检索结果-南通市图书馆

Experimental investigation on turbulence modification in a horizontal channel flow at relatively low mass loading

Acta Mechanica Sinica 2006年第2期22卷 99-108页

作者： Yi Wu Hangfeng Wang Zhaohui liu Jing li liqi Zhang Chuguang Zheng State Key Lab. Coal Combustion Huazhong Univ. of Sci. & Tech.Wuhan 430074 China

Particle-laden flows in a horizontal channel were investigated by means of a two-phase particle image velocimetry （PIV） technique. Experiments were performed at a Reynolds number of 6826 and the flow is seeded with polythene beads of two sizes, 60μm and 110μm. One was slightly smaller than and the other was larger than the Kolmogorov length scale. The particle loadings were relatively low, with mass loading ratio ranging from 5 ×10^-4 to 4 × 10^-2 and volume fractions from 6×10×-7 to 4.8×10^-5, respectively. The results show that the presence of particles can dramatically modify the turbulence even under the lowest mass loading ratio of 5 × 10^-4. The mean flow is attenuated and de- creased with increasing particle size and mass loading. The turbulence intensities are enhanced in all the cases concerned. With the increase of the mass loading, the intensities vary in a complicated manner in the case of small particles, indicating complicated particle-turbulence interactions; whereas they increase monotonously in the case of large particles. The particle velocities and concentrations are also given. The particles lag behind the fluid in the center region but lead in the wall region, and this trend is more prominent for the large particles. The streamwise particle fluctuations are larger than the gas fluctuations for both sizes of particles, however their varying trend with the mass loadings is not so clear. The wallnormal fluctuations increase with increasing mass loadings. They are smaller in the 60μm particle case but larger in the 110μm particle case than those of the gas phase. It seems that the small particles follow the fluid motion to certain extent while the larger particles are more likely dominated by their own inertia. Finally, remarkable non-uniform distributions of particle concentration are observed, especially for the large particles. The inertia of particles is proved to be very important for the turbulence modification and particles behaviors and thus

关键词： Horizontal channel Particle-laden flow Turbulence modification PIV

来源：

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

New approach to paricalcitol synthesis

引用

Chinese Science Bulletin 2012年第14期57卷 1616-1619页

作者： li liqi YUE liRong XIE ZhiXiang li Ying State Key Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou 730000 China

Paricalcitol,an analog of vitamin D,is used as a drug for the prevention and treatment of secondary *** this paper,a new strategy for the synthesis of paricalcitol is *** approach includes three main improvements:one-pot regioselective ozonization cleavage of the side-chain and methylene at C-19,free-radical reduction removal of the OH group formed at C-19,and side-chain assembly using a Wittig *** are all new strategies for the synthesis of 19-nor-vitamin D2 compounds.

关键词：醇合成维生素D2 清除自由基反应选择性甲状旁腺继发性亚甲基化合物

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Evaluation of 118 Thyroid Cancer Patients Who Underwent a Re-operation after Local Resection

引用

Chinese Journal of Clinical Oncology 2005年第5期2卷 800-804页

作者： Jianping Hang Dong Meng liqi li Department of Thyroid and Breast Surgery Wuxi No. 4 Hospital WuxiJiangsu 214062 China.

OBJECTIVE To evaluate the incidence of residual thyroid cancer and cervical lymph node metastasis following a previous local resection for thyroid cancer, and to discuss methods of a reoperation. METHODS From 1994-2005, 118 patients with thyroid cancer who had previously been treated with a nodule-resection or subtotal Iobectomy in other hospitals underwent a surgical re-operation. RESULTS The incidence of residual cancer at the primary site was 38.1%. The lymph node metastasis rate at the central area was 39.8%. The rate of lymph node metastasis in patients with enlarged lymph nodes in the ipsilateral internal jugular chain was 37.5%, The rate of laryngeal recurrent nerve injury was 15.2% in other hospitals while that of the second operation in our hospital was 1.6%. CONCLUSION Nodule-resection or subtotal Iobectomy alone is not indicated for patients with thyroid cancer because of the high rate of local residual cancer. It is important to be familiar with the anatomy of the laryngeal recurrent nerve for thyroid surgery. Exploration to the central area is necessary for differentiated thyroid cancer.

关键词： thyroid neoplosm re-operotion.

来源：

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

Pathogenesis and Immunogenicity of an Avian H9N2 Influenza Virus Isolated from Human

引用

Biomedical and Environmental Sciences 2011年第5期24卷 530-536页

作者： liU liqi li Zi ZHOU JianFang ZHU Yun DONG Jie ZHAO Xiang GUO JunFeng SHU YueLong State Key Laboratory for Molecular Virology and Genetic Engineering Chinese National Influenza CenterNational Institute for Viral Disease Control and PreventionChina CDCBeijing 102206China

Objective To investigate the pathogenesis and immunogenicity of H9N2 influenza virus A/Guangzhou/333/99 （a reassortant of G1 and G9 viruses isolated from a female patient in 1999） in a mouse model of *** Mice were infected with increasing virus *** load in the lungs and trachea was determined by EID50 *** histopathology was assessed by hematoxylin‐eosin ***‐HI antibody titers and T‐cell responses to viral HA were determined by EliSPOT and confirmed by flow *** Mice presented a mild syndrome after intranasal infection with A/Guangzhou/333/99 （H9N2） influenza *** was detected in the trachea and lungs of mice harvested on days 3,6,and 9 post‐infection.A T‐cell response to viral HA was detected on day 6 and H9 HA‐specific CD 4＋ T‐cells *** was detected after 14 days and antibody persisted for at least 28 *** Our results suggest that H9N2 （A/Guangzhou/333/99） can replicate in the murine respiratory tract without prior adaptation,and both humoral and cell‐mediated immunity play an important role in the immune response.

关键词： Avian influenza H9N2 Pathogenic characteristics Host immune responses

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Atomistic Surface Passivation of CH_(3)NH_(3)PbI_(3) Perovskite Single Crystals for Highly Sensitive Coplanar-Structure X-Ray Detectors

引用

Research 2020年第1期2020卷 956-965页

作者： Yilong Song liqi li Weihui Bi Mingwei Hao Yifei Kang Anran Wang Zisheng Wang Hanming li Xiaohui li Yanjun Fang Deren Yang Qingfeng Dong State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China

Organic-inorganic halide perovskites(OIHPs)are recognized as the promising next-generation X-ray detection ***,the device performance is largely limited by the ion migration issue of ***,we reported a simple atomistic surface passivation strategy with methylammonium iodide(MAI)to remarkably increase the ion migration activation energy of CH_(3)NH_(3)PbI_(3)single *** amount of MAI deposited on the crystal surface is finely regulated by a self-assemble process to effectively suppress the metallic lead defects,while not introducing extra mobile ions,which results in significantly improved dark current stability of the coplanar-structure devices under a large electric field of 100Vmm^(-1).The X-ray detectors hence exhibit a record-high sensitivity above 700,000μC Gy^(-1)_(air) cm^(-2)under continuum X-ray irradiation with energy up to 50 keV,which enables an ultralow X-ray detection limit down to 1.5 nGy_(air)s^(-1).Our findings will allow for the dramatically reduced X-ray exposure of human bodies in medical imaging applications.

关键词： Highly planar hence

来源：

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

In-situ monitored chemical bath deposition of planar NiO x layer for inverted perovskite solar cell with enhanced efficiency

引用

Journal of Materials Science & Technology 2023年第2期133卷 145-153页

作者： liqi li Wenjian Shen Chenquan Yang Yuxi Dou Xuehao Zhu Yao Dong Juan Zhao Junyan Xiao Fuzhi Huang Yi-Bing Cheng Jie Zhong State Key Laboratory of Advanced Technology of Materials Composite Technology Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528216China School of Automobile Engineering Wuhan University of TechnologyWuhan 430070China School of Materials Science and Technology Wuhan University of TechnologyWuhan 430070China

As a convenient,low-cost and up-scalable solution route,chemical bath deposition(CBD)has exhibited impressive advantages in fabricating electron transporting materials like SnO_(2),achieving record efficien-cies for regular n-i-p perovskite solar cells(PSCs).However,for the hysteresis-free and potentially more stable inverted p-i-n PSCs,CBD processing is rarely studied to improve the device *** this work,we first present a CBD planar NiO x film as the efficient hole transport layer for the inverted per-ovskite solar cells(IPSCs).The morphologies and semiconducting properties of the NiO x film can be ad-justed by varying the concentration of[Ni(H 2 O)x(NH 3)6-x]2+cation via in-situ monitoring of the CBD re-action *** characterizations of ultraviolet photoelectron spectroscopy,transient absorption spec-troscopy,time-resolved photoluminescence suggest that the CBD planar NiO x film possesses enhanced conductivity and aligned energy band levels with perovskite,which benefits for the charge transport in the *** devices based on planar NiO x at 50°C and low nickel precursor concentration achieved an enhanced efficiency from 16.14%to 18.17%.This work established an efficient CBD route to fabricate planar NiO x film for PSCs and paved the way for high performance PSCs with CBD-prepared hole transporting materials.

关键词： Nickel oxide Perovskite solar cell Chemical bath deposition Planar NiO x film

来源：

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

Development of robust perovskite single crystal radiation detectors with high spectral resolution through synergetic trap deactivation and self-healing

引用

InfoMat 2023年第9期5卷 26-37页

作者： lixiang Wang Yilong Song liqi li liting Tao Minxing Yan Weihui Bi Xueying Yang Yuan Sun Qingfeng Dong Deren Yang Yanjun Fang State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang UniversityHangzhouthe People's Republic of China State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchunthe People's Republic of China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuanthe People's Republic of China

Organic-inorganic halide perovskite single crystals(SCs)are promising materials for detecting ionizing radiation owing to their outstanding photoelectric conversion capability and inexpensive solution ***,the accuracy and stability of the detectors have been limited due to the charge traps and defects in SCs,especially when operated under high-precision photon-counting mode for energy spectrum ***,we proposed a trap freezing deactivation route,which obviously suppressed dark current and noise by up to 97%and 92%,***,the bulk ion migration effect was essential for the ability to instantly self-heal defects induced by radiation damage at temperatures down to30***,the detector exhibits a record high energy resolution of 7.5%at 59.5 keV for 241Amγ-ray source,which is the best solution-processed semiconductor radiation detectors at the same energy *** addition,the detector maintains over 90%of its initial performance after 9 months of storage when tested in the *** results will represent a revision of the paradigm that high-spectral-resolution and robust radiation detectors can only be realized with high temperature grown inorganic semiconductor single crystals.

关键词： energy resolution perovskite single crystal photon counting radiation detector self-healing stability

来源：

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

118例甲状腺癌局部切除术后再手术探讨

引用

中国肿瘤临床 2006年第4期33卷 223-225页

作者：杭剑萍孟东李励琦苏州大学附四院无锡第四人民医院甲状腺乳腺肿瘤外科江苏省无锡市214062

目的:了解甲状腺癌行肿块切除或腺叶次全切除术后腺体残癌率和区域淋巴结转移的情况,明确甲状腺癌的切除范围与手术方式。方法:对1994年8月～2005年2月在院外行肿块局部切除后来我院行2次或2次以上手术的118例甲状腺癌进行分析。结果:... 详细信息

目的:了解甲状腺癌行肿块切除或腺叶次全切除术后腺体残癌率和区域淋巴结转移的情况,明确甲状腺癌的切除范围与手术方式。方法:对1994年8月～2005年2月在院外行肿块局部切除后来我院行2次或2次以上手术的118例甲状腺癌进行分析。结果:总癌残留率55.9%(66/118)。原发腺叶残癌率38.1%(45/118),对叶癌发现率7.6%(9/118),颈侧区淋巴结肿大的转移癌发生率为37.5%(21/56),患侧中央区淋巴结转移癌发生率为39.8%(47/118)。院外术后喉返神经损伤的发生率为15.2%(18/118),我院再次手术所致喉返神经损伤的发生率为1.6%(2/118)。结论:甲状腺癌行肿块切除或腺叶次全切除术后残癌率较高,此类术式应该废弃。甲状腺癌腺叶切除手术中应强调解剖喉返神经,可降低损伤发生率。临床颈淋巴结阴性患者,术中快速切片(FS)一经确诊分化型甲状腺癌,应常规行中央区淋巴结清扫术。

关键词：甲状腺癌再手术局部切除

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

“第六届中共党史研究青年学者论坛”综述

引用

中共党史研究 2023年第6期 153-154页

作者：李金操李丽琦北京师范大学文理学院北京师范大学历史学院

2023年10月14日至15日,由《中共党史研究》编辑部和北京师范大学历史学院共同主办的“第六届中共党史研究青年学者论坛”在北京师范大学珠海校区召开。来自国内多所高校和科研机构的专家学者,以及多家期刊的学术编辑共40余人与会。

关键词：中共党史研究科研机构北京师范大学《中共党史研究》第六届珠海校区专家学者

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

广州市黄埔区2021年大气污染特征分析

引用

云南化工 2022年第7期49卷 93-97页

作者：李莉琪广州市生态环境局黄埔环境监测站广东广州510670

通过收集广州市黄埔区2021年全年主要大气污染物的在线监测数据,总结了各主要大气污染物的年浓度水平、季节变化特征、日变化特征,并分析了形成原因。结果表明:广州市黄埔区2021年大区污染物以O_(3-8H)与NO_(2)为主,其中O_(3-8H)污染天... 详细信息

通过收集广州市黄埔区2021年全年主要大气污染物的在线监测数据,总结了各主要大气污染物的年浓度水平、季节变化特征、日变化特征,并分析了形成原因。结果表明:广州市黄埔区2021年大区污染物以O_(3-8H)与NO_(2)为主,其中O_(3-8H)污染天数较多,其次为NO_(2)。提出了大气污染防治的建议和解决方法。

关键词：空气污染大气污染大气污染特征

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：