实芯焊丝拉拔过程中的热处理工艺介绍

叙述了低碳合金结构钢、不锈钢、镍基合金实芯焊丝拉拔过程中的热处理工艺选择;讨论了焊丝的热处理缺陷及防止措施。     

碳酸盐岩裂缝性地层气液重力置换实验

碳酸盐岩裂缝性地层在钻进过程中常出现由气液重力置换导致的溢漏同存现象,造成井下复杂、井控困难和储层伤害。笔者建立了气液重力置换室内实验装置,可模拟溢漏同存工况,具有裂缝尺寸、钻井液性能等关键参数可调、数据自动采集与分析、置换过程可视化等特点。基于该装置模拟了气液重力置换现象,可观察到裂缝中存在明显的气液分界面。通过改变裂缝宽度、裂缝钻开程度、钻井液黏度、井底压力等参数,研究了裂缝性地产气液重力置换特点。研究结果表明：漏失速率随裂缝缝宽和裂缝钻开程度的增加而增加,且对裂缝宽度更为敏感,而钻井液黏度增大对气液重力置换的抑制效果明显。基于室内实验结果,提出了气液重力置换的预防措施,可为碳酸盐岩裂缝性地层安全钻井施工提供参考。     

基于精简标准单元库的OPC复用技术

提出了一种对标准单元的光学邻近效应校正结果进行复用的方法,并通过将传统标准单元中的所有核心逻辑通过反相器和二选一多路选择器的组合来实现,得到了一套可制造性强的精简标准单元库,从而使OPC复用技术得以有效实施,并将在很大程度上提高芯片生产效率和降低掩模数据存储量.精简标准单元库中单元的电气仿真结果表明其在面积、速度、功耗方面与传统标准单元库相比性能损失很小.     

超深亚微米可制造标准单元库设计

当集成电路的特征尺寸下降到100nm以下,可制造性设计就变得尤为重要。本文提出了一种65nm可制造性标准单元库的设计方法。通过精简基本单元的数量,降低光学矫正的时间和空间复杂度;利用DFM设计规则和光学模拟仿真对每个单元的版图进行优化以提高整个单元库的可制造性。应用该方法实现的标准单元库在时序,功耗,面积方面与传统标准单元库相比具有很好的性能,并且通过Foundry的TD部门65nm工艺线的可制造性测试,有利于65nm工艺生产良率的提升。     

基于精简标准单元库的OPC复用技术

提出了一种对标准单元的光学邻近效应校正结果进行复用的方法,并通过将传统标准单元中的所有核心逻辑通过反相器和二选一多路选择器的组合来实现,得到了一套可制造性强的精简标准单元库,从而使OPC复用技术得以有效实施,并将在很大程度上提高芯片生产效率和降低掩模数据存储量.精简标准单元库中单元的电气仿真结果表明其在面积、速度、功耗方面与传统标准单元库相比性能损失很小.     

2D MoN1.2-rGO Stacked Heterostructures Enabled Water State Modification for Highly Efficient Interfacial Solar Evaporation

Improving interfacial solar evaporation performance is crucial for the practical application of this technology in solar-driven seawater desalination. Lowering evaporation enthalpy is one of the most promising and effective strategies to significantly improve solar evaporation rate. In this study, a new pathway to lower vaporization enthalpy by introducing heterogeneous interactions between hydrophilic hybrid materials and water molecules is developed. 2D MoN_1.2 nanosheets are synthesized and integrated with rGO nanosheets to form stacked MoN_1.2-rGO heterostructures with massive junction interfaces for interfacial solar evaporation. Molecular dynamics simulation confirms that atomic thick 2D MoN_1.2 and rGO in the MoN_1.2-rGO heterostructures simultaneously interact with water molecules, while the interactions are remarkably different. These heterogeneous interactions cause an imbalanced water state, which easily breaks the hydrogen bonds between water molecules, leading to dramatically lowered vaporization enthalpy and improved solar evaporation rate (2.6 kg m⁻² h⁻¹). This study provides a promising strategy for designing 2D-2D heterostructures to regulate evaporation enthalpy to improve solar evaporate rate for clean water production.     

基于重力矢量测量的惯性平台摇摆动态精度测试方法研究

为了准确高效地评估高精度惯性平台的摇摆动态精度,提出了一种基于重力矢量测量的惯性平台摇摆动态精度测试方法。惯性平台台体在摇摆过程中稳定在惯性空间,通过安装在平台台体上的3个正交方向的石英加速度计测量重力矢量,重力矢量在台体上的投影角直接反映平台台体的姿态变化,根据测量方法误差及石英加速度计输出特性进行姿态解算,并通过计算惯性平台动静漂移率之差得到惯性平台的摇摆动态精度。惯性平台的摇摆试验结果表明,基于重力矢量测量的惯性平台摇摆动态精度测试方法稳定性好、可信度高,并在误差控制方面明显优于传统的摇摆测试方法。     

Asphaltene Deposition During Steam-Assisted Gravity Drainage: Effect of Non-Condensable Gases

Asphaltene deposition was investigated during laboratory-scale steam-assisted gravity drainage (SAGD) experiments to probe in situ upgrading of a heavy oil. Tests were conducted with and without the addition of non-condensable gases (carbon dioxide or n-butane) to the steam. The apparatus was a three-dimensional scaled physical model packed with crushed limestone saturated with 12.4° API heavy-crude oil. Temperature, pressure, and production data, as well as the asphaltene content of the produced oil, were monitored continuously during the experiments. For small well separations, as the fraction of non-condensable gas in the steam increased, the steam condensation temperature and the steam-oil ratio decreased. As a result of lower temperature, the heavy oil was less mobile in the steam chamber relative to pure steam injection. Thus, the heating period was prolonged and the recovery, as well as the rate of oil recovery, decreased. Asphaltene content of the oil produced as a result of pure steam injection decreased initially showing deposition of asphaltene within the porous matrix of the model. As the steam injection continued, the asphaltene content of the produced oil increased but remained below the initial value. Thus, the produced oil indicated some in situ upgrading. As the carbon dioxide concentration in the steam increased, greater asphaltene deposition occurred; however, no significant change in asphaltene content was found when n-butane was added to the steam. Post-experimental analyses of the porous media for asphaltene content confirmed retention for the pure steam and steam with added CO₂ experiments. Numerical simulation of the asphaltene deposition process using a pure solid deposition model corroborated experimental findings and showed that deposition occurred mainly at the steam-chamber boundary.     

Graphene Oxide‐Template Controlled Cuboid‐Shaped High‐Capacity VS4 Nanoparticles as Anode for Sodium‐Ion Batteries

Room‐temperature sodium‐ion batteries have attracted great attentions for large‐scale energy storage applications in renewable energy. However, exploring suitable anode materials with high reversible capacity and cyclic stability is still a challenge. The VS₄, with parallel quasi‐1D chains structure of V⁴⁺(S₂^2?)₂, which provides large interchain distance of 5.83 Å and high capacity, has showed great potential for sodium storage. Here, the uniform cuboid‐shaped VS₄ nanoparticles are prepared as anode for sodium‐ion batteries by the controllable of graphene oxide (GO)‐template contents. It exhibits superb electrochemical performances of high‐specific charge capacity (≈580 mAh·g^?1 at 0.1 A·g^?1), long‐cycle‐life (≈98% retain at 0.5 A·g?¹ after 300 cycles), and high rates (up to 20 A·g^?1). In addition, electrolytes are optimized to understand the sodium storage mechanism. It is thus demonstrated that the findings have great potentials for the applications in high‐performance sodium‐ion batteries.