共查询到20条相似文献，搜索用时 61 毫秒
1.
李洁 《温州职业技术学院学报》2002,2(3):32-32,44
应用薄层扫描法测定孩儿茶中消旋儿茶素的含量，方法简便，重现性好，结果准确。在4．0－8．0μg/ml范围内呈线性关系，r=0．9992。回收率为99．6％－102．8％，RSD为1．2％－4．2％。 相似文献
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《中国高等教育评估》2005,(1):59-60
领导干部对2004年中国社会形势的总体评价是：8．4％的人认为“非常好”，60．7％的人认为“比较好”，22．4％人认为“一般”．75％的人认为“不太好”，另外有0．9％的人表示“说不清”。认为“非常好”和“比较好”的合计占69.1％。值得重视的是，与前两年的调查相比，领导干部对2004年社会形势的评价要低一些。根据“非常好”和“比较好”两者合计所占比例，东部沿海地区干部(71．5％)高于中部地区干部68.9％和西部地区干部(66．7％)。 相似文献
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高效薄层光密度法测定牛黄解毒丸中大黄素的含量 总被引：1，自引：0，他引：1
库尔班江 《伊犁师范学院学报》2003,(1):98-100
在硅胶高效薄层色谱板上，采用双波长薄层扫描法测定了牛黄解毒丸中大黄素的含量．本法快速简便，方法可靠，重现性好，平均回收率为98．93％，变异系数为0．72％． 相似文献
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本研究植酸及其钠、钾盐对荔枝果实的保鲜效果试验。结果表明，用量为0．2％植酸钠或钾盐、0．1％多菌灵的溶液经0．5％的油酸钠或海藻酸钠乳化后浸泡当天采的荔枝果实15至30秒，室温晾干，用聚乙烯薄膜袋包封。在日均气温29℃至33℃，相对湿度64％至88％之间变化的第七天内，荔枝果色保鲜率平均为95．36％，空白试验则为75．8％，随后的5天日均气温为26．8℃之间变化的第七天内，荔枝果色保鲜率平均为95．36％，空白试验则为75．8％。随后的5天日均气温为26．8℃至31．4℃，相对湿度72％至79％，则荔枝果色保鲜率平均达到77．3％，空白试验则为0。经此试验的荔枝果实，好果果壳仍呈鲜红色，果肉完整，鲜甜味不变。 相似文献
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刘桂琼 《黔东南民族师专学报》2004,22(6):47-49
应用AFS-2202E型双道原子荧光光谱法研究了化妆品中汞的测定技术，用温式催化法消化样品，样品处理好后，以KBH42％为还原剂，5％HCI为载流溶液，在优化工作条件下测定汞，汞的最低检出量为0．0125μg／L．用此方法测定化妆品的汞，灵敏度高，准确度好，结果满意． 相似文献
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双波长分光光度法测定油菜蜂花粉中总黄酮的含量 总被引：6，自引：0，他引：6
介绍了一种双波长分光光度法，应用于测定油菜蜂花粉中的总黄酮含量，测定波长510nm，参比波长584nm，平均回收率98．2％，RSD=1．23％(n=5)．结果表明，青海产油菜蜂花粉中总黄酮平均含量为3.22％．该方法稳定可靠，重现性好． 相似文献
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目的：建立用高效液相色谱法同时测定果脯佛手中甘草苷和甘草酸含量的方法．方法：采用LiChmspher RP—C18色谱柱，以乙腈-水（1．2％甲酸）为流动相，梯度洗脱，检测波长254nm．结果：甘草苷在0．21-3．15μg范围内呈良好的线性关系，回归方程为Y=1053．9644X-0．0528（r=0．9999），平均回收率为99．7％，RSD为1．72％（n=9），重复性RSD为0．14％；甘草酸铵在0．25—6．25μg范围内呈良好的线性关系，回归方程为Y=1311．3875X-14．3144（r=0．9998），平均回收率为100．8％，RSD为1．31％（n=9），重复性RSD为0．40％．结论：方法操作简便，结果可靠，重现性好． 相似文献
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采用高效薄层色谱双波长扫描法对青风藤中青藤碱的含量进行了测定，此法简便快速，重现性好，稳定性高，数据可靠，平均回率为99．77％，变异系数为1．28％。 相似文献
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从心理健康测查的局部看心理健康教育 总被引：1，自引：0，他引：1
才果 《青海师范大学民族师范学院学报》2005,16(2):45-47
本研究采用周步成（MHT-RC）问卷，对青海省海南州的1500名中小学生，进行心理健康问卷测查。结果表明：（1）心理健康的学生占总被试的81．87％。其中，民族生和普通生，分别占35．18％和64．8％。（2）心理不健康的学生占总被试的18．13％。其中，民族生和普通生，分别占62．87％和37．13％，总之，心理健康的学生占绝大多数。并且心理健康水平，初中生好于小学生，小学生好于高中生：而普通生又好于民族生。但心理不健康的学生客观存在，尤其是民族生和高中生比率较高。笔者对此提出理性思考。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
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? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
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. 相似文献