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以《黄金率与五重对称》为开端,《物体的形状与黄金率》进一步阐述了现实生活中多边形结构占主要形式的理由（层次结构定理）,如,黄金率出现在许多建筑物和绘画作品中（美学定理）等。本文是前述研究的延续,目的在于揭示关于金字塔和其他神圣建筑物数据方面的许多错误推测。这里我们以同样的思想来诠释关于或者黄金率或者等极其美好的数据的错误推测。研究的成功在于仔细探求了许多金字塔的数据,而不只是研究最大的一个金字塔的数据。前半部分是不关联数,后半部分我们致力于二次域上的黄金分割率．并以一种简单易懂的方式,给出了许多代数数论中的记号和结果。我们认为读者具备（代数）数论的初步知识。有关这方面的详细内容,读者可参阅即将出版的书《数论与代数》。 相似文献
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With the fast development of acoustic systems in clinical and therapeutic applications, acoustically driven microbubbles have gained a prominent role as powerful tools to carry, transfer, direct, and target drug molecules in cells, tissues, and tumors in the expanding fields of targeted drug delivery and gene therapy. The aim of the present study is to establish a biocompatible acoustic microfluidic system and to demonstrate the generation of an acoustic field and its effects on microbubbles and biological cells in the microfluidic system. The acoustic field creates non-linear oscillations of the microbubble-clusters, which results in generation of shear stress on cells in such microsystems. This effectively helps in delivering extracellular probes in living cells by sonoporation. The sonoporation is investigated under the combined effects of acoustic stress and hydrodynamic stress during targeted drug and gene delivery. 相似文献
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R. K. Mittal Archana Baghel Anjali Chakraborty R. Baveja 《Indian journal of clinical biochemistry : IJCB》1989,4(1):65-69
A clinical study was carried out on an antiprogestin, a synthetic steroid, 17 Hyroxy-11 β-(4-dimethyl amino-phenyl-1)—17 (Prop-1-ynyl-estra—4,
9, dien-3-one) for the termination of pregnancies in female subjects within 14 days of missed menstrual period and with positive
urine pregnancy test (Gravindex Test). The compound was tested for its efficacy as an abortifacient and its acceptance by
human subjects was assessed by measuring various biochemical parameters before and after introduction of the drug. The parameters
measured in the subjects included, fasting blood sugar, blood urea, SGOT, SGPT, serum alkaline phosphatase, serum bilirubin,
serum creatinine, serum proteins, A/G ratio and serum Na+, K+. Statistically insignificant variation was noted in all the parameters studied. This clearly shows that the drug is very
well accepted by human subjects. 70% of the subjects tested in the pilot study aborted within 4 days of introduction of the
drug. Overall, 90% of the subjects tested aborted as a result of introduction of the drug. 相似文献
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Arnab Chakraborty 《Resonance》2002,7(5):66-75
We describe the mathematics behind the Markov Chain Monte Carlo method of simulation. 相似文献
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Pal R Chakrabarti K Chakraborty A Chowdhury A 《Journal of Zhejiang University. Science. B》2005,6(8):756-758
INTRODUCTION Pencycuron [1-(4-chlorobenzyl)-1-cyclopentyl- 3-phenylurea], a relatively new non-systemic protec-tive fungicide for controlling sheath blight (Rhizoc-tonia solani) of rice (Sylvanie and Cornis, 1989; Tomlin, 1997), is expected to be used widely in ag-ricultural production particularly in Asia. However, information on the dissipation pattern of pencycuron in rice plant is lacking. Little information on the en-vironmental fate of pencycuron has been published although there … 相似文献
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Qualitative analysis of unknown organic compounds is an essential part of the core curriculum for BSc and MSc students in chemistry. The functional group detection is a significant component of qualitative analysis. The present work describes the reason for the failure of Mulliken-Barker test for nitro compounds having carboxylic acid functionality and suggests a possible remedy. 相似文献