2015年全国功率超声学术会议在杭州成功召开

2015年全国功率超声学术会议在杭州成功召开     

我国食品安全科技获重大进展

科技部在“十五”期间设立的“食品安全关键技术”重大科技专项以食品安全监控技术研究为突破口，现已获重大进展。据悉，通过攻关，我国已研制出农兽药、生物毒素等食品安全相关检测设备18台。特别是我国研发成功的高灵敏度QSIL—FPD检测仪，在有机锡检测方面，其分析灵敏度较国外常规FPD高3倍。研制的亚硝酸盐和氰化物快速检测系统已应用到“神舟五号”载人航天飞船中，用于食品检测。     

多重因素约束下的网格搜索对策问题研究

首次基于搜索成本及搜索资源等限制因素,构造局中人面向多重约束条件的可行策略集合,建立相应的搜索空间;在给定搜索点权值的基础上,考虑搜索成本与搜索成功概率等因素,构造相应的支付函数,建立多重因素约束下的网格搜索对策模型.为简化模型求解,将对策论问题转化为约束最优化问题,求解约束问题获得最优值,转化为模型的对策值,并给出双方最优混合策略.最后,给出军事想定实例,说明上述模型的实用性及方法的有效性.     

后进生转化的第一要务:帮助学生建立信心

结合实践探研了提高高三某差班化学学业成绩的举措。关键是要从内心尊重同学。要想尽一切办法,采取多种措施和手段,帮助学生建立信心,让他们敢于去尝试努力、体会成功;肯学,进而愿意学,会学,好学,学好。教师要转变观念,真诚关爱学生,多从学生的角度出发,理解学生内心的痛苦和困难。     

创新的趋势与要素

新的趋势和影响呼唤企业创新。为抓住新的市场机会并规避可能的风险,企业应深思在哪些方面创新？如何创新？     

日钠离子电池研发初见成效

据《日本经济新闻》2012年4月30日报道,东京理科大学薮内直明讲师、驹场慎一副教授组织的研究小组与电池专业制造商GS.YUASA公司合作,成功开发出新型钠离子蓄电池电极材料。实验表明,钠离子氧化物含有同量的铁、锰,在层结构中,钠离子作为电储存在层间,其存储量     

从“四不买”分析珠心算教学营销障碍

珠心算教学活动已跨越世纪之年．回望此文化的盛世与衰微，在眺望未来发展之际，请让我们好好地珍惜现在。珠心算教学的成功法则，只是要我们简单地重复的去做。而不用深奥难懂令儿童屡试屡败因而失去奋斗希望的课外活动。珠心算的教学课程如斯简单，儿童绝对不会望而生畏，却能培养出非凡的自信心来、加上能开发头脑、提升智力、增强听力、改善专注力、培养敢于接受挑战的精神．是促进小孩子多元学习能力的最佳科目。     

Increasing Success Probability of a Probabilistic Quantum Teleportation

The probabilistic quantum teleportation scheme [Phys. Lett. A 305 （2002） 12] is improved via two seemingly different methods （i.e., the usual aneilla method and the so-called Kraus method）, respectively. The essence of the improvements is to fetch a part from the residues so that the success probability is accordingly increased. The two improved versions and a similar protocol proposed by Li et al. [Phys. Rev. A 61 （2000） 034301] are compared mutually and discussed. It is found that they are equally efficient and can reach the success probability threshold determined by the inherent entanglement of the quantum channel.     

Characteristics and New Measurement Method of NCSFs of Individual Color Mechanisms of Human Vision

We propose a new method for determining neural contrast sensitivity functions （NCSFs） of isolated color mechanisms based on the measurements of wave-front aberrations and isoluminant color contrast sensitivity functions （CSFs）. Compared with the traditional method, this technique avoids the coherent noise and speckle noise, which are brought by the interference of laser beams, and has great flexibility for the measurements of NCSF of different color mechanisms. Our experiments indicate that the mean NCSF and CSF of the red mechanism are higher than those of the green mechanism, respectively, while those of the blue mechanism are the lowest. However the relative heights of the peak of NCSF and CSF between red and green mechanisms vary in subjects. There are some individuals whose peak values of NCSF and/or CSF of green mechanism are higher than that of the red mechanism. The NCSFs and CSFs of isolated color mechanisms all exhibit the similar characteristics and variation tendency. With the statistical average, the NCSFs of the red, green and blue mechanisms are higher than the corresponding CSFs in the whole spatial frequency. Compared with the corresponding CSFs curves, the peaks of the NCSFs of isolated color mechanisms shift toward higher spatial frequencies, especially for that of blue mechanism which has a largest shift of 3.9 c/deg.     

Optimal Schemes of Teleportation One-Particle State by a Three-Particle General W State

Recently, Xiu et al. [Commun. Theor. Phys. 49 （2008） 905] proposed two schemes of teleporting an N particle arbitrary and unknown state when N groups of three particle general W states are utilized a.s quantum channels. They gave the maximal probability of successful teleportation. Here we find that their operation is not the optimal and the successful probability of the teleportation is not maximum. Moreover, we give the optimal schemes operation and obtain maximal successful probability for teleportation.