Modeling ExB drift transport in conceptual slot divertor configurations

At DIII-D, a slot divertor concept, called small-angle-slot (SAS), is under development, aiming to enable detachment at relatively low plasma edge density. We report on simulations using the SOLPS-ITER two-dimensional edge code to examine the performance of conceptual “SAS 2” slot configurations. The focus of the analysis is on E  ×  B drift effects on upstream density at detachment (UDD), with detachment marked by electron temperature T_e ≤ 3 eV at the outer strike point (OSP). With toroidal field such that radial E  ×  B drift carries particles from the OSP towards the private flux region (PFR), placing the OSP near the inner slot wall gives ≈20% lower UDD than having the OSP near the outer wall. The inner wall effectively traps the radial E  ×  B drift flux, resulting in low T_e and associated radial electric field in the PFR, and thus small losses from the slot to the inner target via poloidal E  ×  B drift flux. With toroidal field reversed such that radial E  ×  B drift is reversed, OSP placement near the inner wall gives ≈10% lower UDD than OSP placement near the outer wall. Although radial E  ×  B flux is from the OSP towards the outer wall, this flux largely escapes the slot, raising the UDD. A change in the slot shaping is suggested with the goal of eliminating such E  ×  B -driven particle losses from the slot.     

基于集群的高频合成孔径声纳并行处理方法

大测绘带下的高频合成孔径声纳需要解决的主要问题是海量数据的实时处理。该问题对数据处理的计算平台、成像处理和架构提出了很高的要求。本文利用非均匀离散快速傅里叶变换改进了成像算法,使之能够适应采用了多子阵技术的合成孔径声纳;提出了高频合成孔径声纳信号并行处理方法,在集群上实施了该方法,并进行了湖试试验。实时成像结果表明,改进的并行处理方法可以满足分辨率为距离向4cm、方位向5 cm,测绘带宽为200m的高频合成孔径声纳实时成像要求,具有较高的稳定性。     

关于数据分析方法及SAS软件教学的探索

论述了在大学本科阶段开设数据分析方法及其应用软件选修课的必要性及可能性 ,并介绍了笔者自 1 996年以来给本校信息与计算科学系三年级本科生开设该课程的情况及收获和体会 .     

非参数逐步判别分析在脑中风分类诊断中的应用

本文采用不等带宽核密度估计的非参数逐步判别分析,使用SAS软件,对复旦大学附属中山医院78例脑中风样本病例,科学地进行了脑出血、脑缺血的分类诊断。经交叉证实法得判别正确率为:脑出血87 88%、脑缺血88 89%,总判别正确率88 46%,判别效果良好。应用78例训练样本建立的判别函数,在苏州大学附属医院2002年42例脑中风病人的分类诊断中,取得了成功的实际应用效果。     

A proposal for a variation on the axioms of classical geometry

A set of axioms for classical absolute geometry is proposed that is accessible to students new to axioms. The metric axioms adopted are the ruler axiom, triangle inequality and the bisector axiom. Angle measure is derived from distance, and all properties needed to establish a consistent system are derived. In particular, the SAS congruence theorem is proved. The proofs are broken into many small steps suitable for the target audience. Some explorations with geometry drawing programmes are shown.     

关于“SAS软件包中Fisher精确检验方法的分析”一文的争鸣意见

本文对ＳＡＳ软件包中精确概率的算法与一般统计学教科书有较大差别的问题提出了个人看法。认为在一般情况下根据ＳＡＳ软件包给出的双尾概率作出双侧检验结论时应取慎重态度     

Process optimization studies of 10-Hydroxycamptothecin (HCPT)-loaded folate-conjugated chitosan nanoparticles by SAS-ionic crosslink combination using response surface methodology (RSM)

10-Hydroxycamptothecin (HCPT) is a well-established topoisomerase I inhibitor of a broad spectrum of cancers. However, poor aqueous solubility, low instability, and toxicity to normal tissues have limited its clinical development. A novel HCPT-containing drug carrier system was developed to overcome these disadvantages. The response surface methodology was used to optimize the process of preparing HCPT-chitosan nanoparticles (HCPT-CSNPs) by the SAS-ionic crosslink (supercritical antisolvent SAS) combination method; the resulting HCPT-CSNPs were then conjugated with folate for specific targeting. A central composite design, composed of four independent variables, namely, chitosan concentration, TPP concentration, HCPT nanoparticle concentration, and crosslink time, was applied in the modeling process. The mean particle size and drug entrapment efficiency (DEE) of HCPT-CSNPs were chosen as response variables. The interactive effects of the four independent variables on the response variables were also studied. Nanoparticle characteristics such as morphology, DEE, and mean particle size were investigated. The optimum conditions for preparing HCPT-CSNPs were determined as follows: folate-coupled chitosan concentration 2.46 mg/ml, TPP concentration 7.73 mg/ml, HCPT nanoparticle concentration 0.48 mg/ml, and crosslinking time 47.4 min. Optimum conditions for preparing desired HCPT-CSNPs with a mean particle size of 173.5 nm and entrapment efficiency of 77.3% were obtained. The resulting folate-conjugated HCPT-CSNPs (FA-HCPT-CSNPs) reveal that the amount of folate conjugation was 197.64 mg/g CS. FA-HCPT-CSNPs used in drug carrier systems could have potential value in HCPT-sensitive tumors.     

套设计的多元分析

本文阐述了二阶套设计的多元分析方法 ,同时给出了其 SAS程序 .最后 ,讨论了 SAS过程中means语句随模型的不同而变化的规律 .     

生成SAS数据集的几种方法

高惠璇，生成ＳＡＳ数据集的几种方法，数理统计与管理，１９９８，１７（３），４９～５４．本文介绍生成ＳＡＳ数据集几种不同的方法。     

一种基于血氧饱和度与鼾声检测的呼吸暂停监测系统设计

长期打鼾严重的人往往都患有呼吸暂停综合征, 该症状对人的身体健康有着极大的危害. 针对用鼾声实现呼吸暂停检测技术准确度不够的问题, 设计了一种基于血氧饱和度与鼾声检测相结合的呼吸暂停监测系统, 利用微控制器结合外部的血氧检测电路以及鼾声检测电路实现血氧饱和度的实时监测与鼾声片段的识别, 当监测到用户睡眠时正在打鼾同时血氧饱和度在一定程度上下降, 系统便可以识别出该打鼾者的呼吸暂停症状. 而对于患有呼吸暂停症状的打鼾者, 后续可以对其进行止鼾, 从而一定程度上可以缓解呼吸暂停症状. 整个系统在准确实时的血氧饱和度监测以及鼾声识别基础上, 可以较为方便准确地识别出打鼾者的呼吸暂停症状, 为呼吸暂停综合征的实时监测提供了一种新的方法.