期刊文献+
共找到14,022篇文章
< 1 2 250 >
每页显示 20 50 100
Study on Mechanism for Alkylation of Benzene with Propylene over β Zeolite and MCM-22 Zeolite by In-situ IR Spectrometry
1
作者 Fu Jiquan Ding Chunhua 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2009年第3期48-55,共8页
The reaction mechanism for alkylation of benzene with propylene over the β zeolite and the MCM-22 zeolite were investigated respectively by in-situ IR spectrometry. Three types of experiments were carried out. (1) ... The reaction mechanism for alkylation of benzene with propylene over the β zeolite and the MCM-22 zeolite were investigated respectively by in-situ IR spectrometry. Three types of experiments were carried out. (1) IR spectra of the gas-phase propylene, benzene and isopropyl benzene were recorded. (2) IR spectra of the above-mentioned substances as adsorbates that have combined with the zeolite wafer were recorded. (3) IR spectra of the reaction modes were recorded. The test results showed that the alkytation reaction over the zeolite β was ascribed to the mechanism of carbonium ions, whereas the alkylation reaction over the zeolite MCM-22 was ascribed to the synchronous reaction mechanism. 展开更多
关键词 zeolite β zeolite MCM-22 ALKYLATION in-situ 1R spectrometry MECHANISM
下载PDF
In-situ IR Monitoring the Synthesis of Amphiphilic Copolymery P(HEMA-co-tBMA) via ARGET ATRP
2
作者 林文静 杨友强 +4 位作者 陈锐毫 文秀芳 钱宇 蔡成志 章莉娟 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第9期1046-1054,共9页
The amphiphilic copolymer poly(hydroxyethyl methacrylate-co-tert-butyl methacrylate) [P(HEMA-co-tBMA)] was synthesized by activators regenerated by electron transfer atom transfer radical polymerization (ARGET A... The amphiphilic copolymer poly(hydroxyethyl methacrylate-co-tert-butyl methacrylate) [P(HEMA-co-tBMA)] was synthesized by activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP), with the synthesis process monitored by in-situ infrared spectroscopy (IR). The molecular weight, chem- ical structure and characteristics of the copolymer were determined by 1H NMR, gas chromatography and gel permeation chromatography. The influences of various parameters on the living polymerization were explored. The molecular weight of the copolymer with narrow molecular weight distribution (Mw/Mn 〈 1.50) increases ap- proximately linearly with the monomer conversion, indicating a good control of polymerization. In the reaction temperature range from 50 ℃ to 90 ℃, the monomer conversion is higher at 60 ℃. The tBMA conversion rate decreases gradually with the increase of tBMA content, while the HEMA conversion is hardly affected by HEMA content. Weak polar solvent is more favorable to the polymerization compared to polar solvent. The molar ratio of reducing agent to catalyst has significant effect on the polymerization and increasing the amount of reducing agent will accelerate the reaction rate but causes wider molecular weight distribution. It is indicated that in-situ IR monitoring contributes to a more in-depth understanding of the mechanism of methacrylate monomer copolymerization. 展开更多
关键词 ln-sltu ir monitoringAmphiphilic copolymerARGET ATRPConversion rate
下载PDF
Studies on the Hydrogenation of Acetonitrile over Fresh Mo_2C/γ-Al_2O_3 Catalyst by In-situ IR Spectroscopy
3
作者 Zhang Jing Wu Weicheng +3 位作者 Liu Chuang Ding Xiaoguang Chu Gang Zhang Jianguo 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2015年第3期61-66,共6页
The adsorption of acetonitrile, the co-adsorption of acetonitrile with CO, and hydrogenation of acetonitrile on fresh Mo2C/γ-Al2O3 catalyst were studied by in situ IR spectroscopy. It was found out that CH3CN exhibit... The adsorption of acetonitrile, the co-adsorption of acetonitrile with CO, and hydrogenation of acetonitrile on fresh Mo2C/γ-Al2O3 catalyst were studied by in situ IR spectroscopy. It was found out that CH3CN exhibited strong interaction with the fresh Mo2C/γ-Al2O3 catalyst and was adsorbed mainly on Moδ+ sites of fresh Mo2C/γ-Al2O3 catalyst. Moreover, CH3CN could affect the shifting of IR spectra for CO adsorption towards a lower wave number. The IR spectroscopic study on acetonitrile hydrogenation showed that CH3CN could be easily hydrogenated in the presence of H2 on the Mo2C/γ-Al2O3 catalyst. Furthermore, it was observed that CH3 CN could be selectively hydrogenated to imines on fresh Mo2C/γ-Al2O3 catalyst. Additionally, the active sites of fresh Mo2C/γ-Al2O3 catalyst might be covered with coke during the hydrogenation reaction of acetonitrile. The treatment of catalyst with hydrogen at 673 K could not completely remove coke deposits on the surface of the Mo2C/γ-Al2O3 catalyst. 展开更多
关键词 fresh Mo2C/γ-Al2O3 catalyst HYDROGENATION ACETONITRILE in situ ir spectroscopy
下载PDF
In-situ AFM and quasi-in-situ studies for localized corrosion in Mg-9Al-1Fe-(Gd) alloys under 3.5 wt.% NaCl environment
4
作者 Junping Shen Tao Lai +7 位作者 Zheng Yin Yang Chen Kun Wang Hong Yan Honggun Song Ruiliang Liu Chao Luo Zhi Hu 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2024年第3期1170-1185,共16页
Revealing the localized corrosion process of Mg alloy is considered as one of the most significant ways for improving its corrosion resistance.The reliable monitor should be high distinguishability and real-time in li... Revealing the localized corrosion process of Mg alloy is considered as one of the most significant ways for improving its corrosion resistance.The reliable monitor should be high distinguishability and real-time in liquid environment.Herein,Mg-9Al-1Fe and Mg-9Al-1Fe-1Gd alloys were designed to highlight the impact of intermetallic on the corrosion behaviour.In-situ AFM with a special electrolyte circulation system and quasi-in-situ SEM observation were used to monitor the corrosion process of the designed alloys.SEM-EDS and TEM-SAED were applied to identify the intermetallic in the designed alloys,and their volta potentials were measured by SKPFM.According to the real-time and real-space in-situ AFM monitor,the corrosion process consisted of dissolution of anodicα-Mg phase,accumulation of corrosion products around cathodic phase and shedding of some fine cathodic phase.Then,the localized corrosion process of Mg alloy was revealed combined with the results of the monitor of corrosion process and Volta potential difference. 展开更多
关键词 Magnesium Localized corrosion in-situ AFM SKPFM Corrosion behaviour.
下载PDF
Numerical evaluations on the fluid production in the in-situ conversion of continental shale oil reservoirs
5
作者 Zhao-Bin Zhang Maryelin Josefina Briceno Montilla +3 位作者 Shou-Ding Li Xiao Li Jian-Peng Xing Yan-Zhi Hu 《Petroleum Science》 SCIE EI CAS CSCD 2024年第4期2485-2501,共17页
In-situ conversion presents a promising technique for exploiting continental oil shale formations,characterized by highly fractured organic-rich rock.A 3D in-situ conversion model,which incorporates a discrete fractur... In-situ conversion presents a promising technique for exploiting continental oil shale formations,characterized by highly fractured organic-rich rock.A 3D in-situ conversion model,which incorporates a discrete fracture network,is developed using a self-developed thermal-flow-chemical(TFC)simulator.Analysis of the model elucidates the in-situ conversion process in three stages and defines the transformation of fluids into three distinct outcomes according to their end stages.The findings indicate that kerogen decomposition increases fluid pressure,activating fractures and subsequently enhancing permeability.A comprehensive analysis of activated fracture permeability and heating power reveals four distinct production modes,highlighting that increasing heating power correlates with higher cumulative fluid production.Activated fractures,with heightened permeability,facilitate the mobility of heavy oil toward production wells but hinder its cracking,thereby limiting light hydrocarbon production.Additionally,energy efficiency research demonstrates the feasibility of the in-situ conversion in terms of energy utilization,especially when considering the surplus energy from high-fluctuation energy sources such as wind and solar power to provide heating. 展开更多
关键词 in-situ conversion Continental shale oil Natural fracture network TFC model
下载PDF
基于IRS-1/PI3K信号轴探究补肺健脾方对COPD大鼠骨骼肌线粒体损伤的影响 被引量:2
6
作者 沈婷婷 李素云 +4 位作者 李亚 轩银霜 李景梅 李高峰 韩冰洋 《中国比较医学杂志》 CAS 北大核心 2024年第3期57-67,共11页
目的探究补肺健脾方(Bufei Jianpi formula,BJF)通过调控IRS-1/PI3K信号轴对COPD大鼠骨骼肌线粒体损伤的影响。方法将60只SPF级SD大鼠随机分为空白(Control)组、COPD稳定期模型(Model)组、氨茶碱(Am)组、补肺健脾方(BJF)组、吡格列酮(P... 目的探究补肺健脾方(Bufei Jianpi formula,BJF)通过调控IRS-1/PI3K信号轴对COPD大鼠骨骼肌线粒体损伤的影响。方法将60只SPF级SD大鼠随机分为空白(Control)组、COPD稳定期模型(Model)组、氨茶碱(Am)组、补肺健脾方(BJF)组、吡格列酮(PIO)组以及补肺健脾方+吡格列酮(BJF+PIO)组,10只/组。采用烟熏加鼻腔滴菌(肺炎克雷伯杆菌)的方法建立COPD稳定期大鼠模型,自第9周开始给药至20周结束后取材,每周给予大鼠体重测量。分别对肺组织和骨骼肌组织进行常规切片与HE染色,并于光镜下观察其相应的病理学改变。分别于第0、8、20周采用非束缚全身体积描记系统观察大鼠肺功能,包括VT、PEF、EF50。采用qPCR技术检测大鼠骨骼肌组织中IRS-1、PI3K、PGC-1α以及Leptin mRNA的表达。采用Western blot技术检测大鼠骨骼肌组织中IRS-1、PI3K、AKT、p-AKT、PGC-1α、TFAM和Leptin蛋白的表达。结果光镜观察显示与Control组比,Model组肺病理可见肺泡间质以及肺支气管存有大量的炎性细胞浸润,部分肺泡壁出现断裂并融合形成气腔、纤维网被破坏等;与Model组比,用药治疗后各组肺泡壁的断裂以及纤维网的破坏均得到改善,支气管中炎性细胞浸润减轻,其中以BJF组与Am组尤为明显。用药治疗后各组骨骼肌病理与Model组比,可不同程度改善肌纤维之间排列间隙、萎缩与断裂,肌细胞胞质染色不均一等,其中以BJF组疗效较为显著。与Control组比,Model组PEF、VT和EF50第8周起显著降低(P<0.01),BJF组、BJF+PIO组和Am组可以显著提高PEF、EF50(P<0.01)。与Control组比,Model组中IRS-1、PGC-1α和PI3K mRNA与蛋白表达水平显著降低(P<0.05,P<0.01),Leptin mRNA与蛋白表达水平显著增高(P<0.01);与Model组比,BJF组IRS-1、PGC-1α、PI3K mRNA与蛋白表达水平显著增高(P<0.05,P<0.01);PIO组IRS-1 mRNA表达水平显著增高(P<0.01);BJF+PIO组PGC-1αmRNA水平显著增高(P<0.01),IRS-1、PI3K mRNA与蛋白水平显著升高(P<0.05,P<0.01);Am组中PI3K mRNA与蛋白表达水平显著增高(P<0.01);4个用药组中Leptin mRNA的表达水平均显著降低(P<0.01),除Am组外,其余3个用药组Leptin蛋白表达显著降低(P<0.01);与Control组比,Model组股四头肌组织中TFAM、p-AKT蛋白表达有明显的下降趋势,各治疗组的TFAM、p-AKT蛋白表达均有升高趋势,但无显著性差异(P>0.05)。结论补肺健脾方可通过调控IRS-1/PI3K信号轴,改善骨骼肌线粒体的损伤,同时提高PGC-1α与线粒体转录因子TFAM的表达,增强线粒体的生物合成,从而减轻肺与骨骼肌组织的病理性损伤。 展开更多
关键词 COPD 骨骼肌功能障碍 irS-1/PI3K信号通路 补肺健脾方
下载PDF
Fe、Ir掺杂MoS_(2)表面对N_(2)气敏吸附与解离反应性能提升的第一性原理研究
7
作者 肖香珍 胡林峰 张建伟 《原子与分子物理学报》 CAS 北大核心 2025年第1期13-19,共7页
基于第一性原理方法,采用周期性平板模型,研究了N_(2)分子在掺杂体系TM-MoS_(2)(TM=Fe、Ir)表面的吸附和解离行为.研究表明:N_(2)分子在TM-MoS_(2)(TM=Fe、Ir)表面吸附能依次为0.62和0.47 eV,而完整MoS_(2)表面的吸附能只有0.08 eV,说... 基于第一性原理方法,采用周期性平板模型,研究了N_(2)分子在掺杂体系TM-MoS_(2)(TM=Fe、Ir)表面的吸附和解离行为.研究表明:N_(2)分子在TM-MoS_(2)(TM=Fe、Ir)表面吸附能依次为0.62和0.47 eV,而完整MoS_(2)表面的吸附能只有0.08 eV,说明掺杂之后对N_(2)表现出略好的吸附性能.差分电荷密度分析表明,N_(2)吸附后,掺杂Fe、Ir原子与两个N原子之间电荷有所增加,N-N键之间的区域电荷密度减少,N-N键的强度减弱.态密度计算结果发现,N_(2)在吸附过程中,主要是N原子的2p_(y)、2p_(z)轨道与Ir的5d_(xy)和5d_(z^(2))以及Fe的3d_(xy)和3d_(z^(2))发生杂化作用.通过分析解离活化能,N_(2)在掺杂体系TM-MoS_(2)(TM=Fe、Ir)表面解离需要活化能均较高,且远大于在相应掺杂表面的吸附能,说明N_(2)在掺杂体系TM-MoS_(2)(TM=Fe、Ir)表面解离应该表现为分子吸附或脱附. 展开更多
关键词 Fe、ir 掺杂 单层MoS_(2) N_(2) 吸附与解离 活化能 密度泛函理论
下载PDF
硬件损伤条件下无人机辅助的NOMA-IRS网络资源分配算法
8
作者 樊自甫 夏子航 +1 位作者 王正强 万晓榆 《重庆理工大学学报(自然科学)》 CAS 北大核心 2024年第3期275-285,共11页
探讨了在硬件损伤条件下,如何通过搭载在无人机上的智能反射面(IRS)有效支持基于非正交多址接入(NOMA)技术的网络,以加快多用户数据的传输速率。提出了一种全面优化策略实现整个通信系统的最大传输速率,包括联合调整串行干扰消除的解码... 探讨了在硬件损伤条件下,如何通过搭载在无人机上的智能反射面(IRS)有效支持基于非正交多址接入(NOMA)技术的网络,以加快多用户数据的传输速率。提出了一种全面优化策略实现整个通信系统的最大传输速率,包括联合调整串行干扰消除的解码策略、IRS的反射配置、无人机的空间位置以及基站的发射功率。由于该问题是一个非凸问题,提出使用块坐标下降方法来实现优化的一种迭代算法,将原始的非凸问题细分为3个子问题,并通过结合惩罚函数法、半正定松弛技术和连续凸近似法来解决这些子问题。仿真结果表明:提出的算法在系统总速率方面相比随机部署无人机、未使用IRS辅助的NOMA策略,系统速率有显著提升。 展开更多
关键词 非正交多址接入 智能反射面 凸优化 和速率最大化 无人机
下载PDF
基于平行因子分解的IRS辅助毫米波信道估计
9
作者 杨青青 李学文 +1 位作者 彭艺 王健明 《中山大学学报(自然科学版)(中英文)》 CAS CSCD 北大核心 2024年第4期124-131,共8页
提出了一种基于平行因子分解的信道估计算法。首先,根据毫米波信道固有的稀疏特性对信道进行建模,利用块衰落信道的特点将信号矩阵构建成一个3维张量,并且利用平行因子分解算法对张量进行分解。然后利用压缩感知理论将分解后的矩阵转化... 提出了一种基于平行因子分解的信道估计算法。首先,根据毫米波信道固有的稀疏特性对信道进行建模,利用块衰落信道的特点将信号矩阵构建成一个3维张量,并且利用平行因子分解算法对张量进行分解。然后利用压缩感知理论将分解后的矩阵转化为稀疏信号的恢复问题。最后,利用改进的双线性交替最小二乘算法对信道进行求解。仿真结果表明,与现有的BALS算法、wBALS算法和LSKRF算法相比,本文算法估计精度较高。 展开更多
关键词 可重构智能表面 毫米波通信 信道估计 张量 平行因子分解
下载PDF
IRS辅助的车联网相移设计和信道对齐策略
10
作者 王汝言 王康 +2 位作者 崔亚平 何鹏 吴大鹏 《系统工程与电子技术》 EI CSCD 北大核心 2024年第2期761-769,共9页
针对车联网中车辆的动态移动以及信号的随机散射所导致的信道快速变化问题,研究了智能反射面(intelligent reflecting surface,IRS)辅助的车联网通信并提出了联合相移设计和信道对齐策略,以削减车联网中多普勒频移的影响并提升通信性能... 针对车联网中车辆的动态移动以及信号的随机散射所导致的信道快速变化问题,研究了智能反射面(intelligent reflecting surface,IRS)辅助的车联网通信并提出了联合相移设计和信道对齐策略,以削减车联网中多普勒频移的影响并提升通信性能。提出的策略由两个阶段构成。在第一阶段设计IRS的相移以改善级联信道的衰落状态,在策略的第二阶段进行修正函数的设计,实现了直接信道和级联信道的信道对齐,从而减少直接信道快衰落状态对通信性能的影响。通过联合相移设计和信道对齐策略中设计的反射相移以及修正函数,实现了通信性能的提升。仿真结果表明,所提策略相比于相移优化策略可以提升8.8%的频谱效率。 展开更多
关键词 车联网 智能反射面 衰落信道 相移设计
下载PDF
IRS辅助的异构SWIPT-NOMA系统资源分配方案
11
作者 季薇 刘子卿 《通信学报》 EI CSCD 北大核心 2024年第4期39-53,共15页
考虑到未来大型物联网中待服务用户的异构性(接收机产自不同制造商,且具有不同结构、不同功能)和服务需求的多样性,针对功率分割(PS)用户和时间切换(TS)用户共存的异构场景,提出一种IRS辅助的无线携能通信(SWIPT)非正交多址接入(NOMA)... 考虑到未来大型物联网中待服务用户的异构性(接收机产自不同制造商,且具有不同结构、不同功能)和服务需求的多样性,针对功率分割(PS)用户和时间切换(TS)用户共存的异构场景,提出一种IRS辅助的无线携能通信(SWIPT)非正交多址接入(NOMA)通信系统模型。在满足两类用户服务质量的条件下,通过联合优化基站的有源波束成形、IRS的无源相移矩阵、PS用户的功率分割系数、TS用户时间切换系数以及两类用户的串行干扰消除解码顺序来最小化基站的发射功率。为解决该非凸问题,采用基于连续凸逼近的交替迭代方法将问题拆分成多个子问题。针对IRS相移的无源波束成形优化子问题,采用连续秩一约束松弛方法求解。仿真结果表明,IRS辅助的通信系统基站发射功率明显低于无IRS方案;IRS辅助的NOMA通信系统基站发射功率低于IRS辅助的正交多址接入通信系统;IRS辅助的PS-SWIPT系统基站发射功率低于IRS辅助的TS-SWIPT系统。 展开更多
关键词 智能发射面 无线携能通信 非正交多址接入 资源分配
下载PDF
城市街道下场景IRS辅助D2D通信系统波束成形设计
12
作者 张祖凡 刘建 张晨璐 《电子与信息学报》 EI CAS CSCD 北大核心 2024年第9期3571-3582,共12页
针对城市街道场景下蜂窝用户和D2D通信用户共享频谱以及城市街道下无线信道特性,该文提出一种IRS辅助的联合波束成形设计方法。在D2D链路信号与干扰加噪声比的约束下,以最大化蜂窝用户容量为目标,设计了最优的波束形成向量、相移矩阵和... 针对城市街道场景下蜂窝用户和D2D通信用户共享频谱以及城市街道下无线信道特性,该文提出一种IRS辅助的联合波束成形设计方法。在D2D链路信号与干扰加噪声比的约束下,以最大化蜂窝用户容量为目标,设计了最优的波束形成向量、相移矩阵和D2D链路发射功率。引入松弛变量将非凸且变量耦合的优化问题转换为解耦后的凸优化问题和二分法搜索功率分配,采用黎曼共轭梯度算法对反射相移矩阵进行优化。仿真结果表明,所提算法收敛性较好,且与基准方案相比能有效地提升用户信道容量。 展开更多
关键词 智能反射面 D2D 波束成形 交替优化
下载PDF
利用元学习算法的IRS-OTFS通信系统信道估计
13
作者 张祖凡 段佳慧 王国仲 《电子与信息学报》 EI CAS CSCD 北大核心 2024年第4期1353-1362,共10页
针对高多普勒场景下智能反射表面(IRS)辅助多用户通信系统存在的信道估计传输开销大的问题,该文结合正交时频空间(OTFS)调制特点构造一种IRS-OTFS通信系统,充分发挥IRS和OTFS的性能优势,并在此基础上提出一种学习率自适应的模型无关元学... 针对高多普勒场景下智能反射表面(IRS)辅助多用户通信系统存在的信道估计传输开销大的问题,该文结合正交时频空间(OTFS)调制特点构造一种IRS-OTFS通信系统,充分发挥IRS和OTFS的性能优势,并在此基础上提出一种学习率自适应的模型无关元学习(MAML)算法。对IRS-OTFS多用户信道估计任务做离线训练,根据各任务的收敛速度自适应地调整学习率,防止训练失衡,并利用信道之间的相关性和MAML算法的少样本、泛化特性得到全局模型和适应性模型,快速学习新用户信道的传输特性,降低传输开销,提高信道估计准确性。理论分析和仿真结果表明,该算法在信道传输条件相同的情况下,将传输开销降低了大约50%,并相对于基准算法有4.8 dB左右的性能提升。 展开更多
关键词 智能反射表面 元学习 正交时频空间 信道估计
下载PDF
IRS辅助去蜂窝mMIMO系统低复杂度波束赋形算法
14
作者 鲜永菊 于东方 +1 位作者 邢智童 梁吉申 《陆军工程大学学报》 2024年第3期9-15,共7页
针对目前智能反射面(intelligent reflecting surface,IRS)辅助去蜂窝大规模多输入多输出(massive multiple-input multiple-output,mMIMO)系统现有算法复杂度高的问题,提出了一种基于IRS辅助去蜂窝mMIMO系统联合波束赋形低复杂度算法... 针对目前智能反射面(intelligent reflecting surface,IRS)辅助去蜂窝大规模多输入多输出(massive multiple-input multiple-output,mMIMO)系统现有算法复杂度高的问题,提出了一种基于IRS辅助去蜂窝mMIMO系统联合波束赋形低复杂度算法。在满足还原用户接收的信号、IRS相移和发射功率约束的条件下,以得到最优发射波束赋形向量为目标,构建了一个联合优化接入点(access point,AP)主动波束赋形和IRS被动波束赋形问题。利用交替优化方法将原问题转换为两个易于处理的子问题,并基于解非齐次线性方程组,采用Lagrange乘数法和人工蜂群算法对子问题进行求解。仿真结果表明,相较于传统算法,所提算法有更低的复杂度和误码率,可使用更小的发射功率和频谱效率等资源获得与其他方案相当的性能。 展开更多
关键词 智能反射面 多输入多输出系统 波束赋形
下载PDF
Numerical analysis on mechanical difference of sandstone under in-situ stress,pore pressure preserved environment at depth 被引量:1
15
作者 Hongwei Zhou Mingyuan Lu +5 位作者 Heping Xie Wenhao Jia Ruidong Peng Yimeng Wang Bocen Chen Pengfei Jing 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2023年第11期1339-1350,共12页
Deep in-situ rock mechanics considers the influence of the in-situ environment on mechanical properties,differentiating it from traditional rock mechanics.To investigate the effect of in-situ stress,pore pressure pres... Deep in-situ rock mechanics considers the influence of the in-situ environment on mechanical properties,differentiating it from traditional rock mechanics.To investigate the effect of in-situ stress,pore pressure preserved environment on the mechanical difference of sandstone,four tests are numerically modeled by COMSOL:conventional triaxial test,conventional pore pressure test,in-situ stress restoration and reconstruction test,and in-situ pore pressure-preserved test(not yet realized in the laboratory).The in-situ stress restoration parameter is introduced to characterize the recovery effect of in-situ stress on elastic modulus and heterogeneous distribution of sandstone at different depths.A random function and nonuniform pore pressure coefficient are employed to describe the non-uniform distribution of pore pressure in the in-situ environment.Numerical results are compared with existing experimental data to validate the models and calibrate the numerical parameters.By extracting mechanical parameters from numerical cores,the stress-strain curves of the four tests under different depths,in-situ stress and pore pressure are compared.The influence of non-uniform pore pressure coefficient and depth on the peak strength of sandstone is analyzed.The results show a strong linear relationship between the in-situ stress restoration parameter and depth,effectively characterizing the enhanced effect of stress restoration and reconstruction methods on the elastic modulus of conventional cores at different depths.The in-situ pore pressurepreserved test exhibits lower peak stress and peak strain compared to the other three tests,and sandstone subjected to non-uniform pore pressure is more prone to plastic damage and failure.Moreover,the influence of non-uniform pore pressure on peak strength gradually diminished with increasing depth. 展开更多
关键词 in-situ pore pressure-preserved ENVirONMENT Numerical simulation approach Deep in-situ rock mechanics in-situ stress restoration and reconstruction
下载PDF
Mechanism and reservoir simulation study of the autothermic pyrolysis in-situ conversion process for oil shale recovery 被引量:2
16
作者 Wei Guo Qiang Li +2 位作者 Sun-Hua Deng Yuan Wang Chao-Fan Zhu 《Petroleum Science》 SCIE EI CAS CSCD 2023年第2期1053-1067,共15页
The autothermic pyrolysis in-situ conversion process (ATS) consumes latent heat of residual organic matter after kerogen pyrolysis by oxidation reaction, and it has the advantages of low development cost and exploitat... The autothermic pyrolysis in-situ conversion process (ATS) consumes latent heat of residual organic matter after kerogen pyrolysis by oxidation reaction, and it has the advantages of low development cost and exploitation of deep oil shale resources. However, the heating mechanism and the characteristic of different reaction zones are still unclear. In this study, an ATS numerical simulation model was proposed for the development of oil shale, which considers the pyrolysis of kerogen, high-temperature oxidation, and low-temperature oxidation. Based on the above model, the mechanism of the ATS was analyzed and the effects of preheating temperature, O_(2) content, and injection rate on recovery factor and energy efficiency were studied. The results showed that the ATS in the formation can be divided into five characteristic zones by evolution of the oil and O_(2) distribution, and the solid organic matter, including residue zone, autothermic zone, pyrolysis zone, preheating zone, and original zone. Energy efficiency was much higher for the ATS than for the high-temperature nitrogen injection in-situ conversion process (HNICP). There is a threshold value of the preheating temperature, the oil content, and the injection rate during the ATS, which is 400 °C, 0.18, and 1100 m3/day, respectively, in this study. 展开更多
关键词 Oil shale Autothermic pyrolysis in-situ conversion process Energy efficiency
下载PDF
甘油三酯血糖指数及HOMA-IR与慢性乙型肝炎患者肝纤维严重程度的相关性分析
17
作者 李占霞 《罕少疾病杂志》 2024年第10期60-62,共3页
目的在慢性乙型肝炎(CHB)患者中分析并比较甘油三酯血糖(TyG)指数及HOMA-IR与肝纤维化严重程度的相关性。方法选取我院感染科2018年1月至2021年12月收治及门诊就诊的600例CHB患者为研究对象,根据实时剪切波弹性成像检查的肝脏硬度值(LSM... 目的在慢性乙型肝炎(CHB)患者中分析并比较甘油三酯血糖(TyG)指数及HOMA-IR与肝纤维化严重程度的相关性。方法选取我院感染科2018年1月至2021年12月收治及门诊就诊的600例CHB患者为研究对象,根据实时剪切波弹性成像检查的肝脏硬度值(LSM)分为S0S1组(n=184)、S2组(n=145)、S2S3组(n=128)和≥S3组(n=143)。测定所有入选者的空腹血糖、空腹胰岛素、甘油三酯等,计算TyG指数和HOMA-IR。结果与S0S1组相比,S2组、S2S3组和≥S3组TyG指数和HOMA-IR均升高,差别均有统计学意义(P<0.05),并且随着肝纤维化严重程度的增加,TyG指数和HOMA-IR逐渐升高;Pearson相关分析提示,在CHB患者中,LSM与TyG指数(r=0.289,P<0.001)和HOMA-IR(r=0.283,P<0.001)均呈正相关;多元Logistic回归分析提示,TyG指数和HOMA-IR均是肝纤维化严重程度的独立危险因素;ROC曲线分析提示TyG指数对CHB患者发生肝纤维化的预测效能大于HOMA-IR,当TyG指数大于5.33时,其预测肝纤维化发生的敏感度为79.8%,特异度为63.6%。结论TyG指数与CHB患者肝纤维化严重程度密切相关,其对CHB患者发生肝纤维化的预测价值优于HOMA-IR。 展开更多
关键词 甘油三酯血糖指数 HOMA-ir 肝纤纤维化 慢性乙型肝炎
下载PDF
In-situ magnetic field enhanced performances in ferromagnetic FeCo_(2)O_(4) nanofibers-based rechargeable Zinc-air batteries 被引量:1
18
作者 Zhengmei Zhang Lei Jia +4 位作者 Tong Li Jinmei Qian Xiaolei Liang Desheng Xue Daqiang Gao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2023年第3期447-453,I0013,共8页
Field-assisted electrocatalytic reactions are demonstrated to be sufficient strategies in enhancing the electrocatalyst activities for oxygen evolution reaction(OER).Here,we report the in-situ magnetic field enhanced ... Field-assisted electrocatalytic reactions are demonstrated to be sufficient strategies in enhancing the electrocatalyst activities for oxygen evolution reaction(OER).Here,we report the in-situ magnetic field enhanced electrocatalytic activity in ferromagnetic FeCo_(2)O_(4)nanofibers.Our results demonstrate that the overpotential of FeCo_(2)O_(4)nanofibers at 10 mA cm^(-2)shows a left-shift of 40 mV for the OER by applying an external magnetic field,and no obvious change has been observed in the non-ferromagnetic-order Co3O4nanofibers.Calculation results indicate that there are more overlaps between the density of states for Co3d and O 2p by applying an external magnetic field.Accordingly,the spin hybridization of 3d-2p and the kinetics of spin charge transfer are optimized in ferromagnetic FeCo_(2)O_(4),which can promote the adsorption of oxygen-intermediates and electron transfer,significantly improving its electrocatalytic efficiency.What’s more,the maximum power density of the FeCo_(2)O_(4)nanofibers based Zn-air battery(ZAB)increases from 97.3 mW cm^(-2)to 108.2 mW cm^(-2)by applying an external magnetic field,providing a new idea for the application of magnetic cathode electrocatalysts in ZABs. 展开更多
关键词 in-situ magneticfield Oxygen evolution reaction Spin hybridization Zn-air battery
下载PDF
高性能Ir基阳极双催化层阴离子交换膜电解水
19
作者 尹燕 尹硕尧 +2 位作者 陈斌 冯英杰 张俊锋 《材料导报》 EI CAS CSCD 北大核心 2024年第6期1-7,共7页
设计高性能低Ir阳极催化层对阴离子交换膜电解水(AEMWE)商业化发展至关重要。本研究采用催化剂涂覆基底(CCS)方法,构建基于氧化铱(IrO_(2))和碳载铱(IrC)双催化层的阳极结构,提出了一种新型双Ir催化层并提高了AEMWE性能。研究表明,在IrC... 设计高性能低Ir阳极催化层对阴离子交换膜电解水(AEMWE)商业化发展至关重要。本研究采用催化剂涂覆基底(CCS)方法,构建基于氧化铱(IrO_(2))和碳载铱(IrC)双催化层的阳极结构,提出了一种新型双Ir催化层并提高了AEMWE性能。研究表明,在IrC-IrO_(2)(先喷涂碳载铱,后喷涂氧化铱)催化层中,IrC高度分散特性有利于提高催化层中Ir的利用率,优化了催化层内电子、氢氧根离子的传输。采用商业Pt/C催化剂作为阴极,IrC-IrO_(2)阳极双催化层组装成碱性膜电极,在1 mol/L KOH电解质条件下,2.0 V时IrC-IrO_(2)电极达到了2.31 A/cm^(2)的高电流密度,而且在低浓度电解质以及纯水中依旧保持较高的性能。本研究为碱性膜电解水技术高效催化层的设计提供了参考。 展开更多
关键词 阴离子交换膜电解水(AEMWE) 析氧反应(OER) 双催化层 ir基催化剂
下载PDF
Restoration of reservoir diagenesis and hydrocarbon accumulation process by calcite in-situ U-Pb dating and fluid inclusion analysis: A case study on Cretaceous Qingshuihe Formation in Gaoquan Structure, southern Junggar Basin, NW China 被引量:1
20
作者 GUI Lili ZHUO Qingong +7 位作者 LU Xuesong YANG Wenxia CHEN Weiyan WU Hai FAN Junjia HE Yinjun CAO Rizhou YU Xiaoqing 《Petroleum Exploration and Development》 SCIE 2023年第6期1386-1397,共12页
The complexity of diagenesis and hydrocarbon accumulation in the deep reservoirs in southern Junggar Basin restricts hydrocarbon exploration in the lower reservoir assemblage. The lithofacies and diagenesis of reservo... The complexity of diagenesis and hydrocarbon accumulation in the deep reservoirs in southern Junggar Basin restricts hydrocarbon exploration in the lower reservoir assemblage. The lithofacies and diagenesis of reservoirs in the Cretaceous Qingshuihe Formation in the Gaoquan structure of the Sikeshu Sag, southern Junggar Basin were analyzed. On this basis, the thermal history was calibrated using calcite in-situ U-Pb dating and fluid inclusion analysis to depict the hydrocarbon accumulation process in the Gaoquan structure. The results show that the Qingshuihe reservoir experienced two phases of calcite cementation and three phases of hydrocarbon charging. The calcite cements are dated to be (122.1±6.4) Ma, (14.4±1.0) Ma - (14.2±0.3) Ma. The hydrocarbon charging events occurred at around 14.2-30.0 Ma (low-mature oil), 14.2 Ma (mature oil), and 2 Ma (high-mature gas). The latter two phases of hydrocarbon charging contributed dominantly to the formation of reservoir. Due to the S-N compressive thrust activity during the late Himalayan period since 2 Ma, the traps in the Gaoquan structure were reshaped, especially the effective traps which developed in the main reservoir-forming period were decreased significantly in scale, resulting in weak hydrocarbon shows in the middle-lower part of the structure. This indicates that the effective traps in key reservoir-forming period controlled hydrocarbon enrichment and distribution in the lower reservoir assemblage. Calcite U-Pb dating combined with fluid inclusion analysis can help effectively describe the complex diagenesis and hydrocarbon accumulation process in the central-west part of the basin. 展开更多
关键词 fluid inclusion calcite in-situ U-Pb dating diagenetic sequence hydrocarbon accumulation timing Sikeshu Sag southern Junggar Basin CRETACEOUS Qingshuihe Formation
下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部