课程文献中心 更多>>

标准号: YS/T 872-2023

摘要： 本文件规定了镓中汞、砷含量的测定方法。本文件适用于镓（99.9%≤wGa≤99.99999%）中汞、砷含量的测定，汞含量测定范围为0.0040μg/g～15.00μg/g；砷含量测定范围为0.0050μg/g～15.00μg/g。

标准号: YS/T 739.5-2023

摘要： 本文件规定了铝电解质中氟化锂含量的测定方法。本文件适用于铝电解质中氟化锂含量的测定。测定范围为0.020%～12.00%。

标准号: YB/T 6119-2023

摘要： 本文件规定了加热炉黑体强化辐射技术的术语和定义、基本原理、工作环境、黑体元件、安装技术、安全与环保、施工验收要求、效果评价和运行维护。本文件适用于轧钢加热炉，其他热处理炉可参照执行。

标准号: YS/T 273.5-2023

摘要： 本文件规定了冰晶石中钠含量的测定方法。本文件适用于冰晶石中钠含量的测定。测定范围为15.00%～35.00%。

标准号: HG/T 6227-2023

摘要： 本文件规定了用波长色散X射线荧光光谱法测定催化裂化催化剂中化学成分的方法。本文件适用于催化裂化、催化裂解催化剂化学成分的测定。

标准号: YS/T 1673-2023

摘要： 本文件规定了铜熔炼渣中铜、铁、硫、二氧化硅、砷、铅、锌、锑、铋、镍、氧化钙和氧化镁含量的测定方法。本文件适用于铜熔炼渣中铜、铁、硫、二氧化硅、砷、铅、锌、锑、铋、镍、氧化钙和氧化镁含量的测定。

标准号: YS/T 1657.2-2023

摘要： 本文件规定了高硫渣中银含量的测定方法。本文件适用于高硫渣中银含量的测定。方法1测定范围为50g/t～500g/t；方法2测定范围为＞500g/t～1500g/t。

标准号: YS/T 739.1-2023

摘要： 本文件规定了铝电解质中元素含量的测定方法。本文件适用于铝电解质中氟、铝、钠、钙、钾、镁、二氧化硅、三氧化二铁含量的测定。

关键词： 防护水平剂量率   空腔电离室   能量响应   漏电流   蒙特卡罗模拟  

摘要： 防护水平电离室广泛应用于核设施、放射治疗和辐射环境监测等剂量率的测量，为了提高防护水平电离室的国产化水平，设计了测量防护水平剂量率的空腔电离室。通过理论计算、蒙特卡罗模拟对电离室的室壁厚和保护极进行研究。在不同能量辐射场中对电离室性能进行测试，测试结果表明：电离室漏电流绝对值小于5 fA，工作坪区为200～800 V。在N60～N250的X辐射场和137Cs、60Co γ辐射场中对电离室的能量响应进行测试，当剂量率归一化到60Co时，电离室能量响应相对偏差在±5%之内，电离室在半年内的长期稳定性和角响应都优于0.5%。所述电离室能够实现3 mGy/h～30 Gy/h剂量率的测量，且与约定剂量率相对偏差优于±5%。

摘要： This thesis reviews and compares evaluation standards, distress manifestation manuals, and key performance indices for flexible road asset management across North America. Evaluation of pavement structural and functional conditions for a road section is one of the crucial steps in determining pavement maintenance and rehabilitation strategies, as well as investment plans for road asset management. However, different evaluation methods applied to the same road section may result in notable variations of pavement condition assessments, as investigated by this study, and this often varies with different regions and road agencies. In this thesis, sixteen pavement condition rating manuals are reviewed to identify differences and similarities. A trend of simplification in the pavement evaluation process is observed in pavement rating manuals, and a potential solution involving the reduction in the types of pavement distresses, according to their manifestation correlation, is proposed. The thesis also explores a new method for assessing ride quality through vibration frequency analysis. The evaluation processes generally consist of four components: surface distress, roughness, safety evaluation, and structural strength. Roughness, as a critical factor directly influencing the driving experience, has a close correlation with ride comfort. However, the existing pavement roughness assessment method lacks a correlation with vehicle vibration, thereby restricting its capacity to comprehensively reflect its influence on ride comfort. A car simulation model is constructed using MATLAB Simulink, and 20 road sections are tested. The simulation's vibration signals are analyzed in the frequency domain using Fast Fourier Transform (FFT). A new index, the Ride Resonance Index (RRI), is introduced based on human resonance effect evaluation in the frequency domain during driving. A moderate linear relationship is found between RRI and pavement roughness. In summary, the diversity of eval