期刊文献+
共找到14,021篇文章
< 1 2 250 >
每页显示 20 50 100
Revolution CT联合不同权重ASIR-V在胸痛三联征成像中的应用价值比较 被引量:1
1
作者 郑晓娜 周方丽 刘雅兰 《中国CT和MRI杂志》 2024年第4期55-58,共4页
目的探讨Revolution CT联合不同权重多模型迭代重建技术(ASIR-V)在胸痛三联征(TRO)成像中的应用价值。方法选取我院2022年8月~2023年3月收治的90例胸痛患者进行研究,入院后接受TRORevolution CT平扫。按随机数字表法分成滤波反投影(FBP... 目的探讨Revolution CT联合不同权重多模型迭代重建技术(ASIR-V)在胸痛三联征(TRO)成像中的应用价值。方法选取我院2022年8月~2023年3月收治的90例胸痛患者进行研究,入院后接受TRORevolution CT平扫。按随机数字表法分成滤波反投影(FBP)组与ASIR-V组各45例。FBP组采用FBP技术进行图像重组,ASIR-V组采用不同权重(10%、30%、50%、70%、90%)前置ASIR-V技术重组。记录两组辐射剂量长度乘积(DLP)、有效剂量(ED),比较不同重组方式及不同权重下冠状动脉、升主动脉、降主动脉、肺动脉干的平均CT值、噪声值、信噪比(SNR)、对比信噪比(CNR),由2名经验丰富的影像科医生进行主观图像质量评分。结果ASIR-V组DLP、ED低于FBP组(P<0.05)。ASIR-V不同权重的血管腔噪声值低于FBP,血管腔SNR、CNR与主观图像质量评分高于FBP(P<0.05)。ASIR-V权重50%、70%、90%的噪声值低于ASIR-V权重10%、30%的噪声值(P<0.05)。ASIR-V权重50%、70%、90%的SNR、CNR高于ASIR-V权重10%、30%的SNR、CNR(P<0.05)。ASIR-V权重50%、70%的主观评分高于ASIR-V权重10%、30%、90%的主观评分(P<0.05)。结论Revolution CT联合ASIR-V技术能减少辐射剂量,ASIR-V权重50%、70%时对血管腔与解剖结构的显示良好,血管腔噪声值较低,SNR、CNR较高,能满足诊断需求。 展开更多
关键词 胸痛三联征 权重 多模型迭代重建技术 revolution CT
下载PDF
Artificial selection of the Green Revolution gene Semidwarf 1 is implicated in upland rice breeding
2
作者 Shuliang Jiao Qinyan Li +6 位作者 Fan Zhang Yonghong Tao Yingzhen Yu Fan Yao Qingmao Li Fengyi Hu Liyu Huang 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2024年第3期769-780,共12页
Semidwarf breeding has boosted crop production and is a well-known outcome from the first Green Revolution. The Green Revolution gene Semidwarf 1(SD1), which modulates gibberellic acid(GA) biosynthesis, plays a princi... Semidwarf breeding has boosted crop production and is a well-known outcome from the first Green Revolution. The Green Revolution gene Semidwarf 1(SD1), which modulates gibberellic acid(GA) biosynthesis, plays a principal role in determining rice plant height. Mutations in SD1 reduce rice plant height and promote lodging resistance and fertilizer tolerance to increase grain production. The plant height mediated by SD1 also favors grain yield under certain conditions. However, it is not yet known whether the function of SD1 in upland rice promotes adaptation and grain production. In this study, the plant height and grain yield of irrigated and upland rice were comparatively analyzed under paddy and dryland conditions. In response to dryland environments, rice requires a reduction in plant height to cope with water deficits. Upland rice accessions had greater plant heights than their irrigated counterparts under both paddy and dryland conditions, and appropriately reducing plant height could improve adaptability to dryland environments and maintain high grain yield formation. Moreover, upland rice cultivars with thicker stem diameters had stronger lodging resistance, which addresses the lodging problem. Knockout of SD1 in the upland rice cultivar IRAT104 reduced the plant height and grain yield, demonstrating that the adjustment of plant height mediated by SD1 could increase grain production in dryland fields. In addition, an SD1 genetic diversity analysis verified that haplotype variation causes phenotypic variation in plant height. During the breeding history of rice, SD1 allelic mutations were selected from landraces to improve the grain yield of irrigated rice cultivars, and this selection was accompanied by a reduction in plant height. Thus, five known mutant alleles were analyzed to verify that functional SD1 is required for upland rice production. All these results suggest that SD1 might have undergone artificial positive selection in upland rice, which provides further insights concerning greater plant height in upland rice breeding. 展开更多
关键词 Green revolution Semidwarf 1 high-yield breeding upland rice plant height
下载PDF
The Revolution that Reshapes Lifestyles
3
作者 MAZHAR ALAM 《China Today》 2024年第8期56-57,共2页
While navigating the brave new world of online shopping,China should strike a balance between embracing the future and preserving the traditions that enrich its cultural fabric.IN the bustling streets of China,a quiet... While navigating the brave new world of online shopping,China should strike a balance between embracing the future and preserving the traditions that enrich its cultural fabric.IN the bustling streets of China,a quiet revolution has taken place,reshaping the way people shop and interact with the market.E-commerce has emerged as a dominant force,offering a plethora of products and services at the fingertips of tens of millions.From the tiny needle to the grandest household appliances,from branded shoes to fresh fruits and vegetables,everything is just a click away. 展开更多
关键词 SHOPPING offering revolution
下载PDF
World’s Energy Transition and Chinese-style Modern Energy Revolution under Carbon Neutrality (Ⅱ)
4
作者 Zou Caineng Xiong Bo +6 位作者 Li Shixiang Ma Feng Pan Songqi Liu Hanlin Zhang Guosheng Zhao Qun Guan Chunxiao 《China Oil & Gas》 CAS 2024年第2期11-19,共9页
Chinese-style modernization emphasizes the harmonious coexistence of man and nature and actively yet prudently promotes carbon peak and carbon neutrality.It delves deeply into the energy revolution,upholding the follo... Chinese-style modernization emphasizes the harmonious coexistence of man and nature and actively yet prudently promotes carbon peak and carbon neutrality.It delves deeply into the energy revolution,upholding the following principles:the“independence”of energy production,the“green”energy supply,the“security”of energy reserves,the“efficiency”of energy consumption,the“intelligence”of energy management,and the“economy”of energy costs.Efforts are being made to accelerate the planning and construction of a new type of energy system that is green and smart,with new energy,new electricity,new stored energy,and new smart energy as the mainstays,to ensure energy security.Currently,China is an energy power but not an energy superpower,and its energy consumption structure still needs further optimization.China’s new energy security strategy is composed of energy consumption revolution,energy supply revolution,energy technology revolution,and energy system revolution,complemented by comprehensive strengthening of international cooperation.This approach is aimed at advancing China’s energy revolution and transforming the nation’s energy supply pattern and shifting from a consumption mix in 2022. 展开更多
关键词 TRANSITION revolution SHIFTING
下载PDF
World Industrial Revolutions and the Development of Artificial Intelligence System
5
作者 Khatira Guliyeva 《Chinese Business Review》 2024年第1期47-51,共5页
The objective-scientific conclusions obtained from the researches conducted in various fields of science prove that era and worldview are in unity and are phenomena that determine one another,and era and worldview are... The objective-scientific conclusions obtained from the researches conducted in various fields of science prove that era and worldview are in unity and are phenomena that determine one another,and era and worldview are the most important phenomena in the understanding of geniuses,historical events,including personalities who have left a mark on the history of politics,and every individual as a whole.And it is appropriate to briefly consider the problem in the context of human and personality factors.It is known that man has tried to understand natural phenomena since the beginning of time.Contact with the material world naturally affects his consciousness and even his subconscious as he solves problems that are important or useful for human life.During this understanding,the worldview changes and is formed.Thus,depending on the material and moral development of all spheres of life,the content and essence of the progress events,as the civilizations replaced each other in different periods,the event of periodization took place and became a system.If we take Europe,the people of the Ice Age of 300,000 years ago,who engaged in hunting to solve their hunger needs,in other words,the age of dinosaurs,have spread to many parts of the world from Africa,where they lived in order to survive and meet more of their daily needs.The extensive integration of agricultural Ice Age People into the Earth included farming,fishing,animal husbandry,hunting,as well as handicrafts,etc.,and has led to the revolutionary development of the fields.As economic activities led these first inhabitants of the planet from caves to less comfortable shelters,then to good houses,then to palaces,labor activities in various occupations,including crafts,developed rapidly.Thus,the fads of the era who differed from the crowd(later this class will be called personalities,geniuses...-Kh.G.)began to appear.If we approach the issue from the point of view of history,we witness that the world view determines the development in different periods.This idea can be expressed in such a way that each period can be considered to have developed or experienced a crisis according to the level of worldview.In this direction of our thoughts,the question arises:So,what is the phenomenon of worldview of this era-XXI century?Based on the general content of the current events,characterized as the globalization stage of the modern world,we can say that the outlook of the historical stage we live in is based on the achievements of the last stage of the industrial revolution.In this article,by analyzing the history of the artificial intelligence system during the world industrial revolutions,we will study both the concept of progress of the industrial revolutions and the progressive and at the same time regressive development of the artificial intelligence system. 展开更多
关键词 world industrial revolutions artificial intelligence DEVELOPMENT
下载PDF
Revolution 256 CT轴扫模式下不同心率患者冠状动脉CT血管成像的图像质量及辐射剂量分析
6
作者 詹秀丽 《现代医用影像学》 2024年第4期782-784,788,共4页
目的:本研究旨在评估采用Revolution 256 CT扫描仪进行冠状动脉CT血管成像(CCTA)时不同心率(HR)患者的图像质量和辐射剂量。方法:收集2022年3月—2023年3月期间90例不同心率患者的数据,根据入组时的心率将其分为三组:低心率组(HR<60b... 目的:本研究旨在评估采用Revolution 256 CT扫描仪进行冠状动脉CT血管成像(CCTA)时不同心率(HR)患者的图像质量和辐射剂量。方法:收集2022年3月—2023年3月期间90例不同心率患者的数据,根据入组时的心率将其分为三组:低心率组(HR<60bpm)、正常心率组(60bpm≤HR≤80bpm)和高心率组(HR>80bpm),各组人数均为30例,每组患者均采用Revolution 256 CT扫描仪进行CCTA检查,比较不同心率患者的图像质量和辐射剂量。结果:低心率组的图像质量最高,高心率组的图像质量最差,数据差异明显(P<0.05);统计分析表明,高心率组和低心率组在辐射剂量方面存在显著差异(P<0.05)。结论:使用Revolution 256 CT扫描仪进行CCTA检查时,低心率组和高心率组患者的图像质量均能够达到诊断标准,而且辐射剂量相对较低,因此,在使用Revolution256 CT扫描进行CCTA检查时,不同心率的患者均可采用该检查方式,无需特殊处理。 展开更多
关键词 revolution 256 CT轴扫 不同心率 冠状动脉CT 血管成像 图像质量 辐射剂量
下载PDF
Revolution CT在心律不齐患者行胸痛三联征CT血管成像中的应用 被引量:5
7
作者 弓婷婷 袁庆海 +1 位作者 滕菲 韩庆贺 《中国医学影像学杂志》 CSCD 北大核心 2023年第3期241-245,共5页
目的探讨利用Revolution CT对心律不齐患者行胸痛三联征CT血管成像检查的图像质量及可诊断性。资料与方法回顾性收集2020年1—9月在吉林大学第二医院因急性胸痛伴心律不齐行胸痛三联征CT血管成像检查的50例患者设为A组,选取同时期、相... 目的探讨利用Revolution CT对心律不齐患者行胸痛三联征CT血管成像检查的图像质量及可诊断性。资料与方法回顾性收集2020年1—9月在吉林大学第二医院因急性胸痛伴心律不齐行胸痛三联征CT血管成像检查的50例患者设为A组,选取同时期、相同对比剂剂量下心律规整且心率<80次/min的50例患者设为B组,两组均采用Revolution CT扫描,分别评价两组的图像质量,并计算辐射剂量。结果A组冠状动脉、肺动脉及主动脉的对比噪声比分别为34.98±11.11、39.08±11.93、37.82±12.08;B组分别为33.08±8.75、37.17±11.18、38.08±9.58,两组差异均无统计学意义(t=0.95、0.82、0.46,P均>0.05);两组患者冠状动脉、肺动脉及主动脉图像质量主观评分比较,差异无统计学意义(t=1.15、0.99、0.25,P均>0.05);两组有效剂量差异无统计学意义[(14.75±3.08)mSv比(13.77±2.05)mSv;t=1.84,P=0.07]。结论胸痛三联征CT血管成像中,对于心律不齐的患者采用Revolution CT扫描可以保证获得的图像满足诊断需求。 展开更多
关键词 胸痛 心律不齐 revolution CT 对比剂剂量
下载PDF
Revolution CT能谱成像技术联合肺癌血清4项对肺癌患者的诊断及疗效评估价值分析 被引量:3
8
作者 李飞 王超 +1 位作者 孙涛 李古郡 《临床和实验医学杂志》 2023年第5期528-533,共6页
目的探讨Revolution CT能谱成像技术联合肺癌血清4项对肺癌患者的诊断及疗效评估价值。方法前瞻性选择2019年6月至2022年6月来亳州市人民医院诊治的肺占位性病变患者70例,均给予肺癌血清4项及CT能谱成像检查,病理检查确诊的肺癌患者给... 目的探讨Revolution CT能谱成像技术联合肺癌血清4项对肺癌患者的诊断及疗效评估价值。方法前瞻性选择2019年6月至2022年6月来亳州市人民医院诊治的肺占位性病变患者70例,均给予肺癌血清4项及CT能谱成像检查,病理检查确诊的肺癌患者给予化疗治疗,化疗2个周期后肺癌患者再次行肺癌血清4项检查及CT能谱成像检查。分析70例患者的病理、血清、CT能谱成像检查及CA125+SCC+NSE+CYFRA21-1+CEA+CT能谱成像检查结果,分析血清及Revolution CT能谱成像检查对肺部占位性疾病的诊断效能,良恶性患者血清4项水平、CT能谱、灌注参数,分析55例肺癌患者化疗前后有效组、无效组的血清4项水平、CT能谱、灌注参数。结果70例患者的病理检查结果表明,良性15例,恶性55例。肺癌血清4项联合Revolution CT能谱成像检查、Revolution CT能谱成像检查对肺部占位性疾病的诊断阳性预测值、阴性预测值、敏感度、特异度、准确度明显较肺癌血清4项检测高,差异均有统计学意义(P<0.05)。恶性患者的血清SCC、NSE、CYFRA21-1、CEA明显较良性患者高,差异均有统计学意义(P<0.05)。良性患者的CT能谱参数明显恶性患者低,差异均有统计学意义(P<0.05);良性患者CT灌注成像参数中的血容量、血流量、毛细血管通透性明显较恶性组患者低,差异均有统计学意义(P<0.05)。55例肺癌患者化疗后,其中有效47例,无效8例。化疗前,有效组、无效组的血清SCC、NSE、CYFRA21-1、CEA水平、CT能谱、灌注参数比较,差异均无统计学意义(P>0.05);化疗后,有效组、无效组患者的血清SCC、NSE、CYFRA21-1、CEA水平、能谱CT参数及CT灌注参数中的血容量、血流量、毛细血管通透性较化疗前均降低,且有效组较无效组低,差异均有统计学意义(P<0.05)。结论Revolution CT能谱成像技术联合肺癌血清4项可用于肺癌的诊断,二者也可用于疗效评价。 展开更多
关键词 revolution CT能谱成像技术 肺癌血清4项 肺癌 诊断 疗效评价
下载PDF
GE Revolution CT在颅内动脉瘤诊疗中的应用 被引量:1
9
作者 乔娜娜 邱晓晖 +3 位作者 蒋小芳 高健磊 邓如明 王超 《局解手术学杂志》 2023年第3期254-257,共4页
目的探讨GE Revolution CT在颅内动脉瘤中的诊断价值。方法选取我院收治的高度疑为颅内动脉瘤的95例患者,均行GE Revolution CT与数字减影血管造影术(DSA)检查。以外科手术结果为“金标准”,评价GE Revolution CT检查与DSA检查对颅内动... 目的探讨GE Revolution CT在颅内动脉瘤中的诊断价值。方法选取我院收治的高度疑为颅内动脉瘤的95例患者,均行GE Revolution CT与数字减影血管造影术(DSA)检查。以外科手术结果为“金标准”,评价GE Revolution CT检查与DSA检查对颅内动脉瘤的诊断价值。患者术后随访9~12个月,采用GE Revolution CT与DSA进行复查,评价颅内动脉瘤残留情况。结果GE Revolution CT检出阳性患者75例,颅内动脉瘤98个;DSA检出阳性患者77例,颅内动脉瘤100个;手术确诊阳性患者78例,颅内动脉瘤101个。GE Revolution CT与DSA检查颅内动脉瘤部位的符合率(97.03%vs.99.01%)比较,差异无统计学意义(P>0.05)。GE Revolution CT检出颅内动脉瘤的灵敏度、特异度、准确度、阳性预测值及阴性预测值分别为96.15%、100%、96.25%、100%和40.00%,与DSA的诊断结果比较差异无统计学意义(P>0.05)。GE Revolution C T检出术后颅内动脉瘤残留5个,DSA检出4个,两种方法检出颅内动脉残留比较差异无统计学意义(P>0.05)。结论GE Revolution CT与DSA诊断颅内动脉瘤均具有较高的灵敏度、特异度与准确度,且GE Revolution CT对术后动脉瘤残留亦具有良好的评估价值,临床可将GE Revolution CT作为颅内动脉瘤早期诊断及术后评估的重要影像学检查方法。 展开更多
关键词 GE revolution CT 数字减影血管造影术 颅内动脉瘤 诊断价值
下载PDF
GE Revolution CT故障分析与检修两例
10
作者 毛东月 赵文杰 +1 位作者 王燕妮 于毅 《医疗装备》 2023年第1期111-112,共2页
Revolution CT是美国GE医疗推出的首款后超高端CT,它将超高端CT的3个技术方向——能谱成像、高时间分辨率和宽体探测器,整合为一体,引领CT进入后超高端CT时代。Revolution CT采用极速单源瞬时管电压切换技术,可在极短时间内完成高低能... Revolution CT是美国GE医疗推出的首款后超高端CT,它将超高端CT的3个技术方向——能谱成像、高时间分辨率和宽体探测器,整合为一体,引领CT进入后超高端CT时代。Revolution CT采用极速单源瞬时管电压切换技术,可在极短时间内完成高低能量的曝光和切换,实现全视野能谱“同时、同向、同源”的数据采集,并在投影数据空间进行能谱物质解析,实现CT的能谱成像。 展开更多
关键词 revolution CT GUIF板 CCB板 准直器
下载PDF
Global energy transition revolution and the connotation and pathway of the green and intelligent energy system 被引量:1
11
作者 ZOU Caineng MA Feng +10 位作者 PAN Songqi ZHAO Qun FU Guoyou ZHANG Guosheng YANG Yichao YU Hao LIANG Yingbo LIN Minjie WANG Ying XIONG Bo LIU Hanlin 《Petroleum Exploration and Development》 SCIE 2023年第3期722-740,共19页
The essence of energy system transition is the"energy revolution':The development of the"resource-dominated"energy system with fossil energy as the mainstay has promoted human progress,but it has al... The essence of energy system transition is the"energy revolution':The development of the"resource-dominated"energy system with fossil energy as the mainstay has promoted human progress,but it has also triggered energy crisis and ecological environment crisis,which is not compatible with the new demands of the new round of scientific and technological revolution,industrial transformation,and sustainable human development.It is in urgent need to research and develop a new-type energy system in the context of carbon neutrality.In the framework of"technique-dominated"new green and intelligent energy system with"three new"of new energy,new power and new energy storage as the mainstay,the"super energy basin"concepts with the Ordos Basin,Nw China as a representative will reshape the concept and model of future energy exploration and development.In view of the"six inequalities"in global energy and the resource conditions of"abundant coal,insufficient oil and gas and infinite new energy"in China,it is suggested to deeply boost"China energy revolution',sticking to the six principles of independent energy production,green energy supply,secure energy reserve,efficient energy consumption,intelligent energy management,economical energy cost;enhance"energy scientific and technological innovation"by implementing technique-dominated"four major science and technology innovation projects',namely,clean coal project,oil production stabilization and gas production increasing project,new energy acceleration project,and green-intelligent energy project;implement"energy transition"by accelerating the green-dominated"four-modernization development',namely,fossil energy cleaning,large-scale new energy,coordinated centralized energy distribution,intelligent multi-energy management,so as to promote the exchange of two 80%s"in China's energy structure and construct the new green and intelligent energy system. 展开更多
关键词 carbon neutrality new energy energy revolution primitive energy system ancient energy system neoteric energy system modern energy system new-type energy system green and intelligent energy system super energy basin Ordos Basin
下载PDF
Revolution CT行上腹部增强扫描在肝局灶性增生与肝细胞癌鉴别中的应用
12
作者 孙维斌 康露 《西藏医药》 2023年第1期21-23,共3页
目的探究Revolution CT行上腹部增强扫描在肝局灶性增生(FNH)与肝细胞癌(HCC)鉴别中的应用。方法回顾分析2021年1月~2022年9月就诊于本院的肝占位性病变患者87例的临床资料,依据患者病理结果将其分为FNH组(FNH患者,n=47)和HCC组(HCC患者... 目的探究Revolution CT行上腹部增强扫描在肝局灶性增生(FNH)与肝细胞癌(HCC)鉴别中的应用。方法回顾分析2021年1月~2022年9月就诊于本院的肝占位性病变患者87例的临床资料,依据患者病理结果将其分为FNH组(FNH患者,n=47)和HCC组(HCC患者,n=40),对比两组门脉期占位区CT值/肝组织CT值(LHRHU)、占位区碘浓度/肝组织碘浓度(LHRIC)、占位区灰度平均值,做ROC曲线分析上述指标鉴别价值,并用Logistic分析上述指标与肝脏占位病变良恶性的相关性。结果HCC组相较于FNH组,其LHRIC、LHRHU、占位区灰度平均值更低,差异有统计学意义(P<0.05),上述指标鉴别FNH和HCC的价值良好。对应的cut~off值分别为≤0.97、≤1.31、≤101.33。结论临床可将Revolution 256排CT上腹部增强扫描应用于肝脏占位性病变的筛查中,以早期诊断HCC,改善患者预后。 展开更多
关键词 revolution CT 上腹部增强扫描 肝局灶性增生 肝细胞癌
下载PDF
常规螺旋CT、256排Revolution CT与MRI对原发性肝癌行TACE后的治疗效果分析 被引量:2
13
作者 刘建涛 《影像研究与医学应用》 2023年第13期126-128,共3页
目的:探究常规螺旋CT、256排Revolution CT与MRI对原发性肝癌行肝动脉灌注化疗栓塞术(TACE)后的治疗效果。方法:选取乳山市人民医院2020年6月-2022年6月期间收治的78例行TACE的原发性肝癌患者,术后2~6个月复查时应用常规螺旋CT、256排Re... 目的:探究常规螺旋CT、256排Revolution CT与MRI对原发性肝癌行肝动脉灌注化疗栓塞术(TACE)后的治疗效果。方法:选取乳山市人民医院2020年6月-2022年6月期间收治的78例行TACE的原发性肝癌患者,术后2~6个月复查时应用常规螺旋CT、256排Revolution CT、MRI检查其病灶残留情况,以数字减影血管造影(DSA)检查结果为诊断金标准,分析常规螺旋CT、256排Revolution CT、MRI对其病灶残留的诊断效能。结果:78例患者中,经DSA诊断确定45例存在残留病灶,33例未检出残留病灶;MRI对原发性肝癌行TACE后病灶残留诊断准确率、灵敏度、特异度分别为94.87%、95.56%、93.94%,均高于常规螺旋CT的70.51%、62.22%、81.82%(P <0.05);256排Revolution CT的诊断准确率、灵敏度、特异度分别为89.74%、91.11%、87.88%,与MRI结果相近(P> 0.05)。结论:对原发性肝癌TACE术后病灶残留评估中,MRI、256排Revolution CT诊断效能相当,可结合患者实际情况选择诊断方法。 展开更多
关键词 原发性肝癌 256排revolution CT MRI 病灶残留
下载PDF
GE Revolution能谱成像定量参数在肺栓塞诊断中的应用
14
作者 刘庆轲 《中国CT和MRI杂志》 2023年第12期72-74,共3页
目的分析GE Revolution能谱成像定量参数对肺栓塞(pulmonary embolism,PE)的诊断效能。方法回顾性选取2020年1月-2022年1月在本院接受GE Revolution CT扫描检查的42例PE患者临床资料为观察组,另选取同期接受GE lightspeed 64排螺旋CT检... 目的分析GE Revolution能谱成像定量参数对肺栓塞(pulmonary embolism,PE)的诊断效能。方法回顾性选取2020年1月-2022年1月在本院接受GE Revolution CT扫描检查的42例PE患者临床资料为观察组,另选取同期接受GE lightspeed 64排螺旋CT检查的50例PE患者为对照组。对比两组患者扫描图像质量、检查时间、肺动脉CT值、有效辐射剂量和背景噪声(BN),计算对比度噪声比(CNR)、信号噪声比(SNR),评估GE Revolution定量参数对PE的诊断价值。结果观察组图像质量包括1级40例(95.24%),2级1例(2.38%),3级1例(2.38%);对照组包括1级40例(80.00%),2级8例(16.00%),3级2例(4.00%);两组图像质量分级比较,差异具有统计学意义(P<0.05)。两组患者的噪声指标BN、SNR、CNR以及肺动脉干、左肺动脉、右肺动脉、胸大肌CT值比较,组间差异无统计学意义(P>0.05)。观察组检查时间短于对照组(3.35±1.30 vs 7.62±1.12,s),有效辐射剂量低于对照组(0.84±0.09 v s 1.95±0.74,mSv)(P<0.05)。结论GE Revolution CT和GE lightspeed 64排螺旋CT均可获取PE较高质量图像,从而有助于临床快速诊断PE,但GE Revolution CT可与提高图像质量等级,并减少扫描检查时间,降低有效辐射剂量。 展开更多
关键词 肺栓塞 CT GE revolution CT 图像质量 背景噪声 诊断
下载PDF
The Debate on Democratic Revolution in Japan in the 1920s
15
作者 GUO Qi DU Fenggang JIN Huilan 《International Relations and Diplomacy》 2023年第2期101-106,共6页
Anti-hegemonic movements in Japan had occurred frequently since the early 20th century,and democratic revolution debate in the 1920s was the first significant domestic debate on future development strategy.Various dis... Anti-hegemonic movements in Japan had occurred frequently since the early 20th century,and democratic revolution debate in the 1920s was the first significant domestic debate on future development strategy.Various discussions on it from Japanese academia involved state power,absolutism,agrarian revolution,and revolutionary strategy,etc.An analysis of early Japanese scholars’perspectives on the democratic revolution helps to know about the social milieu in Japan at that time,and is of positive significance to comprehend the development process of the current Japanese democratic revolution. 展开更多
关键词 democratic revolution DEBATE democratic revolution debate JAPAN
下载PDF
Influence of Daily Cow Population on Daily Cow Milk Production in Indonesia Period 2009-2019 and Government Policy to Realize White Revolution in
16
作者 Sugiartiningsih Eddy Winarso 《Chinese Business Review》 2023年第1期22-30,共9页
The purpose of this study was to determine the effect of the population of dairy cows on milk production of dairy cows in Indonesia for the period 2009-2019 and government policies to realize the white revolution in I... The purpose of this study was to determine the effect of the population of dairy cows on milk production of dairy cows in Indonesia for the period 2009-2019 and government policies to realize the white revolution in Indonesia.The research method used is a descriptive analysis approach regarding the development of the dairy cow population and its relationship to dairy cow’s milk production in Indonesia.The type of data used is annual time series secondary data starting from 2009-2019.Based on the results of the regression,the coefficient value was 0.6677752,indicating that an increase in the population of dairy cows by 1 unit will increase the production of dairy cows in Indonesia by 0.6677752 units.The increase in dairy cow’s milk production is relatively low due to the lack of understanding of local breeders regarding dairy cow rearing and feeding to provide adequate nutrition for cows.Government policies are to realize the white revolution by paying attention to the provision of fresh milk for poor children,counseling local farmers,increasing the economic value of cow waste,and making cooperatives as a place for dairy farmers. 展开更多
关键词 POPULATION PRODUCTION dairy cows white revolution
下载PDF
Aesthetic Utopia,Revolution in Daily Life and Identity Construction of Peasant Paintings
17
作者 YANG Dong-li 《Journal of Literature and Art Studies》 2023年第1期47-60,共14页
Peasant painting is a kind of painting created by farmers as creative subject,bearing rich significance.According to the historical development of peasant painting in reality,the types of meaning it carried could be d... Peasant painting is a kind of painting created by farmers as creative subject,bearing rich significance.According to the historical development of peasant painting in reality,the types of meaning it carried could be divided into three types in chronological order:political ideological significance,folk life significance,and creative fashion significance.These three types of meaning gave rise to three types of aesthetic utopia,namely political aesthetic utopia,folk aesthetic utopia and fashion aesthetic utopia.The three types of aesthetic utopia reflected three forms of negation and revolution of daily life.What the political aesthetic utopia resisted was the alienation force of material desire.What folk aesthetic utopia resisted was the desire for material and the binding of political ideology.The fashion aesthetic utopia opposed the relatively narrow localism.Through these three forms of resistance,the public also constructed three identities:the interpreter of their own aesthetic interpretation of political ideology,the interpreter of their own aesthetic interpretation of real life from perspective of local feelings,and the interpreter of their own aesthetic interpretation of real life from perspective of the relationship between themselves and the world. 展开更多
关键词 peasant paintings aesthetic utopia daily life revolution SYMBOL IDENTITY
下载PDF
Fourth Industrial Revolution: A Readiness Assessment of Project Managers in Tanzania
18
作者 Edephonce Ngemera Nfuka 《Journal of Software Engineering and Applications》 2023年第3期73-90,共18页
The Fourth Industrial Revolution (4IR) is transforming the way we live, learn, work, and relate to one another. However, there is still an awareness inadequacy of the 4IR among project managers and the society in Tanz... The Fourth Industrial Revolution (4IR) is transforming the way we live, learn, work, and relate to one another. However, there is still an awareness inadequacy of the 4IR among project managers and the society in Tanzania, thus low readiness to conceptualize, implement and manage 4IR-related projects in the country. This study aimed to assess the 4IR readiness of project managers in Tanzania. The assessment is made in the frame of 4 readiness dimensions: strategy and governance structure, technology awareness, human capital digital skills development, and social-economic impact. The research used a quantitative method with the diffusion of innovations theory perspective, and data were collected mainly through an online survey questionnaire. The survey aimed at answering the research question concerning the project managers’ readiness for the 4IR. The 50 valid samples were completed by project managers from various industries such as agriculture, finance, consulting, construction, education and training, government, healthcare, Information Technology, and manufacturing. Data were analysed using SPSS. The results revealed that despite the generally low awareness of 4IR, several project managers in Tanzania have some varying awareness of 4IR technologies such as artificial intelligence, Internet of Things (IoT), data analytics, blockchain, robotics, cryptocurrency, chatbots, drones, and other digital transformation platforms. The results also indicated that project managers in Tanzania had little extent in readiness to initiate, develop and implement 4IR products and services due to inadequate 4IR-related awareness, strategy and governance structure, human capital digital skills development, and social economic impact. Consequently, some recommendations are made in the frame of the four assessed readiness dimensions for improvement. The value of this research is mainly to provide the state of 4IR readiness of project managers and associated recommendations to policymakers, practitioners, academia, donors, business industry and youth in digital innovation. The study also contributes to the body of knowledge on 4IR, project management and digital transformation. 展开更多
关键词 Fourth Industrial revolution 4IR Project Managers Readiness Assessment
下载PDF
Revolution CT冠状动脉成像对冠状动脉狭窄的评估价值研究
19
作者 石浩 《实用医学影像杂志》 2023年第3期226-228,共3页
目的探究Revolution CT冠状动脉成像对冠状动脉狭窄的评估价值。方法选择2020年7月至2022年9月我院收治的疑似冠状动脉粥样硬化性心脏病(CHD)患者148例作为研究对象,所有患者均行冠状动脉造影(CAG)及Revolution CT冠状动脉成像检查。将... 目的探究Revolution CT冠状动脉成像对冠状动脉狭窄的评估价值。方法选择2020年7月至2022年9月我院收治的疑似冠状动脉粥样硬化性心脏病(CHD)患者148例作为研究对象,所有患者均行冠状动脉造影(CAG)及Revolution CT冠状动脉成像检查。将CAG检查结果作为“金标准”,分析Revolution CT冠状动脉成像与CAG检查情况、Revolution CT冠状动脉成像与CAG在冠状动脉狭窄中的诊断价值,并计算Revolution CT冠状动脉成像与CAG诊断的一致性。结果148例疑似CHD患者中经CAG检查明确诊断共118例,共1210段血管节段被检测,Revolution CT检查在冠状动脉不同狭窄程度中的诊断价值对比,差异有统计学意义(P<0.05)。Revolution CT检查在冠状动脉狭窄诊断中的灵敏度为97.5%、特异度为93.3%、准确度为96.6%、阳性预测值为98.3%、阴性预测值为90.3%。Kappa检验显示,Revolution CT检查与CAG的一致性良好(Kappa值=0.897,P<0.001)。结论Revolution CT冠状动脉成像在冠状动脉狭窄评估中应用价值较高,能够明确冠状动脉狭窄程度,临床诊断准确度较高且一致性较强,为临床诊疗提供有效参考,值得推广应用。 展开更多
关键词 冠状动脉 狭窄 revolution CT 冠状动脉造影 一致性
下载PDF
The Revolution’s Result: The Change of Cuban-American Relations During the 1959-1962 Period
20
作者 XU Chaojin 《International Relations and Diplomacy》 2023年第5期217-224,共8页
Cuban-American relations have become one of the most attractive bilateral relations since the Cold War era.With historical methods and international relations theory,this paper aims to discuss the Cuban Revolution and... Cuban-American relations have become one of the most attractive bilateral relations since the Cold War era.With historical methods and international relations theory,this paper aims to discuss the Cuban Revolution and the change of Cuban-American relations through two issues.One is the Cuban Revolution and the gradual rupture of traditional Cuban-American ties,demonstrating that since Castro’s radical reform of nationalization deeply violated the economic interests of the United States,conflicts and confrontations had already been incurred.At the same time,with Moscow’s intervention,the Cuban Revolution gradually became complicated and sensitive to deal with from Washington’s perspective.The other one is the evolution of confrontation between the Castro revolutionary regime and the United States government during the 1959-1962 period.The Bay of Pigs Invasion rapidly caused political tensions in Cuban-American relations,and soon,the Cuban Missile Crisis institutionalized the escalating confrontation and deeply worsened bilateral relations.As a result,the Castro regime had no choice but to rely on Soviet assistance to maintain a delicate balance with the United States for several decades,which indicated the tragedy of the small nations’destiny. 展开更多
关键词 Cuban-American relations the Cuban revolution the Castro regime the Soviet Union
下载PDF
上一页 1 2 250 下一页 到第
使用帮助 返回顶部