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文章速递敦煌莫高窟华盖图案装饰纹样研究 认领
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作者 周咪 朱华 《设计》 2021年第1期22-24,共3页
为了更好地理解敦煌装饰艺术中的华盖图案,从敦煌文化的“源头”上为现代艺术的“支流”提供新的创意思路,文章将华盖图案的装饰纹样作为重点进行研究,在分析不同朝代华盖图案的基础上,对其纹样进行分类总结,分析其色彩应用和规律。将... 为了更好地理解敦煌装饰艺术中的华盖图案,从敦煌文化的“源头”上为现代艺术的“支流”提供新的创意思路,文章将华盖图案的装饰纹样作为重点进行研究,在分析不同朝代华盖图案的基础上,对其纹样进行分类总结,分析其色彩应用和规律。将华盖图案置于整个社会背景下,探究华盖图案的宗教及社会意义,最后对华盖纹样在现代设计中的应用提出方法。对于华盖图案进行解构有助于我们从一个新的视角来理解敦煌装饰艺术。 展开更多
关键词 华盖图案 纹样 色彩 结构 世俗性
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文章速递Recent advances in semitransparent perovskite solar cells 认领
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作者 Muhammad Mujahid Chen Chen +2 位作者 Jian Zhang Chuannan Li Yu Duan 《信息材料》 CAS 2021年第1期101-124,共24页
The environmental challenges across the world step up the researcher's interest in different energy resources.Semitransparent perovskite solar cells(STPSCs)could expedite generation of electricity as well as shows... The environmental challenges across the world step up the researcher's interest in different energy resources.Semitransparent perovskite solar cells(STPSCs)could expedite generation of electricity as well as shows reassuring its significance in flexible electronics and building-integrating photovoltaic as so forth in the next decade.It is highly recommended to endorse the relevance of semitransparent solar devices to fulfill the required level of energy even by using the roofs and windows of the buildings.In this review article,we pay more attention to recent developments of ST-PSCs.Herein,a succinct overview of latest research about semitransparent solar cell technologies and ST-PSCs is summarized.Moreover,the strategies to enhance the transparency of solar cells are described utilizing structure,transparent electrodes,perovskite film formation,tandem solar cells,color tuning,and human eye perception.Last but not least is that the serious concerns about stability of ST-PSCs are vividly reviewed. 展开更多
关键词 color tuning perovskite devices semitransparent solar cells stability transparent electrodes
新疆维吾尔自治区阿合奇县开展彩色多普勒超声检查预测胎儿窘迫研究 认领
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作者 陈钰 木尔扎扎比·木哈什 +2 位作者 赵晓玲 潘春玲 张萍 《安徽医药》 CAS 2021年第1期80-83,共4页
目的探讨运用彩色多普勒超声检测胎儿大脑中动脉、肾动脉及静脉导管的血流动力学参数值,评估其预测胎儿窘迫的价值。方法选取2017年2月至2018年2月在阿合奇县人民医院70例妊娠晚期孕妇,其中确诊为胎儿窘迫者为观察组28例,无胎儿窘迫者... 目的探讨运用彩色多普勒超声检测胎儿大脑中动脉、肾动脉及静脉导管的血流动力学参数值,评估其预测胎儿窘迫的价值。方法选取2017年2月至2018年2月在阿合奇县人民医院70例妊娠晚期孕妇,其中确诊为胎儿窘迫者为观察组28例,无胎儿窘迫者为对照组42例。采用彩色多普勒血流成像检测胎儿大脑中动脉(MCA)、肾动脉(RA)、静脉导管(DV)的各项血流动力学指标,分别统计及计算出两组胎儿的MCA、RA的搏动指数(PI)、阻力指数(RI)和血流收缩期峰值(S)与舒张期峰值(D)的比值(S/D值),两组DV的静脉搏动指数(PIV)、静脉导管分流率(QDV/QUV)和心室收缩期峰值流速(S-peak)与心房收缩期最大回流流速(A-wave)的比值(S/A值),以及两组静脉导管异常波动的发生率。结果观察组胎儿MCA的PI、RI、S/D的值[(1.27±0.30)、(0.64±0.14)、(3.64±0.72)]均低于对照组[(1.59±0.38)、(0.75±0.08)、(4.23±0.97)](P<0.01),RA的PI、RI、S/D值[(2.31±0.62)、(1.11±0.40)、(5.77±0.77)]均高于对照组[(1.56±0.42)、(0.73±0.13)、(3.06±0.92)](P<0.001),DV的PIV、S/A、QDV/QUV均高于正常组(P<0.001),观察异常波形发生率明显高于对照组(14.28%,0)(P<0.05)。胎儿MCA、RA、DV相关指标联合检测胎儿窘迫的灵敏度、特异度和Youden指数分别为92.69%,95.24%,0.87均较单一指标高。结论超声多普勒检测胎儿各项血流动力指标可明确胎儿宫内情况,各项血流动力指标的联合检测对于预测胎儿窘迫更为可靠。 展开更多
关键词 胎儿窘迫 超声检查多普勒 彩色 大脑中动脉 肾动脉 静脉导管 高海拔
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广东连南排瑶女性绣花裙探析 认领
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作者 罗龙林 胡小平 《服装设计师》 2021年第1期107-112,共6页
连南排瑶女性绣花裙款式独特,刺绣纹样组合丰富,又称“百宝裙”。文章基于田野考察与文献资料研究相结合,以广东省连南瑶族自治县内各地区具代表性的女性绣花裙藏品为研究对象,对绣花裙的种类与形制、制作工艺、色彩和刺绣纹样作分析,... 连南排瑶女性绣花裙款式独特,刺绣纹样组合丰富,又称“百宝裙”。文章基于田野考察与文献资料研究相结合,以广东省连南瑶族自治县内各地区具代表性的女性绣花裙藏品为研究对象,对绣花裙的种类与形制、制作工艺、色彩和刺绣纹样作分析,并探索绣花裙作为非遗传承载体的文化特征。进一步彰显连南瑶族服饰刺绣价值的潜在特质,为连南瑶族服饰刺绣与现代服装设计相结合提供新思路,促进连南瑶族服饰刺绣的传承与创新。 展开更多
关键词 绣花裙 形制 色彩 刺绣纹样 文化特征
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Manifestation of Color Confinement in the YY Model for Atomic Nuclei 认领
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作者 Hongguang Yang Weidong Yang 《现代物理(英文)》 2020年第12期1999-2010,共12页
In this paper, a manifestation of the well-known color confinement from the QCD (quantum chromodynamics) in the newly developed YY model for the atomic nucleus is presented. There is a wonderful correspondence between... In this paper, a manifestation of the well-known color confinement from the QCD (quantum chromodynamics) in the newly developed YY model for the atomic nucleus is presented. There is a wonderful correspondence between the structural requirements from the YY model and some elementary properties of the color dynamics from QCD. The open questions in the YY model, namely the holding forces for triple nodes and for pairing space links, are exactly covered by the three-color compensation or by the paired color anti-color balance. We will see what colors and anti-colors do mean in the YY model, how up quarks and down quarks get assigned a color or anti-color. We will discover some relationships between gluon-based interactions as described in the standard model and pairing space links in the YY model. 展开更多
关键词 Quantum Chromodynamics QCD Color Confinement YY Model for Atomic Nucleus Pairing Space Link PSL Triple Space Link TSL Colored up Quark Colored Down Quark Colored Hydrogen Nucleus Colored Helium Nucleus Colored Helium Isotope Nucleus Color Confinement Aggregate State CCAS Color-Balanced PSL Tumbling of Colored PSLs
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色彩理论在色纺产品开发中的应用研究 认领 被引量:2
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作者 张建辉 桂亚夫 《棉纺织技术》 CAS 北大核心 2020年第5期53-58,共6页
探讨色彩理论应用于色纺产品开发的技巧。选取有代表性的基饰结构色纺产品的实际案例,运用色彩感觉和对比理论对其进行色彩效果分析及优化,归纳将色相环等色彩理论工具应用于色纺产品色彩选配的方法要点,进一步列举借助电脑绘图模拟法... 探讨色彩理论应用于色纺产品开发的技巧。选取有代表性的基饰结构色纺产品的实际案例,运用色彩感觉和对比理论对其进行色彩效果分析及优化,归纳将色相环等色彩理论工具应用于色纺产品色彩选配的方法要点,进一步列举借助电脑绘图模拟法将色彩理论应用于色纺产品开发的案例,具体说明了绘图、点缀配色、修调色等实施步骤和方法技巧。认为:借助电脑绘图模拟法将色彩理论应用于色纺产品开发,能够丰富产品种类,提升产品档次,还可以降低成本,提高生产效率。 展开更多
关键词 色彩 基饰结构 色相环 色彩感觉 色彩对比 绘图模拟
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以广府建筑为例谈中国传统建筑色彩艺术特征 认领
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作者 卢嘉鑫 闫埔华 《山西建筑》 2020年第20期31-35,共5页
广府地区传统建筑色彩是中国传统建筑色彩重要组成部分,对传统建筑色彩的相关研究和借鉴应用具有较大意义。以探究广府地区传统建筑色彩的成因、影响因素、当代应用为研究重点,结合中国传统建筑中皇家建筑、民居建筑、宫殿建筑色彩的背... 广府地区传统建筑色彩是中国传统建筑色彩重要组成部分,对传统建筑色彩的相关研究和借鉴应用具有较大意义。以探究广府地区传统建筑色彩的成因、影响因素、当代应用为研究重点,结合中国传统建筑中皇家建筑、民居建筑、宫殿建筑色彩的背景,通过文献检索、实地考察等方式对广府地区民居、祠堂、园林等传统建筑进行研究。从色彩层面分析建筑整体和细部的装饰构件、门窗构件、家具、绘饰等色彩特征,探究出其成因和合理性,提出了对当代城市色彩规划和建筑色彩的设计规划思路。 展开更多
关键词 色彩 传统建筑 广府建筑 色彩心理学 色彩规划
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卷材涂料自动配色系统的应用探讨 认领
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作者 黄骏 《上海染料》 2020年第4期1-6,共6页
采用自动配色系统是卷材涂料提升生产效率的一个良好解决方案。本研究阐述了卷材涂料调色的原理和自动调色技术的应用,以及需要解决的重点问题。
关键词 色彩 色差 自动配色系统
Correlation Study of Color Doppler Examination of Deep Veins of Both Lower Extremities Combined with Fibrinolysis System in Hypertension during Pregnancy 认领
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作者 Chundong Qiu Haiyan Chen +3 位作者 Xiaohua Huang Xiaoling Kong Chong Liang Chunhong Qiu 《妇产科期刊(英文)》 2020年第8期981-989,共9页
<strong>Objective</strong><span style="font-family:Verdana;"><strong>:</strong></span><span style="font-family:Verdana;"> To investigate the correlation be... <strong>Objective</strong><span style="font-family:Verdana;"><strong>:</strong></span><span style="font-family:Verdana;"> To investigate the correlation between deep static color Doppler ultrasound of both lower extremities combined with fibrinolytic system detection in pregnancy-induced hypertension.</span><span style="font-family:""> </span><b><span style="font-family:Verdana;">Methods</span></b><b><span style="font-family:Verdana;">:</span></b><span style="font-family:Verdana;"> A total of 70 normal pregnant women, 70 pregnant women with hypertension during pregnancy, and 50 healthy non-pregnant women in the same period were selected as the research objects. The deep veins of both lower limbs were examined by Rili Erlangshen’s color Doppler ultrasound diagnostic instrument (CDU),</span><span style="font-family:""> </span><span style="font-family:""><span style="font-family:Verdana;">and the </span><span style="font-family:Verdana;">fibrinolysis system was tested by enzyme-linked immunosorbent assay (ELISA) </span><span style="font-family:Verdana;">method and </span><a name="OLE_LINK12"></a><span style="font-family:Verdana;">automatic hemagglutination analyzer.</span><b><span style="font-family:Verdana;"> Results</span></b></span><b><span style="font-family:Verdana;">:</span></b><b><span style="font-family:""> </span></b><span style="font-family:Verdana;">Compared with the non-pregnant group, the inner diameters of the left/right femoral vein (CFV) and popliteal vein (POV) in the normal pregnancy group and the pregnancy-induced hypertension group were significantly widened, and the peak blood flow spectrum was significantly reduced. The difference was statistically significant (P < 0.01);FIB, PLG, t-PA, PAI, D-Dimer were significantly increased, the difference was statistically significant (P < 0.01);Compared with the normal pregnancy group, the inner diameter of the left/right femoral vein (CFV) in the hypertensive pregnancy group was significantly wider than that in the normal pregnancy group, and the peak 展开更多
关键词 Hypertension during Pregnancy Prothrombotic State Color Doppler Ultrasound Fibrinolysis Index
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碱化条件对可可粉颜色的影响 认领
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作者 胥多 刘元法 +1 位作者 白雪 孟宗 《中国油脂》 CAS CSCD 北大核心 2020年第11期36-39,67,共5页
为了探究不同碱化条件对成品可可碱化粉颜色的影响,采用CIELAB颜色参数系统比较了可可粉/仁碱化粉的颜色值。结果表明:提高温度和压力均可以提高碱化粉的色差值(ΔE),加深碱化程度。相同温度条件(120℃)下,施加0.1 MPa压力时,可可仁碱... 为了探究不同碱化条件对成品可可碱化粉颜色的影响,采用CIELAB颜色参数系统比较了可可粉/仁碱化粉的颜色值。结果表明:提高温度和压力均可以提高碱化粉的色差值(ΔE),加深碱化程度。相同温度条件(120℃)下,施加0.1 MPa压力时,可可仁碱化粉比可可粉碱化粉的ΔE提高得多;碱化时间越长,碱化粉ΔE越大;随着碱液质量浓度的增加,碱化粉ΔE呈现增加的趋势,且高质量浓度碱液有助于碱化粉形成红色色调;K2CO3有助于增加可可仁碱化粉的ΔE,NaOH、NaHCO3对增加可可粉碱化粉的ΔE有利;随着碱液质量浓度增加,可可粉/仁碱化粉的pH均增加。 展开更多
关键词 可可粉 碱化工艺 颜色 色差 工艺条件
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Paper Clinical Value of Color Doppler Ultrasonography in Diagnosis of Lower Extremity Arterial Disease of Diabetes Patients 认领
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作者 Jianyu Zhang Haijiao Mao 《生物科学与医学(英文)》 2020年第6期209-214,共6页
<div style="text-align:justify;"> <strong>Objective:</strong> To evaluate the diagnostic value of color Doppler ultrasound in the diagnosis of diabetic lower extremity vascular diseases. &l... <div style="text-align:justify;"> <strong>Objective:</strong> To evaluate the diagnostic value of color Doppler ultrasound in the diagnosis of diabetic lower extremity vascular diseases. <strong>Methods: </strong>48 patients with diabetic lower extremity vascular disease admitted in our hos-pital from September 2018 to September 2019 were included in the study and divided into the observation group, and another 48 patients with the same period of health examination in our hospital were included in the study and divided into the control group. Both groups used color Doppler ultrasound to detect the blood flow of lower extremity vessels. The incidence of blood flow, vascular diameter and stenosis, occlusion and arteriosclerosis of the lower extremity were observed. <strong>Results:</strong> The blood flow and vascular di-ameter of the lower extremity in the observation group were significantly lower than those in the control group (p < 0.05). The incidence of vascular stenosis, vascular occlusion, thrombus, intimal thickening and plaque in the observation group was 85.42%, 22.92%, 10.42% and 93.75% respectively, which was significantly higher than that in the control group was 10.42%, 0.00%, 0.00% and 14.58% (p < 0.05). The incidence of lower extremity vascular lesions in the observation group was significantly higher than that in the control group (p < 0.05). <strong>Conclusion:</strong> Color Doppler ultrasound is of high diagnostic value in the diagnosis of diabetic lower extremity vascular diseases, and can be used to determine the blood flow of the lower extremity and the inner diameter of popliteal artery, thigh artery, dorsalis pedis artery and so on. At the same time, it can also clearly show the specific situation of vascular occlusion, arteriosclerosis and thrombosis, which is of great signif-icance for the prevention and diagnosis of lower extremity vascular lesions, and can provide the basis for the treatment of lower extremity vascular lesions. </div> 展开更多
关键词 Super Color Doppler Ultrasound Diabetic Complications Lower Extremity Vascular Disease Diagnostic Value
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食品包装设计中色彩联想性的表达、强化与发展趋势 认领
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作者 夏俐 《食品与机械》 北大核心 2020年第10期106-109,共4页
文章以色彩的联想性为切入点,根据色彩心理学相关理论,分析食品包装中的色彩元素,提升现代食品包装设计的色彩冲击力,并提升消费者视觉感受,在创造更多社会价值的同时,优化消费者的色彩体验,为品牌延伸提供色彩服务。
关键词 食品包装 色彩 联想性 情感诉求
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Spontaneous Resolution of Traumatic AV Malformation of the Uterus Following Hysteroscopic Cold Knife Evacuation of Retained Products of Conception 认领
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作者 Divyesh V. Shukla Shilpi D. Shukla +2 位作者 Amit Shah Sangita Patel Vaidehi Nene 《妇产科期刊(英文)》 2020年第6期790-801,共12页
Uterine myometrial arteriovenous malformations (AVM) are reported on color doppler ultrasonography as mosaic pattern of blood flow with different peak systolic velocities (PSV) at different places. High PSV within the... Uterine myometrial arteriovenous malformations (AVM) are reported on color doppler ultrasonography as mosaic pattern of blood flow with different peak systolic velocities (PSV) at different places. High PSV within the AVM may require arterial embolization as treatment. However, we present a case of traumatic AVM with incomplete abortion managed by hysteroscopic cold knife evacuation. This case report is of a young patient with off and on vaginal bleeding for <span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">3 1/2</span></span></span><span><span><span style="font-family:;" "=""><span style="font-family:Verdana;"> months following 2</span><sup><span style="font-family:Verdana;">nd</span></sup><span style="font-family:Verdana;"> trimester spontaneous abortion. She had undergone dilation and evacuation (D & E) for incomplete abortion. Now the bleeding was heavy and intermittent not responding to medications. The subsequent TVS examination show</span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">s</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> incomplete abortion with myometrial AVM with high PSV. Hysteroscopic cold knife removal of products of conception resulted in immediate resolution of Uterine AVM.</span></span></span> 展开更多
关键词 AVM Color Doppler Cold Knife Evacuation D & E HYSTEROSCOPY Retained Products UTERUS PSV
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Color of Vertically-Suspended Structure Does Not Impact the Growth of Rainbow Trout Reared in Circular Tanks 认领
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作者 Edgar Meza Misty D. Jones +2 位作者 Nathan Huysman Jill M. Voorhees Michael E. Barnes 《动物科学期刊(英文)》 2020年第4期706-713,共8页
This study examined the effects of five different colors of vertically-suspended environmental enrichment on the growth of juvenile Shasta strain rainbow trout (<i>Oncorhynchus mykiss</i>) during hatchery ... This study examined the effects of five different colors of vertically-suspended environmental enrichment on the growth of juvenile Shasta strain rainbow trout (<i>Oncorhynchus mykiss</i>) during hatchery rearing in circular tanks. The colors used were silver (unpainted aluminum—control), safety red, semi-gloss black, hunter green, and safety blue. After 86 days, total tank weight, weight gain, and feed conversion ration were not significantly different among any of the color treatments. Individual fish weights, lengths, and condition factors were also not significantly different among the treatments. The results of this study indicate that the relatively small amount of color present on the suspended structure did not affect rainbow trout growth. Thus, the inherent silver color of the aluminum angles does not need to be changed. 展开更多
关键词 Environmental Enrichment Oncorhynchus mykiss SALMONIDS COLOR
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Analysis the Influenced of Plain and Twill Structures on Woven Fabric Properties 认领
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作者 Monour Khan Hasan Mahmud +5 位作者 Tirtha Sarathi Das Muhammad Abdullah Tushar Rahman Khan Rokibul Hasan Shohan Sajid Al Rafi Md Solaiman 《纺织科学与技术(英文)》 2020年第3期107-113,共7页
Fabric outer appearance is influenced by various fabric structures. In this research work, the physical properties of plain and twill were analyzed. Physical, mechanical and other aesthetic properties are also tested ... Fabric outer appearance is influenced by various fabric structures. In this research work, the physical properties of plain and twill were analyzed. Physical, mechanical and other aesthetic properties are also tested and the finding results are also compared between two samples. After testing the samples it is found that rubbing fastness remains unchanged for plain and twill fabric. Abrasion resistance, pilling, crease recovery and cover factor were evaluated for twill and plain structures using ISO 12945-2, ISO 12945-1 and ISO 2313 methods respectively. Abrasion resistance and pills property are not good for twill fabric in comparison with plain fabric but crease recovery is better of twill fabric. 展开更多
关键词 ABRASION PILLING Crease Recovery Color Fastness Cover Factor EPI & PPI
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Analysis on the Application of Image Processing Technology in Clothing Pattern Recognition 认领
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作者 刘静 庄梅玲 +1 位作者 艾容羽 高婷 《东华大学学报:英文版》 EI CAS 2020年第3期224-231,共8页
A clothing pattern is a significant embodiment of regional culture and national characteristics.The recognition of clothing patterns could be realized objectively and accurately by using digital image processing techn... A clothing pattern is a significant embodiment of regional culture and national characteristics.The recognition of clothing patterns could be realized objectively and accurately by using digital image processing technology.The researches on the extraction techniques of various pattern elements were compared and analyzed.Then the researches on clothing pattern color,outline and fabric texture extraction were summarized.And the core technology chain model of clothing pattern extraction was constructed.The research status,the core technology and the development trend of pattern element extraction technology based on two-dimensional images were obtained.What’s more,a reference for the follow-up research of clothing patterns and the technology upgrading of textile and clothing industries were provided. 展开更多
关键词 image filtering color space color clustering edge detection clothing pattern
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Comparative Slaughter Performance and Meat Quality of Rutana, Gumuz and Washera Sheep of Ethiopia Supplemented with Different Levels of Concentrate 认领
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作者 Anteneh Worku Mengistu Urge +1 位作者 Getachew Animut Getnet Asefa 《动物科学期刊(英文)》 2020年第1期48-63,共16页
A study was conducted to compare the carcass yield and meat quality of Rutana, Gumuz and Washera sheep of Ethiopia under two concentrate supplement levels (CSL), low (300 g/day) and high (450 g/day). The supplement co... A study was conducted to compare the carcass yield and meat quality of Rutana, Gumuz and Washera sheep of Ethiopia under two concentrate supplement levels (CSL), low (300 g/day) and high (450 g/day). The supplement contains 45% wheat bran, 26% maize grain and 29% Noug cake. A total of 36 sheep (12 from each genotype) were used in 3 × 2 factorial treatment arrangement (3 genotypes and 2 CSL) which was used in a completely randomized block design. Hay was fed ad libitum at a rate of 20% refusal. After the completion of 90 days fattening period, all sheep were slaughtered and meat sample from longissimus dorsi muscle of each animal was taken for sensory evaluation and instrumental measurement of tenderness and for color, pH, and chemical composition analysis. Slaughter body weight (SBW) (26.0 vs. 24.1 kg), hot carcass weight (HCW) (11.3 vs. 9.7 kg), dressing percentage (DP) on SBW (43.4% vs. 40.1%) and EBW basis (53.6% vs. 50.9%), and rib eye-muscle (REM) were higher for the high than low CSL. Rutana sheep had heavier HCW (11.9 kg) than Gumuz (10.1 kg) and Washera (9.4 kg) sheep. DP on EBW basis was higher for Rutana (54.7) than Washera sheep (48.1), while the value for Gumuz (50.9) was similar with both genotypes. Meat from high supplemented sheep had higher fat (9.7% vs. 8.8%), tenderness, juiciness, flavor and lower shear forces than the low level of supplementation. Most sensory parameters measured were in the order of Rutana > Gumuz > Washera sheep. It is concluded that Rutana sheep were relatively more suitable than Gumuz and Washera sheep for production of better carcass yield. The potential of Washera sheep to produce more carcass yield relative to their HCW, SBW and EBW was comparable with that of Gumuz sheep. 展开更多
关键词 DRESSING PERCENTAGE CARCASS and Non-Caracara Parameters Meat Color PROXIMATE Compositions Sensory Evaluation Shear Force Supplement SHEEP
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A Logical Proof of the Four Color Problem 认领
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作者 Yu Wang 《应用数学与应用物理(英文)》 2020年第5期831-837,共7页
The Four Color Conjecture is a well-known coloring problem of graphs. Since its advent, there are a lot of solvers. One of the early pioneers was Percy John Heawood, who has proved the Five Color Theorem. In addition,... The Four Color Conjecture is a well-known coloring problem of graphs. Since its advent, there are a lot of solvers. One of the early pioneers was Percy John Heawood, who has proved the Five Color Theorem. In addition, Kempe first demonstrated an important conclusion about planar graph: in any map, there must be a country with five or fewer neighbors. Kempe’s proof proposed two important concepts—“configuration” and “reducibility”, which laid the foundation for further solving the Four Color Problem. The Four Color Problem had previously been proved by use of computer. Based on Kempe’s concepts of “configuration” and “reducibility”, this paper attempts to provide a non-computer proof of the Four Color Problem through rigorous logical analysis. 展开更多
关键词 GRAPH Theory PLANAR GRAPH GRAPH COLORING Four COLOR THEOREM LOGIC
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Evaluation of Prognosis of Brain Function with Early Transcranial Color Doppler Ultrasound in Patients after Cardiopulmonary Resuscitation 认领
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作者 Hui Guo Zhangshun Shen +4 位作者 Ning Xu Qian Zhao Hongling Li Yangjuan Jia Jianguo Li 《心血管病(英文)》 2020年第9期658-665,共8页
<strong>Objective</strong><span style="font-family:;" "=""><span style="font-family:Verdana;"><strong>: </strong>To evaluate the clinical value of... <strong>Objective</strong><span style="font-family:;" "=""><span style="font-family:Verdana;"><strong>: </strong>To evaluate the clinical value of transcranial color Doppler ultrasound (TCCD) in assessing cerebral function after cardiopulmonary resuscitation (CPR). </span><b><span style="font-family:Verdana;">Methods</span></b><span style="font-family:Verdana;">: A prospective study was conducted in 52 patients with cardiac arrest treated by CPR from January 2018 to January 2020, and its clinical data were analyzed</span></span><span style="font-family:Verdana;">. </span><span style="font-family:;" "=""><span style="font-family:Verdana;">According to classification of cerebral performance category (CPC), 31 cases (CPC grade 1 - 2) were selected in the good prognosis group and 21 cases (CPC grade 3 - 5) in the poor prognosis group. The cerebral blood flow was measured by transcranial Doppler ultrasound (TCCD) 24 h after CPR, and the differences were compared between the two groups in stroke index, diastolic blood flow velocity (Vd), systolic peak blood flow velocity (Vs) and mean peak blood flow velocity (Vm). The ROC curve of cerebral blood flow after CPR was drawn to predict the prognosis of brain function. </span><b><span style="font-family:Verdana;">Results</span></b><span style="font-family:Verdana;">: The data showed that the pulsatility index of middle cerebral artery of the poor prognosis group decreased within 24 h</span></span><span style="font-family:Verdana;">;</span><span style="font-family:Verdana;">the difference between the two groups was statistically significant (p < 0.05);the Vd, Vs, Vm increased in the good prognosis group</span><span style="font-family:Verdana;">;</span><span style="font-family:;" "=""><span style="font-family:Verdana;">the difference between the two groups was statistically significant (p < 0.05). The ROC curve of cerebral blood flow after CPR was drawn to predict the prognosis of brain function, and the results showed that the area under the curve and the optimal critical va 展开更多
关键词 Cardiopulmonary Resuscitation (CPR) Transcranial Color Bifunctional Ultrasound (TCCD) Cerebral Blood Flow Prognosis of Brain Function
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The Diagnostic Value of Color Doppler Ultrasound and Grey Scale Sonography in Predicting the Malignancy of Thyroid Nodules 认领
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作者 Hamad Elniel H. Eltyib Sameh A. Aborizk +2 位作者 Hanan A. Albalawi Afaf S. Almotairi Arwa H. Aidrus 《放射学期刊(英文)》 2020年第4期215-222,共8页
Retrospective study was done at KAUH to determine the sonographic characteristics in predicting the malignancy of thyroid nodules. The sample was 120 patients consisting of 70 benign nodules and 50 malignant nodules. ... Retrospective study was done at KAUH to determine the sonographic characteristics in predicting the malignancy of thyroid nodules. The sample was 120 patients consisting of 70 benign nodules and 50 malignant nodules. Out of 120 patients, 106 (88.3%) female and 14 (11.7%) male patients. Out of 106 female patients, 64 (91.45) had benign and 42 had malignant thyroid nodules. Out of 14 (11.7) male patients, 6 had benign and 8 had malignant thyroid nodules. The youngest patient in our study was 31 years and the oldest patient was 76 years. The common range of patients age was ≥ 60 years and consisting of twenty (28.6%) benign thyroid nodules and fourteen (28%) malignant thyroid nodules. The majority of patients’ age group with malignant thyroid nodules were between 50 - 60 years and consisting of twenty (40%) malignant nodules. In our study, according to the result of gray scale and color Doppler ultrasonography, hypo-echogenicity, solid echo structure, micro-calcification and intra-nodular vascularity were the significant characteristics of malignancy in nodules with sensitivity (72%, 74%, 48% and 88% respectively), specificity (66%, 63%, 94% and 69% respectively), PPV (60%, 59%, 86% and 67% respectively) and NPV (77%, 77%, 72% and 89% respectively). 展开更多
关键词 ULTRASOUND Thyroid Nodules MALIGNANT Color Doppler Fine Needle Aspiration
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