页岩气解吸规律新认识

自主研发的无压阻微压损型全自动含气量测试仪,不仅可以连续测试页岩气解吸气量,还具备检测甲烷质量分数的功能。依托于该仪器,对渝东南地区页岩气井进行现场含气量测试,首次实现对页岩气解吸中气体组分的连续检测,发现页岩气解吸具有独特规律。页岩气解吸遵循"三段式"变化模式,解吸初期(前3 h),甲烷质量分数快速增加,解吸中期(3～10 h)甲烷质量分数基本稳定不变,解吸后期(10 h至解吸终止)甲烷质量分数跳跃式下降至解吸结束。页岩气解吸是从外到内,从裂缝、大孔到微裂缝、微孔,最后到页岩基质块体,层层递进、逐级深入的过程。解吸初期,页岩释放的气体多来自裂缝或连通较好的大孔,游离气占据主要部分;解吸中期,微裂缝或大孔中呈吸附状态的气体及具一定连通性的中孔和部分微孔中气体开始释放,以游离气和吸附气为主;解吸后期,连通性较差及微孔中呈吸附或束缚状态的气体开始释放,吸附气占据主要部分。     

基于物联网的智慧医疗信息化应用探索

近年来,随着时代的不断发展,人们对各方面都有了更高的要求,而医疗作为关键的社会工作,必须随着时代的发展进行改革与优化。文中从物联网角度出发,着重分析了智慧医疗信息化发展过程中对物联网技术的应用,提出了八大关键技术,包括医疗设备互联互通和信息融合技术、医疗健康数据智能化分析技术、数据驱动的跨域业务流程集成技术、个性化的智能推荐服务技术、海量数据处理技术、个人隐私保护与信息安全技术、多并发与高性能计算技术、多模态信息融合技术,希望能推动智慧医疗的信息化与智能化发展。     

混合法Q吸收补偿

本文提出了一种在频率域和时间域混合实现高效、稳定的Q吸收补偿方法,适用于时、空变的层Q模型,对每一个常Q层,首先将地表波场延拓到当前层的顶部作为输入波场,并在频率域进行高效准确的相位补偿;再变换到时间域,通过零相位增益限制滤波器实现稳定的振幅补偿;最后输出当前层的结果并继续下一层的处理;层间波场延拓的稳定性也由增益限制所控制。合成数据和实际数据应用结果都证实了该方法的有效性和实用性。     

Narrowband performance of active control on flow-induced vibrations inside hard disk drives

This paper presents an experimental study of narrowband active control on the flow-induced vibrations (FIV) on the head gimbals assembly (HGA) in a working hard disk drive (HDD). Firstly, experiments with an analog feedback close-loop were conducted as demonstration for narrowband active control on principal peaks in the spectrum of the off-plate FIV on the HGA whose signal was collected with a 1-D laser Doppler vibrometer (LDV). Secondly, the modal testing on the experimental HDD was carried out to find out where the spectrum principal peaks focused in current active control come from. Thirdly, a digital feedback control close-loop was implemented in experiments for narrowband suppression on the focused FIV spectrum peaks on the HGA. In those close-loops, the off-plate HGA vibrations detected by the LDV were used as feedback error signals, then the signals was passed through an analog or digital controller to generate feedback signals to drive a piezoelectric disk to actuate feedback acoustic pressure around the HGA. Active control experiments were conducted in narrow bands on five principal peaks in the HGA off-plate vibration spectrum, around 1,256, 1,428, 2,141, 2,519 and 3,469 Hz, respectively. It is shown that distinct narrowband suppression of at least 10 dB can be achieved on all these HGA vibration peaks.     

NIR-IIb excitable bright polymer dots with deep-red emission for in vivo through-skull three-photon fluorescence bioimaging

Nano Research - It is of great significance to study the brain structure and function in deep-tissue for neuroscience research and bio-medical applications because of the urgent demand for precise...     

四川盆地东南部页岩气同位素分馏特征及对产能的指示意义

页岩气甲烷碳同位素是研究页岩气同位素分馏特征及产出过程的重要指标。选取四川盆地东南部及盆缘转换带内6大区块10口页岩气井上奥陶统五峰组-下志留统龙马溪组页岩,通过现场含气量测试过程中页岩气甲烷碳同位素变化,研究不同压力系统、不同小层下甲烷碳同位素分馏特征,探讨页岩气同位素与物性、含气性关系,并结合实际排采数据,对典型页岩气井产出阶段进行划分。页岩气解吸过程中,逐渐升高,甲烷碳同位素逐渐变重;超压页岩气甲烷碳同位素整体较小,从盆缘外部向内部,甲烷碳同位素逐渐变轻。纵向上,随着深度的增加,甲烷同位素整体变轻;页岩孔隙度越大、游离气含量越高、页岩保存条件越好,甲烷碳同位素分馏作用就越不明显。最后,选取武隆向斜L井岩心现场解吸气样,通过甲烷同位素分馏,对页岩气解吸阶段进行划分,并将排采气同位素与现场解吸气同位素进行比对。该井排采气的δ¹³C₁值对应现场岩心连续解吸0.9 h释放气体的δ¹³C₁值,其采收率约为24.8%,尚处于初期排采阶段。     

发挥集团优势 提高整体效益：安丘市玻璃钢工业发展模式探索

对山东省安丘市玻璃钢工业发展的战略及模式进行了总结回顾。     

Luminescence characteristics and energy transfer of Eu2+/Tb3+ doped single phase multi-color phosphor

The investigation on single phase multi-color phosphors is highly meaningful for near-ultraviolet chip based white light emitting diodes. In this work, a series of Eu²⁺ and Tb³⁺ singly doped and Eu²⁺/Tb³⁺ codoped Sr₅(PO₄)₃Cl phosphors were synthesized via a high-temperature solid state reaction method. The luminescence spectra and decay curves of Eu²⁺ and Tb³⁺ singly doped samples were discussed, the optimal doping concentrations were determined. Thanks to the spectra overlap between Eu²⁺ and Tb³⁺, nonradiative energy transfer from Eu²⁺ to Tb³⁺ was investigated. It is found electric dipole-dipole interaction played the main role for the energy transfer in codoped samples, the highest energy transfer efficiency was calculated to be 60.98%. Tunable emissions are observed for codoped samples by adjusting doping concentration. The thermal quenching properties were discussed and the activation energy (ΔE) was estimated in the present work.     

无患子皂素的表面活性及复配增效性能

无患子皂素是一种天然非离子型表面活性剂,30℃时其临界胶束浓度(cmc)值为0.1g/L,最低表面张力(g_cmc)为48.48mN/m,具有较好的表面活性。30～60℃之间,无患子皂素的g_cmc与cmc值基本保持不变;溶液偏酸性时,无患子皂素的最低表面张力下降幅度较大,cmc值不变;盐度对无患子皂素表面性能有一定的影响。此外,无患子皂素具有较好的抗硬水能力,且与其他合成表面活性剂复配有一定的增效作用,尤其是与十六烷基三甲基溴化铵形成的复配体系,其临界胶束浓度增效50.0%,并且降低表面张力的能力增效4.08%。无患子皂素起泡性强,泡沫稳定,国标GB/T 7162—1994条件下(溶液浓度C=2.5g/L)泡沫高度H₀为135.6mm,且复配体系的初始泡沫高度均有一定的增加。