鄂尔多斯盆地奥陶系白云岩碳氧同位素分析

对鄂尔多斯盆地奥陶系白云岩成因类型与碳氧同位素的关系进行了研究。准同生白云岩碳氧同位素值重,δ13C介于0.639‰~-2.2‰之间,δ18O值介于-0.2‰~-8.668‰,产生于咸化水体;成岩白云岩的δ13C介于0.9‰~-3.2‰,δ18O介于-1.7‰~-7.607‰,产生于高镁咸化水体;深埋白云岩碳氧同位素值轻,δ13C介于0.580‰~-3.7‰,δ18O介于-6.88‰~-9.97‰,形成于温度较高、盐度较低、含镁亦较低的环境。白云岩中的碳酸盐脉δ13C集中在-1.00‰~-5.66‰,而灰岩中碳酸盐脉δ13C集中在-1.30‰~-8.65‰;碳酸盐脉氧同位素值较轻且变化较小,δ18O介于-10.66‰~-18.91‰,Z峰值集中在100和110,表明碳酸盐脉形成受到淡水淋滤。      

兰光转换膜的研制及其水稻育秧效果试验

本文介绍了以LDPE与LLDPE为基料的农用兰光转换水稻育秧膜的研制与性能，以及该膜用于水稻育秧的应用效果试验。最终增产效果为5．5％。     

Thermal performance evaluation of heat exchangers fitted with twisted-ring turbulators

Heat transfer, friction factor and thermal performance characteristics in a tube equipped with twisted-rings (TRs) are experimentally investigated. The experiments were conducted using TRs with three different width ratios (W/D = 0.05, 0.1 and 0.15) and three pitch ratios of (p/D = 1, 1.5 and 2) for Reynolds numbers ranging from 6000 to 20,000 using air as a test fluid. The typical circular rings (CRs) were also tested for an assessment. The experimental results reveal that most TRs yield lower Nusselt numbers and friction factor than CRs, except at the largest width ratio (W/D = 0.15) and the smallest pitch ratio (p/D = 1.0). In addition, Nusselt number and friction factor increase as width ratio increases and pitch ratio decreases. However, a maximum thermal performance factor is associated by TRs with the smallest width ratio and pitch ratio. The empirical correlations of the heat transfer (Nu) and friction factor (f) are also included in this paper.     

小型富氧器的研制

用改性甲基硅橡胶膜制成了富氧组件。当膜两侧的压力比为0.26或集气管的绝对压力为20cmHg时,其富氧性能:流量0.80—1.40升/分,富氧空气的氧气含量27.7—33.5%。由组件制成了7组件富氧器,这个富氧器在实验室进行了操作,其操作条件,膜两侧压力比(P_L/P_H)对富氧空气流量及富氧空气中氧含量或分离系数有巨大的影响。     

改性高抗冲聚苯乙烯的阻燃化研究

本文介绍了十溴联苯醚(DBDPO)——三氧化二锑(Sb_2O_3)阻燃体系,对高抗冲聚苯乙烯(HIPS)的阻燃效果。讨论了增韧剂,分散剂对阻燃效果及材料力学性能的影响。结果表明,当阻燃体系加到适量时,可达到UL—94V—0级,但使冲击强度、断裂伸长率下降,断裂强度上升。增韧剂和分散剂的加入,使冲击强度和断裂强度增加,断裂仲长率略有下降。     

Forced convective heat transfer by swirling impinging jets issuing from nozzles equipped with twisted tapes

Forced convective heat transfer on the impinged plate associated with swirling impinging jets (SIJ) issuing from nozzles inserted by twisted tapes has been investigated. Swirling impingement jets with several swirl rates were generated by twisted tapes at different twist ratios (y/W = 3, 4, 5, and 6). The experiments were performed by locating nozzle at 4 different jet-to-plate spacings of L/D = 2, 4, 6 and 8. A jet Reynolds number varied between 4000 and 16000. Attributing to a high momentum transfer rate, an efficient heat transfer was obtained by using the jet with a small jet-to-plate spacing and the twist tape with a large twist ratio at high Reynolds number. At small jet-to-plate spacings (L/D = 2 and 4), swirling impinging jets gave higher heat transfer rate than conventional impinging jets while at large jet-to-plate spacings (L/D = 6 and 8), the opposed result was obtained. Over the range examined, only SIJ induced by the twisted tape at a twist ratio of 6 consistently provided higher average Nusselt numbers than CIJ.     

Photocatalytic performance of CdS nanomaterials for photodegradation of organic azo dyes under artificial visible light and natural solar light irradiation

The CdS semiconductors have been prepared at low temperature via catalyst-free chemical precipitation method without using any surfactant or capping agent. Either water or ethylene glycol, as a solvent, provides spherical CdS nanostructures with a comparable size of 117–121 nm. The molar ratio of Cd/S plays an important role in determining phase structure, morphology and photocatalytic performance of the prepared CdS nanostructures. Increasing molar ratio of S^2? results in not only mixed cubic-hexagonal phases but also low photocatalytic performance. CdS nanoparticles with good dispersibility prepared at Cd/S molar ratio of 1:1 shows high photocatytic efficiency of 95% toward photodegradation of reactive red azo dye (RR141) under visible light irradiation up to 240 min. The degradation efficiency of CdS nanoparticles also reaches 48% under natural solar light irradiation for 80 min. This work demonstrates the promising potential of CdS nanomaterials as photocatalysts for environmental remediation.     

MapReduce平台上面向大规模Web服务组合问题的并行引导变异进化算法

大规模服务组合是一种通过将不同领域的大量服务按照一定的流程组合起来以满足用户需求的策略。然而,在当今的服务数量巨大并且种类颇多,外加用户需求日益复杂的情况下,快速生成一个满足用户要求的最佳QoS的复合服务是一项值得研究的问题。对此提出了以MapReduce模型为基础的引导变异进化算法（MR-GMEA）,该算法能够更好地适用于当前大规模服务组合的主观与客观需求并且可以缩短执行时间,此外其中引入的skyline算子在开始阶段剔除了大量冗余服务从而提高了效率。最后通过仿真验证,证明了该方法的可行性与优越性。     

硝基腐植酸螯合铁、钙在青菜上的应用效果

为验证自制的硝基腐植酸螯合铁和螯合钙作为肥料增效剂在青菜上的实际应用效果,以品名为"苏州青"的青菜为试验对象,进行两种增效剂的肥效试验。结果表明:硝基腐植酸螯合铁和螯合钙配合一定水溶肥使用时,青菜质量分别增加10.32%和40.17%,效果显著。     

Analyse et conception de filtre passe-bande en guide nervuré par l’approche variationnelle

A multimodal variational approach is presented for the characterization of various uni-axial discontinuities in homogeneous waveguide. A study is carried out on the ridged waveguide discontinuities, and the results have been used for the optimized design of a bandpass filter. The introduction of the notion of coupled and uncoupled modes allows reduction of the order of the matrices handled in the numerical calculation and facilitates the use of the optimization process. The theoretical results are in good agreement with measured data.