393 results about "Chemical shift" patented technology

A semiconductor light-emitting device member excellent in transparency, light resistance, and heat resistance and capable of sealing a semiconductor light-emitting device without causing cracks and peeling even after a long-time use is provided. Therefore, a semiconductor light-emitting device member that comprises (1) in a solid Si-nuclear magnetic resonance spectrum, at least one peak selected from a group consisting of (i) peaks whose peak top position is in an area of a chemical shift of −40 ppm to 0 ppm inclusive, and whose full width at half maximum is 0.3 ppm to 3.0 ppm inclusive, and (ii) peaks whose peak top position is in an area of the chemical shift of −80 ppm or more and less than −40 ppm, and whose full width at half maximum is 0.3 ppm to 5.0 ppm inclusive, wherein (2) silicon content is 20 weight % or more and (3) silanol content is 0.1 weight % to 10 weight % inclusive is used.

A polypropylene type aqueous dispersion comprising the following components (a) to (c):

wherein the component (a) has a main chain having the following features (1) and (2) and dispersion particles in the dispersion have an average particle size of at most 0.5 μm,

Feature (1) when observing a peak derived from a carbon atom of a methyl group in a propylene unit chain part comprising a head-to-tail bond by ¹³C-NMR and fixing a chemical shift of a peak top at a peak attributable to pentad expressed by mmmm to 21.8 ppm, a ratio (S₁/S) of an area S₁ of a peak of a peak top at 21.8 ppm to a total area S of peaks at from 19.8 ppm to 22.1 ppm is at least 10% and at most 60%, and when an area of a peak (mmmr) of a peak top at 21.5 to 21.6 ppm is expressed as S₂, 4+2S₁/S₂>5, and Feature (2) a content ratio (mol ratio) of propylene unit (A): other olefin unit (B) is from 100:0 to 90:10.

A two-dimensional (2D) chemical shift correlated MR spectroscopic (COSY) sequence integrated into a new volume localization technique (90°-180°-90°) for whole body MR Spectroscopy. Using the product operator formalism, a theoretical calculation of the volume localization as well as the coherence transfer efficiencies in 2D MRS is presented. A combination of different MRI transmit/receive rf coils is used. The cross peak intensities excited by the proposed 2D sequence are asymmetric with respect to the diagonal peaks. Localized COSY spectra of cerebral frontal and occipital gray/white matter regions in fifteen healthy controls are presented.

The invention provides hydrophobic surface-treated silica particles having (1) a ratio T2:T3 of about 0.4 or more, wherein T2 is the intensity of a peak having a chemical shift in the CP/MAS ²⁹Si NMR spectrum centered within the range of −56 ppm to −59 ppm, and wherein T3 is the intensity of a peak having a chemical shift in the CP/MAS ²⁹Si NMR spectrum centered within the range of −65 ppm to −69 ppm, and (2) a ratio (T2+T3)/(T2+T3+M) of greater than about 0.05, wherein M is the intensity of a peak having a chemical shift in the CP/MAS ²⁹Si NMR spectrum centered within the range of +7 ppm to +18 ppm. The invention also provides a method of preparing hydrophobic surface-treated silica particles.

The invention discloses a catalytic cracking catalyst and a preparation method thereof, the catalytic cracking catalyst includes (a)15%-65% of a natural mineral, (b) 10%-30% of an oxide and (c) 25%-75% of a mixture of a MFI structure molecular sieve and a phosphorus-modified beta molecular sieve; the phosphorus-modified beta molecular sieve comprises 3-10 wt% by P2O5 of phosphorus, and in the 27Al MAS NMR (Magic Angle Spinning Nuclear Magnetic Resonance) of the molecular sieve, the ratio of resonance signal peak area at the chemical shift of 40+-3ppm to resonance signal peak area at the chemical shift of 54+-3ppm is greater than or equal to 1. The preparation method of the catalyst comprises the steps of mixing and pulping of the phosphorus-modified beta molecular sieve, the natural mineral and a non-polar oxide adhesive, and spray drying, and the preparation method of the phosphorus-modified beta molecular sieve is as follows: programmed heating of beta molecular sieve raw powder to bake to remove a template agent, and then phosphorus modification. The catalytic cracking catalyst is applied to preparation of propylene by catalytic cracking of naphtha, and the low-carbon olefin production rate is higher.

Silica with a large pore volume, a large specific surface area, a narrow pore distribution, low contents of unwanted metal impurities, and excellent physical properties such as high heat-resistance and water-resistance is provided. The silica has a mode pore diameter (D_max) of 20 nm or less, and a solid-state Si nuclear magnetic resonance (hereinafter called solid-state Si NMR) spectrum of the silica includes a chemical shift (δ ppm) of Q⁴ peak meeting the following inequality (I).

−0.0705×(D_max)−110.36>δ  (I)

The silica with such properties can be suitably used in fields of which particularly excellent heat resistance and water resistance are required, and moreover controlled pore properties, and the fact that physical properties scarcely change over a long period of time are required among the above-mentioned applications.

This invention discloses crack catalyst to decrease olefin content in catalytic cracking gasoline, which is characterized in that there is 10~50 w.t% CDY molecular sieve in the catalyst that is prepared by exchanging method of solid-liquid combination; the rare earth content is 12~22 w.t% considering the quantity of rare earth oxide; all rare earth ion is in molecular sieve small cage; there is no peak at 0ppm in 27Al M AS NMR spectrogram. The catalyst can decrease olefin content in catalytic cracking gasoline greatly with well heavy oil conversion ability.

A method for magnetic resonance imaging (MRI) is provided. A magnetic resonance excitation is provided. A plurality of k-space echoes is acquired bi-directionally wherein at least one echo is an even echo acquired in a first direction and at least one echo is an odd echo acquired in a second direction opposite from the first direction. K-space echo realignment is corrected between the even and odd echoes. Field inhomogeneity induced artifacts are corrected. Chemical shift induced artifacts between at least two species are corrected.

The present invention relates to a method of performing dynamic contrast enhanced magnetic resonance imaging of an object (10) with signal separation for water and fat, the method comprising acquiring magnetic resonance datasets in the k-space using Dixon acquisition in a chemical shift encoding space and dynamic time resolution in a dynamic time space, wherein the dataset acquisition is performed employing undersampling, wherein the method further comprises: applying a compressed sensing reconstruction technique in the k-space, the chemical shift encoding space and the dynamic time space, said compressed sensing reconstruction resulting in reconstructed datasets, —performing Dixon reconstruction on the reconstructed datasets and dynamic contrast analysis on the Dixon reconstructed datasets.

A silica-rich support and a catalyst containing the silica-rich support and a catalytic component. The support has a specific structure characterized by a set of claimed physicochemical properties: in the ²⁹Si MAS NMR spectrum the state of silicon is characterized by the presence of lines with chemical shifts −100±3 ppm (line Q³) and −110±3 ppm (line Q⁴), with the ratio of the integral intensities of the lines Q³/Q⁴ of from 0.7 to 1.2 (FIG. 1); in the IR spectrum there is an absorption band of hydroxyl groups with the wave number 3620–3650 cm⁻¹ and half-width 65–75 cm⁻¹ (FIG. 2); the carrier has a specific surface area, as measured by the BET techniques from the thermal desorption of argon, S_AR=0.5–30 m²/g and the surface, as measured by alkali titration techniques, S_Na=10–250 m²/g, with S_Na/S_Ar=5–30.

In a nuclear magnetic resonance tomography apparatus and a method for the operation thereof, on the basis of the 3-point Dixon method, spin collectives having different chemical shifts are separated by means of information maximization despite great field inhomogeneities. The unwrapping of the phases is implemented over interconnected pixel regions (phase unwrapping) proceeds initially only in regions with high signal amplitude and the regions of lower amplitudes are only successively acquired by increments. These are then assigned to the respectively correct spin type, such as fat or water.

Systems and methods are described for chemical shift magnetic resonance imaging in the presence of multiple chemical species. A method includes obtaining a plurality of MRI data signals using a Dixon technique in combination with partially parallel imaging techniques and/or inversion recovery techniques, and processing the plurality of MRI data signals using a Dixon reconstruction technique to create a chemical specific shift image. An apparatus includes a MRI scanner for obtaining images, a controller configured to provide input to the scanner to acquire images using a Dixon technique in combination with partially parallel imaging techniques and/or inversion recovery techniques to produce a plurality of MRI data signals, and processing the plurality of MRI data signals using a Dixon reconstruction technique to create a chemical specific shift image, and an output device to display the resulting image.

A negative electrode active material including: a particle of negative electrode active material containing silicon-based material of SiO_x (0.5≦x≦1.6); wherein the intensity A of a peak in a Si-region given in the chemical shift region of from −50 to −95 ppm and the intensity B of a peak in a SiO₂-region given in the chemical shift region of from −96 to −150 ppm in a ²⁹Si-MAS-NMR spectrum of the silicon-based material satisfy a relationship that A/B≧0.8. This provides a negative electrode active material which can increase a battery capacity, and can improve cycle characteristics and initial charge/discharge characteristics when used as a negative electrode active material for a lithium ion secondary battery.

A polybenzimidazole-base complex includes a polybenzimidazole-based material and a base, wherein a peak corresponding to NH of an imidazole ring of the polybenzimidazole-based material does not appear at a chemical shift of 12 to 15 ppm in a ¹H nuclear magnetic resonance (¹H-NMR) spectrum of the polybenzimidazole-base complex. A crosslinked material may be formed as a polymerization product of a polybenzimidazole-base complex and a benzoxazine-based monomer. The crosslinked material may be used an electrolyte membrane for a fuel cell comprising the crosslinked material, and a fuel cell may include the electrolyte membrane.

A high energy focusing ultrasonic system based on permanent-magnet magnetic resonance imaging system is composed of a U-shaped 0.35T/0.45T permanent-magnet magnetic resonance imaging system consisting of permanent magnet, gradient coil, RF receiving emitting coil, and high-energy focusing ultrasonic emitter, and an examining bed (or chair) for patient. It can perform real-time tumor examination, therapy and temp control.

The invention discloses a cracking assistant for improving the low-carbon olefin concentration. The cracking assistant comprises a phosphorus and transition metal-containing beta molecular sieve, a first-clay-containing phosphorus aluminum inorganic binder, other inorganic binder and second clay; the first-clay-containing phosphorus aluminum inorganic binder comprises 15-40 wt% by Al2O3 of an aluminum component, 45-80 wt % by P2O5 of a phosphorus component and 1-40 wt % by dry basis of first clay, the weight ratio of P to Al is 1-6; the phosphorus and transition metal-containing beta molecular sieve comprises 1-10wt% by P2O5 of phosphorus and 0.5-10 wt % by metallic oxide of a metal; and in the 27Al MAS NMR (Magic Angle Spinning Nuclear Magnetic Resonance) of the phosphorus and transition metal-containing beta molecular sieve, the ratio of resonance signal peak area at the chemical shift of 40+-3ppm to resonance signal peak area at the chemical shift of 54+-3ppm is greater than 1, and the percentage of the sun of the resonance signal peak area at the chemical shift of 0+-3ppm and the resonance signal peak area at the chemical shift of-12+-3ppm to the total peak area is less than 10%. The cracking assistant is used for catalytic cracking, and can improve ethylene concentrations in a catalytic cracking dry gas, and improve propylene and isobutylene concentration in a liquefied gas.

The invention provides an all-silicon molecular sieve and a synthetic method thereof. Q4/Q3 of the all-silicon molecular sieve is (10-90):1, wherein Q4 is the peak intensity expressed by the peak height at the chemical shift of -112+/-2ppm in a 29SiNMR spectrogram of the all-silicon molecular sieve, and Q3 is the peak intensity expressed by the peak height at chemical shift of -103+/-2ppm in the 29SiNMR spectrogram of the all-silicon molecular sieve. The synthetic method of the all-silicon molecular sieve comprises the following steps: mixing a template agent, an organic silicon source, an inorganic ammonium source and water to be subjected to hydrolytic alcohol removal, aging the obtained product, mixing the aging product with a solid silicon source, crystallizing the mixture in a closed reaction kettle, and recovering the all-silicon molecular sieve. The all-silicon molecular sieve provided by the invention has higher activity in cyclohexanone-oxime beckmann rearrangement.