检索结果-南通市图书馆

Quantitative computed tomography measurement of cross-sectional area of small pulmonary vessels in asthmatic patients

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

Chinese Medical Journal 2019年第16期132卷 1903-1908页

作者： Juan Wang mei-jiao li Chun Chang Department of Respiratory and Critical Care Medicine Peking University Third HospitalBeijing 100191China Department of Radiology Peking University Third HospitalBeijing 100191China

Background: Cross-sectional area (CSA) for small pulmonary vessels is considered a parameter of pulmonary vessel alterations in patients with chronic obstructive pulmonary disease. This study was to evaluate the correlation of CSA with airflow obstruction parameters in asthma. Furthermore, we aimed to measure the difference in vascular alteration between asthma phenotypes and evaluate its relation with cytokine levels. Methods: We consecutively enrolled 20 adult asthmatic patients (13 women: age range, 26–80 years) and 20 healthy controls (8 women: age range, 23–61 years) from Peking University Third Hospital. Total CSA lice spiral computed tomography, and the percentage CSA linked immunosorbent assay was used to detect the expression of leptin, total immunoglobulin E, periostin, and transforming growth factor β1 in serum and matrix metalloproteinase 9 in induced sputum supernatant of asthmatic patients. The differences in %CSAlinical indexes and inflammatory cytokine levels. Results: Patients with asthma and controls did not differ in %CSAlimitatio

关键词： Asthma Computed tomography Airway remodeling

Kinetic Energy of Trapped Ions Cooled by Buffer Gas

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

Chinese Physics Letters 2010年第6期27卷 82-84页

作者： CHEN liang SHE Lei li jiao-mei GAO Ke-lin State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 Center for Cold Atom Physics Chinese Academy of Sciences Wuhan 430071 Graduate School of the Chinese Academy of Sciences Beijing 100049

The average kinetic energy of 40 Ca＋ ions is measured by the method of evaporating ions in an rf ion trap. The kinetic energy of the ion 40Ca＋ varies from 0.5eV to 0.2eV with changing buffer gas pressure from 10^-7 mbar to 10^-5 mbar. The Brownian motion model is also introduced to calculate the average kinetic energy of the trapped ions.

关键词： STOPPING power (Nuclear physics) ION traps CALCIUM ions EVAPORATION (Chemistry) VAPOR pressure BROWNIAN motion processes

Charge Transfer for Reactions of Sc^(3+) with N_(2) and H_(2) at Electron-volt Energy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2001年第4期18卷 528-530页

作者： JIANG Yu-Rong NIE Zong-Xiu li jiao-mei GAO Ke-lin Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071

The charge transfer rate coefficients for reactions of Sc^(3+)with N_(2) and H_(2) have been measured at the mean collision energy of *** rate coefficients are derived from the decay rate of ion signals by using ion storage in a radio-frequency ion *** rate coefficients are 8.18(0.18)×10^(-10)cm^(3)·s^(-1) at Tequiv≈1.26×10^(4)K for Sc^(3+) with N_(2) and 1.44(0.39)×10^(-9)cm^(3)·s^(-1) at Tequiv>≈1.67×10^(3) K for Sc^(3+) with H_(2),*** results are comparable with the Langevin rate coefficients.

关键词： coefficients Electron H_

Observation of Hysteresis of the Ion Cloud Motion in an rf Trap

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1997年第8期14卷 581-584页

作者： GAO Ke-lin LUO Xue-li ZHU Xi-wen YAN Min li jiao-mei Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of PhysicsChinese Academy of SciencesWuhan 430071

Variations of the hysteresis of the rf detection signals corresponding to the axial motion of an ion cloud in a Paul trap versus the detection voltage,operation parameters and number of ions have been *** features are explained by an extended pseudopotential model with an octupole potential correction and an effective potential from the ion cloud.

关键词： correction hysteresis Hyster

Effect of the Double Frequency of Trap Field in a Paul Trap

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2001年第11期36卷 593-596页

作者： NIE Zong-Xiu FENG Mang li jiao-mei SHI Lei ZHU Xi-Wen GAO Ke-lin State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsThe Chinese Academy of SciencesWuhan 430071China

The effect of double frequency oftrap fieldφ=U-V1 cosΩt-V2 cos 2Ωt in a Paul trap can be described exactly by using a function series expansion to solve the corresponding Mathieu *** stability regions of a trapped ... 详细信息

关键词： double frequency trap field Paul trap

A Method of Measuring the Axial Secular Motion Temperature of Trapping Large Size Ion Clouds

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第3期30卷 18-21页

作者： YANG Yu-Na liU Hao HE Yue-Hong li Hai-Xia CHEN Yi-He SHE Lei CHEN liang li jiao-mei Key Laboratory of Atomic Frequency Standards(KLAFS) Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071 University of the Chinese Academy of Sciences Beijing 100049

A large cloud of ^(40)Ca^(+) is successfully trapped and manipulated in a linear ion *** axial length of the ion cloud is measured under a series of end-cap *** propose a method of measuring the axial secular motion temperature of the ion cloud by analyzing its image on an electron-multiplying *** method is based on the Boltzmann equation that the axial density distribution of ions at secular motion temperature T *** axial secular motion temperature of the ion cloud is also obtained by measuring the Doppler broadened line *** the same trapping parameters,the axial secular motion temperature by analyzing the image of ion cloud is 840 K and by fitting the experimental resonance line profile is 700 K.

关键词： axial trapping fitting

Experimental Determination(∼mHz)of the Ground-State Hyperfine Separation of Trapped ^(199)Hg^(+) in a Hyperbolic Paul Trap

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第12期29卷 70-73页

作者： HE Yue-Hong SHE Lei CHEN Yi-He YANG Yu-Na liU Hao li jiao-mei Key Laboratory of Atomic Frequency Standards(KLAFS) Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071 Graduate School Chinese Academy of SciencesBeijing 100190

The Ramsey fringes on the ground-state hyperfine transition of ^(199)Hg^(+)(ΔF=1,ΔmF=0)ions trapped in a hyperbolic Paul trap are firstly observed with the method of time-separated oscillatory *** full width at half maximum of central Ramsey fringes is about 25 mHz and the corresponding quality factor Q of the line is greater than 10^(12) for the trapped ^(199)Hg^(+)microwave frequency *** hyperfine transition frequency shifted by magnetic field is also measured by the high-resolution Ramsey *** final result isΔνhfs=40507347997.3(0.5)Hz,which is corrected to zero magnetic field.

关键词： field. Ramsey

Paroxysmal Kinesigenic Dyskinesia:Genetics and Pathophysiological Mechanisms

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2024年第7期40卷 952-962页

作者： jiao-jiao Xu Hong-Fu li Zhi-Ying Wu Department of Medical Genetics and Center for Rare Diseases The Second Affiliated HospitalZhejiang University School of MedicineHangzhou 310009China Department of Neurology in the Second Affiliated Hospital Key Laboratory of Medical Neurobiology of Zhejiang ProvinceZhejiang University School of MedicineHangzhou 310009China

Paroxysmal kinesigenic dyskinesia(PKD),the most common type of paroxysmal movement disorder,is characterized by sudden and brief attacks of choreoathetosis or dystonia triggered by sudden voluntary *** is mainly caused by mutations in the PRRT2 or TMEM151A *** exact pathophysiological mechanisms of PKD remain unclear,although the function of PRRT2 protein has been well characterized in the last *** on abnormal ion channels and disturbed synaptic transmission in the absence of PRRT2,PKD may be channelopathy or synaptopathy,or *** addition,the cerebellum is regarded as the key pathogenic *** depolarization in the cerebellum is tightly associated with dyskinetic ***,in PKD,other than the cerebellum,the role of the cerebrum including the cortex and thalamus needs to be further investigated.

关键词： Paroxysmal kinesigenic dyskinesia PRRT2 TMEM151A Genetics Pathophysiological mechanisms

A Possible γ-Ray Pulsation from PSR J1740-5340B in the Globular Cluster NGC 6397

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第1期24卷 285-291页

作者： jiao Zheng Pengfei Zhang li Zhang Department of Astronomy School of Physics and AstronomyKey Laboratory of Astroparticle Physics of Yunnan ProvinceYunnan UniversityKunming 650091China

Recently, a new radio millisecond pulsar(MSP) J1740-5340B, hosted in the globular cluster(GC) NGC 6397,was reported with a 5.78 ms spin period in an eclipsing binary system with a 1.97 days orbital period. Based on a modified radio ephemeris updated by tool tempo2, we analyze the ~15 yr γ-ray data obtained from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope and detect PSR J1740-5340B's γ-ray pulsation at a confidence level of ~4σ with a weighted H-test value of ~26. By performing a phase-resolved analysis, the γ-ray luminosity in on-pulse interval of PSR J1740-5340B is L_(γ)~ 3.8 × 10^(33) erg s^(-1) using NGC 6397's distance of 2.48 kpc. And γ-rays from the on-pulse part of PSR J1740-5340B contribute ~90% of the total observed γ-ray emissions from NGC 6397. No significant γ-ray pulsation of another MSP J1740-5340A in the GC is *** that the previous four cases of MSPs in GCs, more data in γ-ray, X-ray, and radio are encouraged to finally confirm the γ-ray emissions from MSP J1740-5340B, especially starving for a precise ephemeris.

关键词： gamma-rays:galaxies (stars:)pulsars:individual(PSR J1740-5340B) (Galaxy:)globular clusters:individual(NGC 6397)