不同取代度的甲壳素磷酸酯钾对番茄种子萌发的作用

用甲壳素合成1^#～7^#甲壳素磷酸酯和甲壳素磷酸酯钾，分别测定1^#～7^#甲壳素磷酸酯的取代度、将甲壳素磷酸酯钾配成O．5mg／L，2mg／L，5mg／L．10mg／L，20mg／L溶液，以蒸馏水为对照，进行番茄(Lycopeysicon esculentum)种子的浸种发芽实验。浸种46．5～76．5h；培养温度29．5C；每只培养皿50粒，每种浓度重复3次。结果表明：6^#、7^#甲壳素磷酸酯钾对番茄种子不具有促进作用；而1^#～5^#甲壳素磷酸酯钾对番茄种子有不同程度的促进作用，其质量浓度以0．5mg/OL～20mg／L为最佳，其中1^#、2^#、3^#、4^#、5^#甲壳素磷酸酯钾对番茄种子的发芽率分别比对照组增长6．7％、17．4％、16．7％、6．0％、16．0％。     

Multi-disciplinary Research in Traditional Chinese Medicine--An Exploration

This paper discusses the present state of Traditional Chinese Medicine being divided into three leading lines of thought, namely, the Clinical line,the Integration of Western and Chinese Medicine line and the Development of Traditional Chinese Medicine line. It also describes the position of Traditional Chinese Medicine being a medical science rich in philosophy and wisdom and a culture centred upon medical science and technology. It outlines the basic characteristic of Traditional Chinese pointed out various flaws in methodology in Integration of Western and Chinese Medicine research. It also stresses that in order to make fruitful progress in the development of Traditional Chinese Medicine,multi-discipline research in Traditional Chinese Medicine should be made on a thoroughly understanding of the basic methodology of Traditional Chinese Medicine and follow its established principles.     

大都市区耕地系统多功能运行效应综合评价:以北京为例

采用能值分析法,通过构建耕地多功能运行效应综合评估框架,建立较高层级耕地功能与系统输出对应关系,对北京耕地系统功能运行效应进行综合评价.研究结果表明:1)北京耕地系统高效运行主要靠大量不可更新工业辅助能的投入,不可更新资源的大量投入,导致系统环境负载率较大,系统的可持续性水平较差,属于典型的消费型系统;2)2014年北京耕地系统产品输出、调节、支持和文化服务输出能值分别占总输出能值的21.28%、21.54%、16.76%和40.42%,耕地服务功能效应发挥显著,尤其是文化娱乐功能,充分体现出大都市区耕地功能逐渐向调节和文化服务功能需求倾斜的特点.     

Crystallographic texture and earing behavior analysis for different second cold reductions of double-reduction tinplate

Since the production of tinplate with non-earing properties is difficult, especially when it is produced via the double-reduction process, the optimal degree of second cold reduction is particularly important for achieving desirable drawing properties. The evolution of texture and the earing propensity of double-reduction tinplate with different extents of second reduction were investigated in this study. Optical microscopy and scanning electron microscopy were used to observe the changes in the microstructure at various extents of reduction. Two common testing methods, X-ray diffraction (XRD) and electron backscatter diffraction, were used to investigate the texture of the specimens, which revealed the effects of deformation percentage on the final texture development and the change in the grain boundary. The earing rate was determined via earing tests involving measurement of the height of any ear. The results obtained from both XRD analyses and earing tests revealed the same ideal value for the second cold reduction on the basis of the relationship between crystallographic texture and the degree of earing.     

High-performance flexural fatigue of carbon nanotube yarns

Carbon nanotube yarns （CNTY） possess good specific strength and specific conductivity. As such, their potential for commercial applications is significant. Fatigue performance is a significant consideration in yarn/wire applications. In this study, the flexural fatigue performance of CNTY spun from super-aligned carbon nanotube arrays was investigated using a reversed bending test. The results showed that CNTY exhibited excellent resistance to pure flexural fatigue, significantly outperforming stainless steel wire; CNTY failed where a combination of flexural fatigue and tension-tension fatigue had special hollow fracture morphology, and CNTY resistance remained fundamentally unchanged in the combination fatigue process.     

金沙江流域月径流时间序列的混沌分析

在介绍重构相空间技术的主要定量指标(关联维数D2和柯尔莫奇诺夫熵)的基础上,以长江上游金沙江流域小黄瓜园站和蔡家村站的月径流时间序列为例详细说明了求取时间序列中的混沌特征数的方法;并且采用主分量分析(PCA分布)方法进一步验证了两个站的径流序列具有混沌特性.得到金沙江流域径流序列的预测年限不应超过7～9个月,为金沙江流域径流预测提供了科学的依据.     

鸟类起源研究取得重大进展

鸟类起源于兽脚类恐龙的假说得到了广泛承认,但鸟类起源研究方向依然存在许多薄弱环节,主要包括鸟类手指同源问题、兽脚类分异时间框架问题以及羽毛起源和早期演化的一些问题。我们近年来在这些问题上取得了一系列重要进展。化石资料显示,兽脚类恐龙在向鸟类进化当中,其外侧两指退化;而现代发育学证据表明,鸟类手指是两侧退化,保留了中间3指。我们通过研究新疆侏罗系地层中发现的泥潭龙,提出了一种外侧和两侧退化模式结合的新假说。该假说可以解释古生物学与发育学资料之间的矛盾。我们报道的一件产自辽宁中上侏罗统髫髻山组的近鸟龙化石,代表了早于始祖鸟的带羽毛的物种,我们提出了包括鸟类在内的主要兽脚类恐龙类群出现于中侏罗世的一个快速演化事件,解决了有关鸟类兽脚类恐龙起源假说的时间悖论问题。我们报道了在北票龙化石中发现的一种新的原始羽毛类型,给出了发育学解释,推测羽毛起源的时间可能在三叠纪中期,对于羽毛起源和早期演化研究具有重要意义。     

第四周期过渡金属钨磷杂多酸盐催化过氧化氢氧化正己醇成正己醛

以Keggin型杂多酸盐 (Na5PW11Z(H2 O)O3 9,Z =Mn ,Fe ,Co,Ni,Cu ,Zn ,以下简称为PW11Z)为催化剂 ,过氧化氢为氧化剂 ,在水—正己醇两相体系中进行了正己醇到正己醛的选择氧化反应 .在此选择氧化反应中同时伴随着过氧化氢分解的竞争反应 ,两种反应间存在着明显的对应关系 .在 70℃时 ,生成正己醛的催化剂活性序列为PW11Co>PW11Fe≈PW11Ni≈PW11Mn >PW11Cu≈PW11Zn ,其中PW11Co的正己醛收率为 3.3% ,当把过氧化氢稀释 ,向反应体系中滴入时 ,则正己醛的收率将大幅度提高 .对于PW11Co来说 ,正己醛的收率提高为 7.12 % ,选择性为 89.4% .还利用ICP ,IR ,UV等手段对催化剂进行了表征     

LaNi_(0.5)M_(0.5)Al_(11)O_(19+δ)催化剂上CH_4和CO_2重整反应的研究

在LaNiAl11O19+δ的基础上 ,制备了一系列磁铅石型复合氧化物LaNi0 .5M0 .5Al11O19+δ(M =Mn ,Fe ,Cu ,Co)催化剂 ,并用XRD和TPR对其结构和性能进行了表征 .结果表明 ,不同M原子均可同晶取代Ni原子进入催化剂晶格内部 ,此系列催化剂均具有相同的晶体结构和相似的还原稳定性 .在CO2 重整CH4 制合成气反应过程中 ,还原态复合氧化物LaNi0 .5Co0 .5Al11O19+δ表现出良好的催化活性和稳定性 ,并且与还原态复合氧化物LaNiAl11O19+δ催化活性相当 .在相同的反应条件下 ,催化活性并没有因为催化剂中Ni量的减少而降低 ,由此推测 ,对于此反应来说 ,仅仅只是一部分的Ni起作用