neutron

摘要： The existence of the neutron, originally postulated to justify the stability of the nucleus, is very similar to the postulation of Dark Matter to give stability to galaxies and galaxy clusters. However, the existence of the neutron has been proven as an important part of the nucleus that is linked within its integral structure in the Standard Model of Particle Physics. The Standard Model that began with the electron and the proton, currently, with more than one hundred particles, shows in some parts, cracks that induce to reconsider the veracity of the theories and models. Here it is established that all theories are to some extent false and therefore, so will any model, which is always a specific part of the theory. Also, like several other things, by means of a mathematical calculation, it is clarified why, it has not been possible to incorporate the Dark Matter within the Standard Model. Furthermore, it is reliably demonstrated that the introduction of the Dark matter postulate is superfluous and that the high speeds of stellar rotation determined experimentally are analytically explained with the stellar dynamics described here.

摘要： Supergiant fast X-ray transients are a sub-class of high mass X-ray binaries,in which the compact object is a neutron star and it is accreting materials from its non-degenerate companion star.The sample of supergiant fast X-ray transients from XMM-Newton public observations have been intensively studied,and hence the corresponding parameters for identifying X-ray flares have been obtained by Sidoli et al.,such as the rise time,the decay time,the duration time,the waiting time,the peak luminosity,the isotropic energy and the mean luminosity.In order to investigate the origin of the X-ray flares from the supergiant fast X-ray transients,we apply the cumulative distribution method with the power-law index dN(x)/dx∝(x+x0)-ax to the target sample.We then find that the relevant parameters can be well described by the cumulative distribution with indices 1.0-1.9 for IGR J16418-4532,IGR J16328-4726 and IGR J18450-0435,respectively.This finding indicates that the X-ray flares are likely to be produced by the self-organizing critical process,one possible scenario may be due to reconnection in magnetized stellar wind blobs approaching into the magnetosphere of magnetized neutron star.Therefore,we suggest that the high mass X-ray binaries with similar X-ray flares likely belong to the self-organized criticality systems.

摘要： A miniaturized neutron spin flipper based on a high-TC superconductor film,developed at the China Spallation Neutron Source(CSNS),is presented.A neutron spin flipper is an essential component for performing polarized neutron experiments and,as such,constitutes a high priority for developing CSNS’s polarized neutron capability.To provide the beamlines with a universal neutron spin flipper operating over a wide wavelength band,the neutron spin flipper utilizes non-adiabatic spin flipping during transit through opposite magnetic fields that are mutually shielded by the superconductor Meissner effect.A compact vacuum heat shield and a low-power consumption sterling refrigerator maintained the superconducting condition while reducing the size and power input of the flipper.The prototype device was tested at the CSNS BL-20,which demonstrated a flipping efficiency of 99%at 4 A°.

摘要： 云计算(CloudComputing)是信息时代虚拟化、网络化、共享化的重要产物.目前Openstack架构是较流行的云计算核心架构,作为一种开源架构,被广泛应用.下文就以Openstack为核心的云计算结构做简要介绍,帮助大家了解云计算基础结构知识的同时简要介绍云计算的一些应用实践场景和应用优势.

摘要： 针对容器编排引擎Kubernetes缺乏官方的、统一的网络解决方案,以及各种第三方网络插件在网络性能及网络配置管理方面的局限性,提出一种新型Kubernetes网络方案——基于CNI的网络插件N-Net.首先,提出一种新型网络插件架构,将Kubernetes与Neutron、Keystone有机结合,保障Kubernetes集群的网络通信;其次,创新性的提出一种深度定制Pod网络的方法,能够根据业务场景需求实现对Pod的IP地址静态分配;最后,对Neutron的底层网络结构进行优化,提高Kubernetes集群网络性能.实验结果表明,在网络功能方面,N-Net可以为Kubernetes集群网络提供支持.在网络性能方面,N-Net与Flannel、Kuryr两种网络方案相比,TCP吞吐量在同宿主机情况下分别提升了1.44倍和1.69倍,跨宿主机情况下分别提升了1.43倍和1.63倍;网络延迟在同宿主机的情况分别下降了23％、29％,跨宿主机的情况下分别下降了22％、28％.

摘要： BACKGROUND Liver cancer is the 6 th most common cancer in the world and the 4 th most common death from cancer worldwide.Hepatic radioembolization is a minimally invasive treatment involving intraarterial administration of radioembolic microspheres.AIM To develop a neutron-activated,biodegradable and theranostics samarium-153 acetylacetonate(153SmAcAc)-poly-L-lactic acid(PLLA)microsphere for intraarterial radioembolization of hepatic tumors.METHODS Microspheres with different concentrations of 152SmAcAc(i.e.,100%,150%,175%and 200%w/w)were prepared by solvent evaporation method.The microspheres were then activated using a nuclear reactor in a neutron flux of 2×10^12n/cm^2/s^1,converting 152Sm to Samarium-153(153)Sm)via 152Sm(n,γ) 153Sm reaction.The SmAcAc-PLLA microspheres before and after neutron activation were characterized using scanning electron microscope,energy dispersive X-ray spectroscopy,particle size analysis,Fourier transform infrared spectroscopy,thermo-gravimetric analysis and gamma spectroscopy.The in-vitro radiolabeling efficiency was also tested in both 0.9% sodium chloride solution and human blood plasma over a duration of 550 h.RESULTS The SmAcAc-PLLA microspheres with different SmAcAc contents remained spherical before and after neutron activation.The mean diameter of the microspheres was about 35μm.Specific activity achieved for 153SmAcAc-PLLA microspheres with 100%,150%,175%and 200%(w/w)SmAcAc after 3 h neutron activation were 1.7±0.05,2.5±0.05,2.7±0.07,and 2.8±0.09 GBq/g,respectively.The activity of per microspheres were determined as 48.36±1.33,74.10±1.65,97.87±2.48,and 109.83±3.71 Bq for 153SmAcAc-PLLA microspheres with 100%,150%,175%and 200%(w/w)SmAcAc.The energy dispersive X-ray and gamma spectrometry showed that no elemental and radioactive impurities present in the microspheres after neutron activation.Retention efficiency of 153Sm in the SmAcAc-PLLA microspheres was excellent(approximately 99%)in both 0.9%sodium chloride solution and human blood plasma over a duration of 550 h.CONCLUSION The 153SmAcAc-PLLA microsphere is potentially useful for hepatic radioembolization due to their biodegradability,favorable physicochemical characteristics and excellent radiolabeling efficiency.The synthesis of the formulation does not involve ionizing radiation and hence reducing the complication and cost of production.

摘要： 本文通过开源的OpenStack构建Neutron网络系统,完成数据的路由转发,分析Neutron网络的数据流.

摘要： In this White Paper we present the potential of the Enhanced X-ray Timing and Polarimetry (eXTP) mission for determining the nature of dense matter;neutron star cores host an extreme density regime which cannot be replicated in a terrestrial laboratory. The tightest statistical constraints on the dense matter equation of state will come from pulse profile modelling of accretion-powered pulsars, burst oscillation sources, and rotation-powered pulsars. Additional constraints will derive from spin measurements, burst spectra, and properties of the accretion flows in the vicinity of the neutron star. Under development by an international Consortium led by the Institute of High Energy Physics of theChinese Academy of Sciences, the eXTP mission is expected to be launched in the mid 2020s.

摘要： 基于多租户环境的Kubernetes与Neutron对接方法，包括以下步骤：创建租户Service，Kubernetes集群租户中的用户创建对应的租户Service；分配虚拟IP，controller根据租户Service通过Neutron创建对应的Loadbalancer，并从用户对应租户的Service CIDR中分配虚拟IP给Loadbalancer，将Loadbalancer的IP保存至租户Service对象；创建对应资源，根据租户Service的Protocol、Port、Endpoints在Neutron中创建对应的Listener、Member Pool、Members。本发明还涉及存储介质、电子设备。本发明通过创建租户Service，由各租户的OpenStack Neutron LBaaS分配租户Service的IP，同时Service的负载均衡由LBaaS的Loadbalancer提供，实现各租户的Service能够利用租户自己的LBaaS服务，而且各租户能够单独为各自Service设置IP段。

摘要： 基于Neutron和GBP的网络访问控制方法，包括步骤：容器云平台创建Partition，监听创建Partition事件，获取令牌，在Openstack创建与用户输入的L3Policy关联的L2Policy，通过L2Policy创建Network，通过Network创建Subnet，指定Subnet Pool为L3Policy的Subnet Pool，创建与L2Policy和Subnet对应的Policy Target Group；将GBP的资源与Openstack的资源关联。本发明通过Openstack与GBP对接，实现Kubernetes集群租户网络隔离、租户的容器组之间网络通断控制、租户内容器组和虚拟机组之间网络通断控制、租户内容器的带宽控制。

摘要： 本发明属于云计算技术领域，具体涉及一种与OpenStack Neutron融合的Kubernetes网络插件方法。本发明包括：设计一种基于Neutron的容器网络插件，从Kubernetes的CNI容器网络模型出发，为Neutron实现CNI模型接口，在Kubernetes中使用所述插件，将容器网络建立在Neutron的虚拟网络中，实现Kubernetes与OpenStack的网络融合。本发明在网络插件的基础上，提供了基于Load Balancer实例实现Kubernetes中service服务的解决方案，以OpenStack的Octavia项目为基础，将Kubernetes中的service服务转化为Load Balance实例，为后端容器提供了对外稳定的访问入口，实现了前后端解耦，提高了系统的可靠性。本发明能解决在虚拟机与容器资源融合的应用场景下网络资源的融合问题，并保障高并发情况下云平台的资源吞吐量。

摘要： 基于多租户环境的Kubernetes与Neutron对接方法，包括以下步骤：创建租户Service，Kubernetes集群租户中的用户创建对应的租户Service；分配虚拟IP，controller根据租户Service通过Neutron创建对应的Loadbalancer，并从用户对应租户的Service CIDR中分配虚拟IP给Loadbalancer，将Loadbalancer的IP保存至租户Service对象；创建对应资源，根据租户Service的Protocol、Port、Endpoints在Neutron中创建对应的Listener、Member Pool、Members。本发明还涉及存储介质、电子设备。本发明通过创建租户Service，由各租户的OpenStack Neutron LBaaS分配租户Service的IP，同时Service的负载均衡由LBaaS的Loadbalancer提供，实现各租户的Service能够利用租户自己的LBaaS服务，而且各租户能够单独为各自Service设置IP段。

摘要： 基于Neutron和GBP的网络访问控制方法，包括步骤：容器云平台创建Partition，监听创建Partition事件，获取令牌，在Openstack创建与用户输入的L3Policy关联的L2Policy，通过L2Policy创建Network，通过Network创建Subnet，指定Subnet Pool为L3Policy的Subnet Pool，创建与L2Policy和Subnet对应的Policy Target Group；将GBP的资源与Openstack的资源关联。本发明通过Openstack与GBP对接，实现Kubernetes集群租户网络隔离、租户的容器组之间网络通断控制、租户内容器组和虚拟机组之间网络通断控制、租户内容器的带宽控制。

摘要： 本申请公开了一种基于neutron分层机制的调度方法,所述方法包括当获取到待分配计算节点的虚拟机时，基于若干计算节点中的各计算节点各自对应的剩余虚拟局域网数量，确定若干候选计算节点；获取各候选计算节点各自对应的计算资源权重，并基于各候选计算节点各自对应的剩余虚拟局域网数量，确定各候选计算节点各自对应的虚拟局域网权重值；基于各候选计算节点各自对应的虚拟局域网权重值以及计算资源权重，确定所述虚拟机对应的目标计算节点，并将该目标计算节点分配给该虚拟机。本申请通过基于剩余虚拟局域网数量对VLAN进行筛选，去除VLAN资源已经分配完毕的计算节点，避免调度失败问题。

摘要： 本申请公开了一种基于neutron分层机制的调度方法,所述方法包括当获取到待分配计算节点的虚拟机时，基于若干计算节点中的各计算节点各自对应的剩余虚拟局域网数量，确定若干候选计算节点；获取各候选计算节点各自对应的计算资源权重，并基于各候选计算节点各自对应的剩余虚拟局域网数量，确定各候选计算节点各自对应的虚拟局域网权重值；基于各候选计算节点各自对应的虚拟局域网权重值以及计算资源权重，确定所述虚拟机对应的目标计算节点，并将该目标计算节点分配给该虚拟机。本申请通过基于剩余虚拟局域网数量对VLAN进行筛选，去除VLAN资源已经分配完毕的计算节点，避免调度失败问题。

摘要： 本发明公开一种neutron虚拟网络流量控制方法及装置，其中，该方法包括：引入linux TC的ifb虚拟网卡；配置无分类队列规则，将进入集成网桥的入口方向流量导入ifb虚拟网卡中；根据业务需要配置分类队列规则，对ifb虚拟网卡的出口方向流量进行分类配置；配置过滤器将ifb虚拟网卡的流量导入按照业务配置的分类中。该方法及装置通过引入linux TC的ifb虚拟网卡，将进入虚拟交换机的流量方向由入口方向转换为出口方向，达到在流量入口处实现精确地控制管理目的。

摘要： 本发明实施例公开了一种虚拟化管理平台中neutron网络异常处理的方法及装置，其中，所述方法包括：在发生neutron网络异常时，虚拟化管理平台获取neutron服务发送的异常信息，所述异常信息包括错误码和所述错误码对应的参数；所述虚拟化管理平台记录所述错误码和所述参数。本发明实施例增强了虚拟化管理平台的易用性。

摘要： 本发明提供一种实现neutron网络跨网段数据转发方法及流量可控的方法,包括如下步骤：设置Open Flow协议在Open Flow交换机中添加相关流表；通过查询流表处理接收到报文，根据对应的流表项，将数据转发到相应的端口，完成整个Open Flow网络的数据转发。本文通过Open Flow网络模型，使用Open Flow控制器集中控制Neutron网络流量。同时针对Open Flow协议在跨网段数据转发方面的不足，在当前Open Flow协议基础上添加处理ARP和ICMP报文的动作函数，使Open Flow协议能正常响应ARP包和三层数据包ICMP，能在不同网段之间进行数据转发，从而更好的控制Neutron网络的数据流量。