Accumulating evidence indicates that overweight and obesity are the major international public health concern. Obesity is a major independent risk factor for chronic diseases, such as hypertension, type 2 diabetes, ca...Accumulating evidence indicates that overweight and obesity are the major international public health concern. Obesity is a major independent risk factor for chronic diseases, such as hypertension, type 2 diabetes, cardiovascular disease, stroke, and certain cancer. Disease burden due to obesity has been dramatically increasing in many countries including China in the past years. According to the Nationwide Health and Nutrition Survey （CHNS）, the prevalence of overweight and obesity among men and women in China increased by 27.6% and 8.8%, respectively, from 1993 to 2009.展开更多
We report a gradual brighteningγ-ray source,4FGL J1718.5+4237,in 0.1-500.0 GeV,which may be associated with a blazar NVSS J171822+423948 with a redshift of~2.7.We analyzed 15.25 yr ofγ-ray data recorded by the Large...We report a gradual brighteningγ-ray source,4FGL J1718.5+4237,in 0.1-500.0 GeV,which may be associated with a blazar NVSS J171822+423948 with a redshift of~2.7.We analyzed 15.25 yr ofγ-ray data recorded by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope and detected significantγ-ray emissions in the direction of the blazar with a test statistic(TS)of~135.Based on timing analysis using a 1 yr time bin,we have observed a gradual brightening inγ-ray emissions from the target.In our analysis,we categorize them into two states:Quiet(TS~0)and Loud(TS~226)states,with the distinction occurring in 2016 August(MJD57602.69).From the Quiet state to the brightest period(the last data point),theγ-ray flux in 0.1-500.0 GeV increased by more than 12-fold from<0.2×10^(-8)photons cm^(-1)s^(-1)to 2.6×10^(-8)photons cm^(-1)s^(-1).Additionally,we studied the spectral properties in detail for the Loud state and the overall data.While no significant variation was detected,both exhibited a spectral indexΓof~2.6.The origin of the brighteningγ-ray emissions from the target is not yet clear.Future long-term multi-wavelength observations and studies will provide insight into the astrophysical mechanisms of the target.展开更多
We present a comprehensive analysis of AstroSat/LAXPC data of the second spin-up and second spin-down phases of the persistent X-ray pulsar 4U 1626-67.Flares followed by a broad dip are detected in the spin-up observa...We present a comprehensive analysis of AstroSat/LAXPC data of the second spin-up and second spin-down phases of the persistent X-ray pulsar 4U 1626-67.Flares followed by a broad dip are detected in the spin-up observations.The pulse profiles changed from a shoulder-like structure to a broad sinusoidal shape as the source underwent a torque reversal from spin-up to spin-down.Energy-resolved pulse profiles in lower energies showed a double-horned profile in the spin-up state and a flat top with multiple peaks in the spin-down state.Regardless of the torque state,the pulse profiles exhibit a broad single-peaked shape at higher energies.The observation in the spin-down era is characterized by the presence of a prominent QPO at 46.5±1.0 mHz frequency.The QPO rms and center frequency show a correlation with energy.Spin-up and spin-down states show a difference in the shape of the power density spectrum.After the torque reversal,a gradual flux drop and the hardening of the spectra were observed.The difference in the shape of the pulse profiles and the presence and absence of QPOs can be explained by the change in accretion flow geometry of the pulsar,from pencil-beam to fan-beam,between spin-down and spin-up states.展开更多
[目的]探讨改进组合赋权法与多准则妥协解排序法(VIKOR)相结合开展茄芯化学品质评价,以期丰富雪茄烟叶质量评价方法。[方法]以云南茄芯烟叶化学成分为研究对象,引入变异系数和复相关系数改进传统CRITIC法(Criteria importance through i...[目的]探讨改进组合赋权法与多准则妥协解排序法(VIKOR)相结合开展茄芯化学品质评价,以期丰富雪茄烟叶质量评价方法。[方法]以云南茄芯烟叶化学成分为研究对象,引入变异系数和复相关系数改进传统CRITIC法(Criteria importance through inter-criteria correlation),采用e^(0/4)~e^(8/4)标度取代层次分析法(Analytic hierarchy process,AHP)中的1~9标度,并基于博弈论计算组合权重,利用无权重个体遗憾值改进的VIKOR法开展茄芯化学品质评价。[结果]与传统CRITIC法确定的化学成分指标权重相比,改进CRITIC法中钾的权重提升1.09倍,还原糖指标权重降低45.26%;e^(0/4)~e^(8/4)标度与1~9标度AHP法确权结果相比,权重大小排序一致,不同化学成分指标间权重的差异减小;改进VIKOR法与传统方法对茄芯化学品质的排序结果具有较高的一致性,但也存在不可忽略的差异,说明有必要在个体遗憾值中考虑权重的影响。[结论]改进CRITIC法能够解决传统方法确权受计量单位和正负向指标影响的问题,AHP法中通过标度的替代显著提升判断矩阵的一致性,无权重个体遗憾值条件下的VIKOR法在综合考虑化学品质整体表现的同时,突显了表现较差的化学成分指标的作用,评价结果相对合理。展开更多
基金supported by Shanghai Rising-Star Program (12QH1401700)the Drug Innovation Program of the National Science and Technology Project (2011ZX09307-001-02)+2 种基金Science Foundation of Shanghai Municipal Health Bureau (2012291)Excellent Young Medical Experts of Shanghai (XYQ2011041)Program of Shanghai Municipality for Basic Research (11JC1409600)
文摘Accumulating evidence indicates that overweight and obesity are the major international public health concern. Obesity is a major independent risk factor for chronic diseases, such as hypertension, type 2 diabetes, cardiovascular disease, stroke, and certain cancer. Disease burden due to obesity has been dramatically increasing in many countries including China in the past years. According to the Nationwide Health and Nutrition Survey （CHNS）, the prevalence of overweight and obesity among men and women in China increased by 27.6% and 8.8%, respectively, from 1993 to 2009.
基金supported in part by the National Natural Science Foundation of China(NSFC,grant Nos.12233006 and 12163006)the Basic Research Program of Yunnan Province No.202201AT070137+1 种基金the joint foundation of Department of Science and Technology of Yunnan Province and Yunnan University No.202201BF070001-020support by the Xingdian Talent Support Plan—Youth Project。
文摘We report a gradual brighteningγ-ray source,4FGL J1718.5+4237,in 0.1-500.0 GeV,which may be associated with a blazar NVSS J171822+423948 with a redshift of~2.7.We analyzed 15.25 yr ofγ-ray data recorded by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope and detected significantγ-ray emissions in the direction of the blazar with a test statistic(TS)of~135.Based on timing analysis using a 1 yr time bin,we have observed a gradual brightening inγ-ray emissions from the target.In our analysis,we categorize them into two states:Quiet(TS~0)and Loud(TS~226)states,with the distinction occurring in 2016 August(MJD57602.69).From the Quiet state to the brightest period(the last data point),theγ-ray flux in 0.1-500.0 GeV increased by more than 12-fold from<0.2×10^(-8)photons cm^(-1)s^(-1)to 2.6×10^(-8)photons cm^(-1)s^(-1).Additionally,we studied the spectral properties in detail for the Loud state and the overall data.While no significant variation was detected,both exhibited a spectral indexΓof~2.6.The origin of the brighteningγ-ray emissions from the target is not yet clear.Future long-term multi-wavelength observations and studies will provide insight into the astrophysical mechanisms of the target.
基金financial support from ISRO(Sanction Order:No.DS_2B-13013(2)/3/2021-Sec.2)。
文摘We present a comprehensive analysis of AstroSat/LAXPC data of the second spin-up and second spin-down phases of the persistent X-ray pulsar 4U 1626-67.Flares followed by a broad dip are detected in the spin-up observations.The pulse profiles changed from a shoulder-like structure to a broad sinusoidal shape as the source underwent a torque reversal from spin-up to spin-down.Energy-resolved pulse profiles in lower energies showed a double-horned profile in the spin-up state and a flat top with multiple peaks in the spin-down state.Regardless of the torque state,the pulse profiles exhibit a broad single-peaked shape at higher energies.The observation in the spin-down era is characterized by the presence of a prominent QPO at 46.5±1.0 mHz frequency.The QPO rms and center frequency show a correlation with energy.Spin-up and spin-down states show a difference in the shape of the power density spectrum.After the torque reversal,a gradual flux drop and the hardening of the spectra were observed.The difference in the shape of the pulse profiles and the presence and absence of QPOs can be explained by the change in accretion flow geometry of the pulsar,from pencil-beam to fan-beam,between spin-down and spin-up states.
文摘目的:结合赛艇专项运动特点,利用Concept Ⅱ赛艇测功仪对最大乳酸稳态(MLSS)测试进行改进,并根据MLSS测试判定赛艇运动员以4mmol/L乳酸阈(AT4)和个体乳酸阈(IAT)指代无氧阈的有效性。方法:10名男子公开级赛艇运动员在Concept Ⅱ赛艇测功仪上进行1次递增负荷测试和2～4次30min恒定负荷测试,在相应的负荷间歇测定血乳酸。通过递增负荷测试获取AT4和IAT,并在恒定负荷测试中分别以AT4和IAT作为初试负荷,以2.5%IAT作为最小调整负荷,以运动中第10～30min乳酸浓度上升<1mmol/L作为判定标准获取MLSS。结果:1)AT4和MLSS发生时功率分别为342.4±18.8W vs 312.5±16.0W,二者差异非常显著(P<0.01)且相关较弱(r=0.607,P>0.05);AT4高估MLSS功率达9.7%,二功率相对差异范围为0%～15.4%;仅2人以AT4强度完成30min恒定负荷测试,其中1人达到MLSS。2)IAT功率为314.4±19.9W,略高于MLSS功率(P>0.05),二者相关非常显著(r=0.885,P<0.01);IAT比MLSS功率高0.6%,相对差异范围为-4.8%～5.3%;所有受试者均能以IAT强度完成30min恒定负荷测试,其中7人以稳态乳酸完成,且有5人在IAT强度达到MLSS。结论:结合赛艇运动员专项特征的MLSS测试方案能提高测试的简便性和准确性;AT4显著地高估了赛艇运动员的无氧阈水平,而IAT可作为赛艇运动员无氧阈训练的有效负荷区间。
