混凝土理石面施工技术

结合实例 ,针对混凝土外观质量通病 ,介绍为使混凝土表面达到理石面效果而进行模板选型、脱模剂、接缝处理。

Anisotropic surface broken bond properties and wettability of calcite and fluorite crystals

Anisotropic surface broken bond densities of six different surfaces of calcite and three surfaces of fluorite were calculated. In terms of the calculated results, the commonly exposed surfaces of the two minerals were predicted and the relations between surface broken bonds densities and surface energies were analyzed. Then the anisotropic wettability of the commonly exposed surfaces was studied by means of contact angle measurement. The calculation results show that the （101^-4）, （213^-4）and （01 1^-8）surfaces for calcite and （111） for fluorite are the most commonly exposed surfaces and there is a good rectilinear relation between surface broken bond density and surface energy with correlation of determination （R^2） of 0.9613 and 0.9969, respectively. The anisotropic wettability of different surfaces after immersing in distilled water and sodium oleate solutions at different concentrations can be explained by anisotropic surface broken bond densities and active Ca sites densities, respectively.

破折号的用法

英语中常用到破折号,现就破折号的用法简述如下.用在解释性的分句之前和解释性的插入语前后,相当于一个括号的作用,如:

Effect of heat treatment on microstructure and thermophysical properties of diamond/2024 Al composites

50%diamond particle （5μm） reinforced 2024 aluminum matrix （diamond/2024 Al） composites were prepared by pressure infiltration method. Diamond particles were distributed uniformly without any particle clustering, and no apparent porosities or significant casting defects were observed in the composites. The diamond-Al interfaces of as-cast and annealed diamond/2024 Al composites were clean, smooth and free from interfacial reaction product. However, a large number of Al2Cu precipitates were found at diamond-Al interface after aging treatment. Moreover, needle-shaped Al2MgCu precipitates in Al matrix were observed after aging treatment. The coefficient of thermal expansion （CTE） of diamond/2024 Al composites was about 8.5×10-6 °C-1 between 20 and 100 °C, which was compatible with that with chip materials. Annealing treatment showed little effect on thermal expansion behavior, and aging treatment could further decrease the CTE of the composites. The thermal conductivity of obtained diamond/2024 Al composites was about 100 W/（m？K）, and it was slightly increased after annealing while decreased after aging treatment.

前进中的西大街小学

在汉阳区古城西门外的一条小街上.现在仍依稀可见昔年风貌,由一座残破道观改建的西大街小学展现出80年代英姿。那镶嵌着大理石面的校门,悬挂着猩红耀眼的市文明单位光荣匾和学校校牌。

Mineral cleavage nature and surface energy: Anisotropic surface broken bonds consideration

The population of surface broken bonds of some typical sulfide, oxide and salt-type minerals which may belong to cubic, tetragonal, hexagonal, or orthorhombic system, were calculated. In terms of the calculation results, the cleavage natures of these minerals were analyzed, and the relationship between surface broken bonds density and surface energy was also established. The results show that the surface broken bonds properties could be used to predict the cleavage nature of most of minerals, and the predicted cleavage planes agree well with those reported in previous literature. Moreover, this work explored a rule that, surface broken bonds density is directly related to surface energy with determination coefficient（R2） of over 0.8, indicating that the former is a dominant factor to determine the latter. Therefore, anisotropic surface broken bonds density can be used to predict the stability of mineral surface and the reactivity of surface atoms.

西班牙散记之五

西班牙历史的轨迹 今日休息,我们去马德里东部的塞尔维亚市旅游,这里有闻名两千多年的输水渡槽,有菲利浦五世的夏宫,有十八世纪的古堡,有巨大的天主教教堂,这些著名建筑详细记载着西班牙历史的发展。这块块基石、座座宫殿在向游人展示着西班牙光辉的文化。 塞尔维亚地处马德里以东一百多公里,是有5万多居民的旅游城市,以闻名于世的古迹吸引来大批的游客,整座城市也以旅游业及与之配套的商业为主。 罗马大渡槽建于2008年之前,工程之浩大是当代人也为之惊奇的。

卫生洁具 日新月异

卫生洁具的竞争向来激烈,世界各种品牌至今仍难分胜负。因为,一些名气颇大的生产厂家,产品更新快,今天推出一种新产品,明天又变换出另一种款式。 具有代表性的美国洁具,在此方面,表现令人关注。在纽约、新泽西、费城、华盛顿地区的一些卫生陶瓷洁具专卖店,人们看到的洁具是:品种多、款式新、颜色雅。

Degradation of joint surface morphology, shear behavior and closure characteristics during cyclic loading

In order to investigate the failure mechanism of rock joint,a series of laboratory tests including cyclic direct shear tests under constant normal load(CNL)conditions were conducted.Morphology parameters of the rock joint surface were precisely calculated by means of a three-dimensional laser scanning machine.All test results were analyzed to investigate the shear behavior and normal displacement behavior of rock joints under CNL conditions.Degradation of rock joint surface during cyclic shear tests was also analyzed.The comparison results of the height parameters and the hybrid parameters of the joint surface during cyclic tests show that the degradation of the surface mostly happens in the first shear and the constant normal loads imposed on the joints have significant promotion effects on the morphology degradation.During cyclic shear tests,joints surfaces evolve from rough state to smooth state but keep an overall undulation.Dilatancy of rock joints degrades with the degradation of joint surface and the increase of normal loads.The closure deformation of joint is larger than that of the intact rock,and the normal stiffness increases with the increase of shearing times.

The Effect of Coupling Agents on Natural Zeolite-Filled Natural Rubber

Natural zeolite particles of 40, 80 and I00 phr were incorporated into natural rubber （NR） using a two-roll mill. The surface treatment of zeolite particles was expected to improve their cure characteristics and their tensile properties. Two types of silane coupling agents, i.e., bis-[3-（triethoxysilyl）-propyl]-tetrasulfide （Coupling 89） and 3-Octanoylthio-l-propyltriethoxysilane （NXT） at various loadings of 2, 4 and 8 percent by weight （%wt） were selected. The viscosity and cure time of the rubber compound increased, while the scorch time decreased after the treatment of zeolite by both coupling agents. The viscosity of the rubber compound predominantly increased when increasing Coupling 89, however, NXT loadings showed no significant effect on the cure characteristics Moreover, the amount and type of coupling agent influenced the tensile properties of the vulcanizates, as a result of the increase in tensile strength, and tensile modulus with increasing both coupling agents loading. The tensile properties of the vulcanizates increased at low Coupling 89 concentrations （2-4%wt）, but decreased at high Coupling 89 loading （8%wt）. Since NXT has a less bulky structure and lower viscosity compared with Coupling 89, it thus reacts with the silanol groups on the zeolite surface more readily, resulting in the decrease in filler-filler interaction, leading to better tensile properties.

Characterization of foreign grain on 6H-SiC facet

6H-SiC single crystals were grown by sublimation method. It is found that foreign grains occur frequently on the facets of the crystals. To characterize the foreign grain, a longitudinal and a sectional cut samples were prepared by standard mechanical processing method. Raman spectrum confirms that the foreign grain is actually a mis-oriented 6H-SiC grain. The surface structure of the foreign grain was studied by chemical etching and optical microscopy. It is shown that etch pits in foreign grain region take the shape of isosceles triangle, which are different from those in mono-crystalline region, and high density stacking faults are observed on the surface of the foreign grain. The orientation of foreign grain surface is determined to be （10]-4） plane by back-scattering X-ray Laue image. The X-ray powder diffraction reveals that the powder is partly graphitized after a long crystal growth rim. Therefore it is believed that the loss of Si results in the formation of C inclusions, which is responsible for the nucleation of foreign grain in the facet region.

婉约西塘

去西塘时一直下雨,我投宿在一家家庭旅馆,据说是一户明代大户人家的私宅。我选择了最里面的一个房间,那是当年小姐的闺房。雕花的木床,床边框的光滑可鉴,大理石面的旧式梳妆台,虽然镜子有些破损,却并不妨碍它的精致与优雅。卸下行李,稍作休整后,我决定去看一看夜晚的廊棚。关于廊棚的起源,有两个传说。

从未抵达

一夕阳淡淡的余晖透过落地窗,均匀地铺洒在入口处冰凉的黑色大理石面上,泛着微微的光。又是一个慵懒的傍晚时分,我走出图书馆。凉风渐起,枝头的片片浅黄色的新叶轻轻颤动着。他不在。我暗笑习惯的捉弄,这是多么相似的时刻。满眼的景色静默着。他不在。又是一年初春时分了。

Effect of a comprehensive therapy plus Gushenyutai plaster administered at Guanyuan(CV 4) on male infertility associated with semen non-liquefaction

OBJECTIVE: To observe the clinical effect of Gushenyutai plaster administered at the Guanyuan(CV4) acupoint on male infertility associated with semen non-liquefaction.METHODS: Sixty-two male patients with infertility caused by semen non-liquefaction were random-ized into a treatment and control group. The control group received comprehensive therapy, which included oral administration of clarithromycin sustained release tablets, hip bath with Zhongyaoxiaoyan granules, prostate massage, and transurethral microwave treatment. The treatment group was administered Gushenyutai plaster in addition to the comprehensive therapy. Both groups were treated for 8 weeks. After treatment, the clinical effect and pregnancy rate were assessed and compared between the two groups.RESULTS: The effective rate of the treatment group was significantly higher than that of the control group(96.77% vs 70.97%, P<0.05) and the pregnancy rates of the treatment group and control groups were 38.71% and 16.13%, respectively(P<0.05).CONCLUSION: The effect of Gushenyutai plaster plus comprehensive therapy was better than that of the comprehensive therapy alone on male infertility induced by semen non-liquefaction.

Predicting crest settlement in concrete face rockfill dams using adaptive neuro-fuzzy inference system and gene expression programming intelligent methods

This paper deals with the estimation of crest settlement in a concrete face rockfill dam （CFRD）, utilizing intelligent methods. Following completion of dam construction, considerable movements of the crest and the body of the dam can develop during the first impoundment of the reservoir. Although there is vast experience worldwide in CFRD design and construction, few accurate experimental relationships are available to predict the settlement in CFRD. The goal is to advance the development of intelligent methods to estimate the subsidence of dams at the design stage. Due to dam zonifieation and uncertainties in material properties, these methods appear to be the appropriate choice. In this study, the crest settlement behavior of CFRDs is analyzed based on compiled data of 24 CFRDs constructed during recent years around the world, along with the utilization of gene ex- pression programming （GEP） and adaptive neuro-fuzzy inference system （ANFIS） methods. In addition, dam height （H）, shape factor （St）, and time （t, time after first operation） are also assessed, being considered major factors in predicting the settlement behavior. From the relationships proposed, the values ofR2 for both equations of GEP （with and without constant） were 0.9603 and 0.9734, and for the three approaches of ANFIS （grid partitioning （GP）, subtractive clustering method （SCM）, and fuzzy c-means clustering （FCM）） were 0.9693, 0.8657, and 0.8848, respectively. The obtained results indicate that the overall behavior evaluated by this approach is consistent with the measured data of other CFRDs.

Field emission characteristics of nano-diamond cathode surface by graphitization pretreatment

Cathode samples of nano-diamond by graphitization pretreatment with different temperatures were fabricated by electrophoresis, then the structures and morphologies of the cathode samples were characterized by scanning electron microscope(SEM) and X-ray diffraction(XRD), and the field emission tests were conducted. The effects of graphitization pretreatment on the field emission characteristics of nano-diamond cathode surface on titanium substrate are studied. The results indicate that the surface morphologies of nano-diamond cathode samples after graphitization pretreatment change a lot, and the field emission characteristics in low-voltage area are improved obviously. However, in high-voltage area, the curve distortion happens, and it doesn't conform the mechanism of field emission characteristics.

Thermography analyses of rock fracture due to excavation and overloading for tunnel in 30° inclined strata

Large-scale physical model test of 30°inclined strata was conducted to investigate the damage mechanisms during the excavation and overloading using infrared detection.The experiment results were presented with thermal images which were divided into three stages including a full face excavation stage,a staged excavation stage,and an overloading stage.The obtained results were compared with the previously reported results from horizontal,45?,60?,and vertical strata models.Infrared temperature(IRT)for 30°inclined strata model descended with multiple fluctuations during the full-face excavation.For the staged excavation,the excavation damage zone(EDZ)showed enhanced faulting-like strips as compared in the 45?,60?,and vertical models,indicating the intensified stress redistribution occurred in the adjacent rock mass.In contrast,EDZ for the horizontal strata existed in a plastic-formed manner.During the overloading,abnormal features in the thermal images were observed preceding the coalescence of the propagating cracks.The ultimate failure of the model was due primarily to the floor heave and the roof fall.