تاثیر تابش های هسته ای بر طیف های nmr و gc - ms مواد آلی

امکان سنجی استفاده از ترکیب سه تایی( ZnxHg(1-x)Te به عنوان طیف نمای تابش های هسته ای

In this paper in order to achieve a suitable spectrometer for nuclear radiation detection at room temperature, effect of adding the element Hg to binary compound semiconductor ZnTe was studied completely. Electronic structure and transport properties of ternary compound semiconductor ZnxHg(1-x)Te (ZHT) simulated using ABINIT as a computational code based on density functional theory. According ...

تجزیه و تحلیل طیف رزوناس مغناطیسی هسته ای ترکیبات آلی ( کوپلاژ بین اسپین هسته ها در رزونانس مغناطیسی هسته)

Classification of Coffee Beans by GC-C-IRMS, GC-MS, and 1H-NMR

In a previous work using (1)H-NMR we reported encouraging steps towards the construction of a robust expert system for the discrimination of coffees from Colombia versus nearby countries (Brazil and Peru), to assist the recent protected geographical indication granted to Colombian coffee in 2007. This system relies on fingerprints acquired on a 400 MHz magnet and is thus well suited for small s...

شناسایی ترکیب های شیمیایی مواد استخراجی چوب ساقه توتون (Nicotiana tabacum L. 'Coker 347') با روش کروماتوگرافی گازی - طیف سنجی جرمی(GC/MS)

توتون (Nicotianan tabacum) گیاهی صنعتی و یک ساله است که در شمال ایران برای تامین برگ آن جهت تولید تنباکو کاشت می شود و سالیانه مقادیر قابل ملاحظه ای ساقه توتون در شمال کشور تولید می شود. در این تحقیق ساقه توتون واریته کوکر347 به صورت کاملا تصادفی از منطقه گیلان، شهرستان آستارا تهیه گردید و طبق آزمون های استاندارد TAPPI ابتدا آرد چوب تهیه و سپس درصد مواد استخراجی آن تعیین گردید. نتایج این تحقیق ...

Chemical Analysis of Pesticides Using GC/MS, GC/MS/MS, and LC/MS/MS

There are well over 500 registered pesticides worldwide for use in agricultural regions and new agrochemicals are introduced to the marketplace continuously. This chapter deals with the chemical analysis methods for the main pesticide chemical classes that are most frequently analyzed with gas chromatography (GC) or liquid chromatography (LC) coupled to mass spectrometry (MS). GC amenable pesti...

Agilent Metabolomics Workflow Solutions Using LC/MS, GC/MS, and NMR

Agilent Technologies is an established leader in providing metabolomics solutions. Metabolomics refers to the identification and quantitation of metabolites, which are the small organic molecules that are used in biological processes within cells. These molecules are important indicators of biological function, and their study can provide unique insights into cell physiology, metabolism, and to...