the case study of coatzacoalcos veracruz mexico

... petroleum contamination and of the substances from the decomposition of organic matter in the sludge The comparison between the values of sum of PAHs and values of sum of their toxic equivalent factors ... soils The data of the contents of POPs in the set of sewage sludge were processed for the assessment of their “background values” The 90% percentile was used after elimination of outlying values These ... Republic (Gergel, 1995) The problem of the liquidation or suitable use of extracted sediments of these amounts is evident In spit of the traditional use of the sediments as the fertilizers on agricultural...

Ngày tải lên: 28/06/2014, 08:20

... sensitivity of the mass analysis, the analytes should elute with a maximal proportion of organic solvent into the ion source On the other hand, the LC should lead to the separation of CEdGA,B ... value of each sample to the mean ratio of the unmodified pGL3 Control vector The results of the luciferase reporter gene assay with the CEdG-modified vector showed that the plasmid with the highest ... completeness of the digest The inability to digest the CEdG-modified DNA by restriction enzymes can be caused by a steric hindrance of DNA adducts and by the loss of the symmetry of the recognition...

Ngày tải lên: 30/03/2014, 04:20

... probe on the other side A small hole can be drilled on the other side of the cavity to allow the output of the modulated LASER to be coupled to the IMPATT chip via a piece of optical fiber The intensity ... it develops between the phase of π to 2π (Figure 4) The width of the drift region is so adjusted that the transit time of carriers is half the period of the ac cycle Thus the total phase lag ... because the number of e-h pairs created is proportional to the product of ionization rate of an individual carrier, which is highest at the instant of the peak field, and the number density of charge...

Ngày tải lên: 21/06/2014, 06:20

... T f is the duration of the impulse response of one filter of the filter bank Maximal throughput of the communication system can be estimated by multiplying its number of sub-bands and the pulse ... two arms Cp is the geometric capacitance of the structure The Rs, Ls, Cs branch of the circuit is called the "motional arm," which arises from mechanical vibrations of the crystal The series elements ... IF frequency The photograph of this experimental setup is shown in Fig The VSA software in PC will capture the data of the PA The captured data can then import to Matlab for further analysis...

Ngày tải lên: 21/06/2014, 06:20

... antenna The total pattern of the system is computed by the sum of secondary field and the primary field of the feed element For the majority of feeds like horn antennas, the primary pattern in the ... addition, the direction of the reflected ray and the point of intersection of the reflected ray with the aperture plane are obtained by use of geometrical optics These fields comprise the aperture ... The operating frequency of the antenna is 1.4 GHz Reflector aperture is 7.0m in height and 13.5m in width with a focal axis of 5.31m The profile of azimuth curve is parabola and the profile of...

Ngày tải lên: 21/06/2014, 06:20

... the self-resonance of the interdigital capacitors The frequency response of the right-handed region is not as good as the left-handed region The other drawback is the high insertion loss of the ... oscillation in the divider First, the proper value of IL should be set within the range of no oscillation The Nyquist diagram of Fig 14(a) shows the divider oscillates above 2.5mA of IL, and then, the tail ... Element values of 21st order Chebyshev prototype low-pass filters As shown in Fig 4, the lower the pass-band ripple, the smoother are the element values In the limiting case, the values of the central...

Ngày tải lên: 21/06/2014, 06:20

... detail, the center frequency of the BPF is set at the end of the band(18GHz or 20GHz here), which is called the cut-off frequency in the gain equalizer design, with the ripple level of 0.1dB and the ... minimising the overlap between the current and voltage waveforms In the other part of the period, the active device is turned off acting as an open circuit Therefore, the current is theoretically ... number 1) added to the descending one(number 2) Particularly with Fig 1, the equalizer shows the minimum loss at the high end of the band Depending on cases, the slope of the equalizer's amplitude...

Ngày tải lên: 21/06/2014, 06:20

... where θs is the angular size of the extended radio source In the case of the uniform source brightness distribution θs is the physical angular size of the source disk In the case of the Gaussian ... have the same maximum value of at the center of the aperture and the same minimum value at the edge of the aperture that is equal to the value of the aperture edge illumination taper B Knowing the ... on the value of the edge illumination taper, regardless of the type of the aperture illumination The numerical simulations of the circular antenna beamwidth using the expression (18) for the...

Ngày tải lên: 21/06/2014, 06:20

... the number of levels is, the higher the diffraction efficiency is, however, the higher the difficulty of manufacture becomes Therefore, the compromise between the diffraction efficiency and the ... radius of the BOE, which is represented by R , is the same as that of the input and output planes; n1 and n2 represent the refractive indices of the free space and the BOE, respectively; and z is the ... Suc are the areas of the vth and uth sample ring of the input and output planes, respectively; Evi is the incident field at the vth sample ring of the input plane, and Euc and Eud are the calculated...

Ngày tải lên: 21/06/2014, 06:20

... presents the measured results at the output of the SDR receiver using the logic analyzer, where the left graph shows the total power averaged over the excitation band of frequencies, while the right ... Introduction The oceans of the Earth work in concert with the atmosphere to control and regulate the environment Fed by the sun, the interaction of land, ocean, and atmosphere produces the phenomenon of ... Doppler analysis of the data allows estimating their along-track positions relative to the position of the altimeter It follows that the alongtrack dimension of the signal data and the cross-track...

Ngày tải lên: 21/06/2014, 06:20

... quite close to the ideal cases of the theoretical description of the atmospheric extinction processes and simply represent a rough fitting of the theory Many aspects predicted by the theory are neglected ... to the different nature of the algorithms In the case of moderate rain (Fig 10-a) the precipitating areas are quite similar over the southern Mediterranean Sea; over the northern sector GPROF ...  n   n  (3) The values of J on the left-hand side of this equation are the source terms They represent the known excitations The elements of the Y-matrix are functions of the analyzed problem...

Ngày tải lên: 21/06/2014, 06:20

... under non thermal conditions Therefore measurable thermal effects are not expected Dosimetry calculations Fig 10 SAR in the surface of the sphere (nervous ganglion) The mean value of SAR in the volume ... neurons that as the frequency of the applied MF, fM, was coincident with the main frequency, f0 of the Fourier spectrum of the spontaneous bioelectric activity voltage impulse, the neuron firing ... in the X-ray, U.V and  ranges of the EM spectrum) or appreciable thermal effects (see dosimetry data) In fact in the range of ELF, the heating effects are eventually due to the production of...

Ngày tải lên: 21/06/2014, 06:20

... collector area of 500 cm2, and the amount of rain per tip was 0.1 mm The time of the tips was recorded with an uncertainty of second The rain gauge is situated near the receivers of the radio systems ... close to each other The measured CD of attenuation due to rain only at 58 GHz is slightly over the calculated one in the region of 0.008% - 1% of the time of year The measured CD of attenuation ... excellently with the measured distribution in the region of 0.05% - 4% of the time of year For the percentages of time smaller than 0.05%, the scaled distribution from path C is slightly under the measured...

Ngày tải lên: 21/06/2014, 06:20

... coefficient of specific heat of body material, L- the scale of irregular warning up of the material in the given condition, probably having the size similar to the size of the grain on the surface of the ... pyramid, or the like, causes the gaseous products formed from the initiation of the explosive at the end of the cylinder opposite the hollow cavity to focus the energy of the detonation products The ... receive the analytical decision of a task as a first approximation at the assumption, that the process of formation of a jet follows the laws of the stationary expiration In [17] on the basis of the...

Ngày tải lên: 21/06/2014, 10:20

... to the change of VD (drain lag) is regarded as predominant for the cases of higher VDoff Fig.10 shows (a) electron density profiles and (b) NDD+ profiles in the off state for the two cases The ... way that the absorption band of the activated resonator would be then shifted far away from the operation frequency band of the filter The response of the filter will change: shift of the absorption ... irrespective of the used substrate or of their thickness As in the case of the electrical resistivity measurements, the width of the hysteresys curve is very small Fig Hysteresis cycle of reflectivity...

Ngày tải lên: 21/06/2014, 10:20

... probe on the other side A small hole can be drilled on the other side of the cavity to allow the output of the modulated LASER to be coupled to the IMPATT chip via a piece of optical fiber The intensity ... it develops between the phase of π to 2π (Figure 4) The width of the drift region is so adjusted that the transit time of carriers is half the period of the ac cycle Thus the total phase lag ... because the number of e-h pairs created is proportional to the product of ionization rate of an individual carrier, which is highest at the instant of the peak field, and the number density of charge...

Ngày tải lên: 21/06/2014, 10:20

... T f is the duration of the impulse response of one filter of the filter bank Maximal throughput of the communication system can be estimated by multiplying its number of sub-bands and the pulse ... two arms Cp is the geometric capacitance of the structure The Rs, Ls, Cs branch of the circuit is called the "motional arm," which arises from mechanical vibrations of the crystal The series elements ... IF frequency The photograph of this experimental setup is shown in Fig The VSA software in PC will capture the data of the PA The captured data can then import to Matlab for further analysis...

Ngày tải lên: 21/06/2014, 10:20

... antenna The total pattern of the system is computed by the sum of secondary field and the primary field of the feed element For the majority of feeds like horn antennas, the primary pattern in the ... addition, the direction of the reflected ray and the point of intersection of the reflected ray with the aperture plane are obtained by use of geometrical optics These fields comprise the aperture ... The operating frequency of the antenna is 1.4 GHz Reflector aperture is 7.0m in height and 13.5m in width with a focal axis of 5.31m The profile of azimuth curve is parabola and the profile of...

Ngày tải lên: 21/06/2014, 10:20

... from mechanisms such as the orientation of dipoles, the buildup of space charge etc in the presence of the electric field It must be emphasized that the magnitude and sing of the time-dependent polarization ... On the other hand in silicon nitride the DCT method revealed the presence of thermally activated mechanisms The decay was fitted using the stretched exponential law and the Arrhenius plot of ... tdiel are the thicknesses of the air and dielectric layers beneath the membrane Due to the importance of the surface roughness on the device performance there has been an intensive effort on the modeling...

Ngày tải lên: 21/06/2014, 10:20

... an explicit expression of the capacitor ratio (then named Ropt), which permits to design the value of the MIM capacitors of the varactors: (5) (6) The optimal value of the MIM capacitor is finally ... idea of the thermal flow through a material or a stack of materials from a hot spot to another observation point Therefore, Rth depends on the thermal conductivity of the materials and the final ... input impedance (the 100 Ω circle is drawn in the Smith Chart of the figure 19) The corresponding impedance matching ratio of 5:1 is in the range of interest of a wide range of applications,...

Ngày tải lên: 21/06/2014, 10:20