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霸王妖姬

霸王妖姬

Reactivity of Nanostructured MnO_2 in Alkaline Medium Studied with a Microcavity Electrode: Effect of Oxidizing Agent

作者：塞西尔·b·戴米尔 cecil b.·Demille导演

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Journal of Materials Science & Technology 2011年第7期27卷 585-593页

作者： L.benhaddad L.Makhloufi b.Messaoudi1 K.Rahmouni H.Takenouti Laboratoire de Technologie des Matériaux et Génie des Procédés (LTMGP) Département de Génie des Procédés. Université A. MiraRoute de Targa Ouzemmour06000 BéjaiaAlgeria UPR 15 du cNRS LISE-Laboratoire Interfaces et Systèmes Electrochimiques UPMC University Paris 06Case 133 4 place Jussieu 75252 Paris Cedex 05 France UPR 15 du cNRS LISE-Laboratoire Interfaces et Systèmes Electrochimiques UPMC University Paris 06Case 1334 place Jussieu 75252 Paris Cedex 05France

The synthesis of MnO2 powders by hydrothermal method with different oxidizing agents has been successfully achieved. The characterizations by scanning electron microscopy, energy-dispersive X-ray analyses, transmission electron microscopy, and X-ray diffraction techniques confirm the synthesis of nanostructured γ-MnO2 powders. The electrochemical reactivity of these powders in 1 mol/l KOH is investigated by cyclic voltammetry and electrochemical impedance spectroscopy （EIS） by using microcavity electrode. The results reveal that the MnO2 synthesized with Na2S2O8 shows the highest electrochemical reactivity in the test medium. This is due both to its large expanded surface area and its crystallographic variety γ-MnO2 formed in the matrix of ramsdellite, which is largely used as cathodic material for primary batteries. However, the presence of pyrolusite in the structure of γ-MnO2 synthesized with （NH4）2S2O8 decreases its electrochemical reactivity due to its narrow 1×1 size tunnel, which hinders the protons insertion.

关键词： Hydrothermal processing Electrochemical impedance spectroscopy (EIS) cyclic voltammetry X-ray diffraction γ-MnO2

RhizoVision crown:An Integrated Hardware and Software Platform for Root crown Phenotyping

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Plant Phenomics 2020年第1期2卷 25-39页

作者： Anand Seethepalli Haichao Guo Xiuwei Liu Marcus Griffiths Hussien Almtarfi Zenglu Li Shuyu Liu Alina Zare Felix b.Fritschi Elison b.blancaflor Xue-Feng Ma Larry M.York Noble Research Institute LLC2510 Sam Noble ParkwayArdmoreOK 73401USA Division of Plant Sciences University of MissouriColumbiaMO 65201USA crop and Soil Sciences University of GeorgiaAthensGA 30602USA Texas A&M AgriLife Research Texas A&M University SystemAmarilloTX 79106USA Department of Electrical and computer Engineering University of FloridaGainesvilleFL 32601USA

Root crown phenotyping measures the top portion of crop root systems and can be used for marker-assisted breeding,genetic mapping,and understanding how roots influence soil resource *** imaging protocols and image analysis programs exist,but they are not optimized for high-throughput,repeatable,and robust root crown *** RhizoVision crown platform integrates an imaging unit,image capture software,and image analysis software that are optimized for reliable extraction of measurements from large numbers of root *** hardware platform utilizes a backlight and a monochrome machine vision camera to capture root crown *** RhizoVision Imager and RhizoVision Analyzer are free,open-source software that streamline image capture and image analysis with intuitive graphical user *** RhizoVision Analyzer was physically validated using copper wire,and features were extensively validated using 10,464 groundtruth simulated images of dicot and monocot root *** platform was then used to phenotype soybean and wheat root crowns.A total of 2,799 soybean(Glycine max)root crowns of 187 lines and 1,753 wheat(Triticum aestivum)root crowns of 186 lines were *** component analysis indicated similar correlations among features in both *** maximum heritability was 0.74 in soybean and 0.22 in wheat,indicating that differences in species and populations need to be *** integrated RhizoVision crown platform facilitates high-throughput phenotyping of crop root crowns and sets a standard by which open plant phenotyping platforms can be benchmarked.

关键词： crown utilize intuitive

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天空趣谈

天空趣谈

The role and significance of Magnesium in modern day research-A review

作者： b.M.·帕克(b.M. Parker)

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Journal of Magnesium and Alloys 2022年第1期10卷 1-65页

作者： S V Satya Prasad S b Prasad Kartikey Verma Raghvendra Kumar Mishra Vikas Kumar Subhash Singh Department of Production and Industrial Engineering National Institute of Technology JamshedpurJharkhand831014India Department of chemical Engineering Indian Institute of TechnologyKanpur208016India Enhanced composites and Structures center School of AerospaceTransport and ManufacturingCranfield UniversityBedfordshire MK43 OALUK Department of Automotive Technology Mechanical Department DivisionFederal TVET instituteAddis AbabaEthiopia

Magnesium is one of the largely available elements in the earth’s crust. It has a low structural density with high specific strength. This unique material property has forced an increase in the use of magnesium and its alloys in various applications pertaining to industrial sector,automobiles, aerospace and biomedical. Since magnesium is a highly reactive metal, it is prone to higher rate of corrosion as compared to its counterparts. Thus, it is essential to analyze the corrosion behavior of magnesium and its alloys in its applications. An appropriate process is to be followed in the design and development of magnesium alloys which overcome the limitations of magnesium and enhance the desired material properties in accordance to their applications. This review paper summarizes the importance of magnesium and its material properties. The influence of various alloying elements on the mechanical properties of magnesium is reviewed. The broad classification of Mg alloys and their behavioral trends are detailed. The corrosion behavior of magnesium and the influence of corrosion products on the material characteristics of magnesium, in aqueous medium, are discussed. The manufacturing techniques of magnesium alloys along with the secondary techniques are also covered. The various applications and the limitations of magnesium in these applications are covered. A complete section is dedicated towards detailing the recent trends of magnesium(Mg) alloys, i.e., the biodegradable nature and applications of Mg alloys. The influence of biocorrosion on Mg alloys and techniques to overcome it have been deliberated. This paper provides a thorough review on recent developments of magnesium with respect to engineering applications.

关键词： Magnesium alloys biodegradable alloys Magnesium corrosion biocorrosion

Mineral composition of Loess-Paleosol Samplesfrom the Loess Plateau of china and Its Environmental Significance

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chinese Journal Of Geochemistry 1994年第1期13卷 61-72页

作者：郑洪汉 b.K.G.THENG 等 GuangzhouInstituteofNewTechniquesforGeology ChineseAcademyofSciencesWushanGuangzhou510640 LandcareR

34 samples of loess-paleosol from the Luochuan and kifeng sections in the Loess Plateau, north-ern china were separated into sand, silt and clay fractions and analyzed for their mineral composi -tions. The results indicate that there is almost no difference between loess and paleosol in mineralcomposition. Major mineral species are quartz, mica, feIdspar and chlorite, accounhng for about88-92% of the total, other minerals are kandite, smectite, vermiculite and a few heavy minerals. Thecalcite, magnetite and hematite were not taken into consideration because of their removal in the pro-cess of sample preparation. The main difference with respect to the mineral composition of samplescollected from different sections and different stratigraphic leveIs lies in the amount and grain sise ofminerals hosted. comparisons between the Luochuan section and the kifeng section, between paleosoland loess and between the upper part and the lower part of some paleosol layers show that the for-mers contain less feldspar but more mica and vermiculite and are finer in grain sise, indicahng theco-occurrence of both biochemical weathering process responsible for mineral change and physicalweathering process leading to grain-stie change during the soiI-forming processes. This result favourssuch an explanation of the soi1-forming mechanism that loess deposition and paleosol developmentoccurred synchronously, though the rate of soil formation was greater than that of loess deposition,thus leading to soil development.

关键词：古土壤黄土高原成壤过程矿物组成环境标志黄土

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普通物理学（修订本）第2卷第1分册

普通物理学（修订本）第2卷第1分册

1965年

作者： c·З·福里斯 A·b·季莫列娃梁宝洪译

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英法海战

英法海战

A Pierre Robin Syndrome with Absent Anterior 2/3 Tongue—A case Report

丛书名：航海的人们丛书

1986年

作者：（美）A.b.c.惠普尔李安林秦祖祥泽

本书是《航海的人们》丛书中的一本，这是一本通俗性的海洋历史知识读物。作者以通俗、浅显、生动的文字，描述了十八世纪英、法间的几次大海战。并着重介绍了英国海军名将纳尔逊的战绩及其对英国海军的贡献。作者笔下的海战场面宏伟壮... 详细信息

ISBN: (纸本)5193·0353

本书是《航海的人们》丛书中的一本，这是一本通俗性的海洋历史知识读物。作者以通俗、浅显、生动的文字，描述了十八世纪英、法间的几次大海战。并着重介绍了英国海军名将纳尔逊的战绩及其对英国海军的贡献。作者笔下的海战场面宏伟壮丽、紧张激烈，极为吸引人。其中1798年的尼罗河之战，拿破仑的法国海军惨败，几乎全军覆没。在特拉法尔加海战中，双方激战到最后，伤亡惨重，结果法舰司令投降，英舰司令纳尔逊阵亡。本书既具有知识性，又具有趣味性，适合青少年阅读，并可供历史研究人员及军事部门参考。

关键词：军事欧洲

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International Journal of Otolaryngology and Head & Neck Surgery 2015年第6期4卷 417-422页

作者： K. Surender K. Vasudev b. balaram c. H. Vijay Raj Lingaiah Jadi Department of Pediatrics Kakatiya Medical College MGM Hospital Warangal India Department of ENT & HNS Chalmeda Anand Rao Institute of Medical Sciences Karimnagar India

The triad of micrognathia, glossoptosis and airway obstruction originally described in 1923 by Pierre Robin, is known as Robin sequence (or Pierre robin sequence “PRS”). PRS is characterized by micrognathia (small and symmetrical receded mandible), glossoptosis (tongue of variable size falls backwards into the post pharyngeal wall), and cleft palate (U or V shaped). We report a case of 2 hours old newborn presented with micrognathia, retrognathia, and glossoptosis and absent anterior two thirds of tongue.

关键词： Micrognathia Glossoptosis Pierre Robin Sequence