3,280 research outputs found
Measuring a transmon qubit in circuit QED: dressed squeezed states
Using circuit QED, we consider the measurement of a superconducting transmon
qubit via a coupled microwave resonator. For ideally dispersive coupling,
ringing up the resonator produces coherent states with frequencies matched to
transmon energy states. Realistic coupling is not ideally dispersive, however,
so transmon-resonator energy levels hybridize into joint eigenstate ladders of
the Jaynes-Cummings type. Previous work has shown that ringing up the resonator
approximately respects this ladder structure to produce a coherent state in the
eigenbasis (a dressed coherent state). We numerically investigate the validity
of this coherent state approximation to find two primary deviations. First,
resonator ring-up leaks small stray populations into eigenstate ladders
corresponding to different transmon states. Second, within an eigenstate ladder
the transmon nonlinearity shears the coherent state as it evolves. We then show
that the next natural approximation for this sheared state in the eigenbasis is
a dressed squeezed state, and derive simple evolution equations for such states
using a hybrid phase-Fock-space description.Comment: 18 pages, 8 figures; v2 published versio
On the H\'enon-Lane-Emden conjecture
We consider Liouville-type theorems for the following H\'{e}non-Lane-Emden
system
\hfill -\Delta u&=& |x|^{a}v^p \text{in} \mathbb{R}^N,
\hfill -\Delta v&=& |x|^{b}u^q \text{in} \mathbb{R}^N, when ,
. The main conjecture states that there is no non-trivial
non-negative solution whenever is under the critical Sobolev hyperbola,
i.e. .
We show that this is indeed the case in dimension N=3 provided the solution
is also assumed to be bounded, extending a result established recently by
Phan-Souplet in the scalar case.
Assuming stability of the solutions, we could then prove Liouville-type
theorems in higher dimensions.
For the scalar cases, albeit of second order ( and ) or of fourth
order ( and ), we show that for all dimensions in the
first case (resp., in the second case), there is no positive solution
with a finite Morse index, whenever is below the corresponding critical
exponent, i.e (resp., ).
Finally, we show that non-negative stable solutions of the full
H\'{e}non-Lane-Emden system are trivial provided \label{sysdim00}
N<2+2(\frac{p(b+2)+a+2}{pq-1}) (\sqrt{\frac{pq(q+1)}{p+1}}+
\sqrt{\frac{pq(q+1)}{p+1}-\sqrt\frac{pq(q+1)}{p+1}}).Comment: Theorem 4 has been added in the new version. 23 pages, Comments are
welcome. Updated version - if any - can be downloaded at
http://www.birs.ca/~nassif/ or http://www.math.ubc.ca/~fazly/research.htm
Complete Genome Sequence of Aneurinibacillus migulanus E1, a Gramicidin S- and d-Phenylalanyl-l-Propyl Diketopiperazine-Deficient Mutant
ACKNOWLEDGMENTS This work was supported by the European Union’s Seventh Framework Programme grant 245268 (ISEFOR; to L.B.). Further support came from the SwissBOL project (the Swiss Federal Office for the Environment, to L.B.) and the Sciex-Scientific Exchange Programme NMS.CH (to L.L. and L.B.).Peer reviewedPublisher PD
POSSIBLE IMPACTS OF ICT BASED DEMAND-RESPONSIVE PUBLIC TRANSPORTATION SCHEMES IN THE FREE STATE
Published Conference ProceedingsReliability and accessibility of public transportation are major concerns. ICT based demand responsive schemes can be the ultimate solution to these problems. Even though Demand Responsive Transportation solutions have always been conventional for cabs to meet individual traveller’s needs, they have not been used for buses and mini-bus taxis in the Free State. Therefore, they can be considered to provide reliable and flexible transportation to meet the public’s momentary transportation needs at affordable rates using taxis and buses. Current accessibility problems like long walking distance to bus stops and long waiting times can be solved using demand responsive schemes and cheaper demand based minibus taxi or bus services would reduce the use of expensive cabs. This would reduce public transportation reliability, accessibility, affordability and efficiency problems, but might not have the same impact on operators and public transportation users. The benefits they might have on public transportation users could lead to immediate or long-term consequences for the operators. This paper aims at evaluating the possible impacts of using ICT based technologies and applications for demand responsive public transportation in the Free State province and how they may impact public transportation operators and users in terms of dead mileage, travel times, intensity of demand in different areas and acceptance of these schemes by the public and operators
Maximum Resilience of Artificial Neural Networks
The deployment of Artificial Neural Networks (ANNs) in safety-critical
applications poses a number of new verification and certification challenges.
In particular, for ANN-enabled self-driving vehicles it is important to
establish properties about the resilience of ANNs to noisy or even maliciously
manipulated sensory input. We are addressing these challenges by defining
resilience properties of ANN-based classifiers as the maximal amount of input
or sensor perturbation which is still tolerated. This problem of computing
maximal perturbation bounds for ANNs is then reduced to solving mixed integer
optimization problems (MIP). A number of MIP encoding heuristics are developed
for drastically reducing MIP-solver runtimes, and using parallelization of
MIP-solvers results in an almost linear speed-up in the number (up to a certain
limit) of computing cores in our experiments. We demonstrate the effectiveness
and scalability of our approach by means of computing maximal resilience bounds
for a number of ANN benchmark sets ranging from typical image recognition
scenarios to the autonomous maneuvering of robots.Comment: Timestamp research work conducted in the project. version 2: fix some
typos, rephrase the definition, and add some more existing wor
Antibody response to hepatitis b immunization in Egyptian children with sickle cell disease
Background: Despite improvement in the safety of blood products, sickle cell disease (SCD) and thalassemic patients are at greater risk than the general population for hepatitis B infection and chronic liver disease, making hepatitis B immunization especially important for this population. This study was conducted to evaluate and follow up the antibody response to hepatitis B vaccination, in patients with SCD, after 1-15 years of vaccination. Methods: participants were 30 SCD and 30 thalassemic patients attending the Hematology Department, Children’s Hospital, Cairo University as well as 30 ages and sex matched normal controls. They were subjected to clinical evaluation, complete blood count, and measurement of liver transaminases, serum bilirubin, and serum ferritin levels as well as estimation of anti-HBs titer by enzymatic immunoassay. Results: Anti-HBs titers in SCD patients ranged between 5.6 and 381 IU/L (54.83 ± 15.30), while the levels of thalassemic patients ranged between 16 and 343 IU/L (93.4 ± 30) and those of the control group ranged from 10 to 523 IU/L (83.4 ± 28.1) which revealed statistically significant decrease in SCD patients compared to thalassemic and healthy controls (p =0.0317). Out of the 30 SCD patients, 40% showed anti-HBs titer below 10 IU/L (non-protective titer), while none of the thalassemic patients or the control group revealed the same. Achievement of a protective titer had no correlation with sex, consanguinity, or any of the clinical or laboratory data tested. Conclusion: Immune dysfunction in thalassemia is not playing a major role in response to hepatitis B vaccination. However, SCD children should have their anti-HBs titer measured after routine hepatitis B immunization to ensure that they achieved protective titer, then after 1 year of vaccination and repeated every 5 years and those who do not seroconvert should receive additional doses. Booster HBV vaccination of unprotected SCD patients seems mandatory.Keywords: sickle cell, immunity, hepatitis B, immunizationEgypt J Pediatr Allergy Immunol 2010;8(2):67-7
Blood Transfusion in Patients with Sickle Cell Disease Requiring Laparoscopic Cholecystectomy
Laparoscopic cholecystectomy in patients with sickle cell disease was found to be safe without preoperative blood transfusion
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