低渗透气藏气液两相非线性渗流模型研究

实验室研究和实际开发效果证明低渗透气藏在成藏机理上与中高渗透气藏存在较大差别,在储层内部,流体的渗流规律也与中高渗透气藏有较大差别.因此,提出一个新的非线性渗流模型,并建立相应的非线性渗流数学模型.该模型包括了储层中由于液相的存在而形成的边界层以及启动压力的影响,认为在低渗透气藏中流体的流动大部分属于非线性流动,储层中液相的存在对气相的影响是不能忽略的.     

陕西户县社火的体育文化价值探析

户县社火融合民间戏剧、民间音乐、民间舞蹈、民间美术、民间杂技、民间锻造技艺等各门类艺术,是我国优秀的民间民俗体育艺术活动.文中采用文献资料、田野调查等方法,从陕西户县社火的历史渊源入手,探析户县社火的体育文化价值,使该非物质文化遗产得到保护和传承.     

淤地坝增产效益监测分析

选择山西省河曲县树儿梁小流域坝系,通过调查与布设样地监测相结合的方法,2006—2010年连续5 a观测在相同条件下,坝地、梯田及坡耚地土壤含水量、碱解氮含量、速效磷含量和速效钾含量在玉米不同发育期的变化情况,获取了淤地坝增产效益与土壤养分监测数据。结果表明:5 a中坝地、梯田、坡耕地的平均产量分别为6 129.45、4 596.95、3 515.01 kg/hm2;在土壤含水量方面,不同发育期都是坝地>梯田>坡耕地;不同发育期土壤有机质含量、碱解氮含量、速效磷含量和速效钾含量也都是坝地>梯田>坡耕地。     

物探地震队工人饮食营养现状与建议

物探地震队工人由于职业的特殊性,工作、生活环境较为艰苦,饮食工作一直存在着缺乏科学指导、监督和管理,饮食营养搭配不合理,烹调制作不当等问题。为了改善物探地震队工人饮食营养状况,应配备专业营养师;根据野外作业工人所处的环境,制定合理实用的食谱,按计划采购原材料。同时,改变烹调方法与配送模式,加强食品安全教育。     

Synthesis of nanocrystalline MMoO4 (M = Ni,Zn) phosphors via a citrate complex route assisted by microwave irradiation and their photoluminescence

Nanocrystalline MMoO₄ (M = Ni, Zn) phosphors, which have wolframite-type structure, were successfully synthesized at low temperatures via a modified citrate complex route assisted by microwave irradiation. The citrate complex precursors were heat-treated from 300 to 600 °C for 3 h. Crystallization of the MMoO₄ (M = Ni, Zn) nanocrystallites were detected at 500 °C, and entirely completed at a temperature of 600 °C. The nanoparticles presented primarily dispersed and homogeneous morphology with particle size of 20–40 nm. The nanocrystalline MMoO₄ (M = Ni, Zn) phosphors prepared at 600 °C exhibited broad luminescence in green and blue wavelength region, respectively.     

Simple and green oxidation of cyclohexene to adipic acid with an efficient and durable silica-functionalized ammonium tungstate catalyst

A novel silica-functionalized ammonium tungstate interphase catalyst has been reported as a non-nitric acid route for adipic acid production from one-pot oxidative cleavage of 30% hydrogen peroxide and catalytic amounts of p-toluenesulfonic acid (PTSA). The catalyst has been simply prepared by commercially available starting material. The structure of the catalyst has been investigated using FT-IR spectroscopy, atomic absorption, TEM, SEM and XRD analysis. The catalyst has shown good to high activity even up to 10 runs of reaction. Simple preparation of the catalyst, avoids using harmful phase transfer catalyst (PTC) and/or chlorinated additives are among the other benefits of this work.     

“肢障皮鞋”设计研究

通过对我国肢障患者的相关数据分析,可以看出目前肢障患者数目巨大,且具有加速增长的趋势,并归纳出"肢障皮鞋"设计研究的价值与意义。通过实例说明,证明了"肢障皮鞋"的便利性、自由性和实用性,进而得出结论:"肢障皮鞋"的设计研究具有可行性、紧迫性和经济性。     

Facile fabrication of a binary NiCo phosphide with hierarchical architecture for efficient hydrogen evolution reactions

Exploring and designing efficient non-noble catalysts formed by element doping and nanostructure modification for the hydrogen evolution reaction (HER) is of critical importance with respect to sustainable resources. Herein, we have prepared a three-dimensional binary NiCo phosphide with hierarchical architecture (HA) composed of NiCoP nanosheets and nanowires grown on carbon cloth (CC) via a facile hydrothermal method followed by oxidation and phosphorization. Due to its unique hierarchical nanostructure, the NiCoP HA/CC electrocatalyst exhibits excellent performance and good working stability for the HER in both acidic and alkaline conditions. The obtained NiCoP HA/CC shows excellent HER activity with a low potential of 74 and 89 mV at 10 mA cm⁻², a small Tafel slope of 77.2 and 99.8 mV dec⁻¹ and long-term stability up to 24 h in acidic and alkaline electrolyte, respectively. NiCoP HA/CC, a non-noble metal material, is a promising electrocatalyst to replace noble metal-based electrocatalysts for the HER.     

Hybrid CO2 laser waterjet heat (LWH) treatment of bindered boron nitride composites with hardness improvement

Boron nitride (BN) material is chemically and thermally stable which makes it desirable for high speed machining in demanding chemical and thermal environments. Although the hardness of BN material is well below that of single polycrystalline diamond (PCD), a laser waterjet heat (LWH) treatment process provides a new potential approach to achieve hardness values that are comparable to diamond hardness. This study investigates the hardness change of LWH-treated bindered cBN/TiN and cBN/AlN composites. Results indicate that measured hardness increase is dependent on the laser beam pass and the distance from the beam center.     

新型双季铵盐杀菌剂的合成及其杀菌性能研究

以乙二胺、甲酸、甲醇和氯乙酸乙酯为原料,合成了双季铵盐杀菌剂,以绿藻为模型,探讨了双季铵盐的浓度和投加时间对其杀菌性能的影响。结果表明,当双季铵盐的浓度为0.3 g/mL时,杀菌效果较好,3 d可实现79.25%的杀菌率,且投加时间越长,灭菌效果越显著。