摘要：A novel n-type junctionless field-effect transistor(JLFET) with a step-gate-oxide(SGO) structure is proposed to suppress the gate-induced drain leakage(GIDL) effect and off-state current I_(off).Introducing a 6-nm-thick tunnel-gateoxide and maintaining 3-nm-thick control-gate-oxide,lateral band-to-band tunneling(L-BTBT) width is enlarged and its tunneling probability is reduced at the channel-drain surface,leading the off-state current I_(off) to decrease ***,the thicker tunnel-gate-oxide can reduce the influence on the total gate capacitance of JLFET,which could alleviate the capacitive load of the transistor in the circuit *** simulation shows that I_(off) of the new optimized JLFET reduced significantly with little impaction on its on-state current Ion and threshold voltage V_(TH) becoming less,thus showing an improved I_(on)/I_(off) ratio(5×10^(4)) and subthreshold swing(84 mV/dec),compared with the scenario of the normal *** influence of the thickness and length of SGO structure on the performance of JLFET are discussed in detail,which could provide useful instruction for the device design.

摘要：较为详细的阐述了联醇生产中常见的碱度偏高的原因,对影响碱度各种因素加以分析,对精甲醇碱度的控制提出了自己的见解。

摘要：Nanofibers can mimic natural tissue structure by creating a more suitable environment for cells to grow,prompting a wide application of nanofiber *** this review,we include relevant studies and characterize the effect of nanofibers on mesenchymal stem cells,as well as factors that affect cell adhesion and osteogenic *** hypothesize that the process of bone regeneration in vitro is similar to bone formation and healing in vivo,and the closer nanofibers or nanofibrous scaffolds are to natural bone tissue,the better the bone regeneration process will *** general,cells cultured on nanofibers have a similar gene expression pattern and osteogenic behavior as cells induced by osteogenic supplements in *** involved in cell adhesion(focal adhesion kinase(FAK)),cytoskeletal organization,and osteogenic pathways(transforming growth factor-β(TGF-β)/bone morphogenic protein(BMP),mitogen-activated protein kinase(MAPK),and Wnt)are upregulated *** adhesion and osteogenesis may be influenced by several *** possess certain physical properties including favorable hydrophilicity,porosity,and swelling properties that promote cell adhesion and ***,nanofiber stiffness plays a vital role in cell fate,as cell recruitment for osteogenesis tends to be better on stiffer scaffolds,with associated signaling pathways of integrin and Yes-associated protein(YAP)/transcriptional co-activator with PDZ-binding motif(TAZ).Also,hierarchically aligned nanofibers,as well as their combination with functional additives(growth factors,HA particles,etc.),contribute to osteogenesis and bone *** summary,previous studies have indicated that upon sensing the stiffness of the nanofibrous environment as well as its other characteristics,stem cells change their shape and tension accordingly,regulating downstream pathways followed by adhesion to nanofibers to contribute to ***,additional experiments are needed to id

摘要：混合K边密度计作为一种用于核材料衡算的无损分析仪器,仪器测量部件的结构对测量结果影响较大。本文采用Geant4软件对混合K边密度计测量部件的结构参数及其样品测量进行蒙特卡罗模拟研究,模拟分析了X光管管压、滤片材料及厚度、X射线源-样品-探测器夹角及出射准直器材料、孔径、长度等因素对能谱的影响,确定了模拟装置的X光管管压为140 kV,滤片材料为Cd,滤片厚度1mm,X射线源-样品-探测器夹角为30°,出射准直器材料为W,孔径为2.5 mm,长度为1.5 cm;建立了纯U样品、纯Pu样品以及U/Pu混合样品的拟合曲线。模拟分析结果验证了模拟装置和建模模型的可靠性,为仪器实际结构设计提供了理论支撑。

摘要：目的 研究曲美他嗪对急性心肌梗死（AMI）患者窦性心率震荡（HRT）和心率变异性（HRV）的影响。方法AMI的患者共30对（60例），男22对，女8对；在急性心肌梗死稳定期（6～21天），若患者行血运重建，应在血运重建后，采用病例配对、随机进入交叉、单盲的试验设计；配对主要条件：性别、年龄、梗死部位及常规治疗情况，进入试验的患者，原治疗方案不变。HRT参数为震荡初始（TO），震荡斜率（TS）；HRV参数：24小时全部正常窦性R-R间期标准差（SDNN），24小时内每5分钟时间段窦性R—R间期平均值的标准差（SDANN），24小时全部正常窦性R—R间期差值的均方根（rMSSD），HRV三角指数（HRVTI）。结果分析采用交叉试验的方差分析。结果综合交叉试验结果，曲美他嗪处理组的HRT参数TO、TS得到明显改善（P〈0．05），HRV增加，与对照组比较差异均有统计学意义（P〈0．05），此外，曲美他嗪处理组的心功能也得到明显改善，与对照组比较差异均有统计学意义（P〈0．05）。结论 除常规治疗外，应用曲美他嗪能显著改善急性心肌梗死患者的窦性HRT和HRV，改善自主神经功能，具有不依赖于其他改善血流动力学药物的作用；改善缺血心肌细胞的能量代谢可能是此方面作用的主要基础。

摘要：Support vector machines（SVM） received wide attention for its excellent ability to learn, it has been applied in many fields. A review of the application of SVM in weld defect detection and recognition of X-ray image is been presented. We will show some commonly used methods of weld defect detection and recognition using SVM, and the advantages and disadvantages of each method will be discussed. SVM appears to be promising in weld defect detection and recognition, but future research is needed before it fully mature in this filed.

摘要：本文主要介绍了华南理工大学(SCUT)在激光选区熔化(SLM)成型设备以及医用金属材料SLM成型的基础研究与应用的最新成果。首先,采用DiMetal-100设备研究316L不锈钢、CoCrMo与Ti6Al4V三种医用金属粉末SLM成型的工艺参数、微观组织和力学性能。其次,详细介绍了SLM成型316L不锈钢在个性化舌侧正畸托槽和手术导板的应用,SLM成型CoCrMo在膝关节假体和牙冠牙桥的应用,以及SLM成型Ti6Al4V在骨盆骨折接骨板和个性化颅骨修复体方面的研究成果。最后,介绍了SCUT在SLM技术方面的发展方向和研究计划,具体包括实现新型多孔结构的SLM直接成型、实现多种材料SLM一次成型、实现SLM与减材复合成型、增加SLM设备的负反馈系统以及开发陶瓷和新型金属的SLM成型工艺。总结:SCUT对SLM设备及其医学应用进行了长期深入的研究,研究了医用金属材料316L不锈钢、CoCrMo合金以及Ti6Al4V合金的SLM成型工艺和微观组织,获得了性能优异的零件。SCUT成功将SLM成型的316L不锈钢应用于舌侧正畸托槽和手术导板,将SLM成型的CoCrMo合金应用于膝关节假体和牙冠牙桥,以及将SLM成型的Ti6Al4V合金应用于个性化接骨板和颅骨多孔修复体。其中,舌侧正畸托槽和牙冠固定桥已经进入商业应用。目前,SCUT正在进一步开展面向植入体内部结构的设计和制造技术研究,同时开始对SLM多材料成型、SLM与切削复合成型进行研究,并逐步开展SLM设备负反馈系统的开发及陶瓷、锌合金、镍钛合金等SLM成型工艺的研究等。

摘要：随着经济的发展,城市硬件与城市形象掀开一轮又一轮的建设高潮。河北省会石家庄在"三年大变样"战略部署下,城市面貌大为改观。户外广告与店面匾牌作为城市面貌、形象的重要组成部分,如何在现有成效基础上,围绕"建设具有实力、充满活力、富有竞争力……环境优美、服务完善、宜居宜看的繁荣、文明、和谐的新石家庄"的城市定位,探寻前瞻、长效、科学发展的工作路径变得十分迫切。

摘要：基于射频电子器件级碳纳米管阵列材料,研制出具备高增益、高线性特性的射频场效应晶体管,并对其进行了S参数提取、等效电路建模及匹配电路设计,实现了单级碳纳米管射频放大器电路。该电路在9 GHz点频增益达10.9 dB,增益1 dB压缩点处三阶交调优于-35 dBc。本文首次报道了X波段碳纳米管射频放大器电路,可为碳纳米管射频电子技术的发展提供技术参考。

摘要：介绍了慧鱼创意组合模型构成及应用,分析了慧鱼模型的两种控制方式———PLC控制和电脑控制。在慧鱼模型编程控制软件中,着重介绍了LLWin编程软件。结合生产实践用慧鱼模型搭建了自动物流分拣输送线,确定了系统的工艺流程和结构组成,对控制系统的硬件和软件进行了设计。模型运行结果符合设计要求。实践表明:应用LLWin编程软件对慧鱼创意组合模型编制控制程序方便快捷,极大地缩短了程序的编制和调试周期,有利于设计人员各种设计意图的快速实现和对设计方案的优化。慧鱼创意组合模型不仅可以应用于实验教学方面,在工程应用上也发挥着重要作用。