摘要：Silicon neutron transmutation doping remains one of the most viable nuclear applications for research *** this kind of product involves an irradiation method capable of fulfilling the quality requirements of doping and alleviating the challenges related to the design and safety of the irradiation *** this paper,we propose an irradiation device prototype for neutron transmutation doping of silicon ingots with diameters of 2 to 3 *** on the Es-Salam research *** thermal hydraulic analysis of the proposed irradiation device was performed to determine the optimum conditions for *** effect of the mechanical vibrations induced by the circulation of coolant in the device was quantified via experimental measurements under different flow *** results show that the maximum temperature reached by the silicon ingots is below the temperature limit,effectively validating the design of the irradiation *** investigations are prospected to further optimize the design and the irradiation *** irradiation of silicon ingots with a large diameter will be considered.

摘要：The demand of high-end electromagnetic wave absorbing materials puts forward higher requirements on comprehensive performances of small thickness,lightweight,broadband,and strong ***,a novel multi-layer stepped metamaterial absorber with gradient electromagnetic properties is *** complex permittivity and permeability of each layer are tailored via the proportion of carbonyliron and carbon-fiber dispersing into the epoxy *** proposed metamaterial is further optimized via adjusting the electromagnetic parameters and geometric sizes of each *** with the four-layer composite with gradient electromagnetic properties which could only realize reflection loss(RL)of less than−6 dB in 2.0-40 GHz,the optimized stepped metamaterial with the same thickness and electromagnetic properties realizes less than−10 dB in the relevant frequency ***,the RL of less than−15 dB is achieved in the frequency range of 11.2-21.4 GHz and 28.5-40 *** multiple electromagnetic wave absorption mechanism is discussed based on the experimental and simulation results,which is believed to be attributed to the synergy effect induced by multi-scale structures of the ***,combining multi-layer structures and periodic stepped structures into a novel gradient absorbing metamaterial would give new insights into designing microwave absorption devices for broadband electromagnetic protections.

摘要：Multispectral and polarization cameras that can simultaneously acquire the spatial,spectral,and polarization characteristics of an object have considerable potential applications in target detection,biomedical imaging,and remote *** this work,we develop a common-aperture optical system that can capture multispectral and polarization *** off-axis three-mirror optical system is mounted on the front end of the proposed system and used as a common-aperture telescope in the visible light(400 nm-750 nm)and long-wave infrared(LWIR,8μm-12μm)*** system can maintain a wide field of view(4.5°)and it can demonstrate an enhanced identification *** off-axis three-mirror system gets rid of central obscuration while further yielding stable system resolution and *** that has passed through the front-end common-aperture reflection system is divided into the visible light and LWIR waveband by a *** two wavebands then converge on two detectors through two groups of *** simulation results indicate that the proposed system can obtain clear images in each waveband to meet the diverse imaging requirements.

摘要：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.

摘要：目的:通过引入坡变换,揭示表面测量中形态学操作的本质。创新点:引入坡变换,将空间域的形态学膨胀操作转换为坡域的加法操作,揭示结构元素对表面轮廓坡度和曲率的改变。方法:1.基于坡变换理论,空间域的切膨胀操作对应于坡域的加法操作(图9);2.分析圆结构元素作用于正弦波和圆的理论解;3.用不同半径的圆结构元素作用于正弦波,分析切膨胀和经典膨胀的相同和不同之处。结论:1.坡变换将形态学操作从空间域转换到坡域,可获取类似于傅立叶变换将卷积操作从空间域转换到频域的分析能力;2.切膨胀操作为经典膨胀操作的上确界,但会产生重叠区域。

摘要：The last decade or so has seen the development of refined performance-based earthquake engineering(PBEE) approaches that now provide a framework for estimation of a range of important decision variables,such as repair costs,repair time and number of casualties. This paper reviews current tools for PBEE,including the PACT software,and examines the possibility of extending the innovative displacement-based assessment approach as a simplified structural analysis option for performance assessment. Details of the displacement-based s+eismic assessment method are reviewed and a simple means of quickly assessing multiple hazard levels is proposed. Furthermore,proposals for a simple definition of collapse fragility and relations between equivalent single-degree-of-freedom characteristics and multi-degree-of-freedom story drift and floor acceleration demands are discussed,highlighting needs for future research. To illustrate the potential of the methodology,performance measures obtained from the simplified method are compared with those computed using the results of incremental dynamic analyses within the PEER performance-based earthquake engineering framework,applied to a benchmark building. The comparison illustrates that the simplified method could be a very effective conceptual seismic design tool. The advantages and disadvantages of the simplified approach are discussed and potential implications of advanced seismic performance assessments for conceptual seismic design are highlighted through examination of different case study scenarios including different structural configurations.

摘要：Acoustic one-way manipulations have recently attracted significant attention due to the deep implications in many diverse fields such as biomedical imaging and ***,the previous mechanisms of asymmetric manipulation of airborne sound need to use elaborate heavyweight structures and only work in certain frequency *** propose a mechanism for designing an ultra-lightweight and optically transparent structure with asymmetric transmission property for normally incident plane *** of fabricating solids into complicated artificial structures with limited bandwidth and heavy asymmetric shape which allows the incident plane wave weight,we simply use xenon to fill a spatial region of to pass along one direction while reflecting the reversed wave regardless of *** demonstrate both analytically and numerically its effectiveness of producing highly-asymmetric transmission within an ultra-broad *** design offers new possibility for the design of one-way devices and may have far-reaching impact on various scenarios such as noise control.

摘要：In order to achieve holistic urban plans incorporating transport infrastructure,public space and the behavior of people in these spaces,integration of urban design and computer modeling is a promising way to provide both qualitative and quantitative support to *** paper describes a systematic literature review following a four-part ***,to understand the relationship of elements of transport,spaces,and humans,w e review policy and urban design strategies for promoting positive ***,we present an overview of the integration methods and strategies used in urban design and policy ***,metrics and approaches for evaluating the effectiveness of integrated plan alternatives are ***,this paper gives a review of state-of-the-art tools with a focus on seven com puter simulation *** article explores mechanisms underlying the complex system of transport,spaces,and humans from a multidisciplinary perspective to provide an integrated toolkit for designers,planners,modelers and decision-m akers with the current methods and their challenges.

摘要：CFD is a ubiquitous technique central to much of computational simulation such as that required by aircraft *** of the Poisson equation occurs frequently in CFD and there are a number of possible approaches one may *** dynamical core of the MONC atmospheric model is one example of CFD which requires the solving of the Poisson equation to determine pressure *** this aspect of the model has been very time consuming and so it is important to consider how we might reduce the runtime *** this paper we survey the different approaches implemented in MONC to perform the pressure *** to take advantage of large scale,modern,HPC machines,we are concerned with the computation and communication behaviour of the available techniques and in this text we focus on direct FFT and indirect iterative *** addition to describing the implementation of these techniques we illustrate on up to 32768 processor cores of a Cray XC30 both the performance and scalability of our *** runtime is not the only measure so we also make some comments around the stability and accuracy of *** result of this work are a number of techniques,optimised for large scale HPC systems,and an understanding of which is most appropriate in different situations.