局部凸Hausdorff空间中的Drop定理和Drop性质

证明了局部凸H ausdorff空间中的一个D rop定理,提出了局部凸H ausdorff空间中的-τdrop性质、拟-τdrop性质和局部D rop性质.并证明τ-序列紧凸集具有-τdrop性质,τ-可数紧凸集具有拟-τdrop性质以及局部序列紧凸集都具有局部D rop性质.     

GPU加速的图像实时分形编码

图像分形编码压缩率大且质量较高,但实时性不好,因此难以推广应用.提出使用GPU对编码进行加速的方案.以图像FW算法为基础,在CUDA规范下,使用GPU并行地对图像中所有的待编码子树同时进行最优父树搜索.实验表明,该文编码方案在保持原有算法图像解码质量的情况下,可将编码时间缩短至毫秒级,满足了实时性的要求.     

软弱夹层力学参数取值规范分析

软弱夹层的工程地质性质既与地应力、地下水等环境条件有关,也与其成因性质、粒度成分和矿物成分等有关。试验研究了成因性质、颗粒组成及物质组成相同条件下,软弱夹层抗剪强度参数随含水量、性状指标(W/Wp)和干密度变化的关系,并建立了相关方程。结果表明：夹层强度随含水量和性状指标减小而增大,随干密度增大而增大。因此,在对具体工程的软弱夹层进行强度参数取值时要综合考虑夹层在原位条件下的含水量、颗粒组成、粘土矿物成分及所处的地应力环境等因素。并探讨了重力坝规范中仅用粒度成分定量指标选取软弱结构面抗剪强度参数存在的不足之处。     

Interferon-γ links ultraviolet radiation to melanomagenesis in mice

Cutaneous malignant melanoma is a highly aggressive and frequently chemoresistant cancer, the incidence of which continues to rise. Epidemiological studies show that the major aetiological melanoma risk factor is ultraviolet (UV) solar radiation, with the highest risk associated with intermittent burning doses, especially during childhood. We have experimentally validated these epidemiological findings using the hepatocyte growth factor/scatter factor transgenic mouse model, which develops lesions in stages highly reminiscent of human melanoma with respect to biological, genetic and aetiological criteria, but only when irradiated as neonatal pups with UVB, not UVA. However, the mechanisms underlying UVB-initiated, neonatal-specific melanomagenesis remain largely unknown. Here we introduce a mouse model permitting fluorescence-aided melanocyte imaging and isolation following in vivo UV irradiation. We use expression profiling to show that activated neonatal skin melanocytes isolated following a melanomagenic UVB dose bear a distinct, persistent interferon response signature, including genes associated with immunoevasion. UVB-induced melanocyte activation, characterized by aberrant growth and migration, was abolished by antibody-mediated systemic blockade of interferon-γ (IFN-γ), but not type-I interferons. IFN-γ was produced by macrophages recruited to neonatal skin by UVB-induced ligands to the chemokine receptor Ccr2. Admixed recruited skin macrophages enhanced transplanted melanoma growth by inhibiting apoptosis; notably, IFN-γ blockade abolished macrophage-enhanced melanoma growth and survival. IFN-γ-producing macrophages were also identified in 70% of human melanomas examined. Our data reveal an unanticipated role for IFN-γ in promoting melanocytic cell survival/immunoevasion, identifying a novel candidate therapeutic target for a subset of melanoma patients.     

传递矩阵方法与矩形势垒的量子隧穿

利用传递矩阵方法精确计算了一维定态薛定谔方程,求解出电子穿过矩形势垒的透射系数,进一步研究了该透射系数与有效质量和矩形势垒参数的关系。数值计算结果表明,有效质量和矩形势垒参数对透射系数的影响同等重要。     

钱家营矿选煤厂重选方案优化

在对钱家营矿原煤特性分析的基础上,利用选煤优化软件进行计算机优化,得出钱家营矿选煤厂重力分选最佳方案:各层煤单独分选出不同的精煤产品或采用选后配煤的方法将单独分选出的产品混合,以获得用户要求的产品.该方案比混合分选或混合后分级入选精煤产率高,可为选煤厂带来更好的经济效益.     

城市市政基础设施投资与经济发展的空间交互影响

通过空间联立方程模型,基于2011和2016年241个城市样本数据,研究城市市政基础设施投资与经济发展的双向互馈及其空间相互作用.结果表明:1)考虑内生性后,基础设施投资的空间滞后项系数显著为正,地方政府在投资行为上模仿彼此;2)基础设施投资与经济发展之间存在双向互促作用.建议加强对基础设施投资的预算管理,改革晋升绩效...