Magnesium nanoparticles were synthesized by using organo magnesium precursor. By changing synthesis parameters such as synthesis time and temperature, various morphologies of the magnesium nanoparticles were obtained. Sample synthesized at 250℃ for 30 min exhibited agglomerated nano-sheets of magnesium whereas the sample obtained at 2 hour had individual particles consisted of core/shell structure. The corresponding hydrogen storage properties of these samples were also influenced by the morphology. Hydrogen desorption data revealed that samples prepared at 2 hour could release hydrogen at lower temperature (343℃) than those samples prepared at 30 min and 1 hour.

关键词：储氢；核/壳结构；合成；镁纳米颗粒

查看摘要 索取原文[7页]

2013年我国磷肥产量（以P2O5计，下同）1649万吨，比上年下降2.6%，是继2008年以来的首次下降。其中高浓度磷复肥产量1458万吨，占磷肥总产量的88.4%；低浓度磷肥产量191万吨，其中过磷酸钙（SSP）169万吨，钙镁磷肥（FMP）22万吨。2013年磷酸二铵（DAP）实物产量为1544万吨，同比增长5.8%；磷酸一铵（MAP）实物产量1168万吨，同比下降12.1%；重钙（TSP）实物产量93.8万吨，同比下降11.8%；NPK复混肥年产量约6200万吨。2006年以来，我国磷肥产量年均增长率4.5%，除了2008年和2013年外，均保持上涨的态势。

关键词：磷肥；硫资源；生产运行；发展趋势

查看摘要 索取原文[8页]

关键词：橡胶业；路线图

查看摘要 索取原文[1页]

Theoretical studies of the possibility of forming ammonia electrochemically at ambient temperature and pressure are presented. Density functional theory calculations were used in combination with the computational standard hydrogen electrode to calculate the free energy profile for the reduction of N2 admolecules and N adatoms on several close-packed and stepped transition metal surfaces in contact with an acidic electrolyte. Trends in the catalytic activity were calculated for a range of transition metal surfaces and applied potentials under the assumption that the activation energy barrier scales with the free energy difference in each elementary step. The most active surfaces, on top of the volcano diagrams, are Mo, Fe, Rh, and Ru, but hydrogen gas formation will be a competing reaction reducing the faradaic efficiency for ammonia production. Since the early transition metal surfaces such as Sc, Y, Ti, and Zr bind N-adatoms more strongly than H-adatoms, a significant production of ammonia compared with hydrogen gas can be expected on those metal electrodes when a bias of - 1 V to - 1.5 V vs. SHE is applied. Defect-free surfaces of the early transition metals are catalytically more active than their stepped counterparts.

关键词：制氢；N-2过渡金属；电催化剂；理论评价

查看摘要 索取原文[22页]

The HHE Program evaluated surface contamination from spills of sea lamprey pesticides that occurred in the 1960s and 1970s at a biological station. HHE Program investigators took samples of carpet that were thought to have been contaminated with pesticide and took wipe samples from surfaces. Yellow stains were seen on carpet, walls, and unsealed concrete floors. The carpet had been installed over unsealed concrete. Pesticide was found on the carpet and wipe samples from areas that were visibly stained. HHE Program investigators recommended that the stained carpet be removed and that the concrete slab floor be cleaned and sealed prior to the installation of new flooring. Walls that had visible stains should be cleaned, sealed, and repainted. Investigators also measured temperature, relative humidity, carbon monoxide, and carbon dioxide and checked the heating, ventilation, and air-conditioning system in the offices and laboratory. Room air flowed from the offices into the workshop which helped keep potentially contaminated air from entering the office space. The exhaust fan in the laboratory solvent storage room was not always turned on which allowed air to flow into the nearby laboratory. This fan should be run continuously to reduce the amount of solvent vapors that can enter nearby work areas. Investigators recommended that the employer stop sampling soil and concrete that may have been contaminated during past spills. Employees were encouraged to wash their hands with soap and water after handling pesticides and avoid touching surfaces that are visibly stained. Employees should not go into offices while wearing clothes, shoes, or materials that may have pesticides on them. Investigators also recommended that the employer notify all employees about plans to renovate the building and follow up with employees after projects are completed to ensure that these activities have eliminated visible pesticide contamination on carpet, floors, and walls.

关键词：农药；健康风险；农药污染；生物站；海七鳃鳗

查看摘要 索取原文[22页]

关键词：页岩气；勘探开发；总结与展望

查看摘要 索取原文[1页]

关键词：化肥产业；新型肥料；转型

查看摘要 索取原文[1页]

关键词：2014；500强；化工企业

查看摘要 索取原文[1页]

Organic chemistry laboratory courses present exceptional opportunities to teach students how to utilize NMR to its fullest potential. When implementing experiments that use NMR to analyze products in the undergraduate teaching lab a number of practical problems arise, even with the use of an automated instrument. The pertinent issues in our situation involve sample submission timing, data transfer, and spectra processing. This chapter addresses what can be done to alleviate those problems using a newly designed experiment incorporating flow hydrogenation that has been incorporated into our organic laboratory sequence. Solutions include having a teaching assistant present by the NMR spectrometer room as students are submitting their samples, using Dropbox as a versatile approach to distributing and accessing data, and that iNMR reader is a flexible solution for students to process their data.

关键词：加氢；核磁共振；有机化学；实验

查看摘要 索取原文[8页]

关键词：发改委；油气行业；运行情况

查看摘要 索取原文[1页]