Very short summary of the paper "Solving the Structure of Li Ion Battery Materials with Precession
Electron Diffraction: Application to Li2CoPO4F", published in Chem. Mater.
Electron crystallography for lithium based battery materialsJoke Hadermann
This lecture was given at the IUCr (International Union of Crystallography) meeting in Madrid, 2011. Contents are focussed on the use of precession electron diffraction for functional materials, mainly lithium based battery materials, but also a perovskite was included, since a large part of the audience worked on that subject.
Direct space structure solution from precession electron diffraction data: Re...Joke Hadermann
The presentation shows the main points from the publication "Direct space structure solution from precession electron diffraction data: Resolving heavy and light scatterers in Pb13Mn9O25" about how thee structure of Pb13Mn9O25 was solved using transmission electron microscopy.
Determining a structure with electron crystallography - Overview of the paper...Joke Hadermann
The route to a solved structure (in this case Pb13Mn9O25) on the basis of precession electron diffraction, combined with HAADF-STEM, HRTEM, EELS and EDX is shown.
Summary of the paper "Solving the Structure of Li Ion Battery Materials with Precession
Electron Diffraction: Application to Li2CoPO4F"
Scheelite CGEW/MO for luminescence - Summary of the paperJoke Hadermann
This presentation gives very shortly the highlights of our paper.
Incommensurate Modulation and Luminescence in the CaGd2(1-x)Eu2x(MoO4)(4(1-y))(WO4)(4y) (0 <=><=><=><= 1) Red Phosphors
published in Chemistry of Materials, 25, 21 (2013) 4387-4395
by Vladimir Morozov, Anne Bertha, Katrien Meert, Senne Van Rompaey, Dmitry Batuk, Gerardo T. Martinez, Sandra Van Aert, Philippe F. Smet, Maria Raskina, Dirk Poelman, Artem Abakumov, Joke Hadermann
Tem for incommensurately modulated materialsJoke Hadermann
This presentation is a teaching lecture given on the International School on Aperiodic Crystals and explains how to index electron diffraction patterns taken from incommensurately modulated materials, with exercises, and gives some examples of HAADF-STEM and HRTEM images on incommensurately modulated materials.
Electron crystallography for lithium based battery materialsJoke Hadermann
This lecture was given at the IUCr (International Union of Crystallography) meeting in Madrid, 2011. Contents are focussed on the use of precession electron diffraction for functional materials, mainly lithium based battery materials, but also a perovskite was included, since a large part of the audience worked on that subject.
Direct space structure solution from precession electron diffraction data: Re...Joke Hadermann
The presentation shows the main points from the publication "Direct space structure solution from precession electron diffraction data: Resolving heavy and light scatterers in Pb13Mn9O25" about how thee structure of Pb13Mn9O25 was solved using transmission electron microscopy.
Determining a structure with electron crystallography - Overview of the paper...Joke Hadermann
The route to a solved structure (in this case Pb13Mn9O25) on the basis of precession electron diffraction, combined with HAADF-STEM, HRTEM, EELS and EDX is shown.
Summary of the paper "Solving the Structure of Li Ion Battery Materials with Precession
Electron Diffraction: Application to Li2CoPO4F"
Scheelite CGEW/MO for luminescence - Summary of the paperJoke Hadermann
This presentation gives very shortly the highlights of our paper.
Incommensurate Modulation and Luminescence in the CaGd2(1-x)Eu2x(MoO4)(4(1-y))(WO4)(4y) (0 <=><=><=><= 1) Red Phosphors
published in Chemistry of Materials, 25, 21 (2013) 4387-4395
by Vladimir Morozov, Anne Bertha, Katrien Meert, Senne Van Rompaey, Dmitry Batuk, Gerardo T. Martinez, Sandra Van Aert, Philippe F. Smet, Maria Raskina, Dirk Poelman, Artem Abakumov, Joke Hadermann
Tem for incommensurately modulated materialsJoke Hadermann
This presentation is a teaching lecture given on the International School on Aperiodic Crystals and explains how to index electron diffraction patterns taken from incommensurately modulated materials, with exercises, and gives some examples of HAADF-STEM and HRTEM images on incommensurately modulated materials.
We present an ab-initio real-time based computational approach to nonlinear optical properties in Condensed Matter systems. The equation of mot ions, and in particular the coupling of the electrons with the external electric field, are derived from the Berry phase formulation of the dynamical polarization. The zero-field Hamiltonian includes crystal local field effects, the renormalization of the independent particle energy levels by correlation and excitonic effects within the screened Hartree- Fock self-energy operator. The approach is validated by calculating the second-harmonic generation of SiC and AlAs bulk semiconductors : an excellent agreement is obtained with existing ab-initio calculations from response theory in frequency domain . We finally show applications to the second-harmonic generation of CdTe the third-harmonic generation of Si.
Reference :
Real-time approach to the optical properties of solids and nanostructures : Time-dependent Bethe-alpeter equation Phys. Rev. B 84, 245110 (2011)
Nonlinear optics from ab-initio by means of the dynamical Berry-phase
C. Attaccalite and M. Gruning Phys. Rev. B 88 (23), 235113 (2013)
37 Latest results from GRAAL collaboration - Chinese Physics C (HEP & NP), De...Cristian Randieri PhD
Latest results from GRAAL collaboration - Chinese Physics C (HEP & NP), December 2009, Vol. 33, N. 12, pp. 1249-1253, ISSN: 1674-1137, doi: 10.1088/1674-1137/33/12/032
di V. Vegna, V. Bellini, J. P. Bouquet, L. Casano, A. D'Angelo, J. P. Didelez, R. Di Salvo, A. Fantini, D. Franco, G. Gervino, F. Ghio, G. Giardina, B. Girolami, A. Giusa, M. Guidal, E. Hourany, A. S. Ignatov, R. Kunnel, A. Lapik, A. Lleres, P. Levi Sandri, F. Mammoliti, G. Mandaglio, M. Manganaro, M. Moricciani, A.N. Mushkarenkov, V. G. Nedorezov, C. Randieri, D. Rebreyend, N. V. Rudnev, G. Russo, C. Schaerf, M. L. Sperduto, M. C. Sutera, A. Turinge (2009)
Abstract
The GRAAL experimental set-up consists of a polarized and tagged photon beam that covers an energy range from a minimum of 600 MeV up to a maximum of 1500 MeV, of a liquid Hydrogen or Deuterium target and of the 4π Lagrange detector optimized for photon detection. It allows the study of pseudo-scalar and vector meson photoproduction on the nucleon in the energy range corresponding to the second and the third resonance regions. In the following, the σ beam asymmetries in η and π0 photoproduction on quasi-free nucleon are shown. Also single and double polarization observables in K+Λ photoproduction on free proton are shown; they are important to confirm the role of new or poorly known resonances in the 1900 MeV mass region.
Nickel nanoparticle-decorated phosphorous-doped graphitic carbon nitride (Ni@g-PC3N4) was synthesized and used as an efficient photoactive catalyst for the reduction of various nitrobenzenes under visible light irradiation. Hydrazine monohydrate was used as the source of protons and electrons for the intended reaction. The developed photocatalyst was found to be highly active and afforded excellent product yields under mild experimental conditions. In addition, the photocatalyst could easily be recovered and reused for several runs without any detectable leaching during the reaction.
Metal-organic hybrid: Photoreduction of CO2 using graphitic carbon nitride su...Pawan Kumar
A novel heteroleptic iridium complex supported on graphitic carbon nitride was synthesized and used
for photoreduction of carbon dioxide under visible light irradiation. The methanol yield obtained after
24 h irradiation was 9934 mmol g1cat (TON 1241 with respect to Ir) by using triethylamine (TEA) as a
sacrificial donor, which was significantly higher as compared to the semiconductor carbon nitride
145 mmol g1cat under identical conditions. The presence of triethylamine was found to be vital for the
higher methanol yield. After the reaction, the photocatalyst could easily be recovered and reused for subsequent six runs without significant loss in photo activity
Synthesis and spectroscopy of Zinc-ainilido based photocatalyst.Kirti Singh
Synthesis of Zinc complexes and their characterization using crystallography, NMR- spectroscopy, electrochemistry, UV-spectroscopy, fluorescence, IR, HRMS (solid and ESI), study their lifetime using TCSPC, performing stern-volmer quenching experiments and CHN- analysis. ATRA reaction was performed and first order kinetics was found to be rate.
Quantitative electron diffraction tomography for the structure solution of ca...Olesia Karakulina
Here it is shown how the crystal structure of cathode materials can be determined by electron diffraction tomography even after cycling in the electrochemical cell. Moreover, the way to detect and quantify Li is described.
These slides where presented at European Microscopy Congress in Lyon in 2016.
We present an ab-initio real-time based computational approach to nonlinear optical properties in Condensed Matter systems. The equation of mot ions, and in particular the coupling of the electrons with the external electric field, are derived from the Berry phase formulation of the dynamical polarization. The zero-field Hamiltonian includes crystal local field effects, the renormalization of the independent particle energy levels by correlation and excitonic effects within the screened Hartree- Fock self-energy operator. The approach is validated by calculating the second-harmonic generation of SiC and AlAs bulk semiconductors : an excellent agreement is obtained with existing ab-initio calculations from response theory in frequency domain . We finally show applications to the second-harmonic generation of CdTe the third-harmonic generation of Si.
Reference :
Real-time approach to the optical properties of solids and nanostructures : Time-dependent Bethe-alpeter equation Phys. Rev. B 84, 245110 (2011)
Nonlinear optics from ab-initio by means of the dynamical Berry-phase
C. Attaccalite and M. Gruning Phys. Rev. B 88 (23), 235113 (2013)
37 Latest results from GRAAL collaboration - Chinese Physics C (HEP & NP), De...Cristian Randieri PhD
Latest results from GRAAL collaboration - Chinese Physics C (HEP & NP), December 2009, Vol. 33, N. 12, pp. 1249-1253, ISSN: 1674-1137, doi: 10.1088/1674-1137/33/12/032
di V. Vegna, V. Bellini, J. P. Bouquet, L. Casano, A. D'Angelo, J. P. Didelez, R. Di Salvo, A. Fantini, D. Franco, G. Gervino, F. Ghio, G. Giardina, B. Girolami, A. Giusa, M. Guidal, E. Hourany, A. S. Ignatov, R. Kunnel, A. Lapik, A. Lleres, P. Levi Sandri, F. Mammoliti, G. Mandaglio, M. Manganaro, M. Moricciani, A.N. Mushkarenkov, V. G. Nedorezov, C. Randieri, D. Rebreyend, N. V. Rudnev, G. Russo, C. Schaerf, M. L. Sperduto, M. C. Sutera, A. Turinge (2009)
Abstract
The GRAAL experimental set-up consists of a polarized and tagged photon beam that covers an energy range from a minimum of 600 MeV up to a maximum of 1500 MeV, of a liquid Hydrogen or Deuterium target and of the 4π Lagrange detector optimized for photon detection. It allows the study of pseudo-scalar and vector meson photoproduction on the nucleon in the energy range corresponding to the second and the third resonance regions. In the following, the σ beam asymmetries in η and π0 photoproduction on quasi-free nucleon are shown. Also single and double polarization observables in K+Λ photoproduction on free proton are shown; they are important to confirm the role of new or poorly known resonances in the 1900 MeV mass region.
Nickel nanoparticle-decorated phosphorous-doped graphitic carbon nitride (Ni@g-PC3N4) was synthesized and used as an efficient photoactive catalyst for the reduction of various nitrobenzenes under visible light irradiation. Hydrazine monohydrate was used as the source of protons and electrons for the intended reaction. The developed photocatalyst was found to be highly active and afforded excellent product yields under mild experimental conditions. In addition, the photocatalyst could easily be recovered and reused for several runs without any detectable leaching during the reaction.
Metal-organic hybrid: Photoreduction of CO2 using graphitic carbon nitride su...Pawan Kumar
A novel heteroleptic iridium complex supported on graphitic carbon nitride was synthesized and used
for photoreduction of carbon dioxide under visible light irradiation. The methanol yield obtained after
24 h irradiation was 9934 mmol g1cat (TON 1241 with respect to Ir) by using triethylamine (TEA) as a
sacrificial donor, which was significantly higher as compared to the semiconductor carbon nitride
145 mmol g1cat under identical conditions. The presence of triethylamine was found to be vital for the
higher methanol yield. After the reaction, the photocatalyst could easily be recovered and reused for subsequent six runs without significant loss in photo activity
Synthesis and spectroscopy of Zinc-ainilido based photocatalyst.Kirti Singh
Synthesis of Zinc complexes and their characterization using crystallography, NMR- spectroscopy, electrochemistry, UV-spectroscopy, fluorescence, IR, HRMS (solid and ESI), study their lifetime using TCSPC, performing stern-volmer quenching experiments and CHN- analysis. ATRA reaction was performed and first order kinetics was found to be rate.
Synthesis and spectroscopy of Zinc-ainilido based photocatalyst.
Similar to Solving the Structure of Li Ion Battery Materials with Precession Electron Diffraction: Application to Li2CoPO4F - Short summary of the paper
Quantitative electron diffraction tomography for the structure solution of ca...Olesia Karakulina
Here it is shown how the crystal structure of cathode materials can be determined by electron diffraction tomography even after cycling in the electrochemical cell. Moreover, the way to detect and quantify Li is described.
These slides where presented at European Microscopy Congress in Lyon in 2016.
Recent developments for the quantum chemical investigation of molecular syste...Stephan Irle
The structural complexity of molecular clusters increases with size due to the associated, rapidly growing configuration space. Two examples are realized in i) the transition from molecular to bulk systems, and ii) in the subsequent chemical functionalization of nanomaterials. In such systems, traditional quantum chemical approaches of investigations are hampered by the vastly increasing computational cost, even considering ever-growing supercomputer capabilities. Computationally inexpensive, yet accurate schemes such as the density-functional tight-binding (DFTB) method promise here a significant advantage.
We have recently engaged in developing novel methodologies for systems with increasing structural complexity, driven by motivation from experimental studies. In this presentation, we will briefly review a) our advances in the automatic parameterization of DFTB, and b) the Kick-fragment-based “CrazyLego” conformationally aware approach for studying molecular and ionic liquid clusters with increasing size.
Quantum chemical molecular dynamics simulations of graphene hydrogenationStephan Irle
Chemical adsorption of hydrogen atoms on graphite
surfaces has attracted considerable interest due to its
relevance for a broad range of areas including
plasma/fusion physics, gap tuning in graphene, and hydrogen storage. We adjusted the C-H repulsive potential of the spin-polarized self-consistent-charge density-functional tight-binding (sSCC-DFTB) method to reproduce
CCSD(T)-based relaxed potential energy curves for the
attack of atomic hydrogen on a center carbon atom of
pyrene and coronene at a tiny fraction of the computational
cost. Using this cheap quantum chemical potential, we performed direct on-the-fly Born-Oppenheimer
MD simulations while “shooting” H atoms with varying collision energies on a periodic graphene target
equilibrated at 300 Kelvin. We compared reaction cross sections for a) elastic collisions, b)
chemisorption reactions, c) penetration reactions in dependence of H/D/T kinetic energies, and found
remarkable differences to previously reported classical MD simulations of the same process. Using the
same potential, in simulations involving the shooting of up to 400 hydrogen atoms on the graphene sheet,
we observed the self-assembly of C4H, a novel polymer with localized aromatic hexagons, in agreement
with recent experimental findings.
• Background and motivation – the success of pheophytin (pheo, 脫鎂葉綠素) catalyst
• Porphyrin-ring family and roles of their derivative morphologies
• Similar derivatives within DNA base pairs
• 1st-principle simulation of simplified H2 decomposition steps involving derivative DNA base pairs à energetically favorable?
• Wet DNA-catalyzed chemical battery experiment and result
• Dry DNA-catalyzed hydrogen fuel cell under room temperature
• Summary and conclusions
UCSD NANO 266 Quantum Mechanical Modelling of Materials and Nanostructures is a graduate class that provides students with a highly practical introduction to the application of first principles quantum mechanical simulations to model, understand and predict the properties of materials and nano-structures. The syllabus includes: a brief introduction to quantum mechanics and the Hartree-Fock and density functional theory (DFT) formulations; practical simulation considerations such as convergence, selection of the appropriate functional and parameters; interpretation of the results from simulations, including the limits of accuracy of each method. Several lab sessions provide students with hands-on experience in the conduct of simulations. A key aspect of the course is in the use of programming to facilitate calculations and analysis.
This article gives a vivid description of the principle and working procedure of a Light Emitting Diode. It provides a comprehensive understanding of how this very important optical device is useful in our daily applications, its types, structure and other related information.
Resonant Rayleigh Scattering from Collective Molecular ExcitationsbalasubrahmaniyamM
Resonant Rayleigh scattering (RRS) is the pronounced elastic scattering of photons present at the vicinity of the natural resonances of sub-wavelength physical objects such as molecules, which otherwise scatter negligibly. Here, we study RRS from molecular ensembles strongly coupled to an optical microcavity. Under these conditions, the coherent interaction between the molecules and the cavity mode produces collective molecular states known as cavity polaritons and which can drastically modify the properties these molecules. Our spectroscopic measurements reveal that strong RRS occurs at the polaritonic energies, reaching ~25% efficiency. Interestingly, this resonant scattering corresponds to the collective scattering of each photon from a macroscopically-large ensemble of molecules, rather than the scattering by individual ones, as in the usual case. We show that the scattering from the polaritonic states exhibit non trivial behaviors, specifically a linear dependence of the scattering strength on their photonic component. We believe that these observations, together with further investigation, may lead to a deeper understanding of these delocalized, collective molecular excitations, their non-equilibrium transport and the role of disorder in their dynamics.
The main objective of my PhD research at CEA Grenoble (M. Mazzanti, R. Demadrille) was related to a better understanding of the structure-property relationship in emissive lanthanide complexes with potential applications in opto-electronic devices. This was achieved by a careful design of lanthanide antennas based on either organic chromophores or transition metals as ligands, followed by a study of the structural and photophysical properties of the resulting complexes, in order to estimate and further predict the sensitization efficiencies.
In a first line of research, we have described and patented the incorporation of tetrazole groups as carboxylic acid replacements for the sensitization of lanthanide emission. We were able to show how the variation of ligand substituents influences the photophysical properties, allowing us to draw predictions and to adapt the structures for improving the emission efficiency. Some of the compounds have been successfully tested in OLED devices.
We also became interested in designing and studying new types of polymetallic architectures based on iridium complexes for the sensitization of lanthanide emission, as well as preliminary investigating the grafting of lanthanide complexes on silicon surfaces.
Similar to Solving the Structure of Li Ion Battery Materials with Precession Electron Diffraction: Application to Li2CoPO4F - Short summary of the paper (20)
5 10c exercise_index the aluminum tilt series_ex on saed do not know cell parsJoke Hadermann
This is a tutorial on how to index single crystal (electron) diffraction patterns when the cell parameters are not yet known. This follows after another tutorial for the case of known cell parameters, 5.10a.
5 10b exercise_determine the diffraction symbol of ca_f2_ex on saedJoke Hadermann
These slides follow up on the slides with a tutorial on how to index ED patterns, 5 10a. From the result achieved in those slides, we now derive the reflection conditions and corresponding possible space groups.
Complementarity of advanced TEM to bulk diffraction techniquesJoke Hadermann
Lecture contains some examples of how advanced TEM techniques can help solve the structure if for some reason bulk diffraction techniques do not allow to propose a model.
Mapping of chemical order in inorganic compoundsJoke Hadermann
Presentations of some of the possibilities of observing cation and anion order in perosvkite based structures in order to solve their structure or to solve other questions, when they could not be solved by bulk diffraction techniques. The examples include a (Pb,Bi)FeO3-d compound, a solid oxide fuel cell compound Sr(Nb,Co,Fe)O3-d and several brownmillerite related compounds, as well as a "relaxor ferromagnetic". This was an invited lecture given at the Spring meeting of the British Crystallographic Association in 2014.
New oxide structures using lone pairs cations as "chemical scissors"Joke Hadermann
New oxide structure types were created by using lone pair cations as "chemical scissors" to cut perovskite blocks in novel ways. The compounds show magnetic frustration.
This is a tutorial on indexing diffraction patterns, deriving reflection conditions from SAED, derving point groups from CBED and combining both to find the space group. The slides contain exercises, the page to work on is at the end of the presentation and should be printed first to be able to measure on that page.
This lecture was given at the 2nd International School on Aperiodic Crystals in Bayreuth, Germany. It is an updated version of the lecture given on the 1st school, that can be found between my lectures as "TEM for incommensurately modulated materials".
Modulated materials with electron diffractionJoke Hadermann
This lecture was given at the International School of Crystallography in Erice 2011, on the topic of Electron Crystallography. It explains the very basics of how to index commensurately and incommensurately modulated materials. It was meant for a 40 minute lecture.
TEM Winterworkshop 2011: electron diffractionJoke Hadermann
Tutorial on how to index diffraction patterns, determine extinction symbols from SAED and point groups from CBED. Lesson taught at the EMAT Winterworkshop on TEM. 21 januari 2011
Executive Directors Chat Leveraging AI for Diversity, Equity, and InclusionTechSoup
Let’s explore the intersection of technology and equity in the final session of our DEI series. Discover how AI tools, like ChatGPT, can be used to support and enhance your nonprofit's DEI initiatives. Participants will gain insights into practical AI applications and get tips for leveraging technology to advance their DEI goals.
Normal Labour/ Stages of Labour/ Mechanism of LabourWasim Ak
Normal labor is also termed spontaneous labor, defined as the natural physiological process through which the fetus, placenta, and membranes are expelled from the uterus through the birth canal at term (37 to 42 weeks
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Solving the Structure of Li Ion Battery Materials with Precession Electron Diffraction: Application to Li2CoPO4F - Short summary of the paper
1.
2. The problem:
Structure of Li2CoPO4F cannot be solved or
refined from bulk diffraction.
The solution:
Precession electron diffraction càn get the
job done.
This presentation describes the procedure
in the shortest way possible.
3. For a more detailed treatment:
“Solving the Structure of Li Ion Battery Materials with
Precession Electron Diffraction: Application to Li 2CoPO4F”
in Chemistry of Materials
by Joke Hadermann, Artem M. Abakumov, Stuart Turner,
Zainab Hafideddine, Nellie R. Khasanova, Evgeny V. Antipov
and Gustaaf Van Tendeloo
Published online July 11, 2011
http://pubs.acs.org/doi/abs/10.1021/cm201257b
4. First, electron
diffraction patterns are
taken, using the
precession attachment.
Non main zones have
more reliable peak
intensities than main
zones.
5. All patterns can be indexed using the cell
parameters and space groups known from XRD:
a= 10.452(2) Å, b= 6.3911(8) Å, c=10.874(2) Å
Pnma
6. The intensities of the observed peaks are extracted
(ELD software).
Treated: symmetry equivalent reflections merged,
geometric corrections applied
Merged into one list (Triple software)
We now have intensities of
237 symmetry unique reflections
7. a= 10.452(2) Å,
Intensities of 237
b= 6.3911(8) Å, & symmetry unique
c=10.874(2) Å
reflections
Pnma
INTO
Direct Methods
8. Result: R=31%
CO and P positions similar to Li2FePO4F
but
Li, O, F mixed over remaining positions
Assign
F: tetrahedra around P
O: complete the octahedra around Co
Remaining positions (purple) Li or ghosts?
Difference Fourier maps including Co,P,O,F
9. The difference Fourier maps
clearly show the real peaks
The Li-atoms are now also located
10. Straight from direct methods:
too many Li(?) peaks
Difference Fourier allows
to eliminate the grey ones
Structure is solved !
12. Separate list of intensities per zone were
put into Jana using separate scale factors
for each list on input
&
Use PO4 rigid units:
18 variables reduced to 6
R=24% (reasonable for precession
electron diffraction data)
13.
14. Conclusion
Li2CoPO4F was successfully solved and
refined from precession electron
diffraction
PED can be successfully applied
for the crystallographic characterization
of Li-based battery materials