城市综合体供电方案及系统的比选

介绍了影响城市综合体供电方案和系统的主要因素,列举选择供电方案和供电系统的依据。指出综合体在工程设计中应从实际需求出发,制定切实可行的供电方案及系统。案例分析结果表明,在不同的地区、完全相同的公寓式办公建筑因供电局的要求不同,其低压系统及计量方式不同。     

级联复合腔对光纤激光模式的抑制影响

提出了一种复合腔结构的稳定单纵模(SLM)掺铒光纤激光器,其复合腔结构由主环形有源腔和两个次级无源腔组成。在光纤环形镜中嵌入未抽运的掺铒光纤作为可饱和吸收体以抑制多纵模,用光纤环谐振腔作为滤波器抑制拍频噪声,用光纤光栅作为波长选择器件,最终得到了单纵模输出并消除了拍频噪声。在整个波长调节范围内边模抑制比大于50dB,当泵浦功率为80mW时,掺铒光纤激光器输出功率为20.51mW,激光器的输出很稳定,在25min的观察时间内,输出功率的变化小于0.02%,实现了稳定的激光功率输出。     

轴对称荷载下加筋碟形薄壳的近似计算

对于承受轴对称荷载的加筋碟形薄壳,壳体内力可分为薄膜应力和弯曲应力,可以先把筋条按某种准则“均摊”在壳体上,从而用有效薄膜厚度和有效抗弯厚度来分别代替壳体厚度,再分别利用含待定复系数的旋转薄壳复变量方程,递推代换求解薄壳的薄膜解;以及利用幂指数摄动级数近似法求解薄壳的抗弯解;并通过环壳球壳交接处的协调条件以及边界条件,联立求解薄壳复变量方程中未知的待定复系数,从而使问题得以解决.     

Uncovering Hierarchical Regulation among MYB-bHLH-WD40 Proteins and Manipulating Anthocyanin Pigmentation in Rice

Anthocyanins accumulate in various organs of rice, and the regulatory genes involved in pigmentation of specific organs, such as pericarp, hull, leaf, apiculus, and stigma have been elucidated. However, the corresponding gene for rice culm pigmentation has not been clarified. The well-known MYB-bHLH-WD40 (MBW) complex plays vital role in regulating the anthocyanin biosynthesis pathway in plants. However, the core members of MBW and the hierarchical regulation between these members are not fully elucidated in rice. Here, by map-based cloning, we identified the culm-specific pigmentation gene S1 whose alleles are also known for hull/pericarp pigmentation. We also clarified that one WD40 protein encoding gene, WA1, is indispensable for anthocyanin biosynthesis in rice. In the cascading regulation among MBW members, S1 (bHLH) acts as the master gene by activating the expression of C1 (MYB), and then C1 activates the expression of WA1 (WD40), which is unique in plant species. This enables MBW members to be coordinated in a common way to efficiently regulate anthocyanin biosynthesis genes. Based on these studies, we explored the minimal gene set required for anthocyanin biosynthesis in rice. These findings will help us design new rice varieties with anthocyanin accumulation in specific organs as needed.     

Halochromic Behavior and Anticancer Effect of New Synthetic Anthocyanidins Complexed with β-Cyclodextrin Derivatives

Anthocyanidins, the aglycons of anthocyanins, are known, beyond their function in plants, also as compounds with a wide range of biological and pharmacological activities, including cytostatic effect against various cancer cells. The nature and position of the substituents in the flavylium cation is essential for such biological properties, as well as the equilibrium between the multistate of the different chemical species that are generated by the flavylium cation, including quinoidal base, hemiketal, and cis- and trans-chalcones. In this work, eight new flavylium derivatives were synthesized, characterized for confirmation of the structure by FT-IR and 2D-NMR, and investigated in vitro as possible cytostatic compounds against HCT116 and HepG2 cancer cells. The most active two compounds were explored for their halochromic properties that can influence the biological activity and subjected to molecular encapsulation in β-cyclodextrin derivatives in order to increase their solubility in water and bioavailability. The anticancer effect was influenced by the position (6-, 7-, or 8-) of the methoxy group in the β-ring of the methoxy-4′-hydroxy-3′-methoxyflavylium cation, while the study of the halochromic properties revealed the important role played by the chalcone species of the pH-dependent multistate in both the uncomplexed and inclusion complex forms of these anthocyanidins.     

NO分解催化剂Cu/分子筛的ESR研究 Ⅰ.水合铜分子筛的ESR研究

系统地比较了在各种不同制备条件下制得的Ｃｕ／ＺＳＭ－５、Ｃｕ／丝光沸石、Ｃｕ／镁碱沸石和Ｃｕ／毛沸石的ＥＳＲ谱，至少六种水合Ｃｕ物种被发现，而且发现分子筛的腔结构对Ｃｕ物种的存在状态有很大的影响。     

刚性弹丸对多层复合靶的侵彻分析

本文研究了刚性球形弹丸对间隔靶或多层靶的侵彻问题,这些靶由不同的材料构成.给出了弹丸与靶体相互作用的模型,由它计算出了相互作用的表面在每个时间增量时的变化状态,从而可获得靶的阻力,将这些代入到弹丸的运动方程中,即可得到一个完整的弹丸在击穿靶或未击穿靶时的弹道轨迹.其中靶的阻力从广义的Poncelet方程中求得.这样,经典的静力学和动力系数与靶的材料特性就通过弹腔扩张模型联系起来,所得到的实验结果与计算的穿透结果吻合的较好.     

砷酸根及铬酸根在低聚合羟基铁-蒙脱石复合体表面的竞争吸附

在模拟氧化及酸性土壤条件下,用制备的低聚合羟基铁-蒙脱石复合体进行了砷酸根、铬酸根离子的竞争吸附实验,研究了砷酸根离子和铬酸根离子不同用量及不同添加顺序对竞争吸附的影响,并与蒙脱石和含水氧化铁进行了对比。结果表明,低聚合羟基铁-蒙脱石复合体对砷酸根及铬酸根离子有不同的吸附能力,但在实验条件下砷酸根及铬酸根离子在低聚合羟基铁-蒙脱石复合体表面不发生竞争吸附。砷酸根和铬酸根的吸附顺序对其吸附量有一定的影响。竞争吸附实验的砷酸根、铬酸根吸附量均高于对其单阴离子的吸附量,此现象在复合体表面最为明显,说明复合体具有独特的阴离子吸附性能。

     

Application of strength reduction method to dynamic anti-sliding stability analysis of high gravity dam with complex dam foundation

Considering that there are some limitations in analyzing the anti-sliding seismic stability of dam-foundation systems with the traditional pseudo-static method and response spectrum method,the dynamic strength reduction method was used to study the deep anti-sliding stability of a high gravity dam with a complex dam foundation in response to strong earthquake-induced ground action.Based on static anti-sliding stability analysis of the dam foundation undertaken by decreasing the shear strength parameters of ...