化工企业温度测量系统误差分析方法及对策

本文运用分立单元校准和系统校准的方法对温度测量系统进行了校准,并提出后者的优越性。结合工作实践,在校准过程中对系统的误差来源及形成原因进行分析,给出了相应的建议和对策。结呆表明,误差分析的思路和对策能有效解决大部分的误差问题,对化工企业温度测量有一定的应用价值。     

Multicomposition analysis and pattern recognition of Chinese geographical indication product: vinegar

Multicomposition fingerprints with several chemical compositions containing inorganic elements and organic compounds (amino acids, polyhydric alcohols, organic acids) were measured to distinguish two geographical indication-protected vinegars (GIs) from general vinegars (nGIs). The two of GIs were named Shanxi extra aged vinegar and Zhenjiang vinegar from Shanxi and Jiangsu province, respectively. Principal component analysis and Fisher linear discriminant methods were applied for the pattern recognition and classification of GI product. It was not suitable by simply using one kind of composition to make a distinction between GIs and nGIs. However, by using multicomposition to build a classify model, the classification of SXVs was described by Co, As, Al, Mg, Ca, erythritol, arabitol, sorbitol, proline, lysine and pyruvic acid, while ZJVs classification was described by threonine, serine, glycine, lysine, Ba, erythritol, xylitol and lactic acid. The GI samples can be classified with high accuracy according to the discriminant model, of which the false rate is 3.88 % in SXVs model and 10.85 % in ZJVs model. This method can be a useful method for protecting the geographical indication vinegars from the fake or adulterate vinegar commodities.     

Alternating-color quantum dot nanocomposites for particle tracking

Because of their extraordinary brightness and photostability, quantum dots (QDs) have tremendous potential for long-term, particle tracking in heterogeneous systems (e.g., living cells, microfluidic flow). However, one of their major limitations is blinking, an intermittent loss of fluorescence, characteristic of individual and small clusters of QDs, that interrupts particle tracking. Recently, several research groups have reported "nonblinking QDs". However, blinking is the primary method used to confirm nanoparticle aggregation status in situ, and single or small clusters of nanoparticles with continuous fluorescence emission are difficult to discern from large aggregates. Here, we describe a new class of quantum dot-based composite nanoparticles that solve these two seemingly irreconcilable problems by exhibiting near-continuous, alternating-color fluorescence, which permits aggregation status discrimination by observable color changes even during motion across the focal plane. These materials will greatly enhance particle tracking in cell biology, biophysics, and fluid mechanics.     

航空用三相电压型PWM整流器并联控制技术

本文分析了双路三相电压型PWM整流系统并联原理,基于航空270V高压直流并联系统,提出了一种以三相电压型PWM整流器为整流方式的均流策略.在MATLAB中建立了系统的等效仿真模型,并进行了系统的硬件电路试验,仿真与试验均证明了此均流方法的可行性.     

Anti slip security assessment between main cable and saddle of the middle pylon under extreme vehicle loads

The traffic condition of Taizhou Yangtze River Bridge is obtained to a certain extent, according to the traffic investigation nearby Taizhou Bridge. The statistical characteristics of the traffic conditions are acquired by statistical analysis. Simulation of the extreme vehicle loads and the sensitive analysis of load parameters are carried out based on these data complemented, which would guide the determination of the frictional coefficient between the main cables and the saddle.     

相变贮热材料的DSC研究

用ＤＳＣ法研究了多元醇，层状钙钛矿等几种相变材料的热物理性能，它们都是有希望的贮热材料，实验所得数据是评价和选择这些材料的主要依据。     

乌桕类可可脂及可可脂氧化稳定特性之形态学研究

乌桕类可可脂(简称CTCBE)可替代天然可可脂用于制作巧克力，口感好，但容易被氧化。氧化稳定特性之形态学研究中扫描电镜(SEM)结果表明：CTCBE形态结构特征为排列中存在许多细微的孔洞，增大了CTCBE与O2作用比表面积，且有利于O2向CTCBE的界面扩散，进入CTCBE内部进行氧化。而天然可可脂(CB)的组织排列结构致密，可以产生一种天然物理屏障阻止O2渗入CB固体内部。这是CTCBE氧化稳定性差。而CB氧化稳定性极其高的一个重要原因。     

非织造布汽车吸音隔音材料的研制

汽车隔音毡在汽车工业中用量很大,主要作用是隔音、减震、保暖,用于汽车前部和汽车部分箱体.文章介绍了汽车隔音材料的种类和几种有代表性的隔音材料,重点介绍了非织造汽车吸音隔音毡的研制,包括纤维的选择和配比、产品的生产工艺流程和最终产品的性能测试.     

盐焗鸡食品生产加工与品质控制研究进展

盐焗鸡属广东特色客家食品,具有色泽金黄、皮爽脆、肉滑嫩、骨咸香的特点,因此深受广大消费者喜爱.从盐焗鸡加工方法、品质特点、品质影响因素等三方面入手,综述了盐焗鸡产业中生产加工与品质控制的研究现状,并提出亟待解决的问题,旨在为盐焗鸡的产业发展提供技术性参考.