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Nuclear magnetic resonance

Xem 1-20 trên 50 kết quả Nuclear magnetic resonance
  • Lecture Organic chemistry - Chapter 10: Nuclear magnetic resonance (NMR) spectroscopy. In this chapter, the following content will be discussed: What is spectroscopy? General spectrometer, the chemical shift δ, complex splitting patterns,...and other contents.

    ppt0p thiendiadaodien_3 27-12-2018 7 0   Download

  • NMR is an experiment in which the resonance frequencies of nuclear magnetic systems are investigated. NMR always employs some form of magnetic field (usually a strong externally applied field B0) NMR is a form of both absorption and emission spectroscopy, in which resonant radiation is absorbed by an ensemble of nuclei in a sample, a process causing detectable emissions via a magnetically induced electromotive force.

    pdf20p qdung92ct 03-07-2012 72 10   Download

  • Since its first implementation by Lauterbur [1], Magnetic Resonance Imaging (MRI) has become an important noninvasive imaging modality. MRI has found a number of applications in the fields of biology, engineering, and material science. Because it provides unique contrast between soft tissues (which is generally superior to that of CT) and high spatial resolution, MRI has revolutionized diagnostic imaging in medical science. An important advantage of diagnostic MRI as compared to CT is that the former does not use ionizing radiation....

    pdf197p waduroi 03-11-2012 57 16   Download

  •  NMR in solids, like solution-state, relies on the behavior of nuclear spin energy levels in a magnetic field. However, the interactions that affect NMR spectra act differently.  In liquids, molecules reorient and diffuse quickly, leading to narrow isotropic resonances.  In solids, the fixed orientation of individual crystallites leads to a range of resonance frequencies for anisotropic interactions.

    pdf14p qdung92ct 03-07-2012 55 4   Download

  • (bq) part 1 book "introduction to spectroscopy" has contents: molecular formulas and what can be learned from them, infrared spectroscopy, nuclear magnetic resonance spectroscopy, nuclear magnetic resonance spectroscopy,,...and other contents.

    pdf397p bautroibinhyen20 06-03-2017 21 6   Download

  • Acta Veterinaria Scandinavica Research Tuyển tập các báo cáo nghiên cứu về bệnh học thý y được đăng trên tạp chí Acta Veterinaria Scandinavica cung cấp cho các bạn kiến thức về bệnh thú y đề tài: Proton nuclear magnetic resonance spectroscopy based investigation on propylene glycol toxicosis in a Holstein cow...

    pdf9p coxanh_1 22-10-2011 31 4   Download

  • (bq) part 1 book "organic chemistry principles in context" has contents: from cellulose and starch to the principles of structure and stereochemistry, a survey of the experiments usually performed by chemists to understand the structures of organic molecules - mass spectrometers, infrared spectrometers and nuclear magnetic resonance spectrometers,...and other contents.

    pdf350p bautroibinhyen20 06-03-2017 19 4   Download

  • (bq) part 2 book "introduction to spectroscopy" has contents: ultraviolet spectroscopy, mass spectrometry, combined structure problems, nuclear magnetic resonance spectroscopy.

    pdf348p bautroibinhyen20 06-03-2017 22 4   Download

  • Chapter 13 - Nuclear magnetic resonance spectroscopy. In this chapter, students will be able to understand: Use the chemical shifts, splitting patterns, and integrations shown in a proton NMR spectrum to propose structures for possible compounds; use the number of peaks and their chemical shifts in a 13C NMR spectrum to determine the number of types of carbon atoms in the compound and what functional groups they might represent;...

    ppt71p tangtuy02 11-03-2016 27 2   Download

  • A new monomer of N-benzoyl dithieno[2,3- b:2’,3’-d]pyrrole (BDP), has been successfully prepared via copper-catalyzed amidation. Then, this monomer was brominated to form 2,6- dibromo-n-benzoyl dithieno[2,3-b:2’,3’- d]pyrrole (DiBDP) monomer. The structures of monomers were confirmed via the nuclear magnetic resonance (1HNMR) and Fourier transform infrared (FT-IR). BDP and DiBDP monomers will be used as monomers for Suzuki polycondensation reaction to synthesize the donor-acceptor (D-A) conjugated polymers.

    pdf9p ironman1234 06-06-2018 14 1   Download

  • The typical synthesis procedure for the monomer of N,N-diphenyl-4-vinylaniline was conducted and has been proved to be ineffective in the university laboratory conditions. The modified procedure was applied successfully using freshly formed Wittig reagent. The monomer was characterized by proton nuclear magnetic resonance (1H NMR) spectroscopy and confirmed the chemical structure with the correct peaks. The photoconductive polymer of poly((4- diphenylamino styrene)) could be obtained only by using the white crystal monomer.

    pdf10p tieuthi300610 29-03-2018 20 0   Download

  • In this study, the synthesis of a telechelic linker bearing both azide and thiol functional groups was described. The reaction conditions were investigated to optimize the reaction yield. The product was analyzed using thin layer chromatography (TLC) and proton nuclear magnetic resonance (1 H NMR).

    pdf8p cumeo3000 01-08-2018 14 0   Download

  • The resulting TE-NRs were characterized by nuclear magnetic resonance (NMR) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy and size exclusion chromatography (SEC). Epoxy group was found for PC, STR5L, RSS3, TSS8® and SMR20 and trans-1,4-isoprene unit from trans-1,4-isoprene units from cis-trans isomerization was found for TSS8® and SMR20 from the assignments of 1H-NMR signals.

    pdf5p giesumanh 04-11-2018 6 0   Download

  • The purpose of this study is to synthesize and characterize poly (ethylene glycol) methyl ether (mPEG) conjugated chitosan (CS), mPEG-CS, at different ratios of 5-Fluorouracil (5-FU) delivery (5-FU-loaded mPEG-CS). The chemical cross-linking of these polymers were prepared by using 4-Nitrophenyl chloroformate reagent. The obtained mPEG-CS was characterized by Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1H NMR) spectroscopy.

    pdf4p bautroibinhyen211 26-11-2018 5 0   Download

  • The growth of magnetic resonance imaging (MRI) as a tool for studying brain function, as opposed to its more traditional role as a tool for studying brain anatomy and pathology, has been quite remarkable over the past decade. This has been driven in large measure by an appreciation of the considerable potential for functional magnetic resonance imaging (fMRI) to increase our understanding of how the human brain works, both in the normal and diseased states.

    pdf405p echbuon 02-11-2012 44 12   Download

  • Writing and rewriting a text such as Medical Imaging Physics over several editions presents two challenges. The first is to keep the information fresh and relevant. This is a particular challenge in medical imaging, because the field is evolving so rapidly. The third edition of this text was published in 1992, just 10 short years ago. Yet in that text no mention was made of topics such as photodiode or direct conversion digital x-ray imagers; digital mammography; digital fluoroscopy; power Doppler ultrasound; functional magnetic resonance imaging; elastography; or helical CT scanning.

    pdf502p echbuon 02-11-2012 52 13   Download

  • (bq) part 2 book "a complete introduction to modern nmr spectroscopy" has contents: the study of dynamic processes by nmr; electron paramagnetic resonance spectroscopy and chemically induced dynamic nuclear polarization; double resonance techniques and complex pulse sequences, two-dimensional nuclear magnetic resonance, nmr studies of biological important molecules,...and other contents.

    pdf186p bautroibinhyen20 06-03-2017 22 6   Download

  • (bq) part 1 book "the esc textbook of cardiovascular medicine" presents the following contents: the morphology of the electrocardiogram, cardiac ultrasound, cardiovascular magnetic resonance, cardiovascular computerized tomography, nuclear cardiology, invasive imaging and haemodynamics, clinical pharmacology of cardiovascular drugs,...

    pdf533p thangnamvoiva4 01-07-2016 37 4   Download

  • Giới thiệu về lịch sử phát triển của chụp cắt lớp cộng hưởng từ hạt nhân: Chụp cắt lớp cộng hưởng từ (Magnetic Resonance Imaging-MRI) là một kỹ thuật tạo ảnh thường được sử dụng chủ yếu trong y học chẩn đoán để tạo ra các ảnh có chất lượng cao về cấu trúc bên trong cơ thể của con người.MRI dựa trên cơ sở nguyên lý cộng hưởng từ hạt nhân (Nuclear Magnetic Resonance-NMR),một kỹ thuật phân tích phổ sử dụng trong nghiên cứu khoa học...

    pdf12p xingau4 11-08-2011 260 114   Download

  • MRI - Hình cộng hưởng từ (MRI/ Magnetic reconance imaging): Hình cộng hưởng hạt nhân (NMRI/ Nuclear magnetic resonance imaging). Lịch sử MRI: 1940: Felix Block + Edward Furcell. 1971: Raymond Damadian. 1972: Hounsfield - CT.

    pdf20p vuilacongaiha 08-07-2010 244 112   Download


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