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Effect of polymer and fiber additives on pressure drop in a rectangular channel

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Journal of Hydrodynamics 2017年第5期29卷 871-878页

作者： Amir Eshghinejadfard Kashyapa Sharma dominique Thévenin Laboratory of Fluid Dynamics and Technical Flows University of Magdeburg"Otto von Guericke"Universitatsplatz 239106 MagdeburgGermany

The influence of minute amounts of additives on pressure drop is an interesting fundamental phenomenon, potentially with important practical applications. Change of the pressure drop in a quasi-two-dimensional channel flow using various additives is experimentally investigated. Tests were conducted for a wide range of concentrations（100 ppm-500 ppm） and Reynolds numbers（16 000-36 000） with two polymers and four rigid fibers used as additive. Maximum drag reduction of 22% was observed for xanthan gum. However, xanthan gum loses its drag-reducing property rapidly. It was also seen that drag reduction percentage of xanthan gum remains almost constant for different Reynolds numbers. Guar flour demonstrated good drag reduction property at high Reynolds numbers. Drag reduction of 17.5% at Re= 33 200 using 300 ppm solution was observed. However, at low Reynolds numbers guar flour will cause an increase in pressure drop. Fiber fillers（aspect ratio=21） have been tested as well. In contrast to polymers, they increased the drag for the range of examined concentrations and Reynolds numbers. Polyacrylonitrile fiber with three different aspect ratios（106, 200, 400） was also used, which showed an increase in pressure drop at low aspect ratios. Polyacrylonitrile fibers of larger lengths（6 mm） demonstrated minor drag-reducing effects（up to 3%）.

关键词： Pressure drop polymer fiber channel flow

Microwave Synthesis of Large Few-Layer Graphene Sheets in Aqueous Solution of Ammonia

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Nano Research 2010年第2期3卷 126-137页

作者： Izabela Janowska Kambiz Chizari Ovidiu Ersen Spyridon Zafeiratos Driss Soubane Victor Da Costa Virginie Speisser Christine boeglin Matthieu Houllé dominique bégin dominique Plee Marc-Jacques Ledoux Cuong Pham-Huu Laboratoire des Matériaux Surfaces et Procédés pour la Catalyse(LMSPC)UMR7515 CNRS-Universitéde Strasbourg 25rue Becquerel67087 Strasbourg Cedex 08France Institut de Physique et Chimie des Matériaux de Strasbourg(IPCMS) UMR7504 CNRS-Universitéde Strasbourg 23rue du Loess67037 Strasbourg Cedex 02France Arkema Groupement de Recherche de Lacq(GRL)BP 3464170 LACQFrance

Few-layer graphene (FLG) sheets with sizes exceeding several micrometers have been synthesized by exfoliation of expanded graphite in aqueous solution of ammonia under microwave irradiation, with an overall yield approaching 8 wt.%. Transmission electron microscopy (in bright-field and dark-field modes) together with electron diffraction patterns and atomic force microscopy confirmed that this graphene material consisted mostly of mono-, bi- or few-layer graphene (less than ten layers). The high degree of surface reduction was confirmed by X-ray photoelectron and infrared spectroscopies. In addition, the high stability of the FLG in the liquid medium facilitates the deposition of the graphene material onto several substrates via low-cost solution-phase processing techniques, opening the way to subsequent applications of the material.

关键词： Graphene transmission electron microscopy(TEM) expanded graphite exfoliation microwaves

Variceal bleeding in cirrhotic patients

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Gastroenterology Report 2017年第3期5卷 185-192,I0001页

作者： Maxime Mallet Marika Rudler dominique Thabut Unitede Soins Intensifs d’Hepatologie Service d’Hepato-GastroenterologieGroupe Hospitalier Pitie-Salpetriere Charles FoixAssistance Publique-Hopitaux de ParisParisFrance

Variceal bleeding is one of the major causes of death in cirrhotic *** management during the acute phase and the secondary prophylaxis is well *** recommendations(2015 baveno VI expert consensus)are available and should be followed for an optimal management,which must be performed as an emergency in a liver or general intensive-care *** is based on the early administration of a vasoactive drug(before endoscopy),an antibiotic prophylaxis and a restrictive transfusion strategy(hemoglobin target of 7 g/dL).The endoscopic treatment is based on band *** should be *** the most severe patients(Child Pugh C or b with active bleeding during initial endoscopy),transjugular intrahepatic portosystemic shunt(TIPS)should be performed within 72 hours after admission to minimize the risk of *** prophylaxis is based on the association of non-selective beta-blockers(NSbbs)and repeated band *** should be considered when bleeding reoccurs in spite of a well-conducted secondary prophylaxis or when NSbbs are poorly *** should also be considered when bleeding is *** transplantation should be discussed when bleeding is not controlled after TIPS insertion and in all cases when liver function is deteriorated.

关键词： variceal bleeding cirrhosis endoscopic treatment non-selective beta-blockers transjugular intrahepatic portosystemic shunt liver transplantation

Lipid infusion and intravenous access in newborn infants

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Chinese Medical Journal 2010年第20期123卷 2766-2768页

作者： dominique Haumont Neonatal Intensive Care Unit Saint-Pierre University Hospital Rue Haute 322 B 1000 Brussels Belgium

The spectacular development of neonatal intensive care since the 1960s allowed a drop in neonatal mortality of very-low-birth-weight （VLbW） infants from 50% to less than 15% in the last decade.

关键词： lipid infusion intravenous access newborn infant

N-terminal truncated RHT-1 proteins generated by translational reinitiation cause semi-dwarfing of wheat Green Revolution alleles

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Molecular Plant 2021年第4期14卷 679-687页

作者： Karel Van De Velde Stephen GThomas Floor Heyse Rim Kaspar dominique Van Der Straeten Antje Rohde bASF belgium Coordination Center-Innovation Center Gent Technologiepark 101.9052 GhentBelgium Rothamsted Research HarpendenHertfordshire AL52JQUK Laboratory of Functional Plant biology Department of BiologyGhent UniversitK.L.Ledeganckstrat 359000 GhentBelgium

The unprecedented wheat yield increases during the Green Revolution were achieved through the introduc-tion of the Reduced height(Rht)-b1b and Rht-D1b semi-dwarfing *** Rht-1 alleles encode growth-repressing DELLA genes containing a stop codon within their open reading frame that confers gibberellin(GA)-insensitive *** this study,we successfully took the hurdle of detecting wild-type RHT-1 proteins in different wheat organs and confirmed their degradation in response to *** further demonstrated that Rht-b1b and Rht-D1b produce N-terminal truncated proteins through trans-lational *** of these N-terminal truncated proteins in transgenic lines and in Rht-D1c,an allele containing multiple Rht-D1b copies,demonstrated their ability to cause strong dwarfism,resulting from their insensitivity to GA-mediated degradation.N-terminal truncated proteins were detected in spikes and nodes,but not in the aleurone *** Rht-b 1b and Rht-D1b alleles cause dwarfism but have wild-type dormancy,this finding suggests that tissue-specific differences in translational reinitiation may explain why the Rht-1 alleles reduce plant height without affecting *** together,our findings not only reveal the molecular mechanism underlying the Green Revolution but also demonstrate that trans-lational reinitiation in the main open reading frame occurs in plants.

关键词： gibberellin(GA)signaling DELLA Rht-1 dwarfing ales Green Revolution wheat translational reinitiation

道路基础设施工程PPP模式评价 ——以中国南方地区道路为例

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道路基础设施工程PPP模式评价 ——以中国南方地区道路为例

作者： Dingamlar dominique L.b.N. 北京交通大学

学位级别：硕士

道路、桥梁、铁路、学校和医院等公共基础设施对社会发展非常重要。但是,公共基础设施的建设需要大量资金,道路基础设施的投资尤其巨大,政府正在努力负担这样庞大的建设投资。为了解决这个问题,政府和私人实体选择了公私合作伙伴关系(P... 详细信息

道路、桥梁、铁路、学校和医院等公共基础设施对社会发展非常重要。但是,公共基础设施的建设需要大量资金,道路基础设施的投资尤其巨大,政府正在努力负担这样庞大的建设投资。为了解决这个问题,政府和私人实体选择了公私合作伙伴关系(PPP)模式,该模式非常适合应用于公共基础设施工程的投融资。本文强调了在建立PPP框架时应考虑的各经济参数,探讨了公共基础设施PPP投融资模式的各种影响因素,以及如何通过PPP框架,在道路工程规划建设时做出好的决策。因为道路基础设施需要大量的金融投资,因而在投资决策之前对项目做出一个准确的经济评估是至关重要的。因此,对道路基础设施的投资评估需要进行多参数分析。本文对采用PPP投融资模式的某条中国南方道路的投资安全性进行了评估。本文基于道路工程项目实例,以内部收益率(IRR)、净现值(NPV)、盈利能力指数(PI)、投资回收期等作为经济指标,着重对该项目采用PPP模式的可行性进行了经济评估。通过研究发现当内部收益率(IRR)等于10.21%时,项目的投资回报率最大。净现值(NPV)计算结果为18105.3万元人民币,高于私人部门要求的5000万元。这表明,投资该项目预期会获得很好的收益。盈利能力指数的计算结果为1.27,满足私人部门的经济投资评估指标,因此该中国南方道路工程项目的投资风险较低。该项目的投资回收期为21年,少于私人部门的24年的投资标准,按照该标准,该项目的投资安全性高。根据评估结果和指标,本文建议该道路工程项目采用PPP投融资模式。

关键词： PPP模式基础设施工程基础设施投融资项目管理

Effect of physiological harvest stages on the composition of bioactive compounds in Cavendish bananas

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Journal of Zhejiang University-Science b(biomedicine & biotechnology) 2013年第4期14卷 270-278页

作者： Christelle bRUNO bONNET Olivier HUbERT Didier MbEGUIE-A-MbEGUIE dominique PALLET Abel HIOL Max REYNES Patrick POUCHERET Université des Antilles et de la Guyane INRA URZ 143BP 25097157 Pointe-à-PitreGuadeloupeFrance Centre de Coopération International en Recherche Agronomique pour le Développement(CIRAD) UMR 95 QualisudStation de NeufchateauSainte-Marie97130 Capesterre-Belle-EauGuadeloupeFrance CIRAD UMR 95 QualisudTA B 95/1673 Rue Jean-Fran ois Breton34398 Montpellier Cedex 5France Laboratoire de Pharmacologie et Physiopathologie Expérimentale UMR 95 QualisudFaculté de PharmacieUniversité Montpellier 115 Avenue Charles Flahault34093 Montpellier Cedex 5France

The combined influence of maturation,ripening,and climate on the profile of bioactive compounds was studied in banana(Musa acuminata,AAA,Cavendish,*** Naine).Their bioactive compounds were determined by the Folin-Ciocalteu assay and high-performance thin layer chromatographic(HPTLC) *** polyphenol content of bananas harvested after 400 degree days remained unchanged during ripening,while bananas harvested after 600 and 900 degree days exhibited a significant polyphenol *** dopamine was the polyphenol with the highest concentration in banana peels during the green developmental stage and ripening,its kinetics differed from the total polyphenol *** results showed that this matrix of choice(maturation,ripening,and climate) may allow selection of the banana(***,AAA,Cavendish,*** Naine) status that will produce optimal concentrations of identified compounds with human health relevance.

关键词： banana Ripening Harvest ages Polyphenol Dopamine Starch

中法两家医院早发型新生儿脓毒症临床资料对比分析

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中华儿科杂志 2012年第9期50卷 664-671页

作者：范颖余加林 dominique ASTRUC 重庆医科大学附属儿童医院新生儿科 400014 67098 Strasbourg Cedex Department ofNeonatology Hautepierre Hospital of Strasbourg University Strasbourg France

目的了解中法两国对早发型新生儿脓毒症（early—onsetneonatalsepsis，EONS）在临床表现、诊断、治疗方面的不同，为提高重庆医科大学附属儿童医院（简称重医）对EONS的诊治水平提供依据。方法对法国某医院和重医共146例EONS患儿的细... 详细信息

目的了解中法两国对早发型新生儿脓毒症（early—onsetneonatalsepsis，EONS）在临床表现、诊断、治疗方面的不同，为提高重庆医科大学附属儿童医院（简称重医）对EONS的诊治水平提供依据。方法对法国某医院和重医共146例EONS患儿的细菌谱、临床表现、抗菌药使用、产前危险因素记录和筛查情况进行回顾性分析。结果重医常见致病菌为凝固酶阴性葡萄球菌（69．2％）和大肠杆菌（15．4％）；法国医院为b族链球菌（33．3％）和大肠杆菌（33．3％）。法国医院胃液和周围拭子培养常见大肠杆菌（33．3％），b族链球菌（21．2％），凝固酶阴性葡萄球菌（18．2％）等。重医抗菌药使用总天数11．4±7．2（d）、平均每个患儿抗菌药使用的种类（3．1±0．9）和换抗菌药人数比例（70．2％）均大于法国医院6．2±2．5（d），2．2±0．8（d），（9．9％）。两院首剂抗菌药常联用两种抗菌药（重医二代头孢＋半合成青霉素，法国医院阿莫西林＋阿米卡星）。重医二、三线抗菌药常见碳青霉烯类和万古霉素，法国医院常见三代头孢和万古霉素。重医对多种产前危险因素（绒毛膜羊膜炎、母亲发热、破膜到胎儿娩出时间、孕期是否行阴道拭子或尿路感染情况、羊水污染、产前抗菌药使用、EONS的既往史）的记录率均低于法国医院；产前危险因素筛查阳性率两院差异不大。在生后立即出现异常而入院的患儿中，两院最常见的异常均为呼吸困难（96．5％VS．88．2％）；在生后72h之内出现异常的患儿中，两院常见入院原因构成比不同：重医常见原因为呼吸困难（44．4％），反应差（22．2％）等；法国医院常见原因为C反应蛋白升高（78．2％），发热（5．5％）等。两所医院CRP诊断EONS的假阴性率无统计学差异。结论两所医院对EONS诊断、治疗有很大不同。重视产前危险因素的筛查与记录、加强产科对初生新生儿的监护可提高重医对EONS患儿的早期诊断的准确性。对具有产前／产时危险因素的新生儿积极进行胃液／周围拭子培养并行相应的药敏试验可能帮助临床医生进行抗菌药的选用．减少患儿的换药次数和抗菌药使用时间。

关键词：婴儿新生感染脓毒症抗菌药

Palaeozoic tectonic evolution of the Tianshan belt,NW China

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Science China Earth Sciences 2011年第2期54卷 166-184页

作者： Jacques CHARVET SHU LiangShu Sebastien LAURENT-CHARVET WANG bo Michel FAURE dominique CLUZEL CHEN Yan Koen De JONG ISTO Universite d'Orleans B.P. 6759 45067 Orleans Cedex 2 France State Key Laboratory for Mineral Deposits Research School of Earth Sciences and Engineering Nanjing University Nanjing 210093 China Institut Polytechnique LaSalle beauvais Departement Geosciences BP 30313 60026 Beauvais Cedex France PPME Universite de la Nouvelle Caledonie Noumea New Caledonia School of Earth and Environmental Sciences College of Natural Sciences Seoul National University Seoul 151-747 Korea

The Chinese Tianshan belt is a major part of the southern Central Asian Orogenic belt, extending westward to Kyrgyzstan and Kazakhstan. Its Paleozoic tectonic evolution, crucial for understanding the amalgamation of Central Asia, comprises two stages of subduction-collision. The first collisional stage built the Eo-Tianshan Mountains, before a Visean unconformity, in which all structures are verging north. It implied a southward subduction of the Central Tianshan Ocean beneath the Tarim active margin, that induced the Ordovician-Early Devonian Central Tianshan arc, to the south of which the South Tianshan back-arc basin opened. During the Late Devonian, the closure of this ocean led to a collision between Central Tianshan arc and the Kazakhstan-Yili-North Tianshan block, and subsequently closure of the South Tianhan back-arc basin, producing two suture zones, namely the Central Tianshan and South Tianshan suture zones where ophiolitic melanges and HP metamorphic rocks were emplaced northward. The second stage included the Late Devonian-Carboniferous southward subduction of North Tianshan Ocean beneath the Eo-Tianshan active margin, underlined by the Yili-North Tianshan arc, leading to the collision between the Kazakhstan-Yili-NTS plate and an inferred Junggar block at Late Carboniferous-Early Permian time. The North Tianshan Suture Zone underlines likely the last oceanic closure of Central Asia Orogenic belt; all the oceanic domains were consumed before the Middle Permian. The amalgamated units were affected by a Permian major wrenching, dextral in the Tianshan. The correlation with the Kazakh and Kyrgyz Tianshan is clarified. The Kyrgyz South Tianshan is equivalent to the whole part of Chinese Tianshan （CTS and STS） located to the south of Narat Fault and Main Tianshan Shear Zone; the so-called Middle Tianshan thins out toward the east. The South Tianshan Suture of Kyrgyzstan correlates with the Central Tianshan Suture of Chinese Tianshan. The evolution of this sou

关键词： Tianshan NW China tectonics Paleozoic accretion