9,297 research outputs found
Fractional Path Integrals and its degeneration to Dimensional Regularization
In this work we study particles propagate in a fractional path and use
fractional derivatives to extend the dynamic dimension of Quantum Field Theory.
we construct the Lagrangian of fractional scalar, vector and spinor fields to
obtain their propagators by path integral. Then we compute the typical tree
level and one loop diagrams which correspond to QED cases. The calculations
show the dimension dependence of amplitudes. Additionally, in one loop
calculation we obtain results which are consistent with dimensional
regularization as the dimension approaches to the Standard Model value.
Therefore, the fractional Path Integrals can be regarded as an equivalent
theoretical representation for regularizing the divergence in the normal
Quantum Field Theory. We also derive the equation of motion for scalar, vector
and spinor particles propagate in fractal paths and discuss the corresponding
gauge symmetry, where we find a special non-local gauge transformation.Comment: 17page
Evolution Logic and Revelations of the Financial Policy of Chinese Compulsory Education Since the Reform and Opening Up
As a special form of the general public policy, the financial policy of compulsory education also possesses the essential attributes of it. Since the reform and opening up, the basic sequence of the financial policy of Chinese compulsory education is: equalization of distribution orientation; nationalization of obligation put in; centralization of coordination system as well as standardization of supervision. By analyzing the evolution process of the financial policy of compulsory education, it is found that it follows the top-down-supply-led mechanism and the value orientation of balanced development, as public spirit is the basic feature of reform. What’s more, in this thesis, the theory on the coordination of policy is also utilized to shed light on the non-independence of the evolution in the financial policy of Chinese compulsory education
Effects of Vanadium doping on BaFe2As2
We report an investigation of the structural, magnetic and electronic
properties of Ba(Fe(1-x)V(x))2As2 using x-ray, transport, magnetic
susceptibility and neutron scattering measurements. The vanadium substitutions
in Fe sites are possible up to 40\%. Hall effect measurements indicate strong
hole-doping effect through V doping, while no superconductivity is observed in
all samples down to 2K. The antiferromagnetic and structural transition
temperature of BaFe2As2 is gradually suppressed to finite temperature then
vanishes at x=0.245 with the emergence of spin glass behavior, suggesting an
avoided quantum critical point (QCP). Our results demonstrate that the avoided
QCP and spin glass state which were previously reported in the superconducting
phase of Co/Ni-doped BaFe2As2 can also be realized in non-superconducting
Ba(Fe(1-x)V(x))2As2.Comment: 5 pages, 6 figure
A Study of Test Suite Reduction Based on Ant Lion Optimizer
The development of smart meters to Internet of Things is the infrastructure for the Internet to carry out user electricity management and enhance user experience with electricity. As the iteration of smart home service system based on smart meters continues to accelerate, the development process is becoming more and more demanding for software testing. Test suite reduction is one of the common methods to improve the efficiency of software testing. In this paper, we proposed an optimization algorithm based on the Ant Lion Optimizer applied to test suite reduction problem of smart IoT meters. The algorithm improved the traditional Ant Lion Optimizer by converting the smart IoT meter test suite reduction problem into a binary coverage problem and combining the Greedy Algorithm to obtain the optimal test case subset. The experimental results showed that the algorithm based on Ant Lion Optimizer performed better on the test suite reduction problems compared to similar algorithms
Emerging Strategies in TCR-Engineered T Cells
Immunotherapy of cancer has made tremendous progress in recent years, as demonstrated by the remarkable clinical responses obtained from adoptive cell transfer (ACT) of patient-derived tumor infiltrating lymphocytes, chimeric antigen receptor (CAR)-modified T cells (CAR-T) and T cell receptor (TCR)-engineered T cells (TCR-T). TCR-T uses specific TCRS optimized for tumor engagement and can recognize epitopes derived from both cell-surface and intracellular targets, including tumor-associated antigens, cancer germline antigens, viral oncoproteins, and tumor-specific neoantigens (neoAgs) that are largely sequestered in the cytoplasm and nucleus of tumor cells. Moreover, as TCRS are naturally developed for sensitive antigen detection, they are able to recognize epitopes at far lower concentrations than required for CAR-T activation. Therefore, TCR-T holds great promise for the treatment of human cancers. In this focused review, we summarize basic, translational, and clinical insights into the challenges and opportunities of TCR-T. We review emerging strategies used in current ACT, point out limitations, and propose possible solutions. We highlight the importance of targeting tumor-specific neoAgs and outline a strategy of combining neoAg vaccines, checkpoint blockade therapy, and adoptive transfer of neoAg-specific TCR-T to produce a truly tumor-specific therapy, which is able to penetrate into solid tumors and resist the immunosuppressive tumor microenvironment. We believe such a combination approach should lead to a significant improvement in cancer immunotherapies, especially for solid tumors, and may provide a general strategy for the eradication of multiple cancers
Entanglement control in one-dimensional random XY spin chain
The entanglement in one-dimensional random XY spin systems where the
impurities of exchange couplings and the external magnetic fields are
considered as random variables is investigated by solving the different
spin-spin correlation functions and the average magnetization per spin. The
entanglement dynamics near particular locations of the system is also studied
when the exchange couplings (or the external magnetic fields) satisfy three
different distributions(the Gaussian distribution, double-Gaussian
distribution, and bimodal distribution). We find that the entanglement can be
controlled by varying the strength of external magnetic field and the different
distributions of impurities. Moreover, the entanglement of some
nearest-neighboring qubits can be increased for certain parameter values of the
three different distributions.Comment: 13 pages, 4 figure
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