Brighton Astro - Neutron Star PresentationGareth Jenkins
Presentation from 28th March 2017 to Brighton Astro group. Slideshare removes embedded videos, so two in here are the following:
https://www.youtube.com/watch?v=e-P5IFTqB98&t=18s
https://www.youtube.com/watch?v=NhOVDDiSvMM
Červenec: Žijte jako v ráji, Jak si zvolit správného partnera, Soudit je jed, Červenec - vládne mezidobí Země, bydlení: Hojnost v interiéru, Je čas vrátit moudrost do života, byznys: Červenec - období konsolidace, Energie dní: týden od 4.7.
Brighton Astro - Neutron Star PresentationGareth Jenkins
Presentation from 28th March 2017 to Brighton Astro group. Slideshare removes embedded videos, so two in here are the following:
https://www.youtube.com/watch?v=e-P5IFTqB98&t=18s
https://www.youtube.com/watch?v=NhOVDDiSvMM
Červenec: Žijte jako v ráji, Jak si zvolit správného partnera, Soudit je jed, Červenec - vládne mezidobí Země, bydlení: Hojnost v interiéru, Je čas vrátit moudrost do života, byznys: Červenec - období konsolidace, Energie dní: týden od 4.7.
Dalam konteks Tri Dharma Perguruan Tinggi seringkali Pengabdian Masyarakat agak terpinggirkan dalam praktiknya. Uraian ini mencoba mengetengahkan bahwa justru Pengabdian Masyarakat harus dijadikan kekuatan utama akademisi untuk meningkatkan kehidupan bersama yang lebih berkualitas.
Strategic Analysyis Of Alternatives For Waste Management In Valle De Aburrá 2008Enrique Posada
Strategical analysis is proposed as a tool for correct solid waste handling planning in a large city, such as Medellín. Four alternatives are compared and the ones favoring recycling and education are shown to be more beneficial, even from the economical point of view
Materi ini mencoba menjabarkan hal-hal yang mendasari munculnya perilaku menolong. Selain itu ada pula penjelasan hal-hal apa saja yang akan meningkatkan atau malah mengurangi munculnya perilaku menolong. Terakhir, ada satu pertanyaan menggelitik yang coba dilempar, apakah benar perilaku menolong berada di titik yang berseberangan dengan perilaku agresif.
Listopad - vládne nám Vepř, Proč je Feng Shui nebezpečné?, Prostředí ovlivňuje vývoj lidstva, bydlení: Ráno tvoří celý váš den, Tao = fáze dokončení, Energie dní na týden od 7.11. 2016
Simple determination of Physical and Thermal Properties as a basis for the De...Enrique Posada
Conference presented at 35th International Conference on Thermal Treatment Technologies & Hazardous Waste Combustors (IT3/HWC), October 4-6, 2016, Baton Rouge, LA
TCI Webinar: Construcción de la estrategia de una iniciativa cluster - Catalu...TCI Network
Webinar TCI América Latina, 24 de noviembre de 2016. Moderado por Patricia Valdenebro, CEO TCI Network. Expertos invitados Joan Martí, Cataluña y Cecilia Carrillo, México.
This lecture provides a general feedback to the concept of error analysis and the stages of conducting error analysis, and the sources of errors. ..etc.
Dalam konteks Tri Dharma Perguruan Tinggi seringkali Pengabdian Masyarakat agak terpinggirkan dalam praktiknya. Uraian ini mencoba mengetengahkan bahwa justru Pengabdian Masyarakat harus dijadikan kekuatan utama akademisi untuk meningkatkan kehidupan bersama yang lebih berkualitas.
Strategic Analysyis Of Alternatives For Waste Management In Valle De Aburrá 2008Enrique Posada
Strategical analysis is proposed as a tool for correct solid waste handling planning in a large city, such as Medellín. Four alternatives are compared and the ones favoring recycling and education are shown to be more beneficial, even from the economical point of view
Materi ini mencoba menjabarkan hal-hal yang mendasari munculnya perilaku menolong. Selain itu ada pula penjelasan hal-hal apa saja yang akan meningkatkan atau malah mengurangi munculnya perilaku menolong. Terakhir, ada satu pertanyaan menggelitik yang coba dilempar, apakah benar perilaku menolong berada di titik yang berseberangan dengan perilaku agresif.
Listopad - vládne nám Vepř, Proč je Feng Shui nebezpečné?, Prostředí ovlivňuje vývoj lidstva, bydlení: Ráno tvoří celý váš den, Tao = fáze dokončení, Energie dní na týden od 7.11. 2016
Simple determination of Physical and Thermal Properties as a basis for the De...Enrique Posada
Conference presented at 35th International Conference on Thermal Treatment Technologies & Hazardous Waste Combustors (IT3/HWC), October 4-6, 2016, Baton Rouge, LA
TCI Webinar: Construcción de la estrategia de una iniciativa cluster - Catalu...TCI Network
Webinar TCI América Latina, 24 de noviembre de 2016. Moderado por Patricia Valdenebro, CEO TCI Network. Expertos invitados Joan Martí, Cataluña y Cecilia Carrillo, México.
This lecture provides a general feedback to the concept of error analysis and the stages of conducting error analysis, and the sources of errors. ..etc.
The Schwadron IBEX Ribbon Retention Theory and its possible Impact on Astrono...Peter Palme 高 彼特
Ribbon in Space around our Solar Syxstem discovered by IBEX – NASA
Will it have an impact on the current solar system and planet formation theory ?
Further:
Researchers from the University of Michigan announced today the discovery of tiny amounts of water in the moon rocks brought back to Earth by the Apollo missions were native water, and not water brought by meteors or other objects from space crashing into it. This discovery could in turn invalidate the current theory of how our Moon was formed
Youxue Zhang -
Peter Higgs - Higgs Boson - vacuum instability -
cylcle Universe formation - Galaxy formation
Joseph Lykken, a theoretical physicist at the Fermi National Accelerator Laboratory in Batavia, Ill., said Monday (Feb. 18) at the annual meeting of the American Association for the Advancement of Science
A YOUNG PROTOPLANET CANDIDATE EMBEDDED IN THE CIRCUMSTELLAR DISK
Sascha P. Quanz1,2, Adam Amara2, Michael R. Meyer2, Matthew A. Kenworthy3, Markus Kasper4, and Julien H. Girard are currently observing a formation of a protoplanet
Hector Acre Yale University Herbig-Haro 46/47 ALMA Astrophysical Journal
NASA Van Allen Probes
Geoff Reeves
Andrew Hodges, mathematical physicist at Oxford University
Jacob Bourjaily, theoretical physicist at Harvard University
quantum field theory
Nima Arkani-Hamed, lead author, professor of physics at the Institute for Advanced Study in Princeton, N.J.
Amplituhedron
David Skinner, theoretical physicist at Cambridge University
Parke and Taylor guessed a simple one-term expression
BCFW recursion relations, named for Ruth Britto, Freddy Cachazo, Bo Feng and Edward Witten.
leading mathematicians such as Pierre Deligne, Arkani-Hamed and his collaborators discovered that the recursion relations and associated twistor diagrams corresponded to a well-known geometric object. In fact, as detailed in a paper posted to arXiv.org in December by Arkani-Hamed, Bourjaily, Cachazo, Alexander Goncharov, Alexander Postnikov and Jaroslav Trnka, the twistor diagrams gave instructions for calculating the volume of pieces of this object, called the positive Grassmannian.
Hermann Grassmann, a 19th-century German linguist and mathematici
Arkani-Hamed and Trnka discovered that the scattering amplitude equals the volume of a brand-new mathematical object — the amplituhedron
Neal Turner and colleagues at NASA's Jet Propulsion Laboratory developped a three dimensional model where magnetism plays a key role in planet formation.
Laura Mersini-Houghton has so far the best theory to answer for the formation of galaxies. The Theory of the Landscape Multiverse The theory and its predictions are derived from fundamental physics and first principles by using quantum cosmology for the wavefunction of the universe on the landscape and calculating decoherence and quantum entanglement among various surviving branches
Chariklo Felipe Braga-Ribas National Observatory in Brazil
This is a very broad overview of cosmology. It includes an introduction to galaxies, the large scale structure of the universe, black holes, and the fate of the universe. It is intended for teenagers and up.
Introduction:
RNA interference (RNAi) or Post-Transcriptional Gene Silencing (PTGS) is an important biological process for modulating eukaryotic gene expression.
It is highly conserved process of posttranscriptional gene silencing by which double stranded RNA (dsRNA) causes sequence-specific degradation of mRNA sequences.
dsRNA-induced gene silencing (RNAi) is reported in a wide range of eukaryotes ranging from worms, insects, mammals and plants.
This process mediates resistance to both endogenous parasitic and exogenous pathogenic nucleic acids, and regulates the expression of protein-coding genes.
What are small ncRNAs?
micro RNA (miRNA)
short interfering RNA (siRNA)
Properties of small non-coding RNA:
Involved in silencing mRNA transcripts.
Called “small” because they are usually only about 21-24 nucleotides long.
Synthesized by first cutting up longer precursor sequences (like the 61nt one that Lee discovered).
Silence an mRNA by base pairing with some sequence on the mRNA.
Discovery of siRNA?
The first small RNA:
In 1993 Rosalind Lee (Victor Ambros lab) was studying a non- coding gene in C. elegans, lin-4, that was involved in silencing of another gene, lin-14, at the appropriate time in the
development of the worm C. elegans.
Two small transcripts of lin-4 (22nt and 61nt) were found to be complementary to a sequence in the 3' UTR of lin-14.
Because lin-4 encoded no protein, she deduced that it must be these transcripts that are causing the silencing by RNA-RNA interactions.
Types of RNAi ( non coding RNA)
MiRNA
Length (23-25 nt)
Trans acting
Binds with target MRNA in mismatch
Translation inhibition
Si RNA
Length 21 nt.
Cis acting
Bind with target Mrna in perfect complementary sequence
Piwi-RNA
Length ; 25 to 36 nt.
Expressed in Germ Cells
Regulates trnasposomes activity
MECHANISM OF RNAI:
First the double-stranded RNA teams up with a protein complex named Dicer, which cuts the long RNA into short pieces.
Then another protein complex called RISC (RNA-induced silencing complex) discards one of the two RNA strands.
The RISC-docked, single-stranded RNA then pairs with the homologous mRNA and destroys it.
THE RISC COMPLEX:
RISC is large(>500kD) RNA multi- protein Binding complex which triggers MRNA degradation in response to MRNA
Unwinding of double stranded Si RNA by ATP independent Helicase
Active component of RISC is Ago proteins( ENDONUCLEASE) which cleave target MRNA.
DICER: endonuclease (RNase Family III)
Argonaute: Central Component of the RNA-Induced Silencing Complex (RISC)
One strand of the dsRNA produced by Dicer is retained in the RISC complex in association with Argonaute
ARGONAUTE PROTEIN :
1.PAZ(PIWI/Argonaute/ Zwille)- Recognition of target MRNA
2.PIWI (p-element induced wimpy Testis)- breaks Phosphodiester bond of mRNA.)RNAse H activity.
MiRNA:
The Double-stranded RNAs are naturally produced in eukaryotic cells during development, and they have a key role in regulating gene expression .
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
This presentation explores a brief idea about the structural and functional attributes of nucleotides, the structure and function of genetic materials along with the impact of UV rays and pH upon them.
A brief information about the SCOP protein database used in bioinformatics.
The Structural Classification of Proteins (SCOP) database is a comprehensive and authoritative resource for the structural and evolutionary relationships of proteins. It provides a detailed and curated classification of protein structures, grouping them into families, superfamilies, and folds based on their structural and sequence similarities.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
Mammalian Pineal Body Structure and Also Functions
Type ia supernovae
1. Type Ia Supernovae
A chronological attempt at
determining their progenitor
http://universeadventure.org/fundamentals/images/light-tycho.png
2. Layout
• Introduction:
– What are type Ia supernovae (SNe Ia)?
– Why are they important?
– What is needed?
• Necessary Components:
– Chandrasekhar’s mass limit
– Classical novae
– Recurrent novae
– Super soft X-ray sources
– Single and double degenerate scenarios
– Binary systems
• Trip Through Time (1980’s to current day):
– Lets find out what we know
• Summary:
3. Introduction
What are type Ia supernovae (SNe Ia)?
• They originate from white dwarfs (WDs)
• A super explosion releasing around 1-2 x1044 Joules
• Occurs when the WD reaches the Chandrasekhar mass limit ~1.44 M⊙
• No hydrogen seen in their light spectra
Why are they important?
• Used as standard candles for distance measurements
• Responsible for most of the iron abundance in the
universe
What is needed?
• A long period of stable accretion onto the WD, so it can grow
https://www.llnl.gov/str/SepOct08/hoffman.html
4. Necessary Components (1)
Chandrasekhar’s mass limit ~1.44 M⊙:
• Is the maximum mass a white dwarf can have before collapsing
• SNe Ia explodes due to a runaway carbon reaction in the core
Classical and recurrent novae:
• These are caused by thermonuclear runaway reactions on the surface after excessive
hydrogen compression
• Classical novae have been ruled out, due to more mass been removed than accreted
• Recurrent novae lose less mass than it had accreted
Super soft X-ray sources:
• These are very hot (>50 T ⊙) and luminous (>5000 L ⊙) WDs
• Hydrogen burns into helium on the surface immediately leading to no novae
explosions.
http://arxiv.org/pdf/0911.5254v3.pdf
Novae evolution
5. Necessary Components (2)
Single degenerate scenario (SDS):
• The WD accretes matter from a sub-giant,
main sequence, red giant star or AGB star
Double degenerate scenario (DDS):
• The WD accretes matter from another
WD before colliding
Cataclysmic Variable (CV) [Any star]:
1. Roche lobe is filled, accretion occurs through
the Lagrangian point
Symbiotic Variable (SB) [RG or AGB only]:
1. Roche lobe isn’t filled, accretion occurs only via
strong winds
http://www.daviddarling.info/images/contact_binary.jpg
http://astronomy.swin.edu.au/cms/cpg15x/albums/userpics/typeiaprogenitor1.jpg
10. Summary
In a sentence:
We still have no idea what the progenitor is!
• SSS WDs were favoured up until the beginning of
the century but have now been ruled out
• Recurrent novae are strong contenders, though confusion over
observations of T-Pyx might be an issue
• The double degenerate scenario started off weak pre 2005 but since
then they have become strong contenders due to the effects of
rotation
• Final word:
If we say the progenitor is a combination of both the SDS and
DDS, it would lead to SNe Ia being poor “Standard Candles”!
