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A betatron tune measurement system based on bunch-by-bunch transverse feedback at the Duke storage ring

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Chinese Physics C 2013年第7期37卷 76-82页

作者：徐卫 W. Z. Wu 李京祎何多慧 Y. K. Wu National Synchrotron Radiation Laboratory (NSRL) University of Science and Technology of China fel Laboratory TUNL and Department of Physics Duke University

To combat electron beam instabilities, a digital bunch-by-bunch transverse feedback （TFB） system has been developed for the Duke storage ring. While it is capable of suppressing transverse beam instabilities for multibunch operation, the TFB system has not been needed for typical operation of the Duke storage ring. To explore the great potential of this system, we have developed beam diagnostic techniques using the TFB, in particular, the TFB based tune measurement techniques. The tune measurement technique allows us to conduct fast chromaticity measurements, compared with the existing chromaticity measurement system using a network analyzer. This new tune measurement system also enables us to measure the bunch tune for multibunch operation of the Duke storage ring. With the TFB based tune measurement system, we have studied the tune stability of the electron beam in the Duke storage ring. This tune system has also been used to calibrate the tune knob for the Duke storage ring.

关键词： transverse feedback tune chromaticity

Compact and robust supercontinuum generation and post-compression using multiple thin plates

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High Power Laser Science and Engineering 2021年第4期9卷 234-241页

作者： Xinhua Xie Yunpei Deng Steven L.Johnson swiss fel Paul Scherrer Institute5232 Villi genSwitzerland Institute for Quantum Electronics Physics DepartmentETH ZurichETH Zurich8093 ZurichSwitzerland

We report on compact and robust supercontinuum generation and post-compression using transmission of light through multiple thin solid plates at the swiss fel X-ray free-electron laser facility.A single stage consisting of three thin plates followed by a chirped mirror compressor achieves compression of initially 30-fs pulses with 800-nm center wavelength to sub-10-fs *** also demonstrate a two-stage implementation to compress the pulses further to sub-5-fs *** the two-stage setup,the generated supercontinuum includes wavelengths ranging from 500 to 1100 *** multiplate setup is compact,robust,and stable,which makes it ideal for applications at free-electron laser facilities such as pump-probe experiments and laser-arrival timing tools.

关键词： post-compression self-phase modulation supercontinuum generation

Conditioning of BPM pickup signals for operations of the Duke storage ring with a wide range of single-bunch current

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Chinese Physics C 2014年第10期38卷 82-91页

作者：徐卫李京祎黄森林 W.Z.Wu H.Hao P.Wang Y.K.Wu National Synchrotron Radiation Laboratory (NSRL) University of Science and Technology of China Dept.of Physics Duke University and FEL labTriangle Universities Nuclear LaboratoryDurhamNC 27708-0308USA Institute of Heavy Ion Physics Peking University

The Duke storage ring is a dedicated driver for the storage ring based oscillator free-electron lasers（fels）, and the High Intensity Gamma-ray Source（HIGS）. It is operated with a beam current ranging from about1 mA to 100 mA per bunch for various operations and accelerator physics studies. High performance operations of the fel and γ-ray source require a stable electron beam orbit, which has been realized by the global orbit feedback system. As a critical part of the orbit feedback system, the electron beam position monitors（BPMs） are required to be able to precisely measure the electron beam orbit in a wide range of the single-bunch current. However, the high peak voltage of the BPM pickups associated with high single-bunch current degrades the performance of the BPM electronics, and can potentially damage the BPM electronics. A signal conditioning method using low pass filters is developed to reduce the peak voltage to protect the BPM electronics, and to make the BPMs capable of working with a wide range of single-bunch current. Simulations and electron beam based tests are performed. The results show that the Duke storage ring BPM system is capable of providing precise orbit measurements to ensure highly stable fel and HIGS operations.

关键词： beam position monitor signal conditioning closed orbit feedback storage ring fel

MECHANICAL CHARACTERISTICS OF AUTOMOTIVE HYBRID DRIVES USING ELECTRIC POWER SPLITTING GENERATOR

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MECHANICAL CHARACTERISTICS OF AUTOMOTIVE HYBRID DRIVES USING...

让老教材“新”起来——“圆柱的认识”教学片段与评析

第4届国际电力电子及运动控制国际会议

作者： Zdeněk eovsk■ Pavel Mindl Dept Electrical Drives and Traction Czech Technical University fel Prague 6 Czech Republic Dept Electrical Drives and Traction Czech Technical University fel Prague 6.Czech Republic

＜正＞ Paper deals with automotive hybrid and power splitting drive. Well-tried DC power splitting drive used on Express Czechoslovak Units is described. These units were in operation between 1936-1951 years. New idea to use a similar drive with AC machinery and power electronic converters is studied in Research Centre of Combustion Motors and Automobiles Josef Bozek. Mechanical characteristics and power flow in a physical model were calculated and efficiency were measured. Results will be published.

关键词： Electric hybrid vehicles power splitting mechanical characteristics.

来源： cnki会议评论

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小学教育科研论坛 2003年第12期2卷 46-47页

作者：荆文伟丹阳市皇塘中心小学，江苏丹fel212327

《数学课程标准》指出:“教师要积极利用各种教学资源,创造性地使用教材,设计适合学生发展的教学过程。”而教材的更新是周期性较长的过程,如何在新课标思想的指导下,创造性地使用好现行的老教材,做到“穿旧鞋走新路”。

关键词：数学教学人教版第十册 “圆柱的认识” 教学片段评析教学设计学习方法

Leukocyte-technetium-99m uptake in Crohn's disease:Does it show subclinical disease?

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World Journal of Gastroenterology 2010年第3期16卷 365-371页

作者： Luciene G Mota Luiz GV Coelho Carlos JR Simal Maria LA Ferrari Clodomiro Toledo Josep Martin-Comin Simone OF Diniz Valbert N Cardoso Nuclear Engineering Department Federal University of Minas Gerais Gastro-enterology ALFA Institute Clinical HospitalFederal University of Minas Gerais Nuclear Medicine Felício Rocho HospitalMedicine FacultyFederal University of Minas Gerais Medicine Nuclear Center Bellvitge Hospital Radioisotope Laboratory Pharmacy FacultyFederal University of Minas Gerais

AIM:To evaluate inflammatory activity in patients with Crohn's disease (CD) using technetium-99m-hexamethylpropyleneamine oxime (99mTc-HMPAO) granulocyte ***: Twenty patients (7 male and 13 female) with CD and five healthy volunteers were selected for 99mTc-HMPAO granulocyte scintigraphy. The Crohn's Disease Activity Index (CDAI), blood tests and C-reactive protein (CRP) of each patient were performed 7 d before the scintigraphic images. The leukocytes were labeled according to the International Society of Radiolabeled Blood Elements (ISORBE) consensus protocol and the scintigraphic images, including single photon emission computed tomography, were obtained 30 min and 2 h after injection of the radiolabeled ***:The labeling yield of the leukocytes with the lipophilic complex 99mTc-HMPAO was 55.0%±10%. Six of the 20 patients (30%) presented congruent results for the three parameters investigated (CDAI, Scintigraphic Index and CRP). On the other hand, 14 patients (70%) did not show congruent results. There was no significant correlation between the indices analyzed according to the Spearman test (P>0.05,n=20).CONCLUSION: The results suggest that 99mTc-HMPAO-labeled leukocyte scintigraphy could be important for determining inflammatory activity in CD even in the absence of clinical symptoms.

关键词： Technetium-99m Hexamethylpropyleneamine oxime Leukocytes Inflammatory bowel disease Scintigraphy

Chemotherapy induces cell plasticity;controlling plasticity increases therapeutic response

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Signal Transduction and Targeted Therapy 2023年第8期8卷 3563-3566页

作者： Francisco J.Iborra Cristina Martí Virtu Calabuig-Navarro Petros Papadopoulos Salvador Meseguer Pedro M.Iborra Francisco García Antonio Martínez-Lorente Fernando Almazán Juana Calabuig Centro de Investigación Príncipe felípe(Associated Unit to Instituto de Biomedicína de Valencia) ValenciaSpain Pathology and Molecular Therapy Department Instituto de Biomedicína de Valencia(IBV)CSICValenciaSpain Molecular and Cellular Biology Department Centro Nacional de Biotecnología(CNB)CSICMadridSpain Hematology Department Hospital Clínico San CarlosMadridSpain Medical Systems Biology Faculty of MedicineUniversity of HelsinkiHelsinkiFinland IC Biomed AlicanteSpain VinalopóHospitals Elcheand Biotechnology DepartmentUniversidad de AlicanteAlicanteSpain

Dear Editor,One of the most serious issues in modern oncology is the ineffectiveness of treatments in destroying tumours,which leads to tumour recurrence and,ultimately,patient *** phenomenon is caused by conventional therapies’fractional killing of tumour cells,which can also cause resistant cells to spread.1 We analysed chemotherapy-resistant cells and discovered that they are smaller than untreated cells(Fig.1a).The fact that this phenomenon occurs in all tested cell types(Hela,A549,Huh7,and MCF7)and regardless of the chemotherapy regimen(TRAIL,Camptothecin,Doxorubicin)suggests that it is a widespread phenomenon(Fig.1a,Supplementary Fig.S1).

关键词： chemotherapy tumour plasticity

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出纳在会计基础工作规范中的作用

中国电子商务 2014年第3期 208-208页

作者：孙卫怡南阳医专一附院河南南fEl473058

高质量的会计基础工作离不开出纳工作的支持。出纳作为会计基础工作中重要的组成部分，提高出纳工作的质量，能够从根本上推动会计基础工作规范化发展。本文就出纳在会计基础工作规范中的作用进行阐述，试探性的提出提高出纳工作质量的... 详细信息

高质量的会计基础工作离不开出纳工作的支持。出纳作为会计基础工作中重要的组成部分，提高出纳工作的质量，能够从根本上推动会计基础工作规范化发展。本文就出纳在会计基础工作规范中的作用进行阐述，试探性的提出提高出纳工作质量的对策，以供广大同行参考与借鉴。

关键词：出纳会计基础工作规范作用