影像导引肝脏恶性肿瘤多模态消融治疗技术专家共识

影像导引肝脏恶性肿瘤多模态消融治疗是以医学影像技术为导引，在冷冻消融与热消融交替转换过程中，通过对病灶区温度精准控制和消融过程定量规划，彻底破坏原位肿瘤细胞及其循环系统，同时最大程度释放活性肿瘤抗原，从而达到控制肝脏恶性肿瘤复发转移的目的。为规范肝脏恶性肿瘤多模态消融治疗技术操作，便于不同层级医院开展实施，确保医疗安全和临床疗效，中国抗癌协会肿瘤介入学专业委员会和上海市抗癌协会实体肿瘤聚焦诊疗专业委员会组织国内肿瘤治疗领域的多学科专家共同参与，认真讨论，最终达成本共识。     

Oxoiron(V) Complexes of Relevance in Oxidation Catalysis of Organic Substrates

The selective oxidation of alkane and olefin moieties are reactions of fundamental importance in both chemical synthesis and biology. Nature efficiently catalyzes the oxidation of hydrocarbons using iron-dependent enzymes, which operate through the mediation of oxoiron(IV) or oxoiron(V) species. In the quest for chemo, regio and stereoselective transformations akin to those taking place in nature, bioinspired iron catalysts have been developed and understanding their mechanism of action has become a particularly relevant area of research. While a prominent advance in the preparation and characterization of oxoiron(IV) species has been accomplished, oxoiron(V) species remain exceedingly rare, presumably because the high reactivity that makes them particularly interesting also makes them difficult to observe. This review summarizes the advances in the field, focusing in synthetic systems for which the oxoiron(V) species relevant in these transformations have been directly detected and spetroscopically characterized.     

2019 Annual Report of China''s Paper Industry

According to the 2019 annual report of China’s Paper Industry by China Paper Association (CPA), in 2019, there were about 2700 paper & board manufacturers in mainland China. The total production of paper & board was 107.65 million tons, increased by 3.16% and the total consumption was 107.04 million tons, increased by 2.54% compared with 2018, respectively, paper & board per capita consumption was 75 kg (counted in 1.4 billion people). This report includes a rather elaborate analysis of the China’s paper industry and is provided for the readers’ reference.     

浅谈ZY5000／14／23型掩护式液压支架的设计

总结大同煤矿集团公司ZY5000／14／23型二柱掩护式液压支架设计的经验,着重阐述了针对近距离煤层“两硬”条件设计支架的技术思路,介绍了支架的性能、结构特点及生产使用情况。     

特厚坚硬高瓦斯大断面综放切眼锚网锚索耦合支护实践

根据现场工程地质条件调查分析、岩石物理力学特性和特厚坚硬高瓦斯大断面综放切眼围岩力学变形机制及其转化研究,提出了特厚坚硬高瓦斯综放工作面巷道锚网锚索耦合支护设计方案。根据试验结果,证明在白芨沟矿采用锚网锚索耦合支护技术在技术上是可行的、安全上是可靠的、经济上是合理的。     

Research on product size and grinding dynamics of vibration mills

In order to improve vibration mills grinding effect and increase productive efficiency, prime factors of vibration mills were gained much attention. The purpose of this study is to reveal product size distribution and grinding dynamics of vibration mills by orthogonal experi-ments. The metallurgical refractory materials were used as research object. In order to explore the relationships between grinding effect and primary factors, lots of milling experiments were carried out. Based on the results, the conclusions can be summarized： as time runs, the size distri-bution shows exponential trend, and range becomes more and more narrow. Also the quantitative analysis result between grinding effect and primary factors was obtained by non-linear regres-sion： high frequency, high amplitude and low fill ratio can increase grinding speed.     

双柱塞砂浆泵补偿机构的运动分析和仿真

介绍了双柱塞砂浆泵的工作原理，通过对采用摆动滚子从动件的凸轮机构的双柱塞砂浆泵的工作凸轮机构和补偿凸轮机构进行运动学分析，建立了砂浆泵运动机构的仿真模型．用Matlab软件进行了仿真分析，进一步验证了运动学分析模型的正确性．     

矿压显现对工作面瓦斯涌出规律影响分析

文章通过对煤层瓦斯存在形态、采空区瓦斯分布规律和矿压显现对煤层瓦斯存在形态及采空区瓦斯分布影响进行定性分析,解释矿压显现对工作面风流中的瓦斯浓度变化原因。为煤矿瓦斯管理及工作面周期来压的预测预报提供科学理论依据和方法。     

大倾角特厚煤层综放支架防倒防滑安全保障技术

基于古山矿三井大倾角特厚煤层的地质条件,围绕综放面装备防倒防滑的技术难点,从液压支架结构、工作面布置方式、放煤工艺、工作面管理等方面进行了研究,并制定了安全保障技术。主要保障技术:端头3架组成锚固站,作为工作面支架纵向稳定性的基础;支架安装高强度双侧可调活动侧护板,并设置底座调节机构;工作面采用"倾斜-圆弧过渡-水平"的布置方式,减小工作面机头坡度,保证机头支架的稳定性;通过放煤工艺优化模拟,确定采用"单向割煤,二采一放"的放煤方式,以控制支架下滑;沿着工作面倾斜方向,工作面上部由上而下放煤以保持支架的稳定性;工作面其他地段由下而上放煤有利于提高顶煤回收率。工业性试验表明,综放面设备稳定性良好,顶煤回收率达80%,实现了大倾角综放面的安全高效回采,对于类似地质条件的综放装备防倒防滑具有借鉴意义。