bluuebunny/crossref_metadata_2025 huggingface dataset:
The influence of cultural differences on marketing strategies of MNEs
Authors: Gao Ya
Published: April 2023

In the marketing of multinational enterprises, cultural differences have a complex impact on international marketing strategies. On one hand, taking advantage of cultural differences can diversify the corporate culture. On the other hand, cultural differences make management difficult, and there will be conflicts in mutual exchanges. This paper mainly summarizes the past literature, and connects the problems raised in some earlier studies and the situations solved in subsequent studies in series to make the logic chain more complete. At the same time, new problems are raised on this basis. After reviewing the literature, this work concludes that the multicultural environment is becoming more complex, and managers need to have a deeper understanding of different cultures while calculating the gains and losses, so as to integrate culture. Therefore, the research significance of this paper is to make a complete summary of the existing research results, sort out the unresolved problems, and provide ideas for subsequent related research.
Mechanism Design of China Ancillary Service Market Considering Provincial and Inter-Provincial Market Characteristics
Authors: Zhang Gao , Fan Menghua , lv Chen
Published: April 2023

With the future large-scale access of renewable energy, the electric power system will accelerate the development in the direction of clean and low carbon, especially under a high proportion of renewable energy electric power system, the structure and layout of China’s electric power production has been deeply adjusted. Thus, the balance situation of the power quantity is more complex, the risk of failure chain reaction caused by the simple accident increases greatly. Moreover, with the increase demand for flexible resources in power system, the importance of thermal power plant as well as ancillary service market is highlighted. Considering the difference between provincial and inter-provincial market, an overall mechanism design of China ancillary service market is put forward
The Impact of Live E-Commerce on College Students’ Consumption Perceptions and Behaviors
Authors: Qianyao Lin , Siyu Gan
Published: April 2023

In the Internet era, e-commerce live streaming as an emerging industry has gained a lot of traffic attention, and college students, as the main force of young people, have been affected by this upsurge. This paper uses empirical analysis to explore the influencing factors of e-commerce live streaming on the consumption concept and consumption behavior of college students, and explains it in detail.
Verify the Relationship Between a Company’s Earning per Share, Return on Equity, Return on Asset, Sales Growth, Price to Earning Ratio, Current Ratio, Gross Profit Margin, Quick Ratio, Asset Turnover and Its Stock Price
Authors: Mao Ruijie
Published: April 2023

The purpose of this study is to determine possible effect, which earning per share, return on equity, return on asset, sales growth, price to earning ratio, current ratio, gross profit margin, quick ratio, asset turnover can have on the stock price. The research involves 30 sample publicly listed company in 2017-2021, collecting data from balance sheet, financial statement, income statement and finbox website from 30 publicly listed companies and average stock price data from Macrotrends website. The result of this research is gained through multivariate regression, which shows that gross profit margin has significantly impact on stock price, and price to earning ratio has a significantly impact on stock price. Despite these three ratios, the other 6 ratios neither have degree of impacts significant enough to make a conclusion.
Influence of Internet Multi Culture on College Students’ Aesthetic Construction
Authors: Ma Zhichen
Published: April 2023

The ideological and political education of college students is critical to the physical and mental development of the young generation. It concerns social stability and the future of the country. Our college students’ aesthetic has been continuously changing and has been engraved with the brand of the times. With the on-going reform and opening up, information and cyber world has devel-oped vigorously, and the integration of Chinese and Western culture collision has been greatly increased. Foreign cultures are constantly entering the ideolo-gy of Chinese young groups, which, to a certain extent, leads to the current pat-tern of multi-cultural interference. Especially in the 21st century, with the in-ternet popularization worldwide, fragmentation, consumption and entertain-ment have become the common aesthetic characteristics of the times, and col-lege students’ aesthetic values have also been inevitably influenced, From the past to the present, college students’ aesthetic values from changed from mon-ism to pluralism, from absolute to relative, from “should” to “must”. Such a progress shows the result of the rapid development of China’s economy and so-ciety as well as the collision and comprehensive influence of domestic and for-eign economic, political, cultural and other factors.
Explore the Practical Path forward the Spirit of Nanniwan Farming for Self-reliance
Authors: Shi Xiaohua
Published: April 2023

The spirit of Nanniwan farming for self-reliance is one of the original ecology of Yan’an spirit, which is an important content of the spiritual pedigree of the Communist Party of China, and plays an important role in the process of China’s revolution, construction and reform in China. The spirit of Nanniwan is not only the spiritual support to realize national independence during the war years, but also the spiritual coordinates for the realization of Chinese Dream in the new era. Based on this, During the journey of realizing the great rejuvenation of the Chinese nation, we need to persist in the concept of reform and innovation, strengthen the method of combining theory and practice, with novel forms of publicity and education, Explore the practical path of carrying forward the spirit of Nanniwan actively. Connect with history, and continue to move forward, we should make unremitting efforts to achieve the socialist modernization and strengthen the country.
The impact of the coordinated development of Beijing-Tianjin-Hebei urban agglomeration on green total factor productivity--an empirical analysis based on the synthetic control method
Authors: Fei Kuang , Qian Yu , Yidong Qin
Published: April 2023

Based on the panel data of 92 prefecture-level cities in five major urban agglomerations from 2010 to 2019, and taking the 2015 Beijing-Tianjin-Hebei Coordinated Development Planning Outline as the quasi-natural experiment, evaluating the impact of the coordinated development of Beijing-Tianjin-Hebei on green total factor productivity by using synthetic control method. The study found that the coordinated development of Beijing-Tianjin-Hebei has a significant promoting effect on green total factor productivity; The policy effect of Beijing-Tianjin-Hebei coordinated development has regional differences in the time dimension. The coordinated development has a greater role in promoting non-core cities in the short term and a stronger role in promoting core cities in the long term; The mechanism test results show that the coordinated development of Beijing-Tianjin-Hebei mainly affects green total factor productivity through industrial structure upgrading and ecological environment protection.
A study on the public attention in the Belt and Road Initiative
Authors: Hu Liusho , Hu Jian , Wang Mingyu
Published: April 2023

This paper constructs residents’ attentiveness index of the Belt and Road Initiative by big data, and combines social and economic factors to study the spatial and temporal distribution of initiative attentiveness, we can find that (1) the attentiveness of the initiative will be greatly affected by large government conferences, and there is a mismatch between the areas covered by the initiative and the areas. (2) both per capita GDP and the proportion of fiscal investment in GDP have a significantly positive impact on the initiative attentiveness of residents, while CPI has a significantly negative Population size and unemployment rates do not have a significant impact on the initiative’s attentiveness. (3) the impact of initiative attentiveness has obvious regional differences. This paper breaks the habitual cognition of the attention of the initiative, and combines the social and economic conditions, and puts forward some suggestions, such as expanding the boundary of the Belt and Road, taking multiple measures to mobilize the social forces to build the Belt and Road, and treating the different policies.
Collaborative governance analysis of new rural credit system ba sed on evolutionary game
Authors: Li Min
Published: April 2023

Based on the logical framework of collaborative rural credit governance, this paper uses evolutionary game analysis to construct a tripartite evolutionary game model of collaborative governance in which grassroots government organizations lead, financial institutions collaborate, and farmers participate, analyzes the strategy choices of the three subjects in rural credit governance, and analyzes and studies the influencing factors of each subject’s strategy choices.
Acute Effects of kinesiotaping on Pain and Muscle Strength in
Individuals with Anterior Cruciate Ligament Tear
Authors: Kielė Dovilė , Solianik Rima
Published: April 2023

Objective Limited data are available regarding the effects of application
of kinesiology tape (KT) on pain and muscular strength in individuals with
complete anterior cruciate ligament (ACL) tear. Thus, we aimed to evaluate the
short-term effects of KT on knee pain and maximal strength.

Materials and Methods 25 subjects were divided into two groups: a) the
control group participants (n=11) were without ACL-tear; and b) the
experimental group participants (n=14) were with ACL-tear. Participants
in the experimental group were tested under two conditions: with and without KT.
Pain was recorded using the visual analog scale, isometric and concentric
maximal voluntary contractions (MVCs) were measured using dynamometry, and limb
symmetry index was calculated.

Results Application of KT causes reduction in pain by 50 %
(p<0.05), increases knee flexors and knee extensors isometric MVC and
knee extensor concentric MVC at 60°/s angular velocity
(p<0.05), and improves limb symmetry (p<0.05), but deficit of
MVC as compared to healthy controls is maintained (p<0.05).

Conclusions Short-term KT can be an effective tool for decreasing ACL-tear
associated pain and muscle weakness.
Fünf juristische Fallstricke bei der Aufklärung
über die Behandlungsalternative „Sectio“
Authors: Brocks Johannes
Published: April 2023

Schadensersatzansprüche können sich im Geburtsschadensrecht
bekanntermaßen nicht nur aus Behandlungsfehlern, sondern auch aus einer
fehlerhaften Aufklärung der Schwangeren ergeben. Der Vorwurf, dass
nicht, nicht ausreichend oder nicht rechtzeitig über die
Möglichkeit einer Sectio aufgeklärt wurde, spielt dabei eine
wichtige Rolle. Der Vorwurf ist praktisch bedeutsam, weil er in
geburtsschadensrechtlichen Auseinandersetzungen sehr häufig erhoben wird
und nicht selten auch Erfolg hat. Dabei tauchen in der Praxis immer wieder
dieselben Aufklärungsfehler auf, die zur Haftung führen
können.
Mental Wellbeing among Children with Cancer during COVID-19 Pandemic in Indonesia: A Cross-sectional Study
Authors: Sari Teny Tjitra , Wiguna Tjhin , Elvira Sylvia Detri , Widyahening Indah Suci , Mangiri Rinoldy , Napitupulu Apul S. , Sutandi Nathania , Tanumiharjo Silvia , Sitorus R S.
Published: April 2023

Introduction Coronavirus disease 2019 (COVID-19) has affected both physical and mental aspect of people worldwide, especially the high-risk group such as pediatric cancer patients. Children with cancer were considered both clinically and mentally vulnerable during this pandemic. They were also affected by the self-isolation, quarantine, and social distancing policy taken as a respond to public threat.

Objectives To evaluate the impact of social distancing and health protocol during COVID-19 on the mental health profile of children with cancer in Indonesia.

Materials and Methods A cross-sectional study evaluating the mental health of children with cancer during COVID-19 pandemic was conducted in Cipto Mangunkusumo Hospital, Jakarta, Indonesia from June to September 2020. An online questionnaire was used to collect demographics of parents and children, children's Strength and Difficulties Questionnaire (SDQ) score, and parents' Self-Reporting Questionnaire (SRQ). SDQ score consists of five subscales, including the emotional symptoms, conduct problems, hyperactivity, peer relationships problems and prosocial behavior. Cancer types were grouped into retinoblastoma, nonretinoblastoma (other solid tumors), and leukemia.

Results There were 156 valid responses, consisting of 42 patients with retinoblastoma, 34 patients with nonretinoblastoma (other solid tumors), and 80 patients with leukemia. Pandemic-related lifestyle changes did not significantly impact emotional or behavioral problems. Children with normal total SDQ (odds ratio [OR]: 473, p = 0.001) and emotional scores (OR: 3.19, p = 0.07) had parents with normal SRQ scores (<6). Leukemia patients with shorter diagnosis period had worse hyperactivity score (p = 0.01). On the contrary, leukemia inpatients had better prosocial scores than outpatients (p = 0.03). More bilateral retinoblastoma patients (p = 0.04) with longer duration of cancer diagnosis (p = 0.03) faced peer problems.

Conclusions Our study revealed that lifestyle changes during early COVID-19 pandemic were not major factors impacting emotional and behavioral problems in children with cancer. However, disease-related factors pose great challenges; thus, a holistic mental health support system should be available to both children and parents.
Outcome and Complications following Stabilization of Coxofemoral Luxations in Cats Using a Modified Hip Toggle Stabilization—A Retrospective Multicentre Study
Authors: Knell Sebastian Christoph , Longo Federico , Wolfer Nadja , Schmierer Philipp A. , Hermann Andreas , Pozzi Antonio
Published: April 2023

Objectives The main aim of this study was to report the surgical technique, the complications and the clinical outcomes of the mini-Tight Rope system (mini-TR) for a modified hip toggle stabilization of coxofemoral luxation in cats.

Study Design A multicentre retrospective study.

Animals Thirty-two client-owned cats.

Methods Medical records (2009–2017) of cats, which underwent stabilization of a coxofemoral luxation with the mini-TR and had at least a 3-month follow-up, were reviewed. The femoral tunnel diameter, the use of one or two FiberWire loops, perioperative complications and clinical outcomes were recorded. Follow-up information was obtained through clinical and radiographic examinations and an owner questionnaire.

Results Thirty-two cats met the inclusion criteria. Concurrent injuries were present in 16 cats. A single or double loop mini-TR was used in 21 and 12 cats respectively. One double loop (1/12 cats) and four single loop (4/16 cats) sutures failed. Moderate-to-severe coxofemoral osteoarthritis developed in 14/27 cats. Owner questionnaires revealed excellent clinical outcomes.

Clinical Significance Mini-TR with a double-stranded implant is recommended to decrease the risk of suture failure. Osteoarthritis is common after open reduction of hip luxations.
Sellar-Parasellar and Petrous Bone Metastasis from Differentiated Thyroid Carcinoma: Imaging Characteristics and Follow-Up Profile Post Radioiodine Therapy
Authors: Sonavane Sunita Nitin , Upadhye Trupti , Basu Sandip
Published: April 2023

Sella turcica and petrous bone metastasis from differentiated thyroid carcinoma are rare clinical entities, with only a few limited cases reported to date. Two cases, one of sella turcica metastasis and the other of petrous bone metastasis from carcinoma of the thyroid gland, are presented. The cases diagnosed to have arisen from poorly differentiated thyroid carcinoma and follicular carcinoma of thyroid, respectively, subsequently underwent total thyroidectomy, radioiodine (RAI) scans and RAI therapies with iodine-131, external radiotherapy, and levothyroxine suppression with follow-up. Their clinical symptoms gradually subsided, with reduction in serum thyroglobulin, and finally resulted in disease stabilization. With the multimodality therapeutic approach, both patients are alive to date, with 48- and 60-month survival post diagnosis, respectively.
Broadband tuning of plasma photonic crystal bandgaps using pixilated plasma distributions within a supercell
Authors: Paliwoda Matthew C. , Rovey Joshua L.
Published: April 2023

Plasma photonic crystals (PPCs) are photonic crystals formed from plasma that allows them an electrically tunable structure and permittivity. PPCs are potential microwave bandgap components with frequency ranges theoretically limited only by the physical control of the plasma distribution. In practice, they are limited by the controllability of the plasma distribution. Traditional approaches have minimal control and range of PPC reconfigurability because the plasma distribution is fixed. In contrast, this work explores reconfiguring the PPC structure by treating individual columns as pixels within a larger PPC structure. While the location of each plasma column is fixed, individual columns are adjusted to change the macroscopic plasma distribution of the total PPC. This work shows for the first time that individual plasma column control can tune a PPC bandgap frequency by an order of magnitude, from 190–300 GHz to 26–37 GHz. The changes to the larger supercell structure emulate changes to PPC parameters such as the lattice constant, column radius, and permittivity. This enables a wider tunable frequency range for PPC bandgaps as well as improved manipulation over the range. The collision frequency imposes a lower limit on the variable frequency range. The results demonstrate an expanded frequency variability for PPCs that highlight their potential as a wideband tunable bandgap device when each column is individually controlled.
A roadmap for developing and engineering in vitro pulmonary fibrosis models
Authors: Dabaghi Mohammadhossein , Carpio Mabel Barreiro , Saraei Neda , Moran-Mirabal Jose Manuel , Kolb Martin R. , Hirota Jeremy A.
Published: April 2023

Idiopathic pulmonary fibrosis (IPF) is a severe form of pulmonary fibrosis. IPF is a fatal disease with no cure and is challenging to diagnose. Unfortunately, due to the elusive etiology of IPF and a late diagnosis, there are no cures for IPF. Two FDA-approved drugs for IPF, nintedanib and pirfenidone, slow the progression of the disease, yet fail to cure or reverse it. Furthermore, most animal models have been unable to completely recapitulate the physiology of human IPF, resulting in the failure of many drug candidates in preclinical studies. In the last few decades, the development of new IPF drugs focused on changes at the cellular level, as it was believed that the cells were the main players in IPF development and progression. However, recent studies have shed light on the critical role of the extracellular matrix (ECM) in IPF development, where the ECM communicates with cells and initiates a positive feedback loop to promote fibrotic processes. Stemming from this shift in the understanding of fibrosis, there is a need to develop in vitro model systems that mimic the human lung microenvironment to better understand how biochemical and biomechanical cues drive fibrotic processes in IPF. However, current in vitro cell culture platforms, which may include substrates with different stiffness or natural hydrogels, have shortcomings in recapitulating the complexity of fibrosis. This review aims to draw a roadmap for developing advanced in vitro pulmonary fibrosis models, which can be leveraged to understand better different mechanisms involved in IPF and develop drug candidates with improved efficacy. We begin with a brief overview defining pulmonary fibrosis and highlight the importance of ECM components in the disease progression. We focus on fibroblasts and myofibroblasts in the context of ECM biology and fibrotic processes, as most conventional advanced in vitro models of pulmonary fibrosis use these cell types. We transition to discussing the parameters of the 3D microenvironment that are relevant in pulmonary fibrosis progression. Finally, the review ends by summarizing the state of the art in the field and future directions.
Use of a plasma focus device to study pulsed x-ray effects on peripheral blood lymphocytes: Analysis of chromosome aberrations
Authors: Verdejo Valentina , Radl Analía , Barquinero Joan-Francesc , Jain Jalaj , Davis Sergio , Pavez Cristian , Soto Leopoldo , Moreno José
Published: April 2023

X-ray pulses (full width at half maximum ∼ 90 ns, dose rate ∼ 107 Gy s−1) were used to irradiate the monolayer of peripheral blood mononucleated cells using the PF-2kJ kilojoule plasma focus device. Four different exposure conditions were evaluated using 5, 10, 20, and 40 pulses, with the mean dose measured by TLD-100 being 0.12 ± 0.02 mGy, 0.14 ± 0.03 mGy, 0.22 ± 0.06 mGy, and 0.47 ± 0.09 mGy, respectively. Cytogenetic analysis showed an increase in all types of chromosomal aberrations following exposure to x-ray pulses. The distribution of dicentrics and centric rings was overdispersed after 5, 10, 20, and 40 pulses. Additionally, after 20 and 40 pulses, the presence of tricentric chromosomes is detected. Chromosome aberration frequencies found in this study were always higher than the estimated frequencies of chromosome aberrations using published dose–effect curves for conventional radiation sources. The overdispersion observed, the elevated maximum relative biological effectiveness (RBEM) and the presence of tricentric chromosomes at the relatively low doses of exposure (<0.5 Gy) seem to indicate that low doses of pulsed x-rays of low energy show similar biological effects as those observed for high-LET radiation. X-ray pulses emitted by PF-2kJ were found to be more efficient in inducing chromosome aberrations, even more than α particles.
Scale-by-scale analysis of interscale scalar transfer in grid turbulence with mean scalar gradient
Authors: Wang Muyang , Yurikusa Takuya , Iwano Koji , Sakai Yasuhiko , Ito Yasumasa , Zhou Yi , Hattori Yuji
Published: April 2023

Direct numerical simulations were carried out on grid turbulence with a mean scalar gradient to reveal interscale scalar transport. Two-point statistical analysis using the structure function and the scale-by-scale scalar equation was performed. Results show that the third-order structure function becomes negative at large scales in the upstream region (inverse cascade occurs), while such distributions do not appear for turbulence energy. This phenomenon in scalars gradually disappears in the downstream region. Budget analysis of the structure function reveals that this is mainly caused by the non-linear scalar transfer term in the direction of the mean scalar gradient (vertical direction here). When the separation distance is smaller than Taylor's microscale, where the interscale scalar transfer is normal (large to small scales), the direction of the scalar flux is determined by the vertical velocity fluctuation difference between two points. However, when separation is larger than Taylor's microscale and inverse cascading occurs, the direction is determined by derivative of the scalar fluctuation rather than the velocity fluctuation difference. Further analysis reveals that the existence of fluid mass with an unmixed scalar plays an important role in the inverse cascade phenomenon.
WaveTrain: A Python package for numerical quantum mechanics of chain-like systems based on tensor trains
Authors: Riedel Jerome , Gelß Patrick , Klein Rupert , Schmidt Burkhard
Published: April 2023

WaveTrain is an open-source software for numerical simulations of chain-like quantum systems with nearest-neighbor (NN) interactions only. The Python package is centered around tensor train (TT, or matrix product) format representations of Hamiltonian operators and (stationary or time-evolving) state vectors. It builds on the Python tensor train toolbox Scikit_tt, which provides efficient construction methods and storage schemes for the TT format. Its solvers for eigenvalue problems and linear differential equations are used in WaveTrain for the time-independent and time-dependent Schrödinger equations, respectively. Employing efficient decompositions to construct low-rank representations, the tensor-train ranks of state vectors are often found to depend only marginally on the chain length N. This results in the computational effort growing only slightly more than linearly with N, thus mitigating the curse of dimensionality. As a complement to the classes for full quantum mechanics, WaveTrain also contains classes for fully classical and mixed quantum–classical (Ehrenfest or mean field) dynamics of bipartite systems. The graphical capabilities allow visualization of quantum dynamics “on the fly,” with a choice of several different representations based on reduced density matrices. Even though developed for treating quasi-one-dimensional excitonic energy transport in molecular solids or conjugated organic polymers, including coupling to phonons, WaveTrain can be used for any kind of chain-like quantum systems, with or without periodic boundary conditions and with NN interactions only. The present work describes version 1.0 of our WaveTrain software, based on version 1.2 of scikit_tt, both of which are freely available from the GitHub platform where they will also be further developed. Moreover, WaveTrain is mirrored at SourceForge, within the framework of the WavePacket project for numerical quantum dynamics. Worked-out demonstration examples with complete input and output, including animated graphics, are available.
Bubble floatation, burst, drainage, and droplet release characteristics on a free surface: A review
Authors: Gupta Sanjeev
Published: April 2023

The phenomenon of a bubble bursting to generate droplets exists in industrial and environmental systems and has a subtle impact on our daily lives. A bubble generated by gas injection or heating rises to the free surface and undergoes floating, drainage, and eventually bursting processes to produce film and jet droplets. The interrelated processes make it difficult to understand the characteristics of a bubble burst. Thus, a summary of the individual stages of a single bubble from generation to burst is necessary. First, we describe the calculation method and simple expressions for the shape of a bubble floating on a free surface. Next, we discuss the bubble drainage model and its influencing factors as this directly determines the time evolution of the film thickness. As an essential factor that affects the film thickness, the bubble drainage time is defined as the bubble lifetime. We compare the bubble lifetime distributions in the published literature and explore the associated influencing factors. Then, we investigate the bubble bursting dynamics and focus on the bubble film opening process once a hole appears on its surface. As a legacy of bubble burst, we explore the production process, size, and number of film and jet droplets. Finally, we discuss the enrichment phenomenon and the enrichment factors of film and jet droplets when releasing particles entrained by droplets. This review considers a series of processes for bubble burst to generate droplets and concentrates on the mechanism and experimental correlations with a summary and future prospects.
A theoretical investigation of magnetic susceptibility measurement of diamagnetic liquids using a Michelson interferometer
Authors: Shulman David
Published: April 2023

In this paper, we investigate the potential of using a Michelson interferometer to measure the magnetic susceptibility of liquids. The theoretical basis for this measurement technique is presented, including the relevant equations and models used to analyze the data. The proposed method involves using a ring magnet to deform the liquid and passing a laser beam through the liquid to measure the resulting interference pattern using the interferometer. The deformation of the liquid caused by the known magnetic field of the ring magnet can be used to calculate the magnetic susceptibility of the liquid. The feasibility and potential advantages of this method are discussed, including the possibility of high-precision measurements and the applicability of the technique to various fields.
Fast and reliable prediction of scramjet flowfields via Gaussian process latent variable model and deep learning
Authors: Fujio Chihiro , Akiyama Kento , Ogawa Hideaki
Published: April 2023

Fast and accurate prediction of high-speed flowfields is of particular interest to researchers in fluid science and engineering to enable efficient design exploration and knowledge discovery. The reliability of prediction is another important metric for the performance of prediction models. While predictive modeling approaches with and without reduced-order modeling (ROM) via machine learning techniques have been proposed, they are inherently subject to loss of information for ROM-based approaches and substantial computational costs in modeling for non-ROM-based approaches. This paper proposes an accurate ROM-based predictive framework with minimum information loss enabled by incorporating Gaussian process latent variable modeling (GPLVM) and deep learning. The stochastic nature of GPLVM allows for uncertainty quantification that indicates the degree of prediction error or reliability of prediction without requiring validation data. The applicability for supersonic/hypersonic viscous flowfields has been examined for two cases including axisymmetric intakes and two-dimensional fuel injection in scramjet engines by comparison with other predictive models. Comparable or superior prediction accuracy over the other models has been achieved by the proposed approaches, demonstrating its high potential to serve as a new competent, data-driven technique for fast, accurate, and reliable prediction of scramjet flowfields.
Qubit geodesics on the Bloch sphere from optimal-speed Hamiltonian evolutions
Authors: Cafaro Carlo , Alsing Paul M
Published: April 2023

In the geometry of quantum evolutions, a geodesic path is viewed as a path of minimal statistical length connecting two pure quantum states along which the maximal number of statistically distinguishable states is minimum. In this paper, we present an explicit geodesic analysis of the dynamical trajectories that emerge from the quantum evolution of a single-qubit quantum state. The evolution is governed by an Hermitian Hamiltonian operator that achieves the fastest possible unitary evolution between given initial and final pure states. Furthermore, in addition to viewing geodesics in ray space as paths of minimal length, we also verify the geodesicity of paths in terms of unit geometric efficiency and vanishing geometric phase. Finally, based on our analysis, we briefly address the main hurdles in moving to the geometry of quantum evolutions for open quantum systems in mixed quantum states.
GNSS integrity risk evaluation in the position domain based on the generalized Pareto distribution
Authors: Li Liang , Li Ruijie , Wang Liuqi , Wang Renlong , Li Menghao , Li Min
Published: April 2023

Integrity monitoring of global navigation satellite systems (GNSSs) is designed to protect against extremely rare hazardous events, characterized by an integrity risk with a very low probability. The traditional integrity risk evaluation is restricted simultaneously by non-Gaussian measurement errors and impractical time consumption. Based on extreme value theory, a generalized Pareto distribution (GPD)-based integrity risk evaluation method in the position domain is proposed to estimate the upper bound of the integrity risk. In order to account for the GPD modeling error and estimation error, conservatism of the proposed GPD-based integrity risk evaluation is obtained by imposing model-driven and data-driven overbounding. Simulation results from four typical heavy-tailed distributions have shown that conservative and tight bound integrity risk results can be achieved. Furthermore, real-world European Geostationary Navigation Overlay Service measurements experiment has shown that the integrity risk evaluation resulting from the proposed method is at least one order less than the traditional evaluation method, which is consistent with official publications.
Stacking and freestanding borophene for lithium-ion battery application
Authors: Shao Wei , Hou Chuang , Wu Zenghui , Zhang Pengyu , Tai Guoan
Published: April 2023

The growth of artificial synthesis two-dimensional (2D) materials usually demands for suitable substrate due to their rare bulk allotropies. Borophene, as a typical artificial synthetic material, has been proved its substrate-growth on metal or nonmetals and its high theoretical specific capacity (1720 mAh g−1) for next-genatration electrode material, but structural instability and transfer difficulties have hindered the development of its applications. Here, a structurally stable and freestanding AA-stacked-α′-4H-borophene sheets have been synthesized by in situ lithium eutectic salt-assisted synthetic method to realize the application of borophene in lithium-ion battery. The atomic structure of AA-α′-4H-borophene with interlayer VdWs was established by comparing the experimental observation with DFT optimal calculation. Different stacking configurations (AA- and AB-) of borophene was realized by a temperature-structure-photoluminescence intensity relationship, and the AA-stacked borophene exhibits higher specific capacity than AB structure. Based on electrochemical performance, the AA-borophene exhibits excellent rate capability and cycling performance due to its non-collapsible stacking configurations, which dominates great initial coulombic efficiency of 87.3% at 200 mA g−1 superior to that of black phosphorus-based and borophene/graphene. Meanwhile, it still maintains the coulombic efficiency of 99.13% after 1000 cycles. It also shows a reversible capacity of 181 mAh g−1 at 10 mA g−1 between the voltage window of 0.01 and 2 V, which improves the reported capacity (43 mAh g−1) of bulk boron anode by over 430%. This work brings fantastic new view of fabricating stable, stacking and freestanding borophene and provides a significative idea on applications of borophene in energy storage domain.
ZnS spheres assembled from nanoparticles confined in bagasse-based carbon nanosheets for enhanced potassium storage
Authors: Wang Lili , Chen Rui , Liang Xin , Hu Lei , Deng Chonghai , Liang Dewei , Liang Sheng , Liu Linli
Published: April 2023

Transition metal zinc sulfide (ZnS) is a promising anode material for potassium ion batteries due to its rich abundance and high capacity (conversion/alloy dual mechanism), while still suffering the drawbacks of sluggish kinetics process and structural degradation, which restrict its practical application. Herein, ZnS spheres assembled from nanoparticles embedded in carbon nanosheets (ZnS/C@C) were synthesized with alkali-activated agricultural waste bagasse as the carbon precursor. The removal of lignin and hemicellulose by pre-treatment of bagasse with alkali solutions opens ionic diffusion channels and promotes adsorption of Zn2+ by bagasse, which is crucial for the growth of ZnS in bagasse sheets and the suppression of ZnS particle size during hydrothermal processes. Benefiting from the synergistic effects between robust embedded structure, carbon conductive network and the nanoscale nature of ZnS, the ZnS/C@C exhibited enhanced performance with high capacity (374.7 mA h g−1 at 0.2 A g−1) and rate performance (195.9 mA h g−1 at 2.0 A g−1). Kinetic studies further demonstrate that ZnS/C@C electrodes possess faster K+ transport kinetics and lower interfacial impedance. This work provides a reference for the construction of robust embedded carbon composite structures based on surface control of agricultural waste.
The growth of periodic orbits with large support
Authors: Hou Xiaobo , Tian Xueting , Yuan Yi
Published: April 2023

In this paper, we study the role of periodic measures with large support in the sense of density in invariant measures and the exponential growth for systems with periodic shadowing property or periodic approximate product property. These results are more refined versions of the Sigmund’s density result of periodic measures and Bowen’s entropy formula between the growth of periodic measures and entropy. Furthermore, we provide an abstract framework such that the results also hold for general homoclinic classes and shifts with non-uniform structure.
Direct Optimization of Fast-Ion Confinement in Stellarators
Authors: Bindel David , Landreman Matt , Padidar Misha
Published: April 2023

Confining energetic ions such as alpha particles is a prime concern in the design of stellarators. However, directly measuring alpha confinement through numerical simulation of guiding-center trajectories has been considered to be too computationally expensive and noisy to include in the design loop, and instead has been most often used only as a tool to assess stellarator designs post hoc. In its place, proxy metrics, simplified measures of confinement, have often been used to design configurations because they are computationally more tractable and have been shown to be effective. Despite the success of proxies, their correlation with direct trajectory calculations is known to be imperfect. In this study, we optimize stellarator designs for improved alpha particle confinement without the use of proxy metrics. In particular, we numerically optimize an objective function that measures alpha particle losses by simulating alpha particle trajectories. While this method is computationally expensive, we find that it can be used successfully to generate configurations with low losses.
High optoelectronic quality of AZO films grown by RF-magnetron sputtering for organic electronics applications
Authors: Silva Hálice de Oliveira Xavier , Faraco Thales Alves , Maciel Indhira Oliveira , Quirino Welber Gianini , Fragneaud Benjamin , Pereira Paula Gomes , Legnani Cristiano
Published: April 2023

Aluminum-doped zinc oxide thin films, known by the acronym AZO, were grown by radio-frequency magnetron sputtering method (rf-magnetron sputtering) onto glass substrate at room temperature and without posterior heat treatment. The impact on the structural, electrical, and optical properties of the AZO films was studied as a function of the following deposition parameters: working pressure, rf-power and thickness. Our films showed low electrical resistivity and high transmittance in the visible region comparable to commercial indium tin oxide (ITO) films. We obtained an optimized AZO film with an electrical resistivity of 4.90 × 10−4 Ωcm and presented optical transmittance strikingly high for such a good conductor, with about 98% at 580 nm and an average optical transmittance of about 92% in the visible region. We also built and characterized an organic light-emitting diode (OLED) using the optimized AZO film as a transparent electrode. The AZO-based OLED showed characteristics comparable to a reference ITO-based device, indicating that AZO films have optoelectronic properties good enough to be used in organic electronics. In addition, the results suggest that they are suitable to be employed as transparent conductors in flexible polymeric substrates since their synthesis was performed without intentional heating.
Systematic study of tunable laser cooling for trapped-ion experiments
Authors: Kulosa A P , Prudnikov O N , Vadlejch D , Fürst H A , Kirpichnikova A A , Taichenachev A V , Yudin V I , Mehlstäubler T E
Published: April 2023

We report on a comparative analysis of quenched sideband cooling in trapped ions. We introduce a theoretical approach for time-efficient simulation of the temporal cooling characteristics and derive the optimal conditions providing fast laser cooling into the ion’s motional ground state. The simulations were experimentally benchmarked with a single 172Yb+ ion confined in a linear Paul trap. Sideband cooling was carried out on a narrow quadrupole transition, enhanced with an additional clear-out laser for controlling the effective linewidth of the cooling transition. Quench cooling was thus for the first time studied in the resolved sideband, intermediate and semi-classical regime. We discuss the non-thermal distribution of Fock states during laser cooling and reveal its impact on time dilation shifts in optical atomic clocks.
Dynamical friction due to fuzzy dark matter on satellites described by axisymmetric logarithmic potentials
Authors: Vitsos Andreas , Gourgouliatos Konstantinos N.
Published: April 2023

A plausible dark matter candidate is an ultralight bosonic particle referred to as fuzzy dark matter. The equivalent mass-energy of the fuzzy dark matter boson is ∼ 10-22 eV and has a corresponding de Broglie wavelength of kiloparsec scale, thus exhibiting wave behaviour in scales comparable to a galactic core, which could not appear in conventional cold dark matter models. The presence of fuzzy dark matter in galactic clusters will impact the motion of their members through dynamical friction. In this work, we present simulations of the dynamical friction on satellites traversing an initially uniform fuzzy dark matter halo. We focus on the satellites whose shapes are beyond spherical symmetry described by ellipsoidal and logarithmic potentials. We find that the wakes created on the fuzzy dark matter halo due to the passage of such satellites are qualitatively different from those generated by spherically symmetric ones. Furthermore, we quantify the dynamical friction coefficient for such systems, finding that the same satellite may experience a drag differing by a factor of 5 depending on its ellipticity and the direction of motion. Finally, we find that the dynamical friction time-scale is close to Hubble time, assuming a satellite of 1011
M
⊙ traversing at 103 km/s a FDM halo whose mean density is ∼ 106
M
⊙ kpc-3.
Large Telescope Wind Load Estimation with Gradient Segments Superposition and its Servo Control
Authors: Yu Jia-Heng , Xue Song , Luan Tian , Wang Long-Yang , Lian Pei-Yuan , Yan Yue-Fei , Kong De-Qing , Zhao Wu-Lin , Xu Qian , Wang Cong-Si
Published: April 2023

Obtaining the wind load distribution on the telescope aperture is very important to estimate its influence and reduce the wind disturbance on the telescope system. The aperture of the radio telescope structure can be as large as 100 m and therefore, the uniform wind load on the aperture assumption is not suitable for the radio telescope with large aperture. In this paper, a gradient segments superposition method for calculating the wind load has been proposed. The proposed method has been constructed by combining two regional divisions. First, reflecting surface has been evenly divided in the altitudinal direction. Second, the reflecting surface has been divided into several uniform rings assuming that the wind load coefficient on different rings are different. For the 110 m aperture radio telescope, the wind load estimation results differ by 28%. After that, a structural dynamics model of telescope has been established and a fuzzy PID controller has been designed to reduce wind disturbance. The Root Mean Square Error of telescope pointing under wind disturbance has been reduced by 67.8%. It is suggested that the proposed wind load estimation method has lay a solid foundation for the design of the large telescope system under wind disturbance.
A novel method to pack cryopreserved amniotic membrane for wound dressing—the pathway through validation of a new biological product
Authors: Ogliari Karolyn Sassi , Grudzinski Patrícia Bencke , da Silva Camila Gomes , Immig Mônica Luiza , Halon Maria Laura , Loth Fabrízio Blank , Ogliari Alicia Sassi , Tovo Monique Blauth , Beckenkamp Liziane Raquel
Published: April 2023

Amniotic membrane (AM) has been widely used as a biological dressing for many pathologies and illnesses worldwide, and products derived from this tissue have been commercially available in several countries. In Brazil, regulatory agencies have recently authorized its clinical use as a non-experimental therapy for burns, diabetic and venous stasis ulcers, and intrauterine adhesions. In this study, we present our pathway through validating the first available service in the country of AM cryopreservation, with a protocol for long-term storage in high-efficiency nitrogen cryogenic freezers and a specific way of packing the tissue for optimal clinical handling and efficient storage space utilization while preserving live cells and the tissue’s biological properties. Using gauze as support, cryoprotectant dimethyl sulfoxide and product presentation as a multilayer roll exhibited the best cell viability results and maintained the tissue integrity and presence of stem/progenitor cells. Essential proteins involved in tissue regeneration and immune and antimicrobial control were detected from the secretome of cryopreserved tissue similar to fresh tissue. Furthermore, immunogenic markers, such as human leukocyte antigens, were detected at very low levels in the tissue, confirming their low immunogenicity. Finally, we demonstrate that the tissue can be kept under refrigerated conditions for up to 7 d for further use, maintaining sterility and considerable cell viability. Our cryopreservation and storage protocol kept the AM viable for at least 20 months. In conclusion, this study enabled us to determine a novel efficient protocol for long-term AM preservation for future clinical applications.
Vitexin loaded mixed polymeric micelles: preparation, optimization, evaluation and anti-osteoporotic effect
Authors: Zhang Jian , Li Xiaoxiao , Xia Xiaoli , Adu-Frimpong Michael , Shen Xinyi , He Qing , Rong Wanjing , Shi Feng , Cao Xia , Ji Hao , Toreniyazov Elmurat , Wang Qilong , Yu Jiangnan , Xu Ximing
Published: April 2023

In this regard, we developed vitexin (Vi)-loaded D-ɑ-tocopherol polyethylene glycol succinate, polyvinylpyrrolidone K30 and sodium cholate mixed micelles (Vi-MMs) mainly for improving oral bioavailability and enhancing anti-osteoporotic effect of Vi. Thin layer dispersion method was employed to prepare Vi-MMs, and then the optimal prescription was optimized by the orthogonal design-response surface method, wherein encapsulation efficiency (EE) was used as optimizing index. The physical properties of Vi-MMs such as appearance morphology, particle size, and zeta potential were also characterized. We further analyzed the in-vitro release of Vi and Vi-MMs in three media and investigated the pharmacokinetics of Vi and Vi-MMs in rats. Anti-osteoporotic activity of Vi and Vi-MMs was assessed by establishing a zebrafish osteoporosis model with prednisone. Drug loading, EE, particle size and zeta potential of the optimized Vi-MMs were 8.58 ± 0.13%, 93.86 ± 1.79%, 20.41 ± 0.64 nm and −10 ± 0.56 mV, respectively. The optimized Vi-MMs were shaped spherically as exhibited by transmission electron microscopic technique, with evident core shell nano-structure, well dispersed. In all three media, the release rate of Vi-MMs was significantly higher than that of free Vi. The oral bioavailability of Vi-MMs was increased by 5.6-fold compared to free Vi. In addition, alleviation of prednisone induced osteoporosis in zebrafish by Vi-MMs further demonstrated good anti-osteoporotic effect. In summary, Vi-MMs exhibited enhanced bioavailability and anti-osteoporotic effect, which is expected to be potential nanocarrier for Vi applications in drug development.