Gravitating tensor monopole in a Lorentz-violating field theory

We present a solution of the coupled Einstein and rank-two antisymmetric tensor field equations where Lorentz symmetry is spontaneously broken, and we discuss its observational signatures. Especially, the deflection angles have important qualitative differences between tensor and scalar monopoles. If a monopole were to be detected, it would be discriminated whether or not to correspond to a tensor one. This phenomenon might open up new direction in the search of Lorentz violation with future astrophysical observations.Comment: 5 pages, 4 figure

Modeling and Analysis of an Air-Breathing Flexible Hypersonic Vehicle

By using light-weighted material in hypersonic vehicle, the vehicle body can be easily deformed. The mutual couplings in aerodynamics, flexible structure, and propulsion system will bring great challenges for vehicle modeling. In this work, engineering estimated method is used to calculate the aerodynamic forces, moments, and flexible modes to get the physics-based model of an air-breathing flexible hypersonic vehicle. The model, which contains flexible effects and viscous effects, can capture the physical characteristics of high-speed flight. To overcome the analytical intractability of the model, a simplified control-oriented model of the hypersonic vehicle is presented with curve fitting approximations. The control-oriented model can not only reduce the complexity of the model, but also retain aero-flexible structure-propulsion interactions of the physics-based model and can be applied for nonlinear control

A Two-Dimensional CA Traffic Model with Dynamic Route Choices Between Residence and Workplace

The Biham, Middleton and Levine (BML) model is extended to describe dynamic route choices between the residence and workplace in cities. The traffic dynamic in the city with a single workplace is studied from the velocity diagram, arrival time probability distribution, destination arrival rate and convergence time. The city with double workplaces is also investigated to compared with a single workplace within the framework of four modes of urban growth. The transitional region is found in the velocity diagrams where the system undergoes a continuous transition from a moving phase to a completely jamming phase. We perform a finite-size scaling analysis of the critical density from a statistical point of view and the order parameter of this jamming transition is estimated. It is also found that statistical properties of urban traffic are greatly influenced by the urban area, workplace area and urban layout.Comment: 18 pages, 13 figure

Characterization of the Antheraea pernyi abnormal wing disc gene that may contribute to its temperature tolerance

It has been known that the abnormal wing disc (awd) gene encodes a nucleoside diphosphate kinase and is closely related to wing development in Drosophila melanogaster and Bombyx mori. In the present study, the awd gene was isolated and characterized from Antheraea pernyi, a well-known wild silkmoth. The isolated cDNA sequence is 666 bp in length with an open reading frame of 462 bp encoding a polypeptide of 153 amino acids, which contains a putative nucleoside diphosphate kinases active site motif and conserved multimer interface. The deduced A. pernyi awd protein sequence reveals 75, 82 and 96% identity with its homologue of Homo sapiens, D. melanogaster, and B. mori, respectively. Semi-quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) analysis showed that the awd gene was transcribed during all four developmental stages (egg, larva, pupa, and moth), and present in all tissues tested (blood, midgut, silk glands, Malpighian tublues, spermaries, ovaries, brain, muscle, fat body and body wall), with the highest abundance in Malpighian tubules. Interestingly, mRNA expression level in pupal fat body was significantly down-regulated after cold shock (4°C) compared with the control (26°C) and significantly up-regulated after heat shock (46°C). The results indicated that the A. pernyi awd gene is inducible, and that its expression effect is different after cold stress and heat stress. Consequently, we refer that the product of the awd gene may contribute to its temperature tolerance.Key words: Antheraea pernyi, abnormal wing disc gene, cloning, expression pattern, temperature stress

Non-Gaussianity in the warm k-inflation

This paper presents and investigates non-Gaussian perturbations for the warm k-inflation model that is driven by pure kinetic energy. The two complementary components of the overall non-Gaussianity are the three-point and four-point correlations. The intrinsic non-Gaussian component, denoted as the nonlinear parameter f_{NL}^{int}, is rooted in the three-point correlation for the inflaton field. Meanwhile, the \delta N part non-Gaussianity, denoted as f_{NL}^{\delta N}, is the contribution attributed to the four-point correlation function of the inflaton field. In this paper, the above two components in warm k-inflation are individually computed and analyzed. Then, comparisons and discussions between them are conducted, and the non-Gaussian theoretical results are compared with experimental observations to determine the range of model parameters within the allowable range of observation

Pročišćavanje i karakterizacija antioksidativnoga peptida iz hidrolizata proteina suncokreta

Sunflower proteins were hydrolyzed with Flavourzyme for the production of antioxidant peptide. DEAE-Sepharose Fast Flow, Sephadex G-25 gel filtration chromatography and reversed-phase HPLC were consecutively employed to purify a novel sunflower antioxidant peptide, and the ability to inhibit the autoxidation of pyrogallol was expressed as the antioxidative activity of the peptide. The amino acid sequence was identified as Ala-Cys-Ala-His-Asp-Lys-Val by a Q-Tof2 mass spectrometer. This novel peptide exhibited a high antioxidative activity of 79.42 U/mL, which is expected to protect against oxidative damage in living systems in relation to aging and carcinogenesis. Higher antioxidative activities were presumed mainly due to the presence of hydrophobic amino acids in its sequence.Za dobivanje novog peptida antioksidativnih svojstava hidrolizirani su proteini suncokreta pomoću enzima Flavourzyme. Nakon toga je peptid pročišćen prolaskom kroz DEAE-Sepharose kolonu, zatim filtracijskom kromatografijom na Sephadex G-25 gelu i naposljetku primjenom HPLC kromatografije obrnutih faza. Antioksidativna svojstva peptida izražena su kao sposobnost inhibiranja autooksidacije pirogalola. Pomoću Q-Tof2 masenog spektrometra određena je sekvencija aminokiselina: Ala-Cys-Ala-His-Asp-Lys-Val. Peptid je imao izraženu antioksidativnu aktivnost od 79,42 U/mL, što znači da bi mogao štititi stanice od oksidativnih oštećenja povezanih sa starenjem ili nastankom raka. Pretpostavlja se da takva antioksidativna svojstva rezultat uzrokuje prisutnost hidrofobnih aminokiselina u sekvenciji