检索结果-南通市图书馆

Journal of Rare Earths 2024年第8期42卷 1421-1428,I0001页

作者： Yunxiao Ma Chao Linghu Ming Yang Hui Yu xiangting Dong long xia School of Chemistry and Environmental Engineering Changchun University of Science and TechnologyChangchun130022China School of Materials Science and Engineering Harbin Institute of Technology(Weihai)Weihai264209China

Light emitting diode(LED) is the fourth generation lighting source,but it has some shortcomings such as complex chip packaging process and the unbalanced light color of phosphor in long-time *** this study,a kind of Eu-terephthalic acid/Tb-sulfosalicylate/ZrO_(2)/ZnZrO_(3)(Eu-PTA/Tb-SSA/ZrO_(2)/ZnZrO_(3))phosphor with warm white light emission properties was prepared,and the warm white light LED(wWLEDs) was successfully prepared by encapsulating Eu-PTA/Tb-SSA/ZrO_(2)/ZnZrO_(3) phosphors together with 270 nm *** ZrO_(2)/ZnZrO_(3),Tb-SSA/ZrO_(2)/ZnZrO_(3) and Eu-PTA/ZrO_(2)/ZnZrO_(3) samples show blue emission,green emission and red emission under deep ultraviolet(UV,270 nm) excitation,*** Tb-SSA and Eu-PTA are co-doped into ZrO_(2)/ZnZrO_(3) matrix with blue emission to achieve the warm white light emission,and the light color can be adjusted by controlling the doping amount of Eu^(3+)-and Tb^(3+).Through the excitation method of single-component phosphor by the single chip,the complex chip packaging process of w-LED can be *** doping rare earth organic complexes into porous ZrO_(2)/ZnZrO_(3) matrix,the problems of the light color unbalanced of phosphor and the low luminescence intensity of rare earth doped metal oxides composites can be solved.

关键词： Eu-PTA/Tb-SSA/ZrO_(2)/ZnZrO_(3) Luminescence material Light color adjustable phosphor Warm white emission W-WLEDs Rare earths

Facile fabrication of graphene/g-C_(3)N_(4) for electromagnetic wave absorption

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第3期17卷 1687-1698页

作者： Qiang Su Yunfei He Dongdong Liu Daguang Li long xia xiaoxiao Huang Bo Zhong School of Materials Science and Engineering Harbin Institute of Technology WeihaiWeihai 264209China Weihai Yunshan Technology Co. Ltd.Weihai 264200China State Key Laboratory on Integrated Optoelectronics College of Electronic Science&EngineeringJilin UniversityChangchun 130012China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

With the development of the miniaturization of electronic equipment and lightweight weapon equipment,there are new requirements for electromagnetic wave absorption material(EMWAM).EMWAM has outstanding electromagnetic wave absorption properties and lightweight characteristics become an important direction of *** this study,graphene/g-C_(3)N_(4)(GGCN)EMWAM was first synthesized in situ by simple heat treatment,in which the g-C_(3)N_(4) had a porous structure and dispersed on the surface of *** impedance matching of the GGCN was well adjusted by decreasing the dielectric constant and attenuation constant due to the g-C_(3)N_(4) semiconductor property and the graphite-like *** EMW loss mechanism of GGCN was also analyzed by simulating GGCN’s electric field mode distribution and resistance loss power *** analysis result shows that the distribution of g-C_(3)N_(4) among GGCN sheets can produce more polarization effects and relaxation effects by increasing the lamellar ***,the polarization loss of GGCN could be increased successfully by porous g-C_(3)N_(4).Ultimately,the EMW absorption property of GGCN is optimized significantly,and GGCN exhibits excellent EMW absorption *** the thickness is 2 mm,the effective absorption bandwidth(EAB)can reach 4.6 GHz,and when the thickness is 4.5 mm,the minimum reflection loss(RLmin)at 4.56 GHz can reach-34.69 ***,the practical application of EMWAM was studied by radar cross-section(RCS)simulation,showing that GGCN has a good application prospect.

关键词： graphene/g-C_(3)N_(4) impedance matching simulation analysis dielectric loss excellent electromagnetic wave absorption

Relationship of inflammatory indices with left atrial appendage thrombus or spontaneous echo contrast in patients with atrial fibrillation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第21期12卷 4550-4557页

作者： Zhao Wang Bin-Hao Wang xiao-Lei Yang Yun-long xia Sheng-Min Zhang Ying Che Department of Ultrasonography First Affiliated Hospital of Dalian Medical UniversityDalian 116000Liaoning ProvinceChina Arrhythmia Center First Affiliated Hospital of Ningbo UniversityNingbo 315000Zhejiang ProvinceChina Department of Cardiology First Affiliated Hospital of Dalian Medical UniversityDalian 116000Liaoning ProvinceChina Department of Ultrasonography First Affiliated Hospital of Ningbo UniversityNingbo 315000Zhejiang ProvinceChina

BACKGROUND Inflammatory indices derived from complete blood tests have been reported to be associated with poor outcomes in patients with atrial fibrillation(AF).The data about the relationship between inflammatory indices and left atrial appendage thrombus(LAAT)or dense spontaneous echo contrast(SEC)are *** To explore the value of inflammatory indices for predicting the presence of LAAT or dense SEC in nonvalvular AF *** A total of 406 patients with nonvalvular AF who underwent transesophageal echocardiography were included and divided into two groups based on the presence(study group)or absence(control group)of LAAT or dense *** indices,including the neutrophil-to-lymphocyte ratio(NLR),platelet–tolymphocyte ratio(PLR),and lymphocyte-to-monocyte ratio(LMR),were calculated from complete blood *** associations of inflammatory indices RESULTS LAAT and dense SEC were detected in 11(2.7%)and 42(10.3%)patients,*** PLR only showed an association with LAAT/dense SEC in the univariate *** NLR(odds ratio[OR]=1.48,95%confidence interval[CI]:1.11-1.98,P=0.007)and reduced LMR(OR=0.59,95%CI:0.41-0.83,P=0.003)were found to be independent risk factors for the presence of LAAT/dense *** areas under the NLR and LMR curves for predicting LAAT/dense SEC were 0.73(95%CI:0.66-0.80,P<0.001)and 0.73(95%CI:0.65-0.81,P<0.001),respectively,while the cutoff values were 2.8(sensitivity:69.8%;specificity:64.0%)and 2.4(sensitivity:71.7%;specificity:60.6%),*** Increased NLR and decreased LMR may predict LAAT/dense SEC in patients with nonvalvular AF.

关键词： Nonvalvular atrial fibrillation Left atrial appendage thrombus Spontaneous echo contrast Neutrophil–lymphocyte ratio Lymphocyte–monocyte ratio

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

5G弱场下的上行增强技术研究及应用

电信工程技术与标准化 2024年第6期37卷 33-36页

作者：夏龙根中国移动通信集团广东有限公司佛山分公司佛山528000

为解决目前5G网络因普遍采用中高频段频率组网而产生的小区边缘上行能力短板,本文针对不同的无线环境特征及技术需求,通过研究时隙配比优化、调制及波形转换、资源调度等技术的场景化应用,提升5G弱场环境下的上行速率,从而满足5G上行应... 详细信息

为解决目前5G网络因普遍采用中高频段频率组网而产生的小区边缘上行能力短板,本文针对不同的无线环境特征及技术需求,通过研究时隙配比优化、调制及波形转换、资源调度等技术的场景化应用,提升5G弱场环境下的上行速率,从而满足5G上行应用需求。相关技术已推广应用。

关键词：上行速率智能AMC 多点协作联合接收

彩色多普勒在尿毒症继发性甲状旁腺功能亢进中的临床应用分析

在线全文

学校读者我要写书评

暂无评论

中国医疗器械信息 2024年第11期30卷 87-90页

作者：陈隆霞北海市人民医院超声科广西北海536000

目的:探究彩色多普勒在尿毒症继发性甲状旁腺功能亢进中的诊断效能。方法:择取2021年11月~2023年12月本院收治的80例尿毒症患者作为观察对象,均采用彩色多普勒超声诊断,以手术病理结果为金标准,分析其诊断效能。结果:术后病理检查确诊... 详细信息

目的:探究彩色多普勒在尿毒症继发性甲状旁腺功能亢进中的诊断效能。方法:择取2021年11月~2023年12月本院收治的80例尿毒症患者作为观察对象,均采用彩色多普勒超声诊断,以手术病理结果为金标准,分析其诊断效能。结果:术后病理检查确诊继发性甲状旁腺功能亢进患者50例,彩色多普勒超声检出45例。彩色多普勒超声诊断阳性及阴性检出率与金标准相比无差异(P>0.05);两种诊断方法灵敏度、特异度对比无差异(P>0.05);两种诊断方法准确度对比有差异(P<0.05)。结论:彩色多普勒超声在尿毒症继发性甲状旁腺功能亢进患者中的诊断价值较高,诊断效能仅次于金标准。

关键词：彩色多普勒尿毒症甲状旁腺功能亢进诊断效能

OCTEM法探测地下空间地质病害体的应用研究

在线全文

学校读者我要写书评

暂无评论

铁道科学与工程学报 2024年第8期21卷 3434-3444页

作者：杨旭东席振铢龙霞黄基文中南大学房产管理处湖南长沙410083 中南大学地球科学与信息物理学院湖南长沙410083 湖南五维地质科技有限公司湖南长沙410025

城镇地下空间地质病害体造成地面塌陷事故时有发生,对人民群众的生命财产安全构成巨大威胁。采用地球物理方法探测和预报地下空间地质病害体是预防城镇地面塌陷事故的重要方案。瞬变电磁法(TEM)是探测地下空间地质病害体的重要方法之一... 详细信息

城镇地下空间地质病害体造成地面塌陷事故时有发生,对人民群众的生命财产安全构成巨大威胁。采用地球物理方法探测和预报地下空间地质病害体是预防城镇地面塌陷事故的重要方案。瞬变电磁法(TEM)是探测地下空间地质病害体的重要方法之一。等值反磁通瞬变电磁法(OCTEM)采用免接地、小体积、弱耦合的收发一体小型天线,便于在城镇硬化地面及施工空间受限的场地进行快速探测。本文结合理论计算和实际应用来研究OCTEM对地下地质病害体的探测能力。首先基于矢量有限元实现OCTEM三维正演,研究不同地电类型地质病害体的OCTEM响应特征。根据地下地质病害体的电性特征,构建了纯低阻型、纯高阻型、低阻-高阻复合型3类地质病害体地电模型,对比分析不同地电类型的地质病害体的异常响应,并计算包含地质病害体时的响应与不包含地质病害体时的背景响应之间的相对异常。计算结果表明:OCTEM对纯低阻型和低阻-高阻复合型地质病害体比较敏感,对纯高阻型地质病害体相对不敏感。对于低阻型或低阻高阻复合型地质病害体,低阻部分与围岩电阻率差异越大、厚度越大、埋深越浅,则相对异常越大,越容易被探测。随着深度加大,OCTEM探测分辨能力将减小。最后,通过在湖南浏阳某村镇试验剖面探测地下岩溶地质病害体案例,分析OCTEM的探测效果。

关键词：等值反磁通瞬变电磁法探测地下空间地质病害体相对异常

桑叶冷冻超微粉制备及对曲奇饼干抗氧化性能的影响

在线全文

学校读者我要写书评

暂无评论

中国食物与营养 2024年第10期30卷 5-9,15页

作者：王龙霞纵伟河南省计量标准和产品质量检验检测中心郑州450000 郑州轻工业大学食品与生物工程学院郑州450000

目的:采用冷冻超微粉碎方式制备桑叶超微粉,并研究其对曲奇饼干抗氧化性能的影响。方法:以超微粉颗粒粒径D50为指标,在单因素试验的基础上,采用正交试验优化桑叶粉的冷冻超微粉碎工艺条件,并以常规粗粉碎制备的桑叶粉为对照,将其添加在... 详细信息

目的:采用冷冻超微粉碎方式制备桑叶超微粉,并研究其对曲奇饼干抗氧化性能的影响。方法:以超微粉颗粒粒径D50为指标,在单因素试验的基础上,采用正交试验优化桑叶粉的冷冻超微粉碎工艺条件,并以常规粗粉碎制备的桑叶粉为对照,将其添加在曲奇饼干中,研究其对饼干酸价、过氧化值、总黄酮含量和总酚含量的影响。结果:优化的冷冻超微粉碎条件为水分含量6%、粉碎温度-18℃、粉碎时间22min,该条件下制备的桑叶粉粒径D50为11.31μm。添加冷冻超微桑叶粉的饼干的抗氧化性能优于添加常规粗粉碎桑叶粉的饼干的抗氧化性能,冷冻超微粉碎桑叶粉对曲奇饼干的酸价、过氧化值的抑制作用和其中的黄酮、多酚含量密切相关。结论:本研究可为桑叶资源的精深加工提供理论指导。

关键词：桑叶冷冻超微粉碎曲奇饼干抗氧化

Intrinsic mechanism and multiphysics analysis of electromagnetic wave absorbing materials: New horizons and breakthrough

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第35期130卷 136-156页

作者： long xia Yuming Feng Biao Zhao School of Materials Science and Engineering Harbin Institute of Technology at WeihaiWeihai 264209China School of Microelectronics Fudan UniversityShanghai 200433China

Electromagnetic absorbers(EMA) have driven the development of Electromagnetic(EM) technology and advanced EM devices. Utilizing the EM energy conversion of EM absorbers to design various devices is attractive and promising, especially in personal protection and healthcare. In this review article, the simulation and numerical analysis of EM materials are reviewed, from numerical analysis of dielectric parameters, simulation of wave absorbing performance, electromagnetic performance improvement, and structural construction optimization. For the EM response mechanism, radiation-dependent relaxation and charge transport energy transitions are dissected. For the EM calculation section, two leading roles are highlighted, including the purposeful design of EM and the provision of theoretical guidance for optimizing electromagnetic absorption performance. In addition, this work points out the current problems and potential opportunities in the numerical simulation of absorbing materials, points out the new development direction, and proposes prospects.

关键词： Microwave absorption Multiphysics simulation Dielectric parameters EMA Properties optimization

Quantum Key Distribution Scheme Based on Dense Encoding in Entangled States

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第4期43卷 627-630页

作者： ZHANGxiao-long ZHANGYue-xia GAOKe-Lin StateKeyLaboratoryofMagneticResonanceandAtomicandMolecularPhysics WuhanInstituteofPhysicsandMathematicstheChineseAcademyofSciencesWuhan430071China

A quantum key distribution protocol, based on the quantum dense encoding in entangled states, is presented. In this protocol, we introduce an encoding process to encode two classical bits information into one of the four one-qubit unitary operations implemented by Alice and the Bell states measurement implemented by Bob in stead of direct measuring the previously shared Einstein-Podolsky-Rosen pairs by both of the distant parties, Alice and *** the practical application we can get the conclusion that our protocol has some advantages. It not only simplifies the measurement which may induce potential errors, but also improves the effectively transmitted rate of the generated qubits by the raw key. Here we also discuss eavesdropping attacks against the scheme and the channel loss.

关键词： quantum key distribution dense coding quantum entanglement

白羽王鸽CAPN11基因SNPs鉴定及其对屠宰性状的影响

在线全文

学校读者我要写书评

暂无评论

农业生物技术学报 2024年第10期32卷 2381-2390页

作者：向进龙霞庞金兰成敏张依裕杨阿明贵州大学动物科学学院/高原山地动物遗传育种与繁殖重点实验室/贵州省动物遗传育种与繁殖重点实验室黔西市农业农村局贵州裕黔农业生物科技发展有限公司

白羽王鸽（Columba livia）是重要的经济禽类，探究其钙蛋白酶11 （calpain 11, CAPN11）基因多态性与屠宰性状的关系，对其屠宰性状的遗传改良和经济性状提升具有重要意义。本研究采用PCR直接测序法对白羽王鸽CAPN11基因SNP进行筛查，... 详细信息

白羽王鸽（Columba livia）是重要的经济禽类，探究其钙蛋白酶11 （calpain 11, CAPN11）基因多态性与屠宰性状的关系，对其屠宰性状的遗传改良和经济性状提升具有重要意义。本研究采用PCR直接测序法对白羽王鸽CAPN11基因SNP进行筛查，并分析SNP位点与白羽王鸽屠宰性状的关联性。通过鉴定白羽王鸽的CAPN11基因的SNPs发现，在外显子6区的第636和738位发现g.3641644 C>T和g.3641746 C>T 2个同义突变，均存在3种基因型，优势基因型和优势等位基因均为CT和C,0.252检验显示，2个SNPs位点的基因型分布均符合Hardy-Weinberg平衡状态（P>0.05）；连锁不平衡分析显示，2个SNPs位点之间不满足D'>0.80,r2>0.33，表明不存在强连锁不平衡效应；关联性分析显示，g.3641644 C>T位点对宰前活重的影响达到显著水平（PT位点对白羽王鸽的宰前活重、屠体重、全净膛重、胸肌重和腿肌重等屠宰性状的影响均达到了显著水平（P<0.05）；双倍型分析发现，2个SNPs位点在实验群体中共检测到4种单倍型和10种双倍型，双倍型H2H2 （CCTT）个体的宰前活重、屠体重、全净膛重和腿肌重均显著高于其他9种双倍型（P<0.05）；双倍型H2H2 （CCTT）个体的胸肌重显著高于除双倍型H3H3 （TTCC）和H3H4 （TTCT）外的其他双倍型个体（P<0.05）。通过分析单倍型m RNA二级结构发现，单倍型H1 （CC）、H2 （CT）、H3 （TC）均引起了CAPN11基因的mRNA二级结构变化，可能会影响转录和翻译效率，进而影响屠宰性能。综上，CAPN11基因能够作为潜在候选基因用于改善白羽王鸽屠宰性状，为加速白羽王鸽育种选育进程提供一定的理论依据，为提升品种屠宰性状的分子标记选育工作提供参考。

关键词：白羽王鸽钙蛋白酶11基因(CAPN11) SNPs 屠宰性状