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## Tintype of Man with Derby Hat leaning against Chair [n.d.]

Fonte: Brock University
Publicador: Brock University

Tipo: Artigo de Revista Científica

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An unidentified young Black gentleman poses beside a chair in this small tintype photograph. Both the name of the photographer and the date the photo was taken are unknown. The upper and lower left-hand corners have been cut and the tintype is slightly discolored and bent. This tintype was among the family memorabilia in the possession of Iris Sloman Bell, of St. Catharines, Ontario. The Bell - Sloman families are descended from former slaves from the United States."Tintypes were the invention of Prof. Hamilton Smith of Ohio. They begin as thin sheets of iron, covered with a layer of black paint. This serves as the base for the same iodized collodion coating and silver nitrate bath used in the ambrotype process. First made in 1856, millions were produced well into the twentieth century. When tintypes were finished in the same sorts of mats and cases used for ambrotypes, it can be almost impossible to distinguish which process was used without removing the image to examine the substrate."
Source: American Museum of Photography
http://www.photographymuseum.com/primer.html

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## A woman wearing a black mourning dress in Moore Town, Portland, Jamaica; The Bryant Slides Collection; The Bryant Slides Collection, Jamaica

Fonte: Universidade da Flórida
Publicador: Universidade da Flórida

Tipo: still image
Formato: 35 mm

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#Moore Town (Jamaica) -- Social life and customs#Women, Black -- Clothing -- Jamaica -- Moore Town -- 1970-1980#Maroons -- Jamaica -- Moore Town -- 1970-1980#Huts -- Jamaica -- Moore Town -- 1970-1980#Mourning customs -- Jamaica -- Moore Town -- 1970-1980

The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.; In this picture, an older woman is wearing a black dress and hat as a sign of mourning. In the background is a wooden hut. Inhabitants of Moore Town, Portland, Jamaica are descendants of Maroons, escaped slaves who were able to maintain some aspects of their African cultures. Slide labeled Jam. Moore Town in mourning.

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## The Black Arts Movement and its Influence on Contemporary Visual Art, Music, and Literature

Fonte: Universidade de Tubinga
Publicador: Universidade de Tubinga

Tipo: ResearchPaper

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Erörterung der Einflüsse die das Black Arts Movement in den Bereichen Musik, Literatur und visueller Kunst hatte und immer noch hat.; Explanation of the influences the Black Arts Movement had and still has in the fields of music, literature, and visual art.

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## Hochauflösende Untersuchungen von Biomarkern an epikontinentalen Schwarzschiefern des Unteren Toarciums (Posidonienschiefer, Lias e) von SW-Deutschland; High-resolution biomarker investigations of Lower Toarcian epicontinental black shales (Posidonia Shale, SW-Germany)

Fonte: Universidade de Tubinga
Publicador: Universidade de Tubinga

Tipo: Dissertação

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#Biomarker , Posidonienschiefer , Schwarzschiefer , Jura , organische Geochemie#550#Methanoxidation , Schwefelbakterien , Archaebakterien , Paläoklima , stabile Isotope#Biomarkers , Posidonia Shale , black shales , methane oxidation , photic zone anoxia

Die detaillierte Beprobung eines Komposit-Profils des Posidonienschiefers (Unteres Toarcium) aus dem Raum Dotternhausen (SW-Deutschland) hat einen hochauflösenden organisch-geochemischen Datensatz geliefert. Im Vordergrund der Untersuchungen stand die genaue Charakterisierung und Beschreibung der Zusammensetzung des organischen Materials anhand von Biomarkern und stabilen Isotopen. Ziel dieser Arbeit war es, die Kopplung klimatischer und ozeanographischer Faktoren mit der Sauerstoffverfügbarkeit und damit die Lebensbedingungen am Meeresboden und in der nahen Wassersäule der epikontinentalen Schwarzschiefer zu rekonstruieren. Die sequenzstratigraphische Entwicklung des Meeresspiegels im Posidonienschiefer von SW-Deutschland, die sich anhand des C27/C29-Steran-Verhältnisses sowie durch sedimentologische und palökologische Beobachtungen ableiten lässt, steht im engen Zusammenhang mit den Veränderungen der Sauerstoffverfügbarkeit im Posidonienschiefer-Meer. Verschiedene Redox- und Alkalinitätsparameter folgen dem Verlauf der Meeresspiegelkurve 3. Ordnung und lassen sich gut mit den untergeordneten Zyklen 4. Ordnung korrelieren. Erstmals konnten neben sulfatreduzierenden Bakterien durch langkettige Isoprenoide auch methanogene Archaebakterien im Posidonienschiefer von SW-Deutschland identifiziert werden. Das Zusammenwirken methanoxidierender und sulfatreduzierender Bakterien im Bereich der anaeroben Methanoxidations-Zone führte zu einer Zunahme der Alkalinität im Porenwasser...

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## Chris Eagle: Ripples in the Gene Pool - Creating Genetic: Mutations to Survive the Vulnerability Window [video]

Fonte: Escola de Pós-Graduação Naval
Publicador: Escola de Pós-Graduação Naval

Tipo: Vídeo

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#Computers/Hacking#DC 14#Defcon14#Education#Software How-To#Technology#Training#computer security#convention#dc-14#def con

Reverse engineers often like to argue that a prime motivator for their activities is the desire to discover and patch vulnerabilities in closed-source binary software. Given the veritable plethora.. nay, Katrina-like flood of vulnerabilities being discovered on a near daily basis, one has to wonder where all these binary patches are hiding. Clearly this argument is a sham to make reverse engineers feel better about their DMCA violating activities. Now, just to be clear, there have been one or two third party binary patches released in the past year, but why haven't there been more? Is it truly a difficult task to develop such a patch or are our sights simply set too high? Is a true fix to the problem a requirement or is it sufficient to modify the vulnerable program just enough to make it immune to scripted attacks, the goal being to provide sufficient protection to survive until a vendor supplied patch can truly fix the problem. Dan Geer argued that a software monoculture is a dangerous thing leading to the rapid spread of malicious code in the event of a public vulnerability disclosure. The goal of this talk is to discuss simple yet effective measures to introduce sufficient genetic diversity into an inbred piece of software to allow it to survive in the wild until a vendor supplied update becomes available. Bio: Chris Eagle is a Defcon Black Badge holder...

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## A woman wearing black in Moore Town, Portland, Jamaica; The Bryant Slides Collection; The Bryant Slides Collection, Jamaica

Fonte: Universidade da Flórida
Publicador: Universidade da Flórida

Tipo: still image
Formato: 35 mm

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#Moore Town (Jamaica) -- Social life and customs#Women, Black -- Clothing -- Jamaica -- Moore Town -- 1970-1980#Maroons -- Jamaica -- Moore Town -- 1970-1980#Dwellings -- Jamaica -- Moore Town -- 1970-1980#Mourning customs -- Jamaica -- Moore Town -- 1970-1980

The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.; This older woman, pictured, is wearing a black dress and hat. In the background is a wooden house with a zinc roof. On the house's verandah are tables and chairs with pots and a cup. Inhabitants of Moore Town, Portland, Jamaica are descendants of Maroons, escaped slaves who were able to maintain some aspects of their African cultures. Slide labeled Jam. Moore Town.

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## Black Hole in Thermal Equilibrium with a Spin-2 Quantum Field

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 29/01/1996
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An approximate form for the vacuum averaged stress-energy tensor of a
conformal spin-2 quantum field on a black hole background is employed as a
source term in the semiclassical Einstein equations. Analytic corrections to
the Schwarzschild metric are obtained to first order in $\epsilon =
{\hbar}/M^2$, where $M$ denotes the mass of the black hole. The approximate
tensor possesses the exact trace anomaly and the proper asymptotic behavior at
spatial infinity, is conserved with respect to the background metric and is
uniquely defined up to a free parameter $\hat c_2$, which relates to the
average quantum fluctuation of the field at the horizon. We are able to
determine and calculate an explicit upper bound on $\hat c_2$ by requiring that
the entropy due to the back-reaction be a positive increasing function in $r$.
A lower bound for $\hat c_2$ can be established by requiring that the metric
perturbations be uniformly small throughout the region $2M \leq r < r_o$, where
$r_o$ is the radius of perturbative validity of the modified metric. Additional
insight into the nature of the perturbed spacetime outside the black hole is
provided by studying the effective potential for test particles in the vicinity
of the horizon.; Comment: 21 pages in plain LaTex. Three figures available upon request from
the first author

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## The Dirac Equation in Kerr-Newman-AdS Black Hole Background

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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We consider the Dirac equation on the Kerr-Newman-AdS black hole background.
We first perform the variable separation for the Dirac equation and define the
Hamiltonian operator $\hat H$. Then we show that for a massive Dirac field with
mass $\mu\geq \frac{1}{2l}$ essential selfadjointness of $\hat H$ on
$C_0^{\infty} ((r_+,\infty) \times S^2)^4$ is obtained even in presence of the
boundary-like behavior of infinity in an asymptotically AdS black hole
background. Furthermore qualitative spectral properties of the Hamiltonian are
taken into account and in agreement with the existing results concerning the
case of stationary axi-symmetric asymptotically flat black holes we infer the
absence of time-periodic and normalizable solutions of the Dirac equation
around the black hole in the non-extremal case.; Comment: 27 pages, AMS style. Some misprints corrected. Improvements in
sections 1,5 and 6 and in Appendix A (improved discussion of the Dirac
quantization condition). References added

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## Nonlinear $\hat{W}_{\infty}$ Current Algebra in the SL(2,R)/U(1) Coset Model

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 04/12/1991
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Previously we have established that the second Hamiltonian structure of the
KP hierarchy is a nonlinear deformation, called $\hat{W}_{\infty}$, of the
linear, centerless $W_{\infty}$ algebra. In this letter we present a free-field
realization for all generators of $\hat{W}_{\infty}$ in terms of two scalars as
well as an elegant generating function for the $\hat{W}_{\infty}$ currents in
the classical conformal $SL(2,R)/U(1)$ coset model. After quantization, a
quantum deformation of $\hat{W}_{\infty}$ appears as the hidden current algebra
in this model. The $\hat{W}_{\infty}$ current algebra results in an infinite
set of commuting conserved charges, which might give rise to $W$-hair for the
2d black hole arising in the corresponding string theory at level $k=9/4$.; Comment: 11p

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## Where angular momentum goes in a precessing black hole binary

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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#General Relativity and Quantum Cosmology#Astrophysics - Cosmology and Nongalactic Astrophysics#Astrophysics - Astrophysics of Galaxies#Astrophysics - High Energy Astrophysical Phenomena

We evolve a set of 32 equal-mass black-hole binaries with collinear spins
(with intrinsic spin magnitudes $|\vec{S}_{1,2}/m^2_{1,2}|=0.8$) to study the
effects of precession in the highly nonlinear plunge and merger regimes. We
compare the direction of the instantaneous radiated angular momentum,
$\hat{\delta J}_{\rm rad}(t)$, to the directions of the total angular momentum,
$\hat{J}(t)$, and the orbital angular momentum, $\hat{L}(t)$. We find that
$\hat{\delta J}_{\rm rad}(t)$ approximately follows $\hat{L}$ throughout the
evolution. During the orbital evolution and merger, we observe that the angle
between $\vec{L}$ and total spin $\vec{S}$ is approximately conserved to within
$1^\circ$, which allows us to propose and test models for the merger remnant's
mass and spin. For instance, we verify that the \hangup effect is the dominant
effect and largely explains the observed total energy and angular momentum
radiated by these precessing systems. We also verify that the total angular
momentum, which significantly decreases in magnitude during the inspiral,
varies in direction by less than $\sim 5^\circ$. The maximum variation in the
direction of $\vec J$ occurs when the spins are nearly antialigned with the
orbital angular momentum. Based on our results...

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## Holographic phase transitions from higgsed, non abelian charged black holes

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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We find solutions of a gravity-Yang-Mills-Higgs theory in four dimensions
that represent asymptotic anti-de Sitter charged black holes with partial/full
gauge symmetry breaking. We then apply the AdS/CFT correspondence to study the
strong coupling regime of a $2+1$ quantum field theory at temperature $T$ and
finite chemical potential, which undergoes transitions to phases exhibiting the
condensation of a composite charged vector operator below a critical
temperature $T_c$, presumably describing $p+ip/p$-wave superconductors. In the
case of $p+ip$-wave superconductors the transitions are always of second order.
But for $p$-wave superconductors we determine the existence of a critical value
$\alpha_c$ of the gravitational coupling (for fixed Higgs v.e.v. parameter
$\hat m_W$) beyond which the transitions become of first order. As a
by-product, we show that the $p$-wave phase is energetically favored over the
$p+ip$ one, for any values of the parameters. We also find the ground state
solutions corresponding to zero temperature. Such states are described by
domain wall geometries that interpolate between $AdS_4$ spaces with different
light velocities, and for a given $\hat m_{W}$, they exist below a critical
value of the coupling. The behavior of the order parameter as function of the
gravitational coupling near the critical coupling suggests the presence of
second order quantum phase transitions. We finally study the dependence of the
solution on the Higgs coupling...

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## Characterizing Seller-Driven Black-Hat Marketplaces

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 07/05/2015
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This paper investigates two seller-driven black-hat online marketplaces,
SEOClerks and MyCheapJobs, aiming to shed light on the services they offer as
well as sellers and customers they attract. We perform a measurement-based
analysis based on complete crawls of their websites and find that the vast
majority of services target popular social media and e-commerce websites, such
as website backlinks, Instagram followers, or Twitter retweets, and estimate
revenues to be at least $1.3M for SEOClerks and $116K for MyCheapJobs. Our
analysis uncovers the characteristics of these two non-underground
seller-driven marketplaces and shows that many top sellers belong to an
"insider ring", where accounts created close to the marketplaces' launch
account for the majority of the sales. We provide first-of-its-kind evidence
that marketplace operators may be involved in perpetuating fraudulent
activities and hope to facilitate deployment of technical, legal, and economic
countermeasures.

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## Tidal Interaction between a Fluid Star and a Kerr Black Hole in Circular Orbit

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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We present a semi-analytic study of the equilibrium models of close binary
systems containing a fluid star (mass $m$ and radius $R_0$) and a Kerr black
hole (mass $M$) in circular orbit. We consider the limit $M\gg m$ where
spacetime is described by the Kerr metric. The tidally deformed star is
approximated by an ellipsoid, and satisfies the polytropic equation of state.
The models also include fluid motion in the stellar interior, allowing binary
models with nonsynchronized stellar spin (as expected for coalescing neutron
star-black hole binaries) to be constructed. Tidal disruption occurs at
orbital radius $r_{\rm tide}\sim R_0(M/m)^{1/3}$, but the dimensionless ratio
$\hat r_{\rm tide}=r_{\rm tide}/[R_0(M/m)^{1/3}]$ depends on the spin parameter
of the black hole as well as on the equation of state and the internal rotation
of the star. We find that the general relativistic tidal field disrupts the
star at a larger $\hat r_{\rm tide}$ than the Newtonian tide; the difference is
particularly prominent if the disruption occurs in the vicinity of the black
hole's horizon. In general, $\hat r_{\rm tide}$ is smaller for a (prograde
rotating) Kerr black hole than for a Schwarzschild black hole. We apply our
results to coalescing black hole-neutron star and black hole-white dwarf
binaries. The tidal disruption limit is important for characterizing the
expected gravitational wave signals and is relevant for determining the
energetics of gamma ray bursts which may result from such disruption.; Comment: 29 pages including 8 figures. Minor changes and update. To appear in
ApJ...

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## Black Hole Entropy

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 23/12/1994
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In the talk different definitions of the black hole entropy are discussed and
compared. It is shown that the Bekenstein-Hawking entropy $S^{BH}$ (defined by
the response of the free energy of a system containing a black hole on the
change of the temperature) differs from the statistical- mechanical entropy
$S^{SM}=-\mbox{Tr}(\hat{\rho}\ln \hat{\rho})$ (defined by counting internal
degrees of freedom of a black hole). A simple explanation of the universality
of the Bekenstein-Hawking entropy (i.e. its independence of the number and
properties of the fields which might contribute to $S^{SM}$) is given.; Comment: 16 pages, LaTeX; Talk at the Winnipeg Heat Kernel Conference (Aug,94)

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## Exact and asymptotic black branes with spherical compactification

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 13/02/2012
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#General Relativity and Quantum Cosmology#Astrophysics - High Energy Astrophysical Phenomena#High Energy Physics - Phenomenology#High Energy Physics - Theory

In the six-dimensional Kaluza-Klein model with the multidimensional
cosmological constant $\Lambda_6$, we obtain the black brane with spherical
compactification of the internal space. The matter source for this exact
solution consists of two parts. First, it is a fine-tuned homogeneous perfect
fluid which provides spherical compactification of the internal space. Second,
it is a gravitating massive body with the dustlike equation of state in the
external space and tension $\hat p_1=-(1/2)\hat\varepsilon$ in the internal
space. This solution exists both in the presence and absence of $\Lambda_6$. In
the weak-field approximation, we also get solutions of the linearized Einstein
equations for the model with spherical compactification. Here, the gravitating
matter source has the dustlike equation of state in the external space and an
arbitrary equation of state $\hat p_1=\Omega \hat\varepsilon$ in the internal
space. In the case $\Lambda_6>0$ and $\Omega\neq -1/2$, these approximate
solutions tend asymptotically to the weak-field limit of the exact black brane
solution. Both the exact and asymptotic black branes satisfy the gravitational
experiments at the same level of accuracy as general relativity.; Comment: 6 pages, no figures

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## Thermodynamics of Third Order Lovelock-Born-Infeld Black Holes

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 30/09/2011
Português

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We here explore black holes in the third order Lovelock gravity coupling with
nonlinear Born-Infeld electromagnetic field. Considering special second and
third order coefficients ($\hat{\alpha}_2^2=3\hat{\alpha}_3=\alpha^2$), we
analyze the thermodynamics of third order Lovelock-Born-Infeld black holes and,
in 7-dimensional AdS space-time, discuss the stability of black holes in
different event horizon structures. We find that the cosmological constant
$\Lambda$ plays an important role in the distribution of stable regions of
black holes.; Comment: 11 pages, 21 figures

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## Black Hole Entropy: Off-Shell vs On-Shell

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

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Different methods of calculation of quantum corrections to the
thermodynamical characteristics of a black hole are discussed and compared. The
relation between on-shell and off-shell approaches is established. The
off-shell methods are used to explicitly demonstrate that the thermodynamical
entropy $S^{TD}$ of a black hole, defined by the first thermodynamical law,
differs from the statistical-mechanical entropy $S^{SM}$, determined as
$S^{SM}=-\mbox{Tr}(\hat{\rho}^H\ln\hat{\rho}^H)$ for the density matrix
$\hat{\rho}^H$ of a black hole. It is shown that the observable thermodynamical
black hole entropy can be presented in the form $S^{TD}=\pi {\bar
r}_+^2+S^{SM}-S^{SM}_{Rindler}$. Here ${\bar r}_+$ is the radius of the horizon
shifted because of the quantum backreaction effect, and $S^{SM}_{Rindler}$ is
the statistical-mechanical entropy calculated in the Rindler space.; Comment: 47 pages, latex, 7 postscript figures have been included since the
first submission of the article

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## Dyonic Non-Abelian Black Holes

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

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We study static spherically symmetric dyonic black holes in
Einstein-Yang-Mills-Higgs theory. As for the magnetic non-abelian black holes,
the domain of existence of the dyonic non-abelian black holes is limited with
respect to the horizon radius and the dimensionless coupling constant $\alpha$,
which is proportional to the ratio of vector meson mass and Planck mass. At a
certain critical value of this coupling constant, $\hat \alpha$, the maximal
horizon radius is attained. We derive analytically a relation between $\hat
\alpha$ and the charge of the black hole solutions and confirm this relation
numerically. Besides the fundamental dyonic non-abelian black holes, we study
radially excited dyonic non-abelian black holes and globally regular
gravitating dyons.; Comment: LaTeX, 22 pages, 16 figures, three figures added, file manipulation
error in previous replace

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## Black Hole Entropy: Thermodynamics, Statistical-Mechanics and Subtraction Procedure

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 26/03/1996
Português

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The thermodynamical one-loop entropy $S^{TD}$ of a two-dimensional black hole
in thermal equilibrium with the massless quantum gas is calculated. It is shown
that $S^{TD}$ includes the Bekenstein-Hawking entropy, evaluated for the
quantum corrected geometry, and the finite difference of statistical mechanical
entropies $-Tr\hat{\rho}\ln\hat{\rho}$ for the gas on the black hole and
Rindler spaces. This result demonstrates in an explicit form that the relation
between thermodynamical and statistical-mechanical entropies of a black hole is
non-trivial and requires special subtraction procedure.; Comment: 11 pages, latex file

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## Final Mass and Spin of Merged Black Holes and the Golden Black Hole

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

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#General Relativity and Quantum Cosmology#Astrophysics - Solar and Stellar Astrophysics#High Energy Physics - Phenomenology

We present results on the mass and spin of the final black hole from mergers
of equal mass, spinning black holes. The study extends over a broad range of
initial orbital configurations, from direct plunges to quasi-circular inspirals
to more energetic orbits (generalizations of Newtonian elliptical orbits). It
provides a comprehensive search of those configurations that maximize the final
spin of the remnant black hole. We estimate that the final spin can reach a
maximum spin $a/M_h \approx 0.99\pm 0.01$ for extremal black hole mergers. In
addition, we find that, as one increases the orbital angular momentum from
small values, the mergers produce black holes with mass and spin parameters
$\lbrace M_h/M, a/M_h \rbrace$ ~spiraling around the values $\lbrace \hat
M_h/M, \hat a/M_h \rbrace$ of a {\it golden} black hole. Specifically,
$(M_h-\hat M_h)/M \propto e^{\pm B\,\phi}\cos{\phi}$ and $(a-\hat a)/M_h
\propto e^{\pm C\,\phi}\sin{\phi}$, with $\phi$ a monotonically growing
function of the initial orbital angular momentum. We find that the values of
the parameters for the \emph{golden} black hole are those of the final black
hole obtained from the merger of a binary with the corresponding spinning black
holes in a quasi-circular inspiral.; Comment: Version accepted for publication in Phys. Rev. D Rapid Comm.

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