纵向非均质性对海上稠油油田水驱油开发效果的影响研究

为兼顾生产成本与开发效果,海上稠油油田开发大多采用多层合采,层内和层间的差异对水驱开发效果影响显著,针对纵向非均质严重的问题,基于不同渗透率级差、不同平均渗透率,建立了反韵律下9种非均质物理模型,研究层内和层间非均质性对海上稠油油田水驱开发效果的影响.研究结果表明:对于层内非均质模型,渗透率级差对开发效果影响更大,平均渗透率相近时,级差越大,层内非均质性越强,注入水沿高渗透层突进,油层下部驱替效果越差,采出程度越低;层内均质层间非均质时,级差越大采出程度越低,高渗层段注入水形成优势通道抑制低渗透层吸水,高渗透层最高采收率达77.4%,低渗层采收率可低至0.7%,使油层上下部驱替效果相差较大;层内和层间都非均质时,分层开采的开发效果好于多层合采,各层采收率变化幅度与分层开采时差异较大;利用综合影响因子表征层内和层间非均质性的综合影响,其值为0.08时对应采出程度为41.48%,综合影响因子越高,纵向非均质性越强,采出程度越低.     

HPLC-DRC-ICP-MS测定富硒蔬菜中的硒形态

建立了高效液相色谱-动态反应池-电感耦合等离子体质谱(HPLC-DRC-ICP-MS)联用测定硒代胱氨酸(SeCys2)、甲基硒代半光氨酸(MeSeCys)、亚硒酸盐(SeIV)、硒代蛋氨酸(SeMet)和硒酸盐(SeVI)的方法。样品通过胃蛋白酶提取,采用Hamilton PRP X-100色谱柱(250 mm×4.6 mm,10μm),使用5 mmol/L的柠檬酸溶液(pH 4.7)作为流动相,在10 min内可以完全分离5种硒形态。在80Se质量数下,采用甲烷作为DRC反应气,可有效消除40Ar40Ar+对80Se的干扰,提高检测灵敏度。电感耦合等离子体质谱(ICP-MS)检测,各硒形态的线性相关系数均大于0.9990,Se(IV)、Se(VI)、SeMet、SeCys2、MeSeCys的定量限分别为5,10,10,5,5μg/kg,5种硒形态的加标回收率在80.1%～99.2%之间,可满足蔬菜中硒形态定量分析。     

单分散PPE齐聚物的合成及其荧光性质

合成了PPE的齐聚物{1,4-二[3,5-二（3-甲基-3-羟基-1-丁炔基）苯炔基]苯）（4）,通过^1H—NMR对其结构进行表征,并对其荧光性质做了研究。研究结果表明引入四个2-甲基-2-羟基-丁炔基作为取代基团后,溶解性提高。取代基的引入导致齐聚物4旋转阻力增大,溶液荧光有明显的精细结构。而4具有较好的荧光单色性,因而是一种潜在的新型荧光发射材料。     

Commissioning of electron cooling in CSRm

A new generation electron cooler has started operation in the heavy ion synchrotron CSRm which is used to increase the intensity of heavy ions. Transverse cooling of the ion beam after horizontal multi-turn injection allows beam accumulation at the injection energy. After optimization of the accumulation process an intensity increase in a synchrotron pulse by more than one order of magnitude has been achieved. In given accumulation time interval of 10 seconds, 108 particles have been accumulated and accelerated to the final energy. The momentum spread after accumulation and acceleration in the 10-4 range has been demonstrated in six species of ion beams. Primary measurements of accumulation process varying with electron energy, electron beam current, electron beam profile, expansion factor and injection interval have been performed. The lifetimes of ion beams in the presence of electron beams were roughly measured with the help of DCCT signal.     

HIRFL-CSR commissioning in 2006 and 2007

HIRFL-CSR, a new heavy ion cooler-storage-ring system at IMP, had been in commissioning since the beginning of 2006. In the two years of 2006 and 2007 the CSR commissioning was finished, including the stripping injection (STI), electron-cooling with hollow electron beam, C-beam stacking with the combination of STI and e-cooling, the wide energy-range synchrotron ramping from 7 MeV/u to 1000 MeV/u by changing the RF harmonic-number at mid-energy, the multiple multi-turn injection (MMI), the beam accumulation with MMI and e-cooling for heavy-ion beams of Ar, Kr and Xe, the fast extraction from CSRm and single-turn injection to CSRe, beam stacking in CSRe and the RIBs mass-spectrometer test with the isochronous mode in CSRe by using the time-of-flight method.     

用万用表检查兆欧表准确度

兆欧表是电工、电子实验室的常用仪表．用它测绝缘电阻之前一般要进行以下准确度检查．     

PA-130/CA合金膜材料的研制及其性能

采用溶液共混和液-固相转变法(L-S)制备了用于高效液相色谱(HPLC)柱填料的共聚尼龙/醋酸纤维素共混物(PA-130/CA)。以小分子量化合物为探针分子,用HPLC数据表征了PA-130/CA合金膜材料的界面性能,并研究了其合金膜材料的相容性和热稳定性。结果表明:PA-130与CA有很好的相容性;该合金膜的热稳定性比纯CA膜的有所提高;质量比为30/70的PA-130/CA合金膜对不离解极性有机物的分离效率更高。     

含润滑油微胶囊复合镀铜机理和镀层性能

采用水相分离法制备了以润滑油为囊心、聚乙烯醇为囊壁的微胶囊，并考察了含这种微胶囊复合镀铜层的性能.通过对这种复合镀层微观形貌的观察及耐腐蚀性、耐磨性、动摩擦系数的测定，结果表明由于复合镀铜层中含有润滑油微胶囊，其耐腐蚀性和耐磨性能都得到很大提高，并分析了这种微胶囊复合电沉积的机理和镀层的润滑、修复作用.     

First-principles study of strain effect on the formation and electronic structures of oxygen vacancy in SrFeO_2

Motivated by recent experimental observations of metallic conduction in the quasi-two-dimensional SrFeO_2, we study the epitaxial strain effect on the formation and electronic structures of oxygen vacancy(Vo) by first-principles calculations.The bulk SrFeO_2 is found to have the G-type antiferromagnetic ordering(G-AFM) at zero strain, which agrees with the experiment. Under compressive strain the bulk SrFeO_2 keeps the G-AFM and has the trend of Mott insulator-metal transition.Different from most of the previous similar work about the strain effect on Vo, both the tensile strain and the compressive strain enhance the Vo formation. It is found that the competitions between the band energies and the electrostatic interactions are the dominant mechanisms in determining the Vo formation. We confirm that the Vo in SrFeO_2 would induce the n-type conductivity where the donor levels are occupied by the delocalized d_(x~2-y~2) electrons. It is suggested that the vanishing of n-type conductivity observed by the Hall measurement on the strained films are caused by the shift of donor levels into the conduction band. These results would provide insightful information for the realization of metallic conduction in SrFeO_2.     

脉冲重复频率对脉冲激光沉积薄膜的生长过程的影响

脉冲重复频率在脉冲激光沉积技术中起重要的作用,影响最终的薄膜材料的性能.利用动力学蒙特卡罗方法,我们研究了脉冲激光沉积技术中,在不同脉冲重复频率条件下的薄膜生长的初期阶段.模拟结果显示,在低脉冲频率时,前后脉冲之间的间隔时间较长,生长岛有足够的时间熟化.因此,生长岛的密度会比较小且岛的形貌比较规则.而当脉冲重复频率增大时,岛的密度则随之增加,岛呈现出松散的或者枝杈状的形貌.另外,脉冲占空比也就是沉积时间在一定程度上也会对岛的凝聚过程有影响.最后我们将模拟结果与实验结果进行了对比和讨论.