Poster about atomic nanolines
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1) Bismuth nanolines formed on a silicon surface can template the growth of perfectly straight atomic chains exceeding 1 micrometer in length. 2) Exposing the bismuth nanolines to hydrogen strips the bismuth, leaving behind a stable silicon-only template without defects called the "Haiku core structure". 3) This novel silicon-only template provides a way to directly observe the Haiku structure and could be used to determine the transport properties of one-dimensional structures grown on its surface.
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a ) - ~ { ~ , " b ) , , :i:: ::'
'::ii~ :~ilili!
~i ~
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a ) - ~ { ~ , " b ) , , :i:: ::'
'::ii~ :~ilili!
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Thermionic (vacuum tube) diodes and solid state (semiconductor) diodes were both developed in the early 1900s as radio receiver detectors. Vacuum tube diodes were more commonly used in radios until the 1950s because early semiconductor diodes were less stable. Semiconductor diodes are made from materials like silicon and germanium that have a particular atomic structure making them able to conduct electricity in only one direction, functioning as a diode. The diode's one-way conduction property allows it to be used for rectification of alternating current to direct current among other applications.
SUPERJUNCTION IN Silicon Carbide Diodes
This document summarizes a study of a 4H-SiC superjunction power diode through simulation. It discusses the methodology, which involves a literature survey and simulations using semiconductor simulation software. It provides an introduction to superjunction concepts and comparisons between different materials like SiC and Si. The results section shows electric field simulations of Si diodes with and without superjunction structures. The work plan is to extend the simulations to 4H-SiC diodes and later to SiC MOSFETs.
Semiconductor physics
The document discusses the physics of semiconductors including PN junction diodes and resistors. It covers semiconductor fundamentals like doping and intrinsic nature. It describes how doping materials like phosphorus or boron create N-type or P-type semiconductors. When an N-type and P-type material come into contact, a PN junction is formed with a depletion region and electric field. A PN junction acts as a switch that only allows current in one direction depending on whether it is forward or reverse biased.
2012 tus lecture 7
This document provides an overview of various nanotechnology applications including DNA sequencing using nanopores, filtration, uses in clothing and sports, composites, nanomedicine, superconductors, magnetic nanowires, ferroelectrics, and dielectric nanostructures. It also discusses the business of nanotechnology and provides examples of research on growing superconducting lead nanowires, fabricating yttrium barium copper oxide superconductor nanowires, investigating the magnetic properties of ferromagnetic nanowires, and developing ferroelectric nanotubes and metamaterials using dielectric nanostructures.
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Vulgarization poster about the Scanning Tunneling microscopy
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Vulgarization poster about supraconductivity
Basic poster explaining the main concept of supraconductivity, cooper pairs and scanning tunneling microscopy.
Poster about atomic nanolines based on silicon only structures
Achievement of fabricating and understanding nanostructure will able us to build new electronic component. This work show our analysis of one structure we found in Silicon based on the Bismuth Nanolines.
Breakjunction for molecular contacting
This document describes an experiment using electromigration to create break junctions for studying molecular electronics. The experiment uses electromigration to controllably break thin gold wires, creating nanoscale gaps. Conductance is measured through the gaps, showing quantization in units of the conductance quantum. Gap sizes were estimated from SEM images, ranging from less than 10nm to over 20nm. However, the feedback algorithm for controlling electromigration was unable to quickly detect the breaking point or prevent runaway breaking. Improved feedback methods are needed to better control gap formation and size.
Thin epitaxial ferromagnetic metal films on GaAs(001) for spin injection and ...
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Introduction to Python and Matplotlib
A short introduction to Python for beginner showing principles of the interactive ipython shell and plotting with matplotlib
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Fabrication and characterization of one-dimensional solid-state model systems...
This document summarizes research on fabricating and characterizing one-dimensional nanoline structures on silicon. It describes how bismuth nanolines were self-assembled through deposition on a silicon surface, forming constant-width chains over micrometer lengths. After removing the bismuth, the silicon surface formed a template of "Haiku stripes" consisting of hydrogen-terminated silicon dimers. Alternating patterns of these dimers were also created through voltage control. The document outlines additional methods to synthesize nanoline structures like "Haiku dangling bond rows" and characterizes their properties through microscopy and spectroscopy. The goal is to use these one-dimensional templates to assemble and study molecular and atomic chains with potential applications in nanotechnology.
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Vulgarization poster about the Scanning Tunneling microscopy
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Poster about atomic nanolines based on silicon only structures
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Presentation Prix Nobel 2007 sur la magnétorésistance gigantesque
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BIRDS DIVERSITY OF SOOTEA BISWANATH ASSAM.ppt.pptx
Ahota Beel, nestled in Sootea Biswanath Assam , is celebrated for its extraordinary diversity of bird species. This wetland sanctuary supports a myriad of avian residents and migrants alike. Visitors can admire the elegant flights of migratory species such as the Northern Pintail and Eurasian Wigeon, alongside resident birds including the Asian Openbill and Pheasant-tailed Jacana. With its tranquil scenery and varied habitats, Ahota Beel offers a perfect haven for birdwatchers to appreciate and study the vibrant birdlife that thrives in this natural refuge.
Mechanisms and Applications of Antiviral Neutralizing Antibodies - Creative B...
Neutralizing antibodies, pivotal in immune defense, specifically bind and inhibit viral pathogens, thereby playing a crucial role in protecting against and mitigating infectious diseases. In this slide, we will introduce what antibodies and neutralizing antibodies are, the production and regulation of neutralizing antibodies, their mechanisms of action, classification and applications, as well as the challenges they face.
Pests of Storage_Identification_Dr.UPR.pdf
InIndia-post-harvestlosses-unscientificstorage,insects,rodents,micro-organismsetc.,accountforabout10percentoftotalfoodgrains
Graininfestation
Directdamage
Indirectly
•theexuviae,skin,deadinsects
•theirexcretawhichmakefoodunfitforhumanconsumption
About600speciesofinsectshavebeenassociatedwithstoredgrainproducts
100speciesofinsectpestsofstoredproductscauseeconomiclosses
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...
Current descriptions of immersive learning cases are often difficult or impossible to compare. This is due to a myriad of different options on what details to include, which aspects are relevant, and on the descriptive approaches employed. Also, these aspects often combine very specific details with more general guidelines or indicate intents and rationales without clarifying their implementation. In this paper we provide a method to describe immersive learning cases that is structured to enable comparisons, yet flexible enough to allow researchers and practitioners to decide which aspects to include. This method leverages a taxonomy that classifies educational aspects at three levels (uses, practices, and strategies) and then utilizes two frameworks, the Immersive Learning Brain and the Immersion Cube, to enable a structured description and interpretation of immersive learning cases. The method is then demonstrated on a published immersive learning case on training for wind turbine maintenance using virtual reality. Applying the method results in a structured artifact, the Immersive Learning Case Sheet, that tags the case with its proximal uses, practices, and strategies, and refines the free text case description to ensure that matching details are included. This contribution is thus a case description method in support of future comparative research of immersive learning cases. We then discuss how the resulting description and interpretation can be leveraged to change immersion learning cases, by enriching them (considering low-effort changes or additions) or innovating (exploring more challenging avenues of transformation). The method holds significant promise to support better-grounded research in immersive learning.
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Presentation given at the official farewell of Prof Ken Gillet at Wageningen on 13 June 2024
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Discovery of An Apparent Red, High-Velocity Type Ia Supernova at 𝐳 = 2.9 wi...
We present the JWST discovery of SN 2023adsy, a transient object located in a host galaxy JADES-GS
+
53.13485
−
27.82088
with a host spectroscopic redshift of
2.903
±
0.007
. The transient was identified in deep James Webb Space Telescope (JWST)/NIRCam imaging from the JWST Advanced Deep Extragalactic Survey (JADES) program. Photometric and spectroscopic followup with NIRCam and NIRSpec, respectively, confirm the redshift and yield UV-NIR light-curve, NIR color, and spectroscopic information all consistent with a Type Ia classification. Despite its classification as a likely SN Ia, SN 2023adsy is both fairly red (
�
(
�
−
�
)
∼
0.9
) despite a host galaxy with low-extinction and has a high Ca II velocity (
19
,
000
±
2
,
000
km/s) compared to the general population of SNe Ia. While these characteristics are consistent with some Ca-rich SNe Ia, particularly SN 2016hnk, SN 2023adsy is intrinsically brighter than the low-
�
Ca-rich population. Although such an object is too red for any low-
�
cosmological sample, we apply a fiducial standardization approach to SN 2023adsy and find that the SN 2023adsy luminosity distance measurement is in excellent agreement (
≲
1
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) with
Λ
CDM. Therefore unlike low-
�
Ca-rich SNe Ia, SN 2023adsy is standardizable and gives no indication that SN Ia standardized luminosities change significantly with redshift. A larger sample of distant SNe Ia is required to determine if SN Ia population characteristics at high-
�
truly diverge from their low-
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counterparts, and to confirm that standardized luminosities nevertheless remain constant with redshift.
The cost of acquiring information by natural selection
This is a short talk that I gave at the Banff International Research Station workshop on Modeling and Theory in Population Biology. The idea is to try to understand how the burden of natural selection relates to the amount of information that selection puts into the genome.
It's based on the first part of this research paper:
The cost of information acquisition by natural selection
Ryan Seamus McGee, Olivia Kosterlitz, Artem Kaznatcheev, Benjamin Kerr, Carl T. Bergstrom
bioRxiv 2022.07.02.498577; doi: https://doi.org/10.1101/2022.07.02.498577
快速办理(UAM毕业证书)马德里自治大学毕业证学位证一模一样
学校原件一模一样【微信：741003700 】《(UAM毕业证书)马德里自治大学毕业证学位证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
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二.真实使馆公证(即留学回国人员证明,不成功不收费)
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四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
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◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
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◇回国时间很长，忘记办理；
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◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
Randomised Optimisation Algorithms in DAPHNE
Slides from talk:
Aleš Zamuda: Randomised Optimisation Algorithms in DAPHNE .
Austrian-Slovenian HPC Meeting 2024 – ASHPC24, Seeblickhotel Grundlsee in Austria, 10–13 June 2024
https://ashpc.eu/
Sustainable Land Management - Climate Smart Agriculture
Sustainable Land Management - Climate Smart AgricultureInternational Food Policy Research Institute- South Asia Office
PPT on Sustainable Land Management presented at the three-day 'Training and Validation Workshop on Modules of Climate Smart Agriculture (CSA) Technologies in South Asia' workshop on April 22, 2024.
Signatures of wave erosion in Titan’s coasts
The shorelines of Titan’s hydrocarbon seas trace flooded erosional landforms such as river valleys; however, it isunclear whether coastal erosion has subsequently altered these shorelines. Spacecraft observations and theo-retical models suggest that wind may cause waves to form on Titan’s seas, potentially driving coastal erosion,but the observational evidence of waves is indirect, and the processes affecting shoreline evolution on Titanremain unknown. No widely accepted framework exists for using shoreline morphology to quantitatively dis-cern coastal erosion mechanisms, even on Earth, where the dominant mechanisms are known. We combinelandscape evolution models with measurements of shoreline shape on Earth to characterize how differentcoastal erosion mechanisms affect shoreline morphology. Applying this framework to Titan, we find that theshorelines of Titan’s seas are most consistent with flooded landscapes that subsequently have been eroded bywaves, rather than a uniform erosional process or no coastal erosion, particularly if wave growth saturates atfetch lengths of tens of kilometers.
Gadgets for management of stored product pests_Dr.UPR.pdf
Insectsplayamajorroleinthedeteriorationoffoodgrainscausingbothquantitativeandqualitativelosses
Wellprovedthatnogranariescanbefilledwithgrainswithoutinsectsastheharvestedproducecontainegg(or)larvae(or)pupae(or)adultinsectinthembecauseoffieldcarryoverinfestationwhichcannotbeavoidedindevelopingcountrieslikeIndia
Simpletechnologiesfortimelydetectionofinsectsinthestoredproduceandtherebyplantimelycontrolmeasures
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Gadgets for management of stored product pests_Dr.UPR.pdf
Poster about atomic nanolines
- 1. Drawn freely with 1D templates for atomic chains on Si(001) ¹ Université de Genève, DPMC ² Department of Physics & Astronomy, UCL and LCN, London 1 1 11 1 2 F. Bianco, J. Owen, S. Köster, D. Mazur, D. Bowler and C. Renner 1 Haiku stripe Properties Bismuth nanolineMotivations 5 5 7 5 7 Haiku structure Composed of 5- and 7- fold rings of Si A Haiku (з ợ ) is a Japanese poem with 5-7-5 syllables Exactly 4 Si dimers wide (15.4 Å) Extends 5 layers below the surface Double row of Bi dimers perpendicular to Si dimers Review article : J. Mat. Sci 41 (14) 4568 (2006) Probe 1D physics experimentally Provide new way of growing atomic chains Alternative to vincinal surfaces Interconnects for novel electronics Allow the growth of 1D structures independent of step edges Perfectly straight, no kinks Can exceed 1µm in length Self-assembled structure with very few defects Stable up to 500°C in UHV Adsorption of metal along or in between the Bi dimers Matches DFT simulation very well State in the middle of structure seen in empty states imaging Many favorable sites for metal adsorption predicted by computation Best explained by removing Bi from Haiku structure RHEED shows an arc from a 1D structure, no more Bi peaks in XPS V = -3.0 V, I = 250 pA, T = 77 K V = -3.0 V, I = 250 pA, T = 77 K 古池や 蛙飛込む 水の音 * old pond... a frog leaps in water’s sound * Bi dimers are stripped by H Forms by exposing Bi nanolines to hydrogen Si monohydride surface passive in air, therefore likely to be stable in air Same structural properties as the Haiku core of Bi nanoline Provide direct observation of the Haiku structure Novel Si-only template, without any defects Stable up to 400°C in UHV Surface analysis After Bi deposition After H₂ deposition Binding energy Counts/s Bi Bi Si Si After H₂ Before H₂ Bi XPS RHEED Side view Outlook Determine transport properties of the templates Dope the Haiku stripes chemically or electrostatically Characterise templating properties Look for metallic properties Expose sample to air to confirm stability Haiku core structure - 0.3 V Filled states V = -2.9 V, I = 150 pA, T = 77 KV = - 2.5 V, I = 100 pA, T = 77 K Empty states + 1.8 V + 2.0 V + 2.5 V I = 150 pA, T = 77 K V = +2.0 V, I = 150 pA, T = 77 K