高灵敏度多通道激光能量卡计

通过采用硬件高阶有源低通滤波器与软件平滑滤波,有效抑制了噪声干扰,从而允许大幅度增加信号放大倍数,提高了激光能量卡计系统灵敏度,满足了ICF物理实验微弱光信号能量探测的需求。

以“能量卡”为载体初探多元化评价的思考与实践

对幼儿教育工作者来说，评价既是一项重要的工作，也是一个困难的话题。因为幼儿的发展是一个快速变化和相当复杂的过程，幼儿的发展是整体的，不是局部的，幼儿的进步和成长是内在的、渐进的和难以数量化测定的。纵观目前幼儿因的评价存在重教师评价，轻幼儿评价，重评价幼儿的学习结果，轻学习过程的评价等弊病。所以，我们需要寻找到一种适宜和有效的方法来评价幼儿。本文向大家呈现出一种可能的选择，即采用“能量卡评价”：幼儿自评、幼幼互评、教师评价、师幼互评、家长评价等多元化评价模式关注幼儿游戏的事实现象，注重表达和交流的真实性评价。通过一个综合的模式，实现一个较完整、较客观的评价．从而增强游戏教育的针对性．推动自主评价的多元效能。

燃料电池重卡能量管理策略优化路径分析

随着新能源汽车产业的发展,燃料电池重卡越来越受到行业与社会的广泛关注,然而其能量利用率相对较低,经济性较差,能力管理策略相对落后。为此,通过优化燃料电池重卡的能量管理策略来提高其能量利用效率和整车经济性。采用双向全桥DC/DC变换器作为系统控制的一部分,并使用传统移相控制正向工作模式进行能量传输。对燃料电池重卡的能量管理策略进行了优化分析,设计分层能量管理策略,通过协调控制和能量管理来提高系统的整体性能。最后,利用Cruise软件搭建整车模型并设置城市、郊区和高速等常见工况进行仿真,结果表明所提出的分层能量管理策略可以显著提高燃料电池重卡的能耗效率,并降低使用成本,为燃料电池重卡的推广应用提供了可行的技术支持。

一种基于成像板的能量卡阈式快中子图像测量方法

为减小散射中子等较低能量的中子对快中子图像的贡献,提出了在成像板前依次紧贴金属卡阈片和富氢元素薄片的能量卡阈式快中子成像方法.该方法通过改变卡阈片材料、厚度等参数,可有效降低成像结构对某一能段中子的相对灵敏度.以14 MeV中子照相为例设计的能量卡阈式成像结构为TR成像板依次覆盖约150μm Pb膜和500μm聚乙烯膜,计算表明该结构对8 MeV以下快中子灵敏度小于其对14 MeV中子灵敏度的30%.利用K400加速器DT中子源开展了验证实验,结果表明能量卡阈式快中子成像结构能够有效消除样品散射中子引起的边界增强效应.

粗粮低卡能量食品市场前景研究

为顺应大众创业、万众创新的时代新趋势,积极响应国家创新驱动发展战略,研发出一款粗粮低卡能量产品。以粗粮中的黑豆薏米为主要原材料,充分利用其高蛋白、低能量的特性,配合丰富的微量元素,较高的不饱和脂肪酸含量,满足人对产品的健康消费需求。近年来,随着现代人闲暇时间的增多和消费方式的改变,越来越多的人注重自己的健康,健身房运动早已成为我们生活的一部分。但健身前后的进餐方式,也变成了大家所热衷的问题。既要让自己充满能量,又不能摄入高热量。针对该现象,我们团队经过加工制得健康,方便,易于携带的粗粮低卡能量无疑成为健身达人的较好选择;针对肥胖者来说,黑豆薏米中的成分也为此进行科学减肥带去福音;对于关注健康的消费者来说,受当前快节奏生活方式的影响,粗粮低卡能量产品也将成为进餐的替代品。

用于脉冲激光能量表的自动定标装置

本文介绍了一种采用单板机来进行脉冲激光能量卡计定标的实验装置,并给出了装置的结构和流程图,及实验数据。

Energy-Efficient Distributed Lifetime Optimizing Scheme for Wireless Sensor Networks

In this paper, a sensing model for the coverage analysis of wireless sensor networks is provided. Using this model and Monte Carlo method, the ratio of private range to sensing range required to obtain the desired coverage can be derived considering the scale of deployment area and the number of sensor nodes. Base on the coverage analysis, an energy-efficient distributed node scheduling scheme is proposed to prolong the network lifetime while maintaining the desired sensing coverage, which does not need the geographic or neighbor information of nodes. The proposed scheme can also handle uneven distribution, and it is robust against node failures. Theoretical and simulation results demonstrate its efficiency and usefulness.

Effect of captopril on myocardial energy metabolism in chronic pressure overload rats

Objective To investigate the effects of captopril on cardiac function and levels of energy-rich phosphates in pressure overload induced left ventricular hypertrophy rats. Methods One hundred and twenty SD rats were randomly divided into three groups： sham operation group （SH group, n=40）,coarctation of abdominal aorta group （CAA group, n=40） and captopril treatment lmg~ 100g1 ~ d-1） group （CAP group, n=40）. Left ventricular end-diastolic pressure （LVEDP）, left venh-icular mass index （LVMI）, levels of energy-rich phosphates and morphological changes of the myocardial mitochondria were compared at the 62 and 82 week after operation. Results At 62 week, in CAA group, LVMI and LVEDP were increased and _ dp/dtmax was decreased, while ATP and ADP were decreased and AMP was increased （P〈0.01）. These changes were much obvious at 8th week （P〈0.01）. Compared with those of CAA group, the parameters of heart function and energy-rich phosphates （ATP, ADP, AMP, TAN） in CAP group were improved significantly（P〈0.01） at the 6th and 8th week. In CAP group, the parameters of heart function and energy-rich phosphates （ADP, AMP, TAN） were much better at 8~ week than those at 6th week. The morphological change of mitochondria was less in CAP group than that in CAA group. Conclusion Captopril significantly improves myocardial energy metabolism in pressure overload rats and protects the function of myocardial mitochondria

Design Procedure for Semi Interlocking Masonry

SIM （semi interlocking masonry） is a kind of innovative building system for mortar-less walls. It utilizes a special method of interlocking SIM bricks that allows relative sliding of brick courses in-plane of a wall and prevents out-of-plane relative movement of bricks. It has increased capacity to dissipate earthquake energy through friction between bricks compared with traditional masonry. It can be used in earthquake resistant frame structures as infill panels, which also act as EDD （energy dissipation devices）. However, as a mortar-less system, it is not covered by masonry design standards. The purpose of this paper is to introduce S1M and also to develop an analytical design procedure for this innovative masonry system.

Natural ventilation performance of single room building with fluctuating wind speed and thermal mass

Natural ventilation is driven by either buoyancy forces or wind pressure forces or their combinations that inherit stochastic variation into ventilation rates. Since the ventilation rate is a nonlinear function of multiple variable factors including wind speed, wind direction, internal heat source and building structural thermal mass, the conventional methods for quantifying ventilation rate simply using dominant wind direction and average wind speed may not accurately describe the characteristic performance of natural ventilation. From a new point of view, the natural ventilation performance of a single room building under fluctuating wind speed condition using the Monte-Carlo simulation approach was investigated by incorporating building facade thermal mass effect. Given a same hourly turbulence intensity distribution, the wind speeds with 1 rain frequency fluctuations were generated using a stochastic model, the modified GARCH model. Comparisons of natural ventilation profiles, effective ventilation rates, and air conditioning electricity use for a three-month period show statistically significant differences （for 80% confidence interval） between the new calculations and the traditional methods based on hourly average wind speed.

Stability,detonation properties and pyrolysis mechanisms of polynitrotriprismanes C_6H_(6-n)(NO_2)_n (n=1-6)

To further test whether polynitriprismanes are capable of being potential high energy density materials （HEDMs）, extensive theoretical calculations were carried out to investigate on a series of polynitrotriprismanes （PNNPs）： C6H6-.（NO2）. （n=1-6） Heats of formation （HOFs）, strain energies （SE）, and disproportionation energy （DE） were obtained using B3LYP/6-311＋G（2df, 2p）//B3LYP/6-31G＊ method by designing different isodesmic reactions, respectively. Detonation properties of PNNPs were obtained by the well-known KAMLET-JACOBS equations, using the predicted densities （p） obtained by Monte Carlo method and HOFs. It is found that they increase as the number of nitro groups n varies from 1 to 6, and PNNPs with n〉4 have excellent detonation properties The relative stability and the pyrolysis mechanism of PNNPs were evaluated by the calculated bond dissociation energy （BDE）. The comparison of BDE suggests that rupturing the C--C bond is the trigger for thermolysis of PNNPs. The computed BDE for cleavage of C--C bond （88.5 kJ/mol） further demonstrates that only the hexa-nitrotriprismane can be considered to be the target of HEDMs.

Quantitative analysis of the performance of vector tracking algorithms

Vector tracking changes the classical structure of receivers. Combining signal tracking and navigation solution,vector tracking can realize powerful processing capabilities by the fusion technique of receiving channel and feedback correction. In this paper,we try to break through the complicated details of numerical analysis,consider the overall influencing factors of the residual in observed data,and use the intrinsic link between a conventional receiver and a vector receiver. A simple method for performance analysis of the vector tracking algorithm is proposed. Kalman filter has the same steady performance with the classic digital lock loop through the analysis of the relation between gain and band width. The theoretical analysis by the least squares model shows that the reduction of range error is the basis for the superior performance realized by vector tracking. Thus,the bounds of its performance enhancement under weak signal and highly dynamic conditions can be deduced. Simulation results verify the effectiveness of the analysis presented here.

Detection of Photons and Electrons Using a Semiconductor Alpha Detector

The response of a silicon alpha detector to beta particles, electrons and photons was investigated using measurements and Monte Carlo simulations. This information is of relevance for in situ alpha spectrometry from different surfaces at ambient air pressure. According to the simulations, photon detection efficiencies were more than two orders of magnitude smaller than those of electrons. Photons generate signals mainly by Compton electrons. Counts originating from beta particles, electrons and photons were usually below 1 MeV in energy and no clear peaks could be identified from the measured spectra. Unequivocal identification of radionuclides emitting beta particles, electrons and photons is not possible when a mixture of different radionuclides is present in the source. However, radionuclide classification according to their emission energies appears to be possible. Surface contamination measurements will benefit from this capability.

Evaluating the accuracy performance of Lucas-Kanade algorithm in the circumstance of PIV application

Lucas-Kanade(LK) algorithm, usually used in optical flow filed, has recently received increasing attention from PIV community due to its advanced calculation efficiency by GPU acceleration. Although applications of this algorithm are continuously emerging,a systematic performance evaluation is still lacking. This forms the primary aim of the present work. Three warping schemes in the family of LK algorithm: forward/inverse/symmetric warping, are evaluated in a prototype flow of a hierarchy of multiple two-dimensional vortices. Second-order Newton descent is also considered here. The accuracy & efficiency of all these LK variants are investigated under a large domain of various influential parameters. It is found that the constant displacement constraint, which is a necessary building block for GPU acceleration, is the most critical issue in affecting LK algorithm's accuracy, which can be somehow ameliorated by using second-order Newton descent. Moreover, symmetric warping outbids the other two warping schemes in accuracy level, robustness to noise, convergence speed and tolerance to displacement gradient, and might be the first choice when applying LK algorithm to PIV measurement.

Sensitivity study of searching for τ^-→γμ^- at HIEPA

The charged lepton flavor violation process is a clean and sensitive probe of new physics beyond the Standard Model. A sensitivity study is performed to the process τ^-→γμ^- based on a 3 fb^(-1) inclusive Monte Carlo sample of e^+e^- collisions at a center-of-mass energy of4.26 or 4.6 Ge V, in the framework of the BESIII software system. The 90 % confidence level upper limits on B(τ^-→γμ^-) are estimated assuming no signal is produced. We also obtain the sensitivity on B(τ^-→γμ^-) as a function of the integrated luminosity, to serve as a reference for the HIEPA being proposed in China. It is found that 6.34 ab^(-1) are needed to reach the current best upper limit of 4:4 10^(-8) and about 2510 ab^(-1) are needed to reach a sensitivity of 10^(-9) if the detector design is similar to that of BESIII.

Clinical regularities in acupuncture-moxibustion treatment of cancer pain in recent 30 years

Objective: To explore the clinical regularities in acupuncture-moxibustion treatment of cancer pain by reviewing the re leva nt studies published betwee n 1985 and 2017. Methods: Based on the Chinese Medicine Acupuncture-moxibustion Information Database, quantitative analysis, correlation an alysis and Chi-square test were applied to an a lyze the comm only used acupoi nts, meridia n affiliatio ns and body regi on distributi ons, comm only used methods and acupoi nt correlati ons, treatme nt method correlati ons, the efficacy of acupuncture- moxibusti on plus the three-step an algesic ladder for can cer pain, and in dicators. Results: Zusanli (ST 36), Ashi point and Sanyinjiao (SP 6) ranked the top on the list of frequency;points from Bladder Meridian of Foot Taiyang and Stomach Meridian of Foot Yangming were often used;points from the lower limbs and back had high frequencies. The most commonly used treatment method was acupuncture-moxibustion plus medication. Acupuncture-moxibusti on plus the three-step an algesic ladder showed certai n adva ntage compared with the two methods used separately, and among the integrated methods, acupoint application plus the three-step analgesic ladder produced the most significant efficacy. It took (44.77±55.54) min for the analgesic effect to act and the effect lasted for (12.81±14.59) h. Numerical rati ng scale (NRS), visual an alog scale (VAS) and Kar nofsky performa nee status (KPS) scores all showed sign ifica nt changes after interventions (all P<0.01);there was no significant change in the score of quality of life (QOL) after interventions (P>0.05). Conclusion: Zusa nli (ST 36), Ashi point and Sanyin jiao (SP 6) are comm only selected in acup un cture-moxibusti on treatment of cancer pain;acupuncture and acupoint application are often used;acupuncture-moxibustion plus the three-step an algesic ladder can boost the treatme nt efficacy.