盐池沙地主要饲料灌木树种特性的观测

In order to raise the utilization ratio of forage shrub forest, the characteristics of the shrub species(\%Caragana intermidia, C.korshinkii,Hedysarum scroparium, H.fruticosum, H.fruticosum Pau. var. Laeve, Atraphaxisbracterate, Tamarix chinensis, Artemisia ordosica\%) were studied. the results showed that 8 shrubs can resist the cold or extremely hot weather. Their lateral roots were abundant. Their branches and leaves contained many coarse fat, coarse protein, all kinds of nutrient elements and 19 amino acids. The change law of their yield and the relation between yield and site, density, age, size, cutting were also studied.

GeV伽玛射线噪blazar天体观测特性的统计分析

收集了35个GeV伽玛射线噪blazar天体的从光学到伽玛射线波段观测数据.计算了αxγ,xαox,αγxγ,分析了Γγ和logpνeak,Γx和logνpeak以及Γx和Γγ的相关性,得出FSRQs具有较大的Γγ光子谱指数,对应的谱较陡,而HBLs具有较小的Γx光子谱指数,其谱较平.BL-Lacs和FSRQs的αxγ与xαox,αxox与αγxγ存在明显的负相关.

河外H_2O超脉泽源的观测特性

研究了至今为止已发现的 2 0个河外H2 O超脉泽源的观测参数。多数河外H2 O超脉泽源的光度在几十至几百个L⊙ 之内 ,但TXFS2 2 2 6 - 184源的河外H2 O超脉泽源光度达 6 10 0L⊙ ,它属于射电星系类型 ,主要是由于其谱线轮廓较宽所造成的一种例外情况。所有 2 0个河外H2 O超脉泽源的系统速度约为几百到几千km·s- 1,16个河外H2 O超脉泽源的峰值流量密度小于 1Jy ,但有 4个河外H2 O超脉泽源的峰值流量密度大于 6Jy(6 .2～ 16Jy)。通过对这些河外H2 O超脉泽源的观测参数特征的分析和研究 ,得到这些观测参数之间的相关关系为 :河外H2 O超脉泽源的峰值流量密度的对数分别与系统速度的对数和距离的对数之间存在着反相关关系。而河外H2

大偏心率小倾角GEO SAR观测特性及成像研究

地球同步轨道合成孔径雷达(Geosynchronous Earth Orbital Synthetic Aperture Radar,GEO SAR)具有重访周期短,观测区域大等优势,可以对大面积热点区域进行长时间连续观测,在军事侦察、土壤湿度和自然灾害监测等领域具有重要应用前景。当前GEO SAR研究主要集中在大倾角小偏心率轨道,而关于大偏心率小倾角则鲜有涉及。因此针对大偏心率小倾角GEO SAR的观测特性问题,仿真了卫星在不同轨道配置下的空间轨迹及覆盖性能示意图,说明了其观测性能优势,并仿真了此时“走-停”假设误差的大小,使用后向投影(Back Projection,BP)算法给出了卫星在不同轨道位置处的聚焦成像结果,说明成像算法的有效性。

蓝离散星研究现状(Ⅱ):观测特性

不同恒星系统(银河系晕、疏散星团、球状星团、矮星系)中蓝离散星所表现出的观测特性各不相同,这与恒星系统动力学环境及相应的蓝离散星主导形成机制直接相关。因此,分析研究蓝离散星的不同观测特性,也就成为研究蓝离散星形成机制、恒星及双星系统演化以及恒星系统动力学演化的有效方法。

仙王座β型变星的观测特性和脉动激发机制(英文)

仙干座β型星是上部土序的一类短周期变星,它们的脉动起因是一个长期使人困惑的问题。本文评述了仙干座β型星的一些观测特性,如物理参数,不稳定带在赫罗图中的位置,演化阶段,周期和脉动模式等。我们同时也讨论了几个脉动激发机制,即恒星通过什么途径使别的能量转化为脉动的机械能。机制分深层和包层两类,重点讨论了不透明度机制。

运用ROC探讨全数字乳腺摄影对乳腺病灶大小的检测

运用ROC检测全数字乳腺摄影对乳腺病灶的大小。方法 将乳腺体模TRM放在数字乳腺X线摄影机的探测器上,模拟常规人体的乳腺将压力增加到40牛顿(N),根据机器的自动曝光装置获得30kV,64mAs的曝光条件,对乳腺体模TRM进行曝光,获得数字影像,在无任何影像后处理条件下,激光打印照片,请5位观测者在观片灯上对激光胶片进行视读,将视读结果用“五值法”赋予数据,运用ROC分析数据并进行方差统计处理,得出试读的统计学意义。结果 全数字乳腺摄影获得的乳腺体模TRM数字影像照片中,只有直径为0.2mm的钙化灶有统计学差别,所有肿块灶无统计学差别。结论 全数字乳腺摄影可检测出直径大于0.2mm的钙化灶,直径大于等于0.45mm的肿块灶全部可以检测出来。

辽西地区地基基础和建筑物的地震反应特性的研究

为了对中国辽西地区的地基基础和建筑物的地震反应特性进行研究,首先,对微动观测在辽西地区的时间侧面的安定性和微动观测在辽西地区的区域方面的适用性进行了试验和确认,并且得到了肯定的结果;然后,应用常时微动观测对辽西地区进行观测,并且对观测结果的准确性进行讨论;最后,根据观测结果作出卓越振动频率分布图和地基表层层厚图,再对辽西地区代表性建筑物(辽宁工学院国际交流中心)进行常时微动观测并和建筑物模型化的一次元和二次元分析结果进行比较,得到了比较一致的结果,证明了二次元模型化的正确性。根据以上结果在辽西地区选出地质条件不同的3点,设想国际交流中心建设在辽西地区3个地基构造不同的地基基础上,通过输入神户地震波进行地震反应分析。得到了由于地基反应特性不同,在相同的地震作用下,相同建筑物的反应特性、建筑物的轴力、剪应力都有很大的差异的规律。

新疆赛吾迭格尔大桥设计基准风速的计算与分析

为了确保赛吾迭格尔大桥抗风安全,有极其重要的地位,利用桥址区富蕴县气象站的风速基本资料分析了桥位周边平均风速、最大风速、历年的极值风速及各月平均风速、风向等基本特征;建立了气象站逐年最大风速序列,采用极值I型、皮尔逊Ⅲ型和不同规范计算了桥位处不同重现期的设计基本风速;同时考虑大桥所处喀拉塑克水库在蓄水或放空两种情况下地表类别的不同,推算出桥面处的设计基准风速,为进行大桥的风洞试验及颤振、抖振分析和结构分析时风荷载计算提供准确依据.

相接双星中的理论模型研究

相接双星是一类特殊的密近双星系统。相接双星的一些奇特观测结果目前还没有得到恒星演化理论的完美解释。本文阐述了相接双星的一些观测特性以及理论模型研究的现状,相接双星理论模型中存在的问题以及一些解决相接双星演化的方法。

动态反馈解耦规范型时域结构特征分析及变换矩阵的构造

从可解耦线性多输入多输出(Multi-input multi-output,MIMO)系统的结构特性指数出发,根据此类系统解耦后系统的可观测矩阵与基本向量矩阵的秩的关系,提出了按照这种关系将解耦规范型划分为4大类的观点,同时给出了一种针对各类积分型解耦系统构造相应的非奇异变换矩阵的构造方法.分析了解耦规范型及其变换矩阵的时域结构形式,通过一系列定理的证明,从一般意义上解释了解耦规范型的结构与变换矩阵的关系,并通过一个数值实例验证了所提出方法的正确性及可行性.

黑洞天体活动的基本面研究

活动星系核(中心黑洞质量MBH^10^6-10^10M⊙)和黑洞X射线双星(MBH^10M⊙)普遍被认为具有相似的中心引擎:黑洞、吸积盘和喷流.类似的中心引擎、质量相却差如此之大(6{9个数量级)的两类黑洞系统是否具有相似的物理仍不清楚.本文围绕不同尺度黑洞天体的物理性质和观测特性展开,主要研究了不同尺度黑洞天体活动的基本面关系以及黑洞X射线双星的能谱演化.

Performance of Regional Integrated Environment Modeling System (RIEMS) in the Simulation of Surface Air Temperature over East Asia

Regional climate models (RCMs) have the potential for more detailed surface characteristic and mesoscale modeling results than general circulation models (GCMs).These advantages have drawn significant focus on RCM development in East Asia.The Regional Integrated Environment Modeling System,version 2.0 (RIEMS2.0),has been developed from an earlier RCM,RIEMS1.0,by the Key Laboratory of Regional ClimateEnvironment for Temperate East Asia (RCE-TEA) and Nanjing University.A numerical experiment covering 1979 to 2008 (simulation duration from 1 January 1978 to 31 December 2008) with a 50-km spatial resolution was performed to test the ability of RIEMS2.0 to simulate long-term climate and climate changes in East Asia and to provide a basis for further development and applications.The simulated surface air temperature (SAT) was compared with observed meteorological data.The results show that RIEMS2.0 simulation reproduced the SAT spatial distribution in East Asia but that it was underestimated.The simulated 30-year averaged SAT was approximately 2.0°C lower than the observed SAT.The annual and interannual variations in the averaged SAT and their anomalies were both well reproduced in the model.A further analysis of three sub-regions representing different longitudinal ranges showed that there is a good correlation and consistency between the simulated results and the observed data.The annual variations,interannual variations for the averaged SAT,and the anomalies in the three sub-regions were also captured well by the model.In summary,RIEMS2.0 shows stability and does well both in simulating the long-term SAT in East Asia and in expressing sub-regional characteristics.

Mixing matrix estimation of underdetermined blind source separation based on the linear aggregation characteristic of observation signals

Under the underdetermined blind sources separation(UBSS) circumstance,it is difficult to estimate the mixing matrix with high-precision because of unknown sparsity of signals.The mixing matrix estimation is proposed based on linear aggregation degree of signal scatter plot without knowing sparsity,and the linear aggregation degree evaluation of observed signals is presented which obeys generalized Gaussian distribution(GGD).Both the GGD shape parameter and the signals' correlation features affect the observation signals sparsity and further affected the directionality of time-frequency scatter plot.So a new mixing matrix estimation method is proposed for different sparsity degrees,which especially focuses on unclear directionality of scatter plot and weak linear aggregation degree.Firstly,the direction of coefficient scatter plot by time-frequency transform is improved and then the single source coefficients in the case of weak linear clustering is processed finally the improved K-means clustering is applied to achieve the estimation of mixing matrix.The proposed algorithm reduces the requirements of signals sparsity and independence,and the mixing matrix can be estimated with high accuracy.The simulation results show the feasibility and effectiveness of the algorithm.

Characteristics of coal re-oxidation based on microstructural and spectral observation

In order to investigate the characteristics of re-oxidation of residual coal in goafs in close coal seam mining,scanning electron microscope and infrared spectrometer are used to study the changes of coal microstructure and chemical reaction of functional groups of eight coal samples at different ranks.Result shows that after initial oxidation,the surface morphology of pore are different,and the porosity of coal is increased and the oxygen adsorption capacity of coal is improved.The change of coal molecular structure and presence of a large amount of active oxygen-containing functional groups lead to increasing tendency of coal to further oxidation.In addition,the higher lever of the initial oxidation is,the easier the re-oxidation occurs.

Observations of Aerosol Optical Properties in the Beijing Urban Area in Summer

To investigate aerosol optical properties in the Beijing metropolitan area, aerosol absorption coefficient （Ab）, scattering coefficient （So）, and fine particulate matter （PM2.5） were measured in the Beijing urban area from 20 May to 30 August 2009. The average Ab, So, single scat- tering albedo （SSA）, and PM2.5 concentration were 58.0±39.5 M m^-1, 343.5±353.7 M m 1, 0.80±0.10 and 63.6＋50.0 μg m^-3, respectively, during the observation period. Ab, Sc, and SSA all showed single peak diurnal variations, with their maximum values being measured at 0500, 1000, and 1300 local time, respectively. Ab and Sc had a strong positive correlation with PM2.5, and Ab, Sc, and PM25 all had positive correlations with relative humidity and negative correlations with wind speed.

运用ROC评价软、硬拷贝对视读乳腺病灶的影响

随着医学影像技术的发展，使用监视器上的软拷贝图像取代沿袭百年的胶片硬拷贝进行诊断无疑是一次巨大的变革。对于威胁女性健康的乳腺癌，它的早期诊断和治疗可使5年生存率达92％。因此，本文就软、硬拷贝两种模式对乳腺癌病灶识别进行了探讨，现将探讨结果报告如下。

Seasonal Suspended Particles Distribution Patterns in Western South Yellow Sea Based on Acoustic Doppler Current Profiler Observation

An Acoustic Doppler Current Profiler （ADCP） observation site was set up in the Western South Yellow Sea from 2012 to 2013 to study the local suspended particle matters （SPM） distribution pattern. The SPM concentration could be semi-quantitatively represented by backscatter intensity （Sv）, converted by the echo intensity （E/） of ADCP. Results show two types of SPM in the water column： the quasi-biological SPM and quasi-mineral SPM. The quasi-biological SPM mainly exists in summer half year and is con- centrated above the thermocline. It has periodically diurnal variations with high concentration at night and low concentration in the daytime. The quasi-mineral SPM is located in lower part of the water column, with similar relation to monthly tidal current variation all year round. However, the daily quasi-mineral SPM distribution patterns vary between summer and winter half year. The sunlight is thought to be the origin factor leading to the diurnally vertical motion of the biological features, which might cause the diurnal Sv variation. Unlike in winter half year when tidal current is relatively single driving force of the monthly SPM pattern, the high speed current near the thermocline is also responsible for the concentration of quasi-mineral SPM in summer half year. The sediment input difference between summer and winter half year contribute to the varied daily variation of quasi-mineral SPM with re-suspended SPM ir~ winter and sediments from Yellow Sea Mud Area （YSMA） in summer. The seasonal variations in hydrodynamics, water structure and heavy-wind incidents are the primary factors influencing the differential seasonal SPM distribution patterns.

Sclerosing cholangitis associated with autoimmune pancreatitis differs from primary sclerosing cholangitis

AIM:To clarify the characteristic features of biliary le-sions in patients with autoimmune pancreatitis(AIP) and compare them with those of primary sclerosing cholangitis(PSC) .METHODS:The clinicopathological characteristics of 34 patients with sclerosing cholangitis(SC) associated with AIP were compared with those of 4 patients with PSC.RESULTS:SC with AIP occurred predominantly in el-derly men.Obstructive jaundice was the most frequent initial symptom in SC with AIP.Only SC patients with AIP had elevated serum IgG4 levels,and sclerosing diseases were more frequent in these patients.SC pa-tients with AIP responded well to steroid therapy.Seg-mental stenosis of the lower bile duct was observed only in SC patients with AIP,but a beaded and pruned-tree appearance was detected only in PSC patients.Dense infi ltration of IgG4-positive plasma cells was de-tected in the bile duct wall and the periportal area,as well as in the pancreas,of SC patients with AIP.CONCLUSION:SC with AIP is distinctly different from PSC.The two diseases can be discriminated based on cholangiopancreatographic findings and serum IgG4 levels.

山西禹门口黄河大桥实测风特性分析

自然风特性研究是桥梁抗风设计的基础,但是目前国内对大气湍流特性的现场观测研究工作开展得还极少,针对这一情况,结合山西省禹门口黄河公路大桥,在桥址处建立了一座60 m和两座30 m的风观测站。利用自行编制的程序对实测风速数据进行了分析,得到了平均风速和风向、风剖面、湍流强度和阵风因子等强风特性。分析结果表明:桥位处的风场比较复杂,风剖面属于山区风速剖面,不完全遵守幂指数分布;桥位处出现28.3 m/s大风机率很大,应进行主桥最大双悬臂状态抗风安全性能的风洞试验,以确保主桥悬臂施工期间的安全;还应进行长期观测,得到更多详实资料,为掌握同类地形处的风场特性提供资料。