完全wrpp半群的性质及特征

在深入研究完全rpp半群和C-wrpp半群的基础上,定义了局部C-wrpp半群和局部C-wrpp-E-半群,得到了完全wrpp半群的一些重要性质及特征,即在同余关系η下,完全wrpp半群S的商半群S/η是C-wrpp半群;S是完全wrpp半群当且仅当S是局部C-wrpp-E-半群.     

Hydrogen absorption behavior of TA15 alloy

The hydrogen absorption kinetics of TA15 titanium alloy at 973–1123 K was studied using a tube-type hydrogen treatment furnace. The hydrogen absorption kinetic curves obtained were analyzed according to a series of mechanism equations to reveal the kinetic parameters and mechanism of the hydrogen absorption process. The results show that both the hydrogen absorption rate and the equilibrium hydrogen pressure increase and the time to reach equilibrium is shortened with increasing temperature. It is found that only the second hydrogen absorption period exists in the hydrogen absorption process of TA15 alloy between 973 and 1123 K, and the activation energy is 54.889 kJ/mol for hydrogen absorption. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results demonstrate that δ hydride forms between 973 and 1123 K, and β phase decreases with the increase of temperature. Orthorhombic α″ martensite is generated at 1073-1123 K, and their amount increases with increasing temperature.     

一类具有Alee效应捕食-食饵系统的动力学性质分析

对具有Allee效应的反应扩散方程组进行了详细的动力学分析,利用最大值原理,比较原理得到了非负解的存在唯一性;当参数满足一定条件时,给出了解的最终趋势.     

Optimization and application of blasting parameters based on the “pushing-wall” mechanism

The large structure parameter of a sublevel caving method was used in Beiminghe iron mine. The ores were generally lower than the medium hardness and easy to be drilled and blasted. However, the questions of boulder yield, "pushing-wall" accident rate, and brow damage rate were not effectively controlled in practical blasting. The model test of a similar material shows that the charge concentration of bottom blastholes in the sector is too high; the pushing wall is the fundamental reason for the poor blasting effect. One of the main methods to adjust the explosive distribution is to increase the length of charged blastholes. Therefore, the field tests with respect to increasing the length of uncharged blastholes were made in 12# stope of -95 subsection and 6# stope of Beiminghe iron mine. This paper took the test result of 12# stope as an example to analyze the impact of charge structure on blasting effect and design an appropriate blasting parameter that is to similar to No.12 stope.     

A model for estimating the viscosity of blast furnace slags with optical basicity

Viscosity is an important physical property of blast furnace slags and has a great influence on blast furnace operations. Because of time consumption and difficulties encountered during high temperature experimental measurement, viscosity data are also limited, so a reasonable and accurate estimation model is required to provide the data for controlling and optimizing the blast furnace process. In the present study a viscosity model was proposed for blast furnace slags. In the model the activation energy was calculated by the optical basicity corrected for cations required for the charge compensation of AlO₄5-, and the temperature dependence was described by the Weymann-Frenkel equation. The estimated viscosity values of the CaO-Al₂O₃-SiO₂, CaO-Al₂O₃-SiO₂-MgO, and CaO-Al₂O₃-SiO₂-MgO-TiO₂ systems fit well with experiment data, with the mean deviation less than 25%.     

应用光学原理研究原油沥青的聚沉过程

利用Turbiscan Lab 稳定性分析仪研究了原油/甲苯混合体系的稳定性。将不同加量的沉淀剂应用于1：9 的原油/甲苯混合体系中,通过测量原油/甲苯的透射光和背散射光强度随时间的变化,可描述混合体系中沥青的聚集和沉淀过程,有助于分析原油不稳定性发生的机理,并定量分析了沥青聚沉过程中的颗粒粒径大小、粒径增大速率和颗粒沉降速率等。实验表明,随着沉淀剂的加量从80.0% 增加到90.9%,混合体系中沥青的聚集速率从192.216 μm/min 增加到5 332.120 μm/min,粒径从10.0 μm 增大为53.4 μm ,沉积速率从0.17 mm/min 增加到0.46 mm/min。     

基于IBM Q平台的量子图像算法研究

为使量子图像处理算法在量子计算机上得到验证与发展,结合IBM量子实验平台(IBM Q)上量子计算操作与量子图像处理理论的研究,设计了一种基于IBM Q平台的量子图像分割方法.提出了一种基于新型强化量子图像表达式(NEQR)的改进型强化量子图像表达式(IEQR),并根据IEQR表达式初始化量子图像分割电路.该电路由量子比较器(QBSC)和受控旋转门(Cswap)构成.最终在IBM Q和本地经典计算机仿真两种平台下实现了2×2和4×4大小的量子图像分割,实验结果表明了该算法的可行性和有效性,并验证了量子计算机的优越性.     

基于企业经营机制视角的经济转轨进程中的环境效应研究——以山东省为例

改革开放以来,山东省经济体制逐步由计划经济体制向市场经济体制过渡,在经济转轨的过程中,企业经营机制也发生了深刻的转变,企业经营机制变革在企业所有制、企业规模和企业社会责任方面表现尤为明显,企业运行模式的改变产生了不同的环境效应,笔者从企业经营机制视角分析经济转轨进程中的环境效应,比较不同所有制和不同规模企业的环境效应规律,并深入分析企业社会责任在可持续发展方面的作用,这对于山东省可持续发展机制的建立以及生态山东建设有重要的借鉴意义．     

时变风中Spar平台系泊系统的耦合动力分析

在中国南海东部百年一遇的台风海况下,考虑不同风载荷的计算方式,对某Classic-Spar平台及其系泊缆索的动力响应作了时域非线性数值模拟.首先将平台频域水动力结果变换到时域;然后运用非线性有限元方法计算张紧式系泊缆索的动张力特性;最后运用四阶龙格-库塔法在时间域内计算平台及其系泊系统的非线性耦合运动方程.分析结果表明:在时变风的作用下,平台运动不仅会偏离平衡位置,而且由于时变风的特征频率通常在Spar平台水平面运动的自振频率附近,因此相对于稳态风,考虑时变风的影响将会激起平台大幅度的水平面慢漂运动响应,从而诱发很大的系自张力.     

Precise measurement of stable (δ 88/86Sr) and radiogenic (87Sr/86Sr) strontium isotope ratios in geological standard reference materials using MC-ICP-MS

A new method for high-precision measurements of stable (δ88/86Sr) and radiogenic (87Sr/86Sr) Sr isotope ratios was developed on the MC-ICP-MS using a standard-sample-standard bracketing protocol. By carefully monitoring and controlling the accumulation of the on-peak backgrounds (i.e. the carryover memory) on the instrument, our method can provide an external precision of around 0.010‰ to 0.014‰ for 88/86 Sr measurements. Such precision is comparable to that achieved by double-spike TIMS method (DS-TIMS), and 2-3 times better than those of the previously reported results by MC-ICP-MS without spiking. The results of the standard seawater IAPSO are also identical to those by DS-TIMS. However, our method is more advantageous, efficient and convenient to use for routine Sr isotopic analysis than the DS-TIMS method as there is no need to prepare and calibrate the 84Sr-87 Sr double spike. Using this method, we measured the δ88/86Sr values in a series of international geological rock standards, which show large variability, with the lowest value (0.20‰) registered in JG-2, a terrestrial granite, and the highest value (0.539‰) in UB-N, a serpentinite. This may provide an additional means for isotopic characterization of geological processes, adding a new dimension over the traditional use of radiogenic Sr isotopic ratio 87Sr/86Sr.