bluuebunny/crossref_metadata_2025 huggingface dataset:
Materials and Actor Network Theory, a way to flesh out Life Cycle Assessment?
Authors: Birat Jean-Pierre
Published: June 2023

LCA (Life Cycle Assessment) is an established method to measure the economic, social and environmental impact of a good or a service, with particular attention to its value chain or its life cycle. However, it is heavily biased in favor of environmental issues, actually environmental burdens or stressors: the economic dimension is only tackled in LCC (Life Cycle Costing) and the social in a restricted approach called SLCA (Social Life Cycle Assessment). The idea of developing a more ambitious and wider encompassing method has been elusive, except when MFA (Material Flow Analysis) was proposed as an alternative and a competing discipline, but, eventually, the two methods proposed separate but complementary views of the world. In order to reach beyond LCA and its present weaknesses, it would be necessary to base the new approach on concepts embedded in SSH (Social Sciences and Humanities) rather than in STEM (Science Technology Engineering Mathematics) disciplines. This article describes the process under way to move in that direction. In a first step, a panorama will be drawn of the strengths and weaknesses of LCA and of LCT (Life Cycle Thinking). The analysis will focus on LCA weaknesses. On the way to extending LCA into SSH territory, an approach developed by Knowledge and Innovation, Italy, and called SCM (Social Cycle of Materials) looks at materials from a historical perspective. It shows how various resolutions (closures) are proposed to answer issues raised at different times, as a result of society’s demand. The method proposes a distinctly new way of looking at materials cycles. The connection between this new approach and the traditional LCA cycle remains, however, to be done. In this paper, we propose to use ANT (Actor Network Theory), a concept developed by Bruno Latour, Michel Callon and Madeleine Akrich, to propose reconstructing the concept of LCA. The approach ambitions to list the various “stakeholders” related to materials in their value chain, like what is done in LCA, but also across long time, like what is done in SCM, and to include all actors in the sense of ANT, which means inanimate objects as well as elements of the geosphere and of the biosphere. It is expected to gain some insight into moving away from the indicator-based style of LCA. Clearly, we are still exploring and, most probably, we may end up complementing traditional LCA, most certainly not replacing it.
Algorithms for three-machine flowshop scheduling problem to minimize makespan with uncertain processing times
Authors: Allahverdi Ali , Allahverdi Muberra
Published: June 2023

We address the three-machine flowshop scheduling problem to minimize makespan where processing times are uncertain within some lower and upper bounds. We propose sixteen algorithms based on Johnson’s algorithm, which is known to yield the optimal solution for the three-machine flowshop problem under certain cases. The proposed algorithms are computationally evaluated based on randomly generated data. Computational experiments indicate that one of the proposed algorithms, algorithm AL-7, significantly performs better than the rest. Tests of hypotheses were performed to statistically confirm the results. In algorithm AL-7, more weight is given to the processing times of jobs on the first and the third machines compared to those of the second machine. Moreover, both the lower and upper bounds of job processing times on all three machines are utilized. Furthermore, algorithm AL-7 is shown to perform the best regardless of the extreme distributions considered. Hence, it is recommended as the best algorithm.
An efficient multi parametric kernel function for large and small-update methods interior point algorithm for P*(κ)-horizontal linear complementarity problem
Authors: Mousaab Bouafia , Adnan Yassine
Published: June 2023

In this paper, we propose the first efficient multi parametric kernel function with logarithmic barrier term. A class of polynomial interior-point algorithms for P*(κ)-horizontal linear complementarity problem based on this kernel function, with parameters pi > 0 for all i ∈ 1, 2, , m, are presented. Then by using some simple analysis tools, we present a primal-dual interior point method (IPM) for P*(κ)-horizontal linear complementarity problems based on this kernel function. At the same time, we derive the complexity bounds small and large-update methods, respectively. In particular, if we take many different values of the parameters, we obtain the best known iteration bounds for the algorithms with large- and small-update methods are derived, namely, O((1 + 2κ)√n(log n)log n/ϵ) and O((1 + 2κ)√n log n/ϵ) respectively. We illustrate the performance of the proposed kernel function by some numerical results that are derived by applying our algorithm.
A Study on the Marketing Optimization Strategy of Exhibition Industry in Dalian under the "Dual Circulation" Development Paradigm
Authors: Li Ming , Li Liang
Published: June 2023

The Chinese government stressed the need to build a new development pattern with the domestic big cycle as the main body and the domestic and international double cycles promoting each other. As a convention and exhibition center city in Northeast Asia, Dalian’s exhibition industry has made brilliant achievements. However, in recent years, influenced by market competition, industrial policy adjustment and other factors, there are still some problems in the marketing strategy of Dalian exhibition industry, compared with the marketing strategy of exhibition industry in developed regions. Strengthening innovation leadership and optimizing marketing strategies will help promote industrial upgrading and transformation, and then improve the quality and efficiency of economic development. This study will provide reference value for the improvement and promotion of Dalian’s exhibition industry.
Evaluation of the level of quality development of the manufacturing industry in the Northeast
Authors: Xiao Yanling , Zhou Minghao , Yin Chengfeng , Ji Haiyang
Published: June 2023

This paper takes the manufacturing industry in the three northeastern provinces as the research object. It establishes an index system based on the connotation of high-quality development of the manufacturing industry from six aspects: development efficiency, green development, innovation-driven, quality brand, people's livelihood sharing, and openness, and measures it used the entropy-weight-TOPSIS method. The results show that, on the whole, the manufacturing industry in Northeast China has been steadily improving, and there are differences in the level of high-quality development of the manufacturing industry among the three provinces in Northeast China, showing that Liaoning is the highest, Jilin the second highest and Heilongjiang the lowest. From each subdivision dimension, there are also differences in the indicators of high-quality development of the manufacturing industry in the three provinces.
A Method for Classifying Residential Prices in Apartment Complex Using Computer Simulation Analysis: A Case Study
Authors: Yu Wenlong , Gao Fanqiang , Guo Bingyan , Li Jie , Li Bin , Cao Xiangyang
Published: June 2023

The price fluctuation of the real estate market has become an important factor affecting the stability of the national macro-economy. In the history of the worldwide financial crisis, there have been many times related to the real estate market. China's real estate industry occupies a pivotal position in the national economy, and entered a rapid development period in 2000, gradually becoming a pillar industry of the national economy. It ushered in the process of rapid expansion, with investment scale, construction scale, transaction scale and transaction price rising. From the perspective of noise and landscape, this paper discusses the possibility of applying landscape analysis to the price and pricing of apartment complexes. The noise, landscape and sunlight are analyzed based on the landscape analysis (including the point and line through the view analysis, and the line of sight analysis) to provide a basis for the unit price classification of the area.
Research on Innovative Development of Talents in Dalian Conference and Exhibition industry
Authors: Li Liang , Li Ming
Published: June 2023

In recent years, the conference and exhibition industry, as an emerging tertiary industry, has developed rapidly, which has played a vital role in promoting the economic construction and development of the city. This article has analysed the important role of human resources in the conference and exhibition industry in Dalian, and the current situation of talent development in the conference and exhibition industry in Dalian through literature research, investigation and analysis, and then points out that the existence of problems such as vague target positioning of talent demand in the exhibition industry in Dalian, unreasonable talent cultivation structure, imperfect education system and supporting facilities, and the disconnection of talent cultivation direction from regional economy have affected the development of regional economy in Dalian. Based on this situation, the optimization countermeasures for the innovative development of talents in Dalian’s conference and exhibition industry are proposed.
Research on the Impact of China's Carbon Trading Policy on the Carbon Emission Efficiency of Manufacturing Industry
Authors: Xu Hanwei , Liao Peiyi , Li Hao
Published: June 2023

China is under enormous pressure to cut emissions. This study enriched the empirical research on carbon trading at the industry level, in order to further test the contribution of carbon trading to China's carbon emission reduction. The results show that :(1) the implementation of carbon trading policy has a significant positive impact on the carbon emission efficiency of the six manufacturing industries, and the impact of each industry is heterogeneous. (2) Carbon trading policies do not significantly improve the carbon emission efficiency of each industry and region.
Comparison of R&D information disclosure of Chinese and foreign listed pharmaceutical enterprises – Take Hengrui Pharmaceutical and Pfizer Pharmaceutical as examples
Authors: Cai Yating
Published: June 2023

Recently, the demand for epidemic prevention equipment and therapeutic drugs at home and abroad has surged. In order to improve their competitiveness, enterprises have invested a lot of money in drug research and development and medical device innovation.This paper focuses on the research and analysis of the background conditions of drug research and development and information disclosure in China in recent years, and combines and expounds two scientific theoretical foundations related to information disclosure and disclosure, namely information disclosure, asymmetry theory and information transmission theory. Based on the actual situation, a detailed analysis of the Chinese enterprise Hengrui Pharmaceutical and the American enterprise Pfizer Pharmaceutical, the R&D expenditure and the disclosure of R&D expenses of the company in recent years were explained, and the problems and the gap between the two enterprises were found. Finally, suggestions for improvement are made for the above problems.
Research on the Mode and Optimization Path of Local Government Cooperative Governance in Sudden Public Crisis
Authors: Zeng Qing
Published: June 2023

This paper analyzes the problems in the governance of the novel coronavirus epidemic, and finds that there are still problems in collaborative governance, such as difficulties in inter-governmental coordination, lack of institutional guarantee, and insufficient role of social organizations. On this basis, this paper attempts to build a public crisis collaborative governance model, further explains the model, and puts forward specific action directions and countermeasures for the three types of subjects involved in this model, including government, social organizations and citizens, to participate in the public crisis collaborative governance.
Discussion on EVA Performance Evaluation Standard of Central Enterprise Based on WACC Valuation
Authors: Li Baoyan
Published: June 2023

Weighted average cost of capital (WACC) is a method of calculating a company's cost of capital by weighting the weight of each type of capital to the total source of capital.Economic Value Added (EVA) is the net operating profit after tax of an enterprise minus the opportunity cost of all invested capital including equity and debt. Given the "one-size-fits-all effect" of WACC in the evaluation of central enterprises' performance, this paper uses PetroChina as an example to verify whether there is an "inflated" or "overestimated" EVA in the evaluation of central enterprises' performance through the valuation of WACC. The results show that the relatively small WACC in EVA performance evaluation directly leads to the EVA overstatement of PetroChina. National industries are classified according to the competitiveness of industries in terms of economic value added creation and contribution. Replacing the current EVA evaluation criteria with EVA rate evaluation criteria or Delta EVA evaluation criteria is a more practical idea to solve the problem of "overstated" or "overestimated" national EVA.
Joint Decision-Making Model of Power Manufacturer Participation in Green Certificate Market and Medium - and Long-Term Power Market
Authors: Zhang Wenyu , Shen Yu , Xing Chen , Cai Hongfei , Xu Xiaochuan , Song Zhenyu , Zhang Zhenhao
Published: June 2023

To effectively guide power manufacturers in the medium and long-term market and green certificate market trading behavior. This paper firstly constructs the model of power manufacturers' participation in the green certificate market and the model of participating in the medium and long-term market of power, and establishes the coupling constraint of power manufacturers' participation in the power market and the green certificate market. Secondly, considering the speculative behavior of power manufacturers and using conditional value-at-risk to depict the profit risk of electricity generation due to the uncertainty of market price, the optimal comprehensive benefit considering the annual expected profit and risk of power manufacturers is taken as the decision-making objective, and the joint decision-making model of power manufacturers participating in the green certificate market and the medium and long term power market is established. It is helpful for power manufacturers to make trading decisions in medium and longterm market and green certificate market.
Sprunganalyse auf einer Kraftmessplatte – was sie
über die MS verrät
Authors: Geßner Anne , Stölzer-Hutsch Heidi , Trentzsch Katrin , Ziemssen Tjalf
Published: June 2023

Eines der am häufigsten beeinträchtigten Funktionssysteme bei
Multipler Sklerose (MS) ist die funktionelle Motorik. Bei detaillierter
Betrachtung hochkomplexer Bewegungen zeigen sich schon frühzeitig im
Erkrankungsverlauf unterschiedliche Defizite des neuromuskulären
Zusammenspiels. Daher widmet sich das Zentrum für klinische
Neurowissenschaften Dresden zur kinematischen und kinetischen Bewegungserfassung
neben einer multidimensionalen Gangbeurteilung einer Analyse verschiedener
Sprungvarianten bei Patienten mit Multipler Sklerose (PmMS).
Impact of Dietary Nitrate on the Recovery of Therapy-related Vascular Health Impairments Following Standard Periodontal Aftercare Therapy: a Hypothesis-generating
Subanalysis
Authors: Petersen Nicole , Schlagenhauf Ulrich , Jockel-Schneider Yvonne , Goßner Sophia K. , Stölzel Peggy , Haubitz Imme , Carle Reinhold , Baulmann Johannes
Published: June 2023

This follow-up study assessed the impact of a nitrate-rich diet on salivary nitrate/nitrite levels and the recovery of therapy-induced vascular impairments in a cohort of 39 periodontitis
patients treated by standard subgingival mechanical plaque removal (PMPR). At baseline, saliva samples for nitrate/nitrite analysis were collected, and peripheral/central blood and
augmentation pressure was documented using the Arteriograph recording system. Immediately after, PMPR vascular parameters were reassessed. All study patients received a randomly allocated
supply of a lettuce beverage to be consumed for 14 days, containing either a daily dosage of 200 mg nitrate (test group, n = 20) or being void of nitrate (placebo group, n = 19). At day 14,
salivary and vascular parameters were reassessed. Initial salivary and vascular parameters did not differ significantly between the groups. PMPR impaired all vascular parameters in both
groups with no differences between the groups. At day 14, salivary nitrate/nitrite levels of the test group were significantly elevated compared to baseline. All vascular parameters had
significantly recovered from the impairment inflicted by PMPR. In the placebo group, by contrast, salivary parameters did not differ significantly from baseline, and the recovery of impaired
vascular parameters was restricted to a significant improvement of diastolic blood pressure. Correlation analysis identified a significant inverse correlation between salivary
nitrate/nitrite sum and central/peripheral blood pressure and augmentation pressure. In conclusion, the data of this subanalysis suggest that increasing salivary nitrate/nitrite levels by a
diet rich in nitrate may improve recovery of therapy-induced vascular impairments after PMPR.
Stochastic dynamics of substrate non-uniform stiffness affecting molecular adhesion in cell–substrate interface subjected to tensile loading
Authors: Qi Chenwei , Zhang Juanjuan , Smith Ana-Sunčana , Li Long
Published: June 2023

The mechanically heterogeneous extracellular matrix (ECM) or tissues widely exist in biological systems and are capable of significantly regulating directional cell migration. However, prior to whole cell movement, how the cell senses these cues from mechanical heterogeneities of the ECM or substrate remains unclear at the molecular bond level. To address this issue, we theoretically investigate interface adhesion between a non-uniform stiffness substrate and a rigid plate via a series of receptor–ligand bonds subjected to a tensile loading by integrating substrate surface deformation described by continuum mechanics approach into the stochastic events of bond dissociation and association govern by Markov processes. Interestingly, it is found that, during stretching adhesion interface, due to the large collective contact forces near the stiff edge of the adhesion area, the crack first develops at this stiff edge and then grows to another relatively soft adhesion edge until the completed detachment achieved, which is distinct from the cracks growing from both two edges to center of adhesion area in the case of uniformly elastic solid–solid or solid–fluid interface. Moreover, the lifetime of the bond cluster, interface adhesion strength, and the effect of inter-bond distance are examined, respectively. The corresponding mechanism of dependence of the lifetime and adhesion strength on the non-uniform stiffness of the substrate and inter-bond distance is also analyzed. These findings provide a detailed mechanistic understanding of the adhesion interface responding to the mechanical heterogeneities of the substrate at the molecular bond level.
Improved flux-surface parameterization through constrained nonlinear optimization
Authors: Snoep G. , Koenders J. T. W. , Bourdelle C. , Citrin J. ,   JET Contributors
Published: June 2023

Parameterization of magnetic flux-surfaces is often used for magnetohydrodynamic stability analysis and microturbulence modeling in tokamaks. Shape parameters for such local parameterization of a (numerical) equilibrium are traditionally computed analytically using geometrically derived quantities. However, often the shape is approximated by the average of values for different sections of the flux-surface contour or a truncated series, which does not guarantee an optimal fit. Here, instead nonlinear least squares optimization is used to compute these parameters, with a weighted sum of squared error cost function that is robust to outliers. This method results in a lower total absolute error for both the parameterization of the flux-surface contour and the poloidal magnetic field density than current methods for several parameterizations based on the well-known “Miller geometry.” Furthermore, rapid convergence of shape parameters is achieved, no approximate geometric measurements of the contour are needed, and the method is applicable to any analytical shape parameterization. Validation with local, linear gyrokinetic simulations using these optimized shape parameters showed reduced root mean square errors in both the growth rate and frequency spectra when compared with simulations based on numerical equilibria. In particular, the popular Turnbull–Miller parameterization benefits from this approach, extending its usability closer toward the last-closed flux-surface for cases with minor up-down asymmetry.
Migration and heat transfer modeling of a neutrally buoyant melting particle in Poiseuille flow
Authors: Kaviani Reza , Naghashnejad Mohammad , Shabgard Hamidreza
Published: June 2023

A computational model is developed to simulate the hydrodynamic and heat transfer behavior of a melting cylindrical solid particle in plane Poiseuille flow between horizontal parallel plates. The two-dimensional transient conservation equations for mass, momentum, and energy are solved using a finite-volume scheme implemented on a deforming mesh, accounting for the rotation and non-uniform melting of the particle. An arbitrary Lagrangian–Eulerian (ALE) method is employed to directly track the moving and deforming solid–liquid interface during the particle migration and phase change. The developed model was validated by comparison with the previously reported numerical results for migration of a non-melting neutrally buoyant cylindrical particle in plane Poiseuille flow with heat transfer. The effects of flow Reynolds (Re), Grashof (Gr), and Stefan (Ste) numbers, as well as the initial position of the melting particle across the channel on the particle trajectory, melting rate, and average Nusselt (Nu) number were investigated. It was found that the melting rate increased by increasing Gr and Ste and decreased by increasing Re. The Nu did not change more than 20% with increasing Re number from 100 to 1000, but increased significantly by increasing Gr. It was also observed that by increasing Re, the particle migrates toward the channel center because of the stronger Magnus effect. Increasing Gr, on the other hand, pushes the particle to the bottom wall due to the stronger downward flow adjacent to the particle induced by buoyancy-driven convection (natural convection).
Numerical and artificial neural network analysis of an axisymmetric co-flow-focusing microfluidic droplet generator using active and passive control
Authors: Naji Sarvin , Rahimi Arvin , Bazargan Vahid , Marengo Marco
Published: June 2023

Droplet generation in microscale has gained enormous attention in recent years especially in the pharmaceutical industry due to their application in targeted drug delivery into droplets. In most of these applications, monodispersity and uniformity of droplets are essential. Microfluidic devices can generate droplets at high throughput, enabling thousands of droplet compound encapsulation per second. The monodispersity of the droplets is ensured hydrodynamically through the dripping regime and their uniformity is controlled by active and passive microflow control methods. Here, we study numerically a microfluidic chip that uses a non-embedded co-flow-focusing geometry, so that the droplet generation throughput can take advantage of the flow-focusing devices while the non-embedded co-flow geometry forecloses the surfactant addition necessity. The continuous and dispersed phases were light mineral oil and water, respectively. We investigated the formation of droplets and studied how changing the external diameter of the chip affects the transition between the dripping regime (which corresponds to monodispersity) and the jetting regime. The number of parameters to be taken into account for the optimization of the device is enormous; therefore, in order to account for the effect of many geometrical and hydrodynamical parameters, we trained an artificial neural network based on our simulation data. Using this neural network, we evaluated droplet formation in 3240 different cases. This approach resulted in a remarkable reduction of computation time, from months to seconds. Examining numerous cases in such a short period lets us choose the optimum geometry and flow rate based on the application. The optimization was able to find the best geometry to extend the region of dripping regime in the flow rate map. Finally, to harness the droplet generation frequency, we also simulated a periodically switched laser and we were able to predict the generation of droplets with the same frequency as the switching frequency. Therefore, altering and controlling the frequency and dimensions of the droplets for a given flow rate ratio could be achieved with this technique, even without satellite droplets.
A two-color dual-comb system for time-resolved measurements of ultrafast magnetization dynamics using triggerless asynchronous optical sampling
Authors: Nishikawa D. , Maezawa K. , Fujii S. , Okano M. , Watanabe S.
Published: June 2023

We report on an Er-doped fiber (EDF)-laser-based dual-comb system that allows us to perform triggerless asynchronous optical sampling pump–probe measurements of ultrafast demagnetization and spin precession in magnetic materials. Because the oscillation frequencies of the two frequency-comb light sources are highly stabilized, the pulse-to-pulse timing jitter is sufficiently suppressed, and data accumulation without any trigger signals is possible. To effectively induce spin precession in ferromagnetic thin films, the spectral bandwidth of the output of one of the EDF frequency comb sources is broadened by a highly nonlinear fiber and then amplified at a wavelength of about 1030 nm by a Yb-doped fiber amplifier. The output of the other frequency comb source is converted to about 775 nm by second harmonic generation. We used this system to observe ultrafast demagnetization and spin precession dynamics on the picosecond and nanosecond time scales in a permalloy thin film. This time-domain spectroscopy system is promising for the rapid characterization of spin-wave generation and propagation dynamics in magnetic materials.
Numerical study of transverse hydrogen injection in high-speed reacting crossflow
Authors: Rasheed Imran , Mishra Debi Prasad
Published: June 2023

A high-speed compressible solver capable of solving detailed chemical reaction mechanisms is developed by coupling the open-source computational fluid dynamic toolbox OpenFOAM® and Cantera 2.5.0. A sonic hydrogen jet discharging from a circular injector into a high enthalpy supersonic crossflow over a flat plate is selected as a test case for the developed solver. The incoming boundary layer is laminar, and an adverse pressure gradient-induced transition is expected due to transverse injection. The test case is selected to serve two purposes. First, to validate the developed solver. Second, to inspect the capability of Reynolds-Averaged Navier–Stokes (RANS) in predicting the flame characteristics in high-speed flows involving laminar to turbulent transition. The present study features three-dimensional RANS simulations with Shear Stress Transport (SST) k–ω and Langtry–Menter SST k–ω turbulence models, with three values of inlet turbulent intensity: I = 0.5, 1, and 2. Analysis showed that laminar to turbulent transition plays a significant role in the resulting flame structure. A fully turbulent SST k–ω model showed several discrepancies from the experiment, especially near the boundary layer. On the other hand, the Langtry–Menter SST k–ω model predicts transition onset and hence the flame structures accurately. Furthermore, the transition onset and the flame structure strongly depend on I. The low-velocity recirculation regions near the injector aid in flame stabilization upstream of the injector. At the same time, the horseshoe vortex dictates the flame spread in a spanwise direction. The reflected shock–boundary layer interaction helps in flame stabilization downstream of the injector.
Destabilizing effects of edge infernal components on resistive wall modes in advanced tokamak scenarios
Authors: Han Rui , Zhu Ping , Zheng Linjin
Published: June 2023

The stability of the n = 1 resistive wall modes (RWMs) dominated by the pressure-driven infernal components is investigated using the ideal magnetohydrodynamics (MHD) code AEGIS for the advanced tokamak scenarios. Here, n is the toroidal mode number. In the advanced tokamak scenarios, due to the large fraction of bootstrap current contribution, the profile of safety factor q is deeply reversed in magnetic shear in the central core region and locally flattened within the edge pedestal. Consequently, the pressure-driven infernal components develop in the corresponding flat-q regions of both core and edge. However, the edge infernal components dominate the n = 1 RWM structure and lead to lower βN limits for the advanced tokamak scenarios. In the framework of ideal MHD, the edge rotation is found the most critical to the stabilization due to the dominant influence of the edge infernal components, which should be maintained sufficiently large in magnitude and range in order for the rotation alone to fully suppress the n = 1 RWM in typical advanced tokamak scenarios.
Experimental and numerical investigation of a density-driven instability during a horizontal miscible displacement
Authors: Stergiou Yorgos , Papp Paszkál , Horváth Dezső , Tóth Ágota , Eckert Kerstin , Schwarzenberger Karin
Published: June 2023

We performed an experimental and numerical investigation of a convective buoyancy-driven instability that arises during the injection of a denser miscible fluid into a less dense one in a rectilinear geometry. We visualized the instability using a shadowgraph technique, and we obtained quantitative information using micro-Particle Image Velocimetry. Numerical simulations provided further insights into the three-dimensional (3D) velocity field. We have shown that the instability only occurs above a certain Péclet number, Pe, depending on the Rayleigh, Ra, and Schmidt, Sc, numbers. We suggest scalings of the critical time, TC, and dimensionless wavelength, λ/h, of the instability, both of which increase with increasing Pe and Ra. Finally, we investigated the interactions of the instability vortices with each other and the geometry boundaries.
Investigation of the molten droplet deposition offset based on the simple-component pseudopotential model
Authors: Ren Yanlin , Liu Zhaomiao , Gao Shanshan , Pang Yan
Published: June 2023

Metal droplet deposition manufacturing is an additive manufacturing technique that relies on the accurate prediction of deposition position, but is influenced by the wetting degree of solidified surface and the substrate. In this paper, a modified solid discriminant function is proposed for the simple-component pseudopotential model in the lattice Boltzmann method. The results show that the wetting degree of the substrate and the pre-solidified droplet causes the post-deposited droplet to deviate from the initial deposition distance Li* under interfacial tension, producing an offset δL*. However, the solidification effect inhibits spreading and rebound motion, thus changing the actual δL*. Under the solidification effect, different wetting degrees show that the horizontal deviation is more influenced by the pre-solidified droplet than the substrate and can be linearly predicted. The deposition can be divided into two stages depending on the attraction and repulsion motions of the droplets. In the attraction stage, the droplets form a three-phase contact line with the solidification surface, generating the pressure drop with the negative horizontal component under capillary expansion. In the repulsion stage, the second contact line is formed on the substrate, generating a smaller pressure drop in the horizontal direction. The essence of the difference effects of the two surfaces lies in the contacting duration and direction. Based on the principle of deposition deviation proposed in this paper, it will help to optimize the process parameters and improve the molding accuracy.
Electronic and magnetic properties of Lu and LuH2
Authors: Zhang Shunda , Bi Jiachang , Zhang Ruyi , Li Peiyi , Qi Fugang , Wei Zhiyang , Cao Yanwei
Published: June 2023

Clarifying the electronic and magnetic properties of lutetium, lutetium dihydride, and lutetium oxide is very helpful to understand the emergent phenomena in lutetium-based compounds (such as superconductivity-like transitions near room temperature). However, this kind of study is still scarce at present. Here, we report on the electronic and magnetic properties of lutetium metals, lutetium dihydride powders, and lutetium oxide powders. Crystal structures and chemical compositions of these samples were characterized by x-ray diffraction and x-ray photoemission spectroscopy, respectively. Electrical transport measurements show that the resistance of lutetium has a linear behavior depending on temperature, whereas the resistance of lutetium dihydride powders changes little with decreasing the temperature. More interestingly, paramagnetism-ferromagnetism-spin glass transitions were observed at near 240 and 200 K, respectively, in lutetium metals. To understand their origins, the measurement of inductively coupled plasma optical emission spectroscopy was performed, revealing that the concentrations of dilute magnetic impurities in lutetium and lutetium dihydride are around 0.01%, which can lead to the presence of spin glassy behavior. Our work uncovers the complex magnetic properties of lutetium and lutetium dihydride and suggests their close connections to the electronic and magnetic transitions of Lutetium-based compounds (such as Lu–H–N).
On-chip aberration correction for planar nanofocusing x-ray lenses by focused ion-beam milling
Authors: Seiboth Frank , Schropp Andreas , Lyubomirskiy Mikhail , Wang Wenxin , Jahn Andreas , Kulkarni Satishkumar , Keller Thomas F. , Schroer Christian G.
Published: June 2023

Aberration-free x-ray optics are a prerequisite for nondestructive scanning x-ray microscopy with highest spatial resolution in order to understand complex material systems and processes. Nevertheless, due to highly challenging manufacturing requirements, even state-of-the-art x-ray optics often still suffer from residual lens aberrations, and diffraction-limited performance can often only be achieved by inserting additional corrective optical elements. Here, the concept of tailor-made refractive x-ray phase plates is expanded by integrating these corrective optical elements into the focusing device directly. In this case, planar nanofocusing x-ray lenses out of silicon are corrected for aberrations by structuring the phase plate into the lens chip via focused ion-beam milling. The concept is demonstrated by focusing x-rays with an energy of 18 keV into a diffraction-limited focal spot with a size of 50×65 nm2 full-width at half-maximum and a reduction in residual intensity outside the focus by a factor of well over three.
Broad-spectrum and ultrasensitive photodetectors based on GeSe/SnS2 heterostructures with type-III band alignment
Authors: Yuan Le , Xu Zijie , Li Jiachen , Zhang Fen , Liu Shuo , Shi Hao , Xia Qinglin , Zhong Mianzeng
Published: June 2023

Two-dimensional (2D) van der Waals heterostructures (vdWHs) show great potential as building blocks for electronic and optoelectronic devices due to their unique band alignments at the contact interface, which can be tailored to achieve specific electronic and optical properties. The most studied 2D vdWHs have type-I and type-II band alignment, while for type-III band alignment vdWHs, carriers are transported through band-to-band tunneling, which have great potential for applications in low-power devices. Herein, we utilize the band structure alignment properties of GeSe and SnS2 to create GeSe/SnS2 vdWHs with type-III band alignment by all-dry transfer process. The GeSe/SnS2 vdWHs demonstrate an intriguing anti-ambipolar behavior attributed to their type-III alignment of electronic band structures. They also exhibit excellent photoresponse properties with broadband photoresponse from ultraviolet C (255 nm) to near-infrared (1920 nm), a competitive detectivity of 1.09 × 1010 Jones, a large responsivity of 50.7 A/W, and a response speed of 2.1 ms, which are superior to the pure GeSe (the spectral range of about 255–808 nm, the responsivity of 20.8 A/W, and τrise ≈ 20 ms), SnS2 (the spectral range of about 255–660 nm, the responsivity of 22 A/W, and τrise ≈ 50 ms), and the reported GeSe/SnS2 vdWHs.
Existential predication and have-possessive constructions in the languages of the world
Authors: Creissels Denis
Published: June 2023

The present article deals with the relationship between have-possessive constructions and inverse-locational predication, a type of construction commonly characterized as ‘existential’, illustrated by English There is a cat in the tree (contrasting with the plain-locational clause The cat is in the tree). Some of the languages that have a transitive ‘have’ verb use the same verb as an inverse-locational predicator. Two types of historical explanations can be considered: either the inverse-locational construction developed from the impersonalization of a pre-existing have-possessive construction, or the possessive construction initially belonged to the locational-possessive type, but has undergone changes making the coding of the possessor more similar to that of A in transitive clauses and/or the coding of the possessee more similar to that of P (have-drift).
Impersonal existence in the weather domain
Authors: Meulleman Machteld , Paykin Katia
Published: June 2023

This contribution examines the co-existence in French of two impersonal constructions with a light verb and a weather noun, as in il y a / il fait du vent ‘it’s windy’ (lit. there is / it makes wind). Our starting point stems from Bauer’s (2000) observations on Vulgar Latin postulating that facere ‘do, make’ with weather nouns appears to compensate for the diminishing use of intransitive weather verbs. Based on a diachronic and synchronic corpus study of weather sentences extracted from Frantext, we argue that Bauer’s hypothesis can apply at best to Middle French. For Modern and Contemporary French, our analysis reveals that both constructions are existential with il fait+N specializing in expressing ambient states and the il y a-construction in expressing atmospheric events or substances.
On a continuum from categorical to thetic judgment
Authors: Gécseg Zsuzsanna , Sarda Laure
Published: June 2023

This paper addresses the relationships between the existential reading of sentences with an indefinite subject and the presence of a spatial anchoring constituent. We investigated a corpus of French sentences with indefinite subjects in preverbal position and their translation into Hungarian. While French has a rather rigid word order, Hungarian is a discourse configurational language which signals the informational status of sentence constituents. Through the prism of differentiations made in the Hungarian translation, we distinguished two groups of indefinite subject sentences, one having a thetic interpretation, the other retaining a categorical – or categorical-like – interpretation despite the indefinite form of the subject. These sentences illustrate the fact that while indefinite NPs are known to be bad topics, they can nevertheless play this role to various degrees.
Calling long distance: Cell cycle–dependent Ca2+ flows connect stem cells across regeneration tissues
Authors: Goranci-Buzhala Gladiola , Niessen Carien M.
Published: June 2023

How adult stem cells signal in vivo over time to coordinate their fate and behavior across self-renewing tissues remains a challenging question. In this issue, Moore et al. (2023. J. Cell Biol.https://doi.org/10.1083/jcb.202302095) combine high-resolution live imaging in mice with machine learning tools to reveal temporally regulated tissue-scale patterns of Ca2+ signaling orchestrated by cycling basal stem cells of the skin epidermis.
Recurrent infection transiently expands human tissue T cells while maintaining long-term homeostasis
Authors: Davé Veronica , Richert-Spuhler Laura E. , Arkatkar Tanvi , Warrier Lakshmi , Pholsena Thepthara , Johnston Christine , Schiffer Joshua T. , Prlic Martin , Lund Jennifer M.
Published: June 2023

Chronic viral infections are known to lead to T cell exhaustion or dysfunction. However, it remains unclear if antigen exposure episodes from periodic viral reactivation, such as herpes simplex virus type-2 (HSV-2) recrudescence, are sufficient to induce T cell dysfunction, particularly in the context of a tissue-specific localized, rather than a systemic, infection. We designed and implemented a stringent clinical surveillance protocol to longitudinally track both viral shedding and in situ tissue immune responses in a cohort of HSV+ volunteers that agreed to avoid using anti-viral therapy for the course of this study. Comparing lesion to control skin biopsies, we found that tissue T cells expanded immediately after reactivation, and then returned numerically and phenotypically to steady state. T cell responses appeared to be driven at least in part by migration of circulating T cells to the infected tissue. Our data indicate that tissue T cells are stably maintained in response to HSV reactivation, resembling a series of acute recall responses.
Experimental and numerical simulation study on flow behavior of asphalt mixture using smart aggregate
Authors: Chen Feng , Wang Ning , Ma Tao
Published: June 2023

A meso-scale mechanical analysis approach, which is essentially based on the use of smart aggregate sensor, was employed to inquire the dynamic responses of smart aggregate in cold recycled asphalt mixtures during gyratory compaction, including as well an investigation over the critical influence factors. The discrete element method (DEM) was further applied to study the interaction behaviors of smart aggregate with the surrounding particles. The laboratory test results showed that smart aggregate is an effective method to monitor the contact force and rotation variation between the aggregates, and the changes in the mechanical and physical properties of the mixtures can be characterized by the monitoring results of smart aggregate. In addition, the results of DEM analyses show that the mixtures with 55% coarse aggregates have higher normal force and lower kinetic energy during gyratory compaction, revealing the influence mechanism of the effect of coarse aggregate content on smart aggregate monitoring results at the meso-scale.
Design of Visual Seismic Monitoring and Warning System Based on Zabbix
Authors: Chen Ling , Wang Xiaoming , Xue Ping , Zhang Yong , Gu Yueqi , Zhao Xuezhi , Cheng Xianzhou , Fan Mengyao , Xiao Shuang
Published: June 2023

With build a modern comprehensive seismic monitoring system in Shanghai as the research background, this paper used Grafana design to monitor alarm development. It based on Zabbix open-source system. The visual seismic monitoring and warning system is designed. System can send group call, WeCom and SMS alarm to the operation and maintenance personnel when the fault occurs. It provided detailed fault data. The system improved the capability of business system fault response and handling. It provided an important guarantee for the emergency command, seismometric operation and service period operation of Shanghai Seismic Agency.
Performance of Hollow Concrete Filled Circular Steel Tube Column Subjected Axial Loading
Authors: Ma Chuanzheng , Tan Yawen , Yang Zhijian , Han Jiaming
Published: June 2023

To improve the behavior of hollow concrete filled steel tube, a novel type of reinforced hollow concrete circular steel tubular member (RHCFST) was put forward and its axial behavior was studied. The finite element analysis model of 12 RHCFST short columns under axial compression was established by using ABAQUS. The influence of steel tube’s strength and wall thickness, diameter of steel bar with normal strength, sandwich concrete’s thickness and strength on the mechanical properties of members were investigated. The results showed that the loading process can be defined as five stages: elastic, elastoplastic, descending, strengthen and gentle stage. The new composite structure has good cooperative performance. The ultimate bearing capacity increaseswith the increase of yield strength and wall thickness of steel tube, thickness and strength of sandwich concrete and diameter of steel bar with normal strength.
Structure improvement and displacement calculation of the UHV bellows compensator
Authors: Li Qiu , Ma Zhicheng , Liu Yan , Li Zhuoliang , Cui Boyuan , Zhang Pengfei , Liu Gaofei , Wang Jun
Published: June 2023

Under the environment of large temperature differences, the Sichuan-Chongqing UHV project is located at the high-altitude area, and the universal bellows compensator which cannot meet the requirements of large displacement is prone to instability. This paper proposes the design scheme of modified pantograph linkages bellows compensator by studying the instability mechanism of the bellows and improving the structure of the compensator. The overall size is reduced, the stress and the deformation of the flange are decreased, and the stability of the compensators are enhanced. According to mechanics theories, the corresponding relationship among displacement, spring rate and the spring rate force was discovered. The equations of lateral displacement of bellows with high accuracy was established. And the final experimental displacements were obtained after two steps of calculating.
Case Calculation and Analysis of Insufficient Traction Force in Elevator
Authors: Ren Zhaolin
Published: June 2023

For the traction driven elevator, the satisfaction of traction conditions is the basic guarantee for the normal operation of the elevator. If the traction force is insufficient, there will be skid, slip and other phenomena, which not only cannot meet the design requirements of the elevator manufacturers, but also easy to cause safety accidents. The equivalent friction coefficient f (depending on groove shape, groove material and groove lubrication) and the wrap angle of the wire rope on the traction wheel play a decisive role in the traction force. Based on a case of insufficient traction force caused by too small Angle, the cause of its failure is calculated and analyzed, and corresponding corrective measures are put forward to avoid the occurrence of such problems.
Dynamic Response of Landscape Tower with Curved and Twisted Columns and Spiral Beams Based on Wind Tunnel Test
Authors: Liu Yongjie , Zhao Shuang , Yue Jiahao
Published: June 2023

The displacement and comfort of the tower top are important reference indexes for wind resistance design of the curved torsional column spiral beam landscape tower (LT). The dynamic response of tower top and platform is analyzed and discussed through wind tunnel test of aeroelastic model, and the influence of the tower itself on wind response and comfort of pedestrian is studied. The conclusion shows that the wind Angle has a great influence on the displacement of the top of the landscape tower, and the 150° wind Angle is the most unfavorable wind Angle of LT displacement. In addition, the peak acceleration of the platform reaches its maximum value at 90° wind Angle, resulting in poor lateral pedestrian comfort at high wind speed. It is suggested to restrict pedestrians from climbing the tower at high wind speed or to carry out vibration reduction research on such structures at high wind speed.