多道HCN激光干涉仪在HL－1装置上的电子密度分布测量

本文描述了为测量ＨＬ－１装置电子密度分布而研制的多道远红外（ＦＩＲ）激光干涉仪系统及其特点。首次对装置在弹丸加料以及拉瓦尔（Ｌａｖａｌ）超声分子束注入实验条件下的等离子体电子密度时－空分布进行了观测和初步分析。同时，介绍一种处理密度相移信号的新方法。     

The number of smallest knots on the cubic lattice

It has been shown that the smallest knots on the cubic lattice are all trefoils of length 24. In this paper, we show that the number of such unrooted knots on the cubic lattice is 3496.     

水坝在水流作用下动力响应的一种分析方法

以广东某水坝为研究对象,给出一种基于Fluent平台和Ansys平台进行结构动力响应分析的方法。首先采用基于YOUNGS界面重构技术的VOF模型,对流动进行数值模拟,成功捕捉了闸门开启过程中自由面的变化,比较了在三种落差情况下水坝的受力差异。计算表明,即使在上游平稳的入流条件下,水坝所受到的湍流水压力也会出现波动现象,水压力对坝体的冲击为低频作用,下游水位的升高会减缓水压力的波动,这些特点都与现场观察的相符。然后将水动力作为激励条件导入结构动力分析平台Ansys后,进一步对坝体结构进行动力分析。结构的模态分析结果与实测结果一致。因此,方法可以应用于实际。     

Fluorescence energy transfer-based multiplexed hybridization assay using gold nanoparticles and quantum dot conjugates on photonic crystal beads

A multiplexed assay strategy was developed for the detection of nucleic acid hybridization. It is based on fluorescence resonance energy transfer (FRET) between gold nanoparticles (AuNPs) and multi-sized quantum dots (QDs) deposited on the surface of silica photonic crystal beads (SPCBs). The SPCBs were first coated with a three-layer primer film formed by the alternating adsorption of poly(allylamine hydrochloride) and poly(sodium 4-styrensulfonate). Probe DNA sequences were then covalently attached to the carboxy groups at the surface of the QD-coated SPCBs. On addition of DNA-AuNPs and hybridization, the fluorescence of the donor QDs is quenched because of the close proximity of the AuNPs. However, the addition of target DNA causes a recovery of the fluorescence of the QD-coated SPCBs, thus enabling the quantitative assay of hybridized DNA. Compared to fluorescent dyes acting as acceptors, the use of AuNPs results in much higher quenching efficiency. The multiplexed assay displays a wide linear range, high sensitivity, and very little cross-reactivity. This work, where such SPCBs are used for the first time in a FRET assay, is deemed to present a new and viable approach towards high-throughput multiplexed gene assays.

Hydrogen-bonding interaction of urea with DNA bases: A density functional theory study

This work deals with the interaction between urea and DNA bases (adenine, thymine, guanine, and cytosine). The optimized geometries, binding energies, and harmonic vibrational frequencies are calculated using the DFT/B3LYP functional combined with the 6–31+G(d,p) basis set. Their interactions are studied aiming to understand more about the nature of the intercalation binding forces between urea and DNA. Fourteen stable complexes are found on the potential energy surface. The structures are cyclic; they are stabilized by NH...O/N and CH...O interactions. The binding energies range from −19.9 kJ·mol⁻¹ to −74.0 kJ·mol⁻¹. The obtained formation energies indicate that Urea:G and Urea:C are more favorable than Urea:T and Urea:A. In addition, the Atoms in Molecules theory is performed to study the hydrogen bonds in the complexes.     

无溶剂合成1,3,5-三芳基-2-芳酰基环己醇衍生物和晶体结构

在NaOH存在下室温研磨查尔酮与丙二腈,可以有效地得到1,3,5-三芳基-2-芳酰基环己醇衍生物,本合成方法反应时间短、操作简单、产率高,符合绿色化学特点.产物结构经过红外、核磁、元素分析和高分辨质谱确证,并对3b做了单晶衍射测定.     

On <Emphasis Type="Italic">s</Emphasis>-Elementary Super Frame Wavelets and Their Path-Connectedness

A super wavelet of length n is an n-tuple (ψ ₁,ψ ₂,…,ψ _n ) in the product space \(\prod_{j=1}^{n} L^{2}(\mathbb{R})\), such that the coordinated dilates of all its coordinated translates form an orthonormal basis for \(\prod_{j=1}^{n} L^{2} (\mathbb{R})\). This concept is generalized to the so-called super frame wavelets, super tight frame wavelets and super normalized tight frame wavelets (or super Parseval frame wavelets), namely an n-tuple (η ₁,η ₂,…,η _n ) in \(\prod_{j=1}^{n}L^{2} (\mathbb{R})\) such that the coordinated dilates of all its coordinated translates form a frame, a tight frame, or a normalized tight frame for \(\prod_{j=1}^{n} L^{2}(\mathbb{R})\). In this paper, we study the super frame wavelets and the super tight frame wavelets whose Fourier transforms are defined by set theoretical functions (called s-elementary frame wavelets). An m-tuple of sets (E ₁,E ₂,…,E _m ) is said to be τ-disjoint if the E _j ’s are pair-wise disjoint under the 2π-translations. We prove that a τ-disjoint m-tuple (E ₁,E ₂,…,E _m ) of frame sets (i.e., η _j defined by \(\widehat{\eta_{j}}=\frac{1}{\sqrt{2\pi}}\chi_{E_{j}}\) is a frame wavelet for L ²(?) for each j) lead to a super frame wavelet (η ₁,η ₂,…,η _m ) for \(\prod_{j=1}^{m} L^{2} (\mathbb{R})\) where \(\widehat{\eta_{j}}=\frac{1}{\sqrt{2\pi}}\chi_{E_{j}}\). In the case of super tight frame wavelets, we prove that (η ₁,η ₂,…,η _m ), defined by \(\widehat{\eta_{j}}=\frac{1}{\sqrt{2\pi}}\chi_{E_{j}}\), is a super tight frame wavelet for ∏_1≤j≤m L ²(?) with frame bound k ₀ if and only if each η _j is a tight frame wavelet for L ²(?) with frame bound k ₀ and that (E ₁,E ₂,…,E _m ) is τ-disjoint. Denote the set of all τ-disjoint s-elementary super frame wavelets for ∏_1≤j≤m L ²(?) by \(\mathfrak{S}(m)\) and the set of all s-elementary super tight frame wavelets (with the same frame bound k ₀) for ∏_1≤j≤m L ²(?) by \(\mathfrak{S}^{k_{0}}(m)\). We further prove that \(\mathfrak{S}(m)\) and \(\mathfrak{S}^{k_{0}}(m)\) are both path-connected under the ∏_1≤j≤m L ²(?) norm, for any given positive integers m and k ₀.     

重组家蚕核多角体病毒（rBmNPV）的复制及所载HuIFN－α基因的表达

报道了重组家蚕核多角体病毒（ＢｏｍｂｙｘｍｏｒｉｎｕｃｌｅａｒＰｏｌｙｈｅｄｒｏｓｉｓＶｉｒｕｓＢｍＮＰＶ）在家蚕细胞ＢｍＮ中复制的细胞病理学变化，除了不形成多角体以外，与野生型病毒相同．研究了病毒感染复数、细胞接种密度和细胞生长阶段对重组病毒复制和α－干扰素（ＩＦＮ－α）表达量的影响．在一定低感染复数时，α－干扰素的产量较高．对于重组病毒的复制，最适的细胞接种密度为３．６～７．０×１０５细胞／瓶．在细胞指数生长前期（４８～６０ｈ）接种重组病毒，对于获得较高的重组病毒复制效价和α－干扰素的产量都是有利的．     

3一致 C-超图的最小边数

混合超图是含有两类超边的超图,一类称为C-超边,一类称为D-超边,它们的区别主要体现在染色要求上．混合超图的染色,要求每一C-超边至少有两个点染相同的颜色,而每一D-超边至少有两个点染不同的颜色．所用的最大颜色数称为对应混合超图的上色数,所用的最小颜色数称为对应混合超图的下色数．上、下色数与边数有密切关系．作者在文献[2]中证明了具有最小上色数的3一致C-超图边数的一个下界为‘n(n-2)/3’,其中n为对应混合超图的顶点数．该文证明当n=2k 1时,该下界是可以达到的．