F-P光纤传感器的温度与应变传感特性研究

介绍了F P光纤传感器的基本原理及优点,并据此研制出F P光纤传感器。对所研制的F P光纤传感器的温度特性及应变特性进行了理论分析和对比试验研究。结果表明:试验结果和理论分析基本吻合,F P光纤传感器对温度具有天然的稳定性,对应变具有良好的线性度和灵敏度。因此,可处理单一信号,从而避免了多个信号的交叉敏感问题.     

跨平台Memory Stick技术 带领全新数码生活

跨平台 Memory Stick技术带领全新数码生活。 Sony公司向中国国内市场推出最新款 Sony Cyber－ shot数码照相机 DSC－ F55E。 Sony Cyber－ shot数码照相机 DSC－ F55E内置 211万像素 CCD，并采用专业“蔡司” 镜头，可提供具有高解像度的更高质素的图像效果。 DSC－ F55E还配备 180度旋转镜头，具有非常灵活的拍摄角度。 　　Sony Cyber－ shot数码照相机特别采用了 Sony新一代数码资讯 IC储存媒体 —“ Memory Stick记忆棒”作为数码影像的储存及传送媒体，展现了更广泛的用途，实现了人们长期以来希望跨越多种平台方便地…     

光纤F2P 加速度传感器的研究

F2P 干涉仪(简称FPI) 对工程上超低频微弱振动信号的测试,具有较好的效果. 本 文提出了一种干涉仪F2P 加速度计,设置了参考通道,采用单通道信号处理,理论分析和实 验结果表明,它具有较高的测量精度和工作稳静性.     

凤舞九天——《Aero Dancing F》

在DreamCast中十分受欢迎的《AeroDancingF》终于移植至电脑上，而且玩者更可透过Internet轻易地跟其他玩者对战，如果大家热爱空战或是在空中飞行，那么《AeroDancingF》一定可以满足大家。游戏特色　　《AeroDancingF》的画面及战况十分逼真，多个场景也是到真实的空军基地去取景，所以逼真度十足，而游戏中亦有F－1、F－2、F－4、F－8、F－15、F－104、F－14、F－16、F/A－18、T－2、T－3、T－4等等31部战机，所以在DreamCast一推出便有一大班拥护者。游戏模式　　FighterPilotMission（飞行任务）玩者在这个模式中扮演一个…     

产业动态

记者周安利报道 在移动领域表现不甚活跃的HP,近日集成HP的技术优势推出了HP Omnibook 6000系列产品。HP把Omnibook 6000系列产品定位于要求高可靠性能,又追求时尚的用户群。6000系列笔记本有六款产品:F2090W/K、F2087W/K、F2083W/K、F2081W/K、F2079W/K、F2072W/K,全部采用英特尔处理器,包括PⅢ700、PⅢ650、PⅢ600、Celetron四种型号。其中F2090W/K具有PⅢ700处理器、128MPC 100内存、18G硬盘、15英寸TFT显示器、8M显卡、6XDVD-ROM、内置Modem和网卡,多少有点接近工作站级的移动商务平台。所有机器都具有轻薄的特点,而且HP利用自己在服务器方面的     

F-信息伪装与伪装-还原辨识

P集合(packet sets)是由内P集合XF (internal packet set XF)与外P集合XF (outer packet set XF)构成的集合对,或者,相似文献   

定位入门应用华硕单路服务器主板P7F—X上市

近日,华硕再次面向中小企业市场以及个人用户推出一款入门级服务器主板～一华硕P7F—X,该主板是继P7F—E之后华硕P7F主板家族的又一单路服务器主板产品。华硕P7F—X定位企业以及个人用户日常数据处理任务应用,在搭建成本以及功耗方面具有突出优势,是注重成本的入门级用户的最佳选择。     

水稻新种质──沈农89-366特性遗传研究(Ⅰ)──沈农89-366种质F_1代亲和性、优势和矮秆性状分析

沈阳89－366是偏矮秆粳稻,与粳、籼、爪哇3种类型品种杂交,F1代结实率与亲本无显著差异,具有广亲和性,与爪哇型品种杂交F1代优势性状多而强,与偏矮秆品种杂交F1代株高半矮秆,是水稻超高产杂交育种有应用前景的新种质。     

数字图像的两类非线性变换及其周期性

研究了Fibonacci-Q变换及其逆变换的周期性,并证明了Fibonacci变换周期与Arnold变换周期的关系式,利用Fibonacci-Q变换Arnold变换之间的内在关系,定义了一种新的非线性变换－A－F变换,同时对其变换周期及其逆变换周期进行了研究,也给出了这两类变换周期的简洁算法。由于A－F变换和Fibonacci-Q变换与Arnold变换的周期性大相径庭,在实际应用中可达到更加安全保密的效果。     

逆P(ρ(σ),η(τ))-集合与它的随机特性

在逆P-集合(F,F)的基础上,给出了具有迁移随机性的逆P(ρ(σ),η(τ))-集合的概念与结构;讨论了逆P(ρ(σ),η(τ))-集合与逆P-集合的关系;给出逆P(ρ(σ),η(τ))-集合的动态特征与随机特征定理。     

相应于无冲突依赖的规范化对象模式森林

首先概括对象依赖、无冲突对象依赖集合、规范化对象模式森林和复杂对象模式规范化设计算法的基本概念和性质;然后给出并证明相应于无冲突对象依赖集合M的规范化对象模式森林F的性质:P(F)是惟一的、不可分解的规范化对象模式森林的路径集合;M<=>OD(F)<=>P(F);P(F)是无(环的.这对于面向对象信息系统的开发有一定的意义.     

Unicast in hypercubes with large number of faulty nodes

Unicast in computer/communication networks is a one-to-one communication between a source node s and a destination node t. We propose three algorithms which find a nonfaulty routing path between s and t for unicast in the hypercube with a large number of faulty nodes. Given the n-dimensional hypercube H_n and a set F of faulty nodes, node uϵ H_n is called k-safe if u has at least k nonfaulty neighbors. The H_n is called k-safe if every node of H_n is k-safe. It has been known that for 0⩽k⩽n/2, a k-safe H_n is connected if |F|⩽2^k(n-k)-1. Our first algorithm finds a nonfaulty path of length at most d(s,t)+4 in O(n) time for unicast between 1-safe s and t in the H_n with |F|⩽2n-3, where d(s,t) is the distance between s and t. The second algorithm finds a nonfaulty path of length at most d(s,t)+6 in O(n) time for unicast in the 2-safe H_n with |F|⩽4n-9. The third algorithm finds a nonfaulty path of length at most d(s,t)+O(k²) in time O(|F|+n) for unicast in the k-safe H_n with |F|⩽2^k(n-k)-1 (0⩽k⩽n/2). The time complexities of the algorithms are optimal. We show that in the worst case, the length of the nonfaulty path between s and t in a k-safe H_n with |F|⩽2^k(n-k)-1 is at least d(s,t)+2(k+1) for 0⩽k⩽n/2. This implies that the path lengths found by the algorithms for unicast in the 1-safe and 2-safe hypercubes are optimal     

A compact electromagnetic micro-actuator using the meander springs partially exposed to magnetic field

We present the design, fabrication, and testing of a compact electromagnetic micro-actuator using meander springs that are partially exposed to the magnetic field. The previous electromagnetic micro-actuators using cantilever springs require large electromagnetic force for large displacement actuation and therefore require high-current input and a large magnet. The previous electromagnetic actuators using low-stiffness meander springs are limited in large displacement actuation because actuation forces cancelled each other due to changes in the current path under the magnetic field. In this paper, we compare two prototypes: a conventional prototype F with the meander springs exposed fully to the magnetic field and the present prototype P with the meander springs partially exposed to the magnetic field. In the experimental study, the amplitude of prototype P is measured as 30.49 ± 0.36 µm at the 40 mA square input current, while the amplitude of prototype F is measured as 26.02 ± 0.65 µm. The amplitude of prototype P is 17.2 % larger than that of prototype F, verifying the effect of partial exposure of the meander springs to the magnetic field. Therefore, we experimentally demonstrate the large-displacement actuation performance of the present actuator using the partial exposure of the meander springs to the magnetic field.     

微结构谐振梁式压力传感器研究

利用微电子机械加工技术成功地研制出电势激励、压阻拾振的高精度硅谐振梁式压力传感器,传感器的谐振器的品质因素Ｑ值大于１７０００。采用扫描检测方式和闭环自激振荡方式测定压力传感器的压力特性,其压力测试范围为０￣４００ｋＰａ,线性相关系数为０．９９９９５,测试精度小于０。０６％Ｆ．Ｓ。     

Prediction of carbon-13 NMR chemical shift of alkanes with rooted path vector

Systematic studies were further made on graph theory in quantitative structure-spectrum relationships (QSSR) for various areas of spectroscopies. Chemical shifts (CS) in alkanes for carbon-13 nuclear magnetic resonance (13C NMR) were well correlated with a set of novel molecular graph indices, called the rooted path vector of various lengths, as several multivariate regression equations as following:CS=3.022+5.336P1+7.356P2-1.648P3+0.83859P4+0.210P5-0.138P6-0.506P7+2.486P8-1.669P9; n=402, m=9, R=0.944, RCV=0.9413, S.D.=3.333, F=358.343, U=35833.211, Q=4355.422 for all types (primary, secondly, tertiary, quaternary as well as methane) of carbon atoms CS=0.983+6.811P1+7.584P2-2.029P3+0.809P4+0.106P5+0.043P6-0.124P7+1.715P8-1.101P9; n=374, m=9, R=0.975, RCV=0.9737, S.D.=2.303, F=773.372, U=36912.109, Q=1930.363 for primary, secondly, tertiary (including methane) carbon atoms; and CS=27.819+2.351P2+0.549P3-0.440P4+0.170P5-0.050P6; n=27, m=5, R=0.992, RCV=0.9674, S.D.=0.324, F=265.418, U=138.891, Q=2.198 for quaternary carbon atoms, respectively. Quite good estimation and prediction results were obtained from the quantitative molecular modeling and the performance of multiple linear regression (MLR) equations were tested to work well through cross-validation (CV) with the leave-one-out (LOO) procedure.     

DSS中数据管理新技术研究

数据仓库和OLAP技术是有效使用大量、分布、异构数据源的先进技术,自出现以来就成了现代DSS数据管理子系统的核心,为DSS的开发和应用开辟了一条新的途径.     

超方体Qn的路分解及其算法

在超方体[Qn]的路分解的研究中,证明了[Qn]存在[{Pn+1}]-分解的定理;分别给出了[Qn]存在[{P4}]-分解的充分必要条件和存在[{P3,P4}]-分解的充分条件;结合超方体的性质和路分解结论,设计出超方体的路分解算法程序。     

Identification of a potential proton donor to the linking oxygen atom in a three-metal ion assisted catalysis pathway catalyzed by Fructose-1, 6-bisphosphatase

In this paper, the dephosphorylation mechanism of FBP to F6P catalyzed by the Fructose-1, 6-bisphosphatase (St-Fbp) from Sulfolobus tokodaii was studied using quantum mechanical/molecular mechanical (QM/MM) approach. Based on the experimental results, total five possible catalytic mechanisms (path1-path4′) were designed. The most possible dephosphorylation reaction follows a two-step mechanism (path2): a dephosphorylation process (with D12 being an base of W6 and residue K133 being the proton donor of the linking FBP:O4) and a proton exchange process (between K133 and the water W1). Furthermore, the three-step of path4 is also possible: a dephosphorylation process (with D54 being the base of W6 and residue K133 being the proton donor of the linking FBP:O4) and two proton exchange processes (first between residues D54 and D12 then between K133 and the water W1). The relative low energy of this pathway suggests that D54 might also be a base except D12. Our calculations indicate that K133 is the preferred proton donor during the breaking of the phosphate bond O4-P1, with the W1 being an alternative proton donor to access to a more stable product. Findings here give a new insight into the understanding of catalytic mechanism of FBPase.     

Improving Query Response Delivery Quality in Peer-to-Peer Systems

Unstructured peer-to-peer (P2P) system is the prevalent model in today's P2P systems. In such systems, a response is sent along the same path that carried the incoming query message. To guarantee the anonymity of the requestor, no requestor information is included in the response message, and each node in the query's incoming path only knows its direct neighbors who sent the query request to it. This mechanism introduces response loss when any one node or connection in the path fails, which is a common occurrence in the P2P system due to its dynamic feature. In this paper, we address the response loss problem and show that peers' oscillation can cause up to a 35 percent response loss in an unstructured P2P system. We also present three techniques to alleviate this problem: the redundant response delivery (RRD) scheme as a proactive approach, the adaptive response delivery (ARD) scheme as a reactive approach, and the extended adaptive response delivery scheme to render ARD to function in an unstructured P2P system with limited or no flooding-based search mechanism. We have evaluated our techniques in a large-scale network simulation. With limited traffic overhead, all three techniques reduce response loss rate by more than 65 percent and are fully distributed. We have designed our techniques to be simple to develop and implement in existing P2P systems