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By introducing fused-silica prims tocompensate the group velocity dispersion, as short as 8.5 fs pulses at 710nm isachieved without employing chirped mirrors. In our knowledge, this is the shortestpulses produced domestically from a KLM Ti:sapphire laser in China. Finally, The amplitudes and phases of femtosecond pulses generated from theKLM Ti: Sapphire laser are diagnosed by using the technique of second-harmonicgeneration-frequency-resolved optical gating.
第三,在实验上,在自行研制的自锁模钛宝石飞秒激光器中,改进腔的设计,较好地减弱了腔内频率依赖的腔模效应对频谱展宽的限制作用,获得了最宽达144nm的宽带光脉冲频谱输出,并在未采用啁啾镜的情况下,利用三阶色散系数小的熔融石英对补偿色散,获得了8.5fs光脉冲输出,为目前国内最好记录,达到国际先进水平。
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In range of 300℃~900℃, all the transition metal oxide catalysts could get high ammonia conversion, during the initial stages of the reaction, the SO〓 conversion is relatively low since the catalysts have not been sulfureted, but it increases gradually and attain constant with rising temperature and time continuance,〓 is better than other catalysts in reactivity and elemental sulfur selectivity; XRD indicates that, in the SO〓-SCR process, stable transition metal sulfide is generated which is very important to SO〓 reduction and transition metal sulfide probably is the active phase of catalyst, further the reduction of SO〓 by H〓 to H〓S is the limiting step of all process, then the activity is somewhat related to its lattice oxygen yet not so notable; XPS indicates that little sulfur on surface exists as S〓 in sulfate, showing that TiO〓 could restrain the generation of sulfate.
对于过渡金属氧化物催化剂的研究发现,在300℃~900℃范围内,不同的催化剂均可获得很高的NH〓转化率,反应初期由于催化剂还未硫化,所以SO〓的转化率较低,随着温度升高和反应时间的延续,SO〓的转化率逐渐升高并达到了稳定值;七种过渡金属氧化物中,以〓对于NH〓还原SO〓反应的活性和选择性最好;XRD结果表明在NH〓-SO〓反应后生成了稳定的硫化物相,硫化物对SO〓的还原过程具有重要作用,催化剂的活性相可能是过渡金属硫化物,而且在硫化物催化剂上进行的H〓还原SO〓生成H〓S的反应是整个过程的速率控制步骤,所以催化剂的活性与其自身的晶格氧的氧化还原能力有一定的联系,但关系不明显;XPS结果表明催化剂表面的硫大部分以过渡金属硫化物的形式存在,只生成少量的S〓,说明TiO〓催化剂能够较好的抑制硫酸盐的生成。
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The inherent unreliability of the technology. Add serious technology use to the mix, and a teacher needs infinite patience. Ask even the most dedicated teacher-users about the reliability of these machines and their software. Most schools can't afford on-site technical support. When they do have coordinators and eager students who troubleshoot problems and do the repairs, there are still software glitches and servers that crash, torpedoing lessons again and again.
其它方面对教师的苛求——高中教师需要通晓本专业学科知识;他们需要维持课堂教学秩序;他们需要发现处理学生各种不良行为习惯,防患于未然;他们需要对待每个学生既和蔼可亲又要严格要求;而且,按照上级行政命令培养学生达到高等院校入学要求以及让学生能够完成毕业考试,教师们必须敦促学生完成练习与其它作业并且要对学生考试成绩好坏负有直接责任。
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There is a new northern bean made available to farmers and breeders that can resist common bacterial blight – and it is high-yielding too. Named "ABC-Weihing", the bean cultivar was developed by University of Nebraska bean breeder Carlos Urrea, and Phil Miklas, a geneticist at the Agricultural Research Service using marker-assisted selection. The new bean variety resisted eight strains of bean rust and all non-necrotic strains of bean common mosaic in greenhouse tests, and also had an average seed yield of 1,869 pounds per acre.
美国农业部网站2007年7月6日消息,美国内布拉斯加州大学豆类育种专家Carlos Urrea 以及美国农业研究服务局的遗传学专家Phil Miklas 使用标记辅助选择的方法研究出了一种新的北方豆类品种&ABC-Weihing&,这种新品种在温室测试中可以抵抗八种菜豆锈病以及所有未坏死的菜豆普通花叶病毒,并且可以达到每英亩平均1869磅的产量水平。
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According to this phenomenon, we analyze the original circuit structure of unreasonable, in the original circuit has added a intermediate relay (5J), a limit switch, and take advantage of the original paper cutting, the unused in the buttons on the normally closed contact, specifying the control switch some of cam shape change, so that you solve the Cutter knife to cut the ?
根据这种现象,我们分析了原电路的不合理结构,在原电路中添加了一只中间继电器(5J)、一只行程开关,并利用了原切纸按钮中未用上的常闭触点,同时将控制行程开关的凸轮形状稍加改变,这样就彻底解决了切纸刀切下后自动复位难的问题,使切纸速度达到了要求的次数。
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In light of the actual condition in Pangang Group the high efficient compound dephosphorizer is developed by use of the dephosphorizing technology "single slag process" in converter smelting.
结合攀钢实际情况,利用转炉单渣法冶炼脱磷技术,开发应用了高效复合脱磷剂,使平均脱磷率达到89.40%,与转炉预处理双渣法脱磷技术相当,试验炉次的成品w≤0.015%,且未增加冶炼周期,为350km/h高速铁路用钢轨等钢种的稳定生产提供了技术支撑。
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Through our questionnaire, many people think it is required to have oral health workers to assist the affairs of dental clinic or dental departments in the hospital, and it is necessary to set up related departments to provide training. There will decrease of 8.35% and 9.9% in the government official and dentist who wish to take cruses in the relate department of the oral health, if the government doesn't set law to protect their right.
经由问卷调查,显见多数人认为牙科医疗院所是需要牙科口腔卫生人员协助牙科相关事务,并设置相关科系培育人才;也从调查政府卫生单位及牙科医疗院所之人员中,得知如果政府未订有相关法律保障的话,对就读口腔卫生相关学系的意愿,分别下降8.35%及9.9%;所以政府单位应订定相关法令、举办专业证照考试等制度,以使口腔卫生人员达到「教、考、用」之目标。
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As the raise of ammonia-N concentration, survival rate and daily growth of unexuviated larvae decreased gradually, while the metamorphosis rate and daily growth of exuviated larvae increased gradually firstly and then decreased. As the raise of sulfureted hydrogen concentration, all the parameters measured decreased gradually.
在本试验浓度范围内,随着氨氮浓度的升高,三疣梭子蟹各期幼体存活率和未变态个体的日生长率都逐渐降低,变态率和变态个体的日生长率则先逐渐升高,达到一个峰值后又逐渐降低;随着硫化氢浓度的升高,三疣梭子蟹各期幼体存活率和日生长率A均呈现逐渐降低趋势,变态率和日生长率B也逐渐减小。
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The GIBS scheme can raises the phase transformation temperature to 850℃ and the agglomeration temperature to 800℃.
而GIBS制程达到晶相转换温度850℃与结块温度800℃的效果,其热稳定性比未做Ge布植的矽化镍与高了100℃,猜测其原因为高浓度的Ge在矽化镍/矽的界面聚集,平衡了在界面上的应力,使得热稳定性提升,除此之外,从TEM图中还可发现Ge离子布植提升了矽化镍的界面平坦度。
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According to not complete count, a few this years chinese mainland website inbreaks bring about a webpage to be distorted twice grows;2007 year only 30 times the webpage distorts had been 2004, achieve 61228, this still does not include the number that was not shown by the government.
据不完全统计,这几年中国大陆网站入侵导致网页被篡改成倍增长;2007年仅网页篡改已经是2004年的30倍,达到61228,这还不包含未被官方披露的数字。
- 推荐网络例句
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Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".
歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车,和一双合并为一移交&整个lotta爱&。
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This is Kate, and that's Erin.
这是凯特,那个是爱朗。
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Articulate the aims, objectives and key aspects of a strategic business plan.
明确的宗旨,目标和重点战略业务计划。