高分辨力地震是提高中国南方碳酸盐岩地震勘探效能的基础——一个由失败到成功的史例

南方碳酸盐岩复杂地区的地震工作经历了长期艰难曲折的道路,其中异常判别的经验教训极为深刻。本文从地震异常分析入手,揭示其实质,寻求问题的关键,探讨解决的办法,介绍高分辨率地震方法技术,展示高分辨率地震新成果,以得出有意义的结论和建议。     

碱土金属Mg和Ca中毒催化剂的再生研究

为研究碱土金属Mg和Ca中毒催化剂的再生,采用共沉淀法制备了MnO_x/Ce-ZrO_x催化剂,并用浸渍法制备了Mg和Ca负载量为0.2的中毒催化剂,最后对其进行再生实验的研究.结果表明:酸洗后,中毒催化剂的脱硝活性有了很大程度的恢复,且在180℃和200℃之后超过了新鲜催化剂的效率.BET,NH_3-TPD,XPS结果显示:酸洗之后,中毒催化剂的比表面积、表面酸度和表面吸附氧浓度基本恢复到新鲜催化剂的水平,这是催化剂活性恢复的主要原因.     

纳豆芽孢杆菌菌剂的制备工艺

采用单因素及正交试验对纳豆芽孢杆菌发酵培养基、pH、温度、发酵时间等条件进行了考察,利用喷雾干燥法制备菌剂,考察了β-环糊精、蔗糖、可溶性淀粉及脱脂奶粉作为保护剂对菌剂制备的影响,并研究了储藏时间及条件对菌剂发酵活力的影响.研究结果表明:纳豆芽孢杆菌发酵培养基为黄豆浸汁培养基:黄豆以5倍水体积浸泡8~14h,121℃~126℃,0.1~0.15MPa处理1h,滤除黄豆,取豆水,加入5%的葡萄糖和0.02%的K2HPO4,调节pH至7.0;最优发酵工艺:初始pH7.0,37℃发酵10h;喷雾干燥最佳保护剂为5%脱脂奶粉;菌剂4℃冷藏180d以内不影响发酵活力.上述工艺下所制得的纳豆芽孢杆菌菌剂活菌数为6.5×108 CFU/g,发酵生产纳豆激酶性能良好.发酵生产纳豆激酶酶活为2 000~2 200IU/g.本研究为纳豆芽孢杆菌菌剂制备提供了一条较为合理的工艺路线.     

Hydrophobically modified melamine-formaldehyde sponge used for conformance control and water shutoff during oil production

Polymer or polymer gels have been widely used to control excessive water during oil production by homogenizing injection profile and reducing water cut in the produced fluids. However, the gels used are generally unable to selectively minimize water production, and face the challenge of syneresis of gels under high temperature and high salinity environment. In this work, melamine-formaldehyde sponge was modified with AlCl₃ solution, rendering a transition from hydrophilic to hydrophobic state with a water contact angle of 130° on the surface of the modified product. Filtration results show that mineral oil and water can be selectively separated with the hydrophobically modified sponge powders. Simulated water shutoff experiments demonstrated the blockage efficiency against water was 30% higher than that against oil, and the oil production was increased 7.4% after blocking. The parallel profile control tests confirmed that the fraction flow of high permeable channel decreased about 75%, accompanied with 60% rise of oil recovery factor. These results indicated that such hydrophobic materials can significantly reduce excessive water production, and this work provided a new idea to offer a low-cost hydrophobic material for conformance control and water shutoff during oil production.     

脉冲MIG焊接电弧的闭环控制

作者研究成功了一种用于脉冲MIG焊接电弧的闭环控制系统,称为QH-ARC-102控制法。它具有优异的静态及动态品质。无论脉冲或者维弧阶段,电弧的工作点均位于三极管焊接电源阶梯形外特性的恒流段上。因此,电弧稳定,始终保持喷射过渡,飞溅极少,电流的调节范围也较宽广.在每个脉冲期间,均对弧长讯号进行采样以实现对弧长的闭环控制。因此电弧具有很强的抗弧长干扰能力,而且其脉冲工艺参数能够自动优化,可以适应送丝速度大范围的突变。本控制系统对脉动送丝或程序送丝MIG 焊接新工艺比较适用。如用于实现全位置焊接、焊缝成型控制、线能量控制以及熔深的闭环自动控制等,特别是对机器人焊接更为适用。文章论述了本系统的工作原理,介绍了实用的电路图,并且给出了一些焊接结果。     

Ti和V对Fe中氢与位错交互作用的影响

研究了Fe-0.5wt-%Ti和Fe-0.5wt-%V合金中由氢与位错交互作用所形成的氢致冷加工内耗峰(H-CWP)。实验结果表明:合金元素对H-CWP、对氢与位错之间的交互作用有显著的影响,与氢作用愈强的元素,对H-CWP的影响愈大,内耗实验结果与力学性能之间存在着一定的联系.     

加入WTO给当代大学生带来的若干思考

入世对大学人才培养目标、社会人才需求、大学生知识结构、学习理念、就业市场等提出了新的要求，当代大学生必须提高自身的综合素质，培养创新能力，开阔国际视野，重视非智力因素的培养等，以此来适应WTO对人才的需求。     

Meaningful (2, infinity) secret image sharing scheme based on flipping operations

In this paper, a new method to construct a secret image sharing (SIS) scheme is proposed, where a secret image is shared into several shares by a perfect secure way without any knowledge of cryptography. A basic algorithm implemented by flipping operations with probability for constructing a meaningful (2, 2) SIS scheme is first proposed. Neither codebook tailor-made requirement nor pixel expansion is required in the proposed scheme. Additionally, the meaningful shares by the proposed scheme can be directly generated without any extra data hiding process. During the decrypting procedure, the secret image is visually revealed by performing XOR operations on two meaningful shares. In the following stage, a meaningful (2, infinity) SIS scheme is extended underlying the basic algorithm, where the number of shares can be extended anytime. Further, no matter how large the number of the extended shares is, the visual qualities of both the meaningful share and revealed secret image remain unchanged. Finally, sufficient number of formal proofs are provided to validate the correctness of the proposed schemes, whose superiority is also demonstrated by the experimental results.     

运营商发展行业云计算研究

介绍了目前我国云计算发展现状,结合运营商的能力,提出云计算下一步发展建议,并以物流行业作为案例分析具体的解决方案,最后对下一阶段运营商云计算发展进行展望.