复杂曲面数控自动编程中自由曲面描述新方法

长期以来,因为反求算法的困扰,Bezier曲面模型一直难于在复杂曲面的数控自动编程中得到应用。本文解决了Bczier曲面模型的这一缺陷,使共计算和处理都非常方便,这种便利在曲面的求交、显示、加工等操作中,具有特殊的意义。     

Deep sea pollen record during 12－1.6 Ma from the southern South China Sea and its response to envi-ronmental change

Based on deep-sea pollen results (512-76 m) from ODP Site 1143 in the southern South China Sea (SCS),the climate and vegetation evolution sequence on the surrounding islands and the exposed continental shelf are discussed. The pollen records show that the pollen influx was quite low before 8.15 Ma and increased dramatically afterwards. The influx changes can be ascribed,on one side,to tectonics deformations around the southern SCS resulting in rapid uplift of islands and subsequent increase of the sediment rates and pollen influx and on the other side to climate cooling and monsoon enhancement. Around 2.63 Ma was another obvious boundary,the increasing of pollen and spores influx since this time was mainly related to global climate cooling. Spectrum analysis of pollen influx values shows that 2 Ma,0.67 Ma,and 0.19-0.17 Ma cycles existed during 12-3.0 Ma,while 0.1 Ma and 46.9 ka cycles existed during 3.0-2.0 Ma.     

血液净化疗法抢救急重症克感敏中毒18例

目的：提高重症克感敏中毒患者的救治成功率。方法：在一般性抢救治疗的基础上，应用血液透析、血液灌流等血液净化技术抢救治疗急重症克感敏中毒患者18例。结果：抢救成功17例（94．4％），且无并发症、后遗症；1例因凝血功能障碍，呼吸循环衰竭死亡。结论：血液净化是抢救急重症克感敏中毒的一种切实有效的治疗方法，具有治疗周期短、效果好、副作用小等优点。     

A Formal Model of OSI X.25/FR Gateway Based on High Level Petri Net

Specification and validation of protocol conversion in a gatewayis a difficult problem in protocol engineering. During design and implementation of an OSI X.25/FR gateway, a high-level Petri Net called EPr/TN is introduced as a formal specification tool to solve this problem. A formal model of the gateway is constructed by using Epr/TN. Based on this model, the process of protocol conversion and data transmission in the gateway are analyzed and validated. With object-oriented techniques, this model is also utilized in the software development of the gateway.     

模糊蕴涵与作用关系

对社会科学中的两个元素之间的作用关系进行了研究，从而给出了社会关系中的作用关系的描述，讨论了关于Mizumoto蕴涵算法的作用关系的性质、作用规则和模糊作用的逻辑关系，为研究社会关系中的作用关系理论提供了一种数学方法。     

丙烯在镍离子高分散催化剂上反应过程的TPSR EPR XPS UV-DRS研究

用ＴＰＳＲ法对丙烯在硫酸镍高分散型催化剂上反应过程进行考察；用ＮＨ３－ＴＰＤ法对ＮＨ３吸附中心进行跟踪，发现除强弱两类酸中心外，确有第三类活性中心，此第三类活性中心可能就是配位催化活性中心。     

不同水/表面活性剂比的微乳液制备纳米Ni-Fe复合微粒的组成和粒径分布

用X－射线衍射（XRD）和透射电子显微镜（TEM）等研究了不同水／表面活性剂（[W]/[S]）比的微乳液制备纳米Ni-Fe复合微粒的组成和粒径分布，结果表明，([W]/[S]）比值不同，得到的Ni-Fe复合物微粒不但粒径不同，而产物的组成也有差异，当([W]/[S]）＞240时，微粒粒径最小，但组成复杂；当([W]/[S]）＜198时，微粒粒径呈寺大，但组成较单一，且可得到Ni-Fe合金相，各样品磁参数的测量表明，当将Ni-Fe组分总量规一化时，发现随Ni/Fe比增加，磁参数减小。     

外周血嗜酸细胞增多与相关性疾病

嗜酸细胞是粒细胞系统中的重要组成部分,成熟的嗜酸细胞在外周血中占全身嗜酸细胞总数的1%左右,大部分存在于骨髓和组织中.正常人循环血液中嗜酸细胞小于0.5×109/L,嗜酸细胞具有吞噬作用和一系列的免疫功能.研究发现,很多疾病与外周血嗜酸细胞增多有关.     

HPLC Determination of Ascorbic Acid Using Luminol-Cu(Ⅱ) Chemiluminescence-Application to the Analysis of Juice Beverage

The chemiluminescence (CL) of luminol-Cu(Ⅱ) was applied to HPLC determination of ascorbic acid, which was separated by a C18 reverse-phase column with a mobile phase of 0.25 mol/L HAc. The eluted ascorbic acid was mixed with 0.3 mmol/L luminol and 0.05 mol/L CuSO4. The light emission from the reaction of Cu(Ⅱ) oxidized ascorbic acid and luminol was detected by a modified luminometer. The detection limit was 3.6×10-6 mol/L for ascorbic acid at a S/N ratio of 3, and the linear calibration range was 2×10-4- 2×10-3 mol/L. The relative standard deviation for 5 replicate injections of 1×10-3 mol/L ascorbic acid was calculated as 4.3 %. The method was successfully applied to determination of ascorbic acid in juice beverage.     

Transmission and demodulation of multi-polarization-multiplexed signals

We propose the configuration of signal multiplexing with four polarization states and investigate its transmission performance over single-mode fiber links. Using coherent detection and digital signal processing, a demodulation scheme for four-polarization-multiplexed (4PM) system is presented. We discuss the impact of crosstalk from polarization mode dispersion and polarization beam splitter misalignment on the proposed 4PM system. Furthermore, the transmission distance could be doubled to ~50 km by employing feedback decision equalizers.