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In this paper, we consider symmetric jump processes of mixed-type on metric measure spaces under general volume doubling condition, and establish stability of two-sided heat kernel estimates and heat kernel upper bounds. We obtain their stable equivalent characterizations in terms of the jumping kernels, variants of cut-off Sobolev inequalities, and the Faber-Krahn inequalities. In particular, we establish stability of heat kernel estimates for

Semantic refinement of stakeholders＇ requirements is a fundamental issue in requirements engineering. Facing with the on-demand collaboration problem among the heterogeneous, autonomous, and dynamic service resources in the Web, service requirements refinement becomes extremely important, and the key issue in service requirements refinement is semantic interoperability aggregation. A method for creating connecting ontologies driven by requirement sign ontology is proposed. Based on connecting ontologies, a method for semantic interoperability aggregation in requirements refinement is proposed. In addition, we discover that the necessary condition for semantic interoperability is semantic similarity, and the sufficient condition is the coverability of the agreed mediation ontology. Based on this viewpoint, a metric framework for calculating semantic interoperability capability is proposed. This methodology can provide a semantic representation mechanism for refining users＇ requirements; meanwhile, since users＇ requirements in the Web usually originate from different domains, it can also provide semantic interoperability guidance for networked service discovery, and is an effective approach for the realization of on-demand service integration. The methodology will be beneficial in service-oriented software engineering and cloud computing.

In this review, we present a summary of some recent experiments on topological insulators (TIs) and superconducting nanowires and films. Electron-electron interaction (EEI), weak anti-localization (WAL) and anisotropic magneto-resistance (AMR) effect found in topological insulator films by transport measurements are reported. Then, transport properties of superconducting films, bridges and nanowires and proximity effect in non-superconducting nanowires are described. Finally, the interplay between topological insulators and superconductors (SCs) is also discussed.

The effect of the turbulence intensity of the oncoming stream on the aerodynamic characteristics of the NACA-0012 airfoil is investigated by a direct numerical simulation. The numerical results are found to be consistent with the experimental measurements. Based on the finite spectral QUICK scheme, the simulation gets the high accuracy results. Both the simulation and the experiment reveal that the airfoil stall does not exist for the low turbulence intensity, however, occurs when the turbulence intensity increases sufficiently. Besides, the turbulence intensity has a significant effect on both the airfoil boundary layer and the separated shear layer.

目的：探讨推拿功法《易筋经》练习对膝骨关节炎（Knee Osteoarthritis，KOA）患者股四头肌肌力的影响，为推拿功法《易筋经》干预KOA提供科学依据。方法：将90例KOA患者随机分为观察组和对照组，每组45例。观察组进行《易筋经》锻炼，每日1次：对照组不予任何治疗。观察8星期后进行疗效评定。结果：观察8星期后，观察组患者股四头肌等速肌力较治疗前有显著改善，对照组患者股四头肌等速肌力无明显变化。结论：推拿功法《易筋经》练习对改善KOA患者股四头肌肌力具有一定作用，是干预该疾病的有效运动方法。

高校图书馆员是图书馆的核心组成部分,馆员接受继续教育,对自身科研素养与工作效率的提高起着至关重要的作用。混合学习模式将面对面培训与在线学习整合,具有降低继续教育成本和提高继续教育效率的双重意义,该模式能够充分调动高校图书馆员学习的积极性与创造性。

Objective To observe the clinical effect of acupuncture for perimenopausal depression. Methods Ninety cases were randomly allocated into treatment group ( n =60) and control group ( n =30) according to the visit sequence. Patients in the treatment group were treated with acupuncture, once daily, and 10 times constituted one treatment course. Patients in the control group took Premarin tablet and medroxyprogesterone acetate for 3 cycles of menses. Results The total effective rate was 95.0% in the treatment group, and 87.7% in the control group ( P <0.05). The HAMD scores were decreased in both groups, and it was lower in the treatment group than in the control group ( P <0.05 or P <0.01). Conclusion Acupuncture has good effects on perimenopausal depression.