bluuebunny/crossref_metadata_2025_split huggingface dataset:
Linear programming‐based proportional‐integral‐derivative control of positive systems
Authors: Zhou Xiaoyue , Zhang Junfeng , Jia Xianglei , Wu Di 
Published: March 2023

AbstractThis paper investigates the proportional‐integral‐derivative (PID) control of positive systems in the discrete‐time case. First, a tuning parameter is introduced to construct the proportional‐integral‐derivative control framework of positive systems. The proportional‐integral‐derivative control problem is thus transformed into the control synthesis of positive systems with time‐delay. By virtue of a matrix decomposition approach, the gain matrices of proportional‐integral‐derivative controller are designed. Using co‐positive Lyapunov functions and linear programming, the positivity and stability of positive systems are achieved under the designed proportional‐integral‐derivative controller. Then, the proportional‐integral‐derivative control of positive systems with reference signal is solved. The main contribution of this paper lies in that linear programming associated to the matrix decomposition approach is first presented to handle the proportional‐integral‐derivative control of positive systems. Finally, two illustrative examples are provided to verify the effectiveness of the proposed design.
Predictive discrete‐time sliding mode based direct power control for grid‐connected energy conversion systems
Authors: Huseinbegović Senad , Peruničić‐Draženović Branislava , Veselić Boban , Milosavljević Čedomir , Petronijević Milutin 
Published: March 2023

AbstractA method for digital direct power control design for grid‐connected energy conversion systems was proposed in this paper. The active and reactive powers are directly controlled with constant switching frequency by selecting an appropriate switching control sequence of voltage source converter as a key part of energy conversion systems. The control design combines a discrete‐time sliding mode control and predictive control. The selection of feasible switching control vectors is a direct result of the discrete‐time sliding mode control approach. These vectors satisfy the existence conditions of the sliding mode, but each of them induces system motion with different properties. The task of predictive control is to select an appropriate switching control sequence to reduce the chattering phenomenon, steady‐state error, and overshoot. The cost function of the prediction process is defined as the average value of both power errors on the prediction horizon of three sampling periods. Simulation results, experimental results, and results of a comparative analysis are presented in order to show the performance and effectiveness of the proposed control design.
Investigating the impact of a dynamic thermal rating on wind farm integration
Authors: Dawson Leanne , Knight Andrew M. 
Published: March 2023

AbstractWith an increased focus on renewable power generation, dynamic thermal ratings of various power equipment are being investigated to connect the new intermittent generation to the grid without needing to replace existing infrastructure. Previous research is mainly focused on a dynamic thermal rating for overhead lines. End‐of‐line equipment are also restricted by a thermal limit. This paper combines the thermal model for overhead lines with the transformer thermal model, to investigate the impact of environmental conditions on both. A wind farm case study is used to determine the potential increase in capacity using a combined thermal model. The impact of a higher thermal limit on the loss of life of the transformer is compared to the amount of curtailed wind and the potential revenue from the added wind farm. This analysis serves to provide a method to analyse the risks of using a higher transformer thermal limit, compared to the benefits of increased wind penetration and additional revenue.
Investigating the turbulent hot gas in X-COP galaxy clusters
Authors: Dupourqué S. , Clerc N. , Pointecouteau E. , Eckert D. , Ettori S. , Vazza F. 
Published: March 2023

Context. Turbulent processes at work in the intracluster medium perturb this environments, impacting its properties, displacing gas, and creating local density fluctuations that can be quantified via X-ray surface brightness fluctuation analyses. Improved knowledge of these phenomena would allow for a more accurate determination of the mass of galaxy clusters, as well as a better understanding of their dynamic assembly.
Aims. In this work, we aim to set constraints on the structure of turbulence using X-ray surface brightness fluctuations. We seek to consider the stochastic nature of this observable and to constrain the structure of the underlying power spectrum.
Methods. We propose a new Bayesian approach, relying on simulation-based inference to account for the whole error budget. We used the X-COP cluster sample to individually constrain the power spectrum in four regions and within R500. We spread the analysis on the entire set of 12 systems to alleviate the sample variance. We then interpreted the density fluctuations as the result of either gas clumping or turbulence.
Results. For each cluster considered individually, the normalisation of density fluctuations correlate positively with the Zernike moment and centroid shift, but negatively with the concentration and the Gini coefficient. The spectral index within R500 and evaluated over all clusters is consistent with a Kolmogorov cascade. The normalisation of density fluctuations, when interpreted in terms of clumping, is consistent within 0.5R500 with the literature results and numerical simulations; however, it is higher between 0.5 and 1R500. Conversely, when interpreted on the basis of turbulence, we deduce a non-thermal pressure profile that is lower than the predictions of the simulations within 0.5 R500, but still in agreement in the outer regions. We explain these results by the presence of central structural residues that are remnants of the dynamical assembly of the clusters.
Gesund beginnt im Mund: Zahngesundheit bei Kindern
Authors: Nadj-Papp Edith 
Published: March 2023

SummaryMundgesundheit beginnt bereits im Mutterleib. Zahnprobleme der Mutter während der Schwangerschaft können sich auf das Ungeborene auswirken. Bei Babys und Kindern nehmen dann das Stillen, die Ernährung, aber auch das Benutzen eines Schnullers wesentlichen Einfluss auf die Zähne. Wichtig ist eine konsequente Zahnpflege ab dem Durchbruch des ersten Zahns. ­Experten empfehlen, Kinder bereits ab dem 6. Lebensmonat zahnmedizinisch zu begleiten. Versiegelungen, Füllungen und Kronen sind wichtige Maßnahmen bei Zahnproblemen – auch bei Kindern.
Ernährung von Kindern im Vorschulalter
Authors: Kalhoff Hermann , Kersting Mathilde 
Published: March 2023

SummaryDie Prävention typischer Zivilisationskrankheiten schon im frühen Kindesalter ist eine aktuelle Herausforderung in der Kinder- und Jugendmedizin und der Ernährungswissenschaft. Der Kinder- und Jugendarzt spielt eine besondere Rolle in der Ernährungsberatung von Familien. Wichtige Botschaften für die gesunde Ernährung im Vorschulalter sind: Rohkost, Gemüse oder Obst zu allen Mahlzeiten, Wasser als Regelgetränk und täglich eine gemeinsame Mahlzeit in der Familie.
Tratamento de cisto sinovial dorsal do punho com escleroterapia percutânea utilizando solução salina hipertônica
Authors: Gobetti Murilo , Santos João Baptista Gomes dos , Pires Fernando Araujo , Nakachima Luis Renato , Belloti João Carlos , Faloppa Flavio 
Published: March 2023

Resumo
Objetivo Avaliar a eficácia da infiltração da solução salina hipertônica como agente esclerosante no cisto sinovial dorsal do punho.
Método Pacientes de ambos os sexos, com 18 anos ou mais, com diagnóstico clínico e ultrassonográfico de cisto sinovial, e sem nenhum tratamento prévio foram selectionados. Série de casos em que 50 pacientes foram submetidos a aspiração do conteúdo do cisto e infiltração da solução salina hipertônica (2 ml solução de cloreto de sódio 20% e 1 ml de lidocaína 2%). Seguimento realizado por 24 semanas, durante as quais foram avaliados os parâmetros dor, força, arco de movimento, função (questionários quick disabilities of the arm, hand, and shoulder [quickDASH] e brief Michigan), recorrência e complicações.
Resultado Foram avaliados 46 pacientes por 24 semanas, 18 (39,1%) cistos evoluíram para cura e 28 (60,9%) cistos apresentaram recorrência. Não houve diferença estatisticamente significante nos quesitos força e arco de movimento. Não houve diferença clinicamente significante nos escores dos questionários. As complicações mais frequentes foram dor e edema.
Conclusão A infiltração com solução salina hipertônica para tratamento do cisto sinovial dorsal do punho mostrou taxa de recorrência de 60,9%.
Relação dos ligamentos cruzados e meniscofemorais com a osteologia do joelho: Um estudo anatômico
Authors: Corbi-Aguirre Fernando , Forriol Francisco 
Published: March 2023

Resumo
Objetivo Analisar as dimensões do ligamento cruzado posterior (LCP), do ligamento cruzado anterior (LCA), a presença de ligamentos meniscofemorais (LMFs) em joelhos humanos e a correlação com as dimensões do esqueleto do joelho.
Métodos Estudo anatômico em 29 espécimes de joelhos humanos nos quais medimos o comprimento e a largura dos ligamentos cruzado e meniscofemoral e as dimensões dos côndilos femorais e tibiais e do entalhe femoral. O comprimento do LCA foi calculado com diferentes graus de flexão do joelho. Analisou-se a relação entre os ligamentos e as dimensões ósseas.
Resultados O comprimento do LCA e do LCP foram semelhantes, LMF posterior foi mais frequente e mais longo do que o LMF anterior. Foram encontradas LMF posterior em 72,41% dos joelhos e LMF anterior em 20,69%. O LCA apresentou 30% de seu comprimento máximo até 60°, aproximadamente metade de seu comprimento entre 90° e 120°, atingindo seu comprimento máximo com flexão de 170°. Encontramos uma forte correlação entre o comprimento do LCA e do LCP (p = 0,001). No entanto, os comprimentos do LCA e do LCP não estavam relacionados com as dimensões ósseas.
Conclusão Não encontramos correlações entre os ligamentos cruzado e meniscofemoral e as dimensões anatômicas do entalhe intercondilar e da tíbia proximal e do fêmur distal. A presença do LMF posterior foi mais frequente e maior que a do ligamento anterior.
The theoretical systems of OFDI location determinants in global north and global south economies
Authors: Liu Yanfeng , Li Xue , Zhu Xiaonan , Lee Min-Kyu , Lai Po-Lin 
Published: March 2023

AbstractWith economic transformation and industrial development, Outward Foreign Direct Investment (OFDI) from southern countries has increased rapidly. The theoretical system established by global north countries with their dominant position in the international investment market has been impacted by global south countries. The existing OFDI theory has always been based on developed countries and can only explain some international investment behavior of southern countries. The Vector Error Correction Model (VECM) is applied to conduct empirical analysis for the impact of the target country’s investment climate on the location determinants of OFDI, by applying China and the United States as example which is focusing on 172 countries from 2005 to 2019. The results reveal significant differences in the theoretical system of foreign investment between China and the United States. For China, investment climate factors such as energy, logistics infrastructure, and politics are discover as the main drivers of China’s OFDI. However, USA’s OFDI is a corporate behavior aimed at economic interests. The differences in OFDI theoretical systems and provides policy advice for northern and southern countries and departments is the major contribution of this research.
Cultural intelligence and sales performance in online insurance marketing: evidence from a Chinese insurance firm
Authors: Pan Guochen , Liu Mengqi , Tseng Lu-Ming , Geng Zhixiang 
Published: March 2023

AbstractThe cultural clash between customers and salespeople in online marketing is observed as a barrier to promoting sales performance.The capability of handling cultural difference, or cultural intelligence (CQ), is therefore essential for salespeople. With data collected through questionnaires from a Chinese digital insurance brokerage firm, the impact of salespeople’s CQ on sales performance is examined with the partial least squares structural equation model (PLS-SEM) method. It is identified that CQ serves as a positive moderating variable in the relationship between customer orientation and sales performance, as well as a partial mediating variable in the relationship between perceived organizational support and sales performance of the online insurance salespeople.
The water cavitation line as predicted by the TIP4P/2005 model
Authors: P. Lamas Cintia , Vega Carlos , G. Noya Eva , Sanz Eduardo 
Published: March 2023

The formation of vapor bubbles in a metastable liquid, cavitation, is an activated process due to the free energy cost of having both phases at contact. Such an energetic penalty enables the existence of the liquid beyond its thermodynamic borders. Establishing the stability limits of a liquid as ubiquitous as water has important practical implications and has thereby attracted a lot of attention. Different experimental strategies and theoretical analyses have been employed to measure and predict the cavitation line, or the pressure–temperature kinetic stability border of liquid water. Understanding the location of the cavitation line requires knowing the cavitation rate dependence on pressure and temperature. Such dependency is difficult to obtain in experiments, and we use molecular simulations with the TIP4P/2005 model to fill this gap. By deeply overstretching liquid water below the saturation pressure, we are able to observe and quantify spontaneous cavitation. To deal with a lower overstretching regime, we resort to the Seeding technique, which consists of analyzing simulations of a liquid containing a vapor bubble under the theoretical framework of Classical Nucleation Theory. Combining spontaneous cavitation with Seeding, we get a wide overview of the cavitation rate. We study two different temperatures (450 and 550 K) and complement our perspective with the results previously obtained at 296.4 K [Menzl et al., Proc. Natl. Acad. Sci. 113, 13582 (2016)] to establish a broad simulation-experiment comparison. We find a good agreement between simulations and both isobaric heating and isochoric cooling experiments using quartz inclusions. We are, however, unable to reconcile simulations with other experimental techniques. Our results predict a decrease in the solid–liquid interfacial free energy as the liquid becomes increasingly overstretched with a temperature independent Tolman length of 0.1 nm. Therefore, the capillarity approximation underestimates the nucleation rate. Nonetheless, it provides a fair indication of the location of the cavitation line given the steep rate vs pressure dependence. Overall, our work provides a comprehensive view of the water cavitation phenomenon and sets an efficient strategy to investigate it with molecular simulations.
Transient absorption spectroscopy based on uncompressed hollow core fiber white light proves pre-association between a radical ion photocatalyst and substrate
Authors: Kumar Ajeet , Malevich Pavel , Mewes Lars , Wu Shangze , Barham Joshua P. , Hauer Jürgen 
Published: March 2023

We present a hollow-core fiber (HCF) based transient absorption experiment, with capabilities beyond common titanium:sapphire based setups. By spectral filtering of the HCF spectrum, we provide pump pulses centered at 425 nm with several hundred nJ of pulse energy at the sample position. By employing the red edge of the HCF output for seeding CaF2, we obtain smooth probing spectra in the range between 320 and 900 nm. We demonstrate the capabilities of our experiment by following the ultrafast relaxation dynamics of a radical cationic photocatalyst to prove its pre-association with an arene substrate, a phenomenon that was not detectable previously by steady-state spectroscopic techniques. The detected preassembly rationalizes the successful participation of radical ionic photocatalysts in single electron transfer reactions, a notion that has been subject to controversy in recent years.
A Zn-based catalyst with high oxygen reduction activity and anti-poisoning property for stable seawater batteries
Authors: Liu Yingxin , Jiang Xin , Wang Li , Meng Rongwei , Tang Quanjun , Guo Yong , Han Zishan , Ling Guowei , Zhang Chen , Yang Quan-Hong 
Published: March 2023

Seawater batteries (SWBs) are a key part of the future underwater energy network for maritime safety and resource development due to their high safety, long lifespan, and eco-friendly nature. However, the complicated seawater composition and pollution, such as the S2−, usually poison the catalyst and lead to the degradation of the battery performance. Here, Zn single-atom catalysts (SACs) were demonstrated as effective oxygen reduction reaction catalysts with high anti-poisoning properties by density functional theory calculation and the Zn SACs anchoring on an N, P-doped carbon substrate (Zn-SAC@PNC) was synthesized by a one-pot strategy. Zinc active sites ensure the anti-poisoning property toward S2−, and N, P-doped carbon helps improve the activity. Therefore, Zn-SAC@PNC exhibits superior activity (E1/2: 0.87 V, Tafel slope: 69.5 mV dec−1) compared with Pt/C and shows a lower decay rate of the voltage after discharge in lean-oxygen natural seawater. In the presence of S2−, Zn-SAC@PNC can still maintain its original catalytic activity, which ensures the stable operation of SWBs in the marine environment with sulfur-based pollutants. This study provides a new strategy to design and develop efficient cathode materials for SWBs.
Viral dynamics in tropical coastal waters: effects of warming and nutrient enrichment
Authors: Chai Stanley Choon Yip , Lee Choon Weng , Lim Joon Hai , Bong Chui Wei , Sim Edmund Ui Hang , Narayanan Kumaran , Wang Ai-jun 
Published: March 2023

Context We studied the virus component in the microbial food-web in the tropical coastal Sunda Shelf waters. Aims We investigated viral processes, including the lysogenic to lytic shift dynamics with seawater warming and nutrient enrichment. Methods We sampled nearshore and offshore waters of Peninsular Malaysia to provide a natural trophic gradient for correlational analyses. We also conducted laboratory experiments to investigate the changes in virus production rates and lysogeny, when temperature (range: 25–37°C) and nutrient concentrations (range: 0.1–1.0× marine-broth concentration) were manipulated. Key results Observations showed site-dependent differences in dissolved inorganic nutrient concentration, Chl-a (0.21–3.54 μg L−1) and bacterial abundance (4.09 × 105−9.41 × 105 cells mL−1), but not in viral abundance (measured as virus-like particles or VLP) (1.04 × 106−2.39 × 106 VLP mL−1) and virus production rates (0.59 × 105−4.55 × 105 VLP mL−1 h−1). From laboratory experiments, both warming and nutrient enrichment increased virus production (R2 > 0.651), decreased lysogeny (R2 > 0.743), and resulted in an increase of the viral lysis:bacterial production ratio, and a stronger viral control on bacterial production. Conclusions Although both seawater warming and nutrient enrichment increased virus production and reduced lysogeny, nutrient enrichment was a more important factor. Implications The increasing nutrient concentrations in these waters will increase virus production and virus top-down control of bacteria, and drive the ecosystem towards heterotrophy.
Comparison of supercontinuum spectral widths in CCl4-core PCF with square and circular lattices in the claddings
Authors: Thi Thuy Nguyen , Trong Duc Hoang , Van Lanh Chu 
Published: March 2023

Abstract
In this study, we demonstrate the ability to generate a broad supercontinuum (SC) spectrum with a low peak power of square (S-PCF) and circular (C-PCF) lattice photonic crystal fibers with hollow-core infiltrated with carbon tetrachloride (CCl4). The dispersion and nonlinear characteristics have been numerically analyzed in detail and compared to select the optimal structures for SC generation and evaluate the SC generation efficiency for each PCF. With four optimal proposed structures, the all-normal dispersion of square PCF (#SF1) is found to be flatter and smaller. This results in its SC bandwidth reaching 901 nm at 1.095 μm pumping wavelength which is broader than that of circular PCF (#CF1) (768 nm at 0.98 μm wavelength) despite the lower nonlinear coefficient and higher confinement loss. For the anomalous dispersion regime, #CF2 fiber provides a wider SC spectrum (1753.1 nm) with a peak power of 10 kW compared to #SF2 (1689.6 nm) with a peak power of 13.75 kW thanks to the higher nonlinear coefficient and smaller confinement loss. With the higher nonlinearity of CCl4, the proposed fibers can be a new generation of optical fibers, suitable for low peak power all-fiber optical systems replacing glass core fibers.
Generation of a time–bin Greenberger–Horne–Zeilinger state with an optical switch
Authors: Lo Hsin-Pin , Ikuta Takuya , Azuma Koji , Honjo Toshimori , Munro William J , Takesue Hiroki 
Published: March 2023

Abstract
Multipartite entanglement is a critical resource in quantum information processing that exhibits much richer phenomenon and stronger correlations than in bipartite systems. This advantage is also reflected in its multi-user applications. Although many demonstrations have used photonic polarization qubits, polarization-mode dispersion confines the transmission of photonic polarization qubits through an optical fiber. Consequently, time–bin qubits have a particularly important role to play in quantum communication systems. Here, we generate a three-photon time–bin Greenberger–Horne–Zeilinger (GHZ) state using a 2 × 2 optical switch as a time-dependent beam splitter to entangle time–bin Bell states from a spontaneous parametric down-conversion source and a weak coherent pulse. To characterize the three-photon time–bin GHZ state, we performed measurement estimation, showed a violation of the Mermin inequality, and used quantum state tomography to fully reconstruct a density matrix, which shows a state fidelity exceeding 70%. We expect that our three-photon time–bin GHZ state can be used for long-distance multi-user quantum communication.
Unlocking the multi-electron transfer reaction in NASICON-type cathode materials
Authors: Liu Yuan , Rong Xiaohui , Xie Fei , Lu Yaxiang , Zhao Junmei , Chen Liquan , Hu Yong-Sheng 
Published: March 2023

Abstract
The growing concern about scarcity and large-scale applications of lithium resources has attracted efforts to realize cost-effective phosphate-based cathode materials for next-generation Na-ion batteries (NIBs). In previous work, a series of materials (such as Na4Fe3(PO4)2(P2O7), Na3VCr(PO4)3, Na4VMn(PO4)3, Na3MnTi(PO4)3, Na3MnZr(PO4)3, etc) with ∼120 mAh g−1 specific capacity and high operating potential has been proposed. However, the mass ratio of the total transition metal in the above compounds is only ∼22 wt%, which means that one-electron transfer for each transition metal shows a limited capacity (the mass ratio of Fe is 35.4 wt% in LiFePO4). Therefore, a multi-electron transfer reaction is necessary to catch up to or go beyond the electrochemical performance of LiFePO4. This review summarizes the reported NASICON-type and other phosphate-based cathode materials. On the basis of the aforementioned experimental results, we pinpoint the multi-electron behavior of transition metals and shed light on designing rules for developing high-capacity cathodes in NIBs.