高效液相色谱法测定茶叶中游离糖的含量

1引言 茶叶中的游离糖不仅是构成茶叶滋味的主要成分,给茶汤带来甜醇的味道,而且在茶叶加工过程中可发生非酶促褐变作用,生成相应的醛类和吡咯类、吡嗪类等含氮化合物,因而对于茶叶的色泽和香气的形成有重要影响.     

通过费米子隧穿在量子级研究带电黑洞的熵修正

受Majhi等人的半经典近似外的隧穿思想启迪，研究了狄拉克粒子穿过带有整体单极子的Reissner－Nordstrōm黑洞的熵修正．为了正确地得到修正熵，作用量的量子修正项与半经典项的比例常数为普朗克长度平方的倒数，而不是普朗克质量平方的倒数．结果表明Bekenstein—Hawking熵的修正，即Bekenstein—Hawking熵的对数项和逆面积项，在考虑量子效应后可以通过费米子隧穿获得．     

Hawking Radiation from Topological Kerr Anti-de-Sitter Black Hole with One Rotational Parameter via Covariant Anomalies

Using anomalous viewpoint, we study the Hawking radiation from a kind of topological Kerr Anti-de-Sitter （Kerr-AdS） black hole with one rotational parameter. We employ the covariant gauge and gravitational anomalies. The result supports the Robinson-Wilczek opinion and shows that the Hawking temperature can be correctly determined by cancelling covariant gauge and gravitational anomalies at the horizon.     

Non-equilibrium Landauer transport model for Hawking radiation from a Reissner—Nordstrom black hole

The recent work of Nation et al., in which the Hawking radiation energy and entropy flow from a black hole is considered to be produced in a one-dimensional Landauer transport process, is extended to the case of a Reissner- Nordstrom black hole. The energy flow contains not only the contribution of the thermal flux but also that of the particle flux. It is found that the charge can also be transported via the one-dimensional quantum tunnel. Because of the existence of the electrostatic potential, the entropy production rate is shown to be smaller than that of the Schwarzschild black hole.     

Horowitz-Strominger Dilaton黑洞的费米子隧穿

基于Kerner和Mann最近的工作,研究了Horowitz-Strominger Dilaton黑洞膜上的费米子隧穿.由于电磁场将会和物质场和引力场耦合,引入了带电粒子的Dirac方程,由此得到了期待的辐射温度.在考虑自引力相互作用后,发现和标量粒子一样,费米子的隧穿率也满足潜在的幺正原理.     

On particles tunneling from the Taub-NUT-AdS black hole

This paper discusses tunneling of scalar particles and Dirac particles from the Taub-NUT-AdS black hole by the Hamilton--Jacobi equation, initially used by Angheben et al, and the Dirac equation, recently proposed by Kerner and Mann. This is performed in the dragging coordinate frame so as to avoid the ergosphere dragging effect. A general form is obtained for the temperature of scalar and Dirac particles tunneling from the Taub-NUT-Ads black hole, which is commensurate with other methods as expected.     

用反常观点讨论Kerr-de Sitter黑洞在拖曳坐标系下的霍金辐射(英文)

在拖曳坐标系中，从反常的角度讨论了Kerr-de Sitter黑洞的霍金辐射．为了描述可观测的物理现象，我们忽略事件视界处的入射模和宇宙视界处的出射模来建立有效理论．结果表明，用来恢复事件视界和宇宙视界处的规范流和能动张量流精确地等于霍金辐射流．     

Hawking radiation from Kerr--Newman de Sitter black hole via anomalies

In this paper, Hawking radiation from the Kerr Newman de Sitter black hole is studied via gauge anomaly and gravitational anomaly. The obtained results of Hawking radiation from the event horizon and the cosmological horizon accord with those by other methods.     

微波消解样品-火焰原子吸收光谱法测定花卉中金属元素含量

近年来绿色无污染食品颇受大家欢迎。花卉营养丰富,大量临床和医学试验表明,很多花卉和人类疾病的发生、发展或治疗有着密不可分的联系[1-3]。对于花卉的研究,大多集中在皂苷、黄酮、鞣质、生物碱和挥发油等成分的研究上,少有微量元素含