第五届全国动力学与控制青年学者学术研讨会介绍

为了深入交流我国动力学与控制学科近年来已取得的成果,探讨学科的发展趋势和面临的挑战,促进青年学者之间的交流与合作,加深青年学者对履行历史使命的责任感,由国家自然科学基金委员会数理科学部发起,国家自然科学基金委员会数理科学部和中国力学学会动力学与控制专业委员会联合主办,由青岛大学信息工程学院承办的“第五届全国动力学与控制青年学者学术研讨会”于2011年7月28日至30日在美丽的海滨城市青岛召开,中国力学学会常务理事张伟教授担任会议主席,青岛大学信息工程学院丁洁玉副教授负责会议组织工作。      

2012年度力学科学处面上项目、青年科学基金和地区科学基金资助情况介绍

经力学专家评审、数理科学部工作会议及基金委员会委务会审议,2012年度力学科学处面上项目、青年科学基金和地区科学基金资助项目已确定（见附表1）.现将有关信息公布如下：（1）国家自然科学基金委员会目前已确立了研究项目、人才项目和环境条件项目3个项目资助系列.这3个资助项目系列的定位各有侧重,相辅相成,构成了国家自然科学基金资助格局.面上项目属于研究项目系列,以获得科研创新成果为主要目的,并通过创新性科学研究培养科技人才,促进学科均衡、协调和可持续发展,     

Triterpenoids and lignans from the stems of Schisandra glaucescens

Two new triterpenoids, 24(E)-3α,12α-dihydroxyl-lanost-9(11),24-dien-26-oid acid (1) and 3,4-seco-24(Z)-6α,7β-dihydroxyl-cycloart-4(28),24-dien-3,26-dioic-3-methyl ester (2), and ten known ones (3–12), together with eight lignans (13–20), were isolated from the stems of Schisandra glaucescens. Their structures were established on the basis of extensive spectroscopic analyses. Compounds 1–3, 5–7, 9, 11–13 and 15–18 were isolated from this species for the first time. 1 and 2 were evaluated for their in vitro cytotoxicities against the mouse cancer B16 cell line, human cancer HepG2 and MCF7 cell lines by MTT assay.     

Experimental and numerical study of the evolution of soot primary particles in a diffusion flame

The evolution of primary soot particles is studied experimentally and numerically along the centreline of a co-flow laminar diffusion flame. Soot samples from a flame fueled with C₂H₄ are taken thermophoretically at different heights above the burner (HAB), their size and nano-structure are analysed through TEM. The experimental results suggest that after inception, the nascent soot particles coagulate and coalesce to form larger primary particles (?～?5 to 15 nm). As these primary particles travel along the centreline, they grow mainly due coagulation and condensation and a layer of amorphous hydrocarbons (revealed by HRTEM) forms on their surface. This amorphous layer appears to promote the aggregation of primary particles to form fractal structures. Fast carbonisation of the amorphous layer leads to a graphitic-like shell around the particles. Further graphitization compacts the primary particles, resulting in a decrease of their size. Towards the flame tip the primary particles decrease in size due to rapid oxidation. A detailed population balance model is used to investigate the mechanisms that are important for prediction of primary particle size distributions. Suggestions are made regarding future model development efforts. Simulation results indicate that the primary particle size distributions are very sensitive to the parameterization of the coalescence and particle rounding processes. In contrast, the average primary particle size is less sensitive to these parameters. This demonstrates that achieving good predictions for the average primary particle size does not necessarily mean that the distribution has been accurately predicted.     

Comparison study of photon attenuation characteristics of Lead-Boron Polyethylene by MCNP code,XCOM and experimental data

The linear attenuation coefficient, mass attenuation coefficient and mean free path of various Lead-Boron Polyethylene (PbBPE) samples which can be used as the photon shielding materials in marine reactor have been simulated using the Monte Carlo N-Particle (MCNP)-5 code. The MCNP simulation results are in good agreement with the XCOM values and the reported experimental data for source Cesium-137 and Cobalt-60. Thus, this method based on MCNP can be used to simulate the photon attenuation characteristics of various types of PbBPE materials.     

力学科学处2010年重点项目结题审查情况的简要介绍

按照《国家自然科学基金重点项目管理办法》的有关规定:自然科学基金委应当自收到结题材料之日起90日内,组织同行专家对重点项目的完成情况进行审查. 为了促进重点项目之间的交流, 加强对比, 提高效率,数理科学部于2011年3月15日至16日在北京召开会议组织专家对2010年结题的重点项目进行了集中审查,会议采取分学科进行的方式. 力学科学处共有10项重点项目进行了结题审查(见表1).各项目负责人就研究计划的完成情况、取得的成果及水平, 以及人才培养, 国际合作与交流的成效等进行了汇报.评审专家进行了认真讨论, 形成了结题审查专家组评价意见.      

2011年度力学科学处基金项目受理情况介绍

为便于力学科研人员及时了解2011年度基金项目申请信息,现将数理科学部力学科学处受理的面上项目、青年基金项目、地区基金项目、重点项目、国家杰出青年科学基金和海外及港澳学者合作研究基金项目的申请情况做一介绍.      

关于某类带小周期参数的方程的数值解法

In this paper,we propose a numerical method for the point boundary value problem with small periodic structure.we give error estimates and numerical example.     

脉冲平面波斜入射旋转对称体电磁散射的FDTD算法

提出一种应用时域有限差分算法求解脉冲平面波斜入射时旋转对称体散射问题的方法.对斜入射脉冲平面波在圆柱坐标系下进行分解、应用总场/散射场连接边界、PML吸收边界条件.通过与矩量法分析结果的比较,验证了该方法的有效性.     

ICP-AES雾化法氢化法联合同时测定人血清中三十种元素

本文探讨了用ICP-AES雾化法氢化法联合同时测定人血清中三十种元素的方法。本法最低检出量基本满足血清样品的测定要求。方法回收率在95—105%之间,重复测定的相对误差小于5%。对于探索血清元素含量与疾病的关系及临床诊断有一定价值。