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吸收带

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The full space calculation model, which suits for the asymmetric structure sometimes even including air below the surface of medium, can enable simulative result to approach real one. The FDTD algorithm based on the mixed ABCs is proper to calculate the transmission line where the electromagnetic wave is transmitted in order to send electromagnetic energy along central conductor. The calculation efficiency will be raised if the PML absorbing boundary condition is set on both planes of transmitting direction and so is the MUR two-order absorbing boundary condition in the other planes.

全空间计算模型是适合所有的不对称结构的待研究体的,而且包括了介质下面的空气部分,使仿真更加的接近实验真实情况;基于MUR-PML混合吸收边界条件的时域有限差分法非常适合计算传输线这种结构,因为传输线是传送电磁波的,电磁能量主要是沿着中心导带行进,因此在两个传输端面上设置PML完全匹配层吸收边界条件,在其他面上设置MUR二阶吸收边界条件,会大大提高计算效率,而且计算结果与XFDTD仿真软件计算结果相比较,基本趋于一致。

XRD,X-ray EDS analysis,AFM and Fourier transform infrared spectroscopy were employed to characterize PbSe thin films. The results show that all of the films were heteromorphy and the growth temperature has effect to the diffract peaks of the films. The contents of PbSe thin films by PLD consisted with the targets,and realizing thin films deposited with same constitutes; the films had rather flatness surface and compact structure; the peak-to-tail roughness of PbSe thin films surfaces was less than 200nm;they had sensitivity to light of a specified wavelength and obvious absorption edge at 5μm corresponding to band-gap width of PbSe thin films;light of wavelength less than 5μm was strongly absorbed.

通过脉冲激光沉积法在Si(111)和SiO2玻璃基片上制备了PbSe薄膜。X射线衍射、X射线能谱、原子力显微镜、傅里叶变换红外光谱仪测试结果表明:所有制备的薄膜都为多晶薄膜,发现薄膜生长温度对薄膜衍射峰有一定影响;PLD法制备的薄膜的成分与靶材的基本一致,实现了同组分沉积;所有薄膜表面比较平滑,表面不平整度小于200nm,结构比较致密;PbSe薄膜对红外光具有敏感的响应特性;在波长为5μm处存在有明显的吸收边,此吸收边对应于直接带隙PbSe材料的禁带宽度;对应于波长小于5μm的红外光,PbSe薄膜存在有明显的强吸收。

The spectroscopic and electrochemical studies suggest the energy structure of this class complex can be easily controlled by modification. With the introduction of electron-donating arylamino groups, the obtained complexes show intense and continuous absorption bands in the region of 250-550nm with strong metal-to-ligand charge transfer dπ(Pt →π* transitions (ε~ 2×104 dm3 · mol-1 · cm-1). Complexes involving the construction of D-π-A type systems also display continuous absorption bands in the region of 400-750nm, rising from the overlapping effect of MLCT and LL'CT bands.

其中,芳胺及其二聚体类修饰基团的引入,使其配合物MLCT吸收谱带的摩尔吸光系数增加,并在250~550nm范围内形成了强的连续吸收;具有D-π-A结构的配合物,由于MLCT吸收谱带和LL'CT吸收谱带的协同效应,导致在400~750nm范围内形成连续吸收;得到了从绿光到深红光的磷光发射系列配合物,并采用真空蒸镀的方法获到了外量子效率分别为5.7%和5.0%的橙光和橙红光多层电致发光器件。

The research results indicate that LED integrated photopanel as interior illuminant, which emit monochromic light such as red light(660~680nm)and blue light(430~450nm), not only cover with spectrums absorbed by the plant or algae for photosynthesis, enhance the light energy absorbed by chlorophyll a and the growth of Spirulina platensis, increase greatly microalgal biomass and the its content of photosynthetic pigments; but also decrease enormously the absorption spectrums not need for photosynthesis, save energy at more than 38.75%.

从LED集成光电板的光电特性、光热效应、光衰减性、光辐射特征与植物和藻类光吸收特征的相匹配性及LED辐射单色光对螺旋藻的光合色素含量的影响等几方面,分析研究了LED集成光电板作为光生物反应器内部光源的特性及可行性,研究结果表明,LED集成光电板作为光生物反应器的内部光源,它所发射的单色光谱红光660~680nm、蓝光(430~450nm,不仅能覆盖植物和藻类光合作用所需要吸收的光谱能带,促进叶绿素a对光能的吸收和螺旋藻的生长,增强光合作用,使细胞生物量与光合色素含量显著提高;而且不被吸收的光谱减少,节能达38.75%,无疑它将是光生物反应器潜在最有效的光源。

The absorption spectrum center wavelength of dolomite is near 232 μm is shorter than 235 μm of limestone,and thus RBD7 and RBD8 can be employed effectively to identify dolomite and limestone,respectively. Felsic rocks show AlOH and Fe3+ absorption characteristics in the VNIRSWIR region,while the maficultramafic rocks show Fe2+ and Fe,MgOH absorption features,hence the use of different valence state of iron and secondary minerals can distinguish them:ASTER band2/band1 represent Fe3+ distribution,ASTER band2/band1 represent the Fe2+ distribution,RBD6 can estimate the AlOH mineral abundance. Psammitic/pelitic schist containing phengite,chlorite,stilpnomelane,as well as the weathered surface covered by clay minerals,exist characteristic absorption spectrum in the 221 μm(band 6),and has a high reflectance in 165 μm(band 4),while the blueschist/greenschist show high reflectance in the 221 μm(band 6),and it exit low reflectance in 165 μm(band 4),and blueschist/greenschist appear low ASTER band4/band6 ratio.

白云岩的CO2-3吸收谱带中心波长位于232〖KG*3〗μm,与灰岩的CO2-3 吸收谱带中心波长位置235 μm相比,具有向短波长方向移动的特点,据此可以利用RBD7、RBD8分别有效的识别白云岩和灰岩;长英质岩石显示AlOH和Fe3+ VNIRSWIR吸收特征,而基性超基性岩石显示Fe2+和Fe、MgOH特征,利用不同的铁价态和次要矿物可以区分它们:ASTER band2/band1代表了含Fe3+矿物分布信息、ASTER band5/band4代表了含Fe2+矿物分布信息、RBD6可以估计AlOH矿物的丰度;砂质/泥质片岩含较多的多硅白云母、绿泥石、黑硬绿泥石以及风化后表面覆盖的其它粘土矿物,在221 μm(band 6)存在有特征的吸收谱带,并且在165 μm(band 4)具有较高的反射率,而蓝片/绿片岩在221 μm(band 6)反射率较高,不具有明显特征吸收谱带,同时其在165 μm(band 4)反射率较低,因此蓝片/绿片岩ASTER band4/band6 比值低。

Accordingly, the Q bands of them blue shifted by 6mn and 13nm, respectively. The fluorescence emission wavelengths of Cd-pheophytin a and Cd-pheophytin b observed at 660nm and 649nm, respectively, which were shorter than those of corresponding pheophytin a and pheophytin b by 10nm and 9nm, respectively.

研究发现:在光吸收性质上,与脱镁叶绿素a和b相比,镉叶绿素a和b在Soret带的吸收峰位置分别红移了19nm和11nm,而在Q带则分别蓝移了6nm和13nm;在荧光性质上,镉叶绿素a和b的荧光发射波长比脱镁叶绿素a和b分别蓝移了10nm和9nm。

The absorption bands observed for Pb-pheophytin a at 462nm and 673nm , while for Pb-pheophytin b at 480nm and 662nm . Compared with pheophytin a and pheophytin b, all these bands red shifted more or less. Among the reported metallochlorophylls, the degree of red shift of Pb-pheophytin in Soret band was the largest by 54nm and 44nm for Pb-pheophytin a and Pb-pheophytin b, respectively.

实验表明:对铅叶绿素a和b系列来说,它们在Soret带、Q带的特征吸收峰分别在462nm,673nm和480nm,662nm;与脱镁叶绿素a,b相比,铅叶绿素a,b在Soret带和Q带吸收峰均有不同程度的红移;与现已报道的金属叶绿素相比,铅叶绿素a,b在Soret带的红移程度最大,分别为54和44nm;铅叶绿素不具有荧光活性,并能猝灭脱镁叶绿素的荧光。

METHODS: Eight fresh patellae specimens were divided into two groups at random, AO steel wire group (n = 2) and absorbable tension band group (n = 6) to create models of transverse fractures, which were separately fixed by absorbable tension band, steel wire tension band + Kirschner wire to measure their biomechanics function. If fracture gap reached 1.0 mm, the fixation failed.

随机分成AO钢丝组2个和可吸收张力带组6个,制成横断骨折模型,分别用可吸收张力带、钢丝张力带加克氏针进行内固定,测定它们的生物力学性能,骨折端分离1.0 mm为固定失效。

Zinc oxide green phosphors with hexagonal wurtzite structure have been synthesized by calcining zinc sulfide with some certain amount of halides MX (X=F, Cl, Br, I; M=Na, K, NH_4, Zn, ZrO).

2该类荧光粉中S和卤素的含量分别在0.6-2%和3-4%范围,可看成是S,Cl共掺杂的ZnO荧光粉。紫外可见吸收光谱证明S和Cl的掺杂可以降低ZnO的带-带吸收强度,并在3.06ev(399nm)出现新的吸收峰。

The relationships between strain and stress of several kinds of high strength fibers, such as Kevlar, Twaron and Dyneema were obtained, and the dependence of mechanical properties of fibers on the strain rate was gotten and explained from the microstructures and deformation mechanism of fibers. Then, the damage and failures of plates with the reinforcement of fibers under high velocity impacting were studied experimentally. Based on experimental results, a set of equations was presented to depicted the deceleration of penetrator. The dynamic response of fiber cluster and sandwich were simulated successfully with a new algorithm and code, which was developped by our group. The coupling effect of stress wave and thermal conduction could be considered with acceptable accuracy and CPU time.

其中,获得了以芳纶纤维为代表的7种纤维的动态应力应变关系,从材料微观机制解释了纤维束的应变率相关特征;得到了板材在高速冲击下的能量吸收机理,以及影响能量吸收机制转变的主要因素;发展了一种新型的原位光学测试技术,以之可以测量试件在冲击加载下的变形场及其演化,该技术除了在本项目应用外,还可以对剪切带的萌生演化、孔洞动态扩张规律进行较好的观察,以弥补相关研究中实验证据的缺乏;发展了含热传导的冲击动力学有限元程序,在侵彻、绝热剪切带、脉冲激光诱导结构破坏等问题的分析中得到了较好的应用。

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