一种基于相关信息熵的多标签分类算法

在多标签分类中,标签之间的相关关系是一个重要的因素。为了利用标签之间的相关关系,文章提出了一种基于相关信息熵的多标签分类算法,使用相关信息熵来衡量标签之间相关关系的强弱程度。首先找出相关信息熵值最大的k标签组合的集合,然后使用LP(Label Powerset)分类器对每一个标签组合进行训练。在7个不同实验数据集上的实验结果表明:文中提出的算法的分类性能在其中的大部分数据集上优于其它对比的分类算法,而其它对比的分类算法仅在某一个数据集上优于文中提出的算法。     

利用柑桔加工废弃物制取糖蜜及乙醇

柑桔加工废弃物约占果实质量的50%,含大量糖分,适宜制备糖蜜和发酵生产乙醇.研究了用废弃物制取糖蜜及生产乙醇的工艺和条件.结果表明,柑桔皮渣制取糖蜜时,生石灰的适宜添加量为0.3%,制得的可溶性固形物为40%的糖蜜,总糖含量为34%.对pH值、糖度、接菌量和温度等影响发酵的主要因素做单因素研究基础上开展了正交试验,得到柑桔糖蜜发酵的较佳工艺条件为：发酵液的初始pH 5.0,初始含糖量25%,接种量3×107个/mL,温度保持在30℃,静置发酵.由此获得含量为10.6%的乙醇产品,为探索用柑桔糖蜜生产燃料乙醇提供了参考.     

弱耦合状态下的量子逻辑门和远距离量子态的转移（英文）

依据弱耦合状态下的量子点-腔系统,提出了1个控制Z门和1个条件相位门.利用这个控制Z门并且测量光子和第1个电子的状态,可以将这个量子态转移到第2个电子上,从而实现2个远距离量子点之间的远程量子态转移.这些方案都是在弱耦合状态下实现的,不需要对腔有严格的要求.     

Influence of surface roughness on flotation kinetics of quartz

Surface roughness of quartz particles was determined by measuring the specific surface area of particles. The wettability characteristics of particles were determined by measuring the flotation rate using a laboratory flotation cell. Experimental results show that the rod mill product has higher roughness than the ball mill product. For the particles with larger surface roughness, the flotation kinetics constant is also higher. Finally, empirical relationships between surface roughness (r) and the flotation kinetics constant (k) of quartz particles as k=A+Br+Cr ^0.5lnr+D/lnr+E/r and k=A+Br are presented, in which A, B, C, D and E are constants related to experimental conditions and mineralogical properties of mineral.     

Influence of subsequent curing on water sorptivity and pore structure of steam-cured concrete

Steam-cured condition is found to cause larger porosity and worse properties of concrete compared with normal curing condition. For the sake of seeking effective measurements to eliminate this bad effect of steam-cured condition on concrete, the water sorptivity and pore structure of steam-cured concretes exposed to different subsequent curing conditions were investigated after steam-curing treatment. The capillary absorption coefficient and porosity of the corresponding concretes were analyzed, and their mechanisms were also discussed. The results indicate that water sorptivity and pore structure of steam-cured concrete are greatly influenced by the curing condition used in subsequent ages. Exposure steam-cured concrete to air condition has an obviously bad effect on its properties and microstructures. Adopting subsequent curing of immersing steam-cured concrete into about 20 °C water after steam curing period can significantly decrease its capillary absorption coefficient and porosity. Steam-cured concrete with 7 d water curing has minimum capillary absorption coefficient and total porosity. Its water sorptivity is decreased by 23% compared with standard curing concrete and the porosity is 9.6% lower. Moreover, the corresponding gradient of water sorptivity and porosity of steam-cured concrete both decrease, thus microstructure of concrete becomes more homogeneous.     

SP32烟丝膨胀设备

所属单位北京航天凯恩化工科技有限公司产品简介该设备利用KC-2介质的物理特性,在一定的温度、压力、时间等综合工艺条件下,对烟丝进行浸渍,使介质浸入烟丝细胞中;浸渍后的烟丝输送到微     

水温分层对水库污染物输移的影响

水库温度分层使水库水动力特性及污染物输移过程异于均温型水库.采用三维非线性RNG浮力流模型对分层水库污染物输移的典型过程进行模拟,分析了水体分层条件对污染物输移的影响,探讨了不同分层条件下污染物在不同密度流流动区域射流区、交换区、潜流区的输移扩散规律.研究结果表明,水库分层条件对污染物输移有显著影响,污染物输移的分离点水深、交换区厚度、无量纲时间参数与水库分层强度成反比.研究结果可为水库水质、水生环境管理与调度、水库应急预警方案的制定提供参考.     

带负顾客的N策略启动时间的Geo/Geo/1工作休假排队

研究了正、负两类顾客的离散时间Geo/Geo/1多重工作休假排队模型,并加入N策略和启动时间,负顾客不接受服务,并只起一对一抵消队首正接受服务的顾客的作用,即服从RCH(Remove customer from head)策略。使用拟生灭过程及矩阵几何解方法得到队长的稳态分布,进一步得出了系统队长的随机分解的结果。     

龙门山北段KSL区块栖霞组生屑滩气藏特征

根据龙门山北段矿山梁地区钻井资料及实验数据,研究下二叠统栖霞组、烃源岩条件、储层特征及圈闭类型特征,认为栖霞组烃源条件丰富,储层主要发育裂缝-孔隙型储集层。储集空间以次生成因的晶间孔、晶间溶孔和溶洞为主。储层的形成与演化主要受沉积作用和成岩作用的影响。最有利于储层形成的沉积相带为台地边缘及台内的浅水高能生屑滩;最有利于储层形成的是白云岩化、溶蚀、破裂作用等建设性成岩作用,分析矿山梁地区油气成藏条件及富集规律。     

基于富氧条件的生物质颗粒燃烧特性实验研究

富氧燃烧是解决生物质能源直接燃烧温度低问题的重要方法.文章采用热重分析法分别对玉米、棉秆以及木屑进行燃烧特性试验,通过分析不同氧气浓度下三种秸秆的TG-DTG曲线,研究富氧条件对三种典型生物质颗粒燃料燃烧特性指数的影响.结果表明:富氧条件下三种生物质颗粒燃料燃尽温度区间比空气中减少近100℃,挥发分最大析出速率是空气中的2 ～2.75倍;富氧条件下,燃料的燃烧特性指数迅速上升,且玉米杆的上升幅度最大,表明富氧对玉米杆促进作用最强.