the virtual work principle. Subsequently, the predicted values of proposed methodology are validated by the existing models. Eventually, some characteristic parameters are considered to investigate their effects on sound insulation behavior.
Dual Mesh Technique for Hydroacoustic Prediction of Cavitating Flows around a Three-Dimensional Bullet
Authors: Yu Lianjie , Zhao Weiwen , Wan Decheng 
Published: March 2023

Abstract
Nowadays, hydroacoustics is of great importance. A major source of underwater noise is cavitation noise. One of the difficulties in cavitation noise prediction is its complex formation mechanism. In this paper, a cavitating bullet is taken as the research object, and detailed numerical simulation research of the local cavitation for this three-dimensional model is carried out. Ffowcs Williams and Hawkings equation (FW-H) is adopted. The quadrupole term is obtained by the direct volume integration method. Furthermore, dual mesh technique is adopted to achieve fast calculation. The results show that the dual mesh technology reduces the computational complexity of the nonlinear sound pressure significantly. With the appropriate acoustic grid size, the dual mesh method can ensure the same accuracy as the CFD grid. This provides a reliable way for the calculation of nonlinear sound pressure in the cavitation phenomenon.