The adsorption and interaction of long-chain fatty acids and heavy metals at the mercury electrode/sodium chloride solution interface     

Damir Krznarić  Boẑena Ćosović  Zlata Kozarac 《Marine Chemistry》1983,14(1):17-29

The reduction of heavy metals (cadmium, lead and zinc) in the presence of long-chain fatty acids (lauric, oleic and linoleic) in 0.55 mol dm^?3 NaCl and 0.03 mol dm^?3 NaHCO₃ at pH 8.7 has been studied by differential pulse polarography. The increase of the peak height of investigated metals by up to tenfold the value obtained in electrolyte without fatty acid is due to adsorption of metal ions at the electrode surface. The accumulation of metal increases with the increase of adsorption time (at potentials more positive than the reduction potential of the particular metal) and with increase of salinity. The heavy-metal adsorption depends on the concentrations of both metal ions and fatty acids. The interaction of heavy metals with the unsaturated fatty acids in the bulk and/or in the adsorbed layer at different natural interfaces could be of considerable importance in an understanding of the fate and distribution of heavy metals in the natural aquatic environment.  相似文献   

The theory of relativity and super-luminal speeds     

Cao Shenglin 《Astrophysics and Space Science》1992,190(2):303-315

According to the different properties between the ds ² and the ds ⁴, it is discussed that the space-time will have the catastrophe nature on the Finsler metric ds ⁴ (see Cao, 1990, Paper II). The space-time transformations and the physical quantities will suddenly change at the catastrophe theory of the space-time. It will be supposed that only the dual velocity of the super-luminal-speed could be observed (see Cao, 1988). If so, a particle with the super-luminal-speedv>c, could be regarded as its anti-particle with the dual velocityv ₁=c ²/v<c.The project was supported by National Natural Science Foundation of China.  相似文献   

技术要素按贡献参与分配的探讨     

湛波 《广东海洋大学学报》2003,23(2):88-93

分析了技术要素按贡献参与分配的基本依据和存在问题 ,提出了技术要素按贡献参与分配的建议 :1.在企业分配领域 ,鼓励技术要素以多种形式参与收益分配 ,鼓励体制创新 ,推进技术股份化。 2 .在政府分配领域 ,政府财政科技投入比例与其科技发展对经济贡献增长率挂钩 ,科技财税政策与产业政策、税源经济吻合 ,营造科技奖励的软环境。 3.在社会分配领域 ,充分发挥技术评估部门和行业管理部门的作用 ,对进入技术市场的技术的成熟度和科技含量进行有效的测试和监管 ,保证技术商品的品质 ;技术交易当事人应具诚信态度和法制观念 ;重视中介的作用 ,把技术市场搞活。  相似文献   

Two Different Dust Storms in Northeast China:the Sources and Influences in East Asia     

Ke Hu  Yuying Liu  Zhen Cao 《世界地质(英文版)》2003,6(1)

There are two different dust storms in Northeast China, normal dust and alkali dust, from Kerqin sand land and Songnen saline land. As well as visible damages of the dust storms, there are some invisible influences. The authors provide evidences that the bacteria carried by dusts from remote area should not be ignored, but the damages of the alkali dusts are still not clear.  相似文献   

A preliminary application GIS in glaciological research along the traverse route from Zhongshan Station to Dome A, Antarctica   总被引：1，自引：0，他引：1  

温家洪  孙波  康建成  李院生 《极地研究(英文版)》2003,14(1)

1　IntroductionGeographicalinformationsystem (GIS)isanefficientwayandimportanttechniquetomanage,displayandanalyzeAntarcticspatialdata.GIScanbeusedtomakeandre newmapproductsquickly ,evaluateenvironment,supportlogisticmanagementandfieldoperation,providechancetoextractnewknowledge,andtopromoteinformationex changeamongnationsunderthedemandoftheMadridProtocol(AADC 2 0 0 1 ;MAGIC1 998;1 999) .WorkingGroupofGeodesyandGeographicInformation (WG GGI)ofScientificCommitteeonAntarcticResearch (…  相似文献   

Theory of relativity and super-luminal speeds     

Cao Shenglin 《Astrophysics and Space Science》1992,193(1):123-140

It is possible that the Finsler space-timeF( _{x, y} ) may be endowed with a catastrophic nature. In particular, the horizon of the field of the general relativity is just a catastrophic set. If so, a particle with the super-luminal speeds could be projected near the horizon of these fields, and the particle will move on the space-like curves. It is very interesting that, in the Schwarzschild fields, the theoretical calculation as the space-like curves should be in agreement with the data of the superluminal expansion of extragalactic radio sources observed year after year.The project has been supported by the National Natural Science Foundation of China.  相似文献   

济南张马屯铁矿帷幕注浆堵水工程简介     

孙波 《山东国土资源》2005,(Z1)

济南张马屯铁矿安全生产30年,其根本保证是通过帷幕注浆建立起了一条长效稳定的地下“拦水大坝”。该技术不仅具有极高的安全效益和经济效益,同时具有保护地下水资源的社会效益。该项技术适用范围广、工艺成熟、易于实施,应该作为深井大水矿山地下水治理的主要技术方法予以推广应用。  相似文献   

高煤级煤储层煤层气产能“瓶颈”问题研究   总被引：12，自引：0，他引：12  

傅雪海 秦勇姜波  韦重韬 《地质论评》2004,50(5):507-513

基于山西沁水盆地高煤级煤储层宏观裂隙、显微裂隙的连续观测,孔隙的系统测量,结合应力渗透率、气-水相对渗透率、吸附膨胀等实验成果,分析了高煤级煤储层三级渗流特征,探讨了有效应力和煤基质收缩对高煤级煤储层渗透率的耦合作用,系统揭示了在地面排水降压开发煤层气的过程中,高煤级煤储层初期产气量高,数月后急剧衰减之“瓶颈”现象,找出了造成高煤级煤储层产气缺陷的根本原因。鉴于高煤级煤储层物性的特殊性,指出了高煤级煤储层煤层气开发的技术和措施。  相似文献   

Release of heavy metals during weathering of the Lower Cambrian Black Shales in western Hunan,China   总被引：8，自引：0，他引：8  

Bo?PengEmail author  Zhaoliang?Song  Xiangling?Tu  Meilian?Xiao  Fucheng?Wu  Huanzhe?Lv 《Environmental Geology》2004,45(8):1137-1147

Weathering of heavy metal enriched black shales may be one of the most important sources of environmental contamination in areas where black shales are distributed. Heavy metal release during weathering of the Lower Cambrian Black Shales (LCBS) in western Hunan, China, was investigated using traditional geochemical methods and the ICP-MS analytical technique. Concentrations of 16 heavy metals, 8 trace elements and P were measured for samples from selected weathering profiles at the Taiping vanadium ore mine (TP), the Matian phosphorous ore mine (MT), and Taojiang stone-coal mine (TJ). The results show that the bedrock at these three profiles is enriched with Sc, V, Cr, Co, Ni, Cu, Zn, Pb, Th, U, Mo, Cd, Sb, Tl, and P. Based on mass-balance calculation, the percentages of heavy metals released (in % loss) relative to immobile element Nb were estimated. The results show significant rates of release during weathering of: V, Cr, Co, Ni, Cu, Zn, U, Mo, Cd, Sn, Sb, and Tl for the TP profile; Sc, Cr, Mn, Co, Ni, Cu, Zn, Pb, Th, Cd, and Sn for the MT profile; and Sc, Mn, Co, Ni, Zn, Th, Cd, Sn, and Tl for the TJ profile. Among these heavy metals, Co, Ni, Zn, Cd, and Sn show very similar features of release from each of the three weathering profiles. The heavy metals released during weathering may affect the environment (especially topsoil and surface waters) and are possibly related to an observed high incidence of endemic diseases in the area.  相似文献   

西藏冲江铜矿含矿岩体与非含矿岩体区分探讨   总被引：6，自引：0，他引：6       下载免费PDF全文

刘波  李光明  李胜荣 《沉积与特提斯地质》2004,24(4):55-58

冲江铜矿位于世界三大斑岩成矿域的特提斯-喜马拉雅成矿域,其大地构造位置属冈底斯-念青唐古拉构造带的冈底斯陆缘火山-岩浆弧中部。矿区含矿岩体与非含矿岩体的岩性相同,很难通过肉眼或常规分析方法把它们区分开来。热释光测试结果表明,矿区岩石的热释光曲线有单峰和双峰两种,矿化主要发生在具单峰的似斑状二长花岗岩中。岩石矿化程度越强,热释光总积分强度值越小。另外,高岭土化对岩石天然热释光有叠加作用,具高岭土化的岩石明显具有更高的热释光值,且高岭土化与矿化成负相关。因此,热释光值可作为判断矿化的一个岩石标型。石英粒度统计也表明,含矿岩体的石英粒度曲线呈韵律式变化,而不含矿的岩石粒度曲线呈渐进式变化。故岩石中的石英粒度也可作为矿化的一个矿物标型。  相似文献