共查询到20条相似文献，搜索用时 343 毫秒
1.
In this paper, we shall prove that the Marcinkiewicz integral operator μ, when its kernel satisfies the L1-Dini condition, is bounded on the Triebel-Lizorkin spaces. It is well known that the Triebel-Lizorkin spaces are generalizations of many familiar spaces such as the Lebesgue spaces and the Sobolev spaces. Therefore, our result extends many known theorems on the Marcinkiewicz integral operator. Our method is to regard the Marcinkiewicz integral operator as a vector valued singular integral. We also use another characterization of the Triebel-Lizorkin space which makes our approach more clear. 相似文献
2.
The Origin of Chinese New YearChinese New Year is popularly known as the SpringFestival. Its origin is too old to be traced. Although thereare many speculations about the origin floating around, allagree that the word "Nian," which means "year" in modernChinese, was the name of a beast that preyed on people onthe eve of the lunar new year.According to one legend, the beast Nian had a very bigmouth that could swallow a great many people all at once.Naturally, everyone was scared. One day,… 相似文献
3.
《今天．双语时代》2008,(12):80-81
During the Beijing Olympic Games, t was witnessed that Chinese athlets put on a successful performance and broke many records.Meanwhile, it was the same as the past Games that there were many great pities we have to keep in mind. Because of the hated competition of athletics, the Games took on the performance of perfection, as well as greatness of Pity. In a sense, the pity is one of the indispensable attractions of athletics.Actually, it is the pity that allows us to fully appreciate what a successful life is, 相似文献
4.
Metaphor is a common linguistic phenomenon and always realizes its value within a certain context.Metaphor uses words to indicate something different from their literal meaning-one thing is described in terms of another so as to suggest a likeness or analogy between them.A metaphor can easily be seen as a bridge which links and comprises the known and the unknown,the familiar and the unfamiliar.Some people hold that metaphor tends to be seen as a way of coloring the ordinary plain language.Meanwhile some people think that metaphor is regarded as a way of experiencing the world.An analysis on English and Chinese metaphor translation will help to strengthen our understanding of different languages as well as different cultures.This paper focuses on the structure and features of metaphor,correspondences and several techniques in metaphor translation. 相似文献
5.
This paper presents a pure vision based technique for 3D reconstruction of planet terrain. The reconstruction accuracy depends ultimately on an optimization technique known as ＇bundle adjustment＇. In vision techniques, the translation is only known up to a scale factor, and a single scale factor is assumed for the whole sequence of images if only one camera is used. If an extra camera is available, stereo vision based reconstruction can be obtained by binocular views. If the baseline of the stereo setup is known, the scale factor problem is solved. We found that direct application of classical bundle adjustment on the constraints inherent between the binocular views has not been tested. Our method incorporated this constraint into the conventional bundle adjustment method. This special binocular bundle adjustment has been performed on image sequences similar to planet terrain circumstances. Experimental results show that our special method enhances not only the localization accuracy, but also the terrain mapping quality. 相似文献
6.
With the development of reformation in China and the expanding of foreign exchanges,as the main composition of western culture,western festivals become a fashion in China.It has a special and far-reaching influence on our native festival culture and the young greatly.While many people especially young people celebrate western festivals,the Chinese traditional festivals seem fading out.This is an urgent problem that needs to be solved.This thesis is closely tracking the trend of the modern time and grasps this urgent and universal problem to conduct the research.On the basis of the investigation and analysis,this thesis aims to find out the underlying reasons of western festivals’ popularity in China and offer some sensible and effective corresponding countermeasures to this problem. 相似文献
7.
《英语辅导》2004,(2)
Israel is a nation rooted in religion. Its main religion, namely 1)Judaism, is thousands of years old. Israel is the only Jewish country in the world.The holy book of Judaism, the 2)Torah, is known as the Jewish Bible and contains many of the religious laws and the rules that Jews follow. 相似文献
8.
SONG Zeng-fu WU Tian-xing CAI Li-sheng ZHANG Li-jing ZHENG Xiao-dong 《Journal of Zhejiang University. Science. B》2006,(7)
INTRODUCTION It is well known that antibiotics are used as ef-fective agents to control diseases and as growth promoters in domestic animals. However, the con-tinuous use of antimicrobials increases the bacterial resistance. Therefore, it is essential to find effective and non-resistance replacements. Probiotics are vi-able cell preparations that have beneficial effects on health of the host by improving its intestinal balance (Fuller, 1989) via producing nutrients, enhancingimmune respo… 相似文献
9.
Someone once said that to open our minds,we must expose ourselves to many cultures,but this is not as easy as it sounds.I was born in Chile,a long, narrow country squeezed between the Pacific Ocean and the Andes Mountains.It is a place where the boiling weather welcomes the celebration of the nativity of 相似文献
10.
《Reading and Writing(初中版)》2007,(10)
It is well known that smoking is a dangerous habit because it causes health problems. Doctors say it can be a direct cause of cancer, of the lungs and throats and can also help to lead to cancer of other organs. In addition, it can bring about other health problems such as heart lung diseases. It is regarded as one of the chief causes of death in our society. 相似文献
11.
讨论了某些多线性积分算子在Triebel-Lizorkin空间和Lebesgue空间的有界性，这些算子包括了Littlewood-Paley算子、Marcinkiewicz算子和Bochner-Riesz算子. 相似文献
12.
The nonlinear Riemann problems were converted into nonlinear singular integral equations and the existence of the solution for the problem was proved by means of contract principle. 相似文献
13.
Carol E. Seaman Jennifer Earles Szydlik 《Journal of Mathematics Teacher Education》2007,10(3):167-182
This study explores the ways in which eleven preservice elementary teachers used a web-based teacher resource to apply a mathematical
definition, to correct a procedural error in arithmetic, and to make sense of a story requiring the multiplication of fractions.
In our analysis we propose a framework to compare the behaviors and values expressed by our participants with the values and
norms of the mathematical community. This analysis suggests that many preservice elementary teachers are profoundly mathematically
unsophisticated. In other words, they displayed a set of values and avenues for doing mathematics so different from that of
the mathematical community, and so impoverished, that they found it difficult to create fundamental mathematical understandings. 相似文献
14.
Supersaturated solid solutions Fe1-xCx （0≤x≤0.9 ） of wide composition range have been prepared by mechanical alloying process. Nanocrystalline phase was formed for 0 ≤ x ≤ 0.67 and a large grain phase for 0.75 ≤ x ≤ 0.9. The large fraction of graphite volume puts off formation of nanocrystalline phase for high carbon content. In the large grain phase, magnetization follows simple magnetic dilution, and eoereivity He is mainly due to dissolution of carbon at grain boundaries. In the nanocrystalline phase the alloying effect of carbon is revealed by a distinct reduction of average magnetic moment. The increasing lattice constant with increasing carbon content is observed for x ≤ 0.5, suggesting that the high carbon concentration may enhance diffusion of carbon into the Fe lattice. It shows a discontinuity in the Hc variation with a grain size D of nanocrystalline phase. For small grain D below the critical value, Hc increases with D. For a large grain D, Hc decreases with increasing D. The solubility limit of carbon in a-Fe extended by nanocry- stalline phase formation is discussed. 相似文献
15.
Software has been developed for digital control of WDW series testing machine and the measurement of fracture toughness by modularized design. Development of the software makes use of multi-thread and serial communication techniques, which can accurately control the testing machine and measure the fracture toughness in real-time. Three-point bending specimens were used in the measurement. The software operates stably and reliably, expanding the function of WDW series testing machine. 相似文献
16.
ZHAO Li-li 《浙江大学学报(A卷英文版)》2007,8(6):957-962
In this paper, we consider some polynomial (α,β)-metrics, and discuss the sufficient and necessary conditions for a Finsler metric in the form F=α a1β a2β2/α a4β4/α3 to be projectively flat, where ai (i=1,2,4) are constants with a1≠0, α is a Riemannian metric and β is a 1-form. By analyzing the geodesic coefficients and the divisibility of certain polynomials, we obtain that there are only five projectively flat cases for metrics of this type. This gives a classification for such kind of Finsler metrics. 相似文献
17.
Ｉｎ 1935 ,Ｐ .Ｅｒｄ¨ｏｓａｎｄＧＳｚｅｋｅｒｅｓｏｂｔａｉｎｅｄｔｈｅｃｌａｓｓｉｃａｌｉｎｅｑｕａｌｉｔｙＲ (ｍ ,ｎ)≤Ｒ (ｍ - 1,ｎ) Ｒ(ｍ ,ｎ - 1) . Ｉｎ 196 8,Ｋ .ＷａｌｋｅｒｐｒｏｖｅｄｔｈａｔＲ(ｎ ,ｎ)≤ 4Ｒ(ｎ- 2 ,ｎ) 2 . Ｉｎ 1998,ＨｕａｎｇＹ .Ｒ .ａｎｄＺｈａｎｇＫ .Ｍ .[1,2 ] ｐｒｏｖｅｄｔｈａｔＲ(ｍ ,ｎ)≤ 12 (β 3γ 5 ) 12 γ(4α 2 β - 3γ 6 ) (β 1) 2 Ｉｎｔｈｉｓｐａｐｅｒ ,ｗｅｏｂｔａｉｎｓｏｍｅｎｅｗｕｐｐｅｒｂｏｕｎｄｓｆｏｒＲ(ｍ ,ｎ ,ｌ)ａｎｄＲ(ｍ … 相似文献
18.
19.
Andrea English 《Zeitschrift für Erziehungswissenschaft》2005,8(1):28-37
Zusammenfassung
Negativit?t und das Neue in John Deweys Theorie vom Lernen und der Demokratie — Für einen erneuten Blick auf Lernkulturen
Die Rolle des Neuen in Lernprozessen bezieht sich auf die grundlegende Frage, wie Lernen überhaupt m?glich ist und wo es beginnt.
In diesem Beitrag wird zun?chst John Deweys Lernkonzeption als Basis für die Analyse entwickelt. Dann wird die Beziehung zwischen
Negativit?t und dem Neuen erarbeitet. Beim übergang vom Alten zum Neuen und vom Gewussten zum Ungewussten entstehen Verwirrungen
und Schwierigkeiten, die in diesem Papier als Negativit?t im Lernprozess untersucht werden. Au?erdem vermittelt der Beitrag
Einsichten in praktische p?dagogische Probleme, etwa bezüglich der Frage, wie Lehrer und andere Erzieher Lernprozesse f?rdern
und wie Lernkulturen als besondere Lernumwelten Lehr-Lern-Prozesse unterstützen k?nnen.
Negativity and the new in John Dewey’s theory of learning and democracy Toward a renewed look at learning cultures
Summary The role of the New in learning processes relates to basic questions of how learning is possible, and where learning begins. Using John Dewey’s concept of learning as the basis for analysis, this inquiry looks into the relation between Negativity and the New and seeks to uncover the negativity in learning processes associated with the perplexities and difficulties which arise in the transitions from Old to New and Known to Unknown. Furthermore, it offers insight into practical pedagogical issues, such as how teachers and educators can support learning processes and how learning cultures, as particular environments for learning, can assist processes of teaching and learning.相似文献