油船货油加热蒸汽供给阀的液动控制设计

为实现货油蒸汽供给阀开度的自动控制,设计蒸汽供给阀动作的液动控制方案,通过主动油缸和从动油缸的运动关系,实现对蒸汽供给阀开度的远距离控制。确定以液压为动力源的计算机控制比例溢流阀,搭建主动油缸和从动油缸带动蒸汽供给阀系统实验平台,先对主动油缸和从动油缸跟随性、偏差性、可控性进行系统测试,再进行阀门开度PID控制的测试。结果表明,蒸汽供给阀的液动控制方案实现对蒸汽供给阀阀门开度的自动控制。

福建武夷山气候变化与林业有害生物对植被生态的影响

以武夷山为研究区域,应用2000—2019年武夷山植被生态质量指数、气候要素观测资料和林业有害生物监测资料,统计分析植被生态质量指数月、季、年多时间尺度特征,对月、年时间尺度影响植被生态质量指数的平均气温、降水量基本气候要素进行相关分析,并对武夷山林业有害生物松毛虫发生的气候影响因子和植被生态质量指数的关系进行分析。研究结果表明:近20 a武夷山植被生态质量不断上升,2018年达到最高值,质量指数与对应月平均气温和月降水量均具有较好的相关性,武夷山林业有害生物松毛虫年发生面积与月平均气温、月降水量和月植被生态质量指数具有一定相关性,这些研究成果可为当地政府开展林业有害生物防治和植被生态系统治理提供科学决策依据。

Study on the Promotion of Wound Healing in Mice with Burn Injuries by Bioactive Glass 1393

Objective:To investigate the effect and mechanism of bioactive glass1393 on wound healing in mice with burn injuries.Methods:A benchtop temperature-controlled scald instrument was used to establish a mouse burn wound model,which was divided into an injury group(simple scald group)and a bioactive glass 1393treatment group.The wound healing of burn injuries in mice was observed at different times after the operation,and the formation of granulation tissue,collagen deposition and tissue proliferation in the wounds were observed by HE staining,Masson staining and Ki67 staining,and the levels of apoptosis-related proteins and the expression of wnt3a/β-catenin signaling pathway were detected in the wounds by Western blot.Results:Compared with the injury group,the bioactive glass 1393 group accelerated burn wound healing and promoted granulation tissue formation,collagen deposition,and cell proliferation.In addition,compared with the injury group,the bioactive glass 1393 group promoted the expression of Bcl-2 protein,inhibited the expression of Bax protein and up-regulated the expression of Wnt3a andβ-catenin protein.Conclusion:Bioactive glass 1393 promotes burn wound healing in mice by inhibiting apoptosis through modulation of wnt3a/β-catenin signaling pathway.

废热驱动的船用喷射制冷-转轮除湿空调性能参数分析

为研究可由废热驱动的喷射制冷-转轮除湿空调系统在船舶上应用的节能特性,结合实船空调的设计参数,在不同的引射系数条件下计算并分析系统的蒸汽耗量、功耗和COP等性能参数的变化规律,并与传统船用空调进行对比.结果表明,引射系数为0.1~0.9时,蒸汽耗量从2851.1kg/h降至804.2kg/h,功耗从52.54kW降至35.83kW,COP从6.34增至9.29,可获得59.33%~72.27%的节能效果.但是对蒸汽耗量和功耗的降低贡献大部分是在引射系数较低时取得,引射系数从0.1增至0.2~0.3的贡献占56.25%~75%,而从0.3增至0.9的贡献仅占25%.由此可知,船用喷射制冷-转轮除湿空调具有良好的节能潜力,但当引射系数增大到0.2~0.3后,进一步增大引射系数对节能降耗的效果改善不明显.因此,在构建系统时应综合考虑,无须采用过高的引射系数.该研究为喷射制冷-转轮除湿空调在船舶上的应用提供了参考依据,具有一定的指导意义.