Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Analytical evaluation of the

The analytic evaluation of the density matrix requires the diagonalization of Hi, which can be easily performed for the two extreme cases, a>r( Qg. Indeed, in the case of a low rf-field, only off-diagonal terms related to the CT are retained in the H Hamiltonian (39), which thus behaves like a fictitious spin-1/2 operator, affecting only the CT coherences /1 io- These coherences are thus selectively excited with the nutation frequency ... [Pg.132]

A typical example for a reaction with substantial contraction of volume is the synthesis of methanol from syngas. Formally, 1 mol CO and 2 mol of H2 react to form 1 mol of methanol. This means that at high degrees of conversion, the contraction in volume can be a factor of three. This has dramatic implications for the pressure as the gas volume drops, the total pressure also drops. As a surplus, the analytical evaluation of the reaction is also complicated owing to the change in volume as a function of the degree of conversion. [Pg.410]

Since the spherical core- and valence-scattering factors in the multipole expansion are based on theoretical wave functions, expressions for the corresponding density functions are needed in the analytical evaluation of the integrals in Eqs. (8.35)... [Pg.177]

At this stage, the analytical evaluation of the excess chemical potential requires necessary assumptions, such as choosing an integration path. [Pg.44]

If any analytical evaluation of the progress of the reaction is wanted, then an aliquot can be diluted with 95% ethanol (or methanol) and titrated with 0.02 N methanolic NaOH with cresol red as the endpoint indicator. An alternate approach is to employ a titrimeter (Radiometer, microtitration assembly, Copenhagen), but it is important to realize that most phospholipases A2 adhere strongly to glass surfaces. Thus a vessel resistant to the solvents used in the reaction is mandatory, as is rigorous attention to cleaning the electrode after titration. The extent of the enzymatic reaction can be calculated using as a control a reaction mixture with no enzyme added. [Pg.79]

Equation (9.3) also permits analytical evaluation of the integrated average voidage e taken through the whole bed height, above the point of inflection z for the dilute region at the top, and below zx for the dense region at the bottom ... [Pg.316]

Equation (4.15) is obtained by analytic evaluation of the u integration over the kinetic energy terms in Eq. (4.13). [Pg.155]

Mix fsDNA solution and H33258 at a final concentration of 1 pM in 50mM PBS and pipet an aliquot (20 pL) of this mixture on the gold or carbon SPE surface. Measure immediately using linear sweep voltammetry (LSV) after an equilibration time of 10s, with a sample interval of lmV, and a scan rate of 0.1 V/s from 0 to IV (Fig. 5). Alternatively, cyclic voltammetry (CV) can be applied with a scan range between 0 and 1V at a sweep rate of 0.1 V/s. For differential pulse voltammetry (DPV) measurements, the potential is scanned from 0 to 0.90V with a step potential of 4mV, pulse amplitude of 50mV, and a pulse period of 0.20s at a scan rate of lOmV/s. The current height is recorded at the peak potential (-0.6V) for analytical evaluation of the measurements. All measurements should be carried out at room temperature. [Pg.107]

Applications of the GIAO approach at the SCF level are now relatively routine, but correlated calculations are more difficult because the most convenient implementations of this approach require the analytic evaluation of the second derivatives. Therefore, correlated studies using GIAO basis functions are effectively limited to levels of theory for which analytic second-derivative methods are available. Although the number of calculations thus far carried out on chemical shifts is far too small to give us a clear picture of basis set and correlation effeas, the initial results of GIAO-MBPT(2) calculations suggest that correlation is indeed important for these phenomena. In Table 31 are results from a few representative calculations of chemical shifts. [Pg.158]

The KS exchange-correlation potaitial Vxc also is a highly non-linear functional of e(r), so analytical evaluation of the matrix elements... [Pg.177]

The MNDO/d formalism for the two-electron integrals has several advantages Conceptually, it employs the same approach as the established MNDO-type methods [19-22], including an effective reduction of the Coulomb interactions to allow for dynamic electron correlation. Moreover, it is rotationally invariant and computationally efficient, and analytical first and second derivatives of the integrals are available [121]. An alternative formalism has been implemented more recently in the SAMI approach [23,122], which apparently involves the analytical evaluation of the two-electron integrals in an spd basis and subsequent scaling (details still unpublished). [Pg.723]

Case Study 3.2—Analytical Evaluation of the Corrosion Rate... [Pg.118]

A weakness of Newton s method is the analytical evaluation of the Jacobian matrix. In many practical situations this is somewhat inconvenient and often tedious. This can be overcome by using finite difference to approximate the partial derivative that is. [Pg.639]

The electronic contributions (P ) listed as BKPT follow firom the analytic evaluation of the nonrelativistic CASSCF energy derivatives. The NC value correspond to the numerical differentiation of the field dependent CASSCF eneigy... [Pg.139]

Where the test supphes data for an analytical evaluation of the package, measurements made during the test should be corrected for non-standard initial conditions of ambient temperature, insolation, internal heat load, pressure, etc. The effects of partial loading, i.e. less than full contents, on the package heat capacity and heat transfer should be assessed. [Pg.182]

Establishment of the technological network ensuring consumption needs of the final consumer commodities and goods, analytical evaluation of the network, optimization of the industrial structure giving certain scenarios of the constraints, and selection of the priority investment projects. [Pg.549]


See other pages where Analytical evaluation of the is mentioned: [Pg.175]    [Pg.40]    [Pg.70]    [Pg.72]    [Pg.63]    [Pg.177]    [Pg.413]    [Pg.243]    [Pg.528]    [Pg.260]    [Pg.804]    [Pg.805]    [Pg.806]    [Pg.189]    [Pg.24]    [Pg.95]    [Pg.804]    [Pg.806]    [Pg.175]    [Pg.30]    [Pg.36]    [Pg.209]    [Pg.195]    [Pg.743]    [Pg.746]    [Pg.203]    [Pg.1297]    [Pg.531]    [Pg.537]    [Pg.228]    [Pg.165]    [Pg.199]    [Pg.222]   


SEARCH



Analytical evaluation

Evaluation of the Analytical Procedure

The Analyte

© 2024 chempedia.info