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| 1 | Trend,seasonal and diurnal variations of atmospheric CO_2 in Beijing显示文摘The concentration of atmospheric CO2 in Beijing increased rapidly at a mean growth rate of 3.7%·a-1 from 1993 to 1995. After displaying a peak of (409.7±25.9) μmol·mol-1 in 1995, it decreased slowly. Both the almost stable anthropogenic CO2 source and increasing biotic CO2 sink contribute to the drop of CO2 concentration from 1995 to 2000. The seasonal variation of CO2 concentration exhibits a clear cycle with a maximum in winter, averaging (426.8± 20.6)μmol·mol-1, and a minimum in summer, averaging (369.1±6.1)μmol·mol-1. The seasonal variation of CO2 concentration is mainly controlled by phenology. The mean diurnal variation of atmospheric CO2 concentration for a year in Beijing is highly clear: daily maximum CO2 concentration usually occurs at night, but daily minimum CO2 concentration does in the daytime, with a mean diurnal difference more than 34.7μmol·mol-1. It has been revealed that the interannual variations of atmospheric CO2 concentration in winter and autumn regulated the | WANG Yuesi, WANG Changke, GUO Xueqing, LIU Guangren & HUANG YaoLAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100083, China Department of Chemistry, Capital Normal University, Beijing 100037, China | 2002 | Chinese Science Bulletin2002，47，24： | 8 |
| 2 | Effect of Train Carbody's Parameters on Vertical Bending Stiffness Performance显示文摘Finite element analysis(FEA) and modal test are main methods to give the first-order vertical bending vibration frequency of train carbody at present, but they are inefficiency and waste plenty of time. Based on Timoshenko beam theory, the bending deformation,moment of inertia and shear deformation are considered. Carbody is divided into some parts with the same length, and it's stiffness is calculated with series principle, it's cross section area, moment of inertia and shear shape coefficient is equivalent by segment length,and the fimal corrected first-order vertical bending vibration frequency analytical formula is deduced. There are 6 simple carbodies and1 real carbody as examples to test the formula, all analysis frequencies are very close to their FEA frequencies, and especially for the real carbody, the error between analysis and experiment frequency is 0.75%. Based on the analytic formula, sensitivity analysis of the real carbody's design parameters is done, and some main parameters are found. The series principle of carbody stiffness is introduced into Timoshenko beam theory to deduce a formula, which can estimate the first-order vertical bending vibration frequency of carbody quickly without traditional FEA method and provide a reference to design engineers. | YANG Guangwu WANG Changke XIANG Futeng XIAO Shoune | 2016 | Chinese Journal of Mechanical Engineering2016，29，6： | 7 |
| 3 | Imipenem:apotent inducer of multidrug resistance in Acinetobacter baumannii显示文摘 | Kuo H Y ChangK C KuoJ W | | 0，，01： | 1 |
| 4 | Seismic behavior of steel frame with added viscoelastic dampers 显示文摘 | ChangK C Soong T T Oh S T Lai M L | 1995 | Journal of Structural Engineering ASCE1995，121，10： | 1 |
| 5 | Oralurografin in postoperativesmall bowel obstruction显示文摘 | Chen SC Changk J Lee P | 1999 | World J Surg1999，23，10： | 1 |
| 6 | Glycosylation induced increa-ses in bloodflow and 1251-albamn permeation: role ofnitric oxide and superoxide (abstract) 显示文摘 | Lihon RG ChangK AllisonW | 1993 | FASEB1993，，： | 1 |
| 7 | Sagittal translation in opening wedge osteotomy for the correction of thoracolombar kyphotic deformity in ankylosing spondylitis显示文摘 | ChangK W ChenH C ChenYY etal | 2006 | Spine2006，31，10： | 1 |
| 8 | Effect of ambient temperature on viscoelastically damped structures显示文摘 | ChangK C Song T T Oh S T Lai M L | 1992 | Structure Engineering1992，118，7： | 1 |
| 9 | LIB- LINEAR: A library for large linear classification显示文摘 | FAN R E CHANGK W HSIEH C J etal | 2008 | The Journal of Machine Learning Research2008，9，： | 1 |
| 10 | A thalassaemia array forSoutheast Asia显示文摘 | ChangK Wong M S Chan T K | 2004 | Br J Haematol2004，124，： | 1 |
| 11 | Glycosylationinducedincreasesinbloodflowand125I-albamnpermeation:roleofnitricoxideandsuperoxide(Abstract)显示文摘 | 12.TiltonRG ChangK AllisonW etal | 1993 | FASEB1993，7，： | 1 |
| 12 | Theoreticalandexperimentalstudyoftheinputimpedanceofthecylindricalcavity-backedrectangularslotantennas显示文摘 | LiM HummerK A ChangK | 1991 | IEEE Trans on Antennas and Pripagation1991，39，8： | 1 |
| 13 | Endoseopic ultrasound-gulded fine-needle injeetion显示文摘 | Klapman J B ChangK J | 2005 | Gastrointest Endosc Clin N Am2005，15，1： | 1 |
| 14 | The effect of DEM resolution on slope and aspect mapping显示文摘 | ChangK TsaiB | 1991 | Cartography and Geographic Information Systems1991，1，： | 1 |
| 15 | GproteincoupledreceptorforleukotrieneB4thatmediateschemotaxis显示文摘 | YokomizoT IzumiT ChangK TakuwaY ShimizuT | 1997 | Nature1997，387，62： | 1 |
| 16 | Prevention of vascular and neural dysfunction in diabetic rats by C-peptide显示文摘 | Ido Y Vindigni A Changk | 1997 | Science1997，277，5325： | 1 |
| 17 | Select depression of T-lym-phocytesubset in gastriccancer patients:An implication of im-munotherapy显示文摘 | LEE W J CHANGK J LEE C S | | 0，，03： | 1 |
| 18 | Influence of rigid central buckle on seismic response of long-span suspension bridges显示文摘 | 王浩 Li Aiqun Jiao Changke Zou Keguan | 2011 | High Technology Letters2011，17，2： | 1 |
| 19 | Acomparisonstudyofthecapacitivebehaviorforsolgel-derivedandcoGannealedrutheniumGtinoxidecomposites显示文摘 | HuCC WangCC ChangK H | 2007 | ElectrochimicaActa2007，52，7： | 1 |
| 20 | 显示文摘 | ChangK Chen W Ma L | 2011 | J Mater Chem2011，21，17： | 1 |
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