深化人事制度改革 建立良好运行机制

2002年8月,按照市水利局事业单位人事制度改革的总体要求,2002年底前完成局属事业单位处以下人员的身份转变,从国家用人变单位用人。这是一项十分艰巨的任务,关系到每位职工的切身利益和单位的发展方向。     

猕猴桃采后冷害及其防控技术研究进展

猕猴桃是后熟型果实,低温贮藏是保持果实品质、延缓果实成熟衰老的最基本、最优效的方式之一;但猕猴桃是冷敏性水果,不适当的低温会造成猕猴桃贮藏期间冷害发生。本文总结了猕猴桃采后冷害发生特征、条件以及生理生化机制方面的研究进展,介绍了猕猴桃采后冷害抗性机制及冷害防控措施研究现状。本文可为猕猴桃生产中冷害防控提供方法参考,为猕猴桃冷害发生分子机制研究提供理论借鉴。     

《福寿》

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双宫丝绵纤维的性能检测

通过对双宫丝绵纤维的主要物理力学性能及纤维形态进行检测,并与对照组的普通丝绵和蛹衬丝绵的性能进行比较,分析双宫丝绵压缩回弹性优良的原因。测定了双宫丝绵的压缩回弹性和纤维强伸力,结果表明:双宫丝绵的回复率96%,压缩率53%;单丝平均断裂强力4.43 c N,断裂伸长25.42%,这些指标均高于对照组的普通丝绵和蛹衬丝绵,双宫丝绵的回弹性达到了蚕丝被优等品的国家标准。电镜下观察到双宫丝绵的纤维较其他两种丝绵纤维的直径粗、长度长,丝纤维之间形成纵横交错的网络多。测试结果显示双宫丝绵优良的性能与它的结构有关。     

基于DSP的变电站巡检机器人控制系统研制与应用

提出双位机模式的变电站智能巡检机器人控制系统,采用具有伺服控制功能的DSP芯片,配备多种总线通讯、可靠的电源管理模块及驱动模块,较好地实现了巡检机器人控制的智能性和稳定性。介绍以DSP芯片作为核心处理器的开放式控制系统的总体结构、硬件组成及运作流程。变电站现场的实际应用验证了该控制系统具有良好的自主避障能力、抗干扰能力和运行稳定性。     

加快自身建设争创一流队伍

北京市防汛抗旱办公室是北京市防汛抗旱指挥部的办事机构,负责组织、处理、协调全市防汛抗旱的日常工作;承担对全市86个分指挥部(驻京部队、有关委、办、局、总公司、全市18个区县及水利管理单位)防汛抗旱工作的指挥调度、检查指导、监督落实及维护管理等职责.     

高应变率下多尺寸聚丙烯纤维混凝土动态压缩力学性能研究

采用Φ74mm的分离式霍普金森压杆(Split Hopkinson pressure bar,SHPB)试验装置,对两种尺寸聚丙烯细纤维和一种尺寸聚丙烯粗纤维单掺及混掺的混凝土试件进行冲击压缩试验,对比分析粗、细纤维及不同纤维掺量比的多尺寸纤维混凝土试件在五种不同应变率下的动态压缩强度、动态压缩变形、动态压缩韧性和破坏特征,研究聚丙烯纤维混凝土的动态压缩力学性能。结果表明:随应变率的增加,素混凝土及纤维混凝土的动态压缩强度、动态压缩变形和动态压缩韧性表现出显著的应变率效应;在试验应变率范围内,粗聚丙烯纤维混凝土的动态抗压强度最高,相对素混凝土增幅为132.36%~213.85%;多尺寸聚丙烯纤维混凝土的动态强度增长因子与素混凝土基本一致;掺入多尺寸聚丙烯纤维可有效增大混凝土在不同应变率下的动态峰值应变和动态极限应变;多尺寸聚丙烯纤维混凝土的动态极限韧性较高,其中细聚丙烯纤维含量为1.2kg/m~3时混凝土动态极限韧性最高,增幅为121.11%。     

物业税又见风生水起

热传数年的物业税开征风声又起。2009年5月25日,中国政府网公布《国务院批转发展改革委关于2009年深化经济体制改革工作意见的通知》,通知中再次提出要深化房地产税制改革,研究开征物业税。     

Preparation and characteristics of bombyx mori sericin / tussah silk fibroin / gelatin-based blended antibacterial films北大核心CSCD

A large number of wound dressings are currently used in the treatment of burns chronic ulcers etc. An ideal wound dressing should prevent dehydration of the wound and retain a favorable moist environment at the wound interface. It should have good antibacterial properties and be easily removed without trauma too. Wound dressings are generally made of readily available bio-materials that require minimal processing possess nontoxic non-allergenic and antimicrobial properties as well as promote wound healing. Clinically collagen chitin chitosan etc. are usually used as materials for producing wound dressings as these materials are capable of accelerating the healing processes at molecular cellular and individual levels. Tussah silk fibroin bombyx mori sericin and gelatin non-toxic and extensive have good bio-compatibility degradability and film-forming properties which are conducive to cell adhesion. In order to prepare safe biofilms with excellent antibacterial properties we prepared a kind of bombyx mori sericin / tussah silk fibroin / gelatin BS-TSF-GEL blended film by using tussah silk fibroin bombyx mori sericin and gelatin as bio-based materials and polyethylene glycol 200 as the cross-linking agent. Firstly we designed the single factor experiment and orthogonal experiment to optimize the preparation process of the BS-TF-GEL blended film. On this basis the blended film was modified with ethanol of different concentrations to improve its strength and crystallinity. The structure and properties of the blended film were characterized by measuring the dissolution loss rate tensile properties microscopic morphology and crystal structure. Finally antimicrobial peptides were loaded by adsorption to obtain the BS-TSF-GEL antimicrobial film. The results showed that the ratio of the optimum formula for the (BS-TSF-GEL) blended film required a mixture of bombyx mori sericin (4. 50 μg / mL) and tussah silk fibroin (27. 5 mg / mL) with a volume ratio of 2:1 polyethylene glycol 200 and gelatin solution (360 mg / mL) which accounted for 35% 40% and 25% respectively of the total system. The dissolution loss rate of the BS-TSF-GEL blended film was 34. 62% the elongation at break was 34. 15% and the breaking strength was 578. 8 kPa after being treated with anhydrous ethanol. FTIR and X-ray diffraction results showed that Silk Ⅱ dominated the BS-TSF-GEL blended film while Silk Ⅰ was in a small amount. The BS-TSF-GEL blended film was pale yellow and porous on the surface which was the ideal material for loading antimicrobial peptides. The BS-TSF-GEL blended film loaded with antimicrobial peptides had a good inhibitory effect on both Escherichia coli and Staphylococcus aureus. It is expected to be used in the field of disposable biomedical materials such as wound dressings. In this study three natural materials with unique advantages were selected as substrates for biofilms and polyethylene glycol with high bio-safety was used as the cross-linking agent to enhance the application value of the blended film by loading antimicrobial peptides. The results broaden the application field of silkworm silk and provide a new way for the development and exploitation of silk fibroin in biological dressings and other medical bio-materials. Bombyx mori sericin tussah silk fibroin and gelatin have been widely used in biological tissue engineering as natural biological materials. In this study three natural materials were used as the biofilm substrate to successfully prepare excellent-performance BS-TSF-GEL blend film using polyethylene glycol cross-linking and ethanol post-treatment techniques. Moreover specific properties can be conferred by replacing different loading substances such as antimicrobial biofilm carrying antimicrobial peptides and biofilm sustained release carrier loading drugs. In addition 3D printing electrostatic spinning and other technologies can also be used to shape the BS-TSF-GEL into different shapes to meet the application requirements under different conditions. In conclusion the research results explore a new way for the application of silk protein. © 2022 Authors. All rights reserved.     

先秦儒家学贤用能思想及其对现代管理者的意义

对先秦儒家举贤用能思想的历史作用和局限性进行分析，指出举贤用能思想对现代管理活动的重要意义在于：识人择才必须注重德才、学`训能力的考察，把握标准，知人善任。