21,663 research outputs found
Do Stronger Intellectual Property Rights Protection Induce More Bilateral Trade? Evidence from China's Imports
Most of the previous studies on the effect of IPR protection on international trade have been from the perspective of major industrialized nations. However, much of the current debate on the effects of IPR protection involves large developing countries with high threat of imitation. This study contributes to the literature by analyzing the impact of the strengthening of patent laws in China on its bilateral trade flows. We estimate the effects of patent rights protection on China’s imports at the aggregate and detailed product categories for both OECD (developed) and non-OECD (developing) countries. The empirical results suggest that increased patent rights protection stimulate China’s imports, particularly in the knowledge-intensive product categories. Furthermore, while the evidence in support of the market expansion effect is significant for imports from OECD countries, it is rather weak and mostly insignificant for imports from non-OECD countries.Intellectual property rights, patent laws, international trade, International Relations/Trade, F13, 034,
Ab initio modeling of the energy landscape for screw dislocations in body-centered cubic high-entropy alloys
In traditional body-centered cubic (bcc) metals, the core properties of screw
dislocations play a critical role in plastic deformation at low temperatures.
Recently, much attention has been focused on refractory high-entropy alloys
(RHEAs), which also possess bcc crystal structures. However, unlike
face-centered cubic high-entropy alloys (HEAs), there have been far fewer
investigations on bcc HEAs, specifically on the possible effects of chemical
short-range order (SRO) in these multiple principal element alloys on
dislocation mobility. Here, using density functional theory, we investigate the
distribution of dislocation core properties in MoNbTaW RHEAs alloys, and how
they are influenced by SRO. The average values of the core energies in the RHEA
are found to be larger than those in the corresponding pure constituent bcc
metals, and are relatively insensitive to the degree of SRO. However, the
presence of SRO is shown to have a large effect on narrowing the distribution
of dislocation core energies and decreasing the spatial heterogeneity of
dislocation core energies in the RHEA. It is argued that the consequences for
the mechanical behavior of HEAs is a change in the energy landscape of the
dislocations which would likely heterogeneously inhibit their motion
Criteria for reliable entanglement quantification with finite data
We propose one and a half criteria for determining how many measurements are
needed to quantify entanglement reliably. We base these criteria on Bayesian
analysis of measurement results, and apply our methods to four-qubit
entanglement, but generalizations to more qubits are straightforward.Comment: >4
Singlet-triplet relaxation induced by confined phonons in nanowire-based quantum dots
The singlet-triplet relaxation in nanowire-based quantum dots induced by
confined phonons is investigated theoretically. Due to the
quasi-one-dimensional nature of the confined phonons, the singlet-triplet
relaxation rates exhibit multi-peaks as function of magnetic field and the
relaxation rate between the singlet and the spin up triplet state is found to
be enhanced at the vicinity of the singlet-triplet anti-crossing. We compare
the effect of the deformation-potential coupling and the piezoelectric coupling
and find that the deformation-potential coupling dominates the relaxation rates
in most cases.Comment: 7 pages, 5 figure
Synthesis and Characterization of Nanostructured Nickel Diselenide NiSe2 from the Decomposition of Nickel Acetate, (CH3CO2)2Ni
Solution processed NiSe2 nanorods were synthesized by a modified colloidal synthesis technique, by chemical reaction of TOPSe and nickel acetate at 150 ∘C. The rods exist as an oleic acid ligand stabilized solution, with oleic acid acting as a capping group. Structural characterization by X-ray diffraction and transmission electron microscopy indicates that the particles are rod-like shaped crystals with a high and relatively constant aspect ratio (30 : 1). TEM shows that the width and the length of the nanorods are in the range 10–20nm and 300–350 nm, respectively. XRD indicates that the nanorods are pure and well crystallized. The size of nanorods based on the Debye-Scherrer effect, was 150 nm, the average value of length and width. They display thermal stability over prolonged heating times (\u3c100 \u3ehours) at 150 ∘C, for which the average particle size is roughly constant. After about 100 hours of heating time there is an onset and growth of micron sized cubes and concurrent decomposition of NiSe2 to Ni and NiSe at 150 ∘C
Entanglement verification with finite data
Suppose an experimentalist wishes to verify that his apparatus produces
entangled quantum states. A finite amount of data cannot conclusively
demonstrate entanglement, so drawing conclusions from real-world data requires
statistical reasoning. We propose a reliable method to quantify the weight of
evidence for (or against) entanglement, based on a likelihood ratio test. Our
method is universal in that it can be applied to any sort of measurements. We
demonstrate the method by applying it to two simulated experiments on two
qubits. The first measures a single entanglement witness, while the second
performs a tomographically complete measurement.Comment: 4 pages, 3 pretty picture
M Theory on and Superconformal Field Theories
We study the large N limit of the interacting superconformal field theories associated with N M5 branes or M2 branes using the recently proposed relation between these theories and M theory on AdS spaces. We first analyze the spectrum of chiral operators of the 6d (0,2) theory associated with M5 branes in flat space, and find full agreement with earlier results obtained using its DLCQ description as quantum mechanics on a moduli space of instantons. We then perform a similar analysis for the D_N type 6d (0,2) theories associated with M5 branes at an R^5/Z_2 singularity, and for the 3d N=8 superconformal field theories associated with M2 branes in flat space and at an R^8/Z_2 singularity respectively. Little is known about these three theories, and our study yields for the first time their spectrum of chiral operators (in the large N limit)
Entanglement and purity of single- and two-photon states
Whereas single- and two-photon wave packets are usually treated as pure
states, in practice they will be mixed. We study how entanglement created with
mixed photon wave packets is degraded. We find in particular that the
entanglement of a delocalized single-photon state of the electro-magnetic field
is determined simply by its purity. We also discuss entanglement for two-photon
mixed states, as well as the influence of a vacuum component.Comment: 11 pages, 10 figures, 1 debuting autho
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