环梁支撑结构在泥炭土深基坑中的应用研究

以昆明市某超深基坑工程为例,分析探讨了大环梁内支撑结构在深厚泥炭质土层中应用的可行性及变形、应力变化规律。基坑支护结构位移及应力监测结果表明,环形内支撑结构能克服泥炭质土中锚杆锚固力差、易松弛变形等缺点,具有受力性能合理、方便施工且经济等优点,相对于与同类淤泥质软土基坑而言,其变形值相对偏大。本工程的成功经验可供类似基坑工程设计、施工参考。

具杀菌活性的N-取代环十二酮缩氨基硫脲的合成

Eight new title compounds(3a^3h) were synthesized and their structures confirmed by IR, - 1H NMR-, - 13-C NMR and elemental analysis. Preliminary bioassay showed that compounds 3 have some fungicidal activity.

当表面活性剂遇到大环分子

近年来,表面和胶体化学与大环化学的结合引起了科学家的普遍关注。将多样的大环结构引入表面活性剂分子,不仅极大地丰富了表面活性剂分子的种类,还可以赋予其大环的主客体识别功能。由此所开发出的大环两亲和超两亲分子已在生物成像和药物递送中表现出很高的应用潜力。从传统表面活性剂到大环两亲和超两亲分子的发展、应用表明,不同领域的交叉融合对科学研究的发展是非常重要的。

卟啉及其稀土配合物的紫外可见光谱

合成了稀土卟啉配合物-钇卟啉,研究了卟啉及钇卟啉的电子吸收光谱,讨论了溶剂的性质对其电子吸收光谱的影响,实验结果表明:钇卟啉在丙酮和三氯甲烷中的光稳定性最好,是很好的光敏剂。

Numerical simulation of the structure and variation of upwelling off the east coast of Hainan Island using QuikSCAT winds

The spatial structure and variation of the upwelling in the waters east and northeast of Hainan Island, China during 2000-2007 were investigated using a nested high-resolution Princeton Ocean Model (POM) forced by QuikSCAT winds. The model produced good simulations of the summer upwelling and the seasonal and annual variability. Strong upwelling occurs from mid-July to mid-August with a peak east of Hainan Island associated with the southwesterly monsoon in the South China Sea. Sensitivity experiments indicated that when the local wind stress controls the variability of the upwelling, the large-scale circulation significantly enhances the upwelling northeast of Hainan Island by inducing a local upwelling and transporting cold water northeast-ward along the island's east coast. The joint effects of the local wind stress and large-scale circulation result in stronger upwelling northeast of Hainan Island. This implies that the annual variation of the upwelling northeast of Hainan Island is controlled not only by the local alongshore wind stress but also by the large-scale circulation. This result will help us investigate the decadal variation of the upwelling in this region in the future.

The Crystal and Molecular Structure of a New Macrocyclic Ligand, (H_6BDBPH)Br_6·4H_2O

The hexahydro\|bromide salt of a new 24\|membered hexaaza diphenol macrocyclic ligand, （H6BDBPH）Br6·4H2O （C 26H 56N6O6Br6, Mr= 1028.23）, crystallizes in the monoclinic system, space group P21/c, with cell parameters: a=14.441（5）, b=11.482（4）, c=12.090（6）, β=96.92°, V= 1990 （1）3, Z=2, Dc=1.716 g/cm3; F（000） =1024. MoKα radiation, λ= 0.71013), R = 0.0643 and wR = 0.1356 for 3507 independent reflections with I>2σ（I）. The macrocyclic ligand adapts chair form, and the crystallographic inversion center is located in the macrocyclic cavity, and the six bromide ions and four water molecules are situated symmetrically outside the macrocyclic cavity.

Crystal Structure of a Copper(II) Complex with 2,3-Dioxo-5,6:13,14-dibenzo-9-methyl-7,12-bis(ethoxycarbonyl)-1,4,8,11-tetraazacyclotetradeca-7,11-diene

The molecular and crystal structure of a macrocyclic N,N′-substituted- oxamidocopper(II) complex, [CuL], where H2L = 2,3-dioxo-5,6:13,14-dibenzo-9-methyl-7,12- bis(ethoxycarbonyl)-1,4,8,11-tetraazacyclotetradeca-7,11-diene, has been determined by X-ray diffraction method. Crystal data: C25H24CuN4O6, Mr = 540.02, monoclinic, space group C2/c, a = 25.605(4), b = 9.230(2), c = 22.105(4) ?, ( = 111.749(4)(, V = 4852(2) ?3, Z = 8, Dc = 1.478 g/cm3, μ (Mo-K() = 0.949 mm-1, F(000) = 2232, R = 0.0681 and wR = 0.1666 for 2747 observed reflections with I ( 2((I). The copper atom is located in the coordination cavity formed by the four nitrogen donors of the deprotonated macrocyclic oxamido ligand with a distorted square-planar geometry. In the crystal, two molecules are connected by the Cu···O weak coordination bonds to produce a supramolecular quasi-dimer.

Crystal and Molecular Structure of OMPCTF

The title compound C_(28)H_(48)O_4 (M_r=448. 8) crystallizes in the triclinic, space group P1 with a=12. 909(5) , b=10. 422(4) , c=11. 052(4) A, α=108. 35 (3), β=100. 07(3), γ=70. 06(3)°, Z=2, V=1322. 9(8) A￣3,109. D_c=1. 13 gcm￣(-3), F(000)=496, μ(MoKa)=0. 80cm￣(-1). The final R=0. 067 and R_w=0. 074 for 1652 observed independent reflections (I≥3σ(I)). The conformation of the molecule is rather unusual , and there is not any symmetry element involved in it.The four units are different from each other in bond lengths and bond angles. The distances between two separate oxygen atoms are 5. 77 and 4. 25 A, respectively , and those between two adjacent oxygen atoms average 3. 59 A.

Influence of System Uncertainties on Structural Damage Identification through Ambient Vibrations of Steel Structures

The practical difficulties presented by forced vibration testing of large steel structures, such as tall buildings, transmission lines or bridges, led to an increased interest in structural monitoring through ambient vibrations, which usually allows the proper identification of modal properties, natural frequencies, damping and modes of vibration. Changes in these modal properties constitute an indication of structural damage, which may then be assessed on the basis of experimental evidence. The authors proposed an approach to determine the so-called damage damping and stiffness matrices, which are essential to identify the location and intensity of damage. No restrictions were introduced on the damping matrix of the system. The approach requires ambient vibration data of all relevant coordinates used in the structural model, which are processed employing the SSI method. In practice, the identification method is seriously hampered by ambient factors such as temperature or humidity. In general those effects must be filtered out in other to obtain a reliable diagnosis of damage, approach that demands long term monitoring. In this paper, an alternative approach is explored, based on the introduction of error damping and stiffness matrices. Data on both matrices is generated on the basis of observed variations of structural member stiffness and damping caused by ambient factors. The influence of this uncertainty on the identified spectral properties is assessed by simulation.

Quality Management Model Embodying Circular Economy and Sustainable Manufacture - Quality Concept Models Based on a Chinese Traditional Cultural Principle

Based on circular economy and sustainable manufacture theories, the drawbacks in the existing quality management models are analyzed. The requests that satisfy the big system 'environment-society-economy' are summarized to build up a model. A Chinese traditional cultural principle is applied and the relevant contents are sublimated as the platform to set up the model. The new quality management concept models are put forward: 'T-D-R' three dimension structures and 'ecological quality loop' model, from which the new quality concepts are formed. The paper elaborates the contents and the process of setting up the models. The big system quality problems can be handled by the new quality concept and model that are validated in practice.

Density Functional Theory Investigation of Structures and Electronic Spectra of N-protonated Corroles

The geometries and electronic spectra of a series of N-protonated corroles, including unsub- stituted H4Cor＋ and meso-triaryl substituted H4TPC＋, H4TpFPC＋, and H4TdCPC＋, were theoretically studied with density functional theory （DFT）. The results indicate that all these compounds have two conformers, one with C2 symmetry （denoted as Sl） is more stable than the other （denoted as $2, C1 symmetry） by 15.8-18.5 kJ/mol. The corrole macrocycles of these compounds show significant out-of-plane deformation. The enantiomerizations of the chiral S1 conformers were found to be a multi-step process with the $2 conformers as the intermediates. Electronic absorption spectra and electronic circular dichroism （ECD） of these compounds were calculated with time-dependent DFT. In comparison with H4Cor＋, the UV- Vis absorptions of meso-triaryl species are significantly red-shifted and their Q bands are enhanced due to the π-π conjugation between the aryl and corrole rings. Several neighboring electronic transitions were calculated with opposite signs in rotatory strengths, suggesting that ECD spectroscopy may be a useful tool in studying the electronic transitions of these compounds.

Crustal and upper mantle structure and the deep seismogenic environment in the source regions of the Lushan earthquake and the Wenchuan earthquake

Following the M w 7.9 Wenchuan earthquake, the M w 6.6 Lushan earthquake is another devastating earthquake that struck the Longmenshan Fault Zone (LFZ) and caused severe damages. In this study, we collected continuous broadband ambient noise seismic data and earthquake event data from Chinese provincial digital seismic network, and then utilized ambient noise tomography method and receiver function method to obtain high resolution shear wave velocity structure, crustal thickness, and Poisson ratio in the earthquake source region and its surroundings. Based on the tomography images and the receiver function results, we further analyzed the deep seismogenic environment of the LFZ and its neighborhood. We reveal three main findings: (1) There is big contrast of the shear wave velocities across the LFZ. (2) Both the Lushan earthquake and the Wenchuan earthquake occurred in the regions where crustal shear wave velocity and crustal thickness change dramatically. The rupture faults and the aftershock zones are also concentrated in the areas where the lateral gradients of crustal seismic wave speed and crustal thickness change significantly, and the focal depths of the earthquakes are concentrated in the transitional depths where shear wave velocities change dramatically from laterally uniform to laterally non-uniform. (3) The Wenchuan earthquake and its aftershocks occurred in low Poisson ratio region, while the Lushan earthquake sequences are located in high Poisson ratio zone. We proposed that the effect of the dramatic lateral variation of shear wave velocity, and the gravity potential energy differences caused by the big contrast in the topography and the crustal thickness across the LFZ may constitute the seismogenic environment for the strong earthquakes in the LFZ, and the Poisson ratio difference between the rocks in the south and north segments of the Longmenshan Fault zone may explain the 5 years delay of the occurrence of the Lushan earthquake than the Wenchuan earthquake.