摘要:

The voltage-current characteristic curves of the hollow cathode and glow discharge light sources were compared under different experimental conditions involving the use of Ar and He as the carrier gas and of Al and graphite as the cathodic material. The dependence of line intensity on gas pressure was also studied. Results allowed to select the best operative parameters for each system examined. As a rule, the most promising features were shown by the hollow cathode lamp with Ar.

ISSN:0038-7010    

DOI:10.1080/00387017808067749

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

Recently pulses of the electromagnetic cosmic radiation of varies frequency ranges were detected by means of space flight equipment [1]. But so far the physical nature of the sources of these pulses are not well known. Since the generators of these pulses are at far distances obviously, the latters should have considerable power. But in this case we are forced to accepte that that the radiation is generated not only by the surface but also by the bulk mass of the distant object. It is also reasonable to propose that the objects are superdense ones [2]. In the Latter case the electromagnetic radiation cann't difused up to the surface of a superdense object from the centre and so no electromagnetic and acoustic processes can give radiation from the bulk mass of an object. On the contrary gravitational and neutrino radiation may be generated by the bulk mass of a massive object and at the surface of these objects these radiations tightly bounded to matter may be partly transformed into electromagnetic radiation [3]. And we can suppose that namely this very small part of the whole radiational energy is at time registrated at the earth and space laboratories. The mauy ask why all of the remaining purt of teh rediated energy has not been detected yet? There where made some attempts to performe neutrino astronony equipment out no solar neuttinos have been detected yet. As to the camical gravitational radiation it is pregently inveutigated only at low frequencles and no distinet conclucion about its occurence in been reached in the lilorature.

ISSN:0038-7010    

DOI:10.1080/00387017808067750

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

This study describes a method for determining lead and cadmium in freeze dried samples of normal human lung tissue. The samples were digested with redistilled HNO3in a Teflon 19lined steel bomb. Although background absorption was monitored, no corrections were necessary as any organic residue not initially digested is easily removed during the ash stage of the atomizer cycle. This method of sample preparation and analysis easily can be used to deal with other biological samples and could be readily extended to biopsy size samples.

ISSN:0038-7010    

DOI:10.1080/00387017808067751

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

1H,13C,19F and29Si NMR chemical shifts and coupling constants for Si-substituted silatranes, XSi(OCH2CH2)3N, and triethoxysilanes, XSi(OCH2CH3)3, where X = H, CH3, and F have been studied. Expansion of the coordination numbers of silicon and tin leads to similar changes in the NMR parameters.

ISSN:0038-7010    

DOI:10.1080/00387017808067752

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

The chemical shifts of the N-CH3protons for a series of 1-methyl-2-quinolone derivatives has been studied. Compounds with an 8-methyl substituent exhibit a slight downfield shift.

ISSN:0038-7010    

DOI:10.1080/00387017808067753

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

The13C n.m.r. spectra of a series of 1-methyl-2-quinolone derivatives are presented. The N-CH3and 8-CH3carbons each exhibit a characteristicperideshielding effect. The substituent effects caused by aperi-methyl group have been discussed and compared with effects previously observed in the naphthalene series.

ISSN:0038-7010    

DOI:10.1080/00387017808067754

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

The proton NMR spectra of dimethyl dichalcogenides and diethyl dichalcogenides were measured. The experimental results do not show the evidence for the existence of rotational isomerism in each molecules.

ISSN:0038-7010    

DOI:10.1080/00387017808067755

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0038-7010    

DOI:10.1080/00387017808067748

出版商:Taylor & Francis Group    

年代:1978

数据来源: Taylor