<kbd id="3csweafe"></kbd><address id="sqctsjr1"><style id="w7vofzgn"></style></address><button id="z7j88bc5"></button>

          跳到内容
          临近预报 在上午04时30分工作日上午KCCI新闻
          快到了
          广告

          沙巴体育官网的研究人员找到突破的方法来打击犯罪

          沙巴体育官网的研究人员找到突破的方法来打击犯罪
          隐藏成绩单 秀成绩单
          STACEY: THIS IS FASCINATING. A SCIENTIFIC BREAKTHROUGH AT IOWA STATE UNIVERSITY HAS FOUND A NEW WAY TO USE FINGER PRINTS TO FIGHT CRIME. STEVE: AS KCCI SENIOR REPORTER TODD MAGEL SHOWS US, THEY HAVE FIGURED OUT HOW TO MEASURE THE AGE OF FINGERPRINTS AND WHEN A PERSON WAS AT THE SCENE OF A CRIME. >> WE ARE IN THE BASEMENT OF AN IOWA STATE UNIVERSITY CHEMISTRY BUILDING, WHERE STUDENTS AND THEIR PROFESSOR ARE USING THIS HIGH-TECH GEAR TO CHANGE THE WAY FINGERPRINTS ARE USED IN CRIME SCENE INVESTIGATIONS. >> I’M GOING TO DUST IT WITH THE BLACK CARBON POWDER YOU MAY HAVE SEEN ON TV SHOWS. REPORTER: ISU CHEMISTRY GRADUATE PAIGE HINNERS IS HELPING TO INVENT A BREAKTHROUGH. FOR YEARS SHE’S STUDIED HOW TO MEASURE HOW LONG A FINGER PRINT HAS BEEN DEPOSITED IN A CERTAIN SPOT. AND NOW WITH THE HELP OF ISU CHEMISTRY PROFESSOR YOUNG-JIN LEE THEY KNOW THE ANSWER. >> IT IS A BREAKTHROUGH. >> WE WERE DEFINITELY SHOCKED. >> WE CAN TELL HOW OLD IS THE FINGERPRINT WITHIN A FEW DAYS. REPORTER: LEE AND HINNERS DISCOVERED A WAY TO MEASURE CHEMICAL COMPOUNDS IN FINGER PRINTS. THEY FEED THE PRINT INTO A MASS SPECTROMETER. AND THEY BREAK IT APART WITH LASER BEAM. >> TYPICALLY ABOUT A QUARTER OF THE FINGER PRINT IS THE SIZE WE ANALYZE. REPORTER: THE SPECTROMETER CAN DETECT MICROSCOPIC LEVELS OF TRIGLYCERIDES, OR FAT LEFT IN A FINGER PRINT. FRESH PRINTS HAVE 更多 FAT. THE FAT BEGINS TO FADE IN OLDER PRINTS. A FORMULA ALLOWS THEM TO DETERMINE HOW OLD A FINGER PRINT IS BY MEASURING THE MASS OR INTENSITY OF THAT FAT. >> YOU CAN SAY NOT ONLY WAS IT THIS PERSON, THIS PERSON WAS AT THE CRIME SCENE DURING THIS TIME, OR THIS PERSON WAS PRESENT DURING THIS TIME. >> IT CAN CHANGE THE LIVES OF SO MANY PEOPLE WHO ARE KEPT IN PRISON TO ARE INNOCENT. REPORTER: IT’S TAKE ISU 3 YEARS TO COME UP WITH FINGERPRINT DEVELOPMENT, IT MAKE TAKE ANOTHER TWO YEARS BEFORE IT CAN BE USED IN A CRIMINAL TRIAL.
          广告
          沙巴体育官网的研究人员找到突破的方法来打击犯罪
          沙巴体育官网的研究小组已经发现使用指纹来打击犯罪的新途径后所作出的科学突破。该小组发现了如何来衡量指纹的年龄,什么时候人是在犯罪现场。佩奇Hinners ISU研究生化学帮助发明了突破。多年来,她学习如何衡量一个指纹过了多久,存放在某去过的地方。现在,随着ISU化学系教授李·扬·吉的帮助下,他们知道答案。 “我们肯定感到震惊,” Hinners说。 “我们可以告诉多大是指纹短短几天,”李说。李和Hinners发现了一种方法来测量指纹的化学化合物。他们输送打印到质谱仪,他们掰开它用激光束。 “通常,关于指纹的四分之一是我们分析的大小,” Hinners说。该光谱仪可检测甘油三酯的微观层面,或脂肪留在指纹。有更多的脂肪,新鲜的照片。肥开始褪色为prents变老。以确定如何调查允许使用指纹老A式是通过测量即脂肪的质量或强度。 “你可以说,它不仅是这个人,这个人是在犯罪现场在这段时间里,或者这个人存在在这个时候,” Hinner说。它采取了三年前来ISU了指纹的发展,它可能需要两年,才可以在刑事审判中使用。

          沙巴体育官网的研究小组已经发现使用指纹来打击犯罪的新途径后所作出的科学突破。

          该小组发现了如何来衡量指纹的年龄,什么时候人是在犯罪现场。

          广告

          佩奇Hinners ISU研究生化学帮助发明了突破。多年来,她学习如何衡量一个指纹过了多久,存放在某去过的地方。现在,随着ISU化学系教授李·扬·吉的帮助下,他们知道答案。

          “我们肯定感到震惊,” Hinners说。

          “我们可以告诉多大是指纹短短几天,”李说。

          李和Hinners发现了一种方法来测量指纹的化学化合物。他们输送打印到质谱仪,他们掰开它用激光束。

          “通常,关于指纹的四分之一是我们分析的大小,” Hinners说。

          该光谱仪可检测甘油三酯的微观层面,或脂肪留在指纹。有更多的脂肪,新鲜的照片。肥开始褪色为prents变老。以确定如何调查允许使用指纹老A式是通过测量即脂肪的质量或强度。

          “你可以说,它不仅是这个人,这个人是在犯罪现场在这段时间里,或者这个人存在在这个时候,” Hinner说。

          它采取了三年前来ISU了指纹的发展,它可能需要两年,才可以在刑事审判中使用。

              <kbd id="c59k0sme"></kbd><address id="6cf0ck3k"><style id="64i7h8i0"></style></address><button id="a6ii280i"></button>