Two new species of the genus Stenus Latreille from China (Coleoptera: Staphylinidae: Steninae)

Two new species of the genus Stenus Latreille (subgenus Stenus s. str.) are described: Stenus (s. str.) affinisecretus, sp. n., from Beijing, and S. (s. str.) guandiensis, sp. n., from Shanxi, China. These two new species were collected in the mountain areas. Important morphological characters, like those of hind wings, 8th and 9th abdominal sternites of male, and the aedeagus are illustrated for the new species. All the types are deposited in the Institute of Zoology, Chinese Academy of Sciences, Beijing

Recovery of High Purity Calcium Sulfate from Phosphogypsum I: Thermodynamic Study of SO42- Purification

Chemical agents SO42- and Ca2+ in phosphogypsum could be recycled to make high-purity calcium sulfate whisker. A key step in this process is to decompose phosphogypsum using NaOH solution to obtain Na2SO4 solution and Ca(OH)2 residue. In this decomposition process, thermodynamic analysis indicates that the majority of impurities reports to the residue phase Ca(OH)2，with minor amounts of Si and Al impurities end up in Na2SO4 solution in forms of Na2SiO3 and KAlO2. Based on phase diagram at 25oC for the Na2SO4-SiO32--AlO2- system, Si and Al impurities may be removed via precipitation by adjusting pH value of the Na2SO4 solution. In verification tests on a sodium phosphate solution of pH 13.2 with 17.7mg/L of Al and 3.41mg/L of Si, when pH was adjusted to 12 no Al was detected in the solution with 8.48% Si removal. After solution pH was further lowered to 7, Al was still negligible in the liquid phase, but Si removal was increased to 75.89%.

Two-field Models of Dark Energy with Equation of State Across -1

In this paper, we study the possibility of building two-field models of dark energy with equation of state across -1. Specifically we will consider two classes of models: one consists of two scalar fields (Quintessence+Phantom) and another includes one scalar (Phantom) and one spinor field (Neutrino). Our studies indicate to some extent that two-field models give rise to a simple realization of the dynamical dark energy model with the equation of state across $w = -1$.Comment: 5 pages, 4 figures Revtex

Demonstration of Deutsch's Algorithm on a Stable Linear-Optical Quantum Computer

We report an experimental demonstration of quantum Deutsch's algorithm by using linear-optical system. By employing photon's polarization and spatial modes, we implement all balanced and constant functions for quantum computer. The experimental system is very stable and the experimental data are excellent in accordance with the theoretical results.Comment: 7 pages, 4 figure