对大倾角复合顶板综采技术问题的探讨

通过对平煤八矿在大倾角复合顶板条件下,综采面在开采中存在的生产技术问题分析,探讨了改进和解决办法,并为大倾角综采面开采技术的发展,提出几点认识和建议。     

知名抗性淀粉的热性质分析[Ⅱ]

采用热失重法(TG)和差示扫描量热分析技术(DSC)对罗盖特Nutriose?抗性淀粉进行热性质分析。TG曲线显示该抗性淀粉在296.73℃开始分解,314.77℃分解速度最快,332.81℃是分解的最终温度。DSC吸热曲线显示,样品第一次分析曲线在29.04℃出现吸热峰,在61.64℃出现冷结晶放热峰,在74.67℃左右开始出现吸热峰,相变高峰温度约在81.92℃(相变焓267.1J/g),另外在219.89℃出现小的吸热峰;分析系统经快速降温后,样品的第二次分析曲线在31.22℃开始出现吸热峰,相变高峰温度约在86.39℃(相变焓38.97J/g),在218.70℃仍然出现一个小的吸热峰,冷结晶吸热峰消失,表明样品经过热处理后,晶体结构发生变化。     

添加Y2O3-Al2O3烧结助剂的氮化硅陶瓷的超高压烧结

以Y2O3-Al2O3体系为烧结助剂,在5.4～5.7 GPa,1 570～1 770K的高温高压条件下进行了氮化硅陶瓷的超高压烧结研究.用X射线衍射及扫描电镜对烧结样品进行了分析和观察,探讨了烧结温度及压力对烧结的陶瓷样品性能的影响.结果表明:得到的氮化硅由相互交错的长柱状β-Si3N4晶粒组成,微观结构均匀,α-Si3N4完全转变为β-Si3N4.经5.7GPa,1 770K且保温15min的超高压烧结,样品的相对密度达99.0%,Rockwell硬度HRA为99,Vickers硬度HV达23.3GPa.     

AP包覆超细硼粉的改进方法

采用沉积法,以甲醇、丙酮为溶剂,AP为主要原料,对超细硼粉进行包覆。研究了溶剂、蒸发速率及氨基硅烷偶联剂对包覆效果的影响,并采用红外光谱、热分析、原子力显微镜、透射电镜等手段分析了包覆效果。结果表明,最佳的蒸发速率为10g.h-1;包覆前先对硼粉进行硅烷偶联剂预处理,会使硼粉的表面沉积更均匀,包覆效果更好;包覆后硼粒子表面规整,而且外表面存在较明显的包覆层。     

SSIG: Single-Sample Information Gain Mo del for Integrating Multi-Omics Data to Identify Cancer Subtypes

Different living environments of cancer samples lead to different molecular mechanisms of cancer development, which in turn leads to different cancer subtypes. How to identify cancer subtypes is a key issue for the realization of precision medicine. With the development of high-throughput technologies, multi-omics data which can better understand different causes of cancer have emerged. However, the current methods of analyzing cancer subtypes using multi-omics data is mostly derived from population cancer sample data and ignores the differences between different cancer samples. Therefore, the joint analysis of multi-omics based on a single sample may reveal more information about the differences between individual cancers. A strategy for identifying cancer subtypes is proposed based on Single-sample information gain (SSIG) which construct sample feature matrix by considering the heterogeneity of sample. Applying this strategy to current popular subtype identification methods, cancer subtypes can be identified more accurately and the mechanism of cancer can be found from the perspective of a single sample. By comparing different methods in different clustering measure, and using survival analysis, it is shown that SSIG is more suitable for cancer subtype identification than the original multi-omics data, and it is easier to mine the cancer subtype classification mechanism hidden behind the data.     

质子在砷化镓材料中产生位移损伤的Geant4模拟

本文使用Geant4模拟了1、5、10、20、50、100、500、1000 MeV能量的质子入射GaAs的位移损伤情况。随入射质子能量的增大,产生的初级离位原子（PKA）数目增加、种类增多;PKA能谱分布总体上呈递减趋势,PKA在低能量区间所占份额降低,在高能量区间所占份额升高。研究结果表明,辐射缺陷浓度在质子入射方向上遵循布拉格规律。     

帕尔旺灌溉工程混凝土缺陷修复技术

阿富汗帕尔旺(Parwan)灌溉工程受战争破坏,年久失修.对该工程的混凝土管道和渠道,采用了多种措施和材料加以修复,使其恢复原有的灌溉功能,详情予以介绍.     

地质灾害防治工程监理实践与问题探讨

结合三峡库区二期地质灾害防治工程监理实践分别对地质灾害防治工程监理的特征、内容、作用等方面进行了分析。     

Analysis on Availability of the Carbon Element in Alcohol Production

According to the concept of circular economy, the mass integration of alcohol production was investigated though the analysis of the carbon element contained in raw material cassava. Through the mass integration, the distillage wastewater turned into carbon resource and produced a great deal of by-product biogas while its chemical oxygen demand (COD) was reduced from 50000 mg/L to not more than 300 mg/L, the local secondary effluent standards, and other by-products such as CO2 (liquidized) and fusel oil were recovered. In the way, the consumption of raw material was only 2.2 tons cassava to produce 1 ton alcohol (96%, j) in the case study, much lower than the average level 2.92 t/t in China. The carbon element balance for production of alcohol was made through testing the concentrations of the carbon element of all mass flows. The results showed that the mass integration helped the availability of the carbon element increased from 44.74% to 64.75%.     

黑河地区俄网按功率减载的区域稳定控制

黑龙江省黑河地区通过110 kV布黑线从俄罗斯阿穆尔州购进电力,根据季节不同,俄罗斯电网向中方输送电力有功率限额.阐述了安全稳定控制装置、远方信号传输装置的功能,及黑河地区俄网按功率减载的安全稳定控制实施方案和运行效果.