摘要：there is a comm on sense view for atomic magnetometers that their spin-projection-noises(SPNs) are inversely proportional to (t_2)^(1/2), where (t_2)^(1/2) is the transverse relaxation time. We analyze the current atomic magnetometer types and give a counter-example of this common sense, which is the all-optical spin precession modulated threeaxis atomic magnetometer proposed by our group in 2015. Unlike the other atomic magnetometers, the SPN of this kind of atomic magnetometers is proportional to (t_2)^(1/2) due to the fact that the scale factor between P_x and B can be unrelated to the transverse relaxation time t_2. We demonstrate this irrelevance experimentally and analyze the SPN theoretically. Using short-pulse ultra-high power laser to fully polarize the atoms, the phenomenon that SPN decreases with t_2 may also be demonstrated experimentally and a new tool for researching SPN in atomic magnetometers may be realized.

摘要：对这群消费者而言,他们所崇尚的数字生活,有着与以往截然不同的价值标准。他们是新兴行动派,追求创新,要求风格与品质,不再清楚划分工作与玩乐。他们心中渴望快乐、自由、简单。他们期望的,是一种可以让生活更有乐趣的通信科技产品。

摘要：Zhengzhou, Henan地点/河南郑州设计/2010-2014年/竣工/2016年Design Stage 2010-2014Completion 2016业主河南机场集团有限公司设计团队主要成员任炳文(项目总负责);刘战、杨海荣、邵明东、梁钧明、郝鹏、燕翼、支宇、龙晓涛、李曙光、李鑫、邓可、骆菊香、刘洪平、张洪涛、李邦侨、王冠(建筑及规划设计);隋庆海、吴一红、王艳军、赵雪峥、陈锦涛、岑楚深、

摘要：随着微机电系统的飞速发展,微孔类零件广泛应用于生物医疗、微电子以及纺织印染等领域中,要求尺寸精度高、断面质量和重复性好,并且能够实现低成本批量制造.微冲孔技术具有传统塑性加工工艺的优点,生产效率高,工艺简单,成形件性能好和精度高,非常适合微型零件的低成本批量制造.针对箔板微孔类零件,设计了一套精密微冲孔模具,采用微冲孔技术研究了冲裁条件对微冲孔工艺的影响规律.结果表明,微冲孔过程与传统冲裁类似,经由弹性变形阶段和塑性剪切阶段,最后断裂分离.微孔断面分布仍然包括圆角、光亮带、断裂带和毛刺.随着相对冲裁间隙的增加,最大剪切强度先降低后逐渐增加;随着冲裁速度的增加,铜箔微冲孔过程最大冲裁力和最大剪切强度逐渐减小,微孔断面光亮带高度增加,断面质量提高.最后,在最佳的冲孔工艺即冲裁间隙为5%、冲裁速度为20mm/s的条件下冲出直径为0.4mm质量良好的微孔.

摘要：近日，国际著名的工作站性能评估公司SPEC在其网站公布了一组数据，列举了IBM、HP、DELL等品牌主流工作站的性能评测结果。在包括了Lightscape、Pro·E、3dmax、Unigraphics等相关软件的SPEC viewpert 7.1测试中，我们很惊讶的发现，入门级绘图卡ELSA FireGL

摘要：核磁共振方法以质子(H)为探针,为研究木材与水分的关系提供了一个新的视角.该文通过研究杨木在32℃恒温、相对湿度为98%恒湿环境下杨木吸着过程中质子的自旋-自旋弛豫时间t2的变化,进而来分析木材吸着过程中水分的分布与迁移特性.探测木材吸着过程中水分的迁移行为,为解释木材与水分的关系提供了一个有力的理论依据,同时从微观层面揭示木材吸着过程中水分的吸附机理,其水分吸附机理同样适用于食品等领域.实验结果证实核磁共振是揭示木材与水分的复杂关系的一个有效的手段.

摘要：结合t2铜套产品加工实例,开发了一套反向冷挤压模具,对实心铜棒进行反向冷挤压,最终达到设计要求。反向冷挤压技术改变了铜套传统的加工制造方式,大幅度提升了产品生产效率和产品质量,原材料节省超过50%。模具中创新性地设计了小锥度(≤5°)圆台式结构的凸模和凹模,巧妙地解决了铜套的脱模问题和压制过程中的排气问题,有效保证了产品质量的稳定性。试验中用反向冷挤压模具压制t2铜套,单件加工综合成本仅为传统方式的1.6%,极具推广价值。

摘要：In this paper, we present a novel and efficient method for the design of a sharp, two dimensional (2D) wideband, circularly symmetric, FIR filter. First of all, a sharp one dimensional (1D) infinite precision FIR filter is designed using the Frequency Response Masking (FRM) technique. this filter is converted into a multiplier-less filter by representing it in the Canonic Signed Digit (CSD) space. the design of the FRM filter in the CSD space calls for the use of a discrete optimization technique. to this end, a new optimization approach is proposed using a modified Harmony Search Algorithm (HSA). HSA is modified in such a way that, in every exploitation and exploration phase, the candidate solutions turns out to be integers. the 1D FRM multiplier-less filter, is in turn transformed to the 2D equivalent using the recently proposed multiplier-less transformations namely, t1 and t2. these transformations are successful in generating circular contours even for wideband filters. Since multipliers are the most power consuming elements in a 2D filter, the multiplier-less realization calls for reduced power consumption as well as computation time. Significant reduction in the computational complexity and computation time are the highlights of our proposed design technique. Besides, the proposed discrete optimization using modified HSA can be used to solve optimization problems in other engineering disciplines, where the search space consists of integers.

摘要：在PⅢ-M时代，Panasonic推出tI，当时它是同级机种中全球最轻的型号，最轻配置仅重999g．将tOSHIBA的Portege2000系列拉下最轻机种宝座。tI的设计也成为t2和W2的蓝本，Panasonic将tI改为迅驰平台成为t2，并且在tI的基础上加入内置光驱成为W2。

摘要：索尼t2是索尼t系列的最新产品,全新的浑圆厚实的机身设计,拥有白、黑、蓝、绿、粉红5种色彩的选择,内置4GB大容量内存,可将存储在电脑中的照片复制出来,像数码相册一样随身携带,方便你与亲朋好友分享美好记忆,是一款内置大容量相册功能的新型概念相机。