Speed

摘要： It is desirable to fabricate materials with adjustable physical properties that can be used in different industrial applications.Since the property of a material is highly dependent on its inner structure,the understanding of structure–property correlation is critical to the design of engineering materials.3D printing appears as a mature method to effectively produce micro-structured materials.In this work,we created different stainless-steel microstructures by adjusting the speed of 3D printing and studied the relationship between thermal property and printing speed.Our microstructure study demonstrates that highly porous structures appear at higher speeds,and there is a nearly linear relationship between porosity and printing speed.The thermal conductivity of samples fabricated by different printing speeds is characterized.Then,the correlation between porosity,thermal conductivity,and scanning speed is established.Based on this correlation,the thermal conductivity of a sample can be predicted from its printing speed.We fabricated a new sample at a different speed,and the thermal conductivity measurement agrees well with the value predicted from the correlation.To explore thermal transport physics,the effects of pore structure and temperature on the thermal performance of the printed block are also studied.Our work demonstrates that the combination of the 3D printing technique and the printing speed control can regulate the thermophysical properties of materials.

摘要： Purpose–This study aims to analyze the development direction of train speed,density and weight in China.Design/methodology/approach–The development of China’s railway in the past 40 years can be divided into 3 stages.At the stage of potential tapping and capacity expansion,it is important to improve the train weight and density by upgrading the existing lines,and improving transportation capacity rapidly.At the stage of railway speed increase,the first priority is to increase train speed,reduce the travel time of passenger train,and synchronously take into account the increase of train density and weight.At the stage of developing high-speed railway,train speed,density and weight are co-developing on demand.Findings–The train speed of high-speed railway will be 400 km h
1,the interval time of train tracking will be 3 min,and the traffic density will be more than 190 pairs per day.The running speed of high-speed freight EMU will reach 200 km h
1 and above.The maximum speed of passenger train on mixed passenger and freight railway can reach 200 km h
1.The minimum interval time of train tracking can be compressed to 5 min.The freight train weight of 850 m series arrival-departure track railway can be increased to 4,500–5,000 t and that of 1,050 m series to 5,500–6,400 t.EMU trains should gradually replace ordinary passenger trains to improve the quality of railway passenger service.Small formation trains will operate more in intercity railway,suburban railway and short-distance passenger transportation.Originality/value–The research can provide new connotations and requirements of railway train speed,density and weight in the new railway stage.

摘要： 由于游戏键鼠同办公键鼠之间存在相对的通用性,所以也有部分厂商将在游戏外设中研发的技术或设计,挪用到产品推陈出新速度稍显缓慢的办公外设中,让其更符合时下用户的需要。雷蛇近期推出的Pro Type Ultra三模机械键盘便是这样的产品。具备宏录制功能的完全可编程按键且支持HYPERSPEED技术的它,与我们曾介绍的其他雷蛇游戏键盘有不少异曲同工之处,但在细节方面又为办公族们做出了优化,那么它在日常使用中的表现又会如何呢?

摘要： 天空版F1大赛这个概念早些年已有人提及,世上第一个飞行电动汽车大赛Airspeeden还曾定于去年举办(已延期)。主办方认为全球的电竞爱好者加上无人机赛事的粉丝,都是他们的潜在观众,若再配上赛事观摩媒介和技术的创新.

摘要： 罗技Ergo K860无线分体式键盘·系统最低要求:macOS 10.11/Windows 7·连接方式:LIGHTSPEED无线/蓝牙5.0·接收距离:10米·尺寸规格:223mm×456mm×48mm·重量:1160g·参考价:999元不夸张地说,对于码农和自媒体工作者,一款好的键盘绝对可以提升你日常的工作效率。

摘要： 每一辆SPEEDFIGHT都是驰骋于赛道的激情,也是穿梭于繁华都市的快乐。自1997年第一代SPEEDFIGHT推出以来,标致摩托致力于将其打造成一款专业的、激情四射的运动利器,并将精湛工艺完美融入到热血赛车之中。

摘要： 1.Introduction The Beijing–Zhangjiakou high-speed railway(HSR)is an important transport facility that will serve the Beijing 2022 Olympic Winter Games.Its main line is 174 km long,and its maximum design speed is 350 km·h^(-1).It is the world’s first HSR to be designed based on the concept of an intelligent railway.Construction of the Beijing-Zhangjiakou HSR began on 29 April 2016,and the line was put into operation on 30 December 2019.

摘要： Aligning billions of reads generated by the next-generation sequencing(NGS)to reference sequences,termed“mapping”,is the time-consuming and computationally-intensive process in most NGS applications.A Fast,accurate and robust mapping algorithm is highly needed.Therefore,we developed the FANSe3 mapping algorithm,which can map a 30×human wholegenome sequencing(WGS)dataset within 30 min,a 50×human whole exome sequencing(WES)dataset within 30 s,and a typical mRNA-seq dataset within seconds in a single-server node without the need for any hardware acceleration feature.Like its predecessor FANSe2,the error rate of FANSe3 can be kept as low as 10-9 in most cases,this is more robust than the Burrows-Wheeler transform-based algorithms.Error allowance hardly affected the identification of a driver somatic mutation in clinically relevant WGS data and provided robust gene expression profiles regardless of the parameter settings and sequencer used.The novel algorithm,designed for high-performance cloud-computing after infrastructures,will break the bottleneck of speed and accuracy in NGS data analysis and promote NGS applications in various fields.The FANSe3 algorithm can be downloaded from the website:http://www.chi-biote ch.com/fanse 3/.

摘要： 苹果发布iPhone 12、HomePod Mini等系列新产品2020年10月15日,来源CNN10月,苹果在其“Hi,Speed”秋季特别活动上正式推出了4款新iPhone:iPhone 12 Mini、iPhone 12、iPhone 12 Pro和iPhone 12 Pro Max。所有机型均支持5G,搭载A14仿生芯片,且改进了相机功能。与过去几年相比,此次发布的机型细分程度更局。

摘要： In this article, the author tentatively proves the idea common reader can improve reading abilityby practicing their eyeball. Everybody knows that in English learning field, reading is a big problem. Although many scientists try hard to find a way to overcome it, most learners cannot keep on reading. If there isa kind of easy and effective way that can well motivate the learners, the students can learn foreign languagemore happily and confidently. So the author uses this method to help the students to get the success as quicklyas possible, so that they can get the confidence and more. The author used the computer and a soft that a pictore moves all the time from left to right. By this way, the author wants to train the students' eyeball ability.And then he fastened the speed little by little and help the students to master the scientific rule of the eyeballmovement practicing. The author held a three-step-experiment. Each step includes methods and tests. Aftereach step, according to the result of the test, the author improved the method. Finally, the author proved theidea.

摘要： 本发明公开了一种基于迭代的SPEED快速磁共振成像方法,本发明主要包括六个步骤：k空间数据采集、填零重建、鬼影定位、基于双层鬼影模型的SPEED图像重建、生成高分辨率图像、迭代。填零重建包含三个步骤：两组欠采样数据的填零重建、差分变换和k空间中心数据填零重建成低分辨率图像，鬼影定位包含三个步骤：差分变换、建立重叠鬼影图和确立鬼影阶数。基于双层鬼影模型的SPEED图像重建包含四个步骤：双层鬼影模型求解、重叠鬼影的分离、多个分离鬼影图像的配准求和、逆滤波重建。采用本发明方法，提高了SPEED方法的数据采集速度和鬼影定位的精度，获得更高的SPEED成像质量。

摘要： 本发明公开了一种基于k空间中心鬼影定位的SPEED磁共振成像方法,本发明主要包括九大步骤：k空间数据采集、填零傅立叶重建、差分变换、建立低分辨重叠鬼影图、鬼影阶数的确立、双层鬼影模型求解、鬼影的分离、多个鬼影映射图的配准求和、逆滤波重建。采用本发明方法可以将k空间中心部分数据用于SPEED成像时的鬼影阶数的定位，避免了常规SPEED成像方法的最小平方误差求解鬼影阶数的步骤，从而将所需采集的三组k空间欠采样数据减少到两组，进一步缩短了SPEED成像方法的数据采集时间。

摘要： 本发明公开了递进求解的P‑SPEED快速磁共振成像方法，将经典SPEED数据采集量减少到2组，进一步提高了SPEED成像的速度。通过递进的方法，首先利用单层信号模型获取初步的稀疏边缘鬼影图；接着利用初步的稀疏边缘鬼影图进行双层鬼影模型的鬼影阶数预测；再基于预测的鬼影阶数，进一步递进求解双层鬼影模型来分离鬼影，逆滤波重建出高质量MRI复数图像。此外，本发明还提出了针对递进求解的P‑SPEED快速磁共振成像方法的秩判据，以剔除低秩、导致双层鬼影模型求解出错的采样组合方式，有助于选择正确的P‑SPEED采样组合。实验结果表明，本方法减少数据采集量后，依然可以重建出高质量的复数磁共振图像。

摘要： 本发明公开了基于CUNet伪影定位的SPEED磁共振成像方法。针对现有SPEED磁共振快速成像方法因采集双组欠采样数据后求解双层伪影模型时伪影定位精度低，提出基于深度学习的方法定位SPEED成像中的伪影。包括数据采集和训练数据准备、CUNet网络的训练、基于CUNet网络的伪影定位、基于伪影定位的双组欠采样数据解析重建四个步骤。通过构建复数U型卷积神经网络，基于大数据学习的方法，利用采集到的所有欠采样k空间数据来定位伪影的阶数，能显著提高SPEED成像方法中伪影的定位精度，从而能更精确地分离和配准SPEED两组欠采样数据填零重建中的重叠伪影，高质量重建出复数磁共振图像，保留相位信息。

摘要： 本发明公开了一种基于奇异谱分析的SPEED快速磁共振成像方法,本发明包括k空间数据采集、填零重建、奇异谱分析重建、鬼影定位、基于双层鬼影模型的SPEED图像重建，采用本发明方法，通过对k空间中心数据进行奇异谱分析重建来抑制k空间中心数据直接填零重建带来的吉布斯环状伪影，基于不同分辨率图像都具有相位成片连贯性的特点，通过合成高质量的定位图像来提高鬼影定位的精度，进而提高了SPEED成像质量；通过鬼影定位方法，可将常规SPEED快速成像的数据采集组数减少三分之一，进一步提高了SPEED成像速度。

摘要： 本发明公开了一种基于迭代的SPEED快速磁共振成像方法,本发明主要包括六个步骤：k空间数据采集、填零重建、鬼影定位、基于双层鬼影模型的SPEED图像重建、生成高分辨率图像、迭代。填零重建包含三个步骤：两组欠采样数据的填零重建、差分变换和k空间中心数据填零重建成低分辨率图像，鬼影定位包含三个步骤：差分变换、建立重叠鬼影图和确立鬼影阶数。基于双层鬼影模型的SPEED图像重建包含四个步骤：双层鬼影模型求解、重叠鬼影的分离、多个分离鬼影图像的配准求和、逆滤波重建。采用本发明方法，提高了SPEED方法的数据采集速度和鬼影定位的精度，获得更高的SPEED成像质量。

摘要： 本发明公开了一种基于k空间中心鬼影定位的SPEED磁共振成像方法,本发明主要包括九大步骤：k空间数据采集、填零傅立叶重建、差分变换、建立低分辨重叠鬼影图、鬼影阶数的确立、双层鬼影模型求解、鬼影的分离、多个鬼影映射图的配准求和、逆滤波重建。采用本发明方法可以将k空间中心部分数据用于SPEED成像时的鬼影阶数的定位，避免了常规SPEED成像方法的最小平方误差求解鬼影阶数的步骤，从而将所需采集的三组k空间欠采样数据减少到两组，进一步缩短了SPEED成像方法的数据采集时间。

摘要： 本发明公开了一种实现USB2.0High Speed控制发包的测试方法，包括以下步骤：1)、控制脚本发送api调用指令给PCH中的controller；2)、controller接到指令后进入测试模式，自动发送待测port码型；3)、USB2.0测试治具连接到服务器，测试待测port；4)、差分探头连接到USB2.0测试治具上，获取波形文档；5)、高速示波器抓取和分析波形文档；6)、根据对应模板比较，判断该port是否满足规范。本发明省去了服务器主板连接网卡，并通过电脑远程控制系统发包的过程，节省人力、资源和时间，提高了测试效率。

摘要： 本发明提供一种提升服务器SPEC CPU speed测试成绩的方法，所述服务器内设有多个CPU，多个核心处理器，采用如下步骤：S1.第一CPU获取核心数调整范围；S2.第一CPU在核心数调整范围内限制开启的核心数量，以强制提高单核心的运行频率；S3.在选定的核心数下，搭建SPEC CPU的运行环境，配置运行文件名选择speed；S4.运行SPEC CPU进行测试，得到测试成绩。本发明内容易于实现，对服务器相应性能测试结果提升明显，无需对硬件及软件系统做任何调整，仅通过对BIOS的调整就可以实现，同其他方式相比限制条件较少。

摘要： 本发明公开针对于多时钟域at‑speed测试的OCC电路，包括多个捕获时钟门控单元ICG，对应根据有限状态机所产生的两个捕获使能信号以及测试固定故障所用的慢速捕获时钟使能信号，在两个时域时钟信号以及测试时钟信号的基础上，产生对应不同捕获模式下需要的时钟信号以及测试时钟信号；选择控制单元，与捕获时钟门控单元ICG连接，包括提供两路捕获时钟切换选择的第一选择器、提供移位和捕获时钟选择的第二选择器、提供慢速测试时钟和实速测试时钟的选择的第三选择器以及提供工作时钟和测试时钟选择的第四选择器。本发明能够提高测试模式的故障覆盖率，从而减少在芯片测试过程中逃逸的几率，提高芯片测试的良率。