2,477 research outputs found
Schur indices for super-Yang-Mills with more general gauge groups
We study the unflavored Schur indices in the super-Yang-Mills
theory for the gauge groups. We explore two methods, namely
the character expansion method and the Fermi gas method, to efficiently compute
the -series expansion of the Schur indices to some high orders. Using the
available data and the modular properties, we are able to fix the exact
formulas for the general gauge groups up to some high ranks and discover some
interesting new features. We also identify some empirical modular anomaly
equations, but unlike the case of groups, they are quite complicated and
not sufficiently useful to fix exact formulas for gauge groups of arbitrary
rank.Comment: 30 page
Statistical analysis for a penalized EM algorithm in high-dimensional mixture linear regression model
The expectation-maximization (EM) algorithm and its variants are widely used
in statistics. In high-dimensional mixture linear regression, the model is
assumed to be a finite mixture of linear regression and the number of
predictors is much larger than the sample size. The standard EM algorithm,
which attempts to find the maximum likelihood estimator, becomes infeasible for
such model. We devise a group lasso penalized EM algorithm and study its
statistical properties. Existing theoretical results of regularized EM
algorithms often rely on dividing the sample into many independent batches and
employing a fresh batch of sample in each iteration of the algorithm. Our
algorithm and theoretical analysis do not require sample-splitting, and can be
extended to multivariate response cases. The proposed methods also have
encouraging performances in numerical studies
Authenticated Multiparty Quantum Key Agreement Protocol Based on Grover's Algorithm
In the quantum key agreement protocols, some attackers can impersonate legal
participant to participate in the negotiation process and steal the agreement
key easily. This is often overlooked for most quantum key agreement protocols,
which makes them insecure. In this paper, an authenticated multiparty quantum
key agreement protocol based on quantum search algorithm is proposed. In the
protocol, combining classical hash function with identity information, the
authentication operation conforming to the characteristics of search algorithm
is designed. In addition, we give a detailed security analysis, which proves
that the protocol is secure against common attacks and impersonation attacks.
Meanwhile, single particles, which are used as information carries, and
single-particle measurement make our protocol feasible with existing
technology
Can Class-Priors Help Single-Positive Multi-Label Learning?
Single-positive multi-label learning (SPMLL) is a typical weakly supervised
multi-label learning problem, where each training example is annotated with
only one positive label. Existing SPMLL methods typically assign pseudo-labels
to unannotated labels with the assumption that prior probabilities of all
classes are identical. However, the class-prior of each category may differ
significantly in real-world scenarios, which makes the predictive model not
perform as well as expected due to the unrealistic assumption on real-world
application. To alleviate this issue, a novel framework named {\proposed},
i.e., Class-pRiors Induced Single-Positive multi-label learning, is proposed.
Specifically, a class-priors estimator is introduced, which could estimate the
class-priors that are theoretically guaranteed to converge to the ground-truth
class-priors. In addition, based on the estimated class-priors, an unbiased
risk estimator for classification is derived, and the corresponding risk
minimizer could be guaranteed to approximately converge to the optimal risk
minimizer on fully supervised data. Experimental results on ten MLL benchmark
datasets demonstrate the effectiveness and superiority of our method over
existing SPMLL approaches
Nonlinear flutter wind tunnel test and numerical analysis of folding fins with freeplay nonlinearities
AbstractThe flutter characteristics of folding control fins with freeplay are investigated by numerical simulation and flutter wind tunnel tests. Based on the characteristics of the structures, fins with different freeplay angles are designed. For a 0° angle of attack, wind tunnel tests of these fins are conducted, and vibration is observed by accelerometers and a high-speed camera. By the expansion of the connected relationships, the governing equations of fit for the nonlinear aeroelastic analysis are established by the free-interface component mode synthesis method. Based on the results of the wind tunnel tests, the flutter characteristics of fins with different freeplay angles are analyzed. The results show that the vibration divergent speed is increased, and the divergent speed is higher than the flutter speed of the nominal linear system. The vibration divergent speed is increased along with an increase in the freeplay angle. The developed free-interface component mode synthesis method could be used to establish governing equations and to analyze the characteristics of nonlinear aeroelastic systems. The results of the numerical simulations and the wind tunnel tests indicate the same trends and critical velocities
(Sr3La2O5)(Zn1-xMnx)2As2: A Bulk Form Diluted Magnetic Semiconductor isostructural to the "32522" Fe-based Superconductors
A new diluted magnetic semiconductor system, (Sr3La2O5)(Zn1-xMnx)2As2, has
been synthesized and characterized. 10% Mn substitution for Zn in bulk form
(Sr3La2O5)Zn2As2 results in a ferromagnetic ordering below Curie temperature,
TC ~ 40 K. (Sr3La2O5)(Zn1-xMnx)2As2 has a layered crystal structure identical
to that of 32522-type Fe based superconductors, and represents the fifth DMS
family that has a direct counterpart among the FeAs high temperature
superconductor families.Comment: Accepted for publication in EP
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