展形的上界与下界估计

展形是一个重要且独特的代数特征量，它主要用于刻画特征值分布的稠密性。首先给出实对称矩阵展形的新的下界估计，然后给出 Toeplitz 矩阵、 Hankel 矩阵与循环矩阵的展形的上界估计，其结论是对已有结论的扩展。     

新型的甘油骨架上含硫的替加氟硫代磷脂缀合物合成与活性研究

氢氧化钾存在下，异丙醇／水作溶剂，室温下硫酚对替加氟的环甘油硫代磷脂缀合物发生亲核开环，高产率的得到新型的甘油骨架上含硫的替加氟硫代磷脂缀合物，经抗肿瘤活性测定，目标化合物具有良好的对人体膀胱癌细胞T-24和胃癌细胞BGC-823抑制作用．     

海上稠油油藏蒸汽吞吐注采参数正交优化设计

以渤海油田某稠油油藏为典型区块,根据海上油田特点建立基础方案,运用正交试验设计和数值模拟方法对该区块蒸汽吞吐过程中的注汽强度、注汽速度、井底蒸汽干度、蒸汽温度、焖井时间和产液速度进行研究,并采用直观分析法和方差分析法对试验结果进行分析。结果表明,该区块蒸汽吞吐的最优生产方案为注汽强度为20 t/m,注汽速度为250 m 3/d,井底蒸汽干度为0.5,蒸汽温度为340 ℃,焖井时间为5 d,产液速度为200 m 3/d,并得到了各注采参数对开发效果的影响程度大小依次为注汽强度>井底蒸汽干度>产液速度>注汽速度>蒸汽温度>焖井时间。该结果对于海上矿场蒸汽吞吐注采参数的优化具有一定的指导意义。     

A CONSTITUTIVE LAW FOR CYCLIC BEHAVIOR OF A CLASS OF TWO-PHASE STEELS

Based on a thermomechanically consistent mechanical model, the constitutive law for a class of complex two-phase materials with locking-in inter-phase residual stress capability is proposed. The developed model contains the current plastic strain in its hereditary integral so that the main features of the above materials subjected to cyclic loading can be well described. The developed model can include both the endochronic constitutive equation and Bower' s empirical formula as special cases. The cyclic plasticity and ratcheting of OFHC copper (single-phase material) and rail steel BS1l(two-phase material)are analyzed and compared with experimental results     

干湿循环过程中壤质黏土干缩裂缝的开闭规律

为研究干湿循环过程中农田土壤干缩裂缝的开闭规律,在室内试验的基础上,结合数字图像处理技术对壤质黏土干湿循环过程中土壤干缩裂缝网络几何形态特征进行了定量分析。结果表明:干燥过程中土壤含水率随试验时间的变化经历3个阶段。增湿过程中,含水率达到45%时裂缝完全闭合;裂缝面积率、长度密度、面积周长比与连通性指数分别在含水率增加到30%、32%、30%、35%时开始迅速减小。裂缝开裂与闭合是2个不可逆的过程。土壤水分在田间持水率和凋萎系数时裂缝几何参数统计表明,大多数裂缝面积在0~30 mm2之间,长度在0~40 mm之间。从田间持水率干燥到凋萎系数的过程中,裂缝面积与长度的频数分布均显著变化,从凋萎系数增湿到田间持水率的过程中,频数分布几乎没有变化。土壤含水率为凋萎系数时,干燥过程与增湿过程面积、长度的频数分布差异较小,而为田间持水率时差异明显。该成果有助于土壤干缩裂缝开闭机理及裂缝优先流的研究,为基于裂缝网络的精量灌溉制度的制定提供理论基础。     

南京附近下蜀土中黄土层与古土壤层的差异性探讨

Xiashu loess strata are widely distributed along the middle-lower reaches of the Yangtze River in East China with the stratum near Nanjing, Jiangsu Province being typical. The cyclic variability of the stratum was investigated through comparison of geological features, chemical composition, and swelling-shrinkage properties between the loess and the paleosol layers. Based on the investigation of such a cyclic variability, soil behavior associated with the unsaturated state of the Xiashu loess stratum and its usefulness for geotechnical design and construction in the Nanjing area was analyzed. The stratum consisted of two types of cyclically alternating soil layers, namely the loess and the paleosol layers, which was the major cause for its cyclic variability. The loess and the paleosol layers were formed in different sedimentary environments. In order to avoid detrimental results from the differential engineering properties between them, this study suggested for the practitioners the importance of inspecting the variation of water content and controlling the downward net fluxes during geotechnical construction in the Nanjing area.     

论以沼气为龙头的农村循环经济发展模式

为了解决“三农”问题，开创农业、农村工作新局面，织金县以沼气为龙头，探索形成了“绿肥-养殖-沼气-种植”为一体的农村循环经济发展模式，达到变废为宝、循环利用、节约能源、优化环境的目的，从而提高资源利用效率，促进生态的良性循环，实现可持续发展。     

Effect of Qing-Kai-Ling Injecta on cAMP content of hypothalamus and AVP content in ventral septal area of endotoxin-induced febrile rabbits

AIM:To investigate the mechanism of Qing-Kai-Ling(QKL) Injecta suppressing endotoxin(ET)-induced fever in rabbits.METHODS:①The ET-induced fever model was established in rabbits. QKL injecta was administered intravenously, and the febrile response of rabbits was observed. The cAMP content in the hypothalamus (HP) and arginine vasopressin (AVP) content in the ventral septal area (VSA) were determined by radioimmunoassay.RESULTS:①The maximal increment in body temperature (△T) ,6 h thermal response index (TRI₆)(29.59±10.39), cAMP content in the HP and AVP content in the VSA in the ET group were significantly higher than those in the normal saline (NS) group and the QKL+ET group .②The positive correlation was observed between the cAMP content in the HP and the fluctuation of body temperature (r=0.904,P＜0.01).CONCLUSION:The antipyretic mechanisms of QKL were probably due to inhibiting the increase in cAMP content in HP, and meanwhile stimulating the release of AVP in VSA.