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Copyright of Special Oil & Gas Reservoirs is the property of Special Oil & Gas Reservoirs Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Special Oil & Gas Reservoirs is the property of Special Oil & Gas Reservoirs Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

目的　探讨超声引导下胸椎旁神经阻滞对老年肝癌手术患者镇痛效果和认知功能的影响。方法　选择 择期行肝癌切除手术的老年患者134例，随机分为观察组和对照组，每组67例。对照组予自控静脉镇痛（托烷司琼 5 mg + 舒芬太尼 0. 2 µg/kg用生理盐水稀释至 100 mL），观察组在此基础上予超声引导下胸椎旁神经阻滞（0. 25% 罗哌卡因0. 5 mg/kg）。比较两组术后1、4、12、24、72 h镇痛效果［采用视觉模拟评分法（VAS）评估］及血清疼痛介质 ［神经肽 Y（NPY）、P 物质（SP）及多巴胺（DA）］水平，术前 1 天与术后 7 天认知功能［采用简易智能精神检查量表 （MMSE）评分评估］及血清认知功能相关指标［脑源性神经营养因子（BDNF）、兴奋性氨基酸（EAA）、缺氧诱导因子 1α（HIF-1α）］水平，以及围手术期不良反应情况。结果　两组术后VAS和血清NPY、SP、DA水平均呈先上升后下降 趋势，并且观察组术后4、12、24、72 h VAS和血清NPY、SP、DA水平均低于对照组同期（P均<0. 05）。观察组与对照 组术后MMSE评分均低于术前，并且观察组术后MMSE评分高于对照组术后（P均<0. 05）。两组术后血清BDNF水 平均低于术前，血清EAA、HIF-1α水平均高于术前（P均<0. 05）；观察组术后血清BDNF水平高于对照组术后，血清 EAA、HIF-1α水平均低于对照组术后（P均<0. 05）。观察组围手术期不良反应发生率低于对照组（P<0. 05）。结论　老年 肝癌手术患者在自控静脉镇痛基础上予超声引导下胸椎旁神经阻滞不仅镇痛效果好，还能减轻术后认知功能损伤， 并且安全性较高。 [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Objective Based on the technical principle that rapid replenishment of formation energy can improve the degree of CO2 miscibility, the feasibility of the injection method to improve the degree of CO2 immiscible flooding in low-pressure tight sandstone reservoirs in Ordos Basin was studied. Methods In this paper, the effects of CO2 displacement at various injection rates and volumes were compared under reservoir conditions. The changes of formation pressure, oil change rate, recovery degree, gas-oil ratio and extraction parameters also were investigated. Results Compared with the conventional injection rate and volumes, the formation pressure increased by 4.14 MPa, the oil change rate increased by 0.13, the recovery degree increased by 22%, the gas-oil ratio decreased by 50%, the component content of C4—C12 increased significantly, and the content of recombination component decreased significantly. Field tests of the two well groups showed that the monthly oil production of the well group was increased by 78%, the average formation pressure was 5 MPa, the corresponding well oil pressure was increased by 4.5 MPa, the degree of miscibility was increased by 32.81%, and the oil displacement effect was remarkable. Conclusion The injection method can effectively improve the degree of CO2 miscible flooding and the effect of CO2 immiscible flooding in tight sandstone reservoirs. [ABSTRACT FROM AUTHOR]

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Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The integrated navigation system (INS), vital in aerospace and ocean exploration, faces challenges in reliability analysis due to its complex operational environment. Addressing this, the finite degradation structures (FDS) method was employed for a thorough examination of the multi-state integrated navigation system. Initial steps involve transforming component fault modes into a state space using the failure mode and effect analysis ( FMEA) method. Subsequently, an abstraction operation establishes the relationship between component states and system states, forming the required FDS model. This model serves as the basis for critical scenario analysis and calculation of reliability indicators. Through this systematic approach, the occurrence probability of various system states can be computed and the sensitivity of individual component states can be assessed. The identifications of the weak points and the degradation boundaries of the system are well demonstrated with illustrative case studies. These results can be seen as insights to guide reliability decisions, including the development of system maintenance strategies and risk prevention schemes. [ABSTRACT FROM AUTHOR]

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