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).     

Preparation of Silver Nanowires via a Rapid,Scalable and Green Pathway

Rapid synthesis of silver nanowires(Ag NWs) with high quality and a broad processing window is challenging because of the low selectivity of the formation of multiply twinned particles at the nucleation stage for subsequent Ag NWs growth.Herein we report a systematic study of the water-involved heterogeneous nucleation of Ag NWs with high rate(less than 20 min) in a simple and scalable preparation method.Using glycerol as a reducing agent and a solvent with a high boiling point,the reaction is rapidly heated to 210 ℃ in air to synthesize Ag NWs with a very high yield in gram level.It is noted that the addition of a small dose of water plays a key role for obtaining highly pure Ag NWs in high yield,and the optimal water/glycerol ratio is0.25%.After investigating a series of forming factors including reaction temperature and dose of catalysts,the formation kinetics and mechanism of the Ag NWs are proposed.Compared to other preparation methods,our strategy is simple and reproducible.These Ag NWs show a strong Raman enhancement effect for organic molecules on their surface.     

FINE:Future Internet iNnovation Environment

This article introduces FINE(Future Internet iNnovation Environment) project,which is supported by National High-tech R&D Program( "863" Program) of China.     

颗粒在椭圆形回转干馏炉内运动分析

通过实验研究颗粒在不同椭圆滚筒内的运动情况,分析了不同填充率、不同转速和不同颗粒粒径对其的影响。由实验得出:颗粒在椭圆不同位置的运动情况并不一致,随着长短轴之比变大,运动趋于平缓;填充率降低会引起颗粒运动模式过渡区间变大,进入小瀑布模式所需转速增加;颗粒粒径增大,颗粒在筒内受重力、摩擦力的影响变得更加明显,在长轴垂直水平位置,所受惯性影响更加显著,并出现明显的多种模式相结合的运动形式。     

Nano-HA/PLA复合材料的制备与性能评价

采用均匀沉淀法制备纳米羟基磷灰石（nano-HA）粉末.采用溶液共混-超声分散（SUD）-溶剂挥发法,制备纳米羟基磷灰石（nano-HA）/聚乳酸（PLA）复合材料薄膜,并对其均匀性、热性能等进行研究.结果表明,材料分散均匀,纳米羟基磷灰石与聚乳酸基体之间结合良好.     

煤矿用无机固化发泡材料的制备

研究了所制备发泡剂与材料干密度的关系,发现发泡剂掺量＜1.5％,成型良好;大于该值后,干表观密度显著下降;材料配比中砂、粉煤灰按照0.54,2∶1的比例调试,发现与水泥净浆相比抗压强度有所下降,但是其容重有所增加;早强剂的用量增加,其凝固时间明显缩短,对后期抗压强度影响不大.最后通过实验筛选出干密度分别为800,900,1 000 kg/m3的材料配比进行相关性能测试,测试发现该发泡材料具有前期强度和28 d龄期抗压强度高的特点.     

TDI双管板换热器制造质量的控制简

介绍了TDI双管板换热器的结构特点和深孔强度胀接技术。简述了制造过程中的质量控制关键点。通过用模拟管板进行了内管板胀接工艺评定的方法,采取了控制管孔加工精度、强度胀接、管板组装、调整开槽间距及宽度、安排合理的胀接焊接次序、选择合适的胀接压力等措施;采用了新的检验和检测技术,保证了产品质量;增设了压力传感器,完善了安全监测系统。     

高寒地区节能住宅

简述了高寒地区一种新型节能住宅的设计,这种住宅建筑造价低,易于推广。     

基于热气机分布式冷热电三联供效益分析

以上海地区一幢典型五层住宅建筑热、电、冷负荷需求为计算基础,分别计算了基于热气机的冷热电三联供系统和传统冷热电分供系统的一次能耗率、全年净收益以及投资回收期,验证了三联供系统的节能性和经济性。分析表明热气机余热利用率和能源价格是影响该三联供系统节能效益和经济效益的主要因素。     

景迈山古茶林文化景观保护修复设计

1项目背景景迈山位于中国滇西南地区怒山余脉形成的群山之中,三面被澜沧江支流南门河及南朗河环绕,是相对独立的地理单元。当地属于中山海拔、季风气候,干湿季分明。2012年,“普洱景迈山古茶林文化景观”被列入中国世界遗产预备名录,2021年被推荐为2022年中国申报世界遗产项目。