Nondestructive and active interrogation system for special nuclear material:proof of principle and initial results

Herein,we employ the threshold energy neutron analysis(TENA)technique to introduce the world's first active interrogation system to detect special nuclear materials(SNMs),including U-235 and Pu-239.The system utilizes a DD neutron generator based on inertial electrostatic confinement(IEC)to interrogate suspicious objects.To detect secondary neutrons produced during fission reactions induced in SNMs,a tensioned metastable fluid detector(TMFD)is employed.The current status of the system's development is reported in this paper,accompanied by the results from experiments conducted to detect 10 g of highly enriched uranium(HEU).Notably,the experimental findings demonstrate a distinct difference in the count rates of measurements with and without HEU.This difference in count rates surpasses two times the standard deviation,indicating a confidence level of more than 96% for identifying the presence of HEU.The paper presents and extensively discusses the proof-of-principle experimental results,along with the system's planned trajectory.

Reliable transmission of consultative committee for space data systems file delivery protocol in deep space communication

In consultative committee for space data systems（CCSDS） file delivery protocol（CFDP） recommendation of reliable transmission,there are no detail transmission procedure and delay calculation of prompted negative acknowledge and asynchronous negative acknowledge models.CFDP is designed to provide data and storage management,story and forward,custody transfer and reliable end-to-end delivery over deep space characterized by huge latency,intermittent link,asymmetric bandwidth and big bit error rate（BER）.Four reliable transmission models are analyzed and an expected file-delivery time is calculated with different trans-mission rates,numbers and sizes of packet data units,BERs and frequencies of external events,etc.By comparison of four CFDP models,the requirement of BER for typical missions in deep space is obtained and rules of choosing CFDP models under different uplink state informations are given,which provides references for protocol models selection,utilization and modification.

Special Lie symmetry and Hojman conserved quantity of Appell equations in a dynamical system of relative motion

Special Lie symmetry and the Hojman conserved quantity for Appell equations in a dynamical system of relative motion are investigated. The definition and the criterion of the special Lie symmetry of Appell equations in a dynamical system of relative motion under infinitesimal group transformation are presented. The expression of the equation for the special Lie symmetry of Appell equations and the Hojman conserved quantity, deduced directly from the special Lie symmetry in a dynamical system of relative motion, are obtained. An example is given to illustrate the application of the results.

Development of Standard Examination System of Special Course for Remote Education

Standard examination is an effective approach to promote the teaching quality of modern education. On terms of the analysis of main target, function and constitution of special course examination system for remote education, the internet scheme of the examination system is given according to the students and teachers' requirements. The implementation method for the communication and dynamic production of tests on home page of the exam system are elaborated by using programming technology of Active Server Pages (ASP)3.0. The query of exam information and automatic marking of test questions can be easily realized by the developed exam system under World Wide Web enviromment according to users' requirements.

Calibration of split Hopkinson pressure bar system with special shape striker

In order to present basic guidance for system calibration of split Hopkinson pressure bar(SHPB) with the special shape striker,wave characteristics and dynamic responses of SHPB under striker impact were analyzed.Stress generated by the special shape striker tends to have a half-sine waveform and has little wave dispersion during its propagation.Impact velocities of the special shape striker and peak values of generated stress still have linear relation but with a different coefficient from that of cylindrical strikers.From stress histories on the surfaces of the input bar impacted by the special shape striker off-axially and obliquely,it is found that the misalignment impacts usually trigger wave distortion and amplitude decrease,which can be used to identify the poor system adjustment.Finally,the system calibration of SHPB with the special shape striker can be classified into four steps:system adjustment,wave distortion identification,measurement calibration and transmission calibration,where the measurement calibration factor and transmission calibration factor are elaborated and redefined.

Special Issue on "Recent Advances in Power System Control" for International Journal of Control,Automation,and Systems

Today the high quality power supply is of essential in the economic development in a country. With the development of modem power systems and increasing demand for power supply, the electric power industry is facing a great challenge in meeting the increased load demand with highest reliability and security with minimum transmission expenditure. Power system stability analysis and control is one of the most important issues in power systems. The problem becomes more and more serious in power systems with the development of modem power systems. The ability of a power system

Guest Editorial for Special Issue on Fractional Order Systems and Controls

I.INTRODUCTION FRACTIONAL calculus has been applied in all MAD(modeling,analysis and design)aspects of control systems engineering since Shunji Manabe’s pioneering work in early 1960s.The 2016 International Conference on Fractional Differentiation and Its Applications(ICFDA)was held in Novi Sad,Serbia,July 18-20.Quoting from the

A Three-Dimensional Model for Special Ecological Agricultural System (SEAS) in the Southeast Fujian Province

Although the southeast Fujian Province has favorable bio-climatic conditions, traditional farming models are limited in effective exploitation of agriculture related resources and have deteriorated the agricultural environment. After analyzing the conditions at Maping town, we designed a three-dimensional model, special ecological agricultural system (SEAS), at Maping town. The SEAS has been practiced for three years and results show that the SEAS more efficiently utilizes local time and space resources and gains more econo- mic, ecological and social benefits. Thus, the SEAS has been considered as an optimal model for sustainable utilization of agricultural resources.

Design and Realization of Information System for Ningxia Sci-tech Special Commissioners

The information system for Ningxia sci-tech special commissioners is an application system for realizing information collection,management and sharing in the entrepreneurial process of sci-tech special commissioners. This paper introduces overall design ideas,system functions,key technologies and realization methods of the information system for Ningxia sci-tech special commissioners. Completion of construction and coming into operation of the information system bring new breakthrough for information management and data statistics of sci-tech special commissioners.

Test a Queue Detection System for Special Events in Nevada

Queue detection systems have been used in traffic management in work zones and have also been recommended for traffic control for special events like sports and conventions. However, they have not been tested in the field. This paper presents the results of tests for a queue detection system at two special events in Las Vegas, Nevada. The system consisted of two vision detectors, radio frequency communications and one changeable message sign. Two aspects of the system were evaluated: the effectiveness of the system in reducing speeds and the cost and effectiveness of its deployment. In the tests, traffic data such as queue length and vehicle operating speeds were collected and analyzed to see whether motorists respond congestion related message on the changeable message sign when they did not perceive the congestion. By this approach, the motorists’ true responses to the system were identified. The results indicated that motorists did make positive responses to the messages provided by the system. However, it was found that the system may not be cost-effective because significant costs would be incurred in purchasing, installation and maintenance of the system. Recommendations were provided to utilize existing message signs and detectors to provide the same information to motorists as a queue detection system does.

The founding of the Special Committee of Seismological Fluids，SSC and the First Academic Exchange Conference held in Guiyang

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JDIS Special Issue on Networked Knowledge Organization Systems(NKOS)

NKOSis devoted to the discussion of the functional and data model for enabling knowledge organization systems/services(KOS),such as classification systems,thesauri,gazetteers,and ontologies,as networked interactive information services to support the description and retrieval of diverse information resources through the Internet.These tools help to model the underlying semantic structure of a domain for purposes of information retrieval,knowledge discovery,language engineering,and the Semantic Web.NKOS workshops have been held since 1997 in conjunction with related professional and digital library meetings in the U.S.,Europe and Asia.The purpose of the workshops is to bring together KOS researchers and practitioners to share work on projects,good practices and innovations,and to discuss and critique this work.Workshops focus on topics including domain modeling,terminology development,validation,automated indexing,annotation and enrichment,and ethics.This JDIS special issue includes a selection of papers developed from presentations at the NKOS Workshop held at the Korean National Library in Seoul on September 26,2019 as part of the International Conference on Dublin Core and Metadata Applications 2019(DCMI-2019).In the spirit of the NKOS workshops,these papers include research in process,reports on projects,and“thought experiments”.

Preface to the Special Issue on Quantum Transport in Mesoscopic Systems

Mesoscopic systems,including nanowires,quantum dots and two-dimensional electron gases,are excellent platforms for studying emerging quantum phenomena,especially in the field of electrical transport.Quantum transport covers vast scopes of condensed matter physics,such as superconductivity,quantum Hall effect,and many investigations in mesoscopic devices.

Global Topological Structure of a Class of Plane Homogeneous Fifth System with Six Special Direction

In this paper, a class of plane homogeneous fifth system with six special direction is studied, and the global topological classification and coefficient conditions is discussed.

Systematic Investigation of Two-Phase Flow in Special Channels

A systematic study of two-phase(water-air)currents in open channels(water-air)has been conducted by means of experiments and numerical simulations.A dedicated device has been designed and manufactured on purpose.The numerical simulations have been based on the solution of a system of mass,momentum and energy balance equations for a two-phase fluid.The effect of different influential parameters has been explored,namely,velocity and dimensions of the channel,surface pressure and tension.

Guest Editorial for Special Issue on Cyber-Physical Systems

Ⅰ.Introduction CYBER-PHYSICAL system is a system of collaborating computational elements to control physical entities.The coordination and the tight link between computational,virtual and physical resources in cyber-physical system will have a pervasive effect on our everyday life.The development of cyber-physical system will create new opportunities for the introduction of services that will enhance the quality of life

Special Section on Energy-Efficient Technologies:NoC Circuits, Architectures, and Systems

Energy consumption has been one of the major challenges and concerns for the electronic devices design, especially in high-performance multi- and many-core systems. A highly integrated many-core chip is prone to be extremely high-power consumption that exceeds the chip＇s power budget set leaded by cooling, packaging and/or the capacity of the power supply. When this situation happens, various parts of the many-core chip will have to be deliberately switched off （darkened） so that the chip is still in compliance with its power budget, which is referred as ＂dark silicon＂. Therefore, the research on energy efficient computing is a current trend and will continue to be an active area in the coming years.

Special Section on Green Technologies: Energy-Efficient Circuits, Systems, and Devices

Green technologies refer to environmentally sustainable approaches to our daily lifestyle, industry, computing, IT, and literally everything. As the enabling technology, the electronics, including circuits, systems, and devices, are the key areas of research interests in green technologies. To be green means lower power and higher energy efficiency in the user＇s side and better management of energy sources in the provider＇s side. In the recent several years, the energy-efficient devices, circuits, and systems have received considerable attention in both academia and industry. It has been a clear trend that it is and will continue to be an area of extensive research interests in the coming years. In connection with the above view, and being invited by the Editor, Ms. Jasmine Xuan Xie, we have proposed this Special Section on Green Technologies：