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3GPP LtE的预编码和空间多路复用MIMO技术

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电子产品世界 2009年第9期16卷 14-16,20页

作者： Randall t.becker 安捷伦科技

当多路径信道在一个或多个MIMO接收机上无法提供足够的SINR时,3GPPLtE中的预编码技术可以极大地提高系统性能。测试结果表明,各种测量均可在多路径和信道失真条件下,对预编码系统的操作和性能进行非常有用的深入分析。

关键词： 3GPP LtE MIMO 预编码无线测试

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temperature Difference and Stack Plate Spacing Effects on thermodynamic Performances of Standing-Wave thermoacoustic Engines Driven by Cryogenic Liquids and Waste Heat

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Journal of thermal Science 2022年第5期31卷 1434-1451页

作者： GUO Lixian ZHAO Dan becker Sid Department of Mechanical Engineering College of EngineeringUniversity of CanterburyPrivate Bag 4800Christchurch8041New Zealand

the standing-wave thermoacoustic engines(tAE)are applied in practice to convert thermal power into acoustic one to generate electricity or to drive cooling *** there is a number of existing numerical researches that provides a design tool for predicting standing-wave tAE performances,few existing works that compare tAE driven by cryogenic liquids and waste heat,and optimize its performance by varying the stack plate *** present work is primarily concerned with the numerical investigation of the performance of tAEs driven by cryogenic liquids and waste *** this,three-dimensional(3-D)standing-wave tAE models are ***-and time-independence studies are conducted *** validations are then performed by comparing with the numerical results available in the *** validated model is then applied to simulate the standing-wave tAEs driven by the cryogenic liquids and the waste heat,as the temperature gradientΔt is *** is found that limit cycle oscillations in both systems are successfully generated and the oscillations amplitude is increased with increasedΔ*** is identified with acoustic streaming and the flow reversal occurring through the *** studied are then conducted between the cryogenic liquid-driven tAE and that driven by waste heat in the presence of the same temperature gradientΔ*** is shown that the limit cycle frequency of the cryogenic liquid system is 4.72%smaller and the critical temperatureΔt_(cri)=131 K is lower than that of the waste heat system(Δt_(cri)=187 K).Furthermore,the acoustic power is increased by 31%and the energy conversion efficiency is found to increase by 0.42%.Finally,optimization studies on the stack plate spacing are conducted in tAE system driven by cryogenic *** is found that the limit cycle oscillation frequency is increased with the decreased ratio between the stack plate spacing and the heat penetration *** the ratio is set to between 2 and

关键词： thermoacoustic engine standing-wave cryogenic thermodynamics acoustical energy plate spacing heat transfer acoustic streaming

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Acoustofluidic separation enables early diagnosis of traumatic brain injury based on circulating exosomes

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Microsystems & Nanoengineering 2021年第2期7卷 59-69页

作者： Zeyu Wang Haichen Wang Ryan becker Joseph Rufo Shujie Yang Brian E.Mace Mengxi Wu Jun Zou Daniel t.Laskowitz tony Jun Huang Department of Mechanical Engineering and Materials Science Duke UniversityDurhamNC27708USA Department of Neurology Duke UniversityDurhamNC27708USA Department of Biomedical Engineering Duke UniversityDurhamNC27708USA Department of Geriatrics Duke UniversityDurhamNC27708USA Department of Electrical&Computer Engineering Texas A&M UniversityCollege StationTX77840USA

traumatic brain injury(tBI)is a global cause of morbidity and *** management and risk stratification of patients with tBI is made difficult by the relative insensitivity of screening radiographic studies as well as by the absence of a widely available,noninvasive diagnostic *** particular,a blood-based biomarker assay could provide a quick and minimally invasive process to stratify risk and guide early management strategies in patients with mild tBI(mtBI).Analysis of circulating exosomes allows the potential for rapid and specific identification of tissue *** applying acoustofluidic exosome separation—which uses a combination of microfluidics and acoustics to separate bioparticles based on differences in size and acoustic properties—we successfully isolated exosomes from plasma samples obtained from mice after *** isolation eliminated interference from other blood components,making it possible to detect exosomal biomarkers for tBI via flow *** cytometry analysis indicated that exosomal biomarkers for tBI increase in the first 24 h following head trauma,indicating the potential of using circulating exosomes for the rapid diagnosis of *** levels of tBI biomarkers were only detected in the samples separated via acoustofluidics;no changes were observed in the analysis of the raw plasma *** finding demonstrated the necessity of sample purification prior to exosomal biomarker *** acoustofluidic exosome separation can easily be integrated with downstream analysis methods,it shows great potential for improving early diagnosis and treatment decisions associated with tBI.

关键词： diagnosis separation injury

Improving the haploidization toolbox:Maternal factors take the stage

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Molecular Plant 2023年第4期16卷 651-653页

作者： Maria Flores-tornero Helena Sapeta Jorg D.becker Instituto de tecnologia Quimica e Biologica Universidade Nova de LisboaAv.daRepublica2780-157OeirasPortugal

Plant breeders have a great interest in obtaining plants that are genetically homogeneous as quickly as possible,with high efficiency and at low *** approaches,including selfing or backcrossing,cannot provide *** technologies,however,offer a solution and are therefore the subject of intensive research,in particular during the last decade.

关键词： breed homogeneous quickly

Condensation of pyrylium salts with mixed anhydrides:aryl ethers,aryl amines and sterically congested aromatics

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Organic Chemistry Frontiers 2022年第2期9卷 294-298页

作者： Daniel Grabowski Susanne Alef Steven becker Ute Muller Gregor Schnakenburg Sigurd Hoger aKekulé-Institut für Organische Chemie und Biochemie Rheinische Friedrich-Wilhelms-Universität BonnGerhard-Domagk-Str.153121 BonnGermany bInstitut für Anorganische Chemie Universität BonnGerhard-Domagk-Str.153121 BonnGermany

the condensation of easily accessible and widely functionalizable 2,4,6-triaryl pyrylium salts with mixed anhydrides,formed in situ fromα-functionalized sodium acetates and an anhydride solvent,leads in good yields to the corresponding 2,4,6-triaryl benzenes functionalized at their 1-position.4-(trifluoromethyl)benzoic anhydride has been proven as being the solvent of choice and ortho-disubstituted diphenyl ethers,triphenyl amines and phenyl carbazoles with different functionalizations are *** addition,sterically hindered anthracene diacetate is condensed with two bis-bromophenyl pyrylium salts which leads after intramolecular Yamamoto coupling to *** these,the anthracene core is surrounded by phenylenes and protected from photooxidation,leading to a highly stable blue emitting material.

关键词： material. anhydride salts

Role of receptor tyrosine kinases in gastric cancer: New targets for a selective therapy

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World Journal of Gastroenterology 2006年第21期12卷 3297-3305页

作者： JC becker C Müller-tidow H Serve W Domschke t Pohle Department of Medicine B University of Münster D-48129 MünsterGermany Department of Medicine A University of Münster D-48129 MünsterGermany

Receptor tyrosine kinases （RtKs） such as the epidermal growth factor receptor family participate in several steps of tumor formation including proliferation and metastatic spread. Several known RtKs are upregulated in gastric cancer being prime targets of a tailored therapy. Only preliminary data exist, however, on the use of the currently clinically available drugs such as trastuzumab, cetuximab, bevacizumab, gefitinib, erlotinib, and imatinib in the setting of gastric cancer. Preclinical data suggest a potential benefit of their use, especially in combination with ＂conventional＂ cytostatic therapy. this review summarizes the current knowledge about their use in cancer therapy as well as new approaches and drugs to optimize treatment success.

关键词： Gastric carcinoma EGFR Gefitinib trastuzumab Cetuximab Imatinib Erlotinib Bevacizumab

Crohn's disease complicated by intestinal infection with methicillin-resistant Staphylococcus aureus

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World Journal of Gastroenterology 2013年第27期19卷 4418-4421页

作者： Dominik Bettenworth tobias M Nowacki Alexander Friedrich Karsten becker Johannes Wessling Jan Heidemann Department of Medicine B University of Münster Institute of Hygiene University of Münster Institute of Medical Microbiology University of Münster Department of Clinical Radiology University of Münster

We report on a 24-year-old male patient with history of bloody diarrhea, abdominal pain and vomiting. Endoscopy revealed massive ulcerative discontinuous proctosigmoiditis with deep, sharply demarcated epithelial denudations and enterotoxigenic methicillin-resistant Staphylococcus aureus (MRSA) was detected in mucosal biopsies. After treatment with linezolide and steroids, a significant amelioration of colitis was detected and testing for MRSA became negative. In face of the case presented here, we suggest that in patients with refractory inflammatory bowel disease (IBD), microbiological assessment should be performed to detect a possible Staphylococcus aureus infection in order to initiate an antimicrobial treatment in addition to IBDspecific treatment.

关键词： Inflammatory bowel disease Crohn’s disease Infectious colitis Staphylococcus aureus Methicillin-resistant Staphylococcus aureus

transcriptomic responses to drought stress in the Patagonian southern beech Nothofagus alpina

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Ecological Processes 2024年第2期13卷 192-203页

作者： Rita Maria Lopez Laphitz María Verónica Arana Santiago Agustín Varela Leandro Aníbal becker Carolina Soliani María Marta Azpilicueta Paula Marchelli Nicolás Bellora Instituto de Diversidad y Evolución Austral (CENPAt CONICEt ) Instituto de Investigaciones Forestales y Agropecuarias Bariloche (IFAB INtA CONICEt ) Instituto de tecnologías Nucleares para la Salud (CONICEt )

Background Deciphering the genetic architecture of drought tolerance could allow the candidate genes identification responding to water stress. In the Andean Patagonian forest, the genus Nothofagus represents an ecologically relevant species to be included in different genomic studies. these studies are scarce in South American ecosystems however represent an important source of genomic data in order to interpret future climate-change environment scenarios of these emblematic forests. Here, we achieved the assemblage of the transcriptome of N. alpina while searching for key genes of activated or suppressed metabolic pathways in response to drought *** De novo transcriptome assembly resulted in 104,030 transcripts. Following confirmation of drought conditions, based on reduction of leaf water potential and stomatal conductance, a differential gene expression analysis resulted in 2720 significantly expressed genes(1601 up-regulated and 1119 down-regulated). Enrichment analysis(over-representation analysis and gene set enrichment analysis) resulted in more than one hundred stress-responsive term ontologies(i.e. biological processes) and pathways. terms such as response to abscisic acid and pathways such as plant hormone signal transduction or starch and sucrose metabolism were over-represented. Protein–protein interaction assessment resulted in networks with significantly expressed top common hub gene clusters(e.g. planttype cell wall biogenesis among down-regulated or ABA-signalling among up-regulated). these networks evidenced important regulators at gene expression such as transcriptional *** Responses of N. alpina seedlings to drought stress were evidenced by the activation of several genes linked to GO biological processes and KEGG pathways, which were mainly based on over-expression of specific protein kinases, phosphatases, synthases and transcription factors. this suggests an up-regulation of signalling pathways, triggered through pla

关键词： Climate change Differential gene expression Hub genes Patagonia temperate forest

Creating a‘planning emergency levels of service’framework-a silver bullet,or something useful for target practice?

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Resilient Cities and Structures 2023年第2期2卷 1-12页

作者： R.Mowll J.becker L.Wotherspoon C.Stewart D.Johnston D.Neely Wellington Lifelines Group New Zealand Joint Centre for Disaster Research Massey UniversityNew Zealand the University of Auckland New Zealand College of Heath Massey UniveristyNew Zealand School of Psychology Massey UniversityNew Zealand Wellington Region Emergency Management Office New Zealand

‘Planning Emergency Levels of Service’(PELOS)are service delivery goals for infrastructure providers during and after an emergency *** goals could be delivered through the existing infrastructure(e.g.,pipes,lines,cables),or through other means(trucked water or the provision of generators).this paper describes how an operationalised framework of PELOS for the Wellington region,New Zealand was created,alongside the key *** undertook interviews and workshops with critical infrastructure entities to create the *** this process we found five themes that informed the context and development of the PELOS framework:interdependencies between critical infrastructure,the need to consider the vulnerabilities of some community members,emergency planning considerations,stakeholders’willingness to collaborate on this re-search/project and the flexibility/adaptability of the delivery of infrastructure services following a major *** themes are all explored in this *** research finds that the understanding of the hazardscape and potential outages from hazards is critical and that co-ordination between key stakeholders is essential to create such a *** paper may be used to inform the production of PELOS frameworks in other localities.

关键词： Infrastructure Resilience Recovery Emergency management