浅谈四曲线法测定桩基沉降原理

在武广高速铁路赤壁路基试验段施工完成后,为了更好的分析路基下部CFG桩复合地基实际沉降数据。采用了4种曲线拟合法对路基沉降进行了预测分析及对比研究。结果表明:曲线拟合法的预测精度取决于映射函数和实测沉降样本空间范围,星野法和双曲线法的预测值与实测值吻合较好。该成果为适用于武广高速铁路及其它相关工程的复合地基的沉降预测提拱参考依据。     

合成误差椭圆在评定目标运动要素测量精度中的应用

本文提出了将测量船推算舰位误差椭圆与目标位置误差椭圆合成的合成误差椭圆的方法，以提高对目标运动要素的测量精度，并给出了算例。     

原子吸收光谱法测定底栖动物重金属元素的含量

测定了3种底栖动物中汞、铅、铬、铜、钡和锰的含量,将底栖动物经烘干研磨制成粉,经硝酸-高氯酸消解后,用原子吸收光谱法测定其中重金属元素的含量.实验发现：无需分离,即可用原子吸收法对重金属进行分析;经测定3种底栖动物中汞、铅、铬、铜、钡和锰的含量多数超过国标.结果表明该方法简便、快速、测试灵敏度高、线性关系良好、分析准确,加标回收率达94.00%～106.00%.     

液压油污染度的测定

本文介绍了用液压油污染测定装置来测量液压油污染度的方法。     

Normal and reverse flow injection-spectrophotometric determination of thiamine hydrochloride in pharmaceutical preparations using diazotized metoclopramide

Simple and sensitive normal and reverse flow injection methods for spectrophotometric determination of thiamine hydrochloride (THC) at the microgram level were proposed and optimized. Both methods are ...     

制浆、造纸业中的微波浓度测定

微波浓度测定是工业应用中用于进行过程控制的最为现代的测定技术之一。过去几年,在纸厂和浆厂里通过对大管径管线进行的浓度测定业已表明,由proMtec并发的微波浓度测定方法确实给纸、浆厂提供了一项实时测定浓度的技术。该项技术的应用还包括纸浆、剥皮淤泥和造纸黑液的浓度测定。     

试杆法测定水泥标准稠度用水量试验判定标准（6±1）mm调整研究

本文通过对试杆法测定水泥标准稠度用水量试验的分析研究,提出了将规程规定的试验结果判定标准（6±1）mm调整为距底板（6±2）mm的设想,以降低该试验的操作难度,提高工作效率。经过大量试验论证表明,该调整设想具有可行性。     

RP-HPLC method for the simultaneous determination of daidzein,genistein and formonetin in Solanum Lyratum Thunb

A rapid method for the simultaneous determination of daidzein, genistein and formonetin in solanum Lyratum Thunb by high performance liquid chromatography (HPLC) was developed. Separation was achieved on a Diamonsil C18 column (250 mm×4.6 mm, 5 μm) with isocratic elution, using a mobile phase of methanol-tetrahydrofuran-water (44∶3∶53, v/v). The wavelength was set at 260 nm and column was maintained at 35 ℃. The linear ranges of daidzein, genistein and formonetin were 1.0-40.0, 0.1-4.0 and 0.1-4.0 μg/mL, respectively. The average recoveries were between 98.4% and 101.3%. This method could be used for the quality control of Solanum lyratum Thunb due to its simplification, reliability, rapidity and excellent precision.     

Spectrophotometric detection of diethylstilbestrol on the basis of the plasmon resonance absorption of silver nanoparticles

In this study, a spectrophotometric detection method for diethylstilbestrol (DES) was proposed by reducing silver nitrate (AgNO3) to obtain silver nanoparticles (AgNPs) in the medium of ammonia and sodium hydroxide. It was found that the resulting AgNPs have plasmon resonance absorption (PRA) characteristic at 415 nm, and the PRA is proportional to the increase of DES concentration in the range of 4.0×10-8-1.0×10-5M with the detection limit (3σ) of 1.2×10-7M. Most of the coexisting substances at high concentrations did not affect the detection of real samples, such as tablets. The recovery was in the range of 96.01%-107.41% and the RSD was lower than 4.7%. This method can be successfully applied to control preparation quality of DES.