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Ultrafast synthesis and sintering of materials in a single running experiment approach by using electric fields

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Journal of Advanced Ceramics 2019年第2期8卷 265-277页

作者： Lílian M.JESUS Ronaldo S.SILVA Jean-claude M’PEKO Sao Carlos Institute of Physics University of Sao Paulo(USP)P.O.Box:369CEP:13560-970 Sao CarlosSPBrazil Group of Advanced Ceramic Materials Department of PhysicsFederal University of Sergipe(UFS)CEP:49100-000 Sao CristovaoSEBrazil Department of Physics Federal University of Sao Carlos(UFSCar)13560-905 Sao CarlosSPBrazil

Processing of materials in the form of ceramics normally involves several steps including calcination at a relatively low temperature for synthesis of the end-product powder and sintering at a high temperature for *** work we have been developing introduces a novel approach enabling synthesis plus sintering of materials in a single running experiment by using electric fields,ending with dense ceramics that display grains noticeably finer than in conventional *** new paradigm is fully illustrated with experiments conducted on amorphous CaCu3Ti4O12 precursor powder,shown to experience,on heating,crystallization through intermediate phases,followed by chemical reaction leading to synthesis of the end-product powder,plus densification depending on field *** processing time and furnace temperature are considerably reduced,demonstrating that enhanced synthesis and sintering rates applied under field *** results found in Bi2/3Cu3Ti4O12are also *** different factors that may contribute to this unique scenario,including Joule heating,defect generation,and reduction of free energy for nuclei formation promoted by the applied field,are briefly ***,the findings we bring here are exclusive as they show an exploitable way that allows rapid processing of materials with good control over particle and grain coarsening.

关键词： field-assisted processing synthesis sintering microstructure dielectric response

Simulating Human Visual Perception in Nighttime Illumination

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Tsinghua Science and Technology 2009年第1期14卷 133-138页

作者：周宁董未名王家廞 Paul Jean-claude Department of Computer Science and Technology Tsinghua University INRIA Lorraine

This paper presents an image-based algorithm for simulating the visual adaptation of the human visual system to various illuminations, especially in dark nighttime conditions. The human visual system exhibits different characteristics depending on the illumination intensity, with photopic vision in bright conditions, scotopic vision in dark conditions, and mesopic vision between these two. A computational model is designed to simulate multiple features of mesopic vision and scotopic vision, including the chromaticity change, luminance change, and visual acuity loss. The system uses a source image under bright illumination as input. Then assuming that the viewer has already adapted to the new conditions, the color spectrum of the input image is reconstructed to replace the source with modifications of the chromaticity and the luminance of the relighted scene. A bilateral filter is used to simulate the visual acuity loss. The model parameters have clear physical meanings and can be obtained from experimental data to achieve realistic *** algorithm can be used not only for visual perception simulation, but also as a day-for-night tool to produce realistic nighttime images from daytime images.

关键词： Image enhancement

The local contribution to the microwave background radiation

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Research in Astronomy and Astrophysics 2015年第4期15卷 461-474页

作者： Jean-claude Pecker Jayant V.Narlikar Francois Ochsenbein Chandra Wickramasinghe College de France Inter-University Centre for Astronomy and Astrophysics Centre de Donnees astronomiques de Strasbourg (CDS) Observatoire de Strasbourg11rue de l’Universite 67000 StrasbourgFrance Buckingham Centre for Astrobiology University of Buckingham

The observed microwave background radiation （MBR） is commonly in- terpreted as the relic of an early hot universe, and its observed features （spectrum and anisotropy） are explained in terms of properties of the early universe. Here we describe a complementary, even possibly alternative, interpretation of MBR, first proposed in the early 20th century, and adapt it to modern observations. For example, the stellar Hipparcos data show that the energy density of starlight from the Milky Way, if suit- ably thermalized, yields a temperature of ~2.81 K. This and other arguments given here strongly suggest that the origin of MBR may lie, at least in a very large part, in re-radiation of thermalized galactic starlight. The strengths and weaknesses of this alternative radical explanation are discussed.

关键词： Galaxy: stellar content -- (cosmology:) cosmic microwave background-- cosmology: observations

Seasonal changes in the parasite prevalence of a small Malagasy lemur species (Lepilemur edwardsi)

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Integrative Zoology 2023年第3期18卷 427-439页

作者： Janina BETHGE Jean claude RAZAFIMAMPIANDRA Arne WULFF Kathrin H.DAUSMANN Institute of Zoology Functional EcologyUniversität HamburgHamburgGermany Mention Zoologie et BiodiversitéAnimale Facultédes SciencesUniversitéd’AntananarivoAntananarivoMadagascar

Parasitic infections can impact theﬁtness of individuals and can have inﬂuence on animals’population *** individuals’parasite prevalence often changes depending on external or seasonal changes,for example,rainfall and ambient temperatures,but also on internal changes,for example,changes in body *** this study we aimed to identify the environmental factors that may inﬂuence the intestinal parasite and ectoparasite prevalence of the folivorous Malagasy primate species,Lepilemur edwardsi,living in a seasonal dry deciduous *** living in this habitat have to adapt to seasonal changes of ambient temperature,with almost no precipitation during the dry season and hence strongﬂuctuations of resource availability throughout the *** sampled the feces and ectoparasites of *** throughout the *** parasite prevalence increased from the wet to the dry season and was highest in the late dry season,which might be due to the accompanying decrease in diet ***,ectoparasite prevalence decreased in the dry season,presumably due to the prevailing unfavorable environmental conditions for the development of ectoparasites(i.e.,mites and ticks).Paired with the higher resting metabolism and stress level of *** during the late dry season,it seems that this species may struggle when dry seasons intensify in its habitat.

关键词： ectoparasites intestinal parasites Madagascar primates seasonality

Investigations on the Interactions between Li-TFSI and Glass Fibers in the Ternary PP/GF/Li-TFSI Composites

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Chinese Journal of Polymer Science 2018年第1期36卷 113-118页

作者： Sen-Lin Gu Huan-Huan Liu Huan Cao claude Mercier Yong-Jin Li College of Material Chemistry and Chemical EngineeringHangzhou Normal UniversityHangzhou 310036China Solvay Co.Ltd shanghai 201100China

The polypropylene/glass fiber（PP/GF） composites with excellent antistatic performance and improved mechanical properties have been reported by incorporation of a very small amount of the organic salt, lithium bis（trifluoromethanesulfonyl）imide（Li-TFSI）, into the PP/GF composites. It was considered that GF could play the role as the pathways for the movements of ions in the ternary composites. In this work, the interactions between Li-TFSI and glass fiber and the effects of such interactions on the physical properties of the composites have been systematically investigated. Three types of glass fibers with different ―OH group concentrations have been prepared in order to compare the interactions between GF and Li-TFSI. It was found that the ―OH group concentrations on the surface of glass fiber have significant effects on interactions between glass fibers and Li-TFSI. Such interactions are crucial for both the antistatic and mechanical performances of the final PP/GF/Li-TFSI composites. The investigation indicated that the GF with high ―OH group concentrations confined the movement of TFSI-, which decreased the antistatic properties of PP/GF/Li-TFSI composites. On the other hand, the GF with low ―OH group concentrations inhibited the absorption of Li-TFSI onto the GF, which also hindered the formation of Li-TFSI conductive pathway. The best antistatic performance of the ternary composites can be achieved at the intermediate ―OH concentrations on the GF.

关键词： Polypropylene Glass fiber Li-TFSI Antistatic performance

Not just a combination: a fully-integrated strategy of cellular therapy for acute myeloid leukemia expressing CD7, a heretofore elusive target

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Science China Life Sciences 2024年

作者： Norbert-claude Gorin Department of Hematology and Cell Therapy EBMT Global Committee and Paris Office H?pital Saint Antoine APHP Paris Sorbonne University

Acute myeloid leukemia(AML) and its treatment have remained, for long, an area of slow but constant therapeutic progress as well as of permanent frustration. Chemotherapy has initially been and still is part of the ba...

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Acousto-optically driven lensless single-shot ultrafast optical imaging

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Light(Science & Applications) 2022年第4期11卷 628-643页

作者： Mohamed Touil Said Idlahcen Rezki Becheker Denis Lebrun claude Roze Ammar Hideur Thomas Godin ORIA CNRS UMR6614-University de Rouen Normandie-INSA Rouen76800 Saint Etienne du RouvrayFrance

Driven by many applications in a wide span of scientifc fields,a myriad of advanced ultrafast imaging techniques have emerged in the last decade,featuring record-high imaging speeds above a trllion-frame-per-second with long sequence *** bringing remarkable insights into various ultrafast phenomena,their application out of a laboratory environment is however limited in most cases,either by the cost,complexity of the operation or by heavy data *** then report a versatile single-shot imaging technique combining sequentially timed lloptical mapping photography(STAMP)with acousto-optics programmable dispersive fhItering(AOPDF)and digital in-line holography(DIH).On the one hand,a high degree of simplicity is reached through the AOPDF,which enables full control over the acquisition parameters via an electrically driven phase and amplitude spectro-temporal tailoring of the imaging ***,contrary to most single-shot techniques,the frame rate,exposure time,and frame intensities can be independently adjusted in a wide range of pulse durations and chirp values without resorting to complex shaping stages,making the system remarkably agile and *** the other hand,the use of DIH,which does not require any reference beam,allows to achieve an even higher technical simplicity by allowing its lensless operation but also for reconstructing the object on a wide depth of field,contrary to classical techniques that only provide images in a single *** imaging speed of the system as well as its flexibility are demonstrated by visualizing ultrashort events on both the picosecond and nanosecond *** virtues and limitations as welll as the potential improvements of this on-demand ultrafast imaging method are critically discussed.

关键词： simplicity resort bringing

High-resolution and instantaneous imaging of latent fingerprints

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Chinese Chemical Letters 2023年第4期34卷 1-2页

作者： Ming Cheng Juli Jiang Jean-claude Chambron Leyong Wang Key Laboratory of Mesoscopic Chemistry of MOE Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Institut de Chimie de Strasbourg UMR 7177CNRSUniversitéde StrasbourgStrasbourg Cedex 67008France

Fingerprints can serve as an information storage platform for individuals and play an important role in forensic investigation and security[1].Most of them are invisible to the naked eye and are called latent fingerprints(LFPs).Conventional imaging techniques suffer from limitations like low resolution and sensitivity[2],restricting the recognition of LFPs to macroscopic features,such as shape,core,ending,bifurcation,island,pores,and so on,which correspond to levels 1 and *** of level 3 including ridges and their edges,are challenging to recognize.

关键词： latent resolution restrict

Cross-border Insolvency of Financial Institutions(Case of Banks in Rwanda)

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Cross-border Insolvency of Financial Institutions(Case of Ba...

作者： RUDACOGORA JEAN claude 华东政法大学

学位级别：硕士

面临财务困难的银行可能在不同的国家有运营、子公司和分支机构。由于经济衰退,银行可能面临财务压力,可能导致部分业务暂停,从而导致资不抵债和破产。重要的是要考虑外国银行的资不抵债是否会对其位于不同州、地区或司法管辖区的分支... 详细信息

面临财务困难的银行可能在不同的国家有运营、子公司和分支机构。由于经济衰退,银行可能面临财务压力,可能导致部分业务暂停,从而导致资不抵债和破产。重要的是要考虑外国银行的资不抵债是否会对其位于不同州、地区或司法管辖区的分支机构或子公司产生影响。目前,在国际一级,没有适用的文书或条例规定了银行跨国界破产问题的解决办法。《贸易法委员会跨境破产示范法》和《欧洲破产条例》都没有关于解决信贷机构跨境破产问题的任何条款。虽然欧盟已经通过了一些专门的规则来规范信贷机构,如《信贷机构重组与清盘指令》,但这并不能简单地适用于世界其他地区,因为它只适用于欧盟成员国。就卢旺达而言,目前没有关于金融机构破产的具体法律,因此可以认为,与信贷机构特别是银行跨国界破产有关的所有事项都由《2021年破产法》管理,而不考虑管理这些机构的特别规则。显然,贸易法委员会跨国界破产示范法启发了卢旺达跨国界破产领域的破产法。但是,卢旺达的破产法没有具体处理与银行有关的破产问题,也没有具体说明《贸易法委员会跨国界破产示范法》第2条规定的保留意见。卢旺达银行法律规定,外国银行或外国公司的子公司在卢旺达共和国必须保持账户分开父母的银行或母公司,但这项法律也对此事保持沉默对外国银行或其分支机构的破产。鉴于卢旺达银行业的发展,至关重要的是要建立一个具体制度来管制银行的跨国界破产。这项研究突出表明,需要建立具体的法律制度来解决卢旺达银行的跨国界破产问题。

关键词：银行跨境破产