70多项污染减排重点技术应用于重点行业

据国外媒体报道，目前科学家正在打造一种“化学鼻子”，这种鼻子可以嗅出不同类型癌症细胞，发现任何不正常的细胞。下一代的癌症诊断技术可能可以依赖这种新发明。     

Stability analyses of the mass abrasive projectile high-speed penetrating into concrete target. Part Ⅰ： Engineering model for the mass loss and nose-blunting of ogive-nosed projectiles

The mass loss and nose blunting of a projectile during high-speed deep penetration into concrete target may cause structural destruction and ballistic trajectory instability of the penetrator,obviously reducing the penetration efficiency of penetrator.Provided that the work of friction between projectile and target is totally transformed into the heat to melt penetrator material at its nose surface,an engineering model is established for the mass loss and nose-blunting of the ogive-nosed projectile.A dimensionless formula for the relative mass loss of projectile is obtained by introducing the dimensionless impact function I and geometry function N of the projectile.The critical value V c0of the initial striking velocity is formulated,and the mass loss of projectile tends to increase weakly nonlinearly with I/N when V0〉V c0,whilst the mass loss is proportional to the initial kinetic energy of projectile when V0     

量子鼻子

大多数科学家认为，分子的形状决定了它的气味，我们使用鼻子中的感受器黏着具有特定形状的分子而嗅到气味但是这种理论不能解释为什么形状非常不同的分子可以具有相同的气味，或不同质量的相似形状的分子具有非常不同的气味．     

细菌和雪

有时恰是在人们鼻子底下的事理解得却很不透彻。蒙大纳州立大学的DavidSand及其合作者观察了世界不同地点各种温度下雪的样本,并研究了生物起源的冰核（即帮助冰品形成的微生物）。尽管40年前人们就知道了这种冰核的存在,这一最新研究结果表明它们可能扮演着比以前设想的更重要的角色。     

最少需要几分钟

正我非常喜欢吃手抓饼,你看它刚刚煎好时那金黄松脆的样子,让人多有食欲,咬上一口真是满嘴生香啊!所以我几乎每天放学都吵着让妈妈给我在学校旁边的手抓饼店里买上一个解解馋。今天放学时,我又提出了这个要求,妈妈笑着点了点我的鼻子说:"馋猫,就知道你爱吃。今天妈妈在网上买了面饼,我们回家自己煎     

匹诺曹的长鼻子

正~~     

Colorimetric Artificial Nose for Identification of Breath Volatile Organic Compounds of Patients with Lung Cancer

A novel and highly sensitive colorimetric sensor array was developed for the detection and identification of breath volatile organic compounds（VOCs） of patients with lung cancer.Employing dimeric metalloporphyrins,metallosalphen complexes,and chemically responsive dyes as the sensing elements,the developed sensor array of artificial nose shows a unique pattern of colorific changes upon its exposure to eight less-reactive VOCs and their mixture gas at a concentration of 735 nmol/L within 3 min.Potential of quantitative analysis of VOCs samples was proved.A good linear relationship of 490-3675 nmol/L was obtained for benzene vapor with a detection limit of 49 nmol/L（S/N=3）.Data analysis was carried out by Hierarchical cluster analysis（HCA） and principal component analysis（PCA）.Each category of breath VOCs clusters together in the PCA score plot.No errors in classification by HCA were observed in 45 trials.Additionaly,the colorimetric sensor array showed good reproducibility under the cyclic sensing experiments.These results demonstrate that the developed colorimetric artificial nose system is an excellent sensing platform for the identification and quantitative analysis of breath VOCs of patients with lung cancer.