新型环保PESA钨酸钠复合配方缓蚀阻垢剂的研究

以电厂的循环冷却水为主要对象,通过检测其水质,分析水质特点,选择PESA/钨酸钠等复合配方进行静态阻垢实验旋转瓜片腐蚀实验,结果表明该复合缓蚀阻垢剂配方在不同温度下都保持较高的阻垢性能。     

Generation of polarization-entangled photon pairs in a cold atomic ensemble冷原子系综中偏振纠缠光子对的产生

We report an experimental generation of polarization-entangled photon pairs in a cold atomic ensemble. A single Stokes photon and one spin-wave excitation are simultaneously created via spontaneous Raman scattering. The spin-wave excitation is then converted into an anti-Stokes photon via an electromagnetic-induced-transparency reading process. The measured cross-correlation functions between the Stokes and anti-Stokes photons for two orthogonal polarizations are ~75 and 74, respectively, at a generation rate of the photon pair of ~60/s. Based on such correlations, we obtain polarization-entangled photon pairs, whose Bell parameter is S = 2.77 ±0.01, violating Bell-CHSH inequality by ~77 standard deviations. The presented polarization-entangled photon source has high entanglement degree and fast generation rate, which will promise us to apply it in future quantum repeater.     

Identification of the thick-layer greigite in sediments of the South Yellow Sea and its geological significances

Magnetic minerals in sediments of the continental shelf are sensitive to environmental changes. Therefore, to determine the exact phases of magnetic minerals is the prerequisite to investigate the paleoenvironmental significances. In this study, a comprehensive rock magnetic investigation, coupled with mineralogical studies, was carried out on the long core NHH01 （with a length of 125.64 m） from the central continental shelf of the South Yellow Sea. Single-domain greigite was identified as the dominant magnetic carrier in sediments between 44.90 and 51.80 m, and terrigenous magnetite is the major magnetic phase in the adjacent layers. The existence of greigite unambiguously indicates an anoxic environment. We tentatively interpreted that such an environment could be formed by the fast sea level changes, longexisting of the cold eddies during warm stages, or in a lake which might be related to locally tectonic uplifting. Therefore, the occurrence of the thicklayer greigite could supply a new perspective to paleoenvironmental or even tectonic studies.     

LBE–DEM simulation of inter-phase heat transfer in gas–solid cross jets

Lattice-Boltzmann equation(LBE)–Discrete element method(DEM)coupled simulation of a twodimensional gas–solid cross jet is performed,focusing on the gas-particle two-way coupling effect on heat transfer characteristics.The Reynolds number is 1000,and particle Stokes numbers are 10,25,and 50 under the same number flow rate of particles.The gas phase temperature field and particle distribution as well as the inter-phase heat transfer characteristics are studied and analyzed.The dominating effects,i.e.the mean temperature difference and mean heat transfer coefficient between the gas–solid phases,for the pre-and post-collision stages of the cross jets are illustrated respectively.The change of dominating roles is related to the dynamical response characteristics of particles.     

不同发酵阶段作物秸秆生物基质理化性质变化研究

利用自制设备对玉米秸秆进行发酵处理,通过塔内发酵和场内发酵两个过程,进行基质的制备和理化性质测定.结果表明,玉米秸秆经发酵处理后,其容重、持水孔隙度增加,总孔隙和通气孔隙减小,基质的固持作用和持水性增强,使不稳定的营养成分变得相对稳定,基质的可溶性盐分的浓度得到提升,使秸秆本身的毒素物质以及病虫源得到分解和杀灭,更有利于育苗的需要;发酵过程中添加不同比例的鸡粪、尿素和发酵菌,是加快发酵速度和提升基质生物活性的必要措施,有利于发挥设备的性能.     

地震台站科研难点研究

通过对河南省地震局直属台站监测、预报、科研等方面存在的管理难点进行解析,提出解决思路,为管理者更好的优化管理措施提供解决思路,促进台站效能产出。     

自学考试本科论文预申请管理系统设计

对自考生的考籍进行有序管理一直是自学考试工作的重要部分.一些学校自考生在籍考生人数众多,考籍管理工作非常复杂.随着自考生报考数量逐年增加,论文申请、毕业申请人数迅速上升,受理各类申请的工作压力也越来越大.建设网上论文预申请管理系统,充分利用信息化平台,对论文申请资格进行自动预审核,可以减轻工作压力,提高工作效率,同时还可以对考生考籍信息进行数据处理和分析,为自考专业的发展、政策的制定提供数据支持.     

Research on a toolpath generation method of NC milling based on space-filling curve

Tool path generated by space-filling curve always turns frequently causing trembling to ma-chine, reducing toollife and affecting workpiece quality.Length and generation time of tool paths are both relatively long.In order to solve these problems, a toolpath generation method of NC milling based on space-filling curve is proposed.First, T-spline surface is regarded as the modeling sur-face, the grid, which is based on the limited scallop-height, can be got in the parameter space, and the influence value of grid node is determined.Second, a box is defined and planned, and the tool paths are got preliminarily,which is based on minimal spanning tree;Finally, based on an improved chamfering algorithm, the whole tool paths are got.A simulation system is developed for computer simulation, and an experiment is carried out to verify the method.The results of simulation and ex-periment show that the method is effective and feasible, and length and time of the tool paths are re-duced.     

Controllability of Singular Distributed Parameter Systems in the Sense of Mild Solution

Necessary and sufficient conditions for the exact controllability and approximate controllability of a singular distributed parameter system are obtained. These general results are used to examine the exact controllability and approximate controllability of the Dzektser equation in the theory of seepage.