bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on fatigue life of gun latch based on orthogonal test method
Authors: Yang G W , Shen Y L , Liu J , Xie Y Y 
Published: June 2023

Abstract
Aiming at the problem of fatigue damage of gun latch caused by long-term impact load, the fatigue life of gun latch was studied. Firstly, the finite element model of gun latch was established by using finite element method. Secondly, the static strength and fatigue life of the gun latch were calculated based on S-N curve and Miner’s linear damage accumulation theory. On this basis, the structural factors affecting the fatigue life of the bolt were analyzed, and four factors including the radial diameter of the latch, the axial bearing thickness of the latch, the spiral Angle of the latch support surface and the gun tail support surface, and the locking clearance between the bolt and the gun tail were set up, as well as three variation levels of each factor. Then, the fatigue life of nine groups of gun latches was simulated by orthogonal test method. In addition, the range analysis method was used to analyze the simulation results, and then the influence law and degree of each factor on the fatigue life of gun latch were obtained. Moreover, the optimal combination scheme of the structure parameters of the gun latch was determined by the comprehensive balance method, and then the finite element simulation was carried out to verify the structure of the gun latch. The results show that the maximum stress of the bolt decreases 21.5% and the maximum stress of the gun tail decreases 28.2%, and the maximum stress of the gun bolt is lower than the yield limit of the material. At the same time, the research also shows that the minimum fatigue life of the bolt increases greatly, the minimum fatigue life of the bolt body is 20.8 times of that before the test, and the minimum fatigue life of the gun tail is 102.1 times of that before the test. The results provide a reference for fatigue life analysis and structural design of gun latch.
Numerical calculation of barrel chamber mechanical wear based on the principle of dynamic pressure lubrication
Authors: Li Shuli , Wang Liqun , Yang Guolai 
Published: June 2023

Abstract
Thermal-chemical erosion and mechanical wear are the main factors restricting the service life of barrel weapons. Considering the lack of systematic research on the mechanical wear of the barrel weapons, this paper gives the display expression of the dynamic pressure lubrication friction coefficient in projectile-barrel clearance based on the principle of dynamic pressure lubrication. The trend of friction coefficient is basically consistent with the friction experiment data. In the framework of dynamic pressure lubrication friction, the mechanical wear model of artillery barrel is derived, and the mechanical wear model in the whole life cycle is calculated by using the ALE mesh adaptive technology. The results show that the derived mechanical wear model can accurately describe the material degradation of the barrel chamber. The mechanical wear is mainly concentrated at the beginning of the rifling and the muzzle. After 500 shots, the mechanical wear of the beginning of the rifling and the muzzle are generally 0.3mm and 0.4mm.
Research on the muzzle vibration displacement test method of large-caliber rifled gun based trinocular vision
Authors: Hongxiao Chao , Weixi Yang , Xin Cao , Gang Heng 
Published: June 2023

Abstract
To address the problem of inaccurate muzzle vibration displacement measurements caused by the twisting of the barrel at the moment of firing of large-caliber rifled gun, a vibration displacement test method of large-caliber rifled gun based trinocular vision is proposed. A high-precision measurement system for muzzle vibration displacement based on an orthogonal imaging method with three high-speed cameras has been built. Three high-speed cameras are placed at the side and rear of the gun at orthogonal angles to each other to collect two-dimensional digital images of the gun muzzle area. Accurate displacement of the muzzle height, azimuth and recoil direction is derived by image processing techniques and multi-dimensional displacement decoupling methods. In addition, the three cameras can realize the online self-verification of parameters such as ‘recoil’ and ‘twist’. The three-dimensional vibration displacement and torsion parameters of the muzzle of a 155mm gun were obtained by a test of firing range. The test results proved the validity and accuracy of the method for the muzzle vibration displacement of rifled gun.
Failure Analysis and Improved Design of the breechblock of the Chain Aautomatic Mechanism
Authors: Han RuFeng , Gao Ying , Wang Hongjin , Ma Chao , Zhang Lin 
Published: June 2023

Abstract
When a total of 1114 rounds of projectiles are fired, the grappling hook of the breechblock and the pin of the locking mechanism break at the place where cartridge case extraction takes place. A method combining experimental test and theoretical analysis is used to analyze the elastic-plastic deformation of the extraction system. The fatigue life of the grappling hook and the pin of the breechblock is calculated to be 1150 rounds. Through comprehensive improved design measures such as improvement of the load transfer path of the locking mechanism, the local structure, the material replacement, and the heat treatment process, the improved simulation results of the locking mechanism show that the fatigue life has reached 15,000 rounds. Up to now, the improved locking mechanism has withstood the failure-free firing of over 8,000 rounds, meeting the requirements of gun reliability indicators.
Avenues of Quantum Field Theory in Curved Spacetime, Genova, 14-16 Sep 2022
Authors: Carloni Sante , Cianci Roberto , Corradini Olindo , Flachi Antonino , Vignolo Stefano , Vitagliano Vincenzo 
Published: June 2023

The extreme conditions experienced in the early universe, close to a black hole or in the interior of a neutron star, provide the environment where the most violent natural phenomena take place. Our understanding of the physical processes occurring in these regimes is affected by the notorious difficulty in the development of a theory of quantum gravity, modelling the intertwining of the gravitational field and the quantum properties of the fields responsible for the other forces in nature. A different point of view is then achieved by defining a “mesoscopic” scale lying below the Planck energy scale but well away from the classical general relativity domain. At such a scale, the theoretical framework describing how quantized fields propagate in a curved background has accomplished outstanding results, like particle production in gravitational fields and black hole evaporation, establishing a highly non-trivial connection between thermodynamics, gravity, and quantum field theory.
Aside from suggesting novel intersections between quantum fields and gravity, an unexplored landscape of original ideas is taking shape and inspiring new exciting problems. Quantum field theory in curved spacetime has recently been proposed as a new tool to probe nuclear and condensed matter physics phenomenology, with the recent advances in research at the nanoscale offering an intriguing test to the semiclassical approach even from tabletop experiments.
Following this trend, the goal of Avenues of Quantum Field Theory in Curved Spacetime has been to bring together researchers working in different areas of quantum field theory with interest in its curved space applications in the area of gravity and beyond. The 3-days workshop - the third of a series initiated in 2018 in Japan, continued in Modena, and that had an unexpected stop due to the sadly well-known Covid19 facts - aimed to exchange ideas on what is (or is expected soon to become) topical and discuss potential interdisciplinary interactions in a stimulating and collaborative environment.
List of The Editorial Board and Organising Committee is available in this pdf.
Development of quality assurance dosimeter for brachytherapy based on CsPbBr3 and evaluation of applicability
Authors: Yang S.W. , Han M.J. , Shin Y.H. , Jung J.H. , Cho H.L. , Park S.K. 
Published: June 2023

Abstract
In brachytherapy, since a radioactive source is inserted
into the human body to kill tumor tissue, it is important to
accurately determine the positional accuracy of the source. In this
study, we aimed to develop a dosimeter that can be used for
brachytherapy using CsPbBr3. This material can replace existing
materials for radiation detectors because it is cheaper than others
and has a simple manufacturing process. In addition, the basic
performance of the dosimeter was evaluated by analyzing
reproducibility, linearity, position (distance) dependence, and
angular dependence with the 192Ir source. As a result of the
reproducibility evaluation, the relative standard deviation (RSD)
was 1.07%, which satisfied the standard deviation criteria of
1.50%. As a result of the linearity evaluation by linear regression
analysis, the R
2 value was 0.9991, which was higher than the
standard criterion of an R
2 value of 0.9990. As a result of the
position (distance) dependence evaluation, the signal value
decreased exponentially and uniformly according to the inverse
square law of the distance up to 3 cm. As a result of angular
dependence evaluation, the signal value of the dosimeter 10 cm away
from the front of the source was 5.64 μC, and the signal
values of the dosimeter 10 cm away from the sides of the source
were 8.49 μC on the left and 8.91 μC on the
right. From these four results of reproducibility, linearity,
position (distance) dependence, and angular dependence, we
anticipate that the manufactured CsPbBr3 dosimeter with
performance outcomes beyond the standards can be used as a dosimeter
for brachytherapy.
ZnO-based scintillating bolometers: new prospects to study double beta decay of 64Zn
Authors: Armatol A. , Broerman B. , Dumoulin L. , Giuliani A. , Khalife H. , Laubenstein M. , Loaiza P. , de Marcillac P. , Marnieros S. , Nagorny S.S. , Nisi S. , Nones C. , Olivieri E. , Pagnanini L. , Pirro S. , Poda D.V. , Scarpaci J.A. , Zolotarova A.S. 
Published: June 2023

Abstract
The first detailed study on the performance of a ZnO-based
cryogenic scintillating bolometer as a detector to search for rare
processes in zinc isotopes was carried out. A 7.2 g ZnO
low-temperature detector, containing more than 80% of zinc in its
mass, exhibits good energy resolution of baseline noise
1.0–2.7 keV FWHM at various working temperatures resulting in a
low-energy threshold for the experiment, 2.0–6.0 keV. The light
yield for β/γ events was measured as 1.5(3) keV/MeV,
while it varies for α particles in the range of
0.2–3.0 keV/MeV. The detector demonstrates an effective
identification of β/γ events from α events using
time-properties of only heat signals. The radiopurity of the ZnO
crystal was evaluated using the Inductively Coupled Plasma Mass
Spectrometry, an ultra-low-background High Purity Ge
γ-spectrometer, and bolometric measurements. Only limits were
set at the level of 𝒪(1–100) mBq/kg on activities of
40K, 137Cs and daughter nuclides from the
U/Th natural decay chains. The total internal α-activity was
measured as 22(2) mBq/kg, with a major contribution caused by
6(1) mBq/kg of 232Th and 12(2) mBq/kg of
234U. Limits on double beta decay (DBD) processes in
^64Zn and 70Zn isotopes were set on the level
of 𝒪(1017–1018) yr for various decay modes,
profiting from 271 h of acquired background data in the
above-ground lab. This study shows a good potential for ZnO-based
scintillating bolometers to search for DBD processes of Zn isotopes,
especially in 64Zn, with the most prominent spectral
features at ∼ 10–20 keV, like the two-neutrino double
electron capture. A 10 kg-scale experiment can reach the
experimental sensitivity at the level of
𝒪(1024) yr.
Kappa-carrageenan based hybrid hydrogel for soft tissue engineering applications
Authors: Safarpour F , Kharaziha M , Mokhtari H , Emadi R , Bakhsheshi-Rad H R , Ramakrishna Seeram 
Published: June 2023

Abstract
Biological materials such as cell-derived membrane vesicles have emerged as alternative sources for molecular delivery systems, owing to multicomponent features, the inherent functionalities and signaling networks, and easy-to-carry therapeutic agents with various properties. Herein, red blood cell membrane (RBCM) vesicle-laden methacrylate kappa-carrageenan (KaMA) composite hydrogel is introduced for soft tissue engineering. Results revealed that the characteristics of hybrid hydrogels were significantly modulated by changing the RBCM vesicle content. For instance, the incorporation of 20% (v/v) RBCM significantly enhanced compressive strength from 103 ± 26 kPa to 257 ± 18 kPa and improved toughness under the cyclic loading from 1.0 ± 0.4 kJ m−3 to 4.0 ± 0.5 kJ m−3 after the 5th cycle. RBCM vesicles were also used for the encapsulation of curcumin (CUR) as a hydrophobic drug molecule. Results showed a controlled release of CUR over three days of immersion in PBS solution. The RBCM vesicles laden KaMA hydrogels also supported in vitro fibroblast cell growth and proliferation. In summary, this research sheds light on KaMA/RBCM hydrogels, that could reveal fine-tuned properties and hydrophobic drug release in a controlled manner.
Decisions, options, and actions in the face of uncertainty: a systematic bibliometric and thematic review of climate adaptation pathways
Authors: Cradock-Henry Nicholas A , Kirk Nicholas , Ricart Sandra , Diprose Gradon , Kannemeyer Robyn 
Published: June 2023

Abstract
Climate change is already having adverse impacts, with place- and problem-based implications due to higher temperatures, prolonged droughts, and more frequent extremes. Despite uncertainty about the full extent of future change, adaptation will be required. Adaptation pathways (APs) planning is increasingly used as a methodological approach to identify, evaluate, and sequence adaptation options over time. Pathways link critical decisions to future conditions, providing a road map to support planning in the face of uncertainty. This systematic review identifies and assesses the rapidly growing APs literature, focusing on its definition, and application in diverse contexts. Using bibliometric and thematic analysis, we highlight scholarly networks driving innovation in this area, characterise theoretical and conceptual differences in framing, and derive insights for best practice. Results show the evolution in interpretation, framing and practice; from an initial focus on managing uncertainty with technological- and engineered-based approaches, through to more participatory, policy- and decision-relevant pathways. Pathways planning has become increasingly collaborative, and is now used to address climate adaptation outcomes, within the broader context of interacting and compounding stressors. Results also highlight challenges in conceptualising and operationalizing APs, including comprehensive accounting for costs, and navigating social dynamics involved in process development. Based on these findings we propose new avenues for research, to develop methodologies to better engage with stakeholders’ social, political, and economic concerns, and enhance learning for climate adapted futures.
Strategic siting and design of dams minimizes impacts on seasonal floodplain inundation
Authors: Hatchard Simbidzayi , Schmitt Rafael J P , Pianosi Francesca , Savage James , Bates Paul 
Published: June 2023

Abstract
Dams and reservoirs aid economic development but also create significant negative impacts. Dams fragment rivers and reduce longitudinal connectivity on a network scale. However, dams may also alter discharge regimes and flood peaks, consequently reducing floodplain inundation and lateral channel floodplain connectivity, which impacts floodplain associated ecosystems. Strategic planning has emerged as a promising approach to find a balance between dam impacts and benefits. Yet, strategic planning has predominantly focused on longitudinal connectivity due to the difficulty of including the complex interactions between dam design and operations, hydrologic regime alteration, and the hydrodynamic processes controlling downstream flood extent. Here, we present how to reduce conflicts between hydropower development and loss of floodplain inundation extent by jointly optimizing siting and design of many dams in a data scarce basin. We deploy a coupled hydrological—hydraulic simulation model linked to a multiobjective optimization framework to find development options with the least trade-offs between power generation and downstream impacts on floodplains. Our results for the Pungwe Basin in Mozambique indicate that whilst portfolios of many small storage and run-of-river diversion hydropower plants might create less impacts on the downstream floodplains, installation of some large storage dams would be necessary to attain higher levels of hydropower generation.
Variational eigenfunctions for excited states inspired by supersymmetric quantum mechanics and the Gram–Schmidt process
Authors: Batael Hugo O , Drigo Filho Elso 
Published: June 2023

Abstract
Factorization methods such as the Hamiltonian hierarchy have been useful to find eigenfunctions for Schrödinger equations, in particular, for potentials that are partially or approximately solvable. In this paper, an alternative approach is proposed to study excited states via the variational method. The trial functions are built from the exact or approximate superpotential for the ground state combined with the Gram–Schmidt process to ensure orthogonalization between the functions. The results found variationally for one dimensional potentials are compared with previous results from the literature. The energy eigenvalues obtained agree with previous ones and, for most of the results, the percentage difference between the proposed approach and others in the literature is less than 0.1%. The method introduced is an effective and intuitive approach to determine trial wave functions for the excited states. This approach can be useful in studying the Schrödinger equation and related problems which can be mapped onto a Schrödinger type-equation as, for example, the Fokker–Planck equation.
Linear Darboux polynomials for Lotka–Volterra systems, trees and superintegrable families
Authors: Quispel G R W , Tapley Benjamin K , McLaren D I , van der Kamp Peter H 
Published: June 2023

Abstract
We present a method to construct superintegrable n-component Lotka–Volterra (LV) systems with

3
n
−
2

parameters. We apply the method to LV systems with n components for

1
<
n
<
6

, and present several n-dimensional superintegrable families. The LV systems are in one-to-one correspondence with trees on n vertices.
On the Riemann–Hilbert approach to asymptotics of tronquée solutions of Painlevé I
Authors: Deaño Alfredo 
Published: June 2023

Abstract
In this paper, we revisit large variable asymptotic expansions of tronquée solutions of the Painlevé I equation, obtained via the Riemann–Hilbert approach and the method of steepest descent. The explicit construction of an extra local parametrix around the recessive stationary point of the phase function, in terms of complementary error functions, makes it possible to give detailed information about exponential-type contributions beyond the standard Poincaré expansions for tronquée and tritronquée solutions.
Sterilization and reuse of masks for a standardized exhaled breath collection device by autoclaving
Authors: Shawn Samuel T , Harshman Sean W , Davidson Christina N , Lee Jae Hwan , Jung Anne E , Parker Ariel , Hawkins M Aaron , Stamps Blake W , Pitsch Rhonda L , Martin Jennifer A 
Published: June 2023

Abstract
Exhaled breath research has been hindered by a lack of standardization in collection and analysis methodologies. Recently, the Respiration Collector for In Vitro Analysis (ReCIVA) sampling device has illustrated the potential to provide a consistent and convenient method for exhaled breath collection onto adsorbent media. However, the significant costs, compared to exhaled breath bags, associated with the standardized collector is believed to be the reason for limited widespread use by researchers in the exhaled breath field. For example, in addition to the sampling hardware, a single-use disposable silicon mask affixed with a filter is required for each exhaled breath collection. To reduce the financial burden, streamline device upkeep, reduce waste material, and ease the logistical burden associated with the single use masks, it is hypothesized that the consumable masks and filters could be sterilized by autoclaving for reuse. The masks were contaminated, autoclaved, and then tested for any surviving pathogens with spore strip standards and by measuring the optical density of cultures. The compound background collected when using the ReCIVA with new masks was compared to that collected with repeatedly autoclaved masks via thermal desorption gas chromatography mass spectrometry (TD-GC-MS). The capacity to block particulate matter of new filters was tested against that of autoclaved filters by introducing an aerosol and comparing pre-filter and post-filter particle counts. Finally, breath samplings were conducted with new masks and autoclaved masks to test for changes in measurements by TD-GC-MS of exogenous and endogenous compounds. The data illustrate the autoclave cycle sterilizes masks spiked with saliva to background levels (p = 0.2527). The results indicate that background levels of siloxane compounds are increased as masks are repetitively autoclaved. The data show that mask filters have significant breakthrough of 1 μm particles after five repetitive autoclaving cycles compared to new filters (p = 0.0219). Finally, exhaled breath results utilizing a peppermint ingestion protocol indicate two compounds associated with peppermint, menthone and 1-Methyl-4-(1-methylethyl)-cyclohexanol, and an endogenous exhaled breath compound, isoprene, show no significant difference if sampled with a new mask or a mask autoclaved five times (p > 0.1063). Collectively, the data indicate that ReCIVA masks and filters can be sterilized via autoclave and reused. The results suggest ReCIVA mask and filter reuse should be limited to three times to limit potentially problematic background contaminants and filter dysfunction.