共查询到16条相似文献,搜索用时 109 毫秒
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报道了神光Ⅱ激光聚变实验中内爆燃料靶丸区电子温度、电子密度以及燃料面密度的X光诊断结果。在电子温度诊断中,采用X射线光谱学方法,根据聚变靶丸燃料区的Ar示踪元素的Ly-β线与He-β线的强度比推断出靶丸燃料区电子温度为(950±100) eV;在电子密度诊断中,利用靶丸燃料区Ar元素的He-β线Stark展宽确定聚变靶丸芯部的电子密度为(0.9±0.2)×1024 cm-3;在燃料区面密度诊断中,利用X光单能照相技术获得了内爆靶丸的燃料面密度为(3.2±0.5) mg/cm2。 相似文献
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以ICF实验塑料靶丸保气的需求为背景,研究了水蒸气在低压等离子体聚合碳氢(CH)膜、聚乙烯醇(PVA)膜、聚苯乙烯(PS)膜中的扩散渗透行为。根据实验数据,算出在40℃ 90%相对湿度下,水蒸气在三种样品膜中的渗透系数分别为1.906×10-13,5.950×10-15,.432×10
-14mol·m/(m2·s·Pa),并借助多层复合膜模型的近似算法,算出在40 ℃ 90%相对湿度的外界环境下,类似多层塑料微球结构的三层复合膜中,PVA阻气层所处环境的相对湿度为53.06%,推导出PVA所处环境的相对湿度与外层CH层厚度的关系式。研究表明:CH烧蚀层越厚,PVA所处环境的相对湿度越小,保气性能越好。 相似文献
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提出了一种利用总积分散射(TIS)测量K9玻璃基片表面散射和体散射的实验方法。首先采用磁控溅射技术在基片表面沉积厚度为几十nm的金属Ag薄膜,然后将基片的表面和体区分开考虑,通过TIS测得了基片上下表面的均方根粗糙度, 进而求得基片的总散射和表面散射,最后计算得到了体散射。分别利用TIS和原子力显微镜(AFM)测量了3个样品上表面所镀Ag膜的均方根粗糙度,两种方法所得的均方根粗糙度的数值相差不明显,差值分别为0.08,0.11和0.09 nm, 表明TIS和AFM的测量结果相一致。利用该方法测得3块K9玻璃基片的总散射分别为6.06×10-4,5.84×10-4和6.48×10-4,表面散射介于1.25×10-4~1.56×10-4之间,由此计算得到的体散射分别为3.10×10-4,3.30×10-4和3.61×10-4。 相似文献
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掺铒铋酸盐玻璃的光谱性质研究 总被引:12,自引:12,他引:0
研究了掺铒铋酸盐玻璃的吸收和荧光光谱性质,应用Judd-Ofelt理论计算了玻璃的三个强度参量Ωt=(t=2,4,6),分别为Ω2=3.71×10-20cm2,Ω4=1.86×10-20cm2,Ω6=1.28×10-20cm2,计算了Er3+离子的自发跃迁几率、荧光分支比等光谱参量.经荧光谱测试发现掺Er3+铋酸盐玻璃的荧光半高宽可达70nm.应用McCumber理论计算1.53μm处的受激发射截面可达9×10-21cm2.对Er3+离子在不同基质玻璃中光谱特性的比较发现,Er3+在铋酸盐玻璃中具有相对较高的受激发射截面和宽的荧光半高宽. 相似文献
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建立了内靶对兰州冷却储存环主环束流影响的单粒子跟踪模拟程序,对pellet小丸靶和碳靶对束流带来的负面影响进行了模拟研究,主要讨论CSRm内靶实验中的束流存活率和束流寿命状态。结果显示利用厚度为1×1016 atoms×cm-2小丸内靶时,2.6 GeV质子束流寿命在100 s量级,而对于目前技术水平下的碳膜靶 (厚度为 5×1017 atoms×cm-2),质子束流寿命为s量级;束流寿命和束流能量基本成正比关系,束流寿命和内靶厚度近似成反比关系。 相似文献
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以空心玻璃微球为研究对象,利用高压充气系统充气,测量了不同条件下玻璃微球对氘气在室温条件下的气体渗透系数。研究结果表明:微球的壁厚对气体渗透系数影响较大,2 mm以上厚壁球的气体渗透系数约5.0×10-22 mol·m-1·s-1·Pa-1,而壁厚小于1 mm时,渗透系数约1.56×10-20 mol·m-1·s-1·Pa-1,两者相差30倍。预充气挑选工艺对微球的气体渗透系数也产生一定影响,对于薄壁空心玻璃微球一次充放气气体渗透系数增加约50%,两次充放气则增大一倍左右。对上述影响因素进行了初步的探讨,气体渗透系数改变的主要原因是玻璃微球表面的结构裂纹、空位和缺陷。 相似文献
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Electroless preparation and characterization of magnetic Ni-P plating on polyurethane foam 总被引:1,自引:0,他引:1
Magnetic Ni-P plating was coated on surface of polyurethane (PU) foam by electroless plating technique. Morphology, composition, structure, thermal decomposing behavior and magnetic property of PU foam before and after plating were characterized by scanning electron microscopy (SEM), energy diffraction spectrum (EDS), X-ray photoelectron spectroscopy (XPS), infrared spectrometer (IR), X-ray diffraction (XRD), thermogrametric analysis (TG) and vibrating sample magnetometer (VSM), respectively. The results showed that the Ni-P plating was composed by particles whose diameters were in the range of 1-2 μm. Because of the Ni-P plating coated on surface of PU foam, peak intensity of the plated PU foam in IR and XRD were lower than those before plating. TG curves of PU foam before and after plating were composed of two decomposing stages. Because part of Ni in Ni-P plating was oxidized, TG curve of the plated PU foam was uptilt during 650-1000 °C. The plated PU foams are magnetic and can be used in some special application. 相似文献
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Haibing Liu 《Applied Surface Science》2010,257(4):1325-1330
A new activation process was developed for electroless plating to prepare wood-based EMI shielding material. Pd(II) was adsorbed on a wood surface modified with γ-aminopropyltrihydroxysilane (APTHS) formed by the hydrolysis of γ-aminopropyltriethoxysilane (APTES). After reduction of Pd(II), electroless plating was successfully initiated and an Ni-P coating was deposited on the wood veneer. The activation process and resulting coating were characterized by XPS, SEM-EDS and XRD. The metal deposition, surface resistivity and electromagnetic shielding effectiveness were measured. XPS analysis proved that Pd(II) was bonded to the amino group of APTHS and was reduced to Pd(0). The Ni-P coating was uniform, compact and continuous, and consisted of 3.39 wt.% phosphorus and 96.61 wt.% nickel. XRD analysis indicated that the coating was crystalline, which is thought to be related to the low phosphorus content. The plated birch veneers exhibited electromagnetic shielding effectiveness greater than 60 dB in the frequency range 10 MHz-1.5 GHz. 相似文献
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Investigation of the structure and the physical properties of nickel-phosphorus ultra-black surfaces
Y.F. Wang W.G. Fu M. Feng X.W. Cao 《Applied Physics A: Materials Science & Processing》2008,90(3):549-553
Ultra-black materials with low reflectivity can be applied in many fields of science and technology. We deposited nickel-phosphorus
alloys (Ni-P) on copper substrate with the electroless plating method and etched the electroless plating with nitric acid
in order to build ultra-black surface. On the one hand, the components of the Ni-P ultra-black surface layer were investigated
by XRF and XPS. SEM represented that there are innumerable conical holes with the different diameters on the surface. XRD
showed that the whole surface has become amorphous. On the other hand, compared to electroless blackening film by oxidation
and black chromium plating materials, the Ni-P ultra-black surface showed lower wavelength dependence and lower reflectance
in the range of 380–780 nm. In addition, the temperature of the sample with the Ni-P ultra-black surface increased more highly
and quickly compared to the black chromium plating film after exposure in an IR laser for about half an hour.
PACS 68.55.-a; 82.80.Kq; 78.68.+m 相似文献
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Nanocrystalline soft ferromagnetic Ni-Co-P thin film on Al alloy by low temperature electroless deposition 总被引:1,自引:0,他引:1
Soft ferromagnetic ternary Ni-Co-P films were deposited onto Al 6061 alloy from low temperature Ni-Co-P electroless plating bath. The effect of deposition parameters, such as time and pH, on the plating rate of the deposit were examined. The results showed that the plating rate is a function of pH bath and the highest coating thickness can be obtained at pH value from 8 to10. The surface morphology, phase structure and the magnetic properties of the prepared films have been investigated using scanning electron microscopy (SEM), X-ray diffraction analysis (XRD) and vibrating magnetometer device (VMD), respectively. The deposit obtained at optimum conditions showed compact and smooth with nodular grains structure and exhibited high magnetic moments and low coercivety. Potentiodynamic polarization corrosion tests were used to study the general corrosion behavior of Al alloys, Ni-P and Ni-Co-P coatings in 3.5% NaCl solution. It was found that Ni-Co-P coated alloy demonstrated higher corrosion resistance than Ni-P coating containing same percent of P due to the Co addition. The Ni-Co-P coating with a combination of high corrosion resistance, high hardness and excellent magnetic properties would be expected to enlarge the applications of the aluminum alloys. 相似文献
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为实现对惯性约束聚变(ICF)靶用空心玻璃微球(HGM)质量及性能的有效调控,研究了精炼温度对HGM批次产品中A级HGM百分数的影响,实验测试了不同精炼温度条件下HGM批次的平均直径和壁厚、抗张强度、对氘气的保气性能、表面粗糙度及其随时间的变化。测试结果表明:升高精炼温度并不是总有利于提高HGM的质量和性能; 当精炼温度低于1600 ℃时,满足ICF物理实验参数要求的HGM百分数随着精炼温度的增高而增加,但是,当精炼温度高于1600 ℃时,HGM的合格率则随着精炼温度的增高而显著下降; 随着精炼温度的升高,HGM的抗拉强度快速提高,表面粗糙度快速下降; HGM在室温下对氘气的阻气能力快速下降,且在大气中的潮解速率和程度显著降低。 相似文献