Extreme

摘要： SD内存卡作为普及率较高的相机内存卡,目前用户对其速度需求可以说越来越大。闪迪也在今年更新了旗下UHS-II格式的Extreme Pro系列SD存储卡,它符合Class 90(V90)的影片速度标准,最高支持300MB/s读取和260MB/s的写入速度,可以用于拍摄4K,甚至是8K的全高清影片,下面我们一起来看看这款产品有什么特点。

摘要： I.INTRODUCTION Strong interest in the modeling of planetary interiors,dwarf stars,and the physical conditions necessary to achieve inertial confinement fusion(ICF)have driven attention to the properties of matter at high density,temperature,and pressure(beyond the megabar limit).Extreme states of matter have been studied using gas guns,explosives,and Z-pinches,among other methods(see,e.g.,Refs.1–4).However in recent years,lasers have become the most reliable standard tool for creating extreme states of matter.

摘要： The ongoing COVID-19 pandemic is a reminder that a major public crisis on a global scale is an extreme problem facing all humanity.The global public crisis fundamentally threatens the security and common interests of all mankind.The increasingly serious climate and environment problems accompanying the large-scale industrialization have long held back all countries in the world,no matter affluent or poor.In recent years,2021 ranks as Earth’s fifth hottest year on record[1].The average global ocean temperature has broken historical records.The rise in temperature in 2021 is not a very accidental event.2020 tied with 2016 as the warmest year on record,with the past seven years being the hottest on record[2].

摘要： The Brightest from the Best:Top Graduates Working in Poverty Alleviation Authors:Wang Hong,Zhang Xiaolong Price:RMB 108Paperback,347 pages Published by Foreign Languages PressIn China,there is a group of young people who graduated from prestigious universities and are generally thought to be successful with promising careers.They chose to serve the poor and needy in impoverished areas,proactively participating in the hard-foughtbattle against extreme poverty and did their bit to make a difference in China’s rural areas.In their middle 20s and early 30s,they endured hardships and challenges rarely seen by their peers.Meanwhile,they have also discovered a great sense of fulfillment.These young people who are willing to devote themselves to the well-being of the public and to national development are a source of hope and pride for the nation.

摘要： Single-crystal x-ray diffraction(SCXRD)is an important tool to study the crystal structure and phase transitions of crystalline materials at elevated pressures.The Partnership for eXtreme Xtallography(PX^(2))program at the GSECARS 13-BM-C beamline of the Advanced Photon Source aims to provide state-of-the-art experimental capabilities to determine the crystal structures of materials under extreme conditions using SCXRD.PX^(2) provides a focused x-ray beam(12318μm^(2))at a monochromatic energy of 28.6 keV.High-pressure SCXRD experiments are performed with a six-circle diffractometer and a Pilatus3 photon-counting detector,facilitated by a membrane system for remote pressure control and an online ruby fluorescence system for pressure determination.The efficient,high-quality crystal structure determination at PX^(2) is exemplified by a study of pressure-induced phase transitions in natural ilvaite[CaFe^(2+)_(2 )Fe^(3+)Si_(2)O_(7)O(OH),P2_(1)/a space group].Two phase transitions are observed at high pressure.The SCXRD data confirm the already-known ilvaite-I(P2_(1)/a)→ilvaite-II(Pnam)transformation at 0.4(1)GPa,and,a further phase transition is found to occur at 22.8(2)GPa where ilvaite-II transforms into ilvaite-III(P2_(1)/a).The crystal structure of the ilvaite-III is solved and refined in the P2_(1)/a space group.In addition to the ilvaite-I→ilvaite-II→ilvaite-III phase transitions,two minor structural modifications are observed as discontinuities in the evolution of the FeO6 polyhedral geometries with pressure,which are likely associated with magnetic transitions.

摘要： Laser-driven neutron sources could offer a promising alternative to those based on conventional accelerator technologies in delivering compact beams of high brightness and short duration.We examine this through particle-in-cell and Monte Carlo simulations that model,respectively,the laser acceleration of protons from thin-foil targets and their subsequent conversion into neutrons in secondary lead targets.Laser parameters relevant to the 0.5 PW LMJ-PETAL and 0.6–6 PW Apollon systems are considered.Owing to its high intensity,the 20-fs-duration 0.6 PW Apollon laser is expected to accelerate protons up to above 100MeV,thereby unlocking efficient neutron generation via spallation reactions.As a result,despite a 30-fold lower pulse energy than the LMJ-PETAL laser,the 0.6 PW Apollon laser should perform comparably well both in terms of neutron yield and flux.Notably,we predict that very compact neutron pulses,of∼10 ps duration and∼100μm spot size,can be released provided the lead convertor target is thin enough(∼100μm).These sources are characterized by extreme fluxes,of the order of 10^(23) n cm^(−2) s^(−1),and even ten times higher when using the 6 PW Apollon laser.Such values surpass those currently achievable at large-scale accelerator-based neutron sources(∼10^(16) n cm^(−2) s^(−1)),or reported from previous laser experiments using low-Z converters(∼10^(18) n cm^(−2) s^(−1)).By showing that such laser systems can produce neutron pulses significantly brighter than existing sources,our findings open a path toward attractive novel applications,such as flash neutron radiography and laboratory studies of heavy-ion nucleosynthesis.

摘要： Since 2020,the resilience and flexibility of the global food system has been at stake because of the continuously raging COVID-19 pandemic,and multiple other factors including aggravating extreme climate events,protracted local conflicts and disturbances,as well as a weak world economy.The deficit of global development,of which food security is a major component,has become a common concern of the international community.

摘要： Marine environment is a harsh and challenging environment for both operators and analysers due to extreme weather conditions.As a result of these conditions,marine structures are subjected to extreme and/or cyclic loadings.

摘要： “2022广州国际音响唱片嘉年华”于7月30-31日在广州中国大酒店盛大开幕,华晖音响在活动的第一天发布了Estelon最新款旗舰音箱Estelon ExtremeMk Ⅱ。来自爱沙尼亚的Estelon无疑是近10年来Hi-End音响业界辩识度最高的扬声器制品,不同于绝大多数音箱方方正正或局部弧线的造型,Estelon犹如女神身段般的圆弧曲线音箱线条十分迷人,而且完全没有平行面、甚至每段截面形状面积都不同的组成,使得音箱内的声波共鸣降至最低,再加上顶级单元、内部线材与精心设计之分音器,使得Estelon音箱的音乐回放与外观同样出色。

摘要： 人们普遍认为沙漠是所有生命的禁区,然而,研究人员发现,在干燥的沙漠地带,竟然还生存着鱼类……篇幅:362词难度:★★★建议用时:7分钟~1How life manages to continue in unpredictable and extreme environments is a major question in evolution.For aquatic(水生的)animals,extreme environments include those with little water,such as the deserts of Central Australia.

摘要： 基于Extreme数学模型重构VI时间序列曲线的作物估产模型，属于农作物产量预测技术领域。本发明是为了解决现有作物估产中利用的遥感影像获取率低，导致因此建立的作物估产模型通用性差的问题。它首先采集待估产区作物整个生产期的遥感影像，并进行预处理；然后根据待估产区地块矢量图范围进行裁剪，获得裁剪图像中每个像元的植被指数VI时间序列曲线；再将VI时间序列曲线按照行为像元排序，获得裁剪图像的时期排序；采用数学模型Extreme对所有像元的植被指数VI时间序列曲线进行拟合；确定最优拟合VI，提取植被指数VI时间序列曲线的特征参数；最后获得估产模型。本发明用于农作物产量的预测。

摘要： 基于Extreme数学模型重构VI时间序列曲线的作物估产模型，属于农作物产量预测技术领域。本发明是为了解决现有作物估产中利用的遥感影像获取率低，导致因此建立的作物估产模型通用性差的问题。它首先采集待估产区作物整个生产期的遥感影像，并进行预处理；然后根据待估产区地块矢量图范围进行裁剪，获得裁剪图像中每个像元的植被指数VI时间序列曲线；再将VI时间序列曲线按照行为像元排序，获得裁剪图像的时期排序；采用数学模型Extreme对所有像元的植被指数VI时间序列曲线进行拟合；确定最优拟合VI，提取植被指数VI时间序列曲线的特征参数；最后获得估产模型。本发明用于农作物产量的预测。