多传感器信息融合系统有序度分析

对多传感器信息融合系统,提出了融合处理的结构;通过引入信息融合系统有序度的概念,建立了一种基于信息熵理论的结构体系评价方法,用以从传感器管理的角度评价多传感器融合体系结构的组织化程度.     

机械动力学结构模态分析实验的教学改革

针对目前机械动力学课程中悬臂梁结构模态分析实验存在的问题,引导学生将学习过的CAD/CAE软件操作知识运用于该实验,弥补了实验仪器和实验装置的不足,也提高了学生做实验的主动性和创新性,大大提升了实验效果。     

混凝土坝厚层短歇的快速浇筑方法及应用

混凝土坝工程投资大、建设周期长,同时存在混凝土容易开裂,影响工程安全的问题．为解决这些矛盾,分析了混凝土施工中浇筑层厚和间歇期的影响因素,介绍了厚层短歇的快速浇筑思路,提出由此产生的不利方面可用适当的温控措施予以解决．该方法在国内几个工程中实施获得成功,实现的效益显著．     

高职师范专业计算机基础课程的项目式教学改革

随着现代教育信息化的发展,高职师范专业计算机基础课程传统的教学模式已不能适应培养未来教师的信息技术能力的需要.通过分析师范专业计算机基础教学中存在的问题,从教学内容、教学方式等方面探讨以学生为主体的项目式教学改革方案.教学实践证明,以项目为载体,以培养学生能力为目标的教学的确能提高教学效果,增强学生将信息技术用于教育教学实践的能力.     

Carbon isotopic compositions of pore and matrix carbonates in carbonate nodules, and origin of carbonate formation

Carbon isotopes of pedogenic carbonate are often used to study paleoenvironments, but the existence of detrital carbonate changes the carbon isotopic composition. To develop an experimental method to determine existence of detrital carbonate in carbonate nodules, and to avoid it during isotope analysis, 23 pedogenic carbonate nodules in Miocene loess from the Loess Plateau of China were studied through micromorphology and carbon isotope analysis. The difference in carbon isotopic composition between matrix carbonate (B) and pore carbonate (A) (δ¹³C_(B-A)) ranges from 0.27‰ to 0.44‰ in nodules containing detrital carbonate and –0.16‰ to 0.13‰ in nodules where detrital carbonate is absent. The latter is within measurement error, but the former is beyond it. Here we propose an isotopic approach to determine if nodules contain detrital carbonate: if δ¹³C_(B-A) is within the measurement error, the nodules do not contain detrital carbonate, and vice versa. We suggest that it is better to analyze pore carbonate instead of matrix carbonate when using carbon isotope of carbonate nodules to reconstruct paleoenvironments.     

犬消声实验及其观察

目的探索一种简单、有效的犬消声方法,并对其消声效果和声音恢复情况进行观察。方法对10只易兴 奋,喜吠的普通级犬,行口腔内电刀直接切除声带,并分别于术前、术后3d,7d,15d,30d,3个月,6个和12个月进行 声音值测量。结果术后犬叫声较术前有明显降低,随时问推移声音有所恢复,但不会恢复到原来状 态。结论烧烙法行El腔直接切除声带是一种简单、安全、有效的犬消声方法。     

约束向量优化问题的像空间分析

利用一类非线性标量化函数得到一个非线性弱分离函数和一个非线性正则弱分离函数, 并应用像空间分析方法讨论了约束向量优化问题的最优性条件.     

Comparative study of different membranes as separators for rechargeable lithium-ion batteries

Membranes of polypropylene (PP), PP coated with nano-Al₂O₃, PP electrospun with polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP), and trilayer laminates of polypropylene-polyethylene-polypropylene (PP/PE/PP) were comparatively studied. Their physical properties were characterized by means of thermal shrinkage test, liquid electrolyte uptake, and field emission scanning electron microscopy (FESEM). Results show that, for the different membranes as PP, PP coated with nano-Al₂O₃, PP electrospun with PVdF-HFP, and PP/PE/PP, the thermal shrinkages are 14%, 6%, 12.6%, and 13.3%, while the liquid electrolyte uptakes are 110%, 150%, 217%, and 129%, respectively. In addition, the effects on the performance of lithium-ion batteries (LiFePO₄ and LiNi_1/3Co_1/3Mn_1/3O₂ as the cathode material) were investigated by AC impedance and galvanostatic charge/discharge test. It is found that PP coated with Al₂O₃ and PP electrospun with PVdF-HFP can effectively increase the wettability between the cathode material and liquid electrolyte, and therefore reduce the charge transfer resistance, which improves the capacity retention and battery performance.     

喷油螺杆空压机油气分离器设计探讨

喷油螺杆空气压缩机具有运转可靠、气量不受排气压力影响、运转平稳不发生喘振等特点,因此在工业上得到了广泛应用,而对于喷油螺杆空气压缩机来讲,油气分离器是重要部件之一,起着至关重要的作用.文章针对喷油螺杆压缩机油气分离器及滤芯设计进行了分析.     

锌(Ⅱ)配合物超分子的合成、结构及性质研究

以ZnF2和吡啶-2,4-二甲酸为原料,运用水热法在120oC下反应两天,合成了一个配合物超分子[Zn(pydc)(Hpydc)(H2O)2]·Him·H2O (1, H2pydc＝吡啶-2,4-二甲酸,im＝咪唑).并对配合物进行了X射线单晶衍射、X射线粉末衍射、红外光谱、热稳定性分析以及室温固态荧光光谱等表征.结果表明：配合物属于三斜晶系,P-1空间群,晶胞参数a＝7.3791(6) ?, b＝10.6071(8) ?, c＝13.2907(10) ?, α＝81.3620(10)°, β＝77.4610(10)°, γ＝79.5930(10)°; V＝992.06(13) ?3,Z＝2.室温固态荧光结果显示,配合物呈现蓝色荧光.