Effect of CO2 enrichment on the glucosinolate contents under different nitrogen levels in bolting stem of Chinese kale (Brassica alboglabra L.)

The effects of CO₂ enrichment on the growth and glucosinolate (GS) concentrations in the bolting stem of Chinese kale (Brassica alboglabra L.) treated with three nitrogen (N) concentrations (5, 10, and 20 mmol/L) were investigated. Height, stem thickness, and dry weights of the total aerial parts, bolting stems, and roots, as well as the root to shoot ratio, significantly increased as CO₂ concentration was elevated from 350 to 800 μl/L at each N concentration. In the edible part of the bolting stem, 11 individual GSs were identified, including 7 aliphatic and 4 indolyl GSs. GS concentration was affected by the elevated CO₂ concentration, N concentration, and CO₂×N interaction. At 5 and 10 mmol N/L, the concentrations of aliphatic GSs and total GSs significantly increased, whereas those of indolyl GSs were not affected, by elevated atmospheric CO₂. However, at 20 mmol N/L, elevated CO₂ had no significant effects on the concentrations of total GSs and total indolyl GSs, but the concentrations of total aliphatic GSs significantly increased. Moreover, the bolting stem carbon (C) content increased, whereas the N and sulfur (S) contents decreased under elevated CO₂ concentration in the three N treatments, resulting in changes in the C/N and N/S ratios. Also the C/N ratio is not a reliable predictor of change of GS concentration, while the changes in N and S contents and the N/S ratio at the elevated CO₂ concentration may influence the GS concentration in Chinese kale bolting stems. The results demonstrate that high nitrogen supply is beneficial for the growth of Chinese kale, but not for the GS concentration in bolting stems, under elevated CO₂ condition.     

X线引导下鼻肠管置入及临床应用

目的:探讨x线透视下鼻肠管的置入及其临床应用价值.方法:89例因疾病限制不能经口进食而生命体征相对平稳的危重病患者,鼻肠管经一侧鼻孔插入,在X线引导下将鼻肠管插至十二指肠曲氏韧带附近或更远处的小肠.结果:全部病例鼻肠管均顺利通过幽门插入预定位置,平均置管时间为14.5(7～55)min.置管中及置管后未发生严重并发症.经鼻肠管滴(注)入营养液,促进了患者消化道功能恢复,改善了机体的营养状况,效果满意.结论:X线引导下经鼻鼻肠管置入是一种安全、经济、有效的肠内营养途径,因而具有广泛的临床应用价值.     

一种舰艇防御的目标自动识别算法

研究利用航迹分析方法识别飞航式反舰导弹的滤波器后处理技术,并且导出了基于IF…THEN规则和基于模糊映射的反舰导弹识别判据,在此基础上对这两种识别判据的性能进行了分析对比,这种反舰导弹识别算法利用回归分析和识别判据提取飞航式反舰导弹的航迹特征,给出速度和高度参数,从而断定目标类型,为拦截系统提供参考信息,仿真结果表明,该算法能有效提取目标运动学参数等目标识别信息。     

激光束空间模式可调性与变换研究

利用自适应光学技术,对激光进行模式变换,可将高斯光束转换为均匀的矩形光班,通过采用变形反射镜技术来具体实现对光束空间模式的变换。研究了激光加工过程能量空间分布的实时任意调控原理与方法,试验分析了可主我束对材料的作用规律,从而实现对激光束的刃磨。实验证明此法可提高激光加工的质量和能力。     

混凝土结构软岩大巷断裂过程非线性数值模拟

引入断裂力学原理,以某混凝土结构副大巷中复杂结构为研究对象,通过相似模拟实验和现场观测等手段对有关材料物理力学参数进行识别和修正,结合现场矿压观测结果和相似材料模拟试验结果,对该巷道内部应力破坏敏感部位的内力变形机理进行了系统的分析、模拟计算。研究结果对现场支护设计、维护加固和提高岩层稳定程度具有重要的意义。     

调频步进波形的ISAR回波建模和成像

研究调频步进波形逆合成孔径雷达（ＩＳＡＲ）回波建模和成像的方法,在剖析调频步进雷达信号的数字信号处理方法基础上,建立连续运动目标多散射点的回波模型,提出了用调频步进雷达信号实现连续运动目标的逆合成孔径成像的方法和信号处理方案。通过多个散射点组砀目标的记真,得到不同程度下的目标像,仿真结果证明调频步进波形实现ＩＳＡＲ成像是可行的。     

一类下降算法及其全局收敛性

提出一类无约束优化下降算法,证明了Ａｍｉｊｏ搜索和Ｗｏｌｆｅ搜索下的全局收敛性。算法类似于共轭梯度法,但与其不同,它具有更宽的βｋ选取范围。     

多元cardinal样条空间的极值性质

通过研究多元ｃａｒｄｉｎａｌ样条函数插植的逼近性质,给出了各向异性Ｓｏｂｏｌｅｖ光滑函数类Ｗ＾ｒ∞（Ｒ＾ｄ）在Ｌ∞（Ｒ＾ｄ）尺度下最佳逼近的弱渐近估计,这个结果表明,多元ｃａｒｄｉｎａｌ样条函数空间是各向异性Ｓｏｂｏｌｅｖ光滑类Ｗ＾ｒ∞（Ｒ＾ｄ）在Ｌ∞（Ｒ＾ｄ）尺度下关于无穷维Ｋｏｌｍｏｇｏｒｏｖ宽度的弱渐近极子空间,也表明多元ｃａｒｄｉｎａｌ样条函数插值是实现线性宽度的最优算子。     

Evaluation of Image-Analysis-Based Drape Tester

The performance of image-analysis-based drape tester is studied by analyzing the testing results. The accelerating and decelerating method is used to make the initial testing condition same before draping. A feature vector is proposed to describe the drapeability of fabrics comprehensively. Moreover, the exponential relationship curves between drape coefficient and rotating speed are obtained from the drape tester to describe the dynamic drapeability. Finally, the stability of tested results of image-analysis-based system is studied.     

石墨化度对炭/炭复合材料力学性能的影响

通过三点弯曲试验,并借助SEM断口形貌分析,研究了石墨化度对炭/炭复合材料抗弯强度的影响,对其断裂机制进行了探讨．试验所用材料的基体为沥青浸渍炭+少量CVD炭,增强体炭纤维由乱短纤维和成束长纤维织成的炭布构成,长纤维沿X-Y平面分层铺开,长纤维层之间是随机分布的乱短纤维层．研究结果表明当石墨化度不同时,复合材料的断裂机制不同;在所研究的石墨化度范围28.4%～77.3%内,随着石墨化度的提高,材料的抗弯强度呈现加速下降的趋势;当石墨化度为77.3%时,材料的抗弯强度仅为石墨化度为28.4%时的60%．在石墨化度较低(如27.4%和56.8%)时,材料中的长纤维呈现以拔出机制为主,裂纹沿长纤维束层与乱短纤维层之间的界面传播;在石墨化度较高(如70.6%和77.3%)时,材料中的长纤维被横向切断,裂纹切过长纤维向前传播．这对炭/炭复合材料的研究、开发具有指导意义．