基于OSPF的陕西省气象宽带网络整合设计

针对陕西省气象局宽带通信网络中移动、电信和广电等3家通信运营商线路并存,IP地址使用杂乱等现状,以及无法方便地实现多链路负载均衡和链路之间自动切换等突出问题,采用了规范3家运营商链路接入的连接方式,应用全国统一的新IP地址,特别是在全网范围内部署OSPF动态路由选择协议等一系列措施。充分发挥OSPF协议的特点,合理地划分区域,并根据需要针对不同链路配置了不同或相同的OSPF代价,使得不同链路间自动切换和流量自动负载均衡得以轻松实现。经过测试,整个网络的设计和实现,充分发挥了多条链路的效益,提高了网络系统的稳定性,达到了设计的预期目标,可以为其他部门网络设计提供较好的借鉴。     

着装厚度气象指数预报

着装厚度气象指数预报是在“服装对环境中气象要素的调节作用”的研究基础上发展的,着重探讨着装厚度与气温、风力的关系,着装厚度与面料（加工服装原材料）的关系,着装厚度与适宜服装款式的品种关系。通过各时段气温、风力的预报值,可预报出四季室外活动适宜服装的款式与种类,为公众服务     

Single-crystal EPR and DFT study of a <Superscript>VI</Superscript>Al–O<Superscript>−</Superscript>–<Superscript>VI</Superscript>Al center in jeremejevite: electronic structure and <Superscript>27</Superscript>Al hyperfine constants

Single-crystal electron paramagnetic resonance (EPR) spectra of a gem-quality jeremejevite, Al₆B₅O₁₅(F, OH)₃, from Cape Cross, Namibia, reveal an S = 1/2 hole center characterized by an ²⁷Al hyperfine structure arising from interaction with two equivalent Al nuclei. Spin-Hamiltonian parameters obtained from single-crystal EPR spectra at 295 K are as follows: g ₁ = 2.02899(1), g ₂ = 2.02011(2), g ₃ = 2.00595(1); A ₁/g _e β _e  = −0.881(1) mT, A ₂/g _e β _e  = −0.951(1) mT, and A ₃/g _e β _e  = −0.972(2) mT, with the orientations of the g ₃- and A ₃-axes almost coaxial and perpendicular to the Al–O–Al plane; and those of the g ₁- and A ₁-axes approximately along the Al–Al and Al–OH directions, respectively. These results suggest that this aluminum-associated hole center represents hole trapping on a hydroxyl oxygen atom linked to two equivalent octahedral Al³⁺ ions, after the removal of the proton (i.e., a ^VIAl–O⁻–^VIAl center). Periodic ab initio UHF and DFT calculations confirmed the experimental ²⁷Al hyperfine coupling constants and directions, supporting the proposed structural model. The ^VIAl–O⁻–^VIAl center in jeremejevite undergoes the onset of thermal decay at 300 °C and is completely bleached at 525 °C. These data obtained from the ^VIAl–O⁻–^VIAl center in jeremejevite provide new insights into analogous centers that have been documented in several other minerals.     

Thermodynamic and magnetic properties of surface Fe<Superscript>3+</Superscript> species on quartz: effects of gamma-ray irradiation and implications for aerosol–radiation interactions

Samples of a natural amethyst, pulverized in air, and irradiated for gamma-ray doses from 0.14 to 70 kGy, have been investigated by powder electron paramagnetic resonance (EPR) spectroscopy from 90 to 294 K. The powder EPR spectra show that the surface Fe³⁺ species on the gamma-ray-irradiated quartz differ from its counterpart without irradiation in both the effective g value and the observed line shape, suggesting marked radiation effects. This suggestion is supported by quantitatively determined thermodynamic properties, magnetic susceptibility, relaxation times, and geometrical radius. In particular, the surface Fe³⁺ species on gamma-ray-irradiated quartz has larger Gibbs and activation energies than its non-irradiated counterpart, suggesting radiation-induced chemical reactions. The shorter phase-memory time (T _m) but longer spin–lattice relaxation time (T ₁) of the surface Fe³⁺ species on the gamma-ray-irradiated quartz than that without irradiation indicate stronger dipolar interactions in the former. Moreover, the calculated geometrical radius of the surface Fe³⁺ species on the gamma-ray-irradiated quartz is three orders of magnitude larger than that of its counterpart on the as-is sample. These results provide new insights into radiation-induced aerosol nucleation, with relevance to atmospheric cloud formation and global climate changes.     

首都机场平流雾特征分析与预报

对2007年2月21日造成首都机场大面积进出港航班延误及取消的平流大雾过程进行了天气形势、物理量场的特征分析,并与2000年1月16日一次典型的平流雾过程进行对比分析,进而对首都机场2000—2007年所有平流雾过程进行统计、对比分析,力图找出平流雾天气的特征。最终总结提出了首都机场平流雾预报的着眼点：在符合大雾产生的弱天气形势下,管区东南部存在大片雾区时,如果通县及首都机场均在凌晨出现暖平流导致的地面异常增温或温度长时间维持不变,加之本场风向转为偏东风或东南风,就应考虑平流雾产生。