红层堆积体地区坡体结构分类

广元到巴中高速公路沿线分布有广泛的红层堆积体高边坡。红层堆积体是红层地区一种特殊的坡体结构类别,不同堆积物形成的堆积体,特别是堆积体内含大量块石夹土或孤石的情况下,结构不均匀性非常明显,堆积体自身结构松散。块石土堆积体为主要的分布最广泛的堆积类型,但沿线三种不同类型的堆积地区均有其代表性堆积体结构:古滑坡地区以粘土层下卧块石土堆积体为主;岩堆地区主要为层状堆积体;而一般性堆积体地区广泛分布有块石土粘土夹杂大孤石堆积体。对红层堆积体坡体结构在不同堆积地区的详细分类,为进一步研究红层堆积体高边坡的破坏机理和致灾模式提供了初步依据。     

北方某市水源更换过程中管网黄水产生机制的探讨

针对北方某市在水源更换过程中管网出现局部黄水的现象,从新旧水源水质特征对比、管网的管材构成、管道内壁腐蚀层结构特征等方面探讨了产生黄水的内在原因,并对水源更换过程中防控黄水应采取的措施提出了建议。     

Ascorbic acid contribution to ORAC values in berry extracts: An evaluation by the ORAC-pyrogallol red methodology

An oxygen radical absorbance capacity (ORAC) method based on pyrogallol red bleaching (ORAC-PGR) was used to evaluate the scavenging activity of berry extracts (blackberry, blueberry, and raspberry). Among berry extracts, only raspberry protected pyrogallol red through a clear induction time, related exclusively to ascorbic acid. The lag time allowed an estimation of the ascorbic acid concentration and its contribution to the total ORAC value, estimating that 66% of the ORAC-PGR value of raspberry is related to ascorbic acid. Also, from the induction time, an ascorbic acid concentration of 36 mg per 100 g of fresh weight was estimated for raspberry samples. The ORAC-PGR procedure could be considered as a fast and specific methodology for an estimation of ascorbic acid concentrations in complex samples.     

秭归罗圈荒地区微震群时空特征初步研究

简要分析秭归罗圈荒地区的微震群事件,微震群属于煤矿开采以及回采工程活动导致的煤矿地震,与区域应力场的变化存在一定的相关性.此地区2次微震群的发生属于偶发的局部应力释放.     

KSrPO_4:Eu~(3+)红色发光材料的制备及性能研究

采用高温固相合成工艺制备了KSrPO4:x Eu3+红色发光材料,通过X射线衍射、荧光光谱、量子效率仪、封装对发光材料的晶体结构及发光特性进行了研究。XRD表明KSrPO4晶体结构并没有随着Eu3+的掺入而发生变化;荧光光谱表明KSrPO4:Eu3+在394 nm处存在最强激发峰,发射光谱最强发射峰为612nm;量子效率研究表明随着Eu3+掺杂量的增加,量子效率先增后降,在Eu3+掺杂量x=0.04时,量子效率存在最大值51%;封装光源的显色指数为83,色温3497 K,并且随着电流的变化色坐标(X,Y)基本保持不变,因此,KSrPO4:Eu3+红色发光材料作为近紫外激发的红色发光材料具有一定的潜力。     

Remotely Controlled Red Blood Cell Carriers for Cancer Targeting and Near‐Infrared Light‐Triggered Drug Release in Combined Photothermal–Chemotherapy

Red blood cells (RBCs), the “innate carriers” in blood vessels, are gifted with many unique advantages in drug transportation over synthetic drug delivery systems (DDSs). Herein, a tumor angiogenesis targeting, light stimulus‐responsive, RBC‐based DDS is developed by incorporating various functional components within the RBC platform. An albumin bound near‐infrared (NIR) dye, together with a chemotherapy drug doxorubicin, is encapsulated inside RBCs, the surfaces of which are modified with a targeting peptide to allow cancer targeting. Under stimulation by an external NIR laser, the membrane of the RBCs would be destroyed by the light‐induced photothermal heating, resulting in effective drug release. As a proof of principle, RBC‐based cancer cell targeted drug delivery and light‐controlled drug release is demonstrated in vitro, achieving a marked synergistic therapeutic effect through the combined photothermal–chemotherapy. This work presents a novel design of smart RBC carriers, which are inherently biocompatible, promising for targeted combination therapy of cancer.     

镁铝水滑石纳米片可控制备及其吸附性能研究

在聚乙二醇(PEG)存在的条件下,通过一步水热法合成了晶相单一的六方片状镁铝水滑石层状双氢氧化物(LDH)。采用XRD、SEM、TEM、FT-IR、N2吸附、UV-Vis紫外-分光光度计和zeta电位仪等对产物进行了表征。考察了PEG活性剂对水滑石形貌及性能的影响。结果表明,添加活性剂改性后制备的六边形水滑石纳米片形貌规整均一,宽约几微米,厚度约为100~200 nm,纳米片间易形成交叉支撑结构,分散性好,比表面积为203.5 m2/g。在室温,焙烧后的Mg AlLDO对浓度为100 mg/L的刚果红30 min内去除率可达97%,饱和吸附量为243.5 mg/g。     

The shrinkage properties of red pine wood assessed by image analysis and near-infrared spectroscopy

This work focused on the shrinkage and drying stress of red pine (Pinus densiflora) wood during kiln drying and investigated transverse shrinkage and moisture changes in thin specimens using digital image analysis and near-infrared spectroscopy, respectively. The effect of specimen thickness, which ranged from 1 to 10?mm on shrinkage, was analyzed under drying conditions with restrained stresses. The shrinkage due to moisture content was presented in the form of an exponential function and a linear function above and below the fiber saturation point, respectively. A shorter existence of the moisture gradient increased the transverse shrinkage. The tangential and radial shrinkage at the tissue level in 30-µm (longitudinal) thick slices was measured and compared with the shrinkage of above specimens with difference thicknesses. The transverse shrinkage of 1-mm-thick specimen is similar to the shrinkage measured using 30-µm-thick slice.     

铝炭微电解处理刚果红废水的脱色动力学研究

采用铝炭微电解法处理刚果红废水。动力学研究结果表明,铝炭微电解降解刚果红的脱色过程符合表观二级动力学方程。刚果红脱色反应速率随着溶液初始p H、铝粉投加量、温度、摇床转速的增大而提高,随着铝炭质量比的降低先提高后降低。在温度为15~35℃范围内刚果红脱色反应活化能为17.75 k J/mol。采用铝炭微电解法处理某纺织印染公司实际印染废水,实验表明,在p H为11~12范围内,废水COD去除率不低于50%,反应后出水基本无颜色。