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Particuology 2017年第1期15卷 92-101页

作者： Bellamarie ludwia Jennifer l. gray Applied Research laboratory The Pennsylvania State University North Atherton Street State College PA 16801 USA Materials Research Institute The Pennsylvania State University USA

Aluminum particles were exposed to gaseous polydimethylsiloxane （PDMS） to produce a hydropho- bic surface coating for enhanced flow and fluidity. Surface retention of the intact PDMS was confirmed through infrared and X-ray photoelectron spectroscopy. Transmission electron microscopy was used to image cross-sections of the treated particles and energy dispersive spectroscopy element maps demon- strated the presence of a surface layer consisting of silicon and oxygen. Density measurements provided evidence for improvements in the Hausner ratio and Carr index of the PDMS-treated aluminum, indicating a reduction in inter-particulate cohesion through increased bulk density. Stability, compressibility, shear, aeration, and permeability of the particles were assessed by powder rheometer. The compressibility was reduced by approximately 32% following surface treatment, revealing a reduction in void space, while Mohr＇s circle analysis and shear testing determined that the extrapolated cohesion value was reduced by approximately 53% and the flow factor at 6 kPa was doubled. Aeration testing showed that the air velocity required to obtain a fluidized bed was on the order of 0.35 mm/s for the treated powder, whereas the raw powder could not be uniformly fluidized. PDMS may be a viable option for the large-scale treatment of aluminum powder for flow applications.

关键词： Aluminum powder Polydimethylsiloxane X-ray photoelectron spectroscopy Diffuse reflectance infrared Fourier transform spectroscopy Flowability FT4 powder rheometer

Dish-like higher-ordered palladium nanostructures through metal ion-ligand complexation

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Nano Research 2018年第6期11卷 3442-3452页

作者： Xi Yin Miao Shi Kam Sang Kwok Haidong Zhao Danielle l. gray Jeffery A. Bertke Hong Yang Department of Chemical and Biomolecular Engineering University of Illinois at Urbana-Champaign MC-712 206 Roger Adams I Laboratory 600 S. Matthews Avenue Urbana Illinois 61801 USA George l. Clark X-ray Facility University of Illinois at Urbana-Champaign 505 S. Matthews Avenue Urbana Illinois 61801 USA

Unlike nucleation and growth in simple precipitation processes, described by the classical theory, metal nanoparticles formed in organic solvents with capping ligands often involve chemical reactions that occur homogeneously in solution or heterogeneously on the metal surface. These chemical reactions lead to the formation of intermediates that occurs in the process of deposition onto nuclei during the reduction. The understanding of these chemical reactions would enable a better design of functional metal nanocrystals, even those with unconventional hierarchical morphologies. In this study, we report the formation of dish-shaped nanostructures of palladium （Pd） obtained from palladium acetylacetonate （Pd（acac）2） in the presence of oleylamine and oleic acid. The process was correlated with the kinetic-controlled evolution of two-dimensional （2D） Pd nanosheets. The formation of Pd-ligand complexes was revealed using single-crystal X-ray diffraction, ultraviolet-visible spectroscopy, and mass spectrometry. These intermediates affected the formation kinetics of the 2D nanostructures and higher-ordered morphology of the nanodishes.

关键词： palladium nanoplates two-dimensional materials. complexation nucleation growth

Cost and value of office-based facial plastic and reconstructive surgery procedures

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World Journal of Otorhinolaryngology-Head and Neck Surgery 2023年第3期9卷 257-261页

作者： Alexandra O.Hamberis Mingyang l.gray Department of Otolaryngology-Head and Neck Surgery Icahn School of Medicineat Mount SinaiNew YorkUSA

Introduction:This chapter will provide an overview of factors affecting the cost of office-based procedures in Facial Plastics and Reconstructive Surgery(FPRS),and will discuss the value of office-based *** and Methods:An in-depth literature review was conducted using multiple primary and secondary *** from multiple disciplines was included in the review,including otolaryngology,anesthesiology,surgery,public health,and ***/Conclusions:A wide variety of procedures can be performed in an FPRS *** upfront costs to the office include laser,electrocautery and surgical *** investments will yield an initial negative cost margin until sufficient case volume is *** is often in the best interest of the patient to perform a procedure in-office and avoid the facility and anesthesia fees associated with a surgical center or *** and reimbursements vary greatly across regions and ***,overall cost depends on payer mix,procedures performed,and productivity of the *** scarcity of literature on this topic as it applies specifically to FPRS indicates that further research is needed to elucidate the value of common facial plastics procedures in an office-based setting.

关键词： facial plastic surgery office-based procedures reconstructive surgery

Comparing the Time-Deformation Method with the Fractional Fourier Transform in Filtering Non-Stationary Processes

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Journal of Signal and Information Processing 2012年第4期3卷 491-501页

作者： Mengyuan Xu Wayne A. Woodward Henry l. gray Department of Statistical Science Southern Methodist University Dallas USA Statistics Genomics Unit NIH/NIMH (National Institutes of Health/National Institute of Mental Health) Bethesda USA

The classical linear filter is able to extract components from multi-component stochastic processes where the frequencies of components do not overlap over time, but fail for those processes where the frequencies overlap over time. In this paper, we discuss two filtering methods for non-stationary processes: the G-filtering method and the Fractional Fourier transform (FrFT) method. The FrFT method is mainly designed for linear chirp signals where the frequency is linearly changing with time. The G-filter can be used to filter signals with wide range of frequency behaviors such as linear chirps, quadratic chirps and other type of chirp signals with strong time-varying frequency behavior. If frequencies of the components can be approximated or separated by a straight line or a polynomial curve, the G-filter can successfully extract components from the original series. We show that the G-filter is applicable to a wider variety of filtering applications than methods such as the FrFT which require data of a specified frequency behavior.

关键词： Filtering Time-Frequency Time-Deformation Fractional Fourier Transform

Pilot Study For Diagnosing Dementia in Older Adults Using Video Consultation

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Pilot Study For Diagnosing Dementia in Older Adults Using Vi...

Improvements to Female Autonomy and Household Decision-Making Power from an Intervention Targeting Improved Food Security: A Gender-Based Analysis of the Rajasthan Nutrition Project

The 8th Asia/Oceania Regional Congress of Gerontology and Geriatrics

作者： M Martin-Khan P Varghese R Wootton l gray Academic Unit in Geriatric Medicine University of Queensland Australia Geriatric and Rehabilitation Unit Queensland Health Australia Centre for Online Health University of Queensland Australia Academic Unit in Geriatric Medicine University of Queensland Australia

＜正＞Background:Telehealth memory clinics have been established in Australia for some *** is limited research available to support evidence based *** pilot aims to identify inter-rater reliability for the diagnosis o...

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Health 2021年第2期13卷 188-203页

作者： lindsay M. Belvedere Siena F. Davis Bobbi l. gray Benjamin T. Crookston Department of Public Health Brigham Young University Provo UT USA Grameen Foundation Washington USA

In India, women and children continue to experience food insecurity. The purpose of this study is to evaluate whether the Rajasthan Nutrition Project (RNP) led to changes in 1) dietary habits and nutrition, and 2) indicators of gender equality, female autonomy, and empowerment. This study surveyed women belonging to self-help groups who were pregnant or who had young children. Over the course of the intervention, significant improvements were seen in the following indicators: breastfeeding within one hour of birth, exclusively breastfeeding for the first six months, food insecurity of children and mothers, household decision-making, communication, mobility, and domestic violence. These findings suggest that the RNP is a promising intervention for improving nutrition and female autonomy in Rajasthan, India. Additional research is needed to determine if the RNP would be equally as effective in other regions of India, or in populations outside of India.

关键词： India Rajasthan Female Autonomy Food Security Maternal and Child Health

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澳大利亚的老年服务

全科医生 1999年第2期8卷 49-50页

作者： gray,l 丁传平江苏职工医科大学

Factors Associated with Accessing ICDS Services among Women in Rural Rajasthan, India

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