Calculation of the Hardness Space Distribution in the As Quenched Condition of a Medium Hardening Tool Steel

The calculation of the hardness profile is a powerful tool for the selection of the right steel for a given purpose. Computer programs INC-PHATRAN and INDUCTER-B were formerly developed by the authors for the calculation of hardness profiles after heat treatment processes of low alloy and carbon steels. The first one simulates quenching as well as through hardening operations, and the second one models electromagnetic induction heat treatments processes. These codes make use of the SAE Standard 3406 in order to obtain the hardness profile, with enhanced regression coefficients recently obtained by the authors. The present work broadens the field of application of this method, allowing to apply it for low hardenability tool steels such as the ASTM O1 Tool Steel. The method used for the calculation of the hardness profile is here summarized, and an example of application is described, which shows good correspondence between the calculated and measured values.

硅量子点荧光探针检测8-羟基喹啉的研究

量子点荧光探针已广泛用于酚类化合物的检测,但用于具有特殊结构的酚类化合物8-羟基喹啉(8-HQ)检测的相关研究报道很少。本文以硅烷偶联剂KH550和抗坏血酸为原料,通过一步水热法制备了蓝光硅量子点(B-SiQDs)。研究发现,8-HQ对B-SiQDs有显著荧光猝灭效应;在最佳实验条件下,8-HQ浓度在0.01~0.4 mmol·L^(-1)范围内与B-SiQDs荧光猝灭率呈良好线性关系,检测限0.12μmol·L^(-1)。将该方法用于护发素样品中8-HQ的检测,加标回收率在96%~107%范围内,相对标准偏差(RSD)低于1%,结果令人满意。

土壤调理剂固体废物属性鉴别研究

本文以某未知样品为研究对象,分析了样品外观及物理化学特性。结果发现,样品具有特征物相——无定型硅酸盐,其结构与成分符合冶炼过程副产物水淬渣的特征,但是这种水淬渣未经进一步加工,不适合直接用作土壤调理剂。