Pointwise estimates for the maximal multilinear singular integral operators

Two pointwise estimates relating the maximal multilinear singular integral operators and some classical maximal operators are established. These pointwise estimates imply the rearrangement estimate and the BLO(Rn) estimate for the maximal multilinear singular integral operators.     

Some results on numerical divided difference formulas

The remainder estimates of numerical divided difference formula are given for the functions of lower and higher smoothness, respectively. Then several divided difference formulas with super-convergence are derived with their remainder expressions.     

Discrete large eddy simulation

IntroductionIn previous worksll,2], we discussed several issues associated with the standard version oflarge eddy simulation (LES) such as filtering and averaging. By the standard version, we meanthe traditional practice of first constructing a set of field equations of motions for turbulentmotion and then discretizing the equations to suit computational simulations.In this paper, we revisit the issue of large eddy simulation with a view towards improvingthe filtering procedure that is used i…     

Design and Analysis of Diffractive Axicons for Gaussian Beam Illumination

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｒｅｃｅｎｔｌｙｔｈｅｒｅｈａｓｂｅｅｎｃｏｎｓｉｄｅｒａｂｌｅｉｎｔｅｒｅｓｔｉｎｄｅｓｉｇｎａｎｄａｎａｌｙｓｉｓｏｆｔｈｅｄｉｆｆｒａｃｔｉｖｅａｘｉｃｏｎｓｔｈａｔｐｒｏｄｕｃｅａｆｏｃａｌｓｅｇｍｅｎｔｗｉｔｈｎｅａｒｌｙｕｎｉｆｏｒｍｏｐｔｉｃａｌｉｎｔｅｎｓｉｔｙａｌｏｎｇｔｈｅｓｙｓｔｅｍａｘｉｓｗｉｔｈｉｎａｓｐｅｃｉｆｉｅｄｒｅｇｉｏｎｂｅｈｉｎｄｔｈｅｅｌｅｍｅｎｔ[1～1 2 ] .Ｔｈｉｓｉｓｄｕｅｔｏｔｈｅｉｒｕｎｕｓｕａｌｐｒｏｐｅｒｔｉｅｓａ…     

A New Taxane Diterpenoid from the Seeds of Taxus yunnanensis

Plant from the genus of Taxus are a rich source of biologically active diterpennodsbelonging to the unique structural family of taxoids'. Although more than 300 taxoidswere isolated from yew tree', new taxoids still were isolated. In our continuing studieson the yew tree, we have previously isolated several new taxoids from seeds of theChinese yew, Taxus chinensiS var mairei. T yunnanensiS, and Japanese yew, TCuspidata'-'. Further investigation on the extract of the seeds of T yunnanensis …     

聚苯胺-改性木质素磺酸钠复合材料基活性炭负载Pd催化剂对甲酸氧化的催化性能

将聚苯胺/改性木质素磺酸钠复合材料在不同炭化温度下进行处理得到活性炭材料，利用红外光谱、拉曼光谱、比表面积分析和扫描电镜等手段对其结构和表面性质进行了表征。通过液相还原方法将Pd纳米颗粒负载在所制备的活性炭材料上，获得Pd/C催化剂用于甲酸氧化，并采用X射线衍射、透射电镜和电化学测试等方法对该Pd/C催化剂进行表征。结果表明，以800℃下炭化得到的活性炭材料为载体所制备的Pd-AC800催化剂其催化性能最优；Pd粒径为5.4 nm，电化学活性面积为53.78 m²/g。由于在该催化剂上甲酸氧化通过直接途径进行，Pd-AC800可用作直接甲酸燃料电池的催化剂。     

大白鼠脑中风模型的核磁共振成像(英文)

核磁共振成像现今已经成为临床神经影像的常规工具.在诊断、评估和监测中风从急性到慢性的各个阶段的脑组织的变化过程中,核磁共振成像扮演了一个重要的角色.该综述提供了多种核磁共振成像方法的描述,以及选择性地展示了作者在美国亨利福特医院神经科核磁共振成像实验室所获得的大白鼠栓塞中风模型的核磁共振成像研究成果.     

2015年度《理化检验-化学分册》杂志征订启事

<正>《理化检验-化学分册》杂志创刊于1963年,系由上海材料研究所与机械工程学会理化检验分会联合主办的技术类刊物。主要报道材料的化学分析与仪器分析专业领域中的新方法、新技术、新设备以及国内外的研究方向。"面向生产、注重实用、反映动向、兼顾普及"是刊物的编辑方针,旨在最大幅度地满足不同层次     

Expanding and calculation of high-order uncommutation operators

A general method has been suggested for expanding the high-order uncommutation operators and developing several formulations of their series expression. Then the expanding and calculation of Poisson bracket which consist of high-order operations should be more convenient and direct.     

SHOCK COMPRESSION BEHAVIOR OF BROMOFORM

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