53 resultados para Mariales, Xantes, 1580-1660.

em Chinese Academy of Sciences Institutional Repositories Grid Portal


Relevância:

10.00% 10.00%

Publicador:

Resumo:

In this paper, the calculated results about the propagation properties of electromagnetic wave in a plasma slab are described. The relationship of the propagation properties with frequencies of electromagnetic wave, and parameters of plasma (electron temperature, electron density, dimensionless collision frequency and the size of the plasma slab) is analyzed.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

By using the kernel function of the smoothed particle hydrodynamics (SPH) and modification of statistical volumes of the boundary points and their kernel functions, a new version of smoothed point method is established for simulating elastic waves in solid. With the simplicity of SPH kept, the method is easy to handle stress boundary conditions, especially for the transmitting boundary condition. A result improving by de-convolution is also proposed to achieve high accuracy under a relatively large smooth length. A numerical example is given and compared favorably with the analytical solution.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

为了解决读出过程中全息数据的擦除问题,研究了新型双掺杂LiNbOa:Fe:Ru晶体的全息读出特性。分析了双中心和单中心记录方案光栅的读出特性,并联立双中心物质方程和耦合波方程进行了模拟计算。结果表明,双中心记录所得到的饱和全息的读出时间常数远低于LiNbO2:Fe:Mn晶体的读出时间常数;单色光记录可以实现有效的全息,且其读出时间常数远大于记录时间常数,表现为准态非挥发读出。分析表明,这可能由于Ru的能级比Mn更靠近Fe,更易被红光激发,从而使得双中心记录所得饱和光栅的存贮持久性降低;单色光记录中红光能够

Relevância:

10.00% 10.00%

Publicador:

Resumo:

The application of a Michelson interferometer with a self-pumped phase-conjugate mirror to measure small vibration amplitudes of a rough surface is described. The distorted wave front of the light that is diffusely reflected from the rough surface is restored by phase conjugation to provide an interference signal with a high signal-to-noise ratio. The vibration amplitudes of a stainless-steel sample are measured with a precision of similar to 5 nm. (C) 2000 Optical Society of America OCIS codes: 120.3180, 190.5040, 120.7280.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

A hexagonal array not only is a nature-preferred pattern but also is widely used in optoelectronical materials and devices. We report a simple method of hexagonal array illumination based on the Talbot effect that has a theoretical efficiency of 100%. An experimental efficiency of 90.6% with a binary phase (0, pi) hexagonal grating is given. This method should be highly interesting for applications of hexagonal array illumination in optical devices as well as in other hexagonal cells. (C) 2002 Optical Society of America.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

以(CH3)2Si(OC2H5)2为前驱体,采用溶胶-凝胶与有机合成相结合的方法,制得稳定性良好的涂膜液。采用旋转涂膜法在掺钕磷酸盐激光玻璃棒端面涂制防潮膜,膜层固化后透过率达96.5%,获得的膜层表面粗糙度优良,均方根表面粗糙度(RMS)为1.659nm,平均粗糙度(RA)平均为1.321nm;在激光波长1053nm,脉冲宽度1 ns条件下膜层的激光破坏闽值可达10~14 J/cm^2。经过“神光Ⅱ”高功率激光器物理实验运行,膜层使用期为五年,并且已经在我国“神光Ⅲ”原型装置上试用。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

首次合成了7,7,8,8-四氰基对苯醌二甲烷的脂类衍生物:TCNQ(C2H4COOR)2(R=CH3,C2H5,C3H7)及其铜电子转移复合物。通过元素分析确定这些化合物的组成,对这些化合成物在4000~400cm^-1范围内的主要红外光谱吸收峰进行了归属,并讨论了取代基对TCNQ类衍生物红外光谱的影响及其规律。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

羊草(Leymus chinensis (Trin.) Tzvel. )又称碱草,隶属禾本科,赖草属,因其营养价值高,富含蛋白质,适口性好,抗旱,耐盐碱,耐贫瘠,抗逆性强,适应性广等优点,对我国发展草原畜牧业和退化草地、荒漠化治理方面具有举足轻重的作用。近年来,由于自然环境变劣,荒漠化加剧,以及过度放牧等不利影响,加之羊草本身固有的“三低”问题(即结实率低、出苗率低、产草量低)已对羊草生物多样性维持构成了严重的威胁,严重限制了我国人工草地建设和天然草地的改良和沙化治理的步伐。加强羊草生物学研究,开展羊草种质生物多样性保护,成为当前研究的紧迫课题。经对国内外相关文献的查新发现:国外发表的文献匮乏,国内的报导大多集中在草原生态等宏观领域,在羊草繁殖生物学方面缺乏系统的研究。本文以本课题组从国内外收集的羊草资源为材料,从以下几个方面进行了初步探索: 一、羊草繁殖性状与遗传多样性分子标记指标的相关分析。利用分子标记与形态标记对随机抽取的17份羊草种质进行了种质评估的比较研究。结果表明:两种方法均在17份供试材料中鉴别出9份羊草种质,说明分子标记方法用于羊草种质资源鉴定是可行的,并具有快速、准确、不受环境条件限制等优点。在40个10 Mer的随机引物当中筛选出21个有效引物,以之对9份羊草材料进行RAPD 分析,共扩增出115条带,其中95条带表现出多态性,多态比率82.61%,并筛选出S1213-900,S1213-1700,S1215-5500, S1396-1370,S1384-900,S1202-5180,S1220-2200,S1381-1580,S1211-1300,S1211-800为羊草种质所具有的10个特异性标记,据此可将羊草种质与披肩草、赖草加以区分。同时在羊草种内亦发现13条可区分供试羊草种质的特有标记。形态标记与分子标记相关性分析结果显示:羊草种质的小穗数,种子千粒重,叶色,有性繁殖量和结实率5个形态学指标与遗传多样性指标---特有带百分率及遗传距离之间,存在一定相关性。同时对羊草种质资源在收集和评价过程中存在的问题进行了探讨。 二、羊草不同基因型无性繁殖特性比较研究。以本课题组从吉林、内蒙古等省份收集的10个基因型羊草为供试材料,在相同的生态因子作用下,以吉生1号羊草为对照,对10个基因型羊草的叶数增量、芽数增量、芽高度、芽间距、芽重量、根量六个无性系形态性状指标进行测评。结果表明:基因型的差异也是影响羊草无性系生长发育的重要影响因子。因此,在今后的羊草无性繁殖生物学研究中,应综合考虑环境因子和基因型因子对羊草无性繁殖生长发育的影响。在所测评的10个基因型中,各基因型的形态性状指标差异很大,栽3基因型较其他基因型优于对照吉生1号,此结论可为今后培育羊草新种提供重要资料。 三、羊草幼穗离体培养方法的建立。其方法是取羊草幼穗为外植体,经0.1%升汞溶液表面消毒后,接种到含2mg/L的2,4-D的MS培养基上,置于恒温25℃条件下诱导愈伤组织。在加有1mg/L2,4-D的MS培养基上继代2次后,转移到含1mg/L KT和0.5mg/LNAA的MS培养基上分化培养得到再生芽。在除去激素后的基本培养基上获得了生根的试管苗。试管苗移栽到温室后生长正常。羊草试管苗的分化因基因型和外源激素条件的不同而异。 四、羊草有性生殖特性的研究。在自然条件下进行了羊草自交、异交结实性实验,采用FDA染色法检测羊草小孢子活性,并观测羊草雌蕊、雄蕊发育的时空特点。结果表明:在大田中羊草异交结实率远大于其自交结实率;成熟花药中有活性的花粉达到92.2%以上;同时,在发育时间顺序和空间结构上,羊草的雌蕊、雄蕊并不妨碍自体授粉。因此,初步结论认为羊草具自交不和性。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

管理水平的高低直接关系到生物多样性保护的效果。生物多样性保护的管理涉及到很多方面,在生物多样性保护重要场所──自然保护区的评价标准,保护区内的居民问题,偷猎、偷伐问题以及调动包括领导与群众在内的保护积极性方面就3国的情况作一介绍。管理的另外两个重要方面,加强科研及公众教育问题也进行了讨论。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

本项目为云南省科委主任基金资助项目。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

应用PFU微型生物群落监测方法,对长期处于低水位状态下的白洋淀水质进行了综合评价。结果表明,白洋淀水域受府河污水的影响,淀内的内源性污染,对原生动物群落造成了极大的影响。与20世纪90年代的资料相比,淀内中心区4个采样点原生动物的群集种类数(1d)急剧下降,而丰度上升了1.28倍,表明内源性污染对白洋淀水质的影响加剧。

Relevância:

10.00% 10.00%

Publicador:

Resumo:

借助细胞培养和电镜技术,揭示了鳜球形病毒(Siniperca chuatsi spherical virus,SCSV)与鳜弹状病毒(Siniperca chuatsi rhabdovirus,SCRV)在草鱼鳍细胞(Grass carp fins,GCF)中共感染的现象。在筛选到敏感鱼类细胞系和建立了 鳜病毒体外增殖系统的基础上,取息典型病毒感染出血症的鳜组织,制备组织悬液,接种到GCF细胞中传代培养, 在攻毒后间隔不同时间收集细胞,对攻毒细胞的超薄切片进行电镜观察。揭示两种形态的鳜病毒可在同一个GCF

Relevância:

10.00% 10.00%

Publicador:

Resumo:

A silicon-on-insulator-based thermo-optic waveguide switch integrated with spot size converters is designed and fabricated by inductively coupled plasma reactive ion etching. The device shows good characteristics, including low, insertion loss of 8 +/- 1 dB for wavelength 1530-1580 nm and fast response times of 4.6 As for rising edge and 1.9 mu s for failing edge. The extinction ratios of the two channels are 19.1 and 18 dB, respectively.

Relevância:

10.00% 10.00%

Publicador:

Resumo:

A 3(rd) order complex band-pass filter (BPF) with auto-tuning architecture is proposed in this paper. It is implemented in 0.18 mu m standard CMOS technology. The complex filter is centered at 4.092MHz with bandwidth of 2.4MHz. The in-band 3(rd) order harmonic input intercept point (IIP3) is larger than 19dBm, with 50 Omega as the source impedance. The input referred noise is about 80 mu V-rms. The RC tuning is based on Binary Search Algorithm (BSA) with tuning accuracy of 3%. The chip area of the tuning system is 0.28x0.22mm(2), less than 1/8 of that of the main-filter which is 0.92x0.59mm(2). After tuning is completed, the tuning system will be turned off automatically to save power and to avoid interference. The complex filter consumes 2.6mA with a 1.8V power supply.