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Computer Modeling in Engineering & Sciences 2019年第11期121卷 609-630页

作者： Felipe J.Torres gerardo V.Guerrero Carlos D.García Ricardo Zavala-Yoe Mario A.García Adolfo R.López University of Guanajuato Division of Engineering Campus Irapuato-SalamancaCarretera Salamanca-Valle de Santiago km 3.5+1.8GuanajuatoSalamanca36885México National Technological of Mexico/National Center of Research and Technological Development Av.Palmira S/N colonia PalmiraMorelosCuernavaca62490México School of Engineering and Sciences Monterrey TechnologicalPuente 222 Ejidos de HuipulcoCiudad de México14380México Superior Technological Institute of Irapuato Carretera Irapuato-Silao km 12.5GuanajuatoIrapuato36821México

A complete modeling(including the actuator dynamics)of a robot manipulator that uses three-phase induction motors is presented in this paper.A control scheme is designed to synchronize robot manipulators actuated by induction motors under a masterslave scheme in the case where the joint velocity of the slave robots is *** of the research on the synchronization of robot manipulators assumes the use of ideal actuators to drive the joints;for that reason,in this work,a three-phase induction motor is considered to be a direct-drive actuator for each *** entire model of the mated system is obtained by a combination of the dynamics of the induction motor and robot ***,the synchronization control algorithm for a master-slave scheme in both the joint space and workspace of robot manipulators driven by induction motors is *** observer based on the entire model is proposed to estimate the joint velocity of the slave robot *** the Lyapunov criterion,a stability analysis of the synchronization control with a velocity estimator is *** analytical results show the synchronization and estimation errors are globally,uniformly,and ultimately *** with multiple robots demonstrate the performance of the proposed control algorithm.

关键词： Synchronization robot manipulator induction motor Lyapunov stability observer based on the model

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新型聚苯醚-聚硅氧烷嵌段共聚物(英文)

化工新型材料 2010年第S1期38卷 119-123页

作者： Alvaro Carrillo gerardo Rocha 郭桦沙泊基础创性塑料有限公司

聚苯醚是一种以其优异的耐水性、尺寸稳定性和固有阻燃性而著称的工程热塑性塑料。通过2,6-二甲酚和丁子香酚-封端的聚硅氧烷的氧化偶联聚合制备了聚苯醚-聚硅氧烷的三嵌段共聚物。这种生产共聚物的方法比现有技术的通过连接预先形成的... 详细信息

聚苯醚是一种以其优异的耐水性、尺寸稳定性和固有阻燃性而著称的工程热塑性塑料。通过2,6-二甲酚和丁子香酚-封端的聚硅氧烷的氧化偶联聚合制备了聚苯醚-聚硅氧烷的三嵌段共聚物。这种生产共聚物的方法比现有技术的通过连接预先形成的聚苯醚和聚硅氧烷嵌段而制备相关共聚物的方法简单。本文描述了该共聚物的结构,以及与聚苯醚均聚物相比,该共聚物在关键性质例如抗冲性、阻燃性和生烟性方面的改进。

关键词：聚苯醚聚硅氧烷嵌段共聚物性能

The Formation of Initial Components of Number Concepts in Mexican Children

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Psychology Research 2012年第7期2卷 422-430页

作者： Yulia Solovieva Luis Quintanar gerardo Ortiz Autonomous University of Puebla Puebla Mexico

The initial formation of number concept represents one of the essential aspects of learning mathematics at the primary school. Children commonly show strong difficulties and absence of comprehension of symbolic and abstract nature of concept of number. The objective of the present study was to show the effectiveness of original method for introduction of elements of concept of number. A pre- and post- test descriptive quantitative and qualitative design was used with an experimental group of Mexican suburban children from Grade 1 of the primary school. The original method for formation of components of concept of number was applied to children from experimental group. The duration of the application was six months in the classroom three days per week. The program included specific training of components of number concept: symbolic, logical, numeric, and spatial. The results of the final assessment indicate positive result in experimental group in comparison with absence of changes in control group. The authors conclude that the method could be useful for organizing pedagogical methodology in Mexican primary schools.

关键词：墨西哥儿童组件比较实验小学生持续时间应用程序组成部分

Recent clinical trials of cancer immunogene therapy in companion animals

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World Journal of Experimental Medicine 2017年第2期7卷 42-48页

作者： Liliana ME Finocchiaro gerardo C Glikin Unidad de Transferencia Genética Instituto de Oncología "ángel H.Roffo"Universidad de Buenos Aires

This mini-review presents the results of veterinary clinical trials on immunogene therapy published from 2014 to 2016. A variety of tumors, among them melanoma(canine and equine), mastocytoma(canine), mammary adenocarcinoma(canine) and fibrosarcoma(feline) were treated by using diverse strategies. Non-viral vectors were usually employed to transfer genes of cytokines, suicide enzymes and/or tumor associated antigens. In general terms, minor or no adverse collateral effects were related to these procedures, and treated patients frequently improved their conditions(better quality of life, delayed or suppressed recurrence or metastatic spread, increased survival). Some of these new methodologies have a promising future if applied as adjuvant treatments of standard approaches. The auspicious results, derived from immunogene therapy studies carried out in companion animals, warrant their imperative usage in veterinary clinical oncology. Besides, they provide a strong preclinical basis(safety assays and proofs of concept) for analogous human clinical trials.

关键词： Cancer Gene therapy Immunotherapy Companion animals Comparative oncology

Insulin Age-Dependently Modulates Synaptic Transmission and AMPA Receptor Trafficking in Region CA1 of the Rat Hippocampus

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Open Journal of Molecular and Integrative Physiology 2016年第2期6卷 19-33页

作者： Shayna A. Wrighten gerardo G. Piroli Department of Biology Francis Marion University Florence SC USA Department of Pharmacology Physiology and Neuroscience University of South Carolina School of Medicine Columbia SC USA

Insulin induces long-term depression (insulin-LTD) in the CA1 region of the rat juvenile hippocampus. This insulin-LTD may be due in part to internalization of the GluA2 subunit of the AMPA receptor (AMPAR) events that haven’t been studied in the mature rat hippocampus. In our studies, we used hippocampal preparations from juvenile (14 - 25 days) and mature (60 - 90 days) rats to assess insulin modulation of CA1 synaptic transmission and AMPAR trafficking and phosphorylation. Using field potential electrophysiology, we observed that insulin induced LTD in the juvenile hippocampus (as previously reported) in the presence and absence of phosphoinositide 3-kinase (PI3K) activity, but produced no significant long-term changes in the mature hippocampus in the presence of PI3K activity. Interestingly, during PI3K inhibition, insulin did produce LTD in the mature hippocampus. Additionally, insulin induced a long-term decrease in plasma membrane expression of the GluA2 and GluA1 subunits of the AMPAR in the juvenile, but not mature hippocampus. Furthermore, there was a long-term decrease in GluA1 phosphorylation at Serine 845 in the juvenile, but not mature hippocampus. These data reveal that insulin modulation of synaptic plasticity and AMPAR modulation within the hippocampus is age-dependent, suggesting that insulin-regulated behaviors may also show age-dependence. These findings are important largely due to the increased use of insulin as a therapeutic throughout the lifespan. Our data suggest that additional work should be done to determine how this use of insulin throughout different stages of life might affect synaptic function and development.

关键词： Insulin Synaptic Plasticity Synaptic Transmission Long-Term Depression (LTD)

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神经网络侧向测井反演

国外油气勘探 1994年第2期6卷 243-250页

作者： gerardo Garcia 周成当

本文用实倒说明了一种侧向测井反演的神经网络方法。文中所用的倒向测井曲线是采用有限差分方法模拟得到的,模拟曲线用作反传播神经网络的输入。由神经网络产生一个初始预测的地层模型,该模型再用作Marquardt反演的输入。神经网络对实... 详细信息

本文用实倒说明了一种侧向测井反演的神经网络方法。文中所用的倒向测井曲线是采用有限差分方法模拟得到的,模拟曲线用作反传播神经网络的输入。由神经网络产生一个初始预测的地层模型,该模型再用作Marquardt反演的输入。神经网络对实际测井曲线中的总体数据特征和细微的数据特征都作出反应,并产生根据训练过程中存储在网络中的知识推断得到的响应。采用合成数据和现场数据对神经网络侧向测井反演进行检验。根据采用现场数据试算得到的最终地层模型模拟出的侧向测井曲线与实际测井数据吻合较好。

关键词：神经网络侧向测井地层模型测井

Monolithically printed all-organic flexible photosensor active matrix

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npj Flexible Electronics 2023年第1期7卷 504-512页

作者： Luis Arturo Ruiz-Preciado Sanghoon Baek Noah Strobel Kai Xia Mervin Seiberlich Sung-min Park Uli Lemmer Sungjune Jung gerardo Hernandez-Sosa Light Technology Institute Karlsruhe Institute of TechnologyEngesserstr.1376131 KarlsruheGermany InnovationLab Speyererstr.469115 HeidelbergGermany Department of Convergence IT Engineering Pohang University of Science and Technology77 Cheongam-RoPohang 37673Republic of Korea Institute of Microstructure Technology Karlsruhe Institute of TechnologyHermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany Department of Materials Science and Engineering Pohang University of Science and Technology77 Cheongam-RoPohang 37673Republic of Korea

Upcoming technologies in the fields of flexible electronics require the cost-efficient fabrication of complex circuitry in a streamlined *** printing techniques such as inkjet printing can enable such applications thanks to their inherent freedom of design permitting the mask-free deposition of multilayer optoelectronic devices without the need for subtracting *** we present an active matrix sensor array comprised of 100 inkjet-printed organic thin film transistors(OTFTs)and organic photodiodes(OPDs)monolithically integrated onto the same ultrathin *** the OTFTs and OPDs exhibited high-fabrication yield and state-of-the-art performance after the integration *** scaling of the OPDs,we achieved integrated pixels with power consumptions down to 50 nW at one of the highest sensitivities reported to date for an all-organic integrated ***,we demonstrated the application potential of the active matrix by static and dynamic spatial sensing of optical signals.

关键词： matrix printing multilayer

Tentative Identification of Phytochemicals and Antioxidant Activities during Fruit-Ripening on Chamaedorea radicalis Mart.

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Phyton-International Journal of Experimental Botany 2020年第2期89卷 361-373页

作者： gerardo Montelongo-Ruiz Yolanda del Rocio Moreno-Ramirez Maria Cruz Juarez-Aragon NohemiNino-Garcia Reyna Ivonne Torres-Acosta Torres-Castillo Jorge Ariel Universidad Autonoma de Tamaulipas Instituto de Ecologia AplicadaCiudad Victoria87019Mexico Universidad Autonoma de Tamaulipas Unidad Academica Multidisciplinaria ManteCiudad Mante89840Mexico

This work aims to determine the phytochemical characterization of the pericarp of Chamaedorea radicalis *** as a non-timber product with potential to obtain phytochemicals with potential applications in the *** from *** were grouped in four ripening stages named as S1,S2,S3 and S4,according to maturity;S1 the most unripe stage and S4 the completely ripe *** of total phenolic compounds,free radical scavenging activities and total flavonoid contents using spectrophotometric methods were ***,the tentative identification of phytochemicals during fruit ripening was done using *** phenolic compound(TPC)content ranged from 7.24 to 12.53 mg gallic acid equivalents per gram of fresh weight(mg GAE/g FW).Total flavonoids(TF)contents ranged from 0.163 to 0.23 mg of quercetin equivalents per g FW(mg QE/g FW).Free radical scavenging activity against DPPH and ABTS radicals varied from 40.80 to 53.68 and from 22.29 to 37.76 mmol Trolox equivalents g FW(mmol TE/g FW),*** assay in vitro by FRAP(ferric reducing antioxidant power)method showed that S3 was the highest level with antioxidant power while S4 was the lowest with Red ripeness stage showed the lowest contents for all *** spectrometry allowed detection of 26 compounds,including phenolics,alkaloids and ***,Kaempferol 3-neohesperidoside and the four saponins identified were present in all ripeness *** phytochemical identification and the spectrophotometric determinations showed that the pericarp of *** presented antioxidants and compounds related to alkaloids,phenolics and *** presence and abundance of each phytochemical regarding each ripeness stage should be considered.

关键词： Metabolite identification palm free radical scavenging phenolic compounds saponins

Fabrication and testing of polymer-based capacitive micromachined ultrasound transducers for medical imaging

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Microsystems & Nanoengineering 2018年第1期4卷 178-189页

作者： Carlos D.gerardo Edmond Cretu Robert Rohling Department of Electrical and Computer Engineering University of British Columbia2332 Main MallVancouverBCCanada Department of Mechanical Engineering University of British Columbia6250 Applied Science LnVancouverBCCanada

The ultrasonic transducer industry is dominated by piezoelectric *** an emerging alternative,capacitive micromachined ultrasound transducers(CMUTs)offer wider bandwidth,better integration with electronics,and ease of fabricating large *** have a sealed cavity between a fixed electrode and a suspended metalized *** cost and sensitivity are limiting factors in current CMUTs that depend on the fabrication equipment and,especially,on the materials *** widespread use of CMUTs,a much lower fabrication cost that uses inexpensive materials,which maintain or improve upon existing sensitivity,is ***,a new fabrication process is described for polymer-based CMUTs(polyCMUTs)using the photopolymer SU-8 and *** first ultrasound B-mode image of a wire phantom created with a 64-element linear array using synthetic aperture beamforming techniques is presented.A 12 VAC signal superimposed on a 10 VDC signal was used on the transmission side,and only a bias-tee,with no amplifiers,was used on the receiving *** low operational voltage and high sensitivity of this device can be partially attributed to a pre-biasing condition on the *** using a novel sacrificial layer combined with a top electrode embedded inside the membrane,we demonstrated that SU-8 can be used to manufacture CMUTs ***,the fabrication used relatively simple equipment,and the number of fabrication steps was reduced compared to traditional CMUT *** new fabrication process has the potential to increase the use of CMUTs in the ultrasound market,including the market for wearable transducers.

关键词： polymer electrode testing