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交直流电力集成技术

马伟明

《中国工程科学》 2002年 第4卷 第12期   页码 53-59

摘要: 查明了发电机整流系统特有的低频功率振荡的机理,得出了稳定判据及解决稳定问题的技术措施;通过合理设计,可控制直流电压的浮动范围;综合治理整流过程引起的交流谐波和直流脉动,提高了系统的EMC性能;巧妙地处理了系统的强非线性,从而得出了直流短路和交直流同时短路的冲击电流解析式;提出了根据整流装置输入、输出电压波形进行实时在线故障诊断的原理和方法。在此基础上,将定子3绕组、12绕组、整流装置、励磁系统、励磁调节器等集于一体,功研制出性能优良的交直流发电机,能同时提供高品质交直流电源,为独立电力系统的集成化奠定了基础。

关键词: 电力集成     双绕组交直流发电机     12整流     交直流同时供电     独立电力系统    

微波无线能量收集技术——统一模型、自动化整流天线设计及前沿技术 Review

Si-Ping Gao, Jun-Hui Ou, Xiuyin Zhang, Yongxin Guo

《工程(英文)》 2023年 第30卷 第11期   页码 32-48 doi: 10.1016/j.eng.2023.05.019

摘要:

While sufficient review articles exist on inductive short-range wireless power transfer (WPT), long-haul microwave WPT (MWPT) for solar power satellites, and ambient microwave wireless energy harvesting (MWEH) in urban areas, few studies focus on the fundamental modeling and related design automation of receiver systems. This article reviews the development of MWPT and MWEH receivers, with a focus on rectenna design automation. A novel rectifier model capable of accurately modeling the rectification process under both high and low input power is presented. The model reveals the theoretical boundary of radio frequency-to-direct current (dc) power conversion efficiency and, most importantly, enables an automated system design. The automated rectenna design flow is sequential, with the minimal engagement of iterative optimization. It covers the design automation of every module (i.e., rectifiers, matching circuits,   antennae, and dc–dc converters). Scaling-up of the technique to large rectenna arrays is also possible, where the challenges in array partitioning and power combining are briefly discussed. In addition, several cutting-edge rectenna techniques for MWPT and MWEH are reviewed, including the dynamic range extension technique, the harmonics-based retro-directive technique, and the simultaneous wireless information and power transfer technique, which can be good complements to the presented automated design methodology.

关键词: 微波无线能量传输     微波无线能量收集     统一整流器模型     自动化整流天线设计     新兴整流天线技术    

Advances of 12th CAPS research symposium: young chemists and chemical engineers fronts

Guoping Hu, Baiqian Dai

《化学科学与工程前沿(英文)》 2021年 第15卷 第3期   页码 461-463 doi: 10.1007/s11705-020-2026-6

Introduction to the special section on the 12

Zhen-Min CHENG

《化学科学与工程前沿(英文)》 2009年 第3卷 第1期   页码 1-1 doi: 10.1007/s11705-009-0003-1

ThMn12型永磁合金 Review

G.C. Hadjipanayis, A.M. Gabay, A.M. Schönhöbel, A. Martín-Cid, J.M. Barandiaran, D. Niarchos

《工程(英文)》 2020年 第6卷 第2期   页码 140-146 doi: 10.1016/j.eng.2018.12.011

摘要:

具有四方ThMn12型结构的富铁化合物有潜力满足当下人们对于高磁能积、工作温度为150~200 ℃的贫稀土永磁体的需求。人们发现,引入镧(La)可以提高Sm(Fe,Ti)12中少数低熔点的稳定性,从而首次使得液烧结成为可能。然而,La金属的高反应活性会明显地破坏材料的矫顽力(Hc)。最初被抑制的ThMn12的可控结晶使得“块状”磁硬化成为可能,这不仅在Sm-Fe-V合金中可以实现(自20世纪90年代便为人所知),并且在添加La的(Ce,Sm)(Fe,Ti)12合金中也可以实现。机械化学合成的(Sm,Zr)(Fe,Si)12和(Sm,Zr)(Fe,Co,Ti)12粉末可能适合烧结成具有高强度的全致密磁体,尽管在此之前,两者都已开发出较高的各向异性

关键词: 永磁体,稀土永磁体,ThMn 12 结构    

Growth suppression of colorectal cancer expressing S492R EGFR by monoclonal antibody CH12

Qiongna Dong, Bizhi Shi, Min Zhou, Huiping Gao, Xiaoying Luo, Zonghai Li, Hua Jiang

《医学前沿(英文)》 2019年 第13卷 第1期   页码 83-93 doi: 10.1007/s11684-019-0682-z

摘要:

Colorectal cancer (CRC) is a common malignant tumor in the digestive tract, and 30%–85% of CRCs express epidermal growth factor receptors (EGFRs). Recently, treatments using cetuximab, also named C225, an anti-EGFR monoclonal antibody, for CRC have been demonstrated to cause an S492R mutation in EGFR. However, little is known about the biological function of S492R EGFR. Therefore, we attempted to elucidate its biological function in CRC cells and explore new treatment strategies for this mutant form. Our study indicated that EGFR and S492R EGFR accelerate the growth of CRC cells in vitro and in vivo and monoclonal antibody CH12, which specifically recognizes an EGFR tumor-specific epitope, can bind efficiently to S492R EGFR. Furthermore, mAb CH12 showed significantly stronger growth suppression activities and induced a more potent antibody-dependent cellular cytotoxicity effect on CRC cells bearing S492R EGFR than mAb C225. mAb CH12 obviously suppressed the growth of CRC xenografts with S492R EGFR mutations in vivo. Thus, mAb CH12 may be a promising therapeutic agent in treating patients with CRC bearing an S492R EGFR mutation.

关键词: S492R EGFR ectodomain mutation     colorectal cancer     mAb CH12     immunnotherapy    

外加电场气法制备纳米无机氧化物

庄清平

《中国工程科学》 2007年 第9卷 第2期   页码 74-78

摘要:

燃烧法纳米无机氧化物粉体特征一方面取决于前驱体的水解反应速度和粒子的成核生长动力学, 另一方面受到燃烧反应器内物料的流动混合、热质传递等多种过程因素的影响电场控制气燃烧法制备纳米 无机氧化物是在原有的基础上外加电场,使火焰的轴向高度降低、径向宽度增大,形成厚度相对均匀的火焰层, 火焰温度梯度也随之增大,抑制粒子表面的生长和粒子之间的烧结,获得&ldquo

关键词: 燃烧法     电场控制     火焰     纳米粒子     聚集体    

我国半导体硅片发展现状与展望

张果虎,肖清华,马飞

《中国工程科学》 2023年 第25卷 第1期   页码 68-78 doi: 10.15302/J-SSCAE-2023.01.002

摘要: 本文重点围绕市场主流的8 in、12 in硅片,分析了全球半导体硅片的技术和产业发展现状,研判了全球半导体硅片产业未来的发展趋势,重点分析了我国半导体硅片的发展现状,指出我国半导体硅片在当前市场需求、宏观政策

关键词: 半导体硅片;8 in;12 in;产业协同;先进制程    

Facile controlled synthesis of hierarchically structured mesoporous Li4Ti5O12/C/rGO composites as high-performance

Cehuang FU, Shuiyun SHEN, Ruofei WU, Xiaohui YAN, Guofeng XIA, Junliang ZHANG

《能源前沿(英文)》 2022年 第16卷 第4期   页码 607-612 doi: 10.1007/s11708-021-0798-0

摘要: In this paper, a facile strategy is proposed to controllably synthesize mesoporous Li4Ti5O12/C nanocomposite embedded in graphene matrix as lithium-ion battery anode via the co-assembly of Li4Ti5O12 (LTO) precursor, GO, and phenolic resin. The obtained composites, which consists of a LTO core, a phenolic-resin-based carbon shell, and a porous frame constructed by rGO, can be denoted as LTO/C/rGO and presents a hierarchical structure. Owing to the advantages of the hierarchical structure, including a high surface area and a high electric conductivity, the mesoporous LTO/C/rGO composite exhibits a greatly improved rate capability as the anode material in contrast to the conventional LTO electrode.

关键词: Li4Ti5O12     phenolic-resin-based carbon     mesoporous composite     graphene    

Poor adherence to P2Y12 antagonists increased cardiovascular risks in Chinese PCI-treated patients

null

《医学前沿(英文)》 2017年 第11卷 第1期   页码 53-61 doi: 10.1007/s11684-017-0502-2

摘要:

Low adherence to secondary prevention medications (ATM) of patients after acute coronary syndrome (ACS) is associated with poor clinical outcomes. However, literature provides limited data on assessment of ATM and risks associated with poor in Chinese patients with ACS. In the current work, ATM was assessed in consecutively recruited patients with ACS in Tongji Hospital from November 5, 2013 to December 31, 2014. A total of 2126 patients were classified under low adherence (proportion of days covered (PDC)<50%) and high adherence (PDC>50%) groups based on their performance after discharge. All patients were followed up at the 1st, 6th, and 12th month of discharge while recording ATM and major adverse cardiac events (MACE). Bivariate logistic regression was used to identify the factors associated with ATM. Cox regression was used to analyze the association between ATM and MACE within one year after discharge. Results showed that coronary artery bypass grafting (CABG) alone had significantly lower proportion of high adherence to P2Y12 antagonists (83.0% vs. 90.7%, P<0.01) than patients treated with percutaneous coronary intervention (PCI) only. Moreover, in patients undergoing PCI, high adherence to P2Y12 antagonists decreased the risk of MACE (hazard ratio=0.172, 95% confidence interval: 0.039–0.763; P=0.021). In conclusion, PCI-treated patients are more prone to remaining adherent to medications than CABG-treated patients. High adherence to P2Y12 antagonists was associated with lower risk of MACE.

关键词: acute coronary syndromes     adherence to secondary prevention medications     clinical outcome    

聚焦两界面

沈平

《工程(英文)》 2021年 第7卷 第5期   页码 552-553 doi: 10.1016/j.eng.2021.02.003

利用基因组特异性引物和Cas12a介导技术快速检测稻瘟菌小麦致病型 Article

康厚祥, 彭烨, Kangyu Hua, 邓雨飞, Maria Bellizzi, Dipali Rani Gupta, Nur Uddin Mahmud, Alfredo S. Urashima, Sanjoy Kumar Paul, Gary Peterson, 周益林, 周雪平, Md Tofazzal Islam, 王国梁

《工程(英文)》 2021年 第7卷 第9期   页码 1326-1335 doi: 10.1016/j.eng.2020.07.016

摘要: 随后,我们使用Cas12a 蛋白及导向RNA(gRNA)靶向MoT-6098MoT-6099 序列,两个靶标被识别后,均能激活Cas12a 非特异切割单链脱氧核糖核酸酶(ssDNAase)的活性,我们将依赖靶向Cas12a 激活ssDNase 活性,同时将重组酶聚合酶扩增(RPA)和核酸侧流免疫分析法(NALFIA)相结合,开发出一种准确、灵敏且经济高效地检测受感染小麦植株中

关键词: 麦瘟病     稻瘟菌小麦致病型     Cas12a     核酸侧流免疫分析     田间检测    

石墨氮化碳负载杂多酸——水相中高效光氧化苯甲醇 Article

吴立夫, 安赛, 宋宇飞

《工程(英文)》 2021年 第7卷 第1期   页码 94-102 doi: 10.1016/j.eng.2020.07.025

摘要: 在本文中,我们通过在磷酸功能化的石墨氮化碳(g-C3N4)纳米片上负载磷钨酸成功制备了新型光催化剂(PW12-P-UCNS,其中,PW12为H3PW12O40·xH2O,P-UCNS为磷酸修饰的超薄石墨氮化碳选取水相中苯甲醇光氧化制备苯甲醛的反应为模型反应,在室温条件下,对PW12-P-UCNS的催化性能进行了系统探究。所制备的PW12-P-UCNS光催化剂在2 h内的转化率为58.3%,选择性为99.5%,可重复使用5次以上,且活性未发生明显损失。基于此,所设计的PW12-P-UCNS光催化剂对于在温和条件下通过水光氧化反应生产苯甲醛具有广阔的应用前景。

关键词: 光催化     杂多酸     石墨氮化碳     苯甲醛    

用于无线供电物联网感知的电小尺寸惠更斯整流天线综述 Review

蔺炜, Richard W. Ziolkowski

《工程(英文)》 2022年 第11卷 第4期   页码 42-59 doi: 10.1016/j.eng.2021.08.025

摘要: 整流天线是整流电路和天线的组合,是远场WPT系统中最关键的组件。然而,紧凑型应用设备需要更小的集成整流天线,这些天线要同时具有大的电磁波捕获能力、高交流(AC)到直流(DC)转换效率,及促进多功能无线性能的作用。本文综述了各种整流天线的小型化技术,如曲折平面倒F天线(PIFA)整流天线、小型化的基于单极和偶极的整流天线、分形环和贴片整流天线、介质负载整流天线和电小尺寸近场谐振寄生整流天线。文中总结了它们的性能特征,并与我们之前开发的被证明更适合IoT 应用的电小尺寸惠更斯整流天线进行比较。例如,如本文所演示,它们经过定制可以成为无电池IoT 传感器。本文介绍了一系列高性能电小型惠更斯整流天线,包括惠更斯线极化(HLP)和圆极化(HCP)整流天线、基于这些设计的无线供电IoT 传感器以及双功能HLP整流天线和天线系统。

关键词: Antenna     Array     Cardioid pattern     Electrically small antenna     Huygens dipole antenna     Internet of Things (IoT)     Rectenna     Rectifier circuit     Wireless power transfer    

Function of Slit/Robo signaling in breast cancer

null

《医学前沿(英文)》 2015年 第9卷 第4期   页码 431-436 doi: 10.1007/s11684-015-0416-9

摘要:

Slit and Robo are considered tumor suppressors because they are frequently inactivated in various tumor tissue. These genes are closely correlated with CpG hypermethylation in their promoters. The Slit/Robo signaling pathway is reportedly involved in breast cancer development and metastasis. Overexpression of Slit/Robo induces its tumor suppressive effects possibly by inactivating the β-catenin/LEF/TCF and PI3K/Akt signaling pathways or by altering β-catenin/E-cadherin-mediated cell-cell adhesion in breast cancer cells. Furthermore, loss of Slit proteins or their Robo receptors upregulates the CXCL12/CXCR4 signaling axis in human breast carcinoma. In addition, this pathway regulates the distant migration of breast cancer cells not only by mediating the phosphorylation of the downstream molecules of CXCL12/CXCR4 and srGAPs, such as PI3K/Src, RAFTK/ Pyk2, and CDC42, but also by regulating the activities of MAP kinases. This review includes recent studies on the functions of Slit/Robo signaling in breast cancer and its molecular mechanisms.

关键词: Slit/Robo     hypermethylation     β-catenin     CXCL12/CXCR4     migration    

标题 作者 时间 类型 操作

交直流电力集成技术

马伟明

期刊论文

微波无线能量收集技术——统一模型、自动化整流天线设计及前沿技术

Si-Ping Gao, Jun-Hui Ou, Xiuyin Zhang, Yongxin Guo

期刊论文

Advances of 12th CAPS research symposium: young chemists and chemical engineers fronts

Guoping Hu, Baiqian Dai

期刊论文

Introduction to the special section on the 12

Zhen-Min CHENG

期刊论文

ThMn12型永磁合金

G.C. Hadjipanayis, A.M. Gabay, A.M. Schönhöbel, A. Martín-Cid, J.M. Barandiaran, D. Niarchos

期刊论文

Growth suppression of colorectal cancer expressing S492R EGFR by monoclonal antibody CH12

Qiongna Dong, Bizhi Shi, Min Zhou, Huiping Gao, Xiaoying Luo, Zonghai Li, Hua Jiang

期刊论文

外加电场气法制备纳米无机氧化物

庄清平

期刊论文

我国半导体硅片发展现状与展望

张果虎,肖清华,马飞

期刊论文

Facile controlled synthesis of hierarchically structured mesoporous Li4Ti5O12/C/rGO composites as high-performance

Cehuang FU, Shuiyun SHEN, Ruofei WU, Xiaohui YAN, Guofeng XIA, Junliang ZHANG

期刊论文

Poor adherence to P2Y12 antagonists increased cardiovascular risks in Chinese PCI-treated patients

null

期刊论文

聚焦两界面

沈平

期刊论文

利用基因组特异性引物和Cas12a介导技术快速检测稻瘟菌小麦致病型

康厚祥, 彭烨, Kangyu Hua, 邓雨飞, Maria Bellizzi, Dipali Rani Gupta, Nur Uddin Mahmud, Alfredo S. Urashima, Sanjoy Kumar Paul, Gary Peterson, 周益林, 周雪平, Md Tofazzal Islam, 王国梁

期刊论文

石墨氮化碳负载杂多酸——水相中高效光氧化苯甲醇

吴立夫, 安赛, 宋宇飞

期刊论文

用于无线供电物联网感知的电小尺寸惠更斯整流天线综述

蔺炜, Richard W. Ziolkowski

期刊论文

Function of Slit/Robo signaling in breast cancer

null

期刊论文