查询词典 Ld.

It is shown that in the small distance region of the bar-LD the intensity distribution of the bar-LD is constructed by separate beam spots emitted from each emitter. As the distance of the observation point from the bar-LD increases, the beam spots of the emitters begin to overlap, and even to form a flattop distribution in a large distance region.

结果表明，在距发光面较近处，各emitter辐射的光斑呈分离状；随着距离增加，各光斑开始交叠，甚至出现平顶；当距离足够远，bar型半导体激光器的远场光斑与单个emitter的辐射光斑几乎没有差异。

A simultaneous dual-wavelength continuous wave, quasi-cw or linearly polarized wave diode-end-pumped Nd:YAG laser operating at 1319nm and 1338nm is demonstrated. To the best of our knowledge, our experimental results achieve the highest level in the domestic domain. The simultaneous dual-wavelength laser provides an experimental basis for generating highly coherent THz wave radiation of 3.23THz by nonlinear optical difference frequency method.2. A diode-end-pumped Nd:YAG crystal, type-I critical phase matching LBO crystal intra-cavity frequency doubled, simultaneous multi-wavelength red laser at 659.5nm, 664nm and 669nm is firstly realized.

本论文主要围绕用于差频产生THz辐射源的多波长激光器及THz光子晶体的带隙特性分析而展开，论文的主要内容包括：一、从LD端面泵浦固体激光器的激光阈值公式出发，理论计算了腔镜对于两个波长的透过率关系，实现了LD端面泵浦Nd：YAG 1319nm/1338nm双波长激光连续、准连续及线偏振稳定输出。

Under constant temperature 20℃, the critical photoperiod of Papilio memnon was ED 13h 11mm:10h 49mm, under constant temperature 25℃, the critical photoperiod was ED 12h 49 mm:11h 11min.

在20℃恒温条件下，美凤蝶的临界光周期为LD 13h 11min：10h 49min；而在25℃恒温条件下，美凤蝶的临界光周期为LD 12h 49min：11h 11min。

Normative references GB 150 steel pressure vessel GB 152.1 ~ 152.4 fastener hole and Shen Kong GB 196 common Cast Gate Valves thread of basic dimensions (diameter l ~ 600mm) GB 197 common thread of tolerance and fit (diameter of 1 ~ 355mm) GB 798 live bolt GB 897 stud bm = ld GB 898 stud bm = 1.25d GB 901 Class B and other long stud GB 5782 Hexagon head bolts A and B class GB 5796.1 ~ 5796.4 Cl 150, 300, 600 Lb Cast Steel Gate Valves trapezoidal thread GB 6175 2 Hexagon nut A and B class GB 9112 types of steel pipe flanges GB 9113.1 ~ 9113.26 Integral steel pipe flanges GB 12220 Universal Valve Logo GB 12221 length of the Cl 900, 1500 Lb Cast Steel Gate Valves valve structure of metal flange GB 12222 Multi-turn valve actuator attachment GB 12224 General requirements for steel valves GB l2228 General Valve carbon steel forgings GB 12229 Universal Valve carbon steel castings GB 12230 Universal Valve austenitic steel castings GB / T 12252 General requirements valve supplier ZB Jl6 006 test and test valve

引用标准 GB 150 钢制压力容器 GB 152.1～152.4 紧固件通孔及沉孔 GB 196 普通螺纹基本尺寸(直径l～600mm) GB 197 普通螺纹公差与配合(直径1～355mm) GB 798 活节螺栓 GB 897 双头螺柱bm＝ld GB 898 双头螺柱bm＝1.25d GB 901 等长双头螺柱 B级 GB 5782 六角头螺栓 A和B级 GB 5796.1～5796.4 梯形螺纹 GB 6175 2型六角螺母 A和B级 GB 9112 钢制管法兰类型 GB 9113.1～9113.26 整体钢制管法兰 GB 12220 通用阀门标志 GB 12221 法兰连接金属阀门结构长度 GB 12222 多回转阀门驱动装置的连接 GB 12224 钢制阀门一般要求 GB l2228 通用阀门碳素钢锻件技术条件 GB 12229 通用阀门碳素钢铸件技术条件 GB 12230 通用阀门奥氏体钢铸件技术条件 GB/T 12252 通用阀门供货要求 ZB Jl6 006 阀门的试验与检验

Are the main products are: LD series of e-Rally-testing machine, MWD Series Panel universal test machine, WDW series of electronic universal test machine, TLS series of spring tension and compression testing machine, QTW series of gas spring testing machine, self-locking nut to reverse Testing machine, the impact testing machine, and other products.

现主要产品有：LD系列电子式拉力试验机、MWD系列人造板万能试验机、WDW系列电子万能试验机、TLS系列弹簧拉压试验机、QTW系列气弹簧试验机、自锁螺母扭转试验机、冲击试验机等多种产品。

Through the analysis of the loss and threshold characteristics of a laser diode, the threshold current density of LD with external feedback is calculated, according to the theory of multi-beam interference and the definition of equivalent reflection factor.

通过对半导体激光器的损耗和阈值电流特性的分析，引入等效反射系数的概念，根据多光束干涉的原理，导出了在外腔反馈作用下LD的阈值电流公式。

The following NIBCO butterfly valves are approved by ABS for marine service: LD or WD 2000 and 3000 series.

下列美国尼伯科蝶阀通过ABS认证适用于船舶应用领域：LD或WD2000和3000系列。

A LD rangefinder is designed which has the characters of low cost,reliable and high performance to price

本课题从设计1种成本低、工作稳定的高性价比车用LD测距仪出发，分别对测距仪的工作原理及参数确定

The fluorescent antibody was prepared with IgG purified from rabbit anti-goatpox virus serum and used to detect the antigen of GPV in pock samples and BHK-21 cells infected respectively with GPV strains B,Y,LD and QL.

用兔抗山羊痘病毒IgG制备荧光抗体，检测了临床发病山羊皮肤痘疹切片和山羊痘病毒B、Y、LD和QL株感染的BHK-21细胞中的病毒抗原。

"We just want to let the whole world know something bad is going on in Tibet," said 44-year-ld Lobsang Gendun, a machinist at O.C. Tanner Company in Salt Lake City.

&我们只是希望让全世界都知道坏事正在进行中，在西藏，说：& 44年- LD的洛桑根敦群培，一名机械师在业主立案法团丹拿公司在盐湖城。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。