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To study the different permeability characteristics of rock, transient permeability tests of limestone and diorite were carried out. The permeability evolution and the relation between pore pressure and time of rock specimens during the complete stress-strain course were investigated. The strain-permeability equations of rock specimens during the deformation and failure course were set up. Finally, the penetration mechanism of two types of rocks was analyzed.
为研究岩石不同渗透特性,对石灰岩和闪长岩进行了瞬态渗透实验,研究了岩样全应力-应变过程中的渗透率演化规律以及孔隙压差与时间的关系,并建立了岩样变形破坏过程的应变-渗透率方程,最后分析了这两种不同类型岩石渗透机理。
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Results 1. For the normal group,20.2%(101/500) specimens were detected positive forHPV infection. 1512 women were included in the abnormal group and 523(34.6%)specimens were detected positive for HPV DNA, including 407(77.8%) one-typeinfection, 82(15.7%) diplex infection and 34(6.5%) multiple infection.
收集宫颈癌组织标本,针对HPV16亚型分别设计L1、E6和E7基因特异性引物,用PCR方法从宫颈癌组织中获得各基因的全长序列,并构建克隆载体pMD18-T,进行序列分析,同时分别以L1、E6和E7基因序列进行进化分析。
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The institute has a collection of over 800,000 specimens, including a number of type specimens in Heteroptera, Diptera and Lepidoptera and some rare species.
本所标本馆拥有采自中国和其它国家的昆虫标本80余万号,其中包括一批半翅目,双翅目和鳞翅目的模式标本以及其它一些珍贵的昆虫种类。
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The stress-strain curves of Cu-Zn-Al alloys at different temperatures have been plotted on the tensile machine with the aid of electrometry. The main results were as follows: 1. When specimens were deformed within the range of M_s and M_d, the critical stress for inducing martensitic transformation increased with the temperature, and there existed a linear relationship between them. 2. When specimens were deformed above Af, complete pseudoelasticity might be obtained theoretically, which might be damaged, h...
在拉力试验机上用电测法测绘了Cu-Zn-Al合金在马氏体相变点上下各温度的σ-ε曲线,所得主要结果如下:(1)试样在M_s与M_d之间加载,随着温度升高,诱发马氏体相变所需临界应力增大,且加载温度与临界应力之间存在着线性关系;(2)在A_f点以上加载,理论上可获得完全的伪弹性,但加载温度过高或应变量过大,均会损害伪弹性;(3)试样在M_s点上下温度区域变形,得到的伪弹性回复和形状记忆回复之和在80%以上,但在M_s点附近总回复量出现一极小值,且伪弹性回复在M_f点以下又有所回升。
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This paper investigates bond and anchor performance of FRP tendons concrete by felting test of 19 symmetrical pull specimens and 9 pull-out specimens.
本文通过19个对拉试件和9个拔出试件的粘结试验,对FRP筋与混凝土的粘结锚固性能做了相应的研究。
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Compared with the graphite, the coefficients of friction of the RL-C/C are lower under the same load of about 0.08-0.12, and the increasing range of the volume losses are still lower than those of the graphite. Compared with the SL pyrocarbon material, the COF and the volume loss of the SL-C/C are about 0.02-0.05 and 0.2 mm^3, lower than those under the same load. The COFs of most RL-C/C and SL-C/C specimens remain stable or decrease slightly with time, while those of the graphite and pyrocarbon specimens increase. The thickness of the integrated friction film of the RL-C/C decreases with load, but the wear surface of the SL-C/C is rough. Tough the wear surface of the graphite is integrated, the serious abrasive wear make the debris move easily and accumulate on the edge of the wear trace to form a restacked morphology. On the wear surface of the pyrocarbon material, some loosed debris, circular worn holes and flake worn out pyrocarbon has been found.
结果表明:PAN炭纤维改善C/C复合材料的摩擦磨损行为;在实验载荷范围内,与高强度石墨材料相比,含RL炭C/C复合材料的摩擦因数降低0.08~0.12;体积磨损量增幅降低;与热解炭试样相比,具有SL炭C/C复合材料的摩擦因数降低0.02~0.05,体积磨损量低0.2立方公厘左右;随着时间的延长,大部分C/C复合材料的摩擦因数基本相对稳定或呈小幅下降,而石墨、热解炭块的摩擦因数均呈不同幅度的上升;具有RL炭的C/C复合材料摩擦表面膜厚度随载荷增加而降低,具有SL炭的C/C复合材料摩擦表面较粗糙;高强石墨能形成较完整致密的摩擦膜,但磨粒磨损严重,磨屑易在摩擦膜边缘形成层状堆积;热解炭块摩擦表面磨屑堆积松散,有较多的孔洞以及热解炭层整体剥落的形貌。
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Compared with the graphite, the coefficients of friction of the RL-C/C are lower under the same load of about 0.080.12, and the increasing range of the volume losses are still lower than those of the graphite. Compared with the SL pyrocarbon material, the COF and the volume loss of the SL-C/C are about 0.020.05 and 0.2 mm3, lower than those under the same load. The COFs of most RL-C/C and SL-C/C specimens remain stable or decrease slightly with time, while those of the graphite and pyrocarbon specimens increase. The thickness of the integrated friction film of the RL-C/C decreases with load, but the wear surface of the SL-C/C is rough. Tough the wear surface of the graphite is integrated, the serious abrasive wear make the debris move easily and accumulate on the edge of the wear trace to form a restacked morphology. On the wear surface of the pyrocarbon material, some loosed debris, circular worn holes and flake worn out pyrocarbon has been found.
结果表明:PAN炭纤维改善C/C复合材料的摩擦磨损行为;在实验载荷范围内,与高强度石墨材料相比,含RL炭C/C复合材料的摩擦因数降低0.08~0.12;体积磨损量增幅降低;与热解炭试样相比,具有SL炭C/C复合材料的摩擦因数降低0.02~0.05,体积磨损量低0.2 mm3左右;随着时间的延长,大部分C/C复合材料的摩擦因数基本相对稳定或呈小幅下降,而石墨、热解炭块的摩擦因数均呈不同幅度的上升;具有RL炭的C/C复合材料摩擦表面膜厚度随载荷增加而降低,具有SL炭的C/C复合材料摩擦表面较粗糙;高强石墨能形成较完整致密的摩擦膜,但磨粒磨损严重,磨屑易在摩擦膜边缘形成层状堆积;热解炭块摩擦表面磨屑堆积松散,有较多的孔洞以及热解炭层整体剥落的形貌。
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Further morphological observations were performed on the holotype of Leptobotia zebra and other specimens including formalin-fixed museum specimens and newly collected alcohol-fixed ones.
系统发育分析发现斑纹薄鳅并未和薄鳅属的物种聚在一起,而是和中华沙鳅属物种美丽沙鳅聚在一起形成姐妹群。
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Instead of calling on some scholar, I paid many a visit to particular trees, of kinds which are rare in this neighborhood, standing far away in the middle of some pasture, or in the depths of a wood or swamp, or on a hilltop; such as the black birch, of which we have some handsome specimens two feet in diameter; its cousin, the yellow birch, with its loose golden vest, perfumed like the first; the beech, which has so neat a bole and beautifully lichen-painted, perfect in all its details, of which, excepting scattered specimens, I know but one small grove of sizable trees left in the township, supposed by some to have been planted by the pigeons that were once baited with beechnuts near by; it is worth the while to see the silver grain sparkle when you split this wood; the bass; the hornbeam; the Celtis occidentalis, or false elm, of which we have but one well-grown;some taller mast of a pine, a shingle tree, or a more perfect hemlock than usual, standing like a pagoda in the midst of the woods; and many others I could mention.
我并没有去访问哪个学者,我访问了一棵棵树,访问了在附近一带也是稀有的林木,它们或远远地耸立在牧场的中央,或长在森林、沼泽的深处,或在小山的顶上;譬如黑桦木,我就看到一些好标本,直径有两英尺:还有它们的表亲黄桦木,宽弛地穿着金袍,像前述的那种一样地散发香味,又如山毛榉,有这样清洁的树干,美丽地绘着苔藓之色,处处美妙呵,除了一些散在各地的样本,在这乡镇一带,我只知道有一个这样的小小的林子,树身已相当大了,据说还是一些被附近山毛榉的果实吸引来的鸽子播下的种子;当你劈开树木的时候,银色的细粒网闪发光,真值得鉴赏;还有,椴树,角树;还有学名为Celtis occidenta lis的假榆树,那就只有一棵是长得好的;还有,可以作挺拔的桅杆用的高高的松树,以及作木瓦用的树;还有比一般松树更美妙的我们的铁杉,像一座宝塔一样矗立在森林中;还有我能提出的许多别的树。
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Preparation and collection of specimens: To kill the rabbits at different time and collect the specimens for pathology, electron microscope, RT-PCR and orthotopic hybridism in situ.
标本留取:分别于术后第2、4周处死假手术组大白兔各2只,于术后即刻随机处死对照组和通心络组大白兔各2只,损伤后3天、1周、2周、4周和6周随机处死对照组和通心络组大白兔各4只,分别留取病理、电镜、逆转录-聚合酶链式反应和原位杂交试验标本。
- 推荐网络例句
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Mr. Putin said there were signs of genocide against the Ossetian people.
普京说,有迹象表明对南奥塞梯人进行了种族清洗。
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What I'm trying to say, Tristan is...
特瑞斯坦。我想说的是。
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Petersen largely pays attention to nanotech, but she also draws connections between technology and how it's used.
Petersen的注意力主要放在纳米技术上,不过她也研究技术与如何使用之间的联系。