This study takes the close relationship between cultural heritage and rural revitalization as its perspective, using Yi ethnic clothing as an example. It explores the role of ethnic clothing in promoting rural revitalization, emphasizing the multidimensional role and significance of traditional culture in rural revitalization. It summarizes theoretical and practical experiences and proposes a new pattern of rural comprehensive revitalization through the protection and innovation of traditional culture.
许多证据表明缓慢的水动力条件是水华暴发的重要诱因,尽管以临界流速和水体置换为基础的流量管理实践在水华控制中已见成效,但受限于水动力对藻类生长小生境的干扰机制尚不明晰,长期的流量管理实践效果并不理想.在长期野外观测、围隔实验和室内模拟等一系列研究的基础上,以现有水动力对藻类影响机制的讨论为依据,从细胞学角度提出了水动力对藻类生长影响的3种不同的概念机制,即低强度的水力扰动导致藻细胞外扩散层厚度变薄,有利于周边水体向藻细胞输送营养物质,促进藻类生长;中等强度的水力扰动导致藻类营养盐吸收及光合作用能力受损,抑制藻类生长;高强度的水流剪切导致藻细胞壁破损.基于该机制认为流量管理中临界流速应分别从水体置换和细胞学两方面考虑.研究结果可为流量管理中控制藻类水华暴发和维持水体水质的策略提供重要的理论支持.;Numerous studies have shown that low flow condition is the main trigger of algae bloom and flow management is widely acknowledged as a strategy for inhibiting bloom development based on critical flow velocity and replacement.Due to the underlying intervention mechanism is still not clear, long-term practices of flow management are not very effective. Based on the research progress and a series of studies through long-term observation, enclosure and laboratory experiments, we present the conceptual mechanism that there existed three different mechanisms of hydrodynamic impacts on freshwater algae:(1) low turbulent flow results in the thickness of cell diffuse layer thinner in favor of nutrients transport from water phase to algae cell,which is preferred by algae growth; (2) medium turbulent flow is harmful to nutrients absorption and light availability of algae and inhibits the algae growth; (3) high shear force can damage the algae cell walls, which are individually determinant in different levels of flow intensity. According to theories, critical flow velocity should be applied from two different aspects of water replacement and cytology in flow management. The results will be of great scientific significance in order to control algle bloom and remain the water quality in flow management.
A new photocatalytic reactor with a thin-film TiO 2 catalyst attached on the inner wall of quartz glass pipes under UV light radiation was assembled and applied for the removal of hexachlorobenzene (HCB) in water.The results indicated that the degradation effect of HCB was higher in the UV/photocatalytic system at lower flow velocities owing to the longer residence time.As the UV light intensity increased, the degradation efficiency of HCB was enhanced correspondingly.Moreover, an enhancement on the removal effect of HCB was observed with the addition of humic acid.It should be noted that the improvement extent of HCB removal rate was much higher at low humic acid concentration compared to that at higher humic acid concentration.The phenomenon can be ascribed to the photosensitization in the presence of suitable amount of humic acid in the photoreaction system.To further describe these effects, a mathematical model was developed and then verified with experimental data, which validated the predictive capability and demonstrated the removal ratio in terms of initial HCB concentration and UV light intensity.
The transition process to film pool boiling in microgravity is studied experimentally aboard the Chinese recoverable satellite SJ-8. A quasi-steady heating method is adopted, in which the heating voltage is controlled to increase exponentially with time. Small, primary bubbles are formed and slid on the surface, which coalesce with each other to form a large coalesced bubble. Two ways are observed for the transition from nucleate to film boiling at different subcoolings. At high subcooling, the coalesced bubble with a smooth surface grows slowly. It is then difficult for the coalesced bubble to cover the whole heater surface, resulting in a special region of transition boiling in which nucleate boiling and local dry areas can coexist. In contrast, strong oscillation of the coalesced bubble surface at low subcooling may cause rewetting of local dry areas and activation of more nucleate sites, resulting in an abrupt transition to film boiling.
Nucleate pool boiling on micro-pin-finned surface structure is proposed for efficiently cooling electronic components with high heat flux in microgravity, and was verified by experiments performed utilizing the drop tower Beijing. Micro-pin-fins with the dimensions of 50 x 60 mu m(2) (thickness x height) and the space of 50 mu m were fabricated on the chip surface by the dry etching technique. FC-72 was used as the working fluid. Nucleate pool boiling of FC-72 on a smooth surface was also tested for comparison. Unlike much obvious deterioration of heat transfer of nucleate pool boiling on the smooth surface in microgravity, constant heater surface temperature of nucleate pool boiling for the micro-pin-finned surface was observed, even though a large coalesced bubble completely covered the surface under microgravity condition. The performance of high efficient heat transfer on micro-pin-finned surface is independent of the gravity, which stems from the sufficient supply of fresh liquid to the heater surface due to the capillary forces.
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