搜索筛选:
搜索耗时0.0210秒,为你在102,276,849篇论文里面共找到 1,000,847篇文章
类      型:
[期刊论文] 作者:Xue Jiang,JiaJie He,ChuanXin Zhang,HuaLiang Zhao,WeiQi Wang,DeAn Ta,Cheng-Wei Qiu, 来源:中国科学:物理学 力学 天文学(英文版) 年份:2022
Ultrasound focusing in three-dimensional(3D)space is of crucial and enduring significance in a variety of biomedical and industrial applications.Conventional ultrasound focusing based on active phase array or passive geometry of bulky size is unable to re...
[期刊论文] 作者:Jie Li,Jitao Li,Chenglong Zheng,Longhai Liu,Zhen Yue,Hang Xu,Xuanruo Hao,Fuyu Li,Tingting Tang,Yating Zhang,Jianquan Yao, 来源:中国科学:物理学 力学 天文学(英文版) 年份:2022
Terahertz absorbers based on doped silicon have achieved broadband and high-efficiency absorption due to their high con-centration of carriers.However,their tunable performance is obviously insufficient.Here,we propose a new scheme for active terahertz ab...
[期刊论文] 作者:Weiming ZHANG,Huimin XIANG,Fu-Zhi DAI,Biao ZHAO,Shijiang WU,Yanchun ZHOU, 来源:先进陶瓷(英文版) 年份:2022
Electronic devices pervade everyday life,which has triggered severe electromagnetic(EM)wave pollution.To face this challenge,developing EM wave absorbers with ultra-broadband absorption capacity is critically required.Currently,nano-composite construction...
[期刊论文] 作者:Yang Tan,Bin Liang,Jianchun Cheng, 来源:中国物理B(英文版) 年份:2022
In the past decade,one-way manipulation of sound has attracted rapidly growing attention with application potentials in a plethora of scenarios ranging from ultrasound imaging to noise control.Here we propose a design of a planar device capable of unidire...
[期刊论文] 作者:Peng Sun,Mengdie Zhang,Fengliang Dong,Liefeng Feng,Weiguo Chu, 来源:中国光学快报(英文版) 年份:2022
Metalenses are expected to play an increasingly important role in miniaturized and integrated optical imaging components/systems.However,devising broadband achromatic metalenses with high focusing efficiencies is still quite challenging.In this work,we pr...
[期刊论文] 作者:Tao Wang,He-He He,Meng-Di Ding,Jian-Bo Mao,Ren Sun,Lei Sheng, 来源:中国物理B(英文版) 年份:2022
For potential military applications,a flexible metamaterial absorber(MMA)working on whole K-bands with total-thickness of 3.367 mm,ultra-broadband,polarization-insensitive,and wide-angle stability is presented based on frequency-selective surface(FSS).The...
[期刊论文] 作者:Song Zhang,Man Jiang,Can Li,Rongtao Su,Pu Zhou,Zongfu Jiang, 来源:中国光学快报(英文版) 年份:2022
The generation of supercontinuum[SC]often requires ultrashort pulsed lasers with high peak power and gain media with large nonlinear coefficients,such as a long piece of fiber or photonic crystal fiber.In this Letter,we propose and dem-onstrate that high-...
[期刊论文] 作者:孙朋,张梦蝶,董凤良,冯列峰,褚卫国, 来源:ChineseOpticsLetters 年份:2022
Metalenses are expected to play an increasingly important role in miniaturized and integrated optical imaging components/systems. However, devising broadband achromatic metalenses with high focusing efficiencies is still quite challenging. In this work, w...
[期刊论文] 作者:Wei-Ming Sun,Bing-Yang Sun,Shan Li,Guo-Liang Ma,Ang Gao,Wei-Yu Jiang,Mao-Lin Zhang,Pei-Gang Li,Zeng Liu,Wei-Hua Tang, 来源:中国物理B(英文版) 年份:2022
The symmetric Ti/Au bi-layer point electrodes have been successfully patterned on the β-Ga2O3 films which are prepared by metal-organic chemical vapor deposition (MOCVD) and the γ-CuI films which are prepared by spin-coating.The fabricated heterojunction...
[期刊论文] 作者:Ming Zheng Chen,Wankai Tang,Jun Yan Dai,Jun Chen Ke,Lei Zhang,Cheng Zhang,Jin Yang,Lianlin Li,Qiang Cheng,Shi Jin,Tie Jun Cui, 来源:国家科学评论(英文版) 年份:2022
We propose a theoretical mechanism and new coding strategy to realize extremely accurate manipulations of nonlinear electromagnetic harmonics in ultrawide frequency band based on a time-domain digital coding metasurface (TDCM).Using the proposed mechanism...
[期刊论文] 作者:Ming LI,Zhiqun LI,Quan ZHENG,Lanfeng LIN,Hongqi TAO, 来源:信息与电子工程前沿(英文版) 年份:2022
A gallium nitride (GaN) power amplifier mono-lithic microwave integrated circuit (MMIC) with a wide band and high efficiency in the microwave fre-quency band is proposed in this study. The power am-plifier MMIC uses a 0.15 μm GaN high electron mo-bility t...
[期刊论文] 作者:Wei Wang,Qinpeng Chen,Yifei Zhao,Yakun Le,Shengda Ye,Mang Wan,Xiongjian Huang,Guoping Dong, 来源:中国光学快报(英文版) 年份:2022
With the rapid growth of optical communications traffic,the demand for broadband optical amplifiers continues to increase.It is necessary to develop a gain medium that covers more optical communication bands.We precipitated PbS quantum dots[QDs]and BaF2 ∶...
[期刊论文] 作者:王传剑, 黄诗敬, 王居正, 来源:武汉科技大学学报(社会科学版 年份:2022
自双边关系正常化以来,美国和越南之间的安全合作逐步启动并不断发展,特别是在特朗普政府时期,两国在安全领域的合作取得了一些显著进展,且表现出持续强化的势头。在"印太战略"加快实施的背景下,对中国崛起的共同关切以及在南海争端当中的利益契合,是推动美越两国加强安全合作的根本动因。双方安全关系的强化将对南海地区形势和地缘政治格局产生重大冲击,进而影响到中国的周边外交环境和对外政策选择。...
[期刊论文] 作者:王君彦, 龙素英, 来源:经营与管理 年份:2022
EVA重视企业的长远发展,不仅关注企业现时的价值创造能力,更注重对企业未来收益的预测,这种特性与独角兽企业高成长、潜在获利价值高的特点十分契合。以在我国独角兽企业中具有代表性的宁德时代作为研究案例,运用EVA二阶段增长模型评估其企业价值,印证了运用EVA对独角兽企业的价值评估具有一定的适用性和可行性,为独角兽企业的价值管理和投资者的长期风险管理决策提供借鉴。...
[期刊论文] 作者:袁嘉尧,林燕平,林贤灿,黄佳纯,陈桐莹,林适,连晓航,万雷,黄宏兴, 来源:中国组织工程研究 年份:2022
背景:骨质疏松症容易导致中老年人自理能力下降、死亡率和相关医疗费用增加,人体内主要体成分脂肪、肌肉和骨骼的关系并未阐明,因此需要研究它们的关系,并确定患者患骨质疏松症的潜在预测因子。目的:测量中老年人体成分和骨密度相关指标,并分析之间的关系。方法:纳入109例中老年人受试者,记录身高、体质量等信息,通过双能X射线骨密度仪测定骨密度及体成分。根据骨密度结果将受试者分为骨质疏松组及非骨质疏松组,分析两...
[期刊论文] 作者:陈美琳,张碧红,胡孟娇,段柳,王珺,张英博, 来源:中国麻风皮肤病杂志 年份:2022
目的:评价单纯挂线治疗Ⅰ~Ⅲ期甲沟炎的临床疗效。方法:回顾性分析我科2017年8月至2019年8月107例(134处)Ⅰ~Ⅲ期甲沟炎用单纯挂线治疗的临床疗效。结果:单纯挂线治疗Ⅰ~Ⅲ期甲沟炎能在短期内缓解疼痛,术后第1天、第3天、第7天的疼痛缓解率分别为80.60%、97.01%和100%。缝线脱落时间49~81天,平均65天。总治愈甲沟炎132处,治愈率达98.51%,复发4处,复发率3.03%...
[期刊论文] 作者:刘星妤,胡小芳,徐广立,王瑞,李佩瑶,王梦园,彭丽,朱香颖, 来源:中国组织工程研究 年份:2022
背景:人脐带间充质干细胞具有分化能力强、免疫调节作用强等特点,在细胞治疗方面受到广泛关注。目的:总结人脐带间充质干细胞治疗子宫内膜损伤相关疾病的研究进展。方法:以"人脐带间充质干细胞、子宫内膜、子宫内膜异位症、宫腔粘连、薄型子宫内膜"为中文检索词,以"human umbilical cord mesenchymalstemcells,endometrium,endometriosis,intrau...
[期刊论文] 作者:俞琳,潘辉,洪开听,占焕平,陈萍,王烨凯, 来源:中国妇幼保健 年份:2022
目的探讨外周血血小板计数(PLT)、血小板分布宽度(PDW)、血小板平均体积(MPV)及Th1/Th2细胞比值与支气管哮喘合并感染患儿病情变化的关系。方法选取2017年1月—2018年5月该院确诊的140例支气管哮喘患儿为研究对象,其中66例合并感染(感染组),74例为单纯的支气管哮喘患儿(哮喘组)。对比两组患儿的外周血PLT、PDW、MPV、Th1/Th2水平;并分析感染组在治疗前后上述指标的变...
[期刊论文] 作者:朱晓娟, 宋璇, 来源:中国质量万里行 年份:2022
新冠疫情自2020年1月以来肆虐全球,我国各级各地政府纷纷启动应急响应机制、积极采取各类疫情防控措施,为我国疫情快速得到控制做出了巨大贡献,但同时疫情防控应急措施也带来了合同履行的障碍。本文将通过典型案例及相关学理分析,...
[期刊论文] 作者:章鑫隆, 慈文韬, 罗开文, 闫石, 来源:中国组织工程研究 年份:2022
背景:股骨近端防旋髓内钉在治疗股骨转子间骨折方面优势显著,但仍有3.35%-31.08%的内固定失效率发生,且类型多样,原因复杂,因此,对股骨近端防旋髓内钉各类内固定失效的原因进行总结分析,同时明确长钉与短钉选择的分界以及术后内固定失效后的再手术策略,是临床更好针对性预防相应的内固定失效以及后续治疗的关键。目的:探讨应用股骨近端防旋髓内钉治疗股骨转子间骨折术后发生各类内固定失效的原因和再手术策略。...
相关搜索: