
[核] 核磁共振
Application of Hadamard transform in nuclear magnetic resonance (NMR) imaging enhances the sensitivity of NMR imaging.
阿達瑪變換應用到核磁共振成象技術中,能提高成象技術的靈敏度。
The paper mainly discussed the applied effects of high resolution inversion of relaxation spectrum in nuclear magnetic resonance (NMR) logging data.
本文對核磁共振測井數據的高分辨率弛豫譜反演技術及實際應用效果進行了讨論。
NMR(Nuclear Magnetic Resonance) logging technology is mainly used for quickly and accurately analyzing physical parameters of core, cuttings and the sidewall core on drilling site.
核磁共振錄井技術主要用于在鑽井現場快速、準确地分析岩心、岩屑和井壁取心的物性參數。
Nuclear magnetic resonance(NMR) technique has been widely used in medicine and geology.
核磁共振技術在醫學、地質等方面都有廣泛的應用。
Introduced are the principle, methods of low field nuclear magnetic resonance(NMR) imaging technology and it′s application in rock petrophysics experiment.
主要介紹了低場核磁共振成像技術的原理、方法及在岩石物理實驗方面的應用。
Nuclear Magnetic Resonance Sounding method is the only geophysical new method of directly detecting underground water at present.
核磁共振測深方法是目前唯一直接探查地下水的地球物理新方法。
To obtain a constant gra***nt magnetic field outside unilateral nuclear magnetic resonance(NMR), optimal design method based on finite element method(FEM) and topology optimization is proposed.
為了在單邊核磁共振儀器外産生梯度恒定的磁場,提出利用基于拓撲優化和有限元法的優化設計方法。
Nuclear magnetic resonance (NMR) is a kind of exploration, research material microstructure and properties of high and new technology.
核磁共振是一種探索、研究物質微觀結構和性質的高新技術。
Nuclear magnetic resonance (NMR) technology is a powerful means of organic structure determination without destroying the samples.
核磁共振技術是有機物結構測定的有力手段,不破壞樣品,是一種無損檢測技術。
Objective:Medical Nuclear Magnetic Resonance Tomography (MNMRT) and Surface Nuclear Magnetic Resonance Detection of groundwater (SNMRD) are different areas of NMR technology applications.
前言:目的醫學核磁共振與地面核磁共振找水是核磁共振技術應用的不同領域。
These discoveries were established on basis of discoveries of phenomena of nuclear magnetism (NM) and nuclear magnetic resonance (NMR).
該項發現建築在核磁和核磁共振現象被發現的基礎之上。
The features of Surface Nuclear Magnetic Resonance(SNMR) signal for underground water and the sources and characters of the spike noise distortion are analyzed.
首先分析了地面核磁共振信號的特征和奇異噪聲的來源與特點,提出了相應的消除方法并進行了仿真研究。
We researched the effects of sucrose on the spin- spin relaxation property in dough using pulsed field gra***nt Nuclear Magnetic Resonance ( PFG- NMR) techniques.
利用脈沖梯度場核磁共振技術(PFG-NMR)研究蔗糖對面團自旋-自旋弛豫特性的影響。
The purity of TMH was confirmed by 13C-Nuclear Magnetic Resonance (NMR) spectroscopy.
用13C-核磁共振譜表征了三羟************的化學結構。
The new developments of Nuclear Magnetic Resonance Spectrometers and the major features of various companies'spectrometers are introduced.
本文介紹了核磁共振儀的最新進展和各國儀器主要技術特點。
SPS were analyzed and characterized with infrared spectrum (IR), mass spectrum (MS), and nuclear magnetic resonance (NMR).
對提純後的石油*********進行了紅外光譜、質譜、核磁共振分析和表征。
In surface nuclear magnetic resonance(NMR) sounding technique, electrical conductivity of the earth is simplified by a homogeneous conductive half space.
地面核磁共振測深中,導電性影響一般用等效導電半空間代替。
This phenomena is called NMR(nuclear magnetic resonance).
這種現象稱為核磁共振。
The induced voltage of surface nuclear magnetic resonance(NMR) based on conduction model is a nonlinear function of water content distribution.
導電模型的地面核磁共振感應電動勢是含水量的非線性函數。
This text introduce the theory of nuclear magnetic resonance and the design of a NMR system.
本文介紹了核磁共振的原理及小型核磁共振系統電路部分的設計。
In this article, the principle of DDS is reviewed at first, then its new application in low field nuclear magnetic resonance core analyzer is discussed in detail.
文章首先介紹了DDS的原理,然後就其在低場核磁共振岩心分析儀中的應用進行了詳細的讨論,對應用效果進行了總結。
The integration on mass spectrometry, nuclear magnetic resonance, and other modern analytical techniques, made up of the metabonomics technology platform, have accelerated the study on metabonomics.
質譜、核磁共振等現代分析技術作為代謝組學研究的技術平台,它們的整合運用加速了代謝組學的研究進程。
Comparison of various permeability equations in conventional logging and nuclear magnetic resonance logging indicates that there is an inter relationship among these equations.
對常規測井和核磁共振測井的滲透率公式進行了比較,發現各滲透率公式存在相互聯繫。
The results show that the nuclear magnetic resonance data are in agreement with IR data for their structure.
研究結果表明,核磁共振數據與紅外光譜數據在結構表征方面相吻合。
核磁共振(Nuclear Magnetic Resonance,NMR)是一種基于原子核磁性質的分析技術。其核心原理是:原子核在強磁場中會吸收特定頻率的電磁波,發生能級躍遷,這種現象稱為磁共振。通過檢測躍遷後釋放的電磁波信號,可解析物質的分子結構和動态行為。
核自旋與磁場作用
原子核因自旋産生磁矩,在外加磁場中會按特定方向排列。不同原子核(如¹H、¹³C)具有不同的磁旋比,決定其共振頻率差異。此現象由物理學家伊西多·拉比于1938年首次發現(來源:《自然》期刊)。
拉莫爾頻率與能量吸收
當施加與核磁矩進動頻率(拉莫爾頻率)匹配的射頻脈沖時,原子核吸收能量發生能級躍遷。此過程遵循量子力學原理,可用布洛赫方程描述(來源:國際純化學和應用化學聯合會術語庫)。
化學結構分析
通過¹H NMR和¹³C NMR譜圖,可确定有機分子中氫、碳原子的化學環境及連接方式。例如藥物研發中用于解析活性成分結構(來源:《分析化學學報》)。
醫學成像(MRI)
基于NMR原理的磁共振成像技術,利用人體内水分子中的氫核信號,生成高分辨率三維解剖圖像,廣泛應用于腫瘤診斷和神經系統疾病檢測(來源:美國國立衛生研究院技術報告)。
材料科學
固體NMR可分析高分子材料結晶度,液體NMR用于研究蛋白質折疊構象,這些數據對納米材料開發和生物大分子研究至關重要(來源:英國皇家化學會期刊)。
核磁共振(Nuclear Magnetic Resonance,NMR)是一種基于原子核在磁場中與電磁波相互作用的物理現象,廣泛應用于化學、醫學和材料科學等領域。以下是詳細解釋:
核磁共振的頻率(拉莫爾頻率)由磁場強度和原子核的旋磁比決定: $$ omega = gamma B_0 $$ 其中,$omega$為共振頻率,$gamma$為旋磁比,$B_0$為外加磁場強度。
核磁共振技術自1945年發現以來,已成為現代科學的重要工具,其衍生技術如MRI徹底改變了醫學成像領域。
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