水解胶原蛋白对枯草芽胞杆菌生长的影响

本文测定了不同氮源(水解胶原蛋白CH、蛋白胨、明胶、硝酸钠、氯化铵)对枯草芽胞杆菌(Bacillus subtilis)生长的影响;考察了CH和玉米浆的不同配比对枯草芽胞杆菌生长的影响;研究以CH为氮源时,不同碳源对枯草芽胞杆菌生长的影响;考查CH对其它细菌发酵的影响.研究发现,在CH为氮源条件下,枯草芽胞杆菌的发酵过程可顺利进行,且微生物的生物量可保持在较高水平;同玉米浆相比,CH能使枯草芽胞杆菌达到较高的生物量;以CH为氮源时,淀粉比葡萄糖、蔗糖更有利于枯草芽胞杆菌的生长;除了枯草芽胞杆菌以外,大肠杆菌(Escherichia coli ATCC 15489)和地衣芽胞杆菌(Bacillus licheniformis CICC 20031)也能有效利用CH.这表明,在实验条件下水解胶原蛋白(CH)可以作为多种微生物发酵的氮源.     

军民融合协同创新发展模式研究——以新航集团为例

本文基于新航集团产业发展现状及未来发展方向,在国家创新驱动发展的时代背景下,秉持"军民融合,协同创新"的发展理念,不断探索与实践适合自身发展的创新模式,促进军民品产业转型升级。     

Burn-resistant behavior and mechanism of Ti14 alloy

The direct-current simulation burning method was used to investigate the burn-resistant behavior of Ti14 titanium alloy. The results show that Ti14 alloy exhibits a better burn resistance than TC4 alloy (Ti–6Al–4V). Cu is observed to preferentially migrate to the surface of Ti14 alloy during the burning reaction, and the burned product contains Cu, Cu₂O, and TiO₂. An oxide layer mainly comprising loose TiO₂ is observed beneath the burned product. Meanwhile, Ti₂Cu precipitates at grain boundaries near the interface of the oxide layer, preventing the contact between O₂ and Ti and forming a rapid diffusion layer near the matrix interface. Consequently, a multiple-layer structure with a Cu-enriched layer (burned product)/Cu-lean layer (oxide layer)/Cu-enriched layer (rapid diffusion layer) configuration is formed in the burn heat-affected zone of Ti14 alloy; this multiple-layer structure is beneficial for preventing O₂ diffusion. Furthermore, although Al can migrate to form Al₂O₃ on the surface of TC4 alloy, the burn-resistant ability of TC4 is unimproved because the Al₂O₃ is discontinuous and not present in sufficient quantity.     

采光屋面设计中一些问题和解决方法

本文提出了目前在采光屋面设计中存在的一些问题和相应的解决方法。     

石灰石原料品质对立窑生产和熟料质量影响的研究

利用ＳＥＭ、ＸＲＤ等测试手段研究了品质不好的石灰石的结晶形态。从粉磨特性、生普细度、萤石加量、率值的选取及熟料煅烧等几个方面研究了这类石灰石对立这众所周知 熟料质量的影响。     

一种基于CT-SVD的鲁棒水印算法

提出了基于Contourlet变换(CT)和奇异值分解(SVD)的水印算法.与通常直接将水印嵌入至系数中的CT算法不同,选择了CT域低通子带的部分最大系数构建矩阵,对该矩阵进行奇异值分解,经Arnold置乱后的水印结合人眼视觉特性(HVS)被自适应地嵌入至奇异值中.实验结果表明,算法保证了极高的峰值信噪比(PSNR),并且体现了对缩放、JPEG压缩、剪切、滤波等攻击很好的鲁棒性.     

天然汁对绞股蓝愈伤组织增殖的效应

以５种天然汁代替激素２,４－Ｄ、ｋｔ对绞股蓝愈伤组织增殖效庆进行研究,结果表明：所用５种天然汁以玉米汁的效应最佳,最佳浓度为７．５ｍＬ．Ｌ＾－１,其次是荸荠 汁,最佳浓度为１０．０ｍＬ．Ｌ６－１。     

Syntheses and lyotropic liquid crystal properties of a series of sandwich-type tungstoarsenates heteropoly compounds with As/W ratio of 4/30

A series of sandwich-type tungstoarsenates heteropoly compounds with As/W ratio of 4/30, Na16[As4W30M4(H2O)2O112]·XH2O (M = Zn,Cu,Co,Ni,Mn and Cd), have been synthesized for the first time and structurally characterized by elemental analysis, IR and 183W NMR spectra. The crystal structure of Na16[As4W30Cu4(H2O)2O112]·63H2O was determined to be a triclinic system, of P1 symmetry, a = 1.2721(3) nm, b = 2.451 6(5) nm, c = 2.6450(5) nm, α= 89.90(3)°,β= 77.32(3)°, γ= 89.96(3)°, 2=2. Using tetrahepty lammonium bromide as a phase transfer reagent, [As4W30Cu4(H2O)2O112]16- was transferred from aqueous solution to organic phase (benzene), and the heteropolyanion lost the coordination water molecules to form the coordination-unsaturated ion. After lactic acid was added to the benzene solution, the coordination-saturation was recovered. By esterification reaction between lactic acid and cholesterin, the latter was attached to the heteropolyanion indirectly. Therefore, a new type of lyotropic liquid crystal was obtained, which was characterized by a polarimicroscope, DSC and variable temperature wide-angle X-ray diffraction.     

基于规则的T-S模糊神经网络

该文提出了一种基于规则的Ｔ－ Ｓ模糊神经网络的结构和相应的算法。首先用自组织算法对学习数据进行聚类生成一组初始的模糊规则,然后用误差反传法细调网络参数,通过仿真验证,该模糊神经网络具有结构简单,拟合精度高等优点。     

图C4∪St(m)的k优美性及算术性

给出一类非连通图C4∪St(m). 论证当k>1(k∈N)时, 该图是k优美图; 当k>d+1(d>1, d∈N)时, 图C4∪St(m)是(k,d)算术图.