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1.
随着媒体行业的兴盛繁荣,历史电视剧一度成为人们消费的对象,因历史传统观的影响,对于历史本身认识存在一定偏差,历史电视剧的发展,让人们对历史形态具有了多样化的认识,随着当代历史剧铺天盖地的席卷,由于剧情需要、叙事的想象性,历史剧不可避免存在夸张及虚构成分,误导了一些受众,本文在跨学科视野下,对当代历史电视剧进行了分析讨论。  相似文献   

2.
可生物降解的医用高分子矫形材料   总被引:1,自引:0,他引:1  
对应用于矫形外科的可生物降解高分子材料研究进展进行了评述,介绍了这些高分子材料的发展历史、分类、合成方法及应用,对今后可能的研究方向进行了展望。  相似文献   

3.
国土资源档案是国土资源管理工作的历史记载,是合理规划、利用土地的重要记录,是解决土地利用矛盾的重要依据,具有凭证价值和法律效力,为我们提供各种历史资料、数据,对揭开历史遗留问题起了很大的作用。同时也是进行土地管理科学研究的参考资料。依托现代科学技术手段,实现国土资源档案信息化管理,对践行科学发展观,深化土地管理制度改革,服务全社会经济建设,创新国土资源管理建设显得十分重要。  相似文献   

4.
本文对散货船的历史、类型进行了简概述,并对近期国际市场对散货船需求现状、需求前景进行了分析。在列举了主造船国家获得的一些散货船订单后,对我国船舶工业的竞争能力提出了希望。  相似文献   

5.
历史教育既可成为个人发展的有力手段,又可以通过其引导学生感悟历史上人们对事物认识、辨析、判断、处理和发明创造,培养其具有自觉性推动历史进步的责任感。本文从培养高中学生社会责任感的途径与方法方面对高中学生社会责任感的培养和中学历史教学的关系进行着重的阐述,并就如何在学科教学中进行行之有效的教学实践展开探论。  相似文献   

6.
渑池县是河南省的竹林产地之一。本文对该县竹林栽培历史、丰产栽培技术措施等,进行了全面和系统的调查总结。从中找出了豫西淡竹林丰产培育的栽培模式,针对竹林栽培历史、丰产栽培技术措施等问题提出了建议。  相似文献   

7.
对于长笛演奏的专业人员或者爱好者来说,由于“爱屋及乌”,大部人员都特别希望了解到长笛在练习曲上的历史与发展情况,可以在心中对长笛形成一种历史的沉淀,从而在实际的演奏上抒发情怀,用悠久的历史沉淀来指导自身对现代音乐的掌握,真正的奏响长笛所要表现的音符,把自身的感情融入到音符上给人一种力量、激情、希望等。因此,本文主要从长笛练习曲的历史与发展情况出发进行浅论,以期能为部分人员对长笛练习曲的发展历史进行掌握提供一份参考资料。  相似文献   

8.
用差示扫描量热法研究QY89 11-Ⅱ缠绕工艺   总被引:2,自引:0,他引:2  
用差示扫描仪对QY8911-Ⅱ双马来酰亚胺树脂的固化反应进行了分析,研究了热历史对树脂的固化反应及其性能影响,随着热历史温度的升高,树脂的熔点和固化度随之升高,热焓逐渐减小,确定了80℃加热的纤维缠绕工艺。  相似文献   

9.
城市精神凝聚了一座城市的历史传统、时代风貌和文化底蕴,集中反映了市民的思想观念、道德风尚和价值追求。黄岛新区拥有自己形成和发展的历史及特有的文化个性,并形成了独特的城市精神风貌。本文结合黄岛新区的实际,分析了城市精神引领新区发展的意义、从历史、地域特色、城市追求多个视角下阐述了黄岛新区城市精神内涵及对培育途径三个方面进行了分析探讨。  相似文献   

10.
包胜  赵政烨  杨健  顾益斌 《工程力学》2022,(S1):384-388+396
以往的研究已经证明加载速率会对铁磁性材料的力学行为和周围压磁磁场产生影响,为了进一步研究历史加载速率对后续压磁磁场演变规律的作用,对Q345工程结构钢进行了一系列循环拉伸试验,采用磁通仪对试件压磁磁场进行在线监测,研究试件在经历不同的历史加载速率后,其压磁磁场的演变规律。结果表明:加载速率历史是影响压磁磁场演变的重要因素之一。  相似文献   

11.
Driving through rain results in reduced visual performance, and car designers have proposed countermeasures in order to reduce the impact of rain on driving performance. In this paper, we propose a methodology dedicated to the quantitative estimation of the loss of visual performance due to the falling rain. We have considered the rain falling on the windshield as the main factor which reduces visual performance in driving. A laboratory experiment was conducted with 40 participants. The reduction of visual performance through rain was considered with respect to two driving tasks: the detection of an object on the road (contrast threshold) and reading a road sign. This experiment was conducted in a laboratory under controlled artificial rain. Two levels of rain intensity were compared, as well as two wiper conditions (new and worn), while the reference condition was without rain. The reference driving situation was night driving. Effects of both the rain level and the wipers characteristics were found, which validates the proposed methodology for the quantitative estimation of rain countermeasures in terms of visual performance.  相似文献   

12.
电解液对PAN-基碳纤维电化学改性效果的影响   总被引:2,自引:0,他引:2  
分别采用磷酸、氢氧化钠和碳酸氢铵3种电解液对PAN-基碳纤维进行电化学改性处理,研究电解液种类对碳纤维电化学改性效果的影响规律.通过酸碱滴定法、原子力显微镜表征和复合材料界面剪切强度(IFSS)测试,分析纤维表面酸性官能团含量、表面形貌及其复合材料界面强度的变化规律.研究结果表明:采用磷酸和氢氧化钠电解液处理时,纤维表面酸性官能团含量随着电流强度的增加先迅速增大而后逐渐减少,电流强度为0.4 A/g时达到最大值;采用碳酸氢铵电解质时,纤维表面酸性官能团含量随着电流强度的增大先缓慢增大而后迅速减少,电流强度为1.4 A/g时达到最大值.针对纤维表面形貌的AFM分析表明,在磷酸和氢氧化钠电解液中处理时,复合材料的IFSS主要受纤维表面刻蚀作用的影响,而采用碳酸氢铵电解液处理时,复合材料的IFSS主要受纤维表面酸性官能团含量的影响.  相似文献   

13.
The effect of particle morphology of the components on the physical stability of ordered mixtures was determined for a model system comprised of a mixture of micronized aspirin and a monodisperse carrier. Spray-dried lactose, crystallized lactose, microcrystalline cellulose, and dextrate were used as carriers. The surface texture of the carriers was quantified in terms of the ratio of the perimeter of the particles to that of an idealized shape at a constant magnification. Mixtures containing highly textured carriers segregated to a lesser extent than those containing smoother textured carriers. This was postulated to be due to the presence of a higher concentration of surface asperities on the coarse carriers that can constitute potentially strong adhesion sites for the fine component because of their higher energy relative to adjacent areas on the surface. The effect of the addition of a ternary component, magnesium stearate, on the stability of the above mixtures was studied. The observed differences in the segregation response were attributed to electrostatic charge effects.  相似文献   

14.
Gizeli E 《Analytical chemistry》2000,72(24):5967-5972
The sensitivity of the acoustic waveguide sensor to mass deposition in the presence of liquid was optimized as a function of the over-layer thickness. The waveguide geometry consisted of a 0.2-2.2-microm poly(methyl)methacrylate (PMMA) over-layer deposited on the surface of a shear acoustic wave device and supported a Love wave. The response of each polymer-coated waveguide was initially assessed by monitoring the frequency and insertion loss of the device in the presence of air. Sensitivity to viscous and mass loading was studied by recording the amplitude and phase of the wave during the application of water and of a supported lipid bilayer, respectively, on the device surface. Supported bilayers are a versatile system for mass calibration in the presence of liquid because they can be formed spontaneously on a hydrophilic surface, resulting in a layer of reproducible mass density. Results clearly showed that the response of both amplitude and phase depends on the over-layer thickness and increases with the thickness of the polymer layer. Phase was generally found to be more sensitive than amplitude to both viscous water and mass loading. The maximum sensitivity to vesicles deposition was measured at 250 cm2 g(-1) and was detected when 1.3 microm of PMMA was used as a waveguide layer. Results showed that the sensitivity of the acoustic wave sensor can be improved by simply increasing the thickness of the PMMA and that supported phospholipid layers can form an ideal system for both mass calibration and interfacial modification.  相似文献   

15.
The in vitro behaviour of bioactive glass coatings grown by Pulsed Laser Deposition on silicon and titanium substrates is presented. The critical thickness of the coatings needed to develop the complete bioactive reactions when immersed in Simulated Body Fluid was evaluated. The influence of the substrate on the reactivity of thin coatings, which lead to the production of calcium phosphate and silica-rich layers, is discussed. Furthermore, the temporal evolution of the bioactivity process was followed for thick bioactive glass coatings deposited on biomorphic silicon carbide ceramics. In the in vitro tests of coated porous materials, the surface area to volume of Simulated Body Fluid ratio was revealed as a key parameter. The effective surface area should be carefully estimated in order to avoid adverse effects on the bioactive process.  相似文献   

16.
The effect of a number of different liquids on the rate of crazing of polycarbonate was studied. It was found that liquids either had no effect on the mechanical response, caused immediate cracking and fracture or caused a measurable rate of crazing, depending on the solubility parameter of the liquid. The rate of crazing in those liquids that caused crazing was found to vary inversely with the square root of time, indicating that diffusion through the end of the craze controlled the craze growth. Pre-immersion in one of the solvents, ethanol, had a strong effect on the subsequent rate of crazing under a constant load. The pre-immersion of pre-cracked samples initially caused an increase in rate of crazing. After a pre-immersion time of roughly 24 to 72 hours, the subsequent rate of crazing decreased with an increase in pre-immersion time. When the pre-immersion was conducted on an uncracked specimen and the crack was generated after the pre-immersion, the subsequent rate of crazing increased steadily with pre-immersion time. An explanation for the observed results is given.  相似文献   

17.
陀螺安装误差影响视轴稳定平台精度的机理研究   总被引:2,自引:2,他引:0  
李岩  张智永  范大鹏 《光电工程》2007,34(9):10-15,29
针对陀螺安装误差影响视轴稳定平台精度的问题,深入研究了其影响的作用机理及程度.以两轴稳定平台为具体对象,应用PIOGRAM图方法,讨论了安装误差对陀螺敏感量的运动学影响.并对陀螺安装误差影响系统精度以某实际模型为例进行了仿真分析,得出了其对稳定精度影响更为具体的解释.这对陀螺安装误差的标定、机构设计中安装面精度的取定以及误差分配等都具有参考作用.  相似文献   

18.
Three high chromium white cast irons were examined in the as-cast state to determine the effect of the carbon content on the fracture toughness. The plane strain fracture toughness K Ic and the fracture strength were measured for each alloy. X-ray mapping was used to identify the phases on the fracture surfaces. Scanning electron fractography and optical microscopy were used to determine the volume fraction of each phase on the fracture surfaces. It was found that most fracture occurred in the eutectic carbides, but that for the alloys with a reduced volume fraction of eutectic carbides, a small amount of crack propagation occurred in the austenitic dendrites. This change in crack path correlated with an increase in fracture toughness. The Ritchie-Knott-Rice model of brittle fracture was applied. It was found to sensibly predict the critical length for fracture for each alloy. Deep etching was employed to examine the distribution of eutectic carbides. It was found that the eutectic carbides formed a continuous network in each case.  相似文献   

19.
改进自动网格法测量相似材料模型变形   总被引:5,自引:0,他引:5  
在研究地下采矿引起的岩层移动及变形问题时,通常采用相似材料模型法,一般采用基于图像处理的自动网格法来自动识别变形。目前的自动网格法主要局限于灰度图像,且编码算法繁琐,可靠性低。本文提出一种改进的自动网格法,基于彩色图像,充分利用了颜色信息,并且采用基于网格区域的搜索匹配算法,搜索快速,准确可靠。  相似文献   

20.
谢长贵  曾海 《计量学报》2015,36(6):595-598
针对某1220冷轧机带钢表面振纹形成的原因进行了跟踪测试和深入研究。在对1220冷轧机振动测试的基础上,通过对机架动态特性分析及工作辊周期内各阶段振动信号的分析研究,发现在支撑辊使用中后期,轧机以600Hz左右的第7阶固有振动为主;在轧制速度为中高速稳定轧制阶段,工作辊对中间辊的相对运动形成工作辊表面振纹;该辊面振纹反作用于轧机,引起轧机强迫振动,进一步加速振纹的形成,轧机的振动为共振与强迫振动共存。在分析振纹产生机理的基础上,结合振纹间距与振源的关系,找到了引起1220轧机产生振纹的原因,提出了振纹抑制措施,并取得了很好的抑制效果。  相似文献   

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