自动化专业国家级优秀教学团队建设

优秀教学团队建设是教育部在高等学校中实施本科教学质量与教学改革工程的一项重要举措。长春工业大学自动化教研室2008年被教育部评为国家级教学团队,本文重点介绍该教学团队建设情况。论文内容包括:四种作用即以老带新作用、课程组整合作用、教师互助作用和团队促进作用;四个互动即教学与教研互动、教学与科研互动、理论与实践互动、教改与学改互动;教学改革"七、四、三"即课程建设的"七个一",教学内容改革的"四加强",教学方法对"三个过多与三个过少"的改革;开展创新教育的情况;加强实践环节的情况。通过上述措施加强团队建设,提高团队成员综合素质,促进教育教学质量的提高。     

Fe-ZSM-5 分子筛催化剂上N2O一步氧化苯制苯酚的积炭动力学

 采用等温固定床反应器和热重分析相结合的方法研究了 Fe-ZSM-5 分子筛上 N2O 一步氧化苯制苯酚的积炭行为, 考察了反应时间、温度和原料配比对积炭量的影响. 依据实验现象和积炭物组分分布的气相色谱-质谱分析结果, 提出了 Fe-ZSM-5 分子筛上 N2O 一步氧化苯制苯酚的积炭机理. 结果表明, Fe-ZSM-5 分子筛上的积炭物种主要来源于氧化产物苯酚的深度氧化, 属连串失活. 基于所提出的积炭机理和实验结果, 建立了 Fe-ZSM-5 分子筛催化剂的积炭动力学模型, 统计检验和残差分布检验表明, 所建模型与实验结果相容, 可靠性强.     

提高辐射场特定区域n／γ值初步实验研究

为满足用户抗辐射加固实验研究的需要，在中国第二号快中子脉冲反应堆上开展了提高特定区域内n/γ值初步实验研究。其中，n是待测辐射场中子注量，γ是相应辐射场的吸收剂量。     

生物活性牙科复合树脂的研究进展

牙科复合树脂由于色泽美观,在口腔临床上具有广泛的应用。但其仍然存在边缘缝隙的问题,从而导致继发龋的发生。再矿化复合树脂中的生物活性填料会释放能够再矿化的钙、磷离子,促使材料表面形成矿化层,能够抑制二次龋的发生。本文介绍了不同种类、含量、粒径大小和表面改性的生物活性填料对复合树脂物理、机械性能的影响,分析了再矿化复合树脂的再矿化行为,提出了再矿化复合树脂亟待解决的问题和研究难点,展望了复合树脂的研究方向。     

一种带可配置插值滤波器的14-Bit 1-GS/s 数模转换器

A programmable 14-bit 1-GS/s current-steering digital-to-analog converter is presented.It features a selectable interpolation rate(2x/4x/8x) with a programmable interpolation filter.To improve the high-frequency performance,a "fast switching" technique that adds additional biasing to the current-switch is adopted.The datadependent clock loading effect is also minimized with an improved switch control by using a double latch.This DAC is implemented in 65 nra CMOS technology with an active area of 1.56 mm~2.The measured SFDRs are 70.05 dB at 250 MS/s for 120.65 MHz input sine-wave signal and 64.24 dB at 960 MS/s for 56.3 MHz input sine-wave signal,respectively.     

模糊群的公理体系

给出了模糊群的几个等价刻画,建立模糊群的公理体系并得到了五个最小完备系.此外还讨论以消去律为条件的模糊群的刻画,给出了有限模糊群和周期模糊群的最小完备系,同时也得到了一个一般模糊群的等价刻画,根据其三个推论可清楚地区分周期模糊群、无扭模糊群和混合模糊群.     

Particle Shape Dependence of Rheological Behavior for Colloid-polymer Mixtures

The effect of particle shape on the rheological behavior of small particle-large polymer chain mixture solutions has been investigated with two model colloidal silica dispersions, one of which is ellipsoidal（BINDZIL20/440） and the other is spherical（TM40）. It was found that BINDZIL20/440 series showed shear-thickening at lower shear rates and had a lower upper limit in PEO concentration to demonstrate shear-thickening phenomena. The particle shape was identified as the major factor accounting for these differences. This work enables one to control the rheological behavior of colloid-polymer mixture through simply changing particle geometry instead of performing surface modifications, which could be especially useful in cases where only certain chemicals are allowed, for example in vivo applications.     

A low-power triple-mode sigma-delta DAC for reconfigurable(WCDMA/TD-SCDMA/GSM) transmitters

A sigma-delta(Σ△) DAC with channel filtering for multi-standard wireless transmitters used in the software-defined-radio(SDR) system is presented.The conversion frequency,transfer function of the digital filter and theΣ△modulator,word-length of the IDAC and cut-off frequency of the analog reconstruction filter can be digitally programmed to satisfy specifications of WCDMA,TD-SCDMA and GSM standards.TheΣ△DAC fabricated in SMIC 0.13-μm CMOS process occupies a die area of 0.72 mm~2,while consuming 5.52/4.82/3.04 mW in WCDMA/TD-SCDMA/GSM mode from a single 1.2-V supply voltage.The measured SFDR is 62.8/60.1/ 75.5 dB for WCDMA/TD-SCDMA/GSM mode,respectively.     

相反转乳化技术制备环氧树脂交联多孔微球

多孔微球在分离吸附、催化、涂料印刷等多方面具有潜在应用价值 .最近研究表明 ,当微孔孔径在 2 0 0～ 80 0ｎｍ范围时 ,由于强烈的光散射作用 ,多孔微球可以作为遮光剂使用[1] .Ｏｋｕｂｏ等用酸碱逐步处理法制备了一些共聚物的亚微米级多孔球[2～ 4] .Ｏｋｕｂｏ又用动态溶胀种子聚合法制备了微米级的聚合物微球 ,用类似的方法得到了多孔结构[5,6] .但这种方法涉及了许多烦琐过程并且产生了很多副产物需要处理 ,使得其费时费力而且成本相当高 .Ｓｃｈｌａｒｂ等发展了一种新的制备方法 ,在乳液聚合过程中引入有机溶剂 ,在实验后期除掉有机…     

Structure and interaction of adsorbing symmetrical triblock polyampholyte solution between two planes

In this paper, the continuum self-consistent field theory(SCFT) is applied to study the structure and the interaction of the adsorption of symmetrical ABA polyampholytes(PAs) between two neutral planes. It is found that the amounts of all the conformations decrease with the increase of the charge fraction of polymer chain, and increase with the increase of the bulk salt concentration and become saturated at high bulk salt concentration. The effective interaction between the two planes presented a long-range repulsion. Splitting it into various components and relating with the dependence of the variations of the conformations on environment parameters, we try to find the origin of the total long-range interaction between the two planes.