管道企业内部施工单位如何走入市场

管道企业内部施工单位如何走入市场（一）外部环境的变化１．完善市场机制。有关部门应尽快按着市场运行的客观要求，由法律、法规、制度规定一定的行为准则，即市场体制性规则和市场运行性规则，以保证各施工单位机会均等地参与招投标，防止不正当竞争，排除行政干预。２...     

结合景观的葡萄酒庄设计——以大连宝龙酒庄为例

通常,我们把酿造葡萄酒的场所称之为“酒庄”。而在早期的意大利,人们用“食堂”或是“酒窖”来指代,法国则一直用的“城堡”这个名称。这些名词之间的差异,不仅说明了葡萄酒酿造工艺的不断专业化：从建筑学的角度来看,正式这种差异的存在,揭示着酒庄建筑已经从传统的简单酿造场所,逐渐衍变成现代具有多个复合功能的综合葡萄酒建筑,同时对加工生产紧密相连的种植场地也起着改变作用,及葡萄种植园。     

Mobilization and deposition of iron nano and sub-micrometer particles in porous media: a glass micromodel study

Mobilization and deposition of iron nano and sub-micrometer particles (INSMP) in a porous medium were investigated using a water-saturated glass micromodel. The deposition and detachment of INSMP in the micromodel were visualized by taking serial images and experimentally verified by analysis of breakthrough curves. This first visualization study of INSMP fate showed that there were dense aggregations at the pores as the concentration of INSMP increased. The presence of dissolved humic substances (>1 ppm) significantly reduced deposition of suspended particles and enhanced detachment of the deposited particles. The mobility of INSMP in the presence of Pahokee peat fulvic acid standard II (PPFA) was higher than for Pahokee peat humic acid standard I (PPHA) due to the presence of more aromatic groups and the molecular weight in PPFA. Interfacial energy estimation based on the DLVO theory revealed that the adsorption of humic substances onto the INSMP increased the energy barrier and reduced the depth of secondary minimum between particles. The “affinity transition” in the initial deposition of INSMP within the micromodel was observed in the presence of Pahokee peat humic substances.     

Fabrication of silicon oxide nanodots with an areal density beyond 1 teradots inch(-2)

The combination of solvent annealing, surface reconstruction, and a tone-reversal etching procedure provides an attractive approach to utilize block copolymer (BCP) lithography to fabricate highly ordered and densely packed silicon oxide nano-dots on a surface. The obtained silicon oxide nano-dots feature an areal density of 1.3 teradots inch(-2) .     

Detecting oxidized contaminants in water using sulfur-oxidizing bacteria

For the rapid and reliable detection of oxidized contaminants (i.e., nitrite, nitrate, perchlorate, dichromate) in water, a novel toxicity detection methodology based on sulfur-oxidizing bacteria (SOB) has been developed. The methodology exploits the ability of SOB to oxidize elemental sulfur to sulfuric acid in the presence of oxygen. The reaction results in an increase in electrical conductivity (EC) and a decrease in pH. When oxidized contaminants were added to the system, the effluent EC decreased and the pH increased due to the inhibition of the SOB. We found that the system can detect these contaminants in the 5-50 ppb range (in the case of NO(3)(-), 10 ppm was detected), which is lower than many whole-cell biosensors to date. At low pH, the oxidized contaminants are mostly in their acid or nonpolar, protonated form which act as uncouplers and make the SOB biosensor more sensitive than other whole-cell biosensors which operate at higher pH values where the contaminants exist as dissociated anions. The SOB biosensor can detect toxicity on the order of minutes to hours which can serve as an early warning so as to not pollute the environment and affect public health.     

A new colour assay for [URE3] prion in a genetic background used to score for the [PSI⁺] prion

Most scoring assays for yeast prions are dependent on specific genetic markers and constructs that differ for each prion. Here we describe a simple colour assay for the [URE3] prion that works in the 74D-964 strain frequently used to score the [PSI(+)] prion. Although this assay can only be used to score for [URE3] in the [psi(-)] version of the strain, it makes it easier to examine the effects of host mutations or environmental changes on [URE3] or [PSI(+)] using a colour assay in the identical genetic background.     

Synthesis of BiFeO3/ZnO core-shell hetero-structures using ZnO nanorod positive templates

We report the synthesis, morphology, and magnetization characteristics of BiFeO(3) (BFO)-covered ZnO nanorod arrays (ZNAs). High quality and well-aligned ZNAs were grown by a hydrothermal method. BFO shells were deposited by sputtering at ambient temperature and then annealing in an oxygen atmosphere. The BFO shells crystallized to form a perovskite structure at 450?°C. Scanning electron microscopy and high resolution transmission electron microscopy demonstrated that the BFO shell was polycrystalline and randomly oriented, covering the ZnO nanorods well. The magnetization-magnetic field loops measured at 5 and 300 K indicate that the BFO/ZNA hetero-structure exhibits ferromagnetic order. The BFO/ZNA displays enhanced coercivity and saturated magnetization as compared with BFO thin films.