基于滑动的齿轮摩擦问题的研究

推导了渐开线圆柱齿轮副相对滑动率的计算公式 ,分析了相对滑动率对齿轮磨损、相啮合的摩擦力矩与弹流润滑等问题的影响     

进化神经网络在矿山入选品位优化中的应用

在矿山入选品位指标研究中，正确建立有关因素之间的数学模型是实施优化的关键。其中选矿子系统的入选品位、混岩率与选比之间呈复杂非线性关系。为克服一般神经网络收敛慢和过学习的问题，采用改进遗传算法的进化神经网络模型映射混岩率、入选品位与选比之间的复杂非线性的对应关系，并将建立的选比神经网络模型用于金山店铁矿入选品位的优化决策支持系统中，取得每年多回收铁精矿16.23万t的良好效果。     

空间模式下初始气固速度比影响管内固粒加速特性的研究

推导出了不同初始速度的固粒群空间模式的运动解析关系并求解,通过对解析关系 的分析,研究了影响固粒加速特性的因素.给出了初始气固速度比对固粒加速输送速度影响的若干 结论,其结果对工程应用有指导意义。     

水泥稳定碎石基层的施工质量控制

概述了水泥稳定碎石基层的特点.从材料、配合比以及施工等方面,论述了水泥稳定碎石基层的施工质量控制措施.     

BiLaWO6: Er3+/Tm3+/Yb3+ phosphor: Study of multiple fluorescence intensity ratiometric thermometry at cryogenic temperatures

Highly thermally stable Er³⁺/Tm³⁺/Yb³⁺ tri-doped bismuth lanthanum tungstate phosphors were prepared by high temperature solid-state reaction method. The structural and morphological properties of the prepared phosphors were analysed by X-ray diffraction (XRD), Raman spectroscopy and Scanning electron microscopy (SEM) coupled with energy dispersion spectrum (EDS). Visible upconversion (UC) luminescence was measured by exciting the phosphors with 980 nm laser radiation. The dependence of the UC intensity of each emission band of Er³⁺ and Tm³⁺ ions as a function of temperature in the range from 30 to 300 K was monitored. Fluorescence intensity ratios (FIR) of thermally coupled levels (TCL) and non-thermally coupled levels (NTCL) were analysed and verified with appropriate theoretical validation. The absolute (S_A) and relative sensitivities (S_R) were estimated and compared with the reported systems. In the present case of BiLaWO₆: Er³⁺/Tm³⁺/Yb³⁺, S_R (0.43 % K^?1) related to TCL of Er³⁺ UC is found to have maximum sensitivity compared to any of the NTCL combinations at 300 K. From this study we inferred that the S_R values estimated from NTCL are smaller than that of TCL involved in BLW: Er³⁺/Tm³⁺/Yb³⁺ phosphor. The temperature dependent CIE color coordinates were also evaluated in the cryogenic temperature region.     

关于天然气管网安全掺氢比10%的商榷

大力发展氢能是实现“碳达峰、碳中和”目标的重要途径之一。将氢气掺入现有天然气管网利于实现氢能经济高效、大规模输送与应用。安全掺氢比是掺氢天然气管输系统有待解决的关键问题之一。有观点提出当掺氢天然气中的掺氢比在10%以下时,可无需加以验证地直接通过天然气管网输送。本文提出从目前来看,该观点不成立。文章从管网系统掺氢适应性、示范项目掺氢比探讨和标准规范3个方面阐述了个中缘由。文中指出,掺氢天然气管输技术正处于起步阶段,其安全保障还面临诸多挑战,任何结论都需要经过反复论证和验证,以稳步推动氢能产业发展。     

钢渣基多孔地质聚合物的制备及吸附性能研究

以钢渣为主要原料,水玻璃为激发剂,H₂O₂为发泡剂,制备多孔地质聚合物材料。采用XRD、FTIR、SEM、BET等对原料及最终试样进行表征,研究钙硅比、激发剂和H₂O₂掺量对该材料性能的影响。将所制备的多孔地质聚合物用作吸附剂,初步考察该材料对Cu²⁺的吸附效果。试验表明:当钙硅比为1.0,水玻璃掺量为20.4%(质量分数),发泡剂掺量为4%(质量分数)时,该材料性能良好,总孔隙率86.4%,抗压强度0.5 MPa,体积密度0.408 g/cm³,体积吸水率56.31%,钢渣使用率65.85%,比表面积与孔容显著提高。吸附结果显示:该材料对Cu²⁺吸附效果良好,去除率可达91.44%,平衡吸附量达到15.239 mg/g,吸附过程符合准二级动力学模型。     

UHPC浆体的工作性和流变性与颗粒膜层厚度的关系

建立超高性能混凝土(UHPC)浆体的工作性和流变性之间的关系可从理论上研究其工作性变化规律。本文以颗粒膜层厚度为UHPC浆体的工作性的综合衡量指标,设计了正交试验,研究水胶比、超细粉煤灰替代率和硅灰掺量对UHPC浆体的工作性与流变性的影响。根据流动度和流变性测试结果,分析了水胶比和超细粉煤灰替代率的共同作用对UHPC浆体的工作性与流变性的影响,探究了UHPC的净浆与砂浆的工作性关系,基于浆膜层厚度给出了UHPC砂浆的工作性与流变性的关系式。研究结果表明:水胶比是UHPC浆体的工作性与流变性的最主要影响因素,水胶比、超细粉煤灰替代率和硅灰掺量提高均造成UHPC浆体的颗粒表面膜层厚度增大;水胶比和超细粉煤灰替代率的共同作用下,UHPC浆体的流动度和黏度系数具有相关性。     

Effects of Y2O3/MgO ratio on mechanical properties and thermal conductivity of silicon nitride ceramics

In this work, the effects of Y₂O₃/MgO ratio on the densification behavior, phase transformation, microstructure evolution, mechanical properties, and thermal conductivity of Si₃N₄ ceramics were investigated. Densified samples with bimodal microstructure could be obtained by adjusting the ratio of Y₂O₃/MgO. It was found that a low Y₂O₃/MgO ratio facilitated the densification of Si₃N₄ ceramics while a high Y₂O₃/MgO ratio benefited the phase transformation of Si₃N₄ ceramics. Best mechanical properties (flexural strength of 875 MPa, and fracture toughness of 8.25 MPa·m^1/2, respectively) and optimal thermal conductivity of 98.04W/(m·K) were achieved in the sample fabricated with Y₂O₃/MgO ratio of 3:4 by sintering at 1900°C for 4 h.     

Optimising the oil phases of aluminium hydrogel-stabilised emulsions for stable,safe and efficient vaccine adjuvant

To increase antibody secretion and dose sparing, squalene-in-water aluminium hydrogel (alum)-stabilised emulsions (ASEs) have been developed, which offer increased surface areas and cellular interactions for higher antigen loading and enhanced immune responses. Nevertheless, the squalene (oil) in previous attempts suffered from limited oxidation resistance, thus, safety and stability were compromised. From a clinical translational perspective, it is imperative to screen the optimal oils for enhanced emulsion adjuvants. Here, because of the varying oleic to linoleic acid ratio, soybean oil, peanut oil, and olive oil were utilised as oil phases in the preparation of aluminium hydrogel-stabilised squalene-in-water emulsions, which were then screened for their stability and immunogenicity. Additionally, the underlying mechanisms of oil phases and emulsion stability were unravelled, which showed that a higher oleic to linoleic acid ratio increased anti-oxidative capabilities but reduced the long-term storage stability owing to the relatively low zeta potential of the prepared droplets. As a result, compared with squalene-in-water ASEs, soybean-in-water ASEs exhibited comparable immune responses and enhanced stability. By optimising the oil phase of the emulsion adjuvants, this work may offer an alternative strategy for safe, stable, and effective emulsion adjuvants.