C＋＋中构造函数的三种调用问题解析

构造函数是一种用于创建对象的特殊成员函数,构造函数的调用顺序问题对类的定义至关重要,本文从简单类对象的创建、类组合（一个类的对象是另一个类的数据成员）和类继承三种情况下分析了构造函数的调用问题,一定程度上诠释了类定义中的这一关键因素,为更好掌握C＋＋的编程思想提供了理论依据和程序示例。     

The use of the diagonal compression test to identify the shear mechanical parameters of masonry

In this paper, the mechanical meaning, the experimental evaluation and the proper use of the mechanical parameters, which the most diffused simplified models for the prediction for the Diagonal Cracking failure mode in masonry piers are based on, are analysed. Moreover, a procedure to obtain a “mean” evaluation of the cohesion and the friction coefficient of mortar joints of masonry through the diagonal compression test is proposed. In order to assess the reliability of the procedure, a set of non-linear numerical simulations have been performed.     

Tribological behaviors of FeCoNiCrAlx sliding against Si3N4 ceramics under high temperature condition

Tribological behaviors are system responses that not only depend on material properties but also hinge on external environmental factors. This work investigated the tribological behaviors of FeCoNiCrAl_x (x = 0.1, 0.5, 1) sliding against Si₃N₄ ceramics under high temperature conditions. According to experimental findings, the tribological properties of FeCoNiCrAl_x were enhanced as the Al element content increased, particularly FeCoNiCrAl₁ could resist the material softening under high-temperature conditions to enhance the wear resistance. Based on the friction coefficient changes, wear morphology, phase composition, and chemistry element, the high-temperature wear mechanisms of FeCoNiCrAl_x were discussed including adhesive, attrition, and oxidative wear. These new studies will lead to the further improvement of tribological data of high-entropy alloys.     

4种生防菌对烟草黑胫病的防治效果及对根际土壤微生物群落结构的影响

为明确亚麻假单胞菌、沙福芽胞杆菌、暹罗芽胞杆菌和哈茨木霉菌对烟草黑胫病的防治效果以及对根际土壤微生物的影响,通过盆栽和大田试验考察了这些菌株的防治效果,并采用Illumina Miseq测序技术测定了烟株根际土壤微生物的多样性。结果表明：(1)与农药甲霜·锰锌相比,亚麻假单胞菌、沙福芽胞杆菌、暹罗芽胞杆菌及哈茨木霉菌在盆栽和大田试验中均表现出较高的相对防治效果,分别为95.0%和95.9%、96.2%和81.2%、90.9%和78.4%、88.7%和39.3%。(2)甲霜·锰锌和生防菌处理后的烟株根际土壤微生物多样性降低,细菌和真菌核心物种数量分别呈现上升和下降的趋势。(3)甲霜·锰锌药剂和生防菌处理不影响土壤中细菌和真菌优势菌群群落结构,但改变了土壤中菌群的丰度。     

医学影像计算机辅助检测与诊断系统综述

计算机辅助检测/诊断（Computer-aided Detection/Diagnosis, CAD）能提高诊断准确性,减少假阳性的产生,为医生提供有效的诊断决策支持.本文的主要目的是分析计算机辅助诊断工具的最新发展.文章以CAD研究较多的四大致命性癌症的发病医学部位为主线,按不同的成像技术和病类,对目前CAD在不同医学图像领域的应用进行了较为详尽的综述,从图像数据集、算法和评估方法等方面作多维度梳理.最后分析了医学图像CAD系统研究领域目前存在的问题并对此领域的研究趋势和发展方向进行展望.     

云南普洱茶保健功效的研究

简单介绍了普洱茶的品质特征，对普洱茶的保健功效在国内外的历史记载进行综述，分析了对普洱茶保健功效的影响因素。     

梯度掺杂GaN光电阴极的光谱响应测试与分析

用光谱响应测试仪得到了反射式梯度掺杂GaN光电阴极在激活和衰减过程中的光谱响应曲线,发现此曲线不断发生变化。在激活过程中光谱响应不断提高,且长波响应提高较快;衰减过程中光谱响应不断下降,长波响应下降得更快。结果表明：光谱响应曲线的变化与光电阴极高能光电子的逸出有关。GaN光电阴极发射的电子能量分布随入射光子能量升高而向高能端偏移,阴极表面势垒形状的变化对低能光激发电子的影响更大,导致光谱响应曲线随入射光波长改变而产生了不同的变化。     

基于平面点集的Voroni图的近似构造

现有的平面上点的Voronoi图的构造方法一般很难扩展到一般平面图形的Voronoi图的构造上。以平面点集中的每个点作为生长核,以相同的速率向外扩张,直到彼此相遇为止而在平面上形成的图形即为平面点集的近似的Voronoi图。在VC 6.0的环境下实现了该算法,并将其与分治法所得的结果进行了比较。该算法直观、计算简单,通用性好。对于一般的平面图形,选取有代表性的边界点,再按照平面点集中Voronoi图的近似构造方法,就可以得到一般平面图形的近似的Voronoi图。     

Re-determination of the crystal structure of Ca₂Y₈Si₆O₂₆ and study on the luminescent properties of Ca₂Y₈Si₆O₂₆:Tb³⁺

The crystal structure of silicate oxyapatite Ca2Y8Si6O26 was indexed as hexagonal,space group P63/m,a=0.93515 nm,c=0.67872 nm,α=β=90°,γ=120°,V=0.5138692 nm3.Three strong peaks located at 32.079o,32.595o,and 50.104o with d=2.7903,2.74649,1.8194 was in accordance with,(112),and(213) planes.The optimum concentration of Tb3+ in Ca2Y8Si6O26 to yield highest photoluminescence intensity was 10 mol.% of Y3+.The corresponding excitation spectrum consisted of an intense broad band from 220 to 260 nm.The photoluminescence measurements showed that the green emission originated from 5D4-7F5 was predominant in the measured range with strong doublet lines at 543 and 549 nm.     

野生艾蒿浸提物对金黄色葡萄球菌的抑制作用

利用水浸提法制得的艾蒿提取物采用滤纸片法和测OD值法对金黄色葡萄球菌进行了抑菌活性实验的研究.结果表明,艾蒿浸提物采用2种方法对金黄色葡萄球菌都有很好的抑制活性;且艾蒿提取物的抑菌效果与其自身浓度有关,高浓度的提取液抑菌作用强烈,反之则相对较弱.