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1.
水镁石纤维是天然产出的、罕见的高镁实心纤维。其抗拉强度为95×9.81×10 ̄6Pa,弹性模量为1.5~2.0×9.8×10 ̄9pa,显微硬度为70~240,密度为2.44~2.48g/cm ̄3。电阻率为3×10 ̄5Ω.m~6.1×10 ̄7Ω.m,介电常数为4.7~7.2,磁化系数为11.5~15.5cm ̄3/g。耐热区间为450~480℃,导热系数为0.131w/m·k,热膨胀系数为5.7~8.8×10 ̄(-7)m/℃,热容为1.26I/g,热解焓为19.6KJ/mol。Ne=1.575~1.577,No=1.552~1.556,白度73.5%。本文还讨论了上述物理性质的各种变化、影响因素及其应用。  相似文献   

2.
对阿坝州气候生态环境与牛的种群分布进行了探讨,确定牦牛、普通牛适宜气候区的综合气候指标分别为:年均气温0.7~12.2℃,年≥0℃积温为1432.2~4448,年辐射总量122.9~147.9kJ/cm ̄2,年日照时数为2129.7~2417.9h,年降水量≥610mm,生长季干燥度0.094~1.056,隶尾度: =1;年均气温9.0~13.5℃,年≥0℃,积温为3362—1892,年辐射总量101~110.4KJ/cm ̄2,年日照时数为1637.5~1743.7h,年降水量492.7~830mm,生长季干燥度0.574~1.421,隶属度=0.两者之间为牦牛、普通牛过度气候生态区,其气候指标为年均气温4.7~5.7℃,年≥0℃积温2131~2396,年辐射总量115.6~121.9KJ/cm ̄2,年日照时数为1827.5~1843.9h,年降水量729.7~756.1mm,生长季干燥度0.216~0.355,隶属度=0.061~0.225,为充分利用气候资源和牛的品种资源,发展阿坝州养牛业提供了理论依据。  相似文献   

3.
几种因素对太平洋纺锤水蚤摄食率的影响   总被引:16,自引:0,他引:16  
于 1993 年 3~6 月对厦门港浮游桡足类优势种太平洋纺锤水蚤( Acartia pacifica Steuer)的摄食率及其与温度、盐度、食物浓度、食物种类、饥俄、食性等因素的关系进行了研究,为太平洋纺锤水蚤的生态和人工培养研究提供重要理论依据.结果表明:1)太平洋纺锤水蚤对三角褐指藻( Phaeodactylum tricornutum )的清滤率( F, m L/ind·h)和滤食率( G, cells/ind·h)受温度的影响显著, F 和 G 随温度(10~25 ℃)升高而增加,但温度达到或超过 30℃反而因不适应而降低,最适摄食温度在 25 ℃左右( F 和 G 分别为0.058 和 9.33×104).2)盐度对 F 和 G 也有显著影响, F 和 G 随盐度(13~26)升高而增加,但盐度达到或超过 30~32,反而降低,最适摄食盐度在 26 左右( F 和 G分别为 0.030 和 4.37×104 ).3)食物浓度从 6.22×105 升高至 1.00×107 cells/m L, F 有降低趋势,而 G 则有升高趋势;最大 F 和 G 分别为 0.03 和 11.37×104 cells/ind·h.4)太平洋纺锤水蚤对 9 种常见藻类的  相似文献   

4.
R22饱和蒸气在水平双侧强化管外凝结换热的实验研究   总被引:4,自引:0,他引:4  
对氟里昂制冷工质R22在水平单管外的凝结换热性能进行了实验研究.传热管分别采用光管、低肋管及6根不同几何参数的双侧强化高效传热管.试验结果表明:强化管内侧强化换热效果为光管的2倍左右,管外凝结换热系数是光管的5~7倍.在冷凝温度为40℃、管内冷却水流速范围为0.5~3.2m/s时,各强化管总的传热系数是低肋管的1~2倍,是光管的4~6倍  相似文献   

5.
对自制的多孔性金属薄层的泡核沸腾传热特性进行研究.试验采用单管沸腾装置,管内使水沸腾汽化,管外用电加热.在试验的温差下,多孔覆盖层表面的沸腾传热膜系数为光滑表面的2.22倍,泡核沸腾起始温差从3.9℃降至2.1℃.作者还分析了多孔覆盖层表面强化沸腾传热的机理,并提出沸腾传热膜系数与温差关联式.  相似文献   

6.
高压汽水两相流内螺纹管壁温与临界热负荷特性的研究   总被引:7,自引:0,他引:7  
阐述了在西安交通大学高压汽水两相流试验回路上进行的垂直上升内螺纹管内汽水两相流传热特性的试验研究,试验管采用28mm×6mm的内螺纹管,试验管材料为:12Cr1MoV,试验参数为压力p=13.0~22.0MPa,内壁热负荷q=200~800kW/m2,质量流速G=2400~1800kg/(m2·s).试验确定了在上述参数范围内的壁温变化特性,得出了发生传热恶化的临界热负荷和界限质量流速。文中结论对采用内螺纹管的电站锅炉水冷壁的设计具有重要的实用价值。  相似文献   

7.
厦门东屿白骨壤群落生物量和能量   总被引:7,自引:0,他引:7  
讨论了厦门岛西海域海沧镇东屿的白骨壤群落的生物量和热值、群落各组分的能量分布状况。结果表明:该群落为单种组成的群落,其生物量现存量为4346.09g/m ̄2,各组分分配比是:侧根最多,占36.02%;多年生枝次之,占21.46%;幼枝较少,为0.33%;幼苗根最少,仅占0.11%。群落各组分干重热值相差较大,其中叶最高18.27kJ/g;主根居次,为17.85kJ/g。幼枝较低,16.11kJ/g;幼苗根最低为13.90kJ/g.群落的能量现存量为70553kJ/m ̄2,其中地上部占47.54%,地下部占52.46%。  相似文献   

8.
锥花丝石竹快速繁殖参数的探讨   总被引:1,自引:0,他引:1  
文中探讨了两个锥花丝石竹品种组织培养快速繁殖过程中激素组成对繁殖倍数、有效苗指数、诱导生根苗指数、年产苗量和生根率的影响。结果表明:激素浓度为6BA0.2mg/L~0.5mg/L、IAA0.2mg/L~0.5mg/L的条件下,t值介于6~7之间,a/k值小于1,一个芽的年产苗量大约为1×104株~1×105株。这一繁殖倍数既可达到快繁的目的,又可保证苗的健壮度。锥花丝石竹的生根则以1/2MS加NAA0.5mg/L,IBA0.5mg/L最适宜,两个品种的生根率均可达98%。  相似文献   

9.
多孔表面池式沸腾传热的研究   总被引:1,自引:0,他引:1  
本文就电化学腐蚀法加工的多孔表面管的池式沸腾传热性能进行了研究。这种加工方法工艺简单,成本低,在管子内外表面皆可加工,具有明显的优越性。实验结果表明:在相同条件下.沸腾所需的温差可以降低为光滑管的 1/2.4—1/4.5,根据实验数据求出单位面积上的汽化核心数n与温差△A关系式中的系数B和指数m,它们可以用来判断多孔表面的特性.对加工方法堤出了改进意见.  相似文献   

10.
本文以水为工质,研究了常压下化学腐蚀表面多孔管的池沸腾传热性能.结果表明,该表面多孔管的沸腾传热性能十分优异,在试验的沸腾温差下,表面多孔管的沸腾传热系数达光滑管的近10培.同时综合分析了该管强化沸腾传热的机理,预测了工业应用的前景.  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

13.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

14.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

15.
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-  相似文献   

16.
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-  相似文献   

17.
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that  相似文献   

18.
For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the  相似文献   

19.
<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with  相似文献   

20.
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