HC HSQC


Dissipation factor (10 Hz) High  [c.1036]

GPF = general purpose furnace SRF = semireinforcing furnace MT = medium thermal HS = high structure LS = low structure LM = low modulus. Dibutyl phthalate [84-74-2] absorption.  [c.550]

Refers to coordination number 4. Is = low spin, hs = high spin.  [c.1074]

Mercury/mercurous sulphate (Hg/HgSOj, SOJ ) Silver/silver chloride (Ag/AgCl, Cl )  [c.1321]

Hg Mercury, high alumina cement  [c.204]

Mercury(II) chloride, HgC, corrosive sublimate, m.p. 280 C, b.p. 302"C. Essentially covalent material (Hg plus CL Hg plus aqua regia). Forms complex halide ions, e.g. (HgCU) (HgCL)" in excess HCl and forms complexes. Very poisonous.  [c.254]

By-products of these processes of hydrotreating are gases, H2S, and some naphtha. The hydrogen consumption is relatively high as a function of the required performance.  [c.402]

Some natural gases contain high H2S contents above 30% in some Canadian producing wells, where the sulphur is recovered from the product stream and is sold commercially.  [c.94]

High frequency Eddy current probing-. This apphcation covers an excitation frequency range from some 100 Hz to about 1 MHz, where the induced signal exceeds the noise of a ohmic antenna. As shown in fig. 1 a conventional normal conducting Eddy current probe is used for field generation and sampling. The signal current of the pick up coil is coupled inductively into the SQUID inductance. This results in an input magnetic flux, that is converted into a voltage by the SQUID.  [c.298]

HIGH ENERGY VERSION TH 94402 HX  [c.596]

With appropriate caUbration the complex characteristic impedance at each resonance frequency can be calculated and related to the complex shear modulus, G, of the solution. Extrapolations to 2ero concentration yield the intrinsic storage and loss moduH [G ] and [G"], respectively, which are molecular properties. In the viscosity range of 0.5-50 mPa-s, the instmment provides valuable experimental data on dilute solutions of random coil (291), branched (292), and rod-like (293) polymers. The upper limit for shearing frequency for the MLR is 800 H2. High frequency (20 to 500 K H2) viscoelastic properties can be measured with another instmment, the high frequency torsional rod apparatus (HFTRA) (294).  [c.201]

Acrylamide—polymer/Ct(III)catboxylate gel technology has been developed and field tested in Wyoming s Big Horn Basin (211,212). These gels economically enhance oil recovery from wells that suffer fracture conformance problems. The Cr(III) gel technology was successful in both sandstone and carbonate formations, and was insensitive to H2S, high saline, and hard waters (212).  [c.147]

Half-cells based on Ag-AgCl, Hg-HgO, Hg-HgSQj and other system.s can be used as reference electrodes (see Table 3-1) 14]. Electrodes have been developed to operate up to 100 bar and 250°C (see Fig. 21-8).  [c.477]

HC HMQC (heteronuclear multiple quantum coherence) and HC HSQC (heteronuclear single quantum coherence) are the acronyms of the pulse sequences used for inverse carbon-proton shift correlations. These sensitive inverse experiments detect one-bond carbon-proton connectivities within some minutes instead of some hours as required for CH COSY as demonstrated by an HC HSQC experiment with a-pinene in Fig. 2.15.  [c.36]

Figure 2.15. HC HSQC experiment (contour plot) of a-pinene [ CDCI3, 5 % v/v, 25 °C, 125 MHz for C, 500 MHz for h, 4 scans, 256 experiments]. This experiment gives the same information as Fig. 2.14 within 8 minutes instead of two hours required for the CH-COSY in Fig. 2.14 due to higher sensitivity because of proton detection and stronger magnetic field. Deviations of proton shifts from those in Fig. 2.14 arise from the change of the solvent. The methylene protons collapsing in Fig. 2.14 at Sh = 2.19 (200 MHz) display in this experiment an AB system with = 2.17 and Sg = 2.21 (500 MHz) Figure 2.15. HC HSQC experiment (contour plot) of a-pinene [ CDCI3, 5 % v/v, 25 °C, 125 MHz for C, 500 MHz for h, 4 scans, 256 experiments]. This experiment gives the same information as Fig. 2.14 within 8 minutes instead of two hours required for the CH-COSY in Fig. 2.14 due to higher sensitivity because of proton detection and stronger magnetic field. Deviations of proton shifts from those in Fig. 2.14 arise from the change of the solvent. The methylene protons collapsing in Fig. 2.14 at Sh = 2.19 (200 MHz) display in this experiment an AB system with = 2.17 and Sg = 2.21 (500 MHz)
Conditions CDCI3, 25 °C, 500 MHz (H), 125 MHz ( C). (a) //NMR spectrum and HH COSY plot of ethyl groups (b) HC HSQC plot with inserted zoomed section of ethyl groups  [c.121]

Carbon atoms and protons are assigned by means of the proton-carbon connectivities as identified in the HC HSQC and HMBC experiment (b and c). The latter also permits the derivation of the connection of the ethyl groups to the porphyrin ring. The cross signals in the relevant part a of the HH COSY plot (a) are used to connect the methyl and methylene subunits to the ethyl groups.  [c.213]

Additionally, all carbon-proton bonds can be assigned by means of the HC HSQC experiment b  [c.226]

For each molecule (isomer A and isomer B), obtain dihedral angles for the following pairs of vicinal hydrogens Hg-Hy, H Hg, Hy-Hn, and Hg-Hyaxiai- Use the Karplus equation to estimate coupling constants for each pair, and then compare your predictions to the experimental coupling constants (see above). Which molecule is artemisin acetate and which is 6-epiartemisin acetate  [c.263]

AS—Air Supply BD—Blowdown BF—Blind Flange CBD—Continuous Blowdown CD—Closed Drain CH-O—Chain Operated CSO—Car Seal Open CSC—Car Seal Closed DC—Drain Connection EBD—Emerg. Blowdown Valve ESD—Emerg. Shutdown FC—Fail Closed FO—Fail Open HC—Hose Connection IBD—Intermittent Blowdown LO—Lock Open ML—Manual Loading NC—Normally Closed NO—Normally Open OD—Open Drain  [c.25]

Mercury T) sulphate. HgjSO formed by precipitation or excess Hg plus H2SO4. Hydrolysed to basic salts.  [c.255]

Titanium JII) oxide, Ti203. Violet, formed by reducing TiOj with H2 at high temperatures.  [c.400]

Gases which are high in FIjS are subject to a de-sulphurisation process in which H2S is converted into elemental sulphur or a metal sulphide. There are a number of processes based on absorption in contactors, adsorption (to a surface) in molecular sieves or chemical reaction (e.g. with zinc oxide).  [c.254]

For precise 3D-FEM simulations, a huge number of nodes is required (>30,000), which results in calculation times of several hours (sun spare 20) for one model. In order to decrease the number of nodes, we took advantage of the symmetry of the coils and calculated only a quarter or half of the test object. The modelled crack has a lenght of 15 mm, a height of 3 mm and is in a depth of 5 mm. The excitation frequency was 200 Hz.  [c.259]

The threshold density of electrons was taken equal to 10 cm A visible image in GDC is formed by visible radiation of excited atoms of an inert gas or by a visible glow of a luminescent layer. This glowing is induced by UV radiation of gas discharges. The yield of visible radiation of discharges in GDC Xe is of two orders lower, compared with UV radiation and image brightness does not exceed 10 cd/m (for frequency 25 Hz), which is not enough for proper visualization of images and difficult for recording. The source of UV radiation are excimeric molecules of an inert gas, resulting from triple collissions with participation of resonant-excited atoms. The excimer radiation propagates out of a gas discharge volume to a luminescent layer by a radiative way, increasing unsharpness of images on this layer. High intensity of UV radiation is sufficient for nonlinear luminescence of layers and decreases unsharpness of images - by 1,5 times on the layers (5-10) mcm thick, that operate for luminous transmission, that compensates image blurring, related to radiative propagation of UV radiation. The image of good quality can be obtained when recording a charge pattern with a GDC anode (with spatial resolution 3-4 lines/mm).  [c.539]

The X-rays hit, lessened by the samples, the incoming screen of the image intensifier. The image intensifier changes the X-rays to visible light. The visible radiogram is taken by an optieal system to a high speed camera. The reeording and analysis of the motion of the particles is mastered by a high speed eamera system and the included analysing software, manufaetured by Mikromak, Erlangen. During the examinations reeording frequeneies from 750 to 1000 Hz were reaehed. The system is able to guaranteed a sufficient expose time at a loss minimum of the process dynamics. The high speed camera data are supplied to a computer-controlled recording system and stored digitally.  [c.545]

If the heating is quickly to a high temperature, or a flashing, all adsorbed gas is removed indiscriminately. If, however, the heating is gradual, then separate, successive desorptions may be observed. Thus, as illustrated in Fig. XVIII-9, hydrogen leaves flat, stepped, and kinked Pt surfaces in stages, indicating the presence of different adsorption sites. The presences of successive desorption stages is fairly common. No less than four are found for H2 chemisorbed on Pd(llO), as shown in Fig. XVIII-10 notice how successive maxima appear with increasing exposure. Xu and Koel [87a] report three different states for NO desorption from Pt(III), possibly due to different bonding geometries (as in Fig. XVlII-5). Yates [88] has reviewed the subject.  [c.696]


See pages that mention the term HC HSQC : [c.1036]    [c.372]    [c.139]    [c.214]    [c.171]    [c.294]    [c.201]    [c.40]    [c.41]    [c.776]    [c.1276]    [c.72]    [c.111]    [c.78]    [c.141]    [c.20]    [c.77]    [c.81]    [c.254]    [c.254]    [c.348]    [c.84]    [c.184]   
Structure Elucidation by NMR in Organic Chemistry (2002) -- [ c.36 ]