检索结果-内蒙古大学图书馆

中国医学影像技术 2022年第5期38卷 739-742页

作者：张慈慈梁治平刘琼冯友珍钟敏之曾旭文暨南大学附属广州红十字会医院放射科广东广州510220 暨南大学附属第一医院影像中心广东广州510632

目的以T1ρ和T2 mapping成像观察青少年尺、桡骨远端骺板表现,分析其可行性。方法前瞻性纳入20名健康青少年志愿者,采集双侧腕关节T1ρ和T2 mapping,观察尺、桡骨远端骺板形态,测量尺骨远端骺板内、外侧区和桡骨远端骺板内侧区、中间区... 详细信息

目的以T1ρ和T2 mapping成像观察青少年尺、桡骨远端骺板表现,分析其可行性。方法前瞻性纳入20名健康青少年志愿者,采集双侧腕关节T1ρ和T2 mapping,观察尺、桡骨远端骺板形态,测量尺骨远端骺板内、外侧区和桡骨远端骺板内侧区、中间区及外侧区T1ρ和T2值;比较不同侧别、性别间尺、桡骨远端骺板总体及不同区域的T1ρ和T2值差异,分析尺、桡骨和远端骺板T1ρ及T2值与年龄的相关性。结果尺、桡骨远端骺板于T1ρ和T2 mapping原始图中均呈板状高信号。不同侧别、性别之间,尺、桡骨远端骺板总体及不同区域T1ρ和T2值差异均无统计学意义(P均>0.05)。桡骨远端骺板T1ρ值与年龄呈正相关(r=0.596,P=0.006),其余参数均与年龄无明显相关性(P均>0.05)。结论T1ρ及T2 mapping成像可直观显示青少年尺、桡骨远端骺板形态,定量观察骺板生化改变,可行性好。

关键词：尺骨桡骨生长板磁共振成像 T1ρ T2 mapping 前瞻性研究

来源：评论

学校读者我要写书评

暂无评论

MRI观察青少年专业跳水运动员腕关节损伤类型

引用

中国医学影像技术 2021年第5期37卷 745-748页

作者：张慈慈段丽霞熊玉超陈松刘琼曾旭文广州市红十字会医院放射科广东广州510220

目的采用MRI观察青少年专业跳水运动员腕关节运动相关损伤类型。方法以42例腕关节疼痛运动员患者共84个腕关节作为运动组,与15名年龄相匹配志愿者(对照组)相对比,观察其MRI表现,判断腕关节损伤类型。结果运动组84个腕关节中,19.05%(16/... 详细信息

目的采用MRI观察青少年专业跳水运动员腕关节运动相关损伤类型。方法以42例腕关节疼痛运动员患者共84个腕关节作为运动组,与15名年龄相匹配志愿者(对照组)相对比,观察其MRI表现,判断腕关节损伤类型。结果运动组84个腕关节中,19.05%(16/84)尺骨远端骺板损伤,42.86%(36/84)桡骨远端骺板损伤;40.48%(34/84)手舟骨软骨下骨质硬化,64.29%(54/84)月骨软骨下骨质硬化,61.90%(52/84)桡骨远端软骨下骨质硬化;14.29%(12/84)出现骨髓水肿;25.00%(21/84)出现腱鞘或滑膜囊肿;11.90%(10/84)三角纤维软骨复合体损伤;4.76%(4/84)出现尺骨阳性变异。对照组腕关节未见明显异常改变。结论青少年专业跳水运动员腕关节损伤主要表现为骺板损伤、软骨下骨质硬化及骨髓水肿。

关键词：腕关节创伤和损伤运动员磁共振成像

来源：评论

学校读者我要写书评

暂无评论

^(18)F-FDG PET/MRI对恶性肿瘤淋巴结转移的诊断价值:Meta分析

引用

国际医学放射学杂志 2022年第4期45卷 414-419页

作者：张慈慈段丽霞刘雅慧欧志强叶郭锡曾旭文广州市红十字会医院放射科广州510220

目的系统评价^(18)F-FDG PET/MRI对恶性肿瘤淋巴结转移的诊断价值。方法检索PubMed、EMbase、Cochrane Library、中国知网、万方数据、维普数据库从2010年1月—2020年5月公开发表的关于^(18)F-FDG PET/MRI诊断恶性肿瘤淋巴结转移的中英... 详细信息

目的系统评价^(18)F-FDG PET/MRI对恶性肿瘤淋巴结转移的诊断价值。方法检索PubMed、EMbase、Cochrane Library、中国知网、万方数据、维普数据库从2010年1月—2020年5月公开发表的关于^(18)F-FDG PET/MRI诊断恶性肿瘤淋巴结转移的中英文文献,根据纳入、排除标准筛选并提取数据,采用诊断准确性研究质量评价工具-2(QUADAS-2)评价纳入文献质量,应用Meta-Disc 1.4软件进行分析。采用不一致指数(I2)和Cochran-Q检验进行异质性分析,并计算合并敏感度、特异度、阳性似然比、阴性似然比及相应95%CI,绘制汇总受试者操作特征(SROC)曲线并计算曲线下面积(AUC)。采用阈值效应和亚组分析探讨异质性的来源。亚组分析根据研究类型、原发肿瘤类型、是否合并有增强MRI进行分组分析。结果共纳入25篇文献,包括1347例肿瘤病人,^(18)F-FDG PET/MRI诊断恶性肿瘤淋巴结转移的合并敏感度、特异度、阳性似然比、阴性似然比、AUC值分别为0.85(95%CI:0.81~0.88)、0.92(95%CI:0.90~0.93)、6.63(95%CI:4.50~9.79)、0.22(95%CI:0.16~0.29)、0.92。亚组分析结果显示,前瞻性研究中的^(18)F-FDG PET/MRI对恶性肿瘤淋巴结转移的诊断效能高于回顾性研究,AUC值分别为0.92、0.88;无增强MRI的研究诊断效能高于有增强MRI的研究,AUC值分别为0.93、0.91;^(18)F-FDG PET/MRI对胃肠癌淋巴结转移的诊断效能最高,其次为宫颈癌、肺癌、乳腺癌,AUC值分别为0.96、0.95、0.93、0.90。结论^(18)F-FDG PET/MRI对恶性肿瘤淋巴结转移具有较高的诊断价值。

关键词：恶性肿瘤淋巴结转移正电子发射计算机体层成像磁共振成像 Meta分析

来源：评论

学校读者我要写书评

暂无评论

基于影像学特征对骨质疏松性椎体压缩骨折病人经皮椎体成形术后同椎体再发骨折的预测研究

引用

国际医学放射学杂志 2022年第4期45卷 407-413页

作者：吴丽梁治平熊玉超何洁贾妩懿吴迪朗曾旭文陈松广州市红十字会医院放射科广州510220

目的探讨基于影像学特征对骨质疏松性椎体压缩骨折(OVCF)病人经皮椎体成形术(PVP)后的列线图模型预测术椎椎体再发骨折的价值。方法回顾性纳入急性OVCF并行PVP后的病人93例。所有病人均行X线及MRI检查,根据椎体再发骨折诊断标准将病人... 详细信息

目的探讨基于影像学特征对骨质疏松性椎体压缩骨折(OVCF)病人经皮椎体成形术(PVP)后的列线图模型预测术椎椎体再发骨折的价值。方法回顾性纳入急性OVCF并行PVP后的病人93例。所有病人均行X线及MRI检查,根据椎体再发骨折诊断标准将病人分为再发骨折组(48例)和无再发骨折组(45例)。采用t检验和卡方检验比较2组间临床资料及影像特征的差异,对差异有统计学意义的指标进行多因素Logistic回归分析,获取再发骨折的独立危险因素,采用R软件建立列线图模型并绘制其校准曲线。采用受试者操作特征(ROC)曲线评估模型的预测效能,计算ROC曲线下面积(AUC)。应用校准曲线对列线图模型进行验证。结果再发骨折组的椎体高度恢复率、延伸至终板的骨折线、椎体内裂隙(IVC)、骨水泥周围积液及骨水泥-终板未接触(NPEC)与无再发骨折组的差异均有统计学意义(均P<0.05);多因素Logistic回归分析显示延伸至终板的骨折线[优势比(OR)=3.232]、存在IVC(OR=27.117)和NPEC(OR=1.993)及较高的椎体高度恢复率(OR=2.943)为同椎体再发骨折的独立危险因素(均P<0.05)。存在延伸至终板的骨折线的椎体骨质前份前移距离[(3.12±2.62)mm]大于无延伸者[(1.67±2.18)mm](P<0.05)。与不存在IVC病人相比,存在IVC病人的椎体高度恢复率(分别为7.19%±8.60%和12.63%±11.81%)和NPEC发生率[78.38%(58/74)和94.74%(18/19)]均更高(P<0.05)。列线图模型预测再发骨折的AUC为0.860,敏感度0.792,特异度0.844。校准曲线显示列线图预测概率与实际概率一致性尚可。结论基于影像学特征建立的列线图模型能够预测术椎椎体再发骨折。

关键词：骨质疏松性椎体压缩骨折经皮椎体成形术再发骨折列线图磁共振成像数字X线摄影

来源：评论

学校读者我要写书评

暂无评论

Highly Robust,Compressible,Anisotropic,and Fire-Retardant Polyimide/Hydroxyapatite Nanowires/Reduced Graphene Oxide Aerogel for Rapid Adsorption of Viscous Oil Assisted by Sunlight

引用

Research 2024年第4期7卷 58-70页

作者： Pan Huang Yongxiang Sun Lin Yang Haoyu Yang Ying Hu Jifang Liu xuwen Peng Hongbo zeng Department of Chemical and Materials Engineering University of AlbertaEdmontonAlberta T6G 1H9Canada Heavy Machinery Engineering Research Center of Education Ministry Taiyuan University of Science and TechnologyTaiyuan 030024China Cancer Center The Fifth Affiliated HospitalGuangzhou Medical UniversityGuangzhou 510700China Department of Chemical Engineering Tsinghua UniversityBeijing 10084China

Improving the adsorption efficiency of porous adsorbent materials for organic liquids with high viscosity is crucial for addressing oil spill *** this study,a high-performance aerogel adsorbent composed of polyimide(PI),hydroxyapatite nanowires(HAPnws),and reduced graphene oxide(rGO)has been fabricated,which leverages reduced flow tortuosity through anisotropic structures and solar-assisted viscosity reduction via photothermal *** prepared anisotropic PI/HAP/rGO aerogel,with directional channels,shows unique mechanical properties with high stiffness along the axial direction and compressibility along the radial direction.

关键词： nanowires viscosity adsorbent

来源：评论

学校读者我要写书评

暂无评论

Efficient Production of Melanin by Aureobasidium Melanogenum Using a Simplified Medium and pH-Controlled Fermentation Strategy with the Cell Morphology Analysis

引用

APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY 2024年第2期196卷 1122-1141页

作者： Zhou, Ran Ma, Lan Qin, xuwen Zhu, Hui Chen, Guiguang Liang, Zhiqun zeng, Wei Guilin Med Univ Key Lab Biochem & Mol Biol Educ Dept Guangxi Zhuang Autonomous Reg 1 Zhiyuan Rd Guilin 541199 Guangxi Peoples R China Guilin Med Univ Sch Intelligent Med & Biotechnol 1 Zhiyuan Rd Guilin 541199 Guangxi Peoples R China Guangxi Univ Coll Life Sci & Technol Guangxi Microorganism & Enzyme Res Ctr Engn Techno State Key Lab Conservat & Utilizat Subtrop Agrobio 100 Daxue Rd Nanning 530004 Guangxi Peoples R China

Natural melanin is a biopolymer with wide application prospects in medicine, food, cosmetics, environmental protection, agriculture, and so on. Microbial fermentation is an important and effective way to produce melanin. In this study, Aureobasidium melanogenum, known as black yeast with cellular pleomorphism, was used for the production of melanin. Based on the characteristic of A. melanogenum secreting melanin under oligotrophic stress, a simple medium containing only glucose, MgSO4 center dot 7H(2)O, and KCl was constructed for the production of melanin. The melanin titer of 6.64 +/- 0.22 g/L was obtained after 20 days of fermentation without pH control. The cell morphological changes of A. melanogenum during the production of melanin were recorded, and the results showed that chlamydospore might be the most favorable cell morphology for melanin synthesis. Then, different fermentation strategies with cell morphology analysis were developed to further improve the production of melanin in a 5-L fermenter. Results showed that the maximum titer of melanin reached 18.50 g/L by using the fermentation strategy integrating pH control, ammonium salt addition, and H2O2 stimulation, which increased by 178.6% than that of the strategy without pH control. Furthermore, the melanin obtained from the fermentation broth was characterized as eumelanin containing an indole structure. This study provided a potentially feasible fermentation strategy for the industrial production of melanin.

关键词： Melanin Aureobasidium melanogenum Simplified medium pH-controlled strategy Cell morphology Characterization

来源：评论

学校读者我要写书评

暂无评论

Assessing the impact of marketization on energy poverty

引用

ENVIRONMENT DEVELOPMENT AND SUSTAINABILITY 2025年第4期27卷 9257-9286页

作者： Shi, Xinjie zeng, Pei Cui, Liu Gao, xuwen Qiu, Tongwei Jiang, Qiang Fu, Linlin China Acad Rural Dev Zhejiang Univ Sch Publ Affairs Hangzhou Peoples R China Zhejiang Univ Res Ctr Common Prosper Innovat Ctr Yangtze River Delta Future Reg Dev Lab Jiaxing Peoples R China Zhejiang Univ & Huzhou City Ctr Common Prosper Huzhou Peoples R China Zhejiang Univ Inst Common Prosper & Dev Hangzhou Peoples R China Nanjing Agr Univ Coll Econ & Management Nanjing Peoples R China Guangxi Univ Sci & Technol Sch Econ & Management Liuzhou Peoples R China Zhejiang Acad Agr Sci Inst Rural Dev Hangzhou Peoples R China

In conjunction with economic growth, improving the quality of life for its citizens is a central concern for the Chinese government. Energy poverty, a topic closely linked to people's quality of life, has garnered global attention. This study examines the relationship between marketization and energy poverty by constructing provincial-level panel data using the fixed effect model. To address endogeneity, the instrumental variable method is further employed. The study obtains two major findings. First, the study reveals a significant upward trend in marketization in China in recent years, with a concomitant decrease in energy poverty. Here, the causal (and negative) effects of marketization on energy poverty are identified. Second, the mechanism analysis shows that this effect operates through (i) improvements in the quantity of energy supply (rather than energy supply efficiency), (ii) the accumulation of human capital that promotes the use of clean energy, and (iii) an increase in people's income. This study makes three key contributions. First, it empirically analyzes the impact of marketization on energy poverty from a macro-perspective. Second, it systematically discusses the pathways through which marketization operates. Third, drawing on several theories, it provides a deeper understanding of the theoretical connection between marketization and energy poverty.

关键词： Energy poverty Marketization Instrumental variable China

来源：评论

学校读者我要写书评

暂无评论

Mid-Miocene (17-11 Ma) fast exhumation in the upper Jinsha River and its implication for regional faulting in Southeast Tibet

引用

GEOMORPHOLOGY 2024年 466卷

作者： Shen, xuwen Jing, Liu-zeng Shen, Xiaoming zeng, Xianyang Wang, Zijun Xing, Yukun Wang, Heng Li, Mohan Tianjin Univ Sch Earth Syst Sci Tianjin 300072 Peoples R China Minist Emergency Management China Natl Inst Nat Hazards Beijing 100085 Peoples R China China Earthquake Adm Inst Geol State Key Lab Earthquake Dynam Beijing 100029 Peoples R China Univ Melbourne Sch Geog Earth & Atmospher Sci Parkville Vic 3010 Australia

The rugged southeast (SE) Tibet hosts a network of evolving faults, many of which are poorly understood due to a lack of sedimentary records and poor accessibility. The Jinsha River fault zone (JRFZ) is vaguely considered as a major fault bounding the Chuan-Dian Block in the northwest, yet little is known about its tectonic evolution history, which hinders our clear understanding of the tectonic deformation pattern, process and geomorphic response of SE Tibet. Here, we collected 10 samples from the hanging wall of the Xiongsong reverse fault, one strand of the JRFZ, near Markam area and on the trunk of the upper Jinsha River, to reveal its exhumation and kinematic history through low-temperature thermochronology. The ZHe ages (similar to 17-13 Ma) of the samples from the hanging wall are much younger than the published ones in the footwall, but the AFT (similar to 11-9 Ma) and AHe ages (similar to 14-6 Ma) are only slightly younger than those in the footwall. The QTQt and 3-D thermo-kinematic Pecube modeling suggest consistently that the Xiongsong fault experienced strong activity during the mid-Miocene (similar to 17-11 Ma) and then weakened. Post-11 Ma decreases in exhumation here on the trunk of the Jinsha river, if interpreted as river incision, is opposite to previously inferred river response to late Miocene surface uplift driven by the lower crust flow. Significant differences in thermochronological data and modeling results on both sides of the Jinsha River indicate the importance of local faulting in the development of large rivers. In addition, late Miocene fault activity shifts have also been observed on other major structures in SE Tibet, such as the left-lateral faulting of the Xianshuihe-Xiaojiang fault, the enhanced thrusting of the Longmen Shan-Yalong thrust belt and the kinematic reversal of the Ailao Shan-Red River shear zone. We infer that the near synchronized change in regional fault activity may be caused by the clockwise rotation of SE Tibet,

关键词： Southeastern Tibet Chuan-Dian Block Jinsha River fault zone Low-temperature thermochronology Late Miocene

来源：评论

学校读者我要写书评

暂无评论

Probing and Manipulating Noncovalent Interactions in Functional Polymeric Systems

引用

CHEMICAL REVIEWS 2022年第18期122卷 14594-14678页

作者： Chen, Jingsi Peng, Qiongyao Peng, xuwen Zhang, Hao zeng, Hongbo Univ Alberta Dept Chem & Mat Engn Edmonton AB T6G 1H9 Canada

Noncovalent interactions, which usually feature tunable strength, reversibility, and environmental adaptability, have been recognized as driving forces in a variety of biological and chemical processes, contributing to the recognition between molecules, the formation of molecule clusters, and the establishment of complex structures of macromolecules. The marriage of noncovalent interactions and conventional covalent polymers offers the systems novel mechanical, physicochemical, and biological properties, which are highly dependent on the binding mechanisms of the noncovalent interactions that can be illuminated via quantification. This review systematically discusses the nano mechanical characterization of typical noncovalent interactions in polymeric systems, mainly through direct force measurements at microscopic, nanoscopic, and molecular levels, which provide quantitative information (e.g., ranges, strengths, and dynamics) on the binding behaviors. The fundamental understandings of intermolecular and interfacial interactions are then correlated to the macroscopic performances of a series of noncovalently bonded polymers, whose functions (e.g., stimuli-responsiveness, self-healing capacity, universal adhesiveness) can be customized through the manipulation of the noncovalent interactions, providing insights into the rational design of advanced materials with applications in biomedical, energy, environmental, and other engineering fields.

关键词： Ligands Molecular mechanics Noncovalent interactions Polymers Surface interactions

来源：评论

学校读者我要写书评

暂无评论

A Novel and High-Efficiency Approach to Improve the Sustainability of Agitation Leaching Technology to Refractory Copper Oxide Ore Using the Self-Pressurizing Technology

引用

JOURNAL OF SUSTAINABLE METALLURGY 2025年 1-17页

作者： Wang, Jian zeng, Xin Liu, xuwen Xu, Wenlong Pan, Yue Li, Jinhui Wang, Ruixiang Xiao, Yanfei Xu, Zhifeng Jiangxi Prov Key Lab Green & Low Carbon Met Strate Ganzhou 341000 Peoples R China Jiangxi Univ Sci & Technol Sch Met Engn 86 Hongqi Ave Ganzhou 341000 Peoples R China Ganzhou Engn Technol Res Ctr Green Met & Proc Inte Ganzhou 341000 Peoples R China Nanchang Univ Sch Phys & Mat Sci Nanchang 330031 Peoples R China Tibet Yulong Copper Co Ltd 22 West City Rd Chengdu 854000 Peoples R China Jiangxi Coll Appl Technol 9 Wenfeng Rd Ganzhou 341000 Peoples R China Minist Nat Resources Key Lab Ion Rare Earth Resources & Environm Ganzhou 341000 Peoples R China

Considering economics and environmental protection, the agitation leaching technology using sulfuric acid is considered a preferred alternative to recover copper oxide ores in the copper industry. However, this process is still extremely difficult to extract copper from some complex polymetallic and refractory oxide ores, such as copper oxide ores with high alkalinity gangues (HAG) and high binding rates (HBR), respectively. In this paper, a novel and high-efficiency extraction process involving agitation leaching with self-pressurizing technology at low temperatures is proposed to improve copper extraction of the refractory HAG and HBR copper oxide ores from Tibet. Under the self-pressurizing agitation leaching process, the effects of leaching parameters are investigated on copper extraction and other elements dissolution including aluminum, arsenic, and iron, respectively. The results show that the self-pressurizing leaching technology of complex copper oxide ores has some advantages, including relatively simple to apply, environmentally friendly, energy-saving, and high efficiency, especially the higher copper extraction (more than 98.0%) over the conventional agitation leaching process in the sulfuric acid media. Under optimum experimental conditions of mass ratio of copper oxide ores of 5:5, agitation speed of 400 rpm, initial sulfuric acid concentration of 4.0 mol/L, and leaching time of 60 min at 80 degrees C, the copper extraction reached 98.9%, while the maximum average pressure reached 1.31 MPa in the closed reaction vessel. The self-pressurizing leaching technology can significantly improve the adaptability of the conventional agitation leaching technology to the refractory copper oxide ore without adding the other reagent.

关键词： Self-driven pressurization Agitation leaching Copper oxide ores Low temperature

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：