掺杂Eu~(3 )的磷钨酸钠玻璃的合成及发光特性

本工作采用高温固相反应法合成掺杂１％Ｅｕ３＋离子的不同Ｐ２Ｏ５／ＷＯ３比例的磷钨酸钠玻璃，测定３９４ｎｍ和４６４ｎｍ激发下的荧光光谱，探讨了掺杂Ｅｕ３＋离子的磷钨酸钠玻璃的发光特性．     

寡聚糖激发子诱导杨树抗溃疡病的生化机制

用已筛选的3种寡聚糖激发子A1、B、C3分别诱导毛白杨愈伤组织,以加无菌水为对照,并在诱导48 h后挑战接种杨树溃疡病菌,测定毛白杨愈伤组织中苯丙氨酸解氨酶、几丁质酶和抗坏血酸氧化酶活性的变化。结果表明,3种寡聚糖激发子A1、B、C3诱导48 h后接种杨树溃疡病菌,毛白杨愈伤组织中苯丙氨酸解氨酶和几丁质酶活性均呈单峰曲线变化,并且变化趋势基本上满足:A1>B>C3>CK(对照接种),而抗坏血酸氧化酶活性的变化为:在发病初期和中期(0-48 h)诱导接种毛白杨愈伤组织均高于对照接种,而在发病后期(t>48 h)对照接种毛白杨愈伤组织高于诱导接种,因此,可以得出寡聚糖激发子A1的诱导抗病性比寡聚糖激发子B和C3都强。     

浅裂纹试样塑性位移与载荷关系的实验标定

本文用实验验证了对于两种中强度，低韧性的材料１８ＭｎＭｏＮｂ１０ＭｎＭｏＮｂｖｃＵ，Ｅｒｎｓｔ分离函数原理Ｐ＝σ０Ｂｂ＾２Ｗｇ（ａ／Ｗ）Ｈ（ΔＰ／Ｗ）仍适用，并由此用实验标定了两种材料的浅裂纹试样的ｇ（ａ／Ｗ）表达式，在此基础上，得到了浅裂纹试样塑性位移与载荷的函数关系式。     

2,3,4─三羟基─4'─磺基─偶氮苯的电还原及其在电分析中的应用

２，３，４─三羟基─４＇─磺基─偶氮苯的电还原及其在电分析中的应用该文作者为化学系徐茂田和河南师大化学系汪振辉、周漱萍，文章被收录于第２届国际分析化学学术会议论文集《ＴＨＳＥＣＯＮＤＣＨＡＮＧＣＨＵＮＩＮＴＥＲＮＡＴＩＯＮＡＩ．ＳＹＭＰＯＳＩＵＭＯＮ...     

如何回答“为什么”

如何回答“为什么”ＲＵＨＥＨＵＩＤＡＷＥＩＳＨＥＮＭＥ●刘泽民一、高考试题往往以“为什么”提问１９９４年高考历史试题，３大问题就有２个问题用“为什么”提问：中、法启蒙思想作用为什么不同的问题；恩格斯为什么修正原先结论的问题。１９９５年高考历史试题，３...     

Cache技术及应用

这几年，ＣＡＣＨＥ技术被广泛应用．ＣＡＣＨＥ实际上就是一种高速缓冲存储器，现在ＣＰＵ的速度比主存的速度愈来愈快，如果ＣＰＵ直接对主存访问，将减小的效率，则将大的较慢的主存与小的较快ＣＡＣＨＥ的存储器放在一起．ＣＡＣＨＥ内存的目的是将内存速度提高到最快，同时以较低的价格提供较大的内存空间的半导体存储器．     

化学发光法测定人血中的微量铬

本文介绍了人血中微量铬的化学发光测定法，并讨论了酸度、共存离子、测定时间等因素对测定结果的影响及适合于ｌｕｍｉｎｏｌ—Ｈ２Ｏ２－Ｃｒ（Ⅲ）体系进行发光测定的条件。该法具有灵敏度高、精密度好、选择性好、良好的线性关系等特点，对不同人血样品进行了发光测定及回收率试验，结果令人满意。     

几种水果抗氧化性能的比较分析

对几种水果抗氧化性能进行分析。采用流动注射化学发光法,对影响抑制率的因素邻苯三酚浓度、鲁米诺的浓度、缓冲溶液的pH值等进行了条件实验,确定出最佳条件。结果表明：几种水果能有效地抑制超氧阴离子自由基诱导的鲁米诺化学发光,随着发光体系中水果含量的升高,发光强度呈下降趋势即具有较强的抗氧化性能,对几种水果的抗氧化性能进行了比较。     

含标量场的kaluza-klein理论

本文建立了纤维丛Ｐ２（Ｐ１（Ｍ，Ｕ（１）），Ｕ（１））．求得了含标量场的ｋａｌｕｚａ－ｋｌｅｉｎ理论的作用量，给出了标量场一种新的几何解释．     

钌(Ⅱ)—联吡啶化学发光体系测定糖中的亚硫酸盐及大气中的二氧化硫

用钌（Ⅱ）—联吡啶—ＫＢｒＯ３（Ｒｕ（ｂｉｐｙ）２＋３－ＫＢｒＯ３）化学发光体系与Ｒｕ（ｂｉｐｙ）２＋３－ＫＭｎＯ４化学发光体系测定亚糖中的亚硫酸盐及大气中的二氧化硫,从五个方面作了讨论并与其它化学方法进行比较。实验表明Ｒｕ（ｂｉｐｙ）２＋３发光体系比其它方法具有更高的灵敏度和较宽的线性范围,且Ｒｕ（ｂｉｐｙ）２＋３－ＫＢｒＯ３发光体系略优于Ｒｕ（ｂｉｐｙ）２＋３－ＫＭｎＯ４发光体系。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.