新型城镇化的城镇群战略解析

我国城市群的发展都还停留在基础建设阶段,在能够推动实质性的经济发展方面还存在严重不足,多数城市群其实只是在空间分布上相对集中的“一群城市”,而不是具有核心竞争力的“城市群”。在新型城镇化过程中,提升小城镇之间的勾连效率、提升城市群的核心竞争力是推动我国城镇化发展的重要课题。     

保障性住房的公共服务体系建构

通过对保障性住房目标人群的居住需求分析归纳出:居住需求可根据时间分为“永久性”与“非永久性”;居住空间可根据功能分考“核心”与非核心”功能空间:基于预期需求的住宅产品价值消费具有被动性特点.在此基础上,结合我国保障性住房建设的约束性条件,提出若干保障性住房的公共服务功能建设构想.     

谈如何控制路基压实

分析了影响路基压实的因素,并从含水量、土质、压实厚度等方面进行了论述,探讨了有效控制路基压实度的注意事项,以选用正确的施工方式,确保路基压实质量满足设计要求。     

产业性城市中小企业簇群的培育

针对一些产业性城市目前面临着产业衰败导致城市衰败的威胁，探讨通过培育中小企业簇群实业产业性城市的产业整合，提升城市的竞争力。     

Sintering Behavior and Dielectric Properties of Ultra‐Low Temperature Fired Silver Molybdate Ceramics

Ag₂MoO₄ ceramic was prepared by using the solid‐state reaction method, which could be sintered at 450°C for 2 h, having a relative permittivity of 8.08, a Qf value of 17 000 GHz, and a temperature coefficient of resonance frequency about ?133 ppm/°C. Ag₂MoO₄ ceramic was chemically compatible with silver but reacted seriously with aluminum to form (Ag_0.5Al_0.5)MoO₄ during the sintering. The fitting of infrared spectra and the Shannon's additive rule were employed to study intrinsic dielectric behaviors of the ceramics at microwave region. Ionic displacive polarization and the electronic polarization contributed almost equally to the dielectric permittivity of the ceramic at microwave region. The Ag₂MoO₄ ceramics could be a good candidate for ultra‐low temperature co‐fired microwave devices.     

1-氨基-2-(N,N-二甲氨基)-4-羟基-蒽醌的合成新方法

以分散红60和DMF为原料,在碳酸钾作用下反应制备得到1-氨基-2-(N,N-二甲氨基)-4-羟基-蒽醌,产品收率92.8%。     

Sterols from Mytilidae Show Anti-Aging and Neuroprotective Effects via Anti-Oxidative Activity

For screening anti-aging samples from marine natural products, K6001 yeast strain was employed as a bioassay system. The active mussel extract was separated to give an active sterol fraction (SF). SF was further purified, and four sterol compounds were obtained. Their structures were determined to be cholesterol (CHOL), brassicasterol, crinosterol, and 24-methylenecholesterol. All compounds showed similar anti-aging activity. To understand the action mechanism involved, anti-oxidative experiments, reactive oxygen species (ROS) assays, and malondialdehyde (MDA) tests were performed on the most abundant compound, CHOL. Results indicated that treatment with CHOL increases the survival rate of yeast under oxidative stress and decreases ROS and MDA levels. In addition, mutations of uth1, skn7, sod1, and sod2, which feature a K6001 background, were employed and the lifespans of the mutations were not affected by CHOL. These results demonstrate that CHOL exerts anti-aging effects via anti-oxidative stress. Based on the connection between neuroprotection and anti-aging, neuroprotective experiments were performed in PC12 cells. Paraquat was used to induce oxidative stress and the results showed that the CHOL and SF protect the PC12 cells from the injury induced by paraquat. In addition, these substance exhibited nerve growth factor (NGF) mimic activities again confirmed their neuroprotective function.     

Synthesis of 3D graphene/MnO2 nanocomposites with hierarchically porous structure for water purification

Journal of Porous Materials - In this work, a three-dimensional (3D) graphene/manganese dioxide nanocomposite (PGA/MnO2) with a hierarchically porous structure was prepared by facile steam...     

浅谈人事档案管理

随着我国经济、政治体制的不断改革与深入,我国的人事档案出现了许多新的问题。为了改善这种情况,使得人事档案管理工作能够顺利地开展、与时俱进,更好地为人们服务,笔者结合多年的档案管理工作的经验,为人事档案管理提出了几条建议。     

填海地区复杂地质条件下的混凝土灌注桩施工技术

本文以深圳市后海片区百丽大厦项目混凝土灌注桩为例,分析并介绍了填海造陆地区复杂地质条件下的混凝土灌注桩技术,希望为类似工程施工提供参考。