Racial inequality in the production of fresh vegetables and cut flowers in Argentina: an analysis in Greater La Plata by Nuria Caimmi

“…Positive valuations of ultra-processed foods by those living and working in the area reflect the importance of belonging to the host society, running parallel to strategies for preserving food preparations from before migration. …”
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Damage Evolution of Granite under Ultrasonic Vibration with Different Amplitudes by Junpeng Han, Dajun Zhao, Shulei Zhang, Yu Zhou

“…As a type of ultra-high frequency loading, ultrasonic vibration is an effective way to break the rock at high rates. …”
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Establishment and performance analysis of RIS-assisted coded relay cooperation system based on LDPC product codes by Shunwai ZHANG, Jin WANG

“…To pursue the ultra-reliable information transmission, the system which combined the reconfigurable intelligent surface (RIS) technology and coded relay cooperation technology was investigated.The RIS-assisted coded relay cooperation system model based on low density parity check (LDPC) product codes was established.Based on LDPC product codes, the information matrix was row-encoded by the source node and column-encoded by the relay node, respectively.An efficient joint iterative decoding algorithm was proposed.The two received signals at the destination were row-decoded and column-decoded iteratively to update the logarithmic likelihood ratios of information bits, and then the decoding decision was made.The closed-form solutions of the outage probability and the channel capacity with finite codelength were theoretically derived.Theoretical analysis and simulation results show that the proposed system obviously outperforms the traditional coded relay cooperation.The more number of RIS elements, the more significant advantage can be obtained.Simulation results also demonstrate that the channel capacity with finite codelength approaches the ideal channel capacity with the codelength of LDPC product codes increasing.…”
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A Petrobrás e a indústria de petróleo no Brasil: geopolítica e estratégia nacional de desenvolvimento by Wanderley Messias da Costa

“…At the same time, the political mobilization of the 1950s inspired by the sovereign defense of national interests that resulted in the creation of Petrobras combined with the successful decision to structure it as the creative and radiating nucleus of advanced technologies that made it the world leader in exploration and production of oil in deep and ultra deep waters and made possible national self-sufficiency. …”
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Planar Monopoles with Different Radiator Shapes for UWB Body-Centric Wireless Communications by Y. Y. Sun, S. W. Cheung, T. I. Yuk

“…This paper presents a study on the performances of a group of planar monopoles using radiators of different shapes, such as triangle, rectangle, square, annual ring, circle, horizontal ellipse, vertical ellipse, pentagon, and hexagon, for ultra-wideband (UWB) body-centric wireless communications. …”
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Performance analysis of 60 GHz pulse multiuser communication system based on cross-layer strategy by Xuehua LI, Chen SHEN, Yuanyuan YAO

“…Due to the advantages of license-free,strong directionality,high system capacity,and high transmission rate of Gbit/s,60 GHz band is listed as one of the candidate bands for new radios (new radio).In 5G ultra-dense networking scenario,the randomness of node switching caused by the decrease of the distance between network nodes may cause severe multiple access interference and resource mismatch problems.In this regard,based on the concept of cross-layer collaborative design,a resource scheduling strategy based on fairness was proposed.The multiple access performance of the strategy was simulated in a 60 GHz pulsed wireless communication system based on TH-PAM (time hopping pulse amplitude modulation).Simulation results show that compared with the system with pure physical layer optimization algorithm,the multiple access system which adopts this strategy shows stronger fairness and lower system error rate,but it needs increase the transmission power to meet the requirements of the coverage of the equivalent communication system.That is,there is a certain trade-off between the energy and fairness of the system,which can be used to guide the structure and deployment of the actual communication system.…”
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Research on the edge-end collaboration framework for deterministic network by Guangmin SONG, Qunqing WANG, Zhanbing HUANG, Xun SHI, Gaojian HAN

“…5G vertical industries such as industrial automatic control have strict requirements on network transmission delay and reliability.It was focused on the AGV collaborative carrying scenarios, in which the key quality indicator (KQI) of the AGV collaboration and the requirements for network jitter were analyzed.Existing 5G ultra-low-latency technologies, such as the pre-scheduling mechanism, reduce transmission scheduling latency by reserving a large number of time-frequency resources, which heavily decreases spectrum efficiency.In addition, wireless channel quality factors such as weak coverage and interference, often cause large jitter, making it difficult to meet the service reliability requirements.In order to deal with these challenges, a deterministic edge-end cooperation framework design to guarantee end-to-end latency was proposed.Based on service flow characteristics, resource reservation was utilized to reduce scheduling latency.Moreover, the proposed framework could enhance data transmissions when poor status of channels was sensed.The experimental results show that the edge-end collaboration framework design can effectively increase the delay reliability, reduce the large jitter, and improve the KQI of AGV collaboration.…”
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An Adaptive Large Neighborhood Search Heuristic for the Electric Vehicle Routing Problems with Time Windows and Recharging Strategies by Ya-ru Duan, Yong-shi Hu, Peng Wu

“…., full or partial recharging) and three recharging technologies (i.e., normal, rapid, and ultra-rapid) are considered. For this problem, we first develop a mixed-integer linear programming model defined in a series of vertices including a depot, a series of recharging stations, and a set of customers. …”
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Multi‐Objective Evaluation Method for Efficient Water Energy Utilization in Multistage Hydraulic Turbines With Ultrahigh Water Head and Low Flow Rate by Zichao Zhang, Sanya Zhao, Yanpin Li

“…This method is recommended for the design of ultra‐low specific speed multistage hydraulic turbines with a specific speed of less than 50.…”
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A Run-Time Reconfigurable Ge Field-Effect Transistor With Symmetric On-States by Andreas Fuchsberger, Lukas Wind, Daniele Nazzari, Larissa Kuhberger, Daniel Popp, Johannes Aberl, Enrique Prado Navarrete, Moritz Brehm, Lilian Vogl, Peter Schweizer, Sebastian Lellig, Xavier Maeder, Masiar Sistani, Walter M. Weber

“…Thereto, we have monolithically integrated an ultra-thin epitaxial and defect-free Ge layer on a Si on insulator platform. …”
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Comparison of Conventional and Advanced Concrete Technologies in terms of Construction Efficiency by Matej Špak, Mária Kozlovská, Zuzana Struková, Renáta Bašková

“…Nowadays, high-performance concrete (HPC) and ultra-high-performance concrete (UHPC) are ranked among advanced concrete technologies. …”
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A Topology Visualization Early Warning Distribution Algorithm for Large-Scale Network Security Incidents by Hui He, Guotao Fan, Jianwei Ye, Weizhe Zhang

“…As the algorithm transforms the large-scale network topology plane visualization problem into a series of small-scale network topology plane visualization and distribution problems, it has higher parallelism and is able to handle the display of ultra-large-scale network topology.…”
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The Arctic zone of the Republic of Karelia: Search for ways of Development by Valery P. Zhuravel

“…The problem of creating cascades of small hydroelectric power plants in the region and a network of data processing and storage centres based on domestic high-speed ultra-dense solutions is considered. The article examines the dynamics of the population of Arctic municipalities, the experience of Arctic residents and their tax benefits. …”
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Soliton solutions, bifurcations, and sensitivity analysis to the higher-order nonlinear fractional Schrödinger equation in optical fibers by Md. Al Amin, M. Ali Akbar, M. Ashrafuzzaman Khan, Md. Sagib

“…In this article, we present new exact soliton solutions for the space-time fractional higher-order nonlinear Schrödinger equation, which describes the propagation of ultra-short pulses in nonlinear optical fibers. We apply a traveling wave transformation with the Beta derivative to convert the nonlinear fractional differential equation into a standard nonlinear differential equation. …”
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Demonstration of high-reconfigurability and low-power strong physical unclonable function empowered by FeFET cycle-to-cycle variation and charge-domain computing by Taixin Li, Xinrui Guo, Franz Müller, Sukhrob Abdulazhanov, Xiaoyang Ma, Hongtao Zhong, Yongpan Liu, Vijaykrishnan Narayanan, Huazhong Yang, Kai Ni, Thomas Kämpfe, Xueqing Li

“…Remarkably, our PUF achieves near-ideal reconfigurability and ultra-low 1.89fJ per bit readout energy, significantly outperforming the state-of-the-art PUFs. …”
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Resonant Frequency Calculation and Optimal Design of Peano Fractal Antenna for Partial Discharge Detection by Jian Li, Changkui Cheng, Lianwei Bao, Tianyan Jiang

“…Ultra-high-frequency (UHF) approaches have caught increasing attention recently and have been considered as a promising technology for online monitoring partial discharge (PD) signals. …”
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Ocean wave-driven covalent organic framework/ZnO heterostructure composites for piezocatalytic uranium extraction from seawater by Jia-Xin Qi, Jing-Wen Gong, Cheng-Rong Zhang, Zhi-Hai Peng, Yuan-Jun Cai, Xin Liu, Jin-Lan Liu, Xiao-Juan Chen, Ru-Ping Liang, Jian-Ding Qiu

“…As a result, ZnO@COF achieves an ultra-high efficiency of 7.56 mg g−1 d−1 for uranium extraction from natural seawater driven by waves. …”
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Discoloration Effects of High-Dose γ-Irradiation and Long-Term Thermal Aging of (U)HMW-PE by Anja Kömmling, Emmanouil Chatzigiannakis, Jörg Beckmann, Volker Wachtendorf, Kerstin von der Ehe, Ulrike Braun, Matthias Jaunich, Ulrich Schade, Dietmar Wolff

“…Two polyethylene types with ultra-high (UHMW-PE) and high molecular weight (HMW-PE) used as neutron radiation shielding materials in casks for radioactive waste were irradiated with doses up to 600 kGy using a 60Co gamma source. …”
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Low-error encoder for time-bin and decoy states for quantum key distribution by Davide Scalcon, Elisa Bazzani, Giuseppe Vallone, Paolo Villoresi, Marco Avesani

“…Here, we introduce the MacZac (Mach-Zehnder-Sagnac), a time-bin encoder with ultra-low QBER (<2 × 10−5) and high stability. Based on nested Sagnac and Mach-Zehnder interferometers, it uses a single phase modulator for both decoy and state preparation, simplifying the optical setup. …”
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Widefield Optical Coherence Tomography Angiography in Diabetic Retinopathy by Alessia Amato, Francesco Nadin, Federico Borghesan, Maria Vittoria Cicinelli, Irini Chatziralli, Saena Sadiq, Rukhsana Mirza, Francesco Bandello

“…A PubMed-based search was carried out using the terms “Diabetic retinopathy”, “optical coherence tomography angiography”, “widefield imaging”, and “ultra-widefield imaging”. All studies published in English up to August 2020 were reviewed. …”
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