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Molecular ferroelectrics for efficient perovskite solar cells

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Science China Chemistry 2021年第2期64卷 169-170页

作者： chun-hua Yan Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsPKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China College of Chemistry and Chemical Engineering Lanzhou UniversityLanzhou 730000China

During the past decade,the power conversion efficiencies(PCEs)of organic-inorganic hybrid perovskite solar cells(PSCs)have exceeded 25%[1],which is expected to be one of the candidates for the next generation of thin-film photovoltaic *** speaking,the performance of PSCs mainly depends on the light absorption capacity,defect passivation and photo-induced exciton separation and extraction of perovskite *** the light illumination,photo-induced excitons were separated and extracted by the built-in electric field of PSCs.

关键词： perovskite illumination inorganic

切向入流旋流竖井在深圳市前海-南山排水深层隧道中的应用研究

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中国农村水利水电 2024年第2期 74-82,90页

作者：黄春华邢方亮王斌珠江水利委员会珠江水利科学研究院广东广州510611 珠江水利委员会广东广州510611

为探究切向入流旋流竖井的水力特性,采用物理模型手段,结合深圳市前海-南山排水深层隧道中郑宝坑渠旋流竖井方案,研究旋流竖井内的水流流态、消能特性、排气效果及特征压力值。结果表明:各工况下进口位置处水流逐渐形成水翅,进入竖井后... 详细信息

为探究切向入流旋流竖井的水力特性,采用物理模型手段,结合深圳市前海-南山排水深层隧道中郑宝坑渠旋流竖井方案,研究旋流竖井内的水流流态、消能特性、排气效果及特征压力值。结果表明:各工况下进口位置处水流逐渐形成水翅,进入竖井后沿内壁形成螺旋跌落流,水流流态较好,当竖井流量极小时竖井内无法形成螺旋跌落流,水流进入竖井后呈射流形态跌落至竖井底部;旋流竖井总消能率在81.9%~89.5%之间,消能率随着流量的增大而逐步减小;旋流竖井相对于传统水工旋流竖井,具有消能效果好、结构简单等优点,在城市深层排水系统中具有较大的应用空间。

关键词：切向入口旋流竖井深层隧道消能率

婴幼儿护肤品中违禁激素丙酸氯倍他索的荧光渐变型比色分析

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光谱学与光谱分析 2024年第6期44卷 1636-1639页

作者：许春华张惠煊孙毓唐楷臻徐银娟赵媛江南大学化学与材料工程学院合成与生物胶体教育部重点实验室江苏无锡214122

丙酸氯倍他索(CP)是一种糖皮质激素,可用于治疗湿疹、银屑病等皮肤病。婴幼儿长期频繁使用含CP的护肤品可能会导致严重的健康隐患。CP属化妆品禁添加组分,急需开发一种快速、简单护肤品中违禁激素CP的检测方法。通过橙色发光全无机钙钛... 详细信息

丙酸氯倍他索(CP)是一种糖皮质激素,可用于治疗湿疹、银屑病等皮肤病。婴幼儿长期频繁使用含CP的护肤品可能会导致严重的健康隐患。CP属化妆品禁添加组分,急需开发一种快速、简单护肤品中违禁激素CP的检测方法。通过橙色发光全无机钙钛矿量子点(CsPbBr 1.5 I 1.5 QDs)和CP之间发生的卤素交换反应,荧光信号发生蓝移,偏移波长与CP浓度之间呈良好的线性关系,实现婴幼儿护肤品中CP含量的快速检测,检出限为0.2 mmol·L^(-1),检测时间为10 min。开发了用于婴幼儿护肤品中CP检测的荧光比色卡,可快速、准确、简便地用于婴幼儿护肤品中CP含量的检测。

关键词：荧光光谱婴幼儿护肤品丙酸氯倍他索全无机钙钛矿量子点荧光比色分析

Clinical characteristics and analysis of vestibular-evoked myogenic potentials in patients with sudden sensorineural hearing loss in different ages

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World Journal of Clinical Cases 2024年第19期12卷 3760-3766页

作者： Yan-Zhuo Zhang Ya-Bo Wang Jing-Lei Fang Yue-Tang Wang Gui-Fang Li Ran-Ran Liu Shu-Jing Shi chun-hua Wang Yong-Tao Tian Department of Otolaryngology Hebei Provincial Eye HospitalHebei Provincial Key Laboratory of OphthalmologyHebei Provincial Eye InstituteXingtai 054001Hebei ProvinceChina

BACKGROUND Numerous studies have found that patients experiencing sudden sensorineural hearing loss(SSHL),with or without accompanying vertigo,often show impaired vestibular ***,there is a dearth of studies analyzing vestibularevoked myogenic potentials(VEMPs)in SSHL patients across various age *** To investigate vestibular condition in SSHL patients across various age *** Clinical data of 84 SSHL patients were investigated ***,cervical vestibular evoked myogenic potentials(c-VEMPs),and ocular vestibular evoked myogenic potentials(o-VEMPs)were conducted on these *** assessed included the latencies of P1 and N1 waves,as well as the amplitudes of P1–N1 ***,the study evaluated the influence of factors such as sex,affected side,configuration of hearing loss,and presence of accompanying *** Among the 84 SSHL patients,no significant differences were observed among the three groups in terms of gender,affected side,and the presence or absence of *** II(aged 41–60 years)had the highest number of SSHL *** rates of absent o-VEMPs in the affected ears were 20.83%,31.58%,and 22.72%for the three age groups,respectively,with no statistically significant difference among *** rates of absent c-VEMPs in the affected ears were 8.3%,34.21%,and 18.18%for the three age groups,respectively,with significant *** the unaffected ears,there were differences observed in the extraction rates of o-VEMPs in the unaffected ears among the age *** the three age groups,no significant differences were noted in the three age groups in the latencies of P1 and N1 waves or in the amplitude of N1–P1 waves for c-VEMPs and o-VEMPs,either on the affected side or on the unaffected side,across the three age *** The extraction rate of VEMPs is more valuable than *** of the presence of vertigo,vestibular organs are involved in ***,SSHL pat

关键词： Sudden sensorineural hearing loss Cervical vestibular evoked myogenic potential Ocular vestibular evoked myogenic potential Vertigo Pure tone audiometry

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国家经济安全发展的知识结构与演化路径研究

技术经济与管理研究 2024年第2期 11-17页

作者：张春华侯冠宇王乾坤中国政法大学商学院北京100088 东北大学马克思主义学院河北秦皇岛066004

经济安全是国家安全体系的重要组成部分,是国家安全的基础。运用文献计量学方法对我国经济安全发展的知识结构与演化路径进行分析。研究发现,国内关于国家经济安全的研究经历了由浅入深、由点到面、由理论到实践的纵深发展。已有研究缺... 详细信息

经济安全是国家安全体系的重要组成部分,是国家安全的基础。运用文献计量学方法对我国经济安全发展的知识结构与演化路径进行分析。研究发现,国内关于国家经济安全的研究经历了由浅入深、由点到面、由理论到实践的纵深发展。已有研究缺乏对国家经济安全的战略研究且研究成果的应用性不足。在未来,需进一步从国际关系与国家经济安全、国家经济安全的内涵及其关联问题、研究范式的创新与更迭、国际关系与中国经济发展等方面展开深入研究。

关键词：经济安全经济高质量发展中国式现代化文献计量

Global Solvability,Pattern Formation and Stability to a Chemotaxis-haptotaxis Model with Porous Medium Diffusion

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Acta Mathematica Sinica,English Series 2023年第8期39卷 1597-1623页

作者： chun hua JIN School of Mathematical Sciences South China Normal UniversityGuangzhou 510631P.R.China

In this paper,we deal with the following chemotaxis-haptotaxis system modeling cancer invasion with nonlinear diffusion,ut=Δum−χ∇·(u∇v)−ξ∇·(u∇ω)+μu(1−u−ω),inΩ×R^(+),vt−Δv+v=u,inΩ×R+,ωt=−vω,inΩ×R+,whereΩ⊂R^(N)is a bounded *** first supplement the results of global existence and uniform boundedness of solutions for the case m=2N N+*** for any m>0 and any spatial dimension,we consider the stability of equilibrium,and find that the chemotaxis has a destabilizing effect,that is for the ODEs,or the diffusion-ODE system without chemotaxis,the solutions tend to a linearly stable uniform steady state(1,1,0).When the chemotactic coefficientχis large,the equilibrium(1,1,0)become *** we study the existence of nontrivial stationary solutions via bifurcation techniques withχbeing the bifurcation parameter,and obtain nonhomogeneous *** last,we also investigate the stability of these bifurcation solutions.

关键词： Chemotaxis-haptotaxis porous medium diffusion pattern formation stability

智慧园区设计理念的实践与创新——以临港国际文化创意园项目为例

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智能建筑与智慧城市 2024年第10期 134-136页

作者：黄春华艾奕康设计与咨询(深圳)有限公司上海分公司

作为智慧园区的典范,临港国际文化创意园项目集成了绿色建筑、智能技术、地下空间开发和BIM技术等前沿理念。文章通过深入分析项目的规划设计与管理,揭示了如何实现智慧园区的愿景,并为未来复合园区的发展提供借鉴。

关键词：智慧园区 BIM技术可持续发展智能技术

Self-expanding metal stent for relieving the stricture after endoscopic injection for esophageal varices

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World Journal of Clinical Cases 2024年第28期12卷 6180-6186页

作者： Fu-Long Zhang Jing Xu Yu-Hong Jiang Yuan-Dong Zhu Yan Shi Xiao Li Hai Wang Chao-Jun huang chun-hua Zhou Qun Zhu Jing-Wen Chen Department of Gastroenterology Hangzhou Xixi HospitalHangzhou 310023Zhejiang ProvinceChina

BACKGROUND Esophageal stricture is one of the complications after esophageal varices sclero-therapy injection(ESI),and the incidence rate is between 2%-10%.AIM To explore the efficacy of self-expanding metal stent(SEMS)for the stricture after endoscopic injection with cyanoacrylate(CYA)and sclerotherapy for esophageal *** We retrospectively analyzed the efficacy of SEMS to improve the stricture after endoscopic injection with CYA and sclerotherapy for esophageal varices in 4 patients from February 2023 to June *** The strictures were improved in four patients after *** stent was removed after two weeks because of chest pain with embedding into esophageal mucosa in one *** stent was removed after one month,however,the stent was reinserted because of the strictures happening again in two *** stent was removed after three months,however,the stent was reinserted because of the strictures happening again in one *** stent embedded into esophageal mucosa in three *** were 3 patients suffered reflux esophagitis,and the acid reflux was relieved by taking *** was no other complication of esophageal perforation,bleeding from varices or *** SEMS may relieve the stricture which happened after endoscopic injection with CYA and sclerotherapy for esophageal ***,when we should remove the stent still needs to be explored.

关键词： Stent Stricture Endoscopic injection Esophageal varices cyanoacrylate Sclerotherapy

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市政公用工程道路路基施工技术实践应用研究