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The effect of milling additives on powder properties and sintered body microstructure of NiO

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Journal of Advanced Ceramics 2015年第2期4卷 142-151页

作者： l.jay deiner Michael A.ROTTMAYER Bryan C.EIGENBRODT Department of Chemistry New York City College of TechnologyCity University of New York300 Jay St.BrooklynNY 11201USA The Air Force Research labs Wright-Patterson Air Force BaseOH 45433USA Department of Chemistry Villanova University800 E.Lancaster Ave.VillanovaPA 19085USA

The evolution of powder particle size,crystal structure,and surface chemistry was evaluated for micron scale NiO powders subjected to impact milling with commonly employed milling additives:methanol,Vertrel XF,and amorphous *** effect of the different comminution protocols on sintered body microstructure was evaluated for high temperature sintering in inert atmosphere(N_(2)).X-ray photoelectron spectroscopy showed that NiO powder surface chemistry is surprisingly sensitive to milling additive *** particular,the proportion of powder surface defect sites varied with additive,and methanol left an alcohol or alkoxy residue even after *** sintering to intermediate temperatures(1100℃),scanning electron microscopy(SEM)showed that slurry milled NiO powders exhibit hindered sintering *** effect was amplified for NiO milled with methanol,in which sub-500 nm grain sizes dominated even after sintering to 1100℃.Upon heating to high temperatures(1500℃),simultaneous differential scanning calorimetry/thermogravimetric analysis(DSC/TGA)showed that the powders containing carbon residues undergo carbothermal reduction,resulting in a melting transition between 1425 and 1454℃.Taken together,the results demonstrated that when processing metal oxide powders for advanced ceramics,the choice of milling additive is crucial as it exerts significant control over sintered body microstructure.

关键词： nickel oxide impact milling sintering densification grain growth

Optical enhancement effects of plasmonic nanostructures on organic photovoltaic cells

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Chinese Chemical letters 2015年第4期26卷 419-425页

作者： Hui Joon Park l.jay Guo Division of Energy Systems Research Ajou University Department of Electrical Engineering and Computer Science University of Michigan

In this article, the optical enhancement effects of plasmonic nanostructures on OPV cells were reviewed as an effective way to resolve the mismatch problems between the short exciton diffusion length in organic semiconductors （around 10 nm） and the large thickness required to fully absorb sunlight （e.g. hundreds of nanometers）. Especially, the performances of OPVs with plasmonic nanoparticles in photoactive and buffer layers and with periodic nanostructures were investigated. Furthermore, nanoimprint lithography-based nanofabrication processes that can easily control the dimension and uniformity of structures for large-area and uniform I^lasmonic nanostructures were demonstrated.

关键词： Organic photovoltaicPlasmonic nanostructureNanoparticleNanogratingNanoimprint lithography

Benchmarking deep learning-based models on nanophotonic inverse design problems

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Opto-Electronic Science 2022年第1期1卷 37-51页

作者： Taigao Ma Mustafa Tobah Haozhu Wang l.jay Guo Department of Physics The University of MichiganAnn ArborMichigan48109USA Department of Materials Science and Engineering The University of MichiganAnn ArborMichigan48109USA Department of Electrical Engineering and Computer Science The University of MichiganAnn ArborMichigan48109USA

Photonic inverse design concerns the problem of finding photonic structures with target optical ***,traditional methods based on optimization algorithms are time-consuming and computationally ***,deep learning-based approaches have been developed to tackle the problem of inverse design *** most of these neural network models have demonstrated high accuracy in different inverse design problems,no previous study has examined the potential effects under given constraints in ***,the relative strength of different deep learning-based inverse design approaches has not been fully ***,we benchmark three commonly used deep learning models in inverse design:Tandem networks,Variational Auto-Encoders,and Generative Adversarial *** provide detailed comparisons in terms of their accuracy,diversity,and *** find that tandem networks and Variational Auto-Encoders give the best accuracy,while Generative Adversarial Networks lead to the most diverse *** findings could serve as a guideline for researchers to select the model that can best suit their design criteria and fabrication *** addition,our code and data are publicly available,which could be used for future inverse design model development and benchmarking.

关键词： inverse design photonics machine learning neural networks generative models

Inverse design of metasurface optical filters using deep neural network with highdegrees of freedom

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InfoMat 2021年第4期3卷 432-442页

作者： Xiao Han Ziyang Fan Zeyang liu Chao li l.jay Guo Department of Electrical Engineering and Computer Science The University of MichiganAnn ArborMichigan Department of Information Science and Electronic Engineering Zhejiang UniversityHangzhouChina

In order to obtain a metasurface structure capable of filtering light of a specific wavelength range in the visible band,the traditional methods usually traverse the space consisting of possible designs,searching for a potenti ally satisfactory structure by performing iterative calculations to solve Maxwell's *** this article,we propose a systematic method based on neural networks that can complete an inverse design process to solve the *** with the traditional methods,our method is much faster while competent to encom-pass a high degree of freedom to generate device structures,which can ensure that the spectra of generated structures resemble the desired ones.

关键词： high degrees of freedom metasurface filter neural network visible band

Decorative near-infrared transmission filters featuring high-efficiency and angular-insensitivity employing ID photonic crystals

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Nano Research 2019年第3期12卷 543-548页

作者： Chengang Ji Chenying Yang Weidong Shen Kyu-Tae lee Yueguang Zhang Xu liu l.jay Guo Department of Electrical Engineering and Computer Science The University of Michigan Ann Arbor Michigan 48109 USA State Key laboratory of Modern Optical Instrumentation Department of Optical Engineering Zhejiang University Hangzhou 310027 China Department of Physics Inha University Incheon 22212 Republic of Korea

We present a new scheme for visibly-opaque but near-infrared-transmitting filters involving 7 layers based on one-dimensional ternary photonic crystals, with capabilities in reaching nearly 100% transmission efficiency in the near-infrared region. Different decorative reflection colors can be created by adding additional three layers while maintaining the near-infrared transmission performance. In addition, our proposed structural colors show great angular insensitivity up to ±60° for both transverse electric and transverse magnetic polarizations, which are highly desired in various fields. The facile strategy described here involves a simple deposit!on method for the fabrication, thereby having great potential in diverse applications such as image sensors, anti-counterfeit tag, and optical measurement systems.

关键词： near-infrared (NIR)-transmitting filters colored decorations photonic crystals multilayer structures

Adding Value to Crop Production Systems by Integrating Forage Cover Crop Grazing

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American Journal of Plant Sciences 2024年第3期15卷 180-192页

作者： Robert B. Mitchell Daren D. Redfearn Kenneth P. Vogel Terry J. Klopfenstein Galen Erickson P. Stephen Baenziger Bruce E. Anderson Mary E. Drewnoski jay Parsons Steven D. Masterson Marty R. Schmer Virginia l. Jin USDA-ARS Wheat Sorghum and Forage Research Unit University of Nebraska-Lincoln Lincoln NE USA Department of Agronomy and Horticulture University of Nebraska-Lincoln Lincoln NE USA Department of Animal Science University of Nebraska-Lincoln Lincoln NE USA Department of Agricultural Economics University of Nebraska-Lincoln Lincoln NE USA USDA-ARS Agroecosystem Management Research Unit University of Nebraska-Lincoln Lincoln NE USA

In addition to their value as cereal grains, wheat (Triticum aestivum l.) and triticale (× Triticosecale Wittmack) are important cool-season annual forages and cover crops. Yearling steer (Bos taurus) performance was compared in the spring following autumn establishment as for age cover crops after soybean [Glycine max (l.) Merr.] grain harvest. Replicated pastures (0.4 ha) were no-till seeded in three consecutive years into soybean stubble in autumn, fertilized, and grazed the following spring near Ithaca, NE, USA. Each pasture (n = 3) was continuously stocked in spring with four yearling steers (380 ± 38 kg) for 17, 32, and 28 d in 2005, 2006, and 2007, respectively. In 2005, average daily gain (ADG) for steers grazing triticale exceeded the ADG for wheat by 0.31 kghd-1d-1. In 2006, wheat ADG exceeded that for triticale by 0.12 kghd-1d-1. In 2007, steers grazing wheat lost weight, while steers grazing triticale gained 0.20 kghd-1d-1. Based on the 3-year average animal gains valued at $1.32 kg-1, mean net return ($ ha-1 yr-1) was $62.15 for triticale and $22.55 for wheat. Since these grazed cover crops provide ecosystem services in addition to forage, grazing could be viewed as a mechanism for recovering costs and adds additional value to the system. Based on this 3-year grazing trial, triticale was superior to wheat and likely will provide the most stable beef yearling performance across years with variable weather for the western Cornbelt USA.

关键词： Cover crops Soybean Triticale Wheat

Quasi-vertical tapers for polymer-waveguide-based interboard optical interconnects

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Photonics Research 2015年第6期3卷 317-323页

作者： Zeyu Pan Harish Subbaraman Yi Zou Xiaochuan Xu Xingyu Zhang Cheng Zhang Qiaochu li l.jay Guo Ray T.Chen Microelectronic Research Center Department of Electrical and Computer EngineeringThe University of Texas at AustinAustinTexas 78758USA Omega Optics Inc.8500 Shoal Creek BlvdAustinTexas 78757USA Department of Electrical Engineering and Computer Science University of Michigan1301 Beal AveAnn ArborMichigan 48109USA

A mode transformer based on the quasi-vertical taper is designed to enable high coupling efficiency for interboardlevel optical interconnects involving single-mode polymer waveguides and standard single-mode fibers. A triangular region fabricated above the waveguide is adopted to adiabatically transform the mode from the fiber into the polymer waveguide. The effects of the geometrical parameters of the taper, including width, height, tip width,etc., on the coupling efficiency are numerically investigated. Based on this, a quasi-vertical taper for the polymer rib waveguide system is designed, fabricated, and characterized. Coupling losses of 1.79 0.30 and 2.23 0.31 dB per coupler for the quasi-TM and quasi-TE mode, respectively, are measured across the optical communication C and l bands(1535 to 1610 nm). low-cost packaging, leading to widespread utilization of polymeric photonicdevices, is envisioned for optical interconnect applications.

关键词： mode MFD Quasi-vertical tapers for polymer-waveguide-based interboard optical interconnects TE

long-term outcomes in patients initially responsive to selective laser trabeculoplasty

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International Journal of Ophthalmology(English edition) 2015年第5期8卷 960-964页

作者： Varun Patel Eman El Hawy Michael Waisbourd Camila Zangalli Daniel M.Shapiro lalita Gupta Michael Hsieh Abigail Kasprenski l.jay Katz George l.Spaeth Glaucoma Research Center Wills Eye Hospital

AIMTo determine the long-term effects of selective laser trabeculoplasty (SlT) on intraocular pressure (IOP) and the number of medications used up to 5y following treatment in glaucoma patients receiving maximally tolerated medical therapy (MTMT).METHODSThe Wills Eye Hospital Glaucoma Research Center retrospectively reviewed the charts of glaucoma patients who underwent SlT after receiving MTMT. Eyes that did not achieve their target pressure within 3mo following SlT were excluded from the study. Changes in mean IOP and number of glaucoma medications used were analyzed at 1, 3, and 5y following ***-five eyes of 67 patients were included in the study. Fifteen eyes that received SlT failed to achieve their target pressure within 3mo and were excluded from the study. The average follow-up time was 37.4mo (±14.4). Mean IOP was significantly reduced 1y after treatment (P=0.005). It was also reduced 3, 5y after treatment without reaching statistical significance (P=0.20 and P=0.072, respectively). There was a significant decrease in mean number of medications used 1, 3, 5y after treatment (Ply). In the span of 5y, 2 eyes (2.7%) underwent repeat SlT, 7 eyes (9.3%) underwent glaucoma surgery and an additional 3 eyes (4.0%) underwent *** significantly reduced the number of glaucoma medications used 5y following treatment in glaucoma patients receiving MTMT. SlT may delay operating-room surgery.

关键词： selective laser trabeculoplasty long-term intraocular pressure number of medications used maximally tolerated medical therapy glaucoma

Validation and reproducibility of the Heidelberg Edge Perimeter in the detection of glaucomatous visual field defects

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International Journal of Ophthalmology(English edition) 2019年第4期12卷 577-581页

作者： Qi N.Cui Priyanka Gogt Jonathan M.lam Safa Siraj lisa A.Hark Jonathan S.Myers l.jay Katz Michael Waisbourd Glaucoma Research Center Wills Eye Hospital Scheie Eye Center University of Pennsylvania Department of Ophthalmology Tel Aviv Sourasky Medical Center affiliated to the Sackler Faculty of Medicine Tel Aviv University

AIM: To validate the ability of the Heidelberg Edge Perimeter(HEP) in detecting glaucomatous visual field(VF) defects compared to the Octopus Visual Field(OVF) Analyzer and to determine the test-retest repeatability of both ***: This prospective, cross-sectional study was conducted at Wills Eye Hospital, Philadelphia, PA. Glaucoma subjects and unaffected controls underwent VF testing using HEP standard automated perimetry(SAP) Ⅲ 30-2 Adaptive Staircase Thresholding Algorithm(ASTA) FAST protocol and OVF G-TOP white-on-white strategy. Testing order was randomized. Pearson's correlation coefficient was calculated for both mean deviation(MD) and pattern standard deviation/square root of loss of variance(PSD/s lV). Receiver operating characteristic(ROC) curves were used to determine the diagnostic abilities of both modalities. Glaucoma subjects returned for repeat testing and intraclass correlation coefficients(ICCs) were calculated to assess test-retest repeatability. RESUlTS: Seventy-nine subjects with glaucoma and 36 unaffected controls were enrolled. HEP and OVF were significantly correlated for both MD(r=-0.84; PlV(r=0.79; Plso comparable between HEP and OVF for both MD(0.74 and 0.79, respectively; P=0.26) and PSD/sl V(0.74 and 0.82; P=0.08). ICC was high for both HEP (0.96 for MD, 0.95 for PSD/s lV) and OVF(0.82 and 0.88, respectively). Mean test duration(min) was significantly shorter for OVF(2.63) compared to HEP(5.15; PlUSION: HEP and OVF show strong correlation for both MD and PSD/s lV, and have similar validity for detecting glaucoma. The test-retest repeatability is high for both HEP and OVF, however the average testing duration of HEP is significantly longer than that of OVF.

关键词： glaucoma Heidelberg Edge Perimeter standard automated perimetry Octopus Visual Field Analyzer visual field