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Sorption of Perfluorooctane sulfonate(PFOS) including its isomers on hydrargillite as a function of pH,humic substances and Na2SO4

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Journal of Environmental Sciences 2022年第1期34卷 263-272页

作者： Jean-Noel Uwayezu leo W.Y.Yeung Mattias Bäckström Man-Technology-Environment Research Centre(MTM) Örebro University70182ÖrebroSweden

Perfluorooctane sulfonate(PFOS)is a persistent organic pollutant(POP)and emergent contaminant that are widespread in the *** the mechanisms controlling the distribution of PFOS and its isomers between hydrargillite and the water phase is important in order to study their redistribution and mobility in the *** study investigated the effects of pH,humic acid,fulvic acid and Na_(2)SO_(4) on sorption of PFOS isomers to hydrargillite.A mixture of PFOS isomers was spiked into water and hydrargillite was added to the system and shaken for one day;the system was tested with different aqueous *** of PFOS isomers in the aqueous phase were quantified using an ultra-performance liquid chromatograph coupled to a triple quadrupole mass *** results showed that the distribution coefficients of PFOS isomers were found to be 0.76,0.71,0.93 and 0.90 at pH 6.5,for 3-/4-/5-PFOS,6-/2-PFOS,L-PFOS and total PFOS *** distribution coefficients increased at lower pH and decreased at alkaline *** presence of humic substances(HS)increased the sorption slightly at the environmental pH of 6.5,although a competition effect was observed during acidic conditions.A tendency of PFOS distribution to hydrargillite in the presence of Na_(2)SO_(4) was like its behavior in the presence of HS although the mechanisms behind the sorption were interpreted *** study revealed that L-PFOS was readily sorbed when no other chemicals were added or in 20 mg/L FA or 100 mg/L Na_(2)SO_(4).We suggest that an increase in PFOS sorption in the presence of HS may be due to hydrophobic mechanisms while Na_(2)SO_(4) contributed to increased sorption through ionic strength effects.

关键词： Hydrargillite Perfluorooctane sulfonate Sorption Humic substances Electrostatic,Ionic strength

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Intraepithelial lymphocytes: bystanders or causative factors in functional gastrointestinal disorders?

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Cellular & Molecular Immunology 2021年第7期18卷 1620-1621页

作者： Giuseppe Losurdo Domenico Piscitelli Enzo Ierardi Alfredo Di leo Section of Gastroenterology Department of Emergency and Organ TransplantationUniversity of BariBariItaly Ph.D.Course in Organs and Tissues Transplantation and Cellular Therapies Department of Emergency and Organ TransplantationUniversity of BariBariItaly Section of Pathology Department of Emergency and Organ TransplantationUniversity of BariBariItaly

Intraepithelial lymphocytes(IELs)are immune cells located in the epithelium of the mucosal layer of the gastrointestinal tract that typically show a CD3-positive *** are T lymphocytes that are involved in the primary immune response to several luminal antigens,such as food proteins and infectious *** this reason,their increase may be pathogenetic in several diseases,the most important being celiac ***,an increase above 25 IELs/100 enterocytes in the duodenum,which is considered the cutoff value for celiac disease,may occur in several conditions,such as nonceliac gluten sensitivity,food allergy,Helicobacter pylori(***)infection,gastroenteritis,and even irritable bowel syndrome(IBS).Therefore,the generic term“microscopic enteritis”or“duodenal lymphocytosis”has been proposed for this condition.

关键词： lymphocytes gastrointestinal epithelium

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Balancing Accuracy and Training Time in Federated Learning for Violence Detection in Surveillance Videos: A Study of Neural Network Architectures

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JOURNAL OF COMPUTER SCIENCE AND TECHNOLOGY 2024年第5期39卷 1029-1039页

作者： Pajon, Quentin Serre, Swan Wissocq, Hugo Rabaud, leo Haidar, Siba Yaacoub, Antoun Ecole Super Informat Elect Automat ESIEA F-75005 Paris France

This paper presents an original investigation into the domain of violence detection in videos, introducing an innovative approach tailored to the unique challenges of a federated learning environment. The study encompasses a comprehensive exploration of machine learning techniques, leveraging spatio-temporal features extracted from benchmark video datasets. In a notable departure from conventional methodologies, we introduce a novel architecture, the "Diff Gated" network, designed to streamline preprocessing and training while simultaneously enhancing accuracy. Our exploration of advanced machine learning techniques, such as super-convergence and transfer learning, expands the horizons of federated learning, offering a broader range of practical applications. Moreover, our research introduces a method for seamlessly adapting centralized datasets to the federated learning context, bridging the gap between traditional machine learning and federated learning approaches. The outcome of this study is a remarkable advancement in the field of violence detection, with our federated learning model consistently outperforming state-of-the-art models, underscoring the transformative potential of our contributions. This work represents a significant step forward in the application of machine learning techniques to critical societal challenges.

关键词： artificial intelligence federated learning neural network violence detection video analysis

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PRODUCTION OF ULTRAFINE PARTICLES OF OXIDES AND NITRIDES BY LASER BEAMS

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Transactions of Nonferrous Metals Society of China 1992年第1期2卷 58-60页

作者： Xu Huibin Tan Shusong leo Tungwa Ngal Technische Universitat Berlin FRG Central-South University of Technology Changsha 410083China University of Wisconsin U.S.A

Ultrafine particles of Al_(2)O_(3),MoO_(3),TiO_(2)and SiO_(2)were prepared by irradiate high power laser beams on material surface in O_(2)atmosphere as well as TiN in N_(2) atmosphere.X-ray diffractometer analysis identified that all oxides and nitrides powder obtained are crystalline except SiO_(2) particles which have amorphous struc-ture.

关键词： ultrafine powder oxide nitride laser

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Adjustable white-light emission from a photo-structured micro-OLED array

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Light(Science & Applications) 2016年第1期5卷 598-603页

作者： Simonas Krotkus Daniel Kasemann Simone Lenk Karl leo Sebastian Reineke Dresden Integrated Center for Applied Physics and Photonic Materials(IAPP)and Institute for Applied Physics Technische Universität Dresden01062 DresdenGermany

White organic light-emitting diodes(OLEDs)are promising candidates for future solid-state lighting applications and backplane illumination in large-area *** very specific feature of OLEDs,which is currently gaining momentum,is that they can enable tunable white light *** feature is conventionally realized either through the vertical stacking of independent OLEDs emitting different colors or in lateral arrangement of *** vertical design is optically difficult to optimize and often results in efficiency compromises between the *** contrast,the lateral concept introduces severe area losses to dark regions between the subunits,which requires a significantly larger overall device area to achieve equal *** we demonstrate a color-tunable,two-color OLED device realized by side-by-side alignment of yellow and blue p-i-n OLEDs structured down to 20μm by a simple and up-scalable orthogonal photolithography *** layout eliminates the problems of conventional lateral approaches by utilizing all area for light *** corresponding emission of the photo-patterned two-unit OLED can be tuned over a wide range from yellow to white to blue *** independent control of the different units allows the desired overall spectrum to be set at any given brightness *** as a white light source,the microstructured OLED reaches a luminous efficacy of 13 lm W^(−1) at 1000 cd m^(−2) without an additional light outcoupling enhancement and reaches a color rendering index of 68 when operated near the color point ***,we demonstrate an improved device lifetime by means of size variation of the subunits.

关键词： color tuning hydrofluoroethers orthogonal photolithography orthogonal processing white organic light-emitting diodes

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DIFFUSION COUPLE BETWEEN HIGHSTRENGTH WEAR-RESISTING ALUMINUM BRONZE AND MACHINING TOOLS MATERIALS

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中国有色金属学会会刊：英文版 1999年第1期9卷 8-10,10+12+9+11页

作者： Li, Yuanyuan Zhang, Datung Ngai Tungwai, leo Xia, Wei Long, Yan South China Univ of Technology Guangzhou China

ＩＮＴＲＯＤＵＣＴＩＯＮＡｌｕｍｉｎｕｍｂｒｏｎｚｅｉｓａｎｉｍｐｏｒｔａｎｔｅｎｇｉｎｅｅｒｉｎｇｍａｔｅｒｉａｌ．Ｉｔｓｅｘｃｅｌｅｎｔｐｈｙｓｉｃａｌ，ｍｅｃｈａｎｉｃａｌ，ａｎｔｉｃｏｒｏｓｉｏｎａｎｄｗ... 详细信息

ＩＮＴＲＯＤＵＣＴＩＯＮＡｌｕｍｉｎｕｍｂｒｏｎｚｅｉｓａｎｉｍｐｏｒｔａｎｔｅｎｇｉｎｅｅｒｉｎｇｍａｔｅｒｉａｌ．Ｉｔｓｅｘｃｅｌｅｎｔｐｈｙｓｉｃａｌ，ｍｅｃｈａｎｉｃａｌ，ａｎｔｉｃｏｒｏｓｉｏｎａｎｄｗｅａｒｒｅｓｉｓｔｉｎｇｐｒｏｐ...

关键词： wear resistance aluminum bronze tool materials diffusion

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Regulation of the SQUAMOSA PROMOTER-BINDING PROTEIN-LIKE genes/microRNA 156 Module by the Homeodomain Proteins PENNYWISE and POUND-FOOLISH in Arabidopsis

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Molecular Plant 2011年第6期4卷 1123-1132页

作者： Shruti Lal leo Bryan Pacis Harley M.S. Smith Genetics Genomics and Bioinformatics Graduate Program University of California Riverside CA 92521 USA Center for Plant Cell Biology Institute of Integrative Genome Biology Department of Botany and Plant Sciences University of California Riverside CA 92521 USA

The morphology of inflorescences is regulated in part by the temporal and spatial events that regulate flower specification. In Arabidopsis, an endogenous flowering time pathway mediated by a subset of SQUAMOSA PROMOTER- BINDING PROTEIN-LIKE （SPL） transcription factors, including SPL3, SPL4, and SPL5, function to specify flowers by activating floral meristem identity genes. During shoot development, SPL3, SPL4, and SPL5 are post-transcriptionally regulated by microRNA156 （miR156）. The photoperiod regulated florigenic signal, FLOWERING LOCUS T （FT）, promotes floral induction, in part by activating SPL3, SPL4, and SPL5. In turn, these SPLs function in parallel with FT to specify flower meristems. Two related BELLl-like homeobox genes PENNYWISE （PNY） and POUND-FOOLISH （PNF） expressed in the shoot apical meristem are absolutely required for the specification of floral meristems. Genetic studies show that the floral specification function of FT depends upon PNYand PNF; however, the interplay between these homeodomain proteins and SPLs is not known. In this manuscript, we show that the photoperiodic floral induction of SPL3, SPL4, and SPL5 is dependent upon PNY and PNE Further, PNY and PNF also control SPL3, SPL4, and SPL5 expression by negatively regulating miR156. Lastly, ectopic expres- sion of SPL4 partially rescues the pny pnf non-flower-producing phenotype, while overexpression of SPL3 or SPL5 in pny pnf plants was unable to restore flower specification. These results suggest that：（1） SPL3, SPL4, and SPL5 function is dependent upon PNY and PNF, or （2） expression of multiple SPLs is required for floral specification in pny pnf plants.

关键词： Development meristem homeodomain flowering microRNA.

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Visual ＂playback＂ of colorful signals in the field supports sensory drive for signal detectability

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Current Zoology 2018年第4期64卷 493-498页

作者： Alex R. GUNDERSON leo J. FLEISHMAN Manuel LEAL Department of Integrative Biology University of California Berkeley CA 94720 USA Department of Biology Union College Schenectady NY 12308 USA Division of Biological Sciences University of Missouri 105 Tucker Hall Columbia MO 65211 USA

Colorful visual signals are important systems for investigating the effects of signaling environ ments and receiver physiology on signal evolution as predicted by the sensory drive hypothesis. Support for the sensory drive hypothesis on color signal evolution is mostly based on document ing correlations between the properties of signals and habitat conditions under which the signals are given （i.e., a correlational approach） and less commonly on the use of mathematical models that integrate representations of visual environments, signal properties, and sensory systems （i.e., a functional approach）. Here, we used an experimental approach in the field to evaluate signal efficacy of colorful lizard throat fans called dewlaps that show geographic variation in the lizard Anolis cristatellus. We used a remote controlled apparatus to display ＂fake dewlaps＂ to wild lizards to test for adaptive divergence in dewlap brightness （i.e., perceived intensity） among populations in situ. We found evidence of local adaptation in dewlap brightness consistent with the sensory drive hypothesis. Specifically, dewlaps that had the brightness characteristics of local lizards were more likely to be detected than those with the brightness characteristics of nonlocal lizards. Our findings indicate that simplified mathematical representations of visual environments may allow robust estimates of relative detectability or conspicuousness in natural habitats. We have shown the feasibility of evaluating color signal efficacy experimentally under natural conditions and dem onstrate the potential advantages of presenting isolated components of signals to an intended re ceiver to measure their contribution to signal function.

关键词： Anolis color signal sensory drive signal evolution

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Galactic center research:manifestations of the central black hole

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Research in Astronomy and Astrophysics 2012年第8期12卷 995-1020页

作者： Mark R.Morris leo Meyer Andrea M.Ghez Department of Physics and Astronomy University of CaliforniaLos Angeles 90095-1547USA

This review summarizes a few of the frontiers of Galactic center research that are currently the focus of considerable activity and attention. It is aimed at pro- viding a necessarily incomplete sketch of some of the timely work being done on phenomena taking place in, or originating in, the central few parsecs of the Galaxy, with particular attention to topics related to the Galactic black hole （GBH）. We have chosen to expand on the following exciting topics： 1） the characterization and the im- plications for the variability of emission from the GBH, 2） the strong evidence for a powerful X-ray flare in the Galactic center within the past few hundred years, and the likelihood that the GBH is implicated in that event, 3） the prospects for detecting the ＂shadow＂ of the GBH, 4） an overview of the current state of research on the central S-star cluster, and what has been learned from the stellar orbits within that cluster, and 5） the current hypotheses for the origin of the G2 dust cloud that is projected to make a close passage by the GBH in 2013.

关键词： Galaxy: center -- black hole physics -- X-rays -- infrared radiation --ISM: clouds

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A Brief History of Early Sino—American Relations 1784—1844

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解放军外国语学院学报 1993年第4期16卷 94-103页

作者： leo J.Mahoney WestarkCommunity College

On February 23,1993,the General Secretary of the Chinese Communist Party,JiangZemin,granted an interview in Beijing to *** ＆World Report’s editor,*** to a relation of their conversation in the March 10,1993,issueof China Daily,Secretary Jiang made a number of important statements about China’scurrent policy towards the United *** remarks were obviously based on

关键词：上工工厂山地油灯山口孤儿扣动沙化班规上注

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