Zipping Up Ni-Fe Hydroxide-Coated Hematite Nanowires
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This document summarizes research on a hematite photoanode coated with a nickel-iron hydroxide catalyst layer for water splitting. The coating was applied via a "zippering" method using sodium citrate to provide a conformal, void-free layer on hematite nanowire arrays. Characterization showed the coating achieved intimate contact between the hematite and catalyst. Photoelectrochemical tests demonstrated the coated electrode had a lower oxygen evolution reaction turn-on potential, higher charge transfer efficiency, and greater stability compared to uncoated hematite. The zippered interface improved the photoanode performance for water oxidation.
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The document summarizes research on photoferroic materials for solar cell applications. It discusses computational studies of the electronic and optical properties of three candidate photoferroic minerals: enargite, stephanite, and bournonite. The studies show they have suitable bandgaps and absorption properties. Rashba splitting was also found in bournonite. The document then discusses how defects could be tolerated in these materials through shallow defect levels related to their electronic structure. Finally, methods for further computational investigation of defects and spontaneous polarization are presented.
Nanoengineered Au-Carbon Nitride Interfaces Enhance PhotoCatalytic Pure Water...
Photocatalytic pure water splitting using solar energy is one of the promising routes to produce sustainable green hydrogen (H2). Tuning the interfacial active site density at catalytic heterojunctions and better light management are imperative to steer the structure-activity correlations to enhance the photo-efficiency of nanocomposite photocatalysts. Herein, we report the decoration of nitrogen defects-rich carbon nitride CN(T) with metallic Au nanostructures of different morphologies and sizes to investigate their influence on the photocatalytic hydrogen evolution reactions (HER). The CN(T)-7-NP nano-heterostructure comprises Au nanoparticles (NPs) of ~7 nm and thiourea-derived defective CN exhibits an excellent H2 production rate of 76.8 µmol g–1 h–1 from pure water under simulated AM 1.5 solar irradiation. In contrast to large-size Au nanorods, the high activity of CN(T)-7-NP was attributed to their strong localized surface plasmon resonance (LSPR) mediated visible absorption and interfacial charge separation. The surface ligands used to control Au nanostructures morphology were found to play a major role in the stabilization of NPs and improve interfacial charge transport between Au NPs and CN(T). First-principles calculations revealed that defects in CN and Au-CN interfacial sites in these nanocomposites facilitate the separation of e-/h+ pairs after light excitation and provide lower energy barrier pathways for H2 production by photocatalytic water splitting.
2017 ACS Spring National Meeting Presentation Slides
This document discusses strategies to improve the cycling stability of polypyrrole electrodes for supercapacitors. It summarizes that polypyrrole suffers from poor cycling stability due to structural pulverization and counter-ion drain. The author investigated using a soft functionalized exfoliated graphite substrate and immobilizing counter-ion dopants like beta-naphthalene sulfonate to address these issues. Experimental results showed the functionalized exfoliated graphite substrate and immobilized counter-ion dopant led to a polypyrrole electrode with 97% capacitance retention after 10,000 charge-discharge cycles, demonstrating excellent cycling durability.
Oce 2010 val goss
Valerie Goss presented her aims and research approach for her oral candidacy exam. She plans to use DNA origami to assemble molecular electronic components by applying small voltages to patterned silicon surfaces modified with APTES to control the reversible binding of DNA origami. She expects to obtain in situ AFM images showing changes in origami orientation with applied voltage and determine binding energies as a function of voltage. Her overall goal is to demonstrate high fidelity and controlled binding of origami nanostructures on patterned surfaces for applications in nanoelectronics.
Session_B2_Fillion.ppt
- CEA/LITEN is a research organization that works on developing new energy technologies including batteries, fuel cells, solar energy, biomass/hydrogen.
- They are looking at critical material substitutes for energy storage, conversion and transport applications to address cost and supply issues. This includes alternatives to cobalt in batteries and platinum in fuel cells.
- For solar energy, they are researching silicon nanowire and thin film technologies like CIGS as lower cost alternatives to bulk silicon, with potential efficiencies over 15%.
Effect of ordering of PtCu3 electrocatalyst structure on the stability for ox...
Presentation at the 10th European Symposium on Electrochemical Engineering, Sardinia, Italy
September 28, 2014 to October 02, 2014
Authors:
Nejc Hodnik1,2, C. Jeyabharathi1,3, K. Phani3, A. Rečnik4, M. Bele2, S. Hočevar2, M. Gaberšček2 and K. Mayrhofer1
1Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany
Department of Interface Chemistry and Surface Engineering
Electrocatalysis Group
2National Institute of Chemistry, Ljubljana, Slovenia
3CSIR-Central Electrochemical Research Institute, Tamil Nadu, India
4Jožef Stefan Institute, Ljubljana, Slovenia
graduate work
This dissertation defense summarizes Yongjia Li's doctoral research on the design of nanostructured catalyst materials. The defense included three parts: (1) using graphene as a catalyst support for hemin, which showed activity for toluene oxidation; (2) developing bimetallic nanocatalysts including Au-Pd porous structures for alcohol oxidation and Au-Cu nanostars for CO2 reduction; and (3) a plasmonic photocatalyst using Au/Pd-TiO2 nanocomposites for tandem benzimidazole synthesis. The research demonstrated how nanostructuring and composition influences catalytic activity, selectivity, and photon absorption efficiency.
Fabrication and studying the dielectric properties of (polystyrene-copper oxi...
This document summarizes a study that fabricated (polystyrene-copper oxide) nanocomposites for potential piezoelectric applications. Copper oxide nanoparticles were added to polystyrene at concentrations of 0, 4, 8 and 12 wt.%. The dielectric constant, dielectric loss, and AC electrical conductivity increased with higher copper oxide concentrations and increased frequency. The electrical resistance of the nanocomposites decreased with increasing pressure, showing piezoelectric behavior. The nanocomposites showed potential for use in piezoelectric sensors due to their sensitivity to pressure changes.
IRJET - Advances in Perovskite Solar Cells
This document summarizes recent advances in perovskite solar cells. It discusses how perovskite solar cell efficiency has rapidly increased from 3.8% in 2009 to over 24.2% today, catching up to silicon solar cells. The stability of perovskite structures depends on factors like ionicity and tolerance factor. While perovskite solar cells still face stability issues with water and temperature, encapsulation and tandem cell designs with silicon are helping to address this. Research is ongoing to improve materials, device architectures and manufacturing techniques to further increase efficiency and commercial viability of these promising thin film solar cells.
Recent progress on reduced graphene oxide....
The document summarizes recent progress on using reduced graphene oxide (rGO)-based materials as counter electrodes for dye-sensitized solar cells (DSSCs) as a cost-effective alternative to platinum. It discusses how rGO on its own is not effective as a counter electrode but that adding metal nanoparticles to rGO composites improves their catalytic activity and performance in DSSCs. The document reviews various rGO composites that have been studied, including those with silver, nickel, tungsten and platinum nanoparticles, as well as metal oxides and dichalcogenides. It compares the photovoltaic parameters of DSSCs using these rGO composite counter electrodes to those using conventional platinum counter electrodes
Summary of Wei-Ta's work
The document outlines Wei-Ta Chen's thesis on metal/semiconductor nanoheterostructures and their applications in photoconversion. It summarizes research on synthesizing Au-CdS and Au-ZnS core-shell nanocrystals with controllable shell thickness. Characterization showed enhanced optical properties and interfacial charge transfer dynamics. The structures exhibited improved photocatalytic activity for degradation of organic dyes and oxidation of methanol for fuel cells due to efficient electron-hole separation at the interface. The thesis also investigated plasmonic and charging effects of Au/TiO2 and Au/SiO2 core-shell nanoparticles for enhancing dye-sensitized solar cell performance.
Iaetsd structural and electronic properties of doped
This document summarizes simulation results on the structural and electronic properties of silicon nanowires doped with aluminum and phosphorus atoms. Key findings include:
1) Total energy decreases with more doping, indicating greater stability. Phosphorus doping provides more stability than aluminum doping.
2) Bandgap decreases or disappears with doping, increasing metallic properties. More doping leads to more conduction lines crossing the Fermi level.
3) Density of states plots show peaks shifting and changing with doping, indicating changes in electronic structure and semiconducting to metallic transition.
HYWEC (Hydrodynamics of Wave Energy Converters) Workshop at BCAM April 3-7, 2017
HYWEC (Hydrodynamics of Wave Energy Converters) Workshop at BCAM April 3-7, 2017TECNALIA Marine Energy
Tecnalia Marine took part to the Workshop HYWEC (Hydrodynamics of Wave Energy Converters) held at BCAM (Basque Centre for Applied Mathematics) in Bilbao. Here is the presentation!! Enjoy it ;)1- Introduction2- Discovery of ruthenium and Occurrence.Fro.docx
1- Introduction
2- Discovery of ruthenium and Occurrence.
From( Properties and Applications of Ruthenium ) chapter of boook
Link to citing information
https://www.intechopen.com/books/noble-and-precious-metals-properties-nanoscale-effects-and-applications/properties-and-applications-of-ruthenium
3-Chemical and physical properties
From( Properties and Applications of Ruthenium ) chapter of boook
4-Compounds of Ru (refining of the platinum-Group Metals)
(Refining of the platinum-group metals)Chapter of book
Please make this part two pages.
5- Ruthenium complexes
From( Properties and Applications of Ruthenium ) chapter of boook
6-Extraction (preparation of Ru)
1-CONCENTRATE COMPOSITION
3- SEPARATION TECHNIQUES USED IN THE REFINING OF THE PLATINUM-GROUP METALS
From (Refining of the Platinum-Group
Metals) chapter of book.
7- General applications
From( Properties and Applications of Ruthenium ) chapter of book.
8-Catalytic activity of ruthenium, general application in catalysis.
From( Properties and Applications of Ruthenium ) chapter of book.
9- Application of Ru nanoparticles in catalysis
Articles (4– 9– 6 – 19-20) that6 articles you have done.
10- Application of Ru in some other different fields.
Articles (12-14-16-17-18- last article).
11- Summary and conclusions
From( Properties and Applications of Ruthenium ) chapter of book.
12- References
Journal of
Materials Chemistry A
REVIEW
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Metallic rutheniu
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aSchool of Materials Science and Engineerin
Beijing, Beijing 100083, China. E-mail: qipe
bCenter for Programmable Materials, Schoo
Nanyang Technological University, 50 Nanya
Cite this: J. Mater. Chem. A, 2019, 7,
24691
Received 10th June 2019
Accepted 8th October 2019
DOI: 10.1039/c9ta06178a
rsc.li/materials-a
This journal is © The Royal Society of C
m-based nanomaterials for
electrocatalytic and photocatalytic hydrogen
evolution
Sumei Han,†a Qinbai Yun,†b Siyang Tu,a Lijie Zhu,c Wenbin Cao*a and Qipeng Lu *a
Developing a sustainable technology to produce hydrogen efficiently is crucial to realize the “hydrogen
economy”, which may address the growing energy crisis and environmental pollution nowadays.
Electrocatalytic and photocatalytic hydrogen evolution reactions have received great attention during
the past few decades since they can realize hydrogen production from the water splitting reaction
directly. Although platinum has been widely used as a catalyst for the electrocatalytic and photocatalytic
hydrogen evolution reaction (HER), its high cost and limited supply make it imperative to develop
alternative high-performance catalysts. Ruthenium (Ru), the cheapest one among platinum-group
metals, has been emerging as a promising candidate recently. Unti.
1- Introduction2- Discovery of ruthenium and Occurrence.Fro
1- Introduction
2- Discovery of ruthenium and Occurrence.
From( Properties and Applications of Ruthenium ) chapter of boook
Link to citing information
https://www.intechopen.com/books/noble-and-precious-metals-properties-nanoscale-effects-and-applications/properties-and-applications-of-ruthenium
3-Chemical and physical properties
From( Properties and Applications of Ruthenium ) chapter of boook
4-Compounds of Ru (refining of the platinum-Group Metals)
(Refining of the platinum-group metals)Chapter of book
Please make this part two pages.
5- Ruthenium complexes
From( Properties and Applications of Ruthenium ) chapter of boook
6-Extraction (preparation of Ru)
1-CONCENTRATE COMPOSITION
3- SEPARATION TECHNIQUES USED IN THE REFINING OF THE PLATINUM-GROUP METALS
From (Refining of the Platinum-Group
Metals) chapter of book.
7- General applications
From( Properties and Applications of Ruthenium ) chapter of book.
8-Catalytic activity of ruthenium, general application in catalysis.
From( Properties and Applications of Ruthenium ) chapter of book.
9- Application of Ru nanoparticles in catalysis
Articles (4– 9– 6 – 19-20) that6 articles you have done.
10- Application of Ru in some other different fields.
Articles (12-14-16-17-18- last article).
11- Summary and conclusions
From( Properties and Applications of Ruthenium ) chapter of book.
12- References
Journal of
Materials Chemistry A
REVIEW
P
ub
li
sh
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o
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08
O
ct
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2
01
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D
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L
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4/
7/
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1
0:
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:5
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View Article Online
View Journal | View Issue
Metallic rutheniu
S
d
S
i
s
P
Q
S
H
r
n
e
e
aSchool of Materials Science and Engineerin
Beijing, Beijing 100083, China. E-mail: qipe
bCenter for Programmable Materials, Schoo
Nanyang Technological University, 50 Nanya
Cite this: J. Mater. Chem. A, 2019, 7,
24691
Received 10th June 2019
Accepted 8th October 2019
DOI: 10.1039/c9ta06178a
rsc.li/materials-a
This journal is © The Royal Society of C
m-based nanomaterials for
electrocatalytic and photocatalytic hydrogen
evolution
Sumei Han,†a Qinbai Yun,†b Siyang Tu,a Lijie Zhu,c Wenbin Cao*a and Qipeng Lu *a
Developing a sustainable technology to produce hydrogen efficiently is crucial to realize the “hydrogen
economy”, which may address the growing energy crisis and environmental pollution nowadays.
Electrocatalytic and photocatalytic hydrogen evolution reactions have received great attention during
the past few decades since they can realize hydrogen production from the water splitting reaction
directly. Although platinum has been widely used as a catalyst for the electrocatalytic and photocatalytic
hydrogen evolution reaction (HER), its high cost and limited supply make it imperative to develop
alternative high-performance catalysts. Ruthenium (Ru), the cheapest one among platinum-group
metals, has been emerging as a promising candidate recently. Unti ...
1- Introduction2- Discovery of ruthenium and Occurrence.Fro.docx
1- Introduction
2- Discovery of ruthenium and Occurrence.
From( Properties and Applications of Ruthenium ) chapter of boook
Link to citing information
https://www.intechopen.com/books/noble-and-precious-metals-properties-nanoscale-effects-and-applications/properties-and-applications-of-ruthenium
3-Chemical and physical properties
From( Properties and Applications of Ruthenium ) chapter of boook
4-Compounds of Ru (refining of the platinum-Group Metals)
(Refining of the platinum-group metals)Chapter of book
Please make this part two pages.
5- Ruthenium complexes
From( Properties and Applications of Ruthenium ) chapter of boook
6-Extraction (preparation of Ru)
1-CONCENTRATE COMPOSITION
3- SEPARATION TECHNIQUES USED IN THE REFINING OF THE PLATINUM-GROUP METALS
From (Refining of the Platinum-Group
Metals) chapter of book.
7- General applications
From( Properties and Applications of Ruthenium ) chapter of book.
8-Catalytic activity of ruthenium, general application in catalysis.
From( Properties and Applications of Ruthenium ) chapter of book.
9- Application of Ru nanoparticles in catalysis
Articles (4– 9– 6 – 19-20) that6 articles you have done.
10- Application of Ru in some other different fields.
Articles (12-14-16-17-18- last article).
11- Summary and conclusions
From( Properties and Applications of Ruthenium ) chapter of book.
12- References
Journal of
Materials Chemistry A
REVIEW
P
ub
li
sh
ed
o
n
08
O
ct
ob
er
2
01
9.
D
ow
nl
oa
de
d
by
M
is
si
ss
ip
pi
S
ta
te
U
ni
ve
rs
it
y
L
ib
ra
ri
es
o
n
4/
7/
20
20
1
0:
07
:5
6
P
M
.
View Article Online
View Journal | View Issue
Metallic rutheniu
S
d
S
i
s
P
Q
S
H
r
n
e
e
aSchool of Materials Science and Engineerin
Beijing, Beijing 100083, China. E-mail: qipe
bCenter for Programmable Materials, Schoo
Nanyang Technological University, 50 Nanya
Cite this: J. Mater. Chem. A, 2019, 7,
24691
Received 10th June 2019
Accepted 8th October 2019
DOI: 10.1039/c9ta06178a
rsc.li/materials-a
This journal is © The Royal Society of C
m-based nanomaterials for
electrocatalytic and photocatalytic hydrogen
evolution
Sumei Han,†a Qinbai Yun,†b Siyang Tu,a Lijie Zhu,c Wenbin Cao*a and Qipeng Lu *a
Developing a sustainable technology to produce hydrogen efficiently is crucial to realize the “hydrogen
economy”, which may address the growing energy crisis and environmental pollution nowadays.
Electrocatalytic and photocatalytic hydrogen evolution reactions have received great attention during
the past few decades since they can realize hydrogen production from the water splitting reaction
directly. Although platinum has been widely used as a catalyst for the electrocatalytic and photocatalytic
hydrogen evolution reaction (HER), its high cost and limited supply make it imperative to develop
alternative high-performance catalysts. Ruthenium (Ru), the cheapest one among platinum-group
metals, has been emerging as a promising candidate recently. Unti ...
1 s2.0-s2666386421001661-main
The document describes a study that uses design of experiments (DoE) to optimize slurry-cast cathodes for solid-state batteries. Various combinations of polymer binder type and content and conductive carbon additive type and content were tested as cathode composites. Electrochemical and mechanical performance data from the experiments were analyzed using statistical software to identify optimal combinations. The predictions identified polyisobutene as the best binder and vapor-grown carbon fibers as the best additive to maximize specific capacity. Hydrogenated nitrile butadiene rubber and vapor-grown carbon fibers provided the best combination to maximize capacity retention. Additional tests were conducted to understand changes during cycling.
MEMS Chip for capturing single cells and recording ion channel currents
Santosh Pandey, Zannatul Ferdous, Marvin H. White, "Planar MEMS biochip
for recording ion-channel currents in biological cells," Proc. SPIE 5062,
Smart Materials, Structures, and Systems, (14 October 2003);
doi:
10.1117/12.514745
Subjective and Comparatively Studied of Batteries on Different Parameters Eff...
This document summarizes a research paper that conducted a subjective and comparative study of various automobile batteries. The paper analyzed 20 relevant research articles on batteries based on parameters like power output, charging time, cost, and limitations. It ranked the batteries based on these parameters and mapped the highest performing batteries for power output and charging time. The mapping showed that the sodium nickel chloride battery had the highest power output while the aluminum-ion battery had the shortest charging time. A combined experimental study of these two batteries was recommended to achieve high performance and optimize batteries for electric vehicles.
Cv panagiotis september_2016
Panagiotis Mougoyannis has experience researching materials including conducting organic polymers, titanium dioxide nanotubes, and calcium carbonate nanoparticles. He is currently a PhD student at the University of Leeds studying reactive calcium carbonate nucleation and nanoparticle growth. He holds an MSc in Advanced Technology Materials from the University of Patras and a BSc in Chemistry also from the University of Patras. He has worked on various projects involving crystal growth kinetics, electrochemical anodization, and X-ray diffraction and spectroscopy techniques.
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Nanoengineered Au-Carbon Nitride Interfaces Enhance PhotoCatalytic Pure Water...
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2017 ACS Spring National Meeting Presentation Slides
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Effect of ordering of PtCu3 electrocatalyst structure on the stability for ox...
Effect of ordering of PtCu3 electrocatalyst structure on the stability for ox...
Fabrication and studying the dielectric properties of (polystyrene-copper oxi...
Fabrication and studying the dielectric properties of (polystyrene-copper oxi...
Iaetsd structural and electronic properties of doped
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HYWEC (Hydrodynamics of Wave Energy Converters) Workshop at BCAM April 3-7, 2017
HYWEC (Hydrodynamics of Wave Energy Converters) Workshop at BCAM April 3-7, 2017
1- Introduction2- Discovery of ruthenium and Occurrence.Fro.docx
1- Introduction2- Discovery of ruthenium and Occurrence.Fro.docx
1- Introduction2- Discovery of ruthenium and Occurrence.Fro
1- Introduction2- Discovery of ruthenium and Occurrence.Fro
1- Introduction2- Discovery of ruthenium and Occurrence.Fro.docx
1- Introduction2- Discovery of ruthenium and Occurrence.Fro.docx
MEMS Chip for capturing single cells and recording ion channel currents
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Phenomics assisted breeding in crop improvement
As the population is increasing and will reach about 9 billion upto 2050. Also due to climate change, it is difficult to meet the food requirement of such a large population. Facing the challenges presented by resource shortages, climate
change, and increasing global population, crop yield and quality need to be improved in a sustainable way over the coming decades. Genetic improvement by breeding is the best way to increase crop productivity. With the rapid progression of functional
genomics, an increasing number of crop genomes have been sequenced and dozens of genes influencing key agronomic traits have been identified. However, current genome sequence information has not been adequately exploited for understanding
the complex characteristics of multiple gene, owing to a lack of crop phenotypic data. Efficient, automatic, and accurate technologies and platforms that can capture phenotypic data that can
be linked to genomics information for crop improvement at all growth stages have become as important as genotyping. Thus,
high-throughput phenotyping has become the major bottleneck restricting crop breeding. Plant phenomics has been defined as the high-throughput, accurate acquisition and analysis of multi-dimensional phenotypes
during crop growing stages at the organism level, including the cell, tissue, organ, individual plant, plot, and field levels. With the rapid development of novel sensors, imaging technology,
and analysis methods, numerous infrastructure platforms have been developed for phenotyping.
8.Isolation of pure cultures and preservation of cultures.pdf
Isolation of pure culture, its various method.
如何办理(uvic毕业证书)维多利亚大学毕业证本科学位证书原版一模一样
原版纸张【微信：741003700 】【(uvic毕业证书)维多利亚大学毕业证】【微信：741003700 】学位证，留信认证（真实可查，永久存档）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，能完美还原海外各大学 Bachelor Diploma degree, Master Degree Diploma
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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
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waterlessdyeingtechnolgyusing carbon dioxide chemicalspdf
The technology uses reclaimed CO₂ as the dyeing medium in a closed loop process. When pressurized, CO₂ becomes supercritical (SC-CO₂). In this state CO₂ has a very high solvent power, allowing the dye to dissolve easily.
Compexometric titration/Chelatorphy titration/chelating titration
Classification
Metal ion ion indicators
Masking and demasking reagents
Estimation of Magnisium sulphate
Calcium gluconate
Complexometric Titration/ chelatometry titration/chelating titration, introduction, Types-
1.Direct Titration
2.Back Titration
3.Replacement Titration
4.Indirect Titration
Masking agent, Demasking agents
formation of complex
comparition between masking and demasking agents,
Indicators/Metal ion indicators/ Metallochromic indicators/pM indicators,
Visual Technique,PM indicators (metallochromic), Indicators of pH, Redox Indicators
Instrumental Techniques-Photometry
Potentiometry
Miscellaneous methods.
Complex titration with EDTA.
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...Abdul Wali Khan University Mardan,kP,Pakistan
hematic appreciation test is a psychological assessment tool used to measure an individual's appreciation and understanding of specific themes or topics. This test helps to evaluate an individual's ability to connect different ideas and concepts within a given theme, as well as their overall comprehension and interpretation skills. The results of the test can provide valuable insights into an individual's cognitive abilities, creativity, and critical thinking skillsDeep Software Variability and Frictionless Reproducibility
Deep Software Variability and Frictionless ReproducibilityUniversity of Rennes, INSA Rennes, Inria/IRISA, CNRS
The ability to recreate computational results with minimal effort and actionable metrics provides a solid foundation for scientific research and software development. When people can replicate an analysis at the touch of a button using open-source software, open data, and methods to assess and compare proposals, it significantly eases verification of results, engagement with a diverse range of contributors, and progress. However, we have yet to fully achieve this; there are still many sociotechnical frictions.
Inspired by David Donoho's vision, this talk aims to revisit the three crucial pillars of frictionless reproducibility (data sharing, code sharing, and competitive challenges) with the perspective of deep software variability.
Our observation is that multiple layers — hardware, operating systems, third-party libraries, software versions, input data, compile-time options, and parameters — are subject to variability that exacerbates frictions but is also essential for achieving robust, generalizable results and fostering innovation. I will first review the literature, providing evidence of how the complex variability interactions across these layers affect qualitative and quantitative software properties, thereby complicating the reproduction and replication of scientific studies in various fields.
I will then present some software engineering and AI techniques that can support the strategic exploration of variability spaces. These include the use of abstractions and models (e.g., feature models), sampling strategies (e.g., uniform, random), cost-effective measurements (e.g., incremental build of software configurations), and dimensionality reduction methods (e.g., transfer learning, feature selection, software debloating).
I will finally argue that deep variability is both the problem and solution of frictionless reproducibility, calling the software science community to develop new methods and tools to manage variability and foster reproducibility in software systems.
Exposé invité Journées Nationales du GDR GPL 2024
Authoring a personal GPT for your research and practice: How we created the Q...
Thematic analysis in qualitative research is a time-consuming and systematic task, typically done using teams. Team members must ground their activities on common understandings of the major concepts underlying the thematic analysis, and define criteria for its development. However, conceptual misunderstandings, equivocations, and lack of adherence to criteria are challenges to the quality and speed of this process. Given the distributed and uncertain nature of this process, we wondered if the tasks in thematic analysis could be supported by readily available artificial intelligence chatbots. Our early efforts point to potential benefits: not just saving time in the coding process but better adherence to criteria and grounding, by increasing triangulation between humans and artificial intelligence. This tutorial will provide a description and demonstration of the process we followed, as two academic researchers, to develop a custom ChatGPT to assist with qualitative coding in the thematic data analysis process of immersive learning accounts in a survey of the academic literature: QUAL-E Immersive Learning Thematic Analysis Helper. In the hands-on time, participants will try out QUAL-E and develop their ideas for their own qualitative coding ChatGPT. Participants that have the paid ChatGPT Plus subscription can create a draft of their assistants. The organizers will provide course materials and slide deck that participants will be able to utilize to continue development of their custom GPT. The paid subscription to ChatGPT Plus is not required to participate in this workshop, just for trying out personal GPTs during it.
Unlocking the mysteries of reproduction: Exploring fecundity and gonadosomati...
The pygmy halfbeak Dermogenys colletei, is known for its viviparous nature, this presents an intriguing case of relatively low fecundity, raising questions about potential compensatory reproductive strategies employed by this species. Our study delves into the examination of fecundity and the Gonadosomatic Index (GSI) in the Pygmy Halfbeak, D. colletei (Meisner, 2001), an intriguing viviparous fish indigenous to Sarawak, Borneo. We hypothesize that the Pygmy halfbeak, D. colletei, may exhibit unique reproductive adaptations to offset its low fecundity, thus enhancing its survival and fitness. To address this, we conducted a comprehensive study utilizing 28 mature female specimens of D. colletei, carefully measuring fecundity and GSI to shed light on the reproductive adaptations of this species. Our findings reveal that D. colletei indeed exhibits low fecundity, with a mean of 16.76 ± 2.01, and a mean GSI of 12.83 ± 1.27, providing crucial insights into the reproductive mechanisms at play in this species. These results underscore the existence of unique reproductive strategies in D. colletei, enabling its adaptation and persistence in Borneo's diverse aquatic ecosystems, and call for further ecological research to elucidate these mechanisms. This study lends to a better understanding of viviparous fish in Borneo and contributes to the broader field of aquatic ecology, enhancing our knowledge of species adaptations to unique ecological challenges.
Cytokines and their role in immune regulation.pptx
This presentation covers the content and information on "Cytokines " and their role in immune regulation .
bordetella pertussis.................................ppt
Bordettela is a gram negative cocobacilli spread by air born drop let
The debris of the ‘last major merger’ is dynamically young
The Milky Way’s (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the
‘last major merger.’ Hypotheses for the origin of this component include Gaia-Sausage/Enceladus (GSE), where the progenitor
collided with the MW proto-disc 8–11 Gyr ago, and the Virgo Radial Merger (VRM), where the progenitor collided with the
MW disc within the last 3 Gyr. These two scenarios make different predictions about observable structure in local phase space,
because the morphology of debris depends on how long it has had to phase mix. The recently identified phase-space folds in Gaia
DR3 have positive caustic velocities, making them fundamentally different than the phase-mixed chevrons found in simulations
at late times. Roughly 20 per cent of the stars in the prograde local stellar halo are associated with the observed caustics. Based
on a simple phase-mixing model, the observed number of caustics are consistent with a merger that occurred 1–2 Gyr ago.
We also compare the observed phase-space distribution to FIRE-2 Latte simulations of GSE-like mergers, using a quantitative
measurement of phase mixing (2D causticality). The observed local phase-space distribution best matches the simulated data
1–2 Gyr after collision, and certainly not later than 3 Gyr. This is further evidence that the progenitor of the ‘last major merger’
did not collide with the MW proto-disc at early times, as is thought for the GSE, but instead collided with the MW disc within
the last few Gyr, consistent with the body of work surrounding the VRM.
EWOCS-I: The catalog of X-ray sources in Westerlund 1 from the Extended Weste...
Context. With a mass exceeding several 104 M⊙ and a rich and dense population of massive stars, supermassive young star clusters
represent the most massive star-forming environment that is dominated by the feedback from massive stars and gravitational interactions
among stars.
Aims. In this paper we present the Extended Westerlund 1 and 2 Open Clusters Survey (EWOCS) project, which aims to investigate
the influence of the starburst environment on the formation of stars and planets, and on the evolution of both low and high mass stars.
The primary targets of this project are Westerlund 1 and 2, the closest supermassive star clusters to the Sun.
Methods. The project is based primarily on recent observations conducted with the Chandra and JWST observatories. Specifically,
the Chandra survey of Westerlund 1 consists of 36 new ACIS-I observations, nearly co-pointed, for a total exposure time of 1 Msec.
Additionally, we included 8 archival Chandra/ACIS-S observations. This paper presents the resulting catalog of X-ray sources within
and around Westerlund 1. Sources were detected by combining various existing methods, and photon extraction and source validation
were carried out using the ACIS-Extract software.
Results. The EWOCS X-ray catalog comprises 5963 validated sources out of the 9420 initially provided to ACIS-Extract, reaching a
photon flux threshold of approximately 2 × 10−8 photons cm−2
s
−1
. The X-ray sources exhibit a highly concentrated spatial distribution,
with 1075 sources located within the central 1 arcmin. We have successfully detected X-ray emissions from 126 out of the 166 known
massive stars of the cluster, and we have collected over 71 000 photons from the magnetar CXO J164710.20-455217.
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Zipping Up Ni-Fe Hydroxide-Coated Hematite Nanowires
- 1. Dr. Tianyu LIU Prof. Yat Li Laboratory Department of Chemistry and Biochemistry University of California, Santa Cruz Dec. 2nd, 2019 EN07.01.07 Zipping Up Ni-Fe Hydroxide- Coated Hematite Nanowires
- 2. Outline p Background & Motivation p Hematite Photoanode Ø Structure Design Ø Characterizations p Photoelectrochemical Performances p Summary
- 3. Outline p Background & Motivation p Hematite Photoanode Ø Structure Design Ø Characterizations p Photoelectrochemical Performances p Summary
- 6. Outline p Background & Motivation p Hematite Photoanode Ø Structure Design Ø Characterizations p Photoelectrochemical Performances p Summary
- 7. The Design Ni-Fe Hydroxide Hematite OER Catalyst Photoanode Sodium Citrate “Zipper” ACS Energy Lett. 2019, 4, 1983-1990
- 8. The Design ACS Energy Lett. 2019, 4, 1983-1990
- 9. Synthesis ACS Energy Lett. 2019, 4, 1983-1990
- 10. Morphology p Hematite nanowire arrays p Conformal, void-free NiFe(OH)x coating ACS Energy Lett. 2019, 4, 1983-1990
- 11. Elemental Distribution ACS Energy Lett. 2019, 4, 1983-1990 Fe Ni
- 12. X-Ray Photoelectron Spectroscopy ACS Energy Lett. 2019, 4, 1983-1990 p Blue shifts of Ni 2p and Fe 2p peaks – sodium citrate coordinates hematite and NiFe(OH)x
- 13. Outline p Background & Motivation p Hematite Photoanode Ø Structure Design Ø Characterizations p Photoelectrochemical Performances p Summary
- 14. OER Turn-On Potential ACS Energy Lett. 2019, 4, 1983-1990 first-order derivative 0.53V vs. RHE p Linear scan voltammograms Adv. Funct. Mater. 2010, 20, 1099-1107
- 15. Charge Transfer Efficiency !"#$%&'(# = *+,- *+,-.-/,/ Photo-current without hole scavengers Photo-current with hole scavengers [min. recombination] ACS Energy Lett. 2019, 4, 1983-1990 * Added 0.5 M H2O2 (hole scavenger)
- 16. Stability Performance ACS Energy Lett. 2019, 4, 1983-1990 p Constant-potential stability p H2 and O2 evolution 1.23V vs. RHE Pt counter electrode
- 17. Outline p Background & Motivation p Hematite Photoanode Ø Structure Design Ø Characterizations p Photoelectrochemical Performances p Summary
- 19. Acknowledgements Dr. Mingyang Li Sun Yat-sen University, China Prof. Yexiang TongProf. Yat Li Dr. Yi Yang (UCSC), Weitao Qiu (SYU), and Dr. Chaolun Liang (SYU) Co-authors Funding • Merced nAnomaterials Center for Energy and Sensing (MACES), NNX15AQ01 • National Key Research and Development Program of China, 2016YFA0202604 • Natural Science Foundation of China (21773315) • The Fundamental Research Funds for the Central Universities (2015KCXTD029) • Guangdong Provincial Key Platform and Major Scientific Research Projects for Colleges and Universities (2018A030310300)
- 20. Credit: Joel M. Serrano, Virginia Tech Bird-Eating Cyclic Voltammogram Electrochemistry is fun!