氧气呼吸器校验仪的研制及应用

本文介绍了一种多功能氧气呼吸器校验仪,采用真空泵供气,配置了一套压力调整器组件,能够测试呼吸器高中压系统性能,并在试验室进行了测试应用,结果表明:该校验仪能够测试氧气呼吸器整体性能指标,功能齐全,操作简单,为救护队员快速测试呼吸器性能提供了有力支持。     

数字

正200亿元奥维咨询发布的数据显示,2013年空气净化器的市场规模为120亿元左右,预计2014年将超过200亿元,而到2020年有望超过1500亿元。目前,空气净化器是继净水器之后的又一直销家居热点产品。17000名目前,安利正准备进入保加利亚市场,并采取直销模式经营。安利计划,到2014年底在保加利亚培养超过17000名直销商。     

An observational study of snow aging and the seasonal variation of snow albedo by using data from Col de Porte,France

An 18-year long （1993-2011） comprehensive dataset of snow and meteorological variables from Col de Porte, France is used to analyze the variation of shortwave broadband albedo with elapsed time after snowfalls （snow aging） during each snow season. The effects of air temperature, snow surface temperature and snow depth on snow albedo are investigated. An index based on the accumulation of air temperature over several consecutive days with daily mean higher than 2.5 ℃ is proposed to divide each snow-covered period into a dry and the following wet snow season when this index reaches 18 ℃. The results indicate that snow surface albedo decreases exponentially with time in both dry and wet snow seasons. Snow albedo reduction with snow aging is small at low surface temperature and the reduction rate increases with the rise of surface temperature. However, the reduction rate is widely scattered within the observed range of temperature, implying a loose relationship between snow albedo and snow surface temperature. Snow albedo in wet snow season is generally smaller and decreases faster than in dry snow season. For Col de Porte site, snow depths to effectively mask the underlying surface are 21 and 33 cm in dry and wet snow season respectively.     

隐形空气椅：可穿着走路蹲下变椅子

对于懒人来说，能躺就不坐，能坐就不站，如果没有椅子就干脆自己带一张。一家科技公司研发了一款可以“穿着走”的椅子．它就像长在体外的骨头，只要做出坐的姿势．就可以马上变成一张椅子。网友看到这项产品纷纷发出赞叹，有人戏称以后就算军训课被罚蹲马步也不用怕了。     

Analysis of condenser venting rates based on the air mass entransy increases

Condenser thermal performances, such as the back pressure and venting rate, are strongly affected by the tube arrangement. Condensers have three irreversible pro- cesses for the fluid flow, heat transfer and mass diffusion. The condenser venting rate is studied here based on an air mass entransy analysis. The air mass entransy increment rate for the steam and air mixture on the condenser shell side is expressed as a function of the distributed air mass fraction and the steam condensation rate to define the relationship between the condenser venting rate and the flow parameters. Condensers with three typical tube arrangements were analyzed numerically using the porous medium model. The results show that a bigger venting rate always corresponds to a smaller air mass entransy incre- ment rate. The air mass entransy generally decreases in the air concentration region and increases in the air cooling region under the combined action of the air diffusion and steam condensation. The numerical results indicate that the air cooling region of a condenser should be carefully designed and the cooling tubes should be properly arranged to guide the steam flow so as to weaken air concentration, and consequently to decrease the venting rate.     

新动态

<正>除霾利器可减污40%专注于室外空气净化、类似于公交站的城市空气净化装置,将落户清华大学并将于下月开始在清华大学校园里进行测试。相关研究数据显示,该净化装置能平均减少空气污染物(PM2.5和PM10)实时浓度的40%。日本研发"智能"家具:厨房自动烧菜镜子当医生松下公司日前示范了能和主人对话的厨房、客厅及卧室。这些前卫家具都可连接互联网,还能辨认声音,只要人们开口说话,就能使     

光合作用

<正>公元前4世纪,古希腊哲学家亚里士多德认为,植物生长发育所需的物质完全来自土壤。1648年,比利时科学家海尔蒙特出于对亚里士多德观点的怀疑,做了柳树栽培实验,结论表明,植物的物质积累不是来自土壤,而是来自水。1779年,荷兰科学家英格豪斯通过实验证明,植物绿叶可以更新污浊的空气,并且要在阳光照射下才成功。1785年,随着空气组     

时尚新品

正只有Sony没有Ericsson产品名:Xperia S标签:索尼、智能手机1亮点:Xperia S采用无缝显示屏面板设计,屏幕大小为4.3寸,分辨率为1 080×720p。其内置1.5GHz双核处理器,以及一个1200万像素的ExmorR摄像头。支持NFC近距离无线通信和PlayStation游戏认证。Xperia S将会搭载Android 2.3上市。     

新业态:“筹客”来袭

"众筹"概念刚刚兴起,职业"筹客"已然来袭。在我国,"筹客"的概念还很新鲜,他们大多是众筹平台的忠实粉丝,投资项目,参与创业,与"创客"共同成长,并优先体验产品。不过,国内最大的众筹平台京东指出:"筹客"并不是一批单纯希望获得低价商品的消费者,可用五大标签来定义这个新群体:逼格、情怀、态度、梦想、探索精神。     

视野

正气泡去哪儿了?knowledge新知现在,让我们来开一瓶香槟酒吧!用力摇晃它,现在打开香槟通常会"嘭"地一下喷出无数气泡。但现在稍等一下,我们用手掌去拍打瓶身,直到手指头都觉得痛。再打开瓶子,我们会发现预想中的气泡灾难并没有发生。是不是觉得很神奇?科学家发现,所有的香槟酒与软木塞之间都有一层气体,里面含有二氧化碳,因此,当你摇动一瓶香槟酒时,