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。     

Design of 25 Gbit/s half-rate CDR with 1:2 demultiplexer for 100 GbE optical interconnects

A 25 Gbit/s clock and data recovery(CDR) circuit with 1:2 demultiplexer for 100 Gbit/s Ethernet(100 Gb E) optical interconnects has been designed and fabricated in Taiwan Semiconductor Manufacture Company(TSMC) 65 nm complementary metal-oxide-semiconductor(CMOS) technology. A novel quadrature voltage-controlled-oscillator(QVCO) structure adopts two pairs of transconductance cell and inverters to acquire rail-to-rail output swing. A half-rate bang-bang phase detector adopts four flip-flops array to sample the 25 Gbit/s input data and align the data phase, so the 25 Gbit/s data are retimed and demultiplexed into two paths 12.5 Gbit/s output data. Experimental results show that the recovered clock exhibits a peak-to-peak jitter of 7.39 ps and the recovered data presents a peak-to-peak jitter of 7.56 ps, in response to 312-1 pseudorandom bit sequence(PRBS) input. For 1.2 V voltage supply, the CDR circuit consumes 92 m W(excluding output buffers).     

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.     

冷拌冷铺超粘纤维磨耗层研究与应用

冷拌冷铺超粘纤维磨耗层作为一种新型技术,结合了微表处的材料特点和Novachip的施工工艺,具有优异的粘结性、防裂性、防水性、耐久性、环保性和经济性。本文从该项技术原理及性能要求、施工工艺及经济和社会效益进行了阐述。     

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。