Talks

12457 - 12468 of 20120 Results

The impact of the Atmosphere on space-bound Vehicles

August 16, 2013

PIRSA:13080046
Impact cratering and the evolution of planetary surfaces in the solar system – The Chicxulub impact

August 16, 2013

PIRSA:13080041
CAM 2013 - Introduction

August 16, 2013

PIRSA:13080058
13/14 PSI - Student Presentations - 1

August 16, 2013

PIRSA:13080036
13/14 PSI - Algebra - Lecture 2

Anna Kostouki

August 15, 2013

PIRSA:13080010
13/14 PSI- Complex Analysis - Lecture 2

Tibra Ali Perimeter Institute for Theoretical Physics

August 15, 2013

PIRSA:13080007
13/14 PSI - Algebra - Lecture 1

Anna Kostouki

August 14, 2013

PIRSA:13080009
13/14 PSI- Complex Analysis - Lecture 1

Tibra Ali Perimeter Institute for Theoretical Physics

August 14, 2013

PIRSA:13080002
Orbifold partition function and their phases

Daisuke Yokoyama Seoul National University

August 13, 2013

PIRSA:13080044

High Energy Physics
13/14 PSI - Introductions

August 12, 2013

PIRSA:13080045
13/14 PSI - Welcome

August 12, 2013

PIRSA:13080001
Neutron Stars and the Dense Matter Equation of State

Madappa Prakash Ohio University

August 08, 2013

PIRSA:13080000

General Relativity & Quantum Cosmology

The impact of the Atmosphere on space-bound Vehicles

August 16, 2013

PIRSA:13080046

When rockets and space-bound vehicles are fired into space, they have to deal with turbulence, winds and waves in the Earth's atmosphere. Different height regimes cause different problems. In the lower regions (0 to 20 km altitude), winds and turbulence are major issues, whereas above 50 km altitude, large atmospheric waves have serious importance on safe passage. Similar issues arise on re-entry. In this talk, I will discuss the ways in which these atmospheric phenomena manifest themselves, and how they are best mitigated. One example of particular significance will be the Space Shuttle Columbia disaster, for which I consulted with NASA in respect to possible atmospheric influences. I will also describe some of the instrumentation used to measure these phenomena.
Impact cratering and the evolution of planetary surfaces in the solar system – The Chicxulub impact

August 16, 2013

PIRSA:13080041

Impacts of asteroid and comets constitute major geologic processes shaping the surfaces and evolution of planetary bodies. Impacts produce deep transient cavities, with excavation to deep crustal levels, fragmentation, and removal of large rock volumes. Formation of complex craters involves high pressures and temperatures resulting in intense deformation, fracturing and melting. Here, we analyze the crater-forming impacts and their effects on the Earth´s climate, environment and life-support systems, in relation to the Cretaceous/Paleogene (K/Pg) boundary. The boundary represents one of the major extinction events in the Phanerozoic, which affected about 75 % of species. It is marked by a clay layer globally distributed that is characterized by anomalous contents of iridium and platinum group elements, marking the occurrence of a large bolide impact. Studies have examined the age, stratigraphic correlations and composition of the boundary layer, establishing a genetic association to the Chicxulub impact in the Yucatan peninsula in the Gulf of Mexico. The Chicxulub crater is a ~200 km diameter structure with peak ring and multi-ring morphology. Impact generated a transient cavity some 20-25 km deep resulting in intense deformation and shaking, which is recorded in the breccias and debris flow deposits in the Gulf of Mexico and Caribbean Sea area. Impact was on a shallow carbonate platform and resulted in huge tsunamis and in injection of CO2 and sulfur components into the atmosphere. Effects of impacts in the environment and climate of the Earth have been intensely investigated, mainly in relation to the mass extinction, where the affectation in the evolution patterns was profound and long-lasting. Effects of the K/Pg impact on the ecosystems extended for a long period of several millions of years. The disappearance of large numbers of species including complete groups severely affected the biodiversity and ecosystem composition in the marine and continental realms.
CAM 2013 - Introduction

August 16, 2013

PIRSA:13080058
13/14 PSI - Student Presentations - 1

August 16, 2013

PIRSA:13080036
13/14 PSI - Algebra - Lecture 2

Anna Kostouki

August 15, 2013

PIRSA:13080010
13/14 PSI- Complex Analysis - Lecture 2

Tibra Ali Perimeter Institute for Theoretical Physics

August 15, 2013

PIRSA:13080007
13/14 PSI - Algebra - Lecture 1

Anna Kostouki

August 14, 2013

PIRSA:13080009
13/14 PSI- Complex Analysis - Lecture 1

Tibra Ali Perimeter Institute for Theoretical Physics

August 14, 2013

PIRSA:13080002
Orbifold partition function and their phases

Daisuke Yokoyama Seoul National University

August 13, 2013

PIRSA:13080044

High Energy Physics

We discuss a partition function of 3d supersymmetric gauge theories on the (p, -1) Lens space.
In 3d the partition function is directly used to check dualities though the normalization is not seriously treated, especially, the phase is usually ignored. However, when we consider the partition function on the orbifold the partition function consists of the sum of factors labeled by holonomies and their relative phases become crucial. We stress that the known formula for the partition function is incorrect and some relative phase factors are needed to identify the partition functions of dual theories.
13/14 PSI - Introductions

August 12, 2013

PIRSA:13080045
13/14 PSI - Welcome

August 12, 2013

PIRSA:13080001
Neutron Stars and the Dense Matter Equation of State

Madappa Prakash Ohio University

August 08, 2013

PIRSA:13080000

General Relativity & Quantum Cosmology

Implications of recently well-measured neutron star masses, particularly near and above 2 solar masses, for the equation of state (EOS) of neutron star matter will be highlighted. Model independent upper limits to thermodynamic properties in neutron stars, which only depend on the neutron star maximum mass, established from causality considerations will be presented. The need for non-perturbative treatments of quark matter in neutron stars is revealed through studies of self-bound quark matter stars, and of nucleon-quark hybrid stars. The extent to which several well-measured masses and radii of individual neutron stars can establish a model-independent EOS through an inversion of the stellar structure equations will be briefly discussed.

Title	Date	Collection	Type	Info
The impact of the Atmosphere on space-bound Vehicles	2013‑08‑16	CAM 2013 Conference	Conference	View details
Impact cratering and the evolution of planetary surfaces in the solar system – The Chicxulub impact	2013‑08‑16	CAM 2013 Conference	Conference	View details
CAM 2013 - Introduction	2013‑08‑16	CAM 2013 Conference	Conference	View details
13/14 PSI - Student Presentations - 1	2013‑08‑16	13/14 PSI - Front End	Course	View details
13/14 PSI - Algebra - Lecture 2	2013‑08‑15	13/14 PSI - Front End	Course	View details
13/14 PSI- Complex Analysis - Lecture 2	2013‑08‑15	13/14 PSI - Front End	Course	View details
13/14 PSI - Algebra - Lecture 1	2013‑08‑14	13/14 PSI - Front End	Course	View details
13/14 PSI- Complex Analysis - Lecture 1	2013‑08‑14	13/14 PSI - Front End	Course	View details
Orbifold partition function and their phases	2013‑08‑13	Quantum Fields and Strings	Scientific Series	View details
13/14 PSI - Introductions	2013‑08‑12	13/14 PSI - Front End	Course	View details
13/14 PSI - Welcome	2013‑08‑12	13/14 PSI - Front End	Course	View details
Neutron Stars and the Dense Matter Equation of State	2013‑08‑08	Strong Gravity	Scientific Series	View details

Supported by

Format results

The impact of the Atmosphere on space-bound Vehicles

Impact cratering and the evolution of planetary surfaces in the solar system – The Chicxulub impact

CAM 2013 - Introduction

13/14 PSI - Student Presentations - 1

13/14 PSI - Algebra - Lecture 2

13/14 PSI- Complex Analysis - Lecture 2

13/14 PSI - Algebra - Lecture 1

13/14 PSI- Complex Analysis - Lecture 1

Orbifold partition function and their phases

13/14 PSI - Introductions

13/14 PSI - Welcome

Neutron Stars and the Dense Matter Equation of State

The impact of the Atmosphere on space-bound Vehicles

Impact cratering and the evolution of planetary surfaces in the solar system – The Chicxulub impact

CAM 2013 - Introduction

13/14 PSI - Student Presentations - 1

13/14 PSI - Algebra - Lecture 2

13/14 PSI- Complex Analysis - Lecture 2

13/14 PSI - Algebra - Lecture 1

13/14 PSI- Complex Analysis - Lecture 1

Orbifold partition function and their phases

13/14 PSI - Introductions

13/14 PSI - Welcome

Neutron Stars and the Dense Matter Equation of State