一类次线性Hamilton系统的次调和解

运用极小极大方法得到一类局部强制的次线性Hamilton系统的次调和解的存在性定理.     

吉安市中心城区规划建设现状与对策分析

随着城市化进程加快和城市经济的发展,城市规划在城市建设中的龙头指导作用愈显重要.本文针对吉安市中心城区规划建设现状,分析了其规划建设存在的主要问题并提出了相应的对策,以促进城市建设良性、可持续发展.     

激光皮肤治疗技术研究

利用激光对病损组织进行修复的皮肤整形过程,激光对皮肤的治疗,不仅可治愈各种胎记,也能治疗雀斑、纹身、眼眉色斑及鲜红斑痣等多种皮肤病,可为不同年龄的患者,包括老年人与婴儿作治疗.能够解决色素增生类和血管类皮肤病,改善或恢复先天造成的容貌和外表缺陷.激光对皮肤的治疗技术与传统的疗法相比具有出血少、痛苦小、手术质量高、手术时间短、疤痕少和复发率少等优点,是一种科学、快速、安全有效的美容方法.     

紫外分光光度法测定药物雷洛昔芬

在pH1.4～2.4的NaAc HCl酸性缓冲介质中,药物雷洛昔芬与依文思蓝作用,形成离子缔合物,在280nm处产生强吸收。在此波长处吸光度A与雷洛昔芬浓度在0～2.3×10-5mol·L-1范围内,遵守比耳定律。建立了测定雷洛昔芬的分光光度法,测得表观摩尔吸光系数ε280达1.84×104L·mol-1·cm-1。该方法操作简便快捷,灵敏度较高,体系稳定。用于合成样中雷洛昔芬的测定,结果满意。     

Cryptomelane（KxMn8-xO16）： Natural active octahedral molecular sieve（OMS-2）

The Xiangtan manganese deposit (XTM) used to be considered a supergene oxide manganese ore in South China. We reported a new identification of the naturally outcropping cryptomelane by examining the physical, chemical and structural features of the XTM supergene oxide manganese ore. The MnO2 content was over 90%, K2O more than 3%, and water from 2.2%-3.1% which is similar to one in zeolite. The cell parameters of the cryptomelane were given as a0 = 0.9974 nm, b0 = 0.2863 nm, c0 = 0.9693 nm and β= 91.47°. There was a larger pseduotetragonal tunnel in the natural cryptomelane that was formed by [MnO6] octahedral double chains with aperture of 0.462×0.466 nm2, filled with K cations resulting in some Mn3+ substituting for Mn4+ to balance the negative charges of structure. The finding is important not only for prospecting manganese resources in South China, but also in application of octahedral molecular sieve of natural cryptomelane as that developed in the tetragonal molecular sieve of natural zeolite o     

A complete sequence and comparative analysis of a SARS-associated virus(Isolate BJ01)

Severe Acute Respiratory Syndrome (SARS) is a newly identified infectious disease[1—5]. The global outbreak of SARS has been threatening the health of people worldwide and has killed 353 people and infected more than 5462 in 27 countries, as reported by WHO on April 29, 2003 (http://www.who.int/csr/sarscountry/en). Although it has been recognized that a variant of virus from the family of coronavirus might be the candidate pathogen of SARS[1—5], its identity as the unique pathogen sti…     

SARS流行与中国都市化的反思

SARS病毒在中国一些高都市化区域的高发 ,叫人不得不重提都市化这一老生常谈的问题。大都市里的居民难于呼吸到新鲜空气的原因有三个方面 ,即目前城市的建筑有缺陷 ,许多大都市空气的自我更新能力在逐步弱化 ,且与外围的空气缺少互动性。并结合有关专家的看法 ,提出了几点改进意见。     

Climatic significance of stable carbon isotope in tree rings of Abies spectabibis in southeastern Tibet

The annually cross-dated stable carbon isotope of tree-ring a-cellulose of Abies spectabibis collected from the southeastern Tibetan Plateau is used to examine its rela-tionship with climatic parameters. The residual D13C series in treerings is constructed after removing the effects of age trend and rising CO2. We found a close relationship between D13C in tree rings and the relative humidity of September—November of the previous year measured at the nearby Ny-ingchi Meteorological Station, albeit a strong 搇agged effect? Thus we developed a transfer function to reconstruct the autumn relative humidity for the Nyingchi region, which explained 37.9% of the total variance (p < 0.001). Our results suggest a high frequency and moderate amplitude variance of the relative humidity before 1800, and the variance re-versed afterwards.     

土工格栅加筋路堤的三维有限元分析

运用通用有限元程序ANSYS ,对软弱地基上路堤加筋的作用和效果进行了三维有限元分析 .计算中采用DP模型模拟土体的材料非线性 ,采用面—面接触单元考虑筋土界面的状态非线性 ,并采用薄膜单元来模拟土工格栅 .通过对相关参数的敏感性分析 ,证明了土工格栅模量对加筋效果有显著影响 ,并且加筋位置靠近路堤底部时更能发挥加筋性能 ;证明了在土体发生显著侧向变形时土工格栅能够发挥抗拉效果 ,从而限制土体侧向变形和路堤外侧土体的隆起 ,达到减小沉降和不均匀沉降的效果 .研究成果对软弱地基路堤加筋处理和新老路基结合部处理均有借鉴意义     

新疆城乡居民两周就诊影响因素的分析

利用新疆维吾尔自治区卫生服务家庭入户调查数据，采用多因素logistic回归模型分析15岁及以上城乡居民两周就诊影响因素，结果表明：在控制居民健康状况时，性别、婚姻状况、文化、职业、收入、恩格尔系数及是否患慢性病对城市居民的就诊概率有统计学意义。农村居民两周就诊受到性别、年龄、婚姻状况、恩格尔系数、就诊距离及是否患慢性病等因素的影响。