Clevis joint for deployable space structures

This invention relates generally to pin clevis joints, and more particularly, to zero play pin clevis joints for connecting structural members of a deployable space structure. A joint includes a pin, a tang, and a shackle. The pin is tapered at the same angle as the bores extending through the projections of the shackle and the tang. A spring washer biases the tang onto the tapered sidewall of the pin. The invention solves the free play problem associated with deployable space structures by using a tapered pin which is held in tapered holes by the spring washers

Brylinski\u27s sheaf complex for proper Lie groupoids

In this talk we generalize Brylinski\u27s sheaf complex from G-manifolds to proper Lie groupoids. Moreover, we explain the connection between this complex and the cyclic homology theory of the convolution algebra of the underlying proper Lie groupoid. The talk is on joint work with H. Posthuma and X. Tang

Sweating method in Shang Han Lun

Sweating method（汗法）is the first therapeutic methods described in Shang Han Lun （伤寒论Treatise on Cold Damage Disease）by Zhang Zhongjing in the East Han Dynasty (3rd century AD, about 200-219 AD). This method is mainly used for treating exterior syndrome of Taiyang Disease (Greater Yang) Disease. Its first representative formula is Mahuang Tang (麻黄汤 Ephedra Decoction). Additionally, there are many other formulas that can also be classified in the category of sweating method to treat associated or deteriorated syndromes mainly in Taiyang Disease. These formulae are: Gegen Tang (葛根汤 Pueraria Decoction) Da Qinglong Tang（大青龙汤 Major Blue Dragon Decoction） Xiao Qinglong Tang (小青龙汤 Minor Blue Dragon Decoction) Mahuang Xingren Gancao Shigao Tang（麻黄杏仁甘草石膏汤Ephedra, Bitter Apricot Seed, Licorice and Gypsum Decoction） Guizhi Mahuang Ge Ban Tang (桂枝麻黄各半汤Half Cinnamon Half Ephedra Decoction), Guizhi Er Mahuang Yi Tang (桂枝二麻黄一汤Two Cinnamon One Ephedra Decoction） Mahuang Xixin Fuzi Tang（麻黄细辛附子汤Ephedra, Asarum and Aconite Decoction） Mahuang Fuzi Gancao Tang (麻黄附子甘草汤 Ephedra，Aconite and Licorice Decoction

Energy constrained sandpile models

We study two driven dynamical systems with conserved energy. The two automata contain the basic dynamical rules of the Bak, Tang and Wiesenfeld sandpile model. In addition a global constraint on the energy contained in the lattice is imposed. In the limit of an infinitely slow driving of the system, the conserved energy $E$ becomes the only parameter governing the dynamical behavior of the system. Both models show scale free behavior at a critical value $E_c$ of the fixed energy. The scaling with respect to the relevant scaling field points out that the developing of critical correlations is in a different universality class than self-organized critical sandpiles. Despite this difference, the activity (avalanche) probability distributions appear to coincide with the one of the standard self-organized critical sandpile.Comment: 4 pages including 3 figure

Estimating the mass of the hidden charm 1+(1+)1^+(1^{+}) tetraquark state via QCD sum rules

By using QCD sum rules, the mass of the hidden charm tetraquark $[cu][\bar{c}\bar{d}]$ state with $I^{G} (J^{P}) = 1^+ (1^{+})$ (HCTV) is estimated, which presumably will turn out to be the newly observed charmonium-like resonance $Z_c^+(3900)$. In the calculation, contributions up to dimension eight in the operator product expansion(OPE) are taken into account. We find $m_{1^+}^c = (3912^{+306}_{-153}) \, \text{MeV}$, which is consistent, within the errors, with the experimental observation of $Z_c^+(3900)$. Extending to the b-quark sector, $m_{1^+}^b = (10561^{+395}_{-163}) \,\text{MeV}$ is obtained. The calculational result strongly supports the tetraquark picture for the "exotic" states of $Z_c^+(3900)$ and $Z_b^+(10610)$.Comment: 13 pages,3 figures, 1 table, version to appear in EPJ

Breakdown of self-organized criticality

We introduce two sandpile models which show the same behavior of real sandpiles, that is, an almost self-organized critical behavior for small systems and the dominance of large avalanches as the system size increases. The systems become fully self-organized critical, with the critical exponents of the Bak, Tang and Wiesenfeld model, as the system parameters are changed, showing that these systems can make a bridge between the well known theoretical and numerical results and what is observed in real experiments. We find that a simple mechanism determines the boundary where self-organized can or cannot exist, which is the presence of local chaos.Comment: 3 pages, 4 figure