复合式深基础的支护技术

采用二级降水、三层支护和入坑打桩方式，以常规技术实现了超深基坑的施工。     

从宫崎骏的感官世界看中国动漫产业发展之瓶颈

如果说文化产业是“朝阳产业”,动漫产业则是这轮朝阳上绚丽的霞光。动漫产业,是指以“创意”为核心,以动画、漫画为表现形式,包含动漫图书、报刊、电影、电视、音像制品以及生产和经营与动漫形象有关的衍生产品的产业。面对资金、技术、人才、创意、市场、体制等中国动漫业的诸多瓶颈,我们需要更深入的思考。     

Materials characterization of WNxCy, WNx and WCx films for advanced barriers

A ternary WN_xC_y system was deposited in a thermal ALD (atomic layer deposition) reactor from ASM at 300 °C in a process sequence using tungsten hexafluoride (WF₆), triethyl borane (TEB) and ammonia (NH₃) as precursors. The WC_x layers were deposited by a novel ALD process at a process temperature of 250 °C. The WN_x layers were deposited at 375 °C using bis(tert-butylimido)-bis-(dimethylamido)tungsten (^tBuN)₂(Me₂N)₂W (imido-amido) and NH₃ as precursors. WN_x grows faster on plasma enhanced chemical vapor deposition (PECVD) oxide than WC_x does on chemical oxide. WN_xC_y grows better on PECVD oxide than on thermal oxide, which is opposite of what is seen for WN_x. In the case of the ternary WN_xC_y system, the scalability towards thinner layers and galvanic corrosion behavior are disadvantages for the incorporation of the layer into Cu interconnects. ALD WC_x based barriers have a low resistivity, but galvanic corrosion in a model slurry solution of 15% peroxide (H₂O₂) is a potential problem. Higher resistivity values are determined for the binary WN_x layers. WN_x shows a constant composition and density throughout the layer.     

Advances in Polymer-Filler Composites: Macro to Nano

It has been long known that polymers can be mixed with clay minerals, however, the ideas of microcomposites have been expanded recently to a new and emerging class of clay-filled polymers, called Polymer-Clay Nanocomposites (PCN), which has experienced the real breakthrough early in the past decade only. This is a novel class of composites that are particle-filled polymers for which at least one dimension of the dispersed particles is in the nanometer range with very low filler loading (usually 2-6% by weight). Due to the unique structure, specifically the high aspect ratio of these mineral fillers, the resultant high surface area provides similar reinforcing performance to that of traditional minerals and fibers used in polymers and yet does not increase density, since loading levels are low. Because of the nanometer size of the particles, which is smaller than the wavelength of visible light, the reinforced polymer remains transparent. Other characteristics of these composites include high barrier performance and improved thermal stability, which make these compounds suitable for many applications. This review aims to provide a brief current overview in exploring this new class of polymer composites.     

Highly stable persistent spectral hole burning in Eu ions doped oxy-fluoride glasses of 30CaF2–10Al2O3–60B2O3

High temperature persistent spectral hole burning up to room temperature has been observed in Eu³⁺ ions doped oxy-fluoride glasses with a composition of 30CaF₂–10Al₂O₃–60B₂O₃ (mol%) melted in a reducing atmosphere. The hole stability was studied through light-induced hole refilling and temperature cycling experiments. The burned holes survive thermal cycling to 300 K due to a high barrier height of 0.69 eV in the sample.     

Oxidation resistance of TaSiN diffusion barriers

Abstract

Due to his resistance to oxidation, TaSiN is a promising candidate as an electric conductive barrier layer for integration of ferroelectrics and high permittivity oxides in advanced memory devices. Here we report on the properties and the resistance to oxidation of TaSiN thin films deposited by reactive sputtering using a TaSi₂ target and then processed by rapid thermal annealing (RTA) in ¹⁸O₂ at 650°C. We use RBS (Rutherford Backscattering Spectroscopy) and NRA (Nuclear Reaction Analysis) to determine film compositions and XRD (X-Ray Diffraction) to study their microstructure. The concentration depth profiles of ¹⁸O was measured after the RTA treatments via the narrow resonances ¹⁸O(p,α)¹⁵N at 151 keV (fwhm=100eV). The relationship between the depth profiles and the excitation curves were deduced with the aid of the SPACES simulation program.     

航天器密封舱降压法抑制自然对流的数值研究

航天器密封舱地面试验中常利用降压法来抑制自然对流的影响,但是降压比的选择往往取决于一些未知参数,使得自然对流的抑制得不到保证.本文建立了某一载人航天器密封舱流动换热的稳态数值模型,通过对比研究地面试验与空间状态不同通风量下流动换热的变化情况,综合考虑人体舒适度、消除自然对流影响和能耗三方面,给出了密封舱最佳通风量.通过对比研究密封舱内不同气体压力条件下地面与空间条件的对流换热系数与温度分布情况,给出了可以忽略自然对流影响的临界压力及对应的Gr/Re2数.     

唐家山堰塞湖泄洪洞进口预留岩埂拆除爆破

针对唐家山堰塞湖泄洪洞进口预留岩埂爆区周边环境复杂、施工工期短等难题,介绍了预留岩埂拆除爆破方案、钻爆参数设计,爆破网路布置和安全防护措施.采用GPS RTK与数字测深仪相结合的水下地形测量技术和“先减高削薄预拆除,再关闭检修闸门往堰内充水平压后一次爆除”方案,较好的解决爆渣拥堵、飞石破坏等问题,确保岩埂拆除安全准爆.预拆除后岩埂拆除方量约1000 m3,平均炸药单耗1.34 kg/m3,最大单响药量按43.2 kg控制;清渣完毕后,基槽底部开挖高程达到设计高程705 m,爆破效果比较理想.     

Characterization of the high temperature oxidation of TBC-coated oxide-dispersed β-NiAl substrates

A Y₂O₃?stabilized ZrO₂ coating on three different oxide-dispersed (Y₂O₃, ZrO₂ and Al₂O₃) β-NiAl substrates was studied to evaluate the spallation behaviour of the coating and its effect on the oxidation behavior of these alloy substrates. Spallation of the coating during cyclic testing at 1200°C primarily occurred at the Al₂O₃ scale-substrate interface and was dependent on the adhesion of the scale to the substrate. Uncoated, Y₂O₃?dispersed β-NiAl had the best Al₂O₃ scale adhesion and the coated β-NiAl substrate had the longest coating lifetime. Al₂O₃?dispersed β-NiAl exhibited the poorest scale adhesion and the coating completely spalled after two 2-hour cycles. For this model-type system, the growth of voids at the metal-scale interface appears to be critical in determining scale adhesion and thus coating lifetime.     

苏通大桥基础工程的挑战与创新

介绍了苏通大桥超大深水群桩基础利用工程钢护筒搭设施工平台、５０００t承台钢吊箱整体同步沉放 及其与防船撞结构相结合构成永久防船撞设施、永久冲刷防护等三项技术创新;提出了特大型桥梁基础工程经 济合理的设计方案和安全可靠的施工法;阐明了理念创新和技术集成对大型复杂工程建设的重要性。