大张坨储气库储层注采渗流特征研究

大张坨地下储气库是陕京输气管道的配套工程，保障天然气的调峰需要和供气安全，是由一个正在进行循环注气开发的凝析气藏改建而成的。为了保证地下储气库的长期使用寿命，需要研究在反复强注强采过程中气层的孔渗变化情况，为此开展了不同覆压条件下的孔隙度和渗透率反复测试实验和气水往复驱替实验。不同覆压孔渗测试实验结果证实,在储气库运行压力变化范围内孔隙度和渗透率变化幅度不大，而且这种变化基本上是可逆的。气水往复驱替实验结果证实，在气水两相反复驱替过程中气相有效渗透率呈下降的趋势，而且随着驱替次数的增加，两相共流区缩小，残余水下的气相渗透率和残余气下的水相渗透率都呈下降趋势。因此，只要将注采井选择在气藏构造的高部位，就能控制气水两相反复驱替造成的储层渗透率降低，这样不仅能够实现少井高产的目的，而且能够保证该储气库正常使用。这得到储气库运行实践的佐证。     

接触面陷阱密度对a-InSnZnO薄膜晶体管器件电气性能的影响研究

We reported the influence of interface trap density（Nt） on the electrical properties of amorphous InSnZnO based thin-film transistors,which were fabricated at different direct-current（DC） magnetron sputtering powers.The device with the smallest N_t of 5.68×10¹¹ cm^-2 and low resistivity of 1.21×10^-3Ω·cm exhibited a turn-on voltage(V_ON) of-3.60 V,a sub-threshold swing（S.S） of 0.16 V/dec and an on-off ratio(I_ON/I_OFF) of⁸ x 108.With increasing N_t,the V_ON,S.S and I_ON/I_OFF were suppressed to-9.40 V,0.24 V/dec and 2.59×10⁸,respectively.The V_TH shift under negative gate bias stress has also been estimated to investigate the electrical stability of the devices.The result showed that the reduction in N_t contributes to an improvement in the electrical properties and stability.     

Glyphosate Adsorption from Water Using Hierarchically Porous Metal–Organic Frameworks

The selective removal of one ligand in mixed-ligand MOFs upon thermolysis provides a powerful strategy to introduce additional mesopores without affecting the overall MOF structure. By varying the initial ligand ratio, MOFs of the MIL-125-Ti family with two distinct hierarchical pore architectures are synthesized, resembling either large cavities or branching fractures. The performance of the resulting hierarchically porous MOFs is evaluated toward the adsorptive removal of glyphosate (N-(phosphonomethyl)glycine) from water, and the adsorption kinetics and mechanism are examined. Due to their strong affinity for phosphoric groups, the numerous Ti–OH groups resulting from the selective ligand removal act as natural anchor points for effective glyphosate uptake. The relationships between contact duration, glyphosate concentration, and adsorbent dosage are investigated, and the impact of these parameters on the effectiveness of glyphosate removal from contaminated water samples is examined. The introduction of additional mesopores has increased the adsorption capacities by nearly 3 times with record values exceeding 440.9 mg g⁻¹, which ranks these MOFs among the best-reported adsorbents.     

Balancing MXene Surface Termination and Interlayer Spacing Enables Superior Microwave Absorption

Surface chemistry and interlayer engineering determines the electrical properties of 2D MXene. However, it remains challenging to regulate the surface and interfacial chemistry of MXene simultaneously. Herein, simultaneous modulation of Ti₃C₂T_x MXene surface termination and layer spacing by alkali treatment are achieved. The electrical and electromagnetic properties of Ti₃C₂T_x are investigated in detail with respect to KOH and ammonia concentration dependence. A high concentration of KOH caused the Ti₃C₂T_x layer spacing to expand to 13.7 Å and the surface O/F ratio to increase to 33.84. Because of its weaker ionization effect, ammonia provides finer tuning compared to the drastic intercalation of KOH with a thorough sweeping of the F-containing groups. Ti₃C₂T_x is enriched with conductive -OH termination after ammonia treatment, which achieves an effective balance with the increased interlayer resistance. Therefore, NH₃H₂O-Ti₃C₂T_x achieves broad-band impedance matching and exhibits an efficient microwave loss of −49.1 dB at a low thickness of 1.7 mm, with an effective frequency bandwidth of 3.9 GHz. The results herein optimize the electrical properties of Ti₃C₂T_x using surface and interfacial chemistry to achieve broad microwave absorption, providing a framework for enhancing the electromagnetic wave loss of intrinsic MXene.     

喷淋水幕抑制化工聚集区火灾效果研究

为了揭示不同工况下喷淋水幕对化工聚集区火灾抑制效果影响规律,建立了FDS数值模型,通过改变单一变量分别模拟水幕开合状态、不同水幕排数、不同水幕喷头高度下火灾发展过程,分析不同工况条件下火源温度变化规律和烟气蔓延规律。结果表明：喷淋水幕开启后,位于储罐上方及水幕帘后的测点温度峰值同比下降19%及36%,可有效抑制高温烟气层蔓延;双排水幕帘相比单排水幕帘在抑制火源温度及烟气蔓延更具成效;初始喷头高度5.8 m时,相比其他高度在降低温度、加速烟气沉降方面更具优势。     

运动序列的短期统计特性

本文利用动态图象序列研究了运动序列的短期统计特性,对每个宏块经过压缩后所产生的比特数进行了分析,研究了量化比例因子和量化加权矩阵对短期统计特性的影响.统计结果表明,量化比例因子对每个宏块比特数的概率分布影响最为明显,量化加权矩阵对分布特性的轮廓影响很小,当量化比较精细时图象内容对分布特性的低比特部分影响比较明显,而粗量化时它的影响较弱.     

8Mbit／s数字电视系统的设计与实现

介绍了８Ｍｂｉｔ／ｓ数字电视系统的系统构成，给出了图象压缩编解码，声音压缩编解码和数据通信接口的实现方案，对系统中所采用的新缓存控制策略也作了分析。     

8Mbps数字电视编解码器系统

本文出了８Ｍｂｐｓ数字电视编解码器的硬件实现方案，包括视频、音频信道三个部分，同时给出了样机的测试结果，最后略地介绍了此编解码器的应用情况。     

化学机械抛光工艺中的硅片背压力控制与优化

化学机械抛光（Chemical Mechanical Polishing,CMP）技术是最有效的晶圆全局平坦化技术,抛光头是CMP设备中最核心的部件之一,新一代抛光头的设计主要采用区域压力控制技术。硅片抛光质量不仅取决于抛光液,还取决于对硅片抛光压力的精确控制。在CMP抛光工艺过程中各腔室的压力设定值通常并非一致,而且由于柔性弹性隔膜的存在各腔室之间相互耦合。由于耦合现象的存在使得多区腔室压力控制变得复杂化,针对这一耦合现象本文提出了一种用于多区解耦的控制方法,并基于该方法对多腔室进行了系统辨识以及控制参数整定,最后进行了多腔室同时加压实验,实验结果表明该解耦控制方法的可行性以及正确性。