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Torsional optomechanical cooling of a nanofiber

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Photonics Research 2022年第2期10卷 601-609页

作者： Dianoiang Su Pablo Solano Jeffrey D.Wack luis a.orozco Yanting Zhao State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China Departamento de Fisica Facultad de Ciencias Fisicas y MatematicasUniversidad de ConcepcionConcepciónChile Joint Quantum Institute Department of Physics and NISTUniversity of MarylandCollege ParkMaryland 20742USA

We demonstrate the optomechanical cooling of a tapered optical nanofiber by coupling the polarization of light to the mechanical angular momentum of the system. The coupling is enabled by birefringence in the fiber and does not make use of an optical resonator. We find evidence for cooling in the distribution of thermally driven amplitude fluctuations and the noise spectrum of the torsional modes. Our proof-of-principle demonstration shows cavity-less cooling of the torsional degree of freedom of a macroscopically extended nanofiber.

关键词： fiber polarization resonator

A renewal theory based performance and configuration framework of the IEEE 802.11ah RAW mechanism

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Digital Communications and Networks 2023年第1期9卷 236-251页

作者： Hamid Taramit luis orozco-Barbosa Abdelkrim Haqiq Hassan First University of Settat Faculty of Sciences and TechniquesComputerNetworksMobility and Modeling Laboratory:IR2M26000 SettatMorocco Albacete Research Institute of Informatics Universidad de Castilla-La Mancha02006 AlbaceteSpain

IEEE 802.11ah is a new Wi-Fi standard for sub-1Ghz communications,aiming to address the challenges of the Internet of Things(IoT).Significant changes in the legacy 802.11 standards have been proposed to improve the network performance in high contention scenarios,the most important of which is the Restricted Access Window(RAW)*** mechanism promises to increase the throughput and energy efficiency by dividing stations into different *** this scheme,only the stations belonging to the same group may access the channel,which reduces the collision probability in dense ***,the standard does not define the RAW grouping *** this paper,we develop a new mathematical model based on the renewal theory,which allows for tracking the number of transmissions within the limited RAW slot contention period defined by the *** then analyze and evaluate the performance of RAW *** also introduce a grouping scheme to organize the stations and channel access time into different groups within the ***,we propose an algorithm to derive the RAW configuration parameters of a throughput maximizing grouping *** additionally explore the impact of channel errors on the contention within the time-limited RAW slot and the overall RAW optimal *** presented analytical framework can be applied to many other Wi-Fi standards that integrate periodic channel *** simulations using the MATLAB software validate the analytical model and prove the effectiveness of the proposed RAW configuration scheme.

关键词： IEEE 802.11ah Performance evaluation Renewal theory RAW mechanism Internet of things

Pressure drop analysis on the positive half-cell of a cerium redox flow battery using computational fluid dynamics: mathematical and modelling aspects of porous media

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Frontiers of Chemical Science and Engineering 2021年第2期15卷 399-409,F0004页

作者： Fernando F.Rivera Berenice Miranda-Alcantara German orozco Carlos Ponce de Leon luis F.Arenas National Council of Science and Technology(CONACYT) Mexico City 03940Mexico Center of Research and Technological Development in Electrochemistry(CIDETEQ) Queretaro 76703Mexico Electrochemical Engineering Laboratory Energy Technology Research GroupFaculty of Engineering and Physical SciencesUniversity of SouthamptonSouthampton SO171BJUK

Description of electrolyte fluid dynamics in the electrode compartments by mathematical models can be a powerful tool in the development of redox flow batteries(RFBs)and other electrochemical *** order to determine their predictive capability,turbulent Reynolds-averaged Navier-Stokes(RANS)and free flow plus porous media(Brinkman)models were applied to compute local fluid velocities taking place in a rectangular channel electrochemical flow cell used as the positive half-cell of a cerium-based RFB for laboratory *** different platinized titanium electrodes were considered,a plate plus a turbulence promoter and an expanded metal *** pressure drop was validated against experimental data obtained with typical cerium *** was found that the pressure drop values were better described by the RANS approach,whereas the validity of Brinkman equations was strongly dependent on porosity and permeability values of the porous media.

关键词： CFD simulation porous media porous electrode pressure drop redox flow battery

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使用同步检测进行精密低电平测量

中国集成电路 2015年第4期24卷 75-80页

作者： luis orozco ADI公司

同步检测是一项实用的技术，可提取隐藏于噪底以下的低电平信号，在仪器仪表领域有很多应用。比如：测量非常小的电阻，测量在强背景光下光的吸收或反射，或者在高噪声电平的情况下进行应变测量。

关键词：低电平测量同步检测电平信号仪器仪表应变测量噪声电平背景光隐藏

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精密光电二极管传感器电路优化设计

中国电子商情 2014年第7期 37-40页

作者： luis orozco ADI公司

光电二极管放大器是大多数精密光学测量系统的重要构建模块。选择正确的运算放大器制很重要,是获得最佳系统性能的第一步。使用其他性能增强技术——比如可编程增益和同步检测,有助于增加动态范围并抑制噪声。

关键词：运算放大器传感器电路光学测量系统同步检测优化设计动态范围走线系统性能同步解调器传递

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用嵌入微脂粒的利福平、异菸肼治疗鼠结核

宁夏医科大学学报 1987年第2期 89-91页

作者： luis C.orozco 马颖

嵌有利福平、异菸肼的微脂粒实验性治疗重症鼠结核病。将小鼠分为四个组:对照组和单纯微脂粒治疗组的小鼠患病最重。该两组的累积存活率亦最低,30天后约为50％,活菌形成单位(CFU)和肺比重根号(RSLW)数值最高。肺的组织病理学具有明显的... 详细信息

嵌有利福平、异菸肼的微脂粒实验性治疗重症鼠结核病。将小鼠分为四个组:对照组和单纯微脂粒治疗组的小鼠患病最重。该两组的累积存活率亦最低,30天后约为50％,活菌形成单位(CFU)和肺比重根号(RSLW)数值最高。肺的组织病理学具有明显的弥漫性损害。然而,单纯微脂粒治疗组的结核菌生长明显高于对照组。用药物和嵌有药物的微脂粒治疗的二组小鼠存活率较高,30天后达85％,且CFU和RSLW的数值最低、肺组织的炎症也明显为轻,呈局灶性。各项数值提示以RFP和INH嵌入微脂粒的治疗组动物的疗效显著。

关键词：微脂粒小鼠结核病对照组小家鼠 CFU 药物治疗利福霉素利福平

Tibolone modulates neuronal plasticity through regulating Tau, GSK3β/Akt/PI3K pathway and CDK5 p35/p25 complexes in the hippocampus of aged male mice

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Neural Regeneration Research 2017年第4期12卷 588-595页

作者： Teresa Neri-Gomez Judith Espinosa-Raya Sofia Diaz Cintra Julia Segura-Uribe Sandra.orozco-Suarez Juan Manuel Gallardo Christian Guerra-Araiza Unidad de Investigación Médica en Farmacología Hospital de Especialidades Centro Médico Nacional Siglo XXI Instituto Mexicano del Seguro Social Ciudad de México México Laboratorio de Farmacología Conductual Escuela Superior de Medicina Instituto Politécnico Nacional Plan de San Luis y Díaz Mirón Col. Sto. Tomás Ciudad de México México Departamento de Neurobiología del Desarrollo y Neurofisiología Instituto de Neurobiología Universidad Nacional Autónoma de México Campus Juriquilla Querétaro Querétaro México Enfermedades Neurológicas (Neurological Diseases) Hospital de Especialidades Centro Médico Nacional Siglo XXI Instituto Mexicano del Seguro Social Ciudad de México México Enfermedades Nefrológicas (Kidney Diseases) Hospital de Especialidades Centro Medico Nacional Siglo XXI Instituto Mexicano del Seguro Social Ciudad de Mexico Mexico

Aging is a key risk factor for cognitive decline and age-related neurodegenerative disorders. Also, an age-related decrease in sex steroid hormones may have a negative impact on the formation of neurofibrillary tangles （NFTs）; these hormones can regulate Tau phosphorylation and the principal kinase GSK3β involved in this process. Hormone replacement therapy decreases NFTs, but it increases the risk of some types of cancer. However, other synthetic hormones such as tibolone （TIB） have been used for hormone replacement therapy. The aim of this work was to evaluate the long-term effects of TIB （0.01 mg/kg and 1mg/kg, intragastrically for 12 weeks） on the content of total and hyperphosphorylated Tau （PHF-1） proteins and the regulation of GSK3β/Akt/PI3K pathway and CDK5/p35/p25 complexes in the hippocampus of aged male mice. We observed that the content of PHF-1 decreased with TIB administration. In contrast, no changes were observed in the active form of GSK3β or PI3K. TIB decreased the expression of the total and phosphorylated form of Akt while increased that of p110 and p85. The content of CDK5 was differentially modified with TIB： it was increased at low doses and decreased at high doses. When we analyzed the content of CDK5 activators, an increase was found on p35; however, the content of p25 decreased with administration of low dose of TIB. Our results suggest a possible mechanism of action of TIB in the hippocampus of aged male mice. Through the regulation of Tau and GSK3β/Akt/PI3K pathway, and CDK5/p35/p25 complexes, TIB may modulate neuronal plasticity and regulate learning and memory processes.

关键词： nerve regeneration Tibolone hippocampus aged mice sex steroids Akt GSK3β PI3K neuralplasticity Tau neurofibrillary tangles neural regeneration

Winter and Summer Evaluation of Bacteriological Water Quality at Recreational Beaches along Todos Santos Bay, Baja California, Mexico

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Advances in Microbiology 2014年第15期4卷 1132-1139页

作者： María Victoria.orozco-Borbón Efraín A. Gutiérrez-Galindo luis. F. Navarro-Olache Albino Munoz-Barbosa Vinicio Macías-Zamora Celia Pérez-Capetillo Instituto de Investigaciones Oceanológicas Universidad Autónoma de Baja CaliforniaCarretera Transpeninsular Ensenada-TijuanaFracc.PlayitasEnsenadaMéxico Centro de Estudios Tecnológicos del Mar No.11 Carretera Ensenada-TijuanaEnsenadaMéxico Posgrado en Oceanografía Costera Facultad de Ciencias Marinas/Instituto de Investigaciones OceanológicasUniversidad Autónoma de Baja CaliforniaCampus Punta MorroCarretera Tijuana-EnsenadaEnsenadaMexico

Water bacteriological qualities of 22 recreational beaches in Ensenada Bay, Baja California, Mexico were analyzed during the summer and winter of 2008. Total and fecal coliforms as well as enterococci bacteria were used as pollution indicators. Results showed that bacteria concentrations were higher in winter than summer, associated with Southern California rainy season. Bacteria loads in winter exceeded both the daily and monthly standards showing a clear effect of storm water runoff in the quality of Todos Santos Bay recreational beaches. Statistical analysis showed significant differences between bacteria concentration during summer and winter. The general behavior of the indicators based on daily and monthly standards from high to low was enterococci > FC > TC> total/fecal ratio. Water discharged from 3 sewage treatment plants were responsible for the pollution observed at stations, when the uptake capacity of plants exceeded the storage. During summer pollution was due to non-programmed discharges from sewage treatment plants.

关键词： Water Quality Enterococci Todos Santos Bay

利用腔量子电动力学系统实现原子和光场之间的稳态纠缠以及高保真度原子探测

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利用腔量子电动力学系统实现原子和光场之间的稳态纠缠以及高保真...