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Single Frequency WAAS Augmentation Observations (L1 vs. L5) on a Ground Based GPS L1 C/A Solution

Positioning 2014年第3期5卷 70-83页

作者： marc-antoine fortin Jean-Christophe Guay René Jr. Landry école de Technologie Supérieure (éTS) Montréal Canada école de Technologie Supérieure (éTS) Montréal Canada

This paper presents observations on the WAAS L1 and L5 signals quality and their impact on the robustness of the navigation solution by quantifying the contributions of each broadcasted differential correction. This work is undertaken with the intent of defining performance benefits of L5 by dual frequency WAAS users and is to provide useful material for Minimum Operational Performance Standard (MOPS) development. In this perspective, a study of the WAAS signal characteristics is first carried out. The information gathered is then used to compare various GPS solutions in terms of frequency diversity, satellite diversity, pseudorange noise and different signal corrections and their impacts. These solutions are compared against a reference standalone GPS solution. All statistics are computed with respect to a post-processed Novatel Waypoint Real-Time Kinematics (RTK) GPS L1/L2 semi-codeless static solution, considered as the reference. A discussion on some simplifications with respect to specifications (i.e. MOPS) that could be considered by receiver manufacturers closes the paper. It is confirmed that the current WAAS navigation message definition is the same on both the L1 and L5 frequencies, the latter further being Manchester coded, thus avoiding data ambiguity. The +5 dB SNR on L5 has minor impacts in terms of reliability and continuous availability in the presented scenarios, but would become especially beneficial in hostile environments, despite a greater number of pulsed interferers. Another demonstration is that the WAAS message varies slightly from one WAAS satellite to another, even if corrections are generated centrally. Finally, it is observed that WAAS and GPS signals pseudorange noise are comparable on a “per frequency” basis.

关键词： GPS L1 WAAS L1 WAAS L5 MOPS Pseudorange Noise

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Improving the radiopacity of Fe-Mn biodegradable metals by magnetron-sputtered W-Fe-Mn-C coatings:Application for thinner stents

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Bioactive Materials 2022年第6期7卷 64-70页

作者： Samira Ravanbakhsh Carlo Paternoster Gianni Barucca Paolo Mengucci Sofia Gambaro Theophraste Lescot Pascale Chevallier a marc-Andre fortin Diego Mantovani Laboratory for Biomaterials and Bioengineering Canada Research Chair I in Biomaterials and Bioengineering for the Innovation in SurgeryDepartment of Min-Met-Materials EngineeringResearch Center of CHU de QuebecDivision of Regenerative MedicineLaval UniversityQuebec CityQuebec G1V 0A6Canada Laboratory for Biomaterials in Imaging(BIM) Axe Medecine RegeneratriceCentre Hospitalier Universitaire(CHU)de Quebec-Universite Laval2705boul.Laurier(T1-61a)QuebecG1V 4G2Canada Department of Materials Environmental Sciences and Urban PlanningUniversita Politecnica delle Marchevia Brecce Bianche 1260131AnconaItaly National Research Council Institute of Condensed Matter Chemistry and EnergyCNR-ICMATEVia de Marini 616149GenovaItaly Departement de Genie des Mines de la Metallurgie et des MateriauxCentre de Recherche sur les Materiaux Avances(CERMA)Universite LavalQuebecG1V 0A6Canada Axe Medecine Regeneratrice Centre Hospitalier Universitaire(CHU)de Quebec-Universite Laval2705boul.Laurier(T1-61a)QuebecG1V 4G2Canada

In this exploratory work,micrometric radiopaque W-Fe-Mn-C coatings were produced by magnetron sputtering plasma deposition,for the first time,with the aim to make very thin Fe-Mn stents trackable by *** power of Fe-13Mn-1.2C target was kept constant at 400 W while that of W target varied from 100 to 400 W producing three different coatings referred to as P100,P200,*** effect of the increased W power on coatings thickness,roughness,structure,corrosion behavior and radiopacity was *** coatings showed a power-dependent thickness and W concentration,different roughness values while a similar and uniform columnar *** amorphous phase was detected for both P100 and P200 coatings while γ-Fe,bcc-W and W_(3)C phases found for ***,P200 and P400 showed a significantly higher corrosion rate(CR)compared to *** presence of W,W_(3)C as well as the Fe amount variation determined two different micro-galvanic corrosion mechanisms significantly changing the CR of coatings,0.26±0.02,59.68±1.21 and 59.06±1.16μm/year for P100,P200 and P400,*** P200 with its most uniform morphology,lowest roughness(RMS=3.9±0.4 nm)and good radiopacity(~6%)appeared the most suitable radiopaque biodegradable coating investigated in this study.

关键词： Fe-Mn-Based alloys Degradable coatings W-Fe-Mn-C coatings Magnetron sputtering Radiopacity Stent fluoroscopy

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植酸酶分泌型酵母工程菌的构建(英文)

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南开大学学报（自然科学版） 2002年第4期35卷 1-5页

作者：祝建洪孙建陈珈李桂兰吴卓伟王隆飞陈功 marc G fortin 李明刚南开大学分子生物学研究所天津300071

通过逆转录 PCR从无花果曲霉总 RNA中扩增出 1 .4 -kb带信号肽的植酸酶基因 ,将其克隆到穿梭表达载体 p YES2 ,构建了含有目的基因的重组质粒 p YPA1 .用 p YPA1转化酿酒酵母 INVSc1菌株 ,成功地构建了能分泌活性植酸酶的工程菌株 .该... 详细信息

通过逆转录 PCR从无花果曲霉总 RNA中扩增出 1 .4 -kb带信号肽的植酸酶基因 ,将其克隆到穿梭表达载体 p YES2 ,构建了含有目的基因的重组质粒 p YPA1 .用 p YPA1转化酿酒酵母 INVSc1菌株 ,成功地构建了能分泌活性植酸酶的工程菌株 .该菌株的成功构建为饲料和食品添加剂以及解磷工程菌肥的开发奠定了基础 .

关键词：分泌型酵母工程菌植酸酶酿酒酵母基因克隆基因表达重组质粒

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