稀土元素铈对霍山石斛类原球茎悬浮培养细胞生长和多糖合成的影响

研究外源稀土元素铈对霍山石斛类原球茎悬浮培养细胞生长、多糖合成、培养基中碳氮磷源消耗的动力学特性,以及对胞内糖、胞内氮、胞内磷转化的影响。结果表明：适量的铈能够改善霍山石斛类原球茎对碳氮源的利用,提高胞内糖、胞内氮、胞内磷的含量,从而促进细胞生长和多糖合成。以添加10μmol/L 的铈效果最好,细胞的生长速率从0.501g/(L·d)提高到0.649g/(L·d);培养至24d 时,每升培养液中类原球茎干质量为25.45g,比对照提高了20.2%,培养至18d 多糖总质量浓度达到峰值3.35g/L,是对照的1.53 倍。     

Laboratory assessment of insecticidal effectiveness of natural zeolite and diatomaceous earth formulations against three stored-product beetle pests

The insecticidal effectiveness of two natural zeolite formulations (Minazel plus and Minazel), applied to wheat at selected rates of 0.25, 0.50 and 0.75 g/kg, and a diatomaceous earth formulation (DE) (Protect-It™), applied at the recommended rates of 0.15 g/kg for Sitophilus oryzae, 0.20 g/kg for Rhyzopertha dominica and 0.30 g/kg for Tribolium castaneum, were tested under laboratory conditions (24 ± 1 °C temperature and 45 ± 5% relative humidity). The highest adult mortality was observed after the longest exposure period of 21 days and 7 days of recovery, when all three zeolite dosage rates and the recommended DE dosage caused 97-100% mortality of S. oryzae and 94-100% of T. castaneum. On the other hand, 100% mortality was not achieved in any test variant involving R. dominica; the highest (about 92%) was detected for DE, while 52% and 79% mortality was achieved with the zeolites at the highest rate of 0.75 g/kg. Progeny reduction by >90% was achieved after 21 days of contact of all three beetle pests with DE-treated wheat, while the same level of reduction was achieved for S. oryzae and T. castaenum only after contact with the highest rate of the zeolite product, Minazel. Thus the two zeolite formulations are comparable to diatomaceous earth in controlling adult S. oryzae, R. dominica and T. castaneum, but only the Minazel formulation could effectively protect wheat from attack by S. oryzae or T. castaneum, and only with a higher rate of application than for the DE formulation.     

Novel sericin‐fixing agent containing rare‐earth ion for weighting silk fiber

Silk fibers were weighted with different weight gain rate by using a novel sericin‐fixing agent containing rare‐earth ion. Laser Raman spectra, scanning electron microscope (SEM), and amino acid analysis were studied to characterize the structures of weighted fibers. Laser Raman spectra verified that the content of the highly oriented β‐sheet conformation decreased in the weighted fibers. Amino acid analyses showed that the content of polar amino acid increased with the increase in weight gain rate. SEM analyses showed that the sericin was successfully fixed on the surface of the fibroin. Moreover, the mechanical and dyeing properties of the weighted fibers were also investigated. The results indicate that there was no significant difference in breaking strength and elongation between the weighted fibers and the control; the equilibrium moisture content and the color strength value (K/S) of the weighted fibers increased with increasing weight gain rate.     

稀土元素 La 和 Ce 对小球藻生长的影响

本文以普通小球藻（Chlorella vulgaris）作为受试藻种,研究了硝酸镧和硝酸铈对其生长的影响,旨在探讨稀土化合物用于小球藻培养的方法和效果。具体实验包括：在藻类培养基中添加不同浓度的稀土硝酸盐,定时取样测定培养物光密度,绘制生长曲线并计算比生长速率（μ）,测定细胞密度最大时的干物质含量、叶绿素含量、类胡萝卜素含量以及可溶性糖含量。通过实验得出：10-3~10-6 mM的稀土元素在培养早期能够促进小球藻的细胞增殖,但随着培养时间延长促进作用减弱,比生长速率与对照组的差异逐渐缩小;10-3 mM La可将叶绿素a和b的含量分别提高24.46%和28.51%,10-4mM的Ce可将其分别提高50.76%和38.92%;此外,10-3mM La或Ce可分别将胞内可溶性糖含量提高13.83%和34.88%。上述研究表明：在藻类培养基中添加一定浓度的La或Ce,可以加快小球藻细 胞的早期增殖速度,缩短获得最大生物量的培养时间,同时还可提高叶绿素、类胡萝卜素以及可溶性糖的含量,但是两种稀土元素的效应浓度范围略有差异。     

Wind-Thermal Environmental Characteristic of Multi-Variable Passive Enhanced Natural Ventilation System for High and Large Space Building

Natural ventilation effects in high and large space buildings of tropical areas greatly affect the air conditioning energy consumption. Aiming at nearly zero energy building design, this paper mainly contributes to provide theoretical basis and reference for thermal comfortable air conditioning system design of high and large space buildings. Taking a theatre in Hainan as study object, a newly composite enhanced natural ventilation system is proposed by integrating the underground tunnel-based earth to air heat exchange system and the solar chimney. Ventilation quantity, air velocity and air temperature field, human vertical temperature gradient difference under 24 simulation working conditions are considered and analyzed by using ANSYS Fluent. For the underground tunnel, results show that Group Two with double underground tunnels and side air supply location shows its advantages in cooling effects and air supply uniformity. Then for the solar chimney, results show that the solar radiation intensity contributes to larger difference in transmission power and leads to different cooling effects. On the whole, the system under working condition No. 7 with 120 m long, side air supply, double underground tunnel and 20 m high, 1 m wide, 0.6° absorber plate angle solar chimney shows its priority in better comprehensive performance.     

基于SEP的卫星网络三维仿真系统的设计

中低轨道卫星网络现已成为当前卫星通信的发展方向,由于拓扑的复杂性和时变特性,高昂的造价和建造的复杂性使仿真成为研究工作必不可少的重要环节。介绍了自组织网络仿真平台（SEP,Self-organization network Emulation Platform）,该平台通过控制中心和终端节点的配合协作进行仿真,引入三维建模技术,研究建立了中低轨道卫星网络三维仿真系统。该系统能够动态显示中低轨道卫星组网以及整个网络路由的三维变化,具有较高的卫星网络仿真通用性,可为各种空间系统应用提供仿真测试环境。     

掺稀土离子液体激光器的研究进展

综合介绍了掺稀土离子液体激光器的主要发展历程,分析了掺稀土离子液体激光材料研究过程中需要解决的主要问题包括降低无辐射跃迁、增大溶解度和减少热致折射率梯度引起的光偏折损耗等.重点介绍了稀土离子在溶液中的无辐射跃迁机理以及降低无辐射跃迁的措施.     

激光对DSP卫星探测器干扰效能研究

为降低导弹预警卫星对弹道导弹预警定位能力,从分析导弹预警卫星红外探测系统入手,在介绍了激光干扰光电探测器机理的基础上,综合了激光器输出功率、激光束质量、跟踪瞄准精度和大气等因素的影响,定量地评估了激光武器对红外探测系统的饱和干扰能力,最终分别给出了一定条件下地、空、天基激光武器对DSP预警星载探测器饱和干扰能力.     

水的相变传热和大气垂直传热对地球系统负熵流的贡献

地球系统中的水在太阳辐射的作用下,在地表高温状态下吸热发生由液态到气态的相变,水汽上升到空中后在低温状态下凝结为雨或雪而放热,雨雪在重力的作用下返回地面,这种水的相变传热会导致地球系统中负熵的出现。对该负熵的数量级作了估算。同时讨论了大气的垂直传热与重力场效应引起的负熵。     

红外卫星对通用高超滑翔导弹的可探测性分析

随着临近空间高超声速技术的迅猛发展和临近空间高超声速导弹的装备使用,新的军事威胁已成为现实。由于临近空间高超声速导弹飞行弹道低且具有机动飞行的特点,需要对它进行实时探测跟踪才有可能对其飞行弹道进行预测。受地球曲率等因素的影响,地面雷达系统对临近空间高超声速导弹的探测距离有限,且组网探测对雷达数量需求庞大,因此卫星探测是一种较好的手段。对美国当前大力发展的海陆军通用型高超声速滑翔体(Common Hypersonic Glide Body, C-HGB)的红外辐射特性进行了初步分析,并结合高轨红外预警卫星的探测能力,初步分析了预警卫星对处于滑翔飞行阶段的C-HGB的可探测性。结果表明,当前的高轨红外预警卫星难以实现对处于滑翔段的C-HGB的探测,所以需要改进卫星红外探测系统或者组建低轨卫星星座。