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Direct laser writing of volumetric gradient index lenses and waveguides

Light(Science & Applications) 2020年第1期9卷 89-102页

作者： Christian r.Ocier Corey A.richards Daniel A.Bacon-Brown Qing Ding raman Kumar Tanner J.Garcia Jorik van de Groep Jung-Hwan Song Austin J.Cyphersmith Andrew rhode Andrea N.Perry Alexander J.Littlefield Jinlong Zhu Dajie Xie Haibo Gao jonah F.Messinger Mark L.Brongersma Kimani C.Toussaint Jr Lynford L.Goddard Paul V.Braun Department of Materials Science and Engineering University of Illinois at Urbana-ChampaignUrbanaILUSA Materials research Laboratory University of Illinois at Urbana-ChampaignUrbanaILUSA Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-ChampaignUrbanaILUSA Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbanaILUSA Department of Materials Science and Engineering Stanford UniversityStanfordCAUSA Carl r.Woese Institute for Genomic Biology University of Illinois at Urbana-ChampaignUrbanaILUSA Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignUrbanaILUSA

Direct laser writing(DLW)has been shown to render 3D polymeric optical components,including lenses,beam expanders,and mirrors,with submicrometer ***,these printed structures are limited to the refractive index and dispersive properties of the ***,we present the subsurface controllable refractive index via beam exposure(SCrIBE)method,a lithographic approach that enables the tuning of the refractive index over a range of greater than 0.3 by performing DLW inside photoresist-filled nanoporous silicon and silica *** the laser exposure during printing enables 3D submicron control of the polymer infilling and thus the refractive index and chromatic *** SCrIBE’s unprecedented index range and 3D writing accuracy has realized the world’s smallest(15μm diameter)spherical Luneburg lens operating at visible ***’s ability to tune the chromatic dispersion alongside the refractive index was leveraged to render achromatic doublets in a single printing step,eliminating the need for multiple photoresins and writing *** also has the potential to form multicomponent optics by cascading optical elements within a *** a demonstration,stacked focusing structures that generate photonic nanojets were fabricated inside porous ***,an all-pass ring resonator was coupled to a subsurface 3D *** measured quality factor of 4600 at 1550 nm suggests the possibility of compact photonic systems with optical interconnects that traverse multiple *** is uniquely suited for constructing such photonic integrated circuits due to its ability to integrate multiple optical components,including lenses and waveguides,without additional printed supports.

关键词： index refractive render

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Determination of α in the Cadmium Lined Irradiation channel of the NIrr-1 for Use in ko-ENAA

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World Journal of Nuclear Science and Technology 2015年第3期5卷 233-240页

作者： F. T. Sheyin M. O. A. Oladipo S. A. jonah U. Sadiq Centre for Energy research and Training Ahmadu Bello University Zaria Nigeria Department of Physics Ahmadu Bello University Zaria Nigeria

The epithermal neutron shape factor (α) was determined in the permanent cadmium lined irradiation channel installed in the large outer irradiation site of the Nigeria research reactor-1 (NIrr- 1) by the cadmium covered multimonitor method using the monitors Al-0.1% Au, Zr and Zn thin foils and Mo thin wire and was found to be -0.137 ± 0.018. The high negative value of α indicates a hardened epithermal neutron spectrum in the cadmium lined irradiation channel. The α value obtained was used in the single comparator method of ENAA (ko-ENAA) for the determination of the concentrations of elements in the standard reference material NIST 1515 Apple leaves using Al-0.1% Au thin foil as the single comparator. The concentrations of the elements Sm and Br were determined in the NIST 1515 Apple leaves because of their high Qo values and are in good agreement with the certified values.

关键词： α Value Cadmium Covered Multimonitor Method Cadmium Lined Irradiation channel ko-ENAA

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YouTube造就歌坛明星

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商业周刊（中文版） 2013年第8期 103-105页

作者： jonah Weiner 贾慧娟(译)

在大唱片公司的帮助下。

关键词： YouTube 明星歌坛唱片公司唱片业

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传染

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作者： (美)乔纳·伯杰(jonah Berger)

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城市如何破坏你的大脑

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英语学习 2009年第7期 15-19页

作者： jonah Lehrer 王翱(选注) 秋叶(评)

看过一个广告公司的统计数字：在美国城市，一般家庭每天接触1518件广告。而这只不过是城市生活的一小部分。考虑到在忙碌的城市里，我们的头脑每天被多少人、物、事所吸引，或者说干扰，现代城市人为何常感到疲惫而空虚也就不难解释了。

关键词：美国城市大脑广告公司统计数字城市生活城市人

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Elemental Analysis of Some Nigerian Food Legumes by ko-ENAA and INAA

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World Journal of Nuclear Science and Technology 2015年第3期5卷 241-251页

作者： F. T. Sheyin M. O. A. Oladipo S. A. jonah U. Sadiq Centre for Energy research and Training Ahmadu Bello University Zaria Nigeria Department of Physics Ahmadu Bello University Zaria Nigeria

Samples of the food legumes, cowpeas (Vigna unguiculata), soya beans (Glycine max) and groundnuts (Arachis hypogaea) collected from rural farmers in four rural villages around Zaria, Nigeria were analysed for the concentrations of the major, minor and trace elements by the ko-ENAA and INAA methods. Irradiation and γ-ray counting were performed using the NIrr-1 and associated facilities. The NIST 1515 Apple leaves were used as the quality control material. The concentrations of the elements Se, Br and rb were determined by ko-ENAA while those of Na, K, Zn, La, Br, Sm and Sc were determined in INAA in the food legumes. The concentrations of Zn found in all the legumes are within the limit specified in international guidelines. The concentrations of Se found in the food legumes are above the limit specified in international guidelines. The food legumes are good sources of the elements Na, K, Zn which can meet adequate dietary requirements provided the legumes are not refined. Bromine is not at toxic levels in the food legumes.

关键词： ko-ENAA of Food Legumes INAA of Food Legumes

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Study of Criticality Safety and Neutronic Performance for a 348-Fuel-Pin Ghana research reactor-1 LEU Core Using MCNP Code

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World Journal of Nuclear Science and Technology 2014年第1期4卷 46-52页

作者： Henry Cecil Odoi Edward H. K. Akaho Sunday A. jonah rex Gyeabour Abrefah Viva Y. Ibrahim Centre for Energy research and Training Ahmadu Bello University Zaria Nigeria National Nuclear research Institute Ghana Atomic Energy Commission Accra Ghana

The National Nuclear research Institute of the Ghana Atomic Energy Commission is undertaking steps to convert the Ghana research reactor-1 from HEU Core to LEU. The proposed LEU core consists of 12.5% enriched UO2 fuel elements clad in Zircaloy-4 alloy. This is done in collaboration with reduced Enrichment for research and Test reactor. The versatile MCNP code was used to analyse the neutronics parameters given in the SAr of HEU core, thereby characterizing the core. Subsequently, the LEU core was indentified with necessary changes to the HEU MCNP model. It was ascertained that the reactivity for the LEU core with the same number of fuel pins as the HEU was inadequate, hence the fuel pins were increased from 344 to 348. The neutron flux at the irradiation sites was found to be below the nominal value at full power for the LEU and hence the nominal power was increased to 34 kW for a nominal flux value of 1 × 1012 n/cm2.s. The parameters investigated for the HEU and LEU are shown in this paper.

关键词： Neutronics Multiplication Factor reactivity Neutron Flux

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疯传

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作者： (美)乔纳·伯杰(jonah Berger)

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Indigenous Fruit Trees of Tropical Africa: Status, Opportunity for Development and Biodiversity Management

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Agricultural Sciences 2015年第1期6卷 31-41页

作者： rasheed Olufemi Awodoyin Oluseun Sunday Olubode Justin Ugochukwu Ogbu rasheed Babatunde Balogun jonah U. Nwawuisi Kalu O. Orji Department of Crop Protection and Environmental Biology University of Ibadan Ibadan Nigeria Department of Horticulture and Landscape Technology Federal College of Agriculture (FCA) Ishiagu Nigeria Department of Pest Management Technology Federal College of Agriculture (FCA) Ishiagu Nigeria Department of Agronomy Michael Okpara University of Agriculture (MOUA) Umuahia Nigeria

Tropical fruit trees constitute important biological resources in the global agrobiodiversity context. Unlike the tropical fruit trees of American and Asian origin, indigenous fruit trees (IFT) of tropical Africa have scarcely achieved the status of international recognition in commodity markets and research arena outside Africa. This paper presented a critical review of the status of IFT in the Tropical African sub-regions (of West Africa, Central Africa, East Africa, Southern Africa and the Indian Ocean Islands) in relation to the introduced naturalised fruit trees from tropical America and Asia, threats to the diversity and sustainable use of IFT, analysis of the opportunities and challenges of developing IFT, as well as targets for crop improvement of the rich IFT of Tropical Africa. Domestication programme via relevant vegetative propagation techniques for priority IFT of the sub-regions was examined and advocated, in addition to the adoption of complementary conservation strategies, including Field GeneBanks in the management of the continent’s IFT diversity.

关键词： Biodiversity Conservation Crop Improvement Domestication Indigenous Fruit Trees Introduced Species Tropical Africa

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催化

催化

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作者： (美)乔纳·伯杰(jonah Berger)

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