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Light correcting light with nonlinear optics

Advanced Photonics 2024年第2期6卷 41-49页

作者： Sachleen Singh Bereneice Sephton Wagner Tavares Buono Vincenzo D'Ambrosio thomas konrad.and.ew forbes University of the Witwatersrand School of Physics Università degli studi di Napoli “Federico Ⅱ” Dipartimento di Fisica “E.Pancini” University of Kwa Zulu-Natal School of Chemistry and Physics

Structured light, where complex optical fields are tailored in all their degrees of freedom, has become highly topical of late, advanced by a sophisticated toolkit comprising both linear and nonlinear *** undesired structure from light is far less developed, leveraging mostly on inverting the distortion,e.g., with adaptive optics or the inverse transmission matrix of a complex channel, both requiring that the distortion be fully characterized through appropriate measurement. We show that distortions in spatially structured light can be corrected through difference-frequency generation in a nonlinear crystal without any need for the distortion to be known. We demonstrate the versatility of our approach using a wide range of aberrations and structured light modes, including higher-order orbital angular momentum(OAM) beams,showing excellent recovery of the original undistorted field. To highlight the efficacy of this process, we deploy the system in a prepare-and-measure communications link with OAM, showing minimal cross talk even when the transmission channel is highly aberrated, and outline how the approach could be extended to alternative experimental modalities and nonlinear processes. Our demonstration of light-correcting light without the need for measurement opens an approach to measurement-free error correction for classical and quantum structured light, with direct applications in imaging, sensing, and communication.

关键词： phase conjugation aberration correction orbital angular momentum nonlinear optics

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飞蜂窝基站实现了家庭无线互连

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今日电子 2009年第3期 42-43页

作者： thomas Cameron Peadar forbes ADI公司

可以想象有一种设备，它能够在家庭范围内提供高质量的电话服务，允许家庭成员之间不受限制地进行语音和数据交流，而每月只需要很低的费用。Femto基站通常是指飞蜂窝（Femtocell，也称为毫微微小区），它具有很多功能。这种小型无线设... 详细信息

可以想象有一种设备，它能够在家庭范围内提供高质量的电话服务，允许家庭成员之间不受限制地进行语音和数据交流，而每月只需要很低的费用。Femto基站通常是指飞蜂窝（Femtocell，也称为毫微微小区），它具有很多功能。这种小型无线设备放置在家庭或办公室内，可以提高本地无线覆盖。

关键词：家庭成员蜂窝基站无线互连无线设备电话服务数据交流无线覆盖微小区

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Bowen Ratio Energy Balance Measurement of Carbon Dioxide (CO<sub>2</sub>) Fluxes of No-Till and Conventional Tillage Agriculture in Lesotho

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Open Journal of Soil Science 2014年第3期4卷 87-97页

作者： Deb O’Dell thomas J. Sauer Bruce B. Hicks Dayton M. Lambert David R. Smith Wendy Bruns August Basson Makoala V. Marake forbes Walker Michael D. Wilcox Jr. Neal Samuel Eash Department of Agricultural & Resource Economics University of Tennessee Knoxville USA Institute of Agriculture University of Tennessee Knoxville USA KEL Growing Nations Trust Mohaleshoek Lesotho MetCorps Norris USA United States Department of Agriculture (USDA) Agriculture Research Service (ARS) Ames USA Purdue University West Lafayette USA

Global food demand requires that soils be used intensively for agriculture, but how these soils are managed greatly impacts soil fluxes of carbon dioxide (CO2). Soil management practices can cause carbon to be either sequestered or emitted, with corresponding uncertain influence on atmospheric CO2 concentrations. The situation is further complicated by the lack of CO2 flux measurements for African subsistence farms. For widespread application in remote areas, a simple experimental methodology is desired. As a first step, the present study investigated the use of Bowen Ratio Energy Balance (BREB) instrumentation to measure the energy balance and CO2 fluxes of two contrasting crop management systems, till and no-till, in the lowlands within the mountains of Lesotho. Two BREB micrometeorological systems were established on 100-m by 100-m sites, both planted with maize (Zea mays) but under either conventional (plow, disk-disk) or no-till soil mangement systems. The results demonstrate that with careful maintenance of the instruments by appropriately trained local personnel, the BREB approach offers substantial benefits in measuring real time changes in agroecosystem CO2 flux. The periods where the two treatments could be compared indicated greater CO2 sequestration over the no-till treatments during both the growing and non-growing seasons.

关键词： CO2 Flux CO2 Emissions Soil Soil Carbon Tillage Till No-Till Bowen Ratio Micrometeorology Agriculture Climate Change Lesotho Africa

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Noongar文化环境中心

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现代装饰 2020年第2期 24-31页

作者： Finn Pedersen Adrian Iredale Martyn Hook Joel Fuller Leo Showell Catherine Dupuy Mary McAree Craig Nener Rebecca HAwkett thomas forbes Peter Bennetts(摄影) 李薇(编译) 无不详 lredale Pedersen Hook Architects

1833年Ballardong Noongar居民因遭受激烈的血腥镇压而被刊登于公报,1841年各方关系趋向平和。而1905年,政府出台《原住居民法案》,允许国家完全"保护、控制和隔离原住居民"。1933年,镇上所有原住民被流放到摩尔河原住民聚居地--约200... 详细信息

1833年Ballardong Noongar居民因遭受激烈的血腥镇压而被刊登于公报,1841年各方关系趋向平和。而1905年,政府出台《原住居民法案》,允许国家完全"保护、控制和隔离原住居民"。1933年,镇上所有原住民被流放到摩尔河原住民聚居地--约200公里外的另一个"国家"。直到1954年,造就这种情况的法律才被废除,Ballardong Noongar人才回到镇上。2016年夏尔市议会获得资金,希望建立一个新的文化中心,以支持Ballardong Noongar人。该项目工作组由该地区的老人和主要家庭的代表组成,他们与设计团队直接合作,生成建筑概念,并决定Noongar文化环境中心的运作以及Noongar文化的呈现方式。IPH建筑事务所和设计师Thylacine担纲了本案的设计,与原住民社区共同合作,设计出了一个能够教授土著居民和非土著居民关于Noongar文化和环境的地方。

关键词：建筑事务所土著居民建筑概念原住居民市议会呈现方式 Ball 原住民社区

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Quasi-likelihood techniques in a logistic regression equation for identifying Simulium damnosum *** habitats intra-cluster covariates in Togo

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Geo-Spatial Information Science 2012年第2期15卷 117-133页

作者： Benjamin G.JACOB Robert J.NOVAK Laurent TOE Moussa S.SANFO Abena N.AFRIYIE Mohammed A.IBRAHIM Daniel A.GRIFFITH thomas R.UNNASCH Global Infectious Disease Research Program Department of Public HealthCollege of Public HealthUniversity of South Florida3720 Spectrum BlvdSuite 304TampaFL 33612USA Onchocerciasis Control Programme(OCP) B.P.1473 Avenue NorteZombreSector 8OuagadougouBurkina FasoWest Africa Department of Chemistry University of Pittsburg3260 Forbes AvenueFirst FloorUSA Department of Biology Wake Forest University226 Winston HallBox 7325 Reynolda StationWinston-SalemNC 27109USA School of Economic and Policy Sciences The University of Texas at Dallas800 West Campbell RoadRichardsonTX 75080-3021USA

The standard methods for regression analyses of clustered riverine larval habitat data of Simulium damnosum s.l.a major black-fly vector of onchoceriasis,postulate models relating observational ecological-sampled parameter estimators to prolific habitats without accounting for residual intra-cluster error correlation ***,this correlation comes from two sources:(1)the design of the random effects and their assumed covariance from the multiple levels within the regression model and(2)the correlation structure of the ***,inconspicuous errors in residual intracluster correlation estimates can overstate precision in forecasted *** *** larval habitat explanatory attributes regardless how they are treated(***,autoregressive,Toeplitz,etc.).In this research,the geographical locations for multiple riverine-based *** *** ecosystem habitats sampled from two preestablished epidemiological sites in Togo were identified and recorded from July 2009 to June ***,the data were aggregated into PROC *** agglomerative hierarchical residual cluster-based analysis was then *** sampled clustered study site data was then analyzed for statistical correlations using monthly biting rates(MBR).Euclidean distance measurements and terrain-related geomorphological statistics were then generated in ArcGIS.A digital overlay was then performed also in ArcGIS using the georeferenced ground coordinates of high and low density clusters stratified by annual biting rates(ABR).The data was overlain onto multitemporal sub-meter pixel resolution satellite data(*** 0.61m wavbands).Orthogonal spatial filter eigenvectors were then generated in SAS/Geographic Information Systems(GIS).Univariate and nonlinear regression-based models(***,Poisson,and negative binomial)were also employed to determine probability distributions and to identify statistically significant parameter estimators from the

关键词： Simulium damnosum s.l.cluster covariates QuickBird Onchoceriasis Annual biting rates Bayesian Togo

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