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X射线荧光光谱法和X射线衍射技术在钢铁工业中的最新进展:化学分析与相分析的结合

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冶金分析 2009年第12期29卷 1-6页

作者： didier Bonvin Ravi Yellepeddi Thermo Electron S.A.

为满足钢铁工业分析的需要,X射线分析技术取得了创新发展。钢铁冶炼过程不但要求全元素/氧化物的分析,还要求在不同阶段进行相分析。X射线荧光光谱法(XRF)已作为常规方法应用于钢铁工业中的化学分析,而X射线衍射(XRD)的应用则受到限制... 详细信息

为满足钢铁工业分析的需要,X射线分析技术取得了创新发展。钢铁冶炼过程不但要求全元素/氧化物的分析,还要求在不同阶段进行相分析。X射线荧光光谱法(XRF)已作为常规方法应用于钢铁工业中的化学分析,而X射线衍射(XRD)的应用则受到限制。通过与钢铁生产者进行紧密合作,将XRD完全与XRF相结合,为进行完全的过程控制和质量控制的相关实验室提供全面的分析能力,这种在科技上取得的突破性进展满足了行业需要。事实上,从铁矿石到烧结矿、炉渣、铸铁和各种合金,XRF-XRD综合系统能够提供完整的化学及相分析,以优化并提高高炉/炼钢炉生产过程的效率。该种方法也适合生产直接还原铁的厂商使用,可对混有金属铁的不同状态的氧化铁及其它混合物/相进行常规定量分析。波长色散X射线荧光(WDXRF)领域已经取得重大进展,钢铁工业能够完全自主地完成特定的分析任务。例如,分析炉渣、铸铁、铁合金以及电镀或电解后的镀层厚度,就只需利用低成本的WDXRF系统来解决。根据分析量以及不同元素的测定要求,设计了从低功耗到高功耗的一系列XRF系统来进行定量分析,所有的"已知"材料都可采用专用的校准程序进行分析。本文还将介绍各种不同的XRF和XRD方案,重点是其应用和分析方法;XRF和XRD二者作为钢铁工业中有价值的分析工具,本文将讨论其不同的应用实例。

关键词： X射线荧光光谱法 X射线衍射整合分析烧结相游离氧化钙铸铁渣

In vitro and in vivo proves of concept for the use of a chemically cross-linked poly(ester-urethaneurea)scaffold as an easy handling elastomeric biomaterial for bone regeneration

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Regenerative Biomaterials 2019年第6期6卷 311-323页

作者： Geraldine Rohman Sylvie Changotade Sophie Frasca Salah Ramtani Anne Consalus Credson Langueh Jean-Marc Collombet didier Lutomski Universite Paris 13 Sorbonne Paris CiteTissue Engineering and Proteomics(TIP)TeamCSPBATUMR CNRS 724474 rue Marcel Cachin93000 BobignyFrance Departement Soutien Medico-Chirurgical des Forces(SMCF) BP73Institut de Recherche Biomedicale des Armees(IRBA)91223 Bretigny-sur-Orge CedexFrance UniversiteParis 13 Sorbonne Paris CiteLBPS TeamCSPBATUMR CNRS 724499 Avenue Jean-Baptiste Clement93430 VilletaneuseFrance

Bone loss can occur as a result of various pathologies,traumas and injuries and poor bone healing leads to functionally debilitating condition,loss of self-sufficiency and deterioration in life *** the increasing incidence of facial trauma and the emergence of new procedural techniques,advanced scaffolds are currently developed as substitutes for bone tissue *** this study,we investigated the capability of a chemically cross-linked e-caprolactone-based poly(esterurethane-urea)(PCLU)scaffold to support bone *** vitro assays demonstrated that PCLU scaffolds could be colonized by cells through direct cell seeding and cell migration from outside to scaffold ***,PCLU scaffolds could provide a suitable environment for stem cells proliferation in a 3D spatial arrangement,and allowed osteogenic differentiation under appropriate *** vivo results revealed the osteogenic properties of PCLU scaffolds through a drilled-hole femoral bone defect repair improvement in *** histology and microtomography analysis,we showed that PCLU scaffolds fit well the bone cavity and were eventually entrapped between the newly formed ***,no sign of inflammation or rejection was *** envision that PCLU scaffolds can provide the clinicians with a substitute having appropriate characteristics for the treatment of bone defects.

关键词： bone regeneration scaffold elastomer PEUU PCLU

Nanoparticles with high payloads of pipemidic acid, a poorly soluble crystalline drug: drug-initiated polymerization and self-assembly approach

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Acta Pharmaceutica Sinica B 2018年第3期8卷 420-431页

作者： Elisabetta Pancani Mario Menendez-Miranda Alexandra Pastor Francois Brisset Marie-Francoise Bernet-Camard didier Desmaele Ruxandra Gref Institut de Sciences Moléculaires d'Orsay(ISMO) Univ.of Paris-SudUniversitéParis-Saclay Institut Galien UMR8612 Univ.of Paris-SudUniversitéParis-Saclay Institut de Chimie Moléculaire et des Matériaux d'Orsay(ICMMO) Univ.of Paris-SudUniversitéParis-Saclay EA4043" UnitéBactéries Pathogènes et Santé"(UBaPS) Univ.of Paris-SudUniversitéParis-Saclay

Nowadays, biodegradable polymers such as poly(lactic acid)(PLA), poly(D,L-lactic-coglycolic acid)(PLGA) and poly(ε-caprolactone)(PCL) remain the most common biomaterials to produce drug-loaded nanoparticles(NPs). Pipemidic acid(PIP) is a poorly soluble antibiotic with a strong tendency to crystallize. PIP incorporation in PLA/PLGA NPs was challenging because of PIP crystals formation and burst release. As PIP had a poor affinity for the NPs, an alternative approach to encapsulation was used, consisting in coupling PIP to PCL. Thus, a PCL–PIP conjugate was successfully synthesized by an original drug-initiated polymerization in a single step without the need of ***–PIP was characterized by NMR, IR, SEC and mass spectrometry. PCL–PIP was used to prepare selfassembled NPs with PIP contents as high as 27%(w/w). The NPs were characterized by microscopy,DLS, NTA and TRPS. This study paves the way towards the production of NPs with high antibiotic payloads by drug-initiated polymerization. Further studies will deal with the synthesis of novel polymer–PIP conjugates with ester bonds between the drug and PCL. PIP can be considered as a model drug and the strategy developed here could be extended to other challenging antibiotics or anticancer drugs and employed to efficiently incorporate them in NPs.

关键词： Pipemidic acid Nanoparticle Antibiotic Nanoprecipitation Crystalline drug Drug-initiated polymerization

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Sintering study of Ti6Al4V powders with different particle sizes and their mechanical properties

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International Journal of Minerals,Metallurgy and Materials 2018年第12期25卷 1389-1401页

作者： JoséLuis Cabezas-Villa JoséLemus-Ruiz didier Bouvard Omar Jiménez Héctor Javier Vergara-Hernández Luis Olmos University Michoacana of San Nicolás of Hidalgo IIMMMorelia 58060México University Grenoble Alpes CNRSSIMaPGrenoble 38000France University of Guadalajara Departamento de Ingeniería de ProyectosZapopan 45100México National Technological Institute of Mexico I.T.MoreliaMorelia 58120México University Michoacana of San Nicolás of Hidalgo INICITMorelia 58060México

Ti6Al4V powders with three different particle size distributions(0–20, 20–45, and 45–75 μm) were used to evaluate the effect of the particle size distribution on the solid-state sintering and their mechanical properties. The sintering kinetics was determined by dilatometry at temperatures from 900 to 1260°C. The mechanical properties of the sintered samples were evaluated by microhardness and compression tests. The sintering kinetics indicated that the predominant mechanism depends on the relative density irrespective of the particle size used. The mechanical properties of the sintered samples are adversely affected by increasing pore volume fraction. The elastic Young's modulus and yield stress follow a power law function of the relative density. The fracture behavior after compression is linked to the neck size developed during sintering, exhibiting two different mechanisms of failure: interparticle neck breaking and intergranular cracking in samples with relative densities below and above of 90%, respectively. The main conclusion is that relative density is responsible for the kinetics, mechanical properties, and failure behavior of Ti6 Al4 V powders.

关键词： Ti6Al4V powders dilatometry microhardness sintering kinetics compression failure behavior

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Microfabricated polymer-metal biosensors for multifarious data collection from electrogenic cellular models

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Microsystems & Nanoengineering 2023年第2期9卷 167-180页

作者： Charles M.didier Julia F.Orrico Omar S.Cepeda Trres Jorge Manrique Castro Aliyah Baksh Swaminathan Rajaraman NanoScience Technology Center University of Central Florida4353 Scorpius StreetResearch ISuite 231FL 32816 OrlandoUSA Burnett School of Biomedical Sciences University of Central Florida6900 Lake Nona BlvdFL 32827 OrlandoUSA Department of Biomedical Engineering Polytechnic University of Puerto Rico37700918Ponce de LeonSan JuanPuerto Rico Department of Electrical and Computer Engineering University of Central Florida4238 Scorpius StreetFL 32816 OrlandoUSA Department of Materials Science and Engineering University of Central Florida12760 Pegasus DriveEngineering ISuite 207FL 32816 OrlandoUSA

Benchtop tissue cultures have become increasingly complex in recent years,as more on-a-chip biological technologies,such as microphysiological systems(MPS),are developed to incorporate cellular constructs that more accurately represent their respective biological *** MPs have begun facilitating major breakthroughs in biological research and are poised to shape the field in the coming *** biological systems require integrated sensing modalities to procure complex,multiplexed datasets with unprecedented combinatorial biological *** this work,we expanded upon our polymer-metal biosensor approach by demonstrating a facile technology for compound biosensing that was characterized through custom modeling *** reported herein,we developed a compound chip with 3D microelectrodes,3D microfluidics,interdigitated electrodes(IDEs)and a *** chip was subsequently tested using the electrical/electrochemical characterization of 3D microelectrodes with 1 kHz impedance and phase recordings and IDE-based high-frequency(-1 MHz frequencies)impedimetric analysis of differential localized temperature recordings,both of which were modeled through equivalent electrical circuits for process parameter ***,a simplified antibody-conjugation strategy Was employed for a similar IDE-based analysis of the implications of a key analyte(L-glutamine)binding to the equivalent electrical ***,acute microfluidic perfusion modeling was performed to demonstrate the ease of microfluidics integration into such a polymer-metal biosensor platform for potential complimentary localized chemical ***,our work demonstrates the design,development,and characterization of an accessibly designed polymer-metal compound biosensor for electrogenic cellular constructs to facilitate comprehensive MPS data collection.

关键词： polymer recording breakthrough

Best Ways to Develop Company Visits

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Journal of Tourism and Hospitality Management 2015年第1期3卷 41-44页

作者： didier Roche La Rochelle Business School La Rochelle France

Nowadays, company visit seems to be a growing and changing market. Firms have switched from transactional marketing, the aim of which is to do business, to relationship marketing, which takes into consideration the customer as a real person. Finns now understand that in order to do business, customers must be well treated. Customer satisfaction is therefore very important, and that is the reason why managers are now opening their companies to customers. However, opening finns to the public cannot be improvised. This requires even now high technical tools. The purpose of this paper is to show how to implement successfully and effectively the company visit on a territory. In the first part, we define what company visit is. In the second part, we analyze the perspectives of six territorial advisers from several chambers of commerce （the body responsible for assisting companies in France）. Thanks to their expertise, it is possible atter analysing their discourse to propose methods to better develop company visits.

关键词： industrial tourism company visits qualitative study

Perinatal nutritional programming of health and metabolic adult disease

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World Journal of Diabetes 2011年第9期2卷 133-136页

作者： didier Vieau Perinatal Environment and Growth Laboratory (EA4489) Lille-North of France University Maternal Perinatal Undernutrition Team University of Sciences and Technologies of LilleFlat SN42nd stair59655 Villeneuve d'Ascq CedexFrance

Data indicate that perinatal nutritional insults not onlyhave short-term consequences on the growth velocity of the fetus/neonate but also sensitize to the development of metabolic adult *** pathophysiological mechanisms involved in the so-called "Developmental Origin of Health and Adult Diseases" are still largely unknown and depend on the type of alteration (nutritional,psychological,endocrine disruptors,etc.),its intensity and duration,species,sex and the time during which it is *** stress,via disturbances of both hy-pothalamo-pituitary-adrenal (HPA) axis and sympathoadrenal-system (SAS),as well as brain-adipose axis and pancreas alterations could play a crucial ***,it has been demonstrated that perinatal insults may be transmitted transgenerationally,suggesting that these long-term consequences may be inherited via epigenetic ***,since the placenta has been demonstrated to be sensitive to perinatal nutritional manipulations,the identification of placental markers may thus represent an important new avenue to identify the more susceptible babies prone to developing meta-bolic diseases.

关键词： Nutritional programming Epigenetic Metabolic diseases Perinatal stress Placenta Transgenerational effect Mitochondria Brain-adipose axis

Treatment of Acute Variceal Bleeding

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肝脏 2002年第S1期7卷 3-8页

作者： didier LEBREC Laboratoired’H啨modynamiqueSplanchniqueetdeBiologieVasculaire

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Sodium-glucose cotransporter-2 inhibitor use in kidney transplant recipients

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World Journal of Transplantation 2023年第5期13卷 239-249页

作者： Pavithra Ramakrishnan Neetika Garg Samantha Pabich didier A Mandelbrot Kurtis J Swanson Department of Medicine University of MinnesotaMinneapolisMN 55455United States Department of Medicine University of Wisconsin School of Medicine and Public HealthMadisonWI 53705United States

Sodium-glucose cotransporter-2 inhibitors(SGLT2i)are novel oral hypoglycemic agents garnering much attention for their substantial *** recent data have positioned SGLT2i at the forefront of diabetic chronic kidney disease(CKD)and heart failure ***2i use post-kidney transplant is an emerging area of *** from this mini review include the following:Empagliflozin is the most prescribed SGLT2i in kidney transplant recipients(KTRs),median time from transplant to initiation was 3 years(range:0.88-9.6 years).Median baseline estimated glomerular filtration rate(eGFR)was 66.7 mL/min/1.73 m2(range:50.4-75.8).Median glycohemoglobin(HgbA1c)at initiation was 7.7%(range:6.9-9.3).SGLT2i were demonstrated to be effective short-term impacting HgbA1c,eGFR,hemoglobin/hematocrit,serum uric acid,and serum magnesium *** are shown to be safe in KTRs with low rates of infections,hypoglycemia,euglycemic diabetic ketoacidosis,and stable tacrolimus *** data is needed to demonstrate long-term ***2i appear to be safe,effective medications for select *** present literature,though limited,is founded on precedent robust research in CKD patients with *** research/utilization of SGLT2i is vital to not only identify long-term patient,graft and cardiovascular outcomes of these agents,but also to augment management in KTRs.

关键词： Sodium glucose cotransporter-2 Sodium glucose cotransporter-2 inhibitor Kidney transplantation Diabetes Post-transplant diabetes mellitus New onset diabetes after transplant