Beam characterization and spatial coherence measurement of F2 laser using Lumilass glass fluorescence

This paper presents the spectral emission and saturation properties of a Lumilass G9 fluorescence glass excited using a 157 nm laser emitting ∼10 ns duration pulses. This fluorescence glass can be applied in conjunction with a CCD array for beam profiling and divergence measurements. This method can also be used for deriving information on the spatial coherence function of the F₂ laser. This constitutes one of the major contributions of the paper and is also discussed.     

大型激光装置精密同步系统总体技术研究

提出了一种用于大型激光装置的精密同步系统总体架构技术。该技术采用时钟及数据恢复、光级联技术成功地实现了多数量、多种类同步触发信号的有序组合,保证了同步触发信号的精度,获得的ps级精密同步触发信号的时间间隔抖动为:峰峰抖动小于100ps,均方根值小于10ps。     

A new conserved quantity for non-Kerr law optical solitons

This paper talks about a new conservation law in non-Kerr law media. This new integral of motion is used to provide an equation for the phase of the soliton. This law is also used to obtain the adiabatic variation of the soliton phase due to perturbation terms in a non-Kerr law media that includes the power law, parabolic law and the dual-power law.     

Analysis of BPSK homodyne receivers based on modified dither optical phase-locked loop

Optical homodyne receivers based on modified Dither Optical Phase-Locked Loop is analyzed taking into account the laser phase noise, photo detectors shot noise and the dither signal. This modified loop contains all the components of a standard Dither OPLL in conjunction of an additional phase modulator. This modified loop considerably improves the performance of the homodyne reception technique over the earlier technique with the help of commercially available external cavity lasers with line-width of about few hundred kHz. This modified dither OPLL seems a realistic approach for receiving modulated signal for inter-satellite communication systems. This modified technique provides the advantage of low weight, small size and above low cost because the proposed technique significantly reduces the requirement of very narrow line-width lasers. This modified dither loop shows good improvements in the reduction performance over previously reported methods, like, less system power penalty, relaxed line-width requirement.     

Nonreciprocal Transmission and Nonreciprocal Entanglement in a Spinning Microwave Magnomechanical System

This study presents nonreciprocal transmission and nonreciprocal magnon–phonon entanglement in a spinning microwave magnomechanical system. This system consists of microwave photons, magnon modes, and phonons. These are created by the vibrational mode of a yttrium iron garnet sphere. This investigation reveals that nonreciprocity is caused by the light that is circulating in a resonator that is experiencing a Fizeau shift. This leads to a difference in the effective detuning frequency of the photon for forwarding and backward drives. A super-strong transmission isolation rate (>100 dB) and a strong entanglement isolation rate (≈50 dB) are obtained by applying the experimental parameters. This scheme opens a new route for exploiting a variety of nonreciprocal effects, and it provides the theoretical basis for the design and realization of magnetically controllable isolators and diodes.     

微牛物污垢形成的传热传质模型

为研究循环冷却水中微生物污垢的形成,本文综合考虑微生物的传质和吸附过程,建立了微生物污垢形成的传热传质模型。该模型基于微生物生长动力学原理,建立了水质参数与污垢热阻的关联关系,并考虑了微生物比生长速率、致垢物质的沉积与脱除速率。通过微生物污垢动态模拟实验,对相关参数进行分析测量,以验证该传热传质模型准确性。实验结果表明:由该模型计算的污垢热阻预测值能够与实验结果很好吻合,验证了该模型的正确性,其综合预测误差为5.8%。     

热载荷下LEYBOLD G-M制冷机制冷性能测试

简要介绍了高温超导传导冷却的意义和G-M(Gifford-McMahon)制冷机的制冷原理。对高温超导传导冷却用G-M制冷机的空载降温过程,热载荷下的工作过程进行实验分析。总结了制冷机性能测试中的实验过程及方法,解决了实验中的一些问题。     

Remote atomic information concentration without Bell-state measurement

This paper proposes a scheme for information concentration of two remote two-level atoms in cavity QED. This scheme does not involve the Bell-state measurement. During the interaction between atom and cavity, the cavity frequency is large-detuned from the atomic transition frequency, thus the scheme is insensitive to both the cavity decay and the thermal field. This idea can directly be generalized in the case of multi-atom information concentration.     

光控照明灯的制作

本简要介绍了一种适用于暗室的光控照明灯的电路原理和制作方法。     

Large numbers hypothesis. IV. The cosmological constant and quantum physics

In standard physics quantum field theory is based on a flat vacuum space-time. This quantum field theory predicts a nonzero cosmological constant. Hence the gravitational field equations do not admit a flat vacuum space-time. This dilemma is resolved using the units covariant gravitational field equations. This paper shows that the field equations admit a flat vacuum space-time with nonzero cosmological constant if and only if the canonical LNH is valid. This allows an interpretation of the LNH phenomena in terms of a time-dependent vacuum state. If this is correct then the cosmological constant must be positive.     

椭偏测厚仪测量结果的计算机数据处理

本详尽介绍了椭偏术测量单层透明薄膜折射率和厚度的方法，采用一种数字迭代计算方法，由测量得到的起偏角A和检偏角P直接算出所测薄膜的折射率和厚度。经过数值试验及与标准值比对，由此编制的计算程序具有准确，快速，方便的特点。     

实验数据的一元线性回归分析及其显著性检验

本文系统介绍一元线性回归方程的解法以及对方程的检验 ,从而确定得出回归方程的正确性。本算法简单 ,易懂     

一种新型同步摄影控制系统

本文介绍了一种新型同步摄影控制系统,它应用具有良好瞬态响应的速度控制和具有较为理想特性的鉴频鉴相技术,大大地缩短了频率牵引过程,使系统快速地进入相位锁定区域,实现了高的同步摄影精度、宽的同步摄影频率范围、短的同步时间,使同步摄影控制系统性能有较大的提高。 本文介绍了该系统的设计思想、控制系统电路、系统性能。该系统已成功地应用于靶场中。系统结构简单,工作稳定可靠,有一定的实用价值。     

Principle Conditioning

The definition of the conditional probability is very important in the theory of the probability. This definition is based on the fact, that random events can be simultaneously measurable. This paper deals with the problem of conditioning for such random events, which are not simultaneously measurable. This paper defines conditional states as convex combination of special states.     

On the extension of solutions of the real to complex KdV equation and a mechanism for the construction of rogue waves

Rogue waves are more precisely defined as waves whose height is more than twice the significant wave height. This remarkable height was measured (by Draupner in 1995). Thus, the need for constructing a mechanism for the rogue waves is of great utility. This motivated us to suggest a mechanism, in this work, that rogue waves may be constructed via nonlinear interactions of solitons and periodic waves. This suggestion is consolidated here, in an example, by studying the behavior of solutions of the complex (KdV). This is done here by the extending the solutions of its real version.     

Impact of the Granulation Process on Color Texture of Compacts

This paper examines the effect of the granulation process on the color texture of compacted powders and granules. The objective is to obtain information to provide for a better comprehension of granulation mechanisms by using a pigment as a texture marker. This requires the establishment of a methodology both to qualify and quantify the spatial variation of color on the compact surface. This is achieved by color image analysis accompanied by both a statistical and a spatial treatment of the color content in the images.     

扁平管管内负压冷凝流动阻力特性研究

本文采用试验的方法对扁平管内的负压蒸汽冷凝过程进行了研究。研究结果表明,这类扁管的特殊结构使得管内的蒸汽充满度高,冷凝液占据整个流动截面的份额小,流动顺利,阻力小,是很好的有利于冷凝液流动的管型。研究结果给出了这类扁平管的管内冷凝流动摩擦阻力的计算方法,为这类管型在空冷凝汽器的应用提供了设计依据。     

Quantum simulation of disordered systems with cold atoms

This paper reviews the physics of quantum disorder in relation with a series of experiments using laser-cooled atoms exposed to “kicks” of a standing wave, realizing a paradigmatic model of quantum chaos, the kicked rotor. This dynamical system can be mapped onto a tight-binding Hamiltonian with pseudo-disorder, formally equivalent to the Anderson model of quantum disorder, with quantum chaos playing the role of disorder. This provides a very good quantum simulator for the Anderson physics.     

腔靶等离子体辐射温度空间分布测量

本文描述了用膜吸收法测量激光等离子体辐射温度空间分布的原理和方法给出了柱形缝靶轴向辐射温度随空间位置变化的特征,对测量结果进行了分析讨论。     

源端网络检测与抑制DDoS方法设计与实现

提出了一种源端网络DDoS攻击检测的方法。本方法基于BPF包过滤在源端网络的网关上监控数据包,通过计算网络报文的目的IP地址的信息熵进行可疑流量的检测,最终进一步使用连接跟踪的技术对可疑流量进行判别。本方法可以有效的鉴别出SYN Flood的流量,并在源端网络中直接拦截,节省计算资源。