斜筛替代单圆网浓缩机用于废纸浆料浓缩工艺改进

着重介绍了斜筛替代单圆网浓缩机用于废纸制浆浓缩工序的应用实践,及浓缩工序改进后取得的效果;应用实践表明:浓缩工序改进后用于废纸制浆的外排白水中的浆料流失由1.18g/L降低到0.78g/L,流失率降低了38.9%,吨浆电耗下降了30%,供浆浓度得以稳定控制在(4.0±0.2)%。     

食品中晚期糖基化终产物的研究进展

晚期糖基化终产物(advanced glycation end products,AGEs)被认为和氧化应激、多种慢性疾病以及人体衰老等具有密切关系,近年来成为医药和健康领域的研究热点,但在食品领域研究相对较少。事实上,食物由于不同的加工处理方法和存放条件,可能会产生AGEs;若长期摄入AGEs可能增加体内的AGEs水平从而对人体造成危害,对食品中AGEs的研究已引起食品领域科学家的关注。文中主要对食品中AGEs的生成机理、主要种类、检测方法、对人体的影响,以及控制方法等几方面进行综述。     

浅析胶辊表面粗糙度不匀对纺纱质量的影响

分析了胶辊表面粗糙度不匀产生的原因 ,并运用试验数据就纺纱胶辊不同的表面粗糙度值对不同品种纱的适应性进行了论述 ,说明了表面粗糙度不匀对成纱质量的影响及解决方法     

豆乳生产新工艺的研究

分别研究了从全脂大豆蛋白粉和分离蛋白直接生产豆乳的工艺及工艺条件,结果表明,全脂大豆粉适合生产混合型豆乳(牛乳与豆乳混合);分离蛋白既可生产混合型豆乳,也可生产纯豆乳,得到的产品无豆腥味、无沉淀.     

基于本征特征的弹性模板匹配法

本文在弹性模板匹配法的基础上,提出了基于本征特征的弹性模板匹配法,用地人脸图像的识别。该方法利用ＫＬ变换进行模板的定痊使得定位精度与速度都有所提高,并且识别准确度也得到改善。     

Synthesis, Structure and Cyclic Voltammetry Studies of a 2D Sheet-like μ3-Hydroxyl- and μ2-, μ4-Oxamidato-Bridged Copper(II) Complex

A novel 2D sheet-like copper(II) complex formulated [Cu₆(trans-oxen)₃(μ₃-OH)₂(H₂O)₂]_n-(ClO₄)_4n^.2nH₂O (1), where H₂oxen is N,N’-bis(2-aminoethyl)oxamide, has been synthesized and characterized by elemental analysis, IR and UV–visible spectroscopy, and single-crystal X-ray diffraction. 1 crystallizes in triclinic space group P-1 with crystallographic data: a = 10.299(2) ?, b = 10.833(2) ?, c = 11.781(2) ?, α = 69.95(3)°, β = 81.10(3)°, γ = 62.44(3)°, and Z = 2. In the crystal structure, the cation [Cu₆(trans-oxen)₃(μ₃-OH)₂(H₂O)₂]_n⁴ⁿ⁺ exhibits a two-dimensional sheet-like structure for Cu(II) ions bridged both by trans-oxen and hydroxyl groups. Each Cu(II) ion is located in a slightly distorted square-pyramidal environment. The hydroxyl group bridges three [Cu(oxen)Cu]²⁺ dications in which one oxen²⁻ is μ₂-bridge while the other two act as never before reported μ₄-bridge. Perchlorate anions and H₂O molecules are inserted between the sheets and bridge the 2D cations via N–H···O and O–H···O hydrogen bonds to form an infinite three-dimensional system. The cyclic voltammetric behavior of 1 and the influence of counter ions on structure are preliminarily investigated.     

Double-perovskite magnetic La2NiMnO6 nanoparticles for adsorption of bovine serum albumin applications

Double-perovskite La₂NiMnO₆ (LNMO) nanoparticles were synthesized by co-precipitation process, and the adsorption of bovine serum albumin (BSA) protein on these nanoparticles was carried out. The powder samples were annealed at 750, 850, 950, and 1,050°C, respectively. X-ray diffraction (XRD) results reveal that there are double perovskites and exhibit mixed orientations, without any impurity phases. Transmission electron microscopy results as well as the XRD estimate results show that the crystalline size is about 34 to 40 nm. The adsorption of BSA on the magnetic nanoparticles was analyzed using a UV spectrophotometer at room temperature. The results show that the as-prepared LNMO nanoparticles display a good adsorbing ability for BSA, and the nanoparticle sintered at 850°C has the highest value of 219.6 mg/g, which is much higher than others.     

Energy structure,marginal efficiency and substitution rate: An empirical study of China

Energy efficiency is an important factor in developing energy policies as it represents the extent to which resources support economic output. In recent literature, relevant studies have mainly focused on aggregate energy efficiency, but rarely touched on the marginal efficiency of diverse energy resources and their comparative substitution rate. During 1978–2003, China's energy efficiency continually increased; and consequently became a hot topic in contemporary literature. However, there is no empirical study on the relationship between energy structure and energy efficiency. In order to close the gap, this paper reports the empirical study of the impact of China's energy structure on its energy efficiency from 1978 to 2003. The work covered primary estimation of the marginal efficiency of coal and petroleum in China, as well as the comparative substitution rate. Results indicate that the substitution rate between petroleum and coal is a factor of 5.38.     

A new technique based on traditional wavelet transform used in NVH application of internal combustion engine

The sound and vibration signal of internal combustion engine (ICE) is typically unsteady and very complex. Recently the wavelet transform, we see, is being widely used as a time–frequency representation. A new technique that is based on traditional wavelet transform and has many advantages over traditional spectrograms is proposed in this study. The performance of the new technique is validated by applying it to a numerical simulation and test signals. It is shown that the new technique is suited for complicated signals that contain multiple impacts and/or dynamic changes in time and frequency domain.     

一种新颖的酮洛芬合成工艺

针对传统工艺时间较长,容易产生自身缩合副产物的问题,本工艺以腈乙基二苯甲酮为原料,经碱性条件下水解得酮洛芬。反应时间从10h缩短为1h,副反应少,原料转化率高,产品收率达99%以上。