نتایج جستجو برای: caesium compounds
تعداد نتایج: 227423 فیلتر نتایج به سال:
We report the realisation and preliminary study of a frequency standard using a fountain of laser cooled caesium atoms. Our apparatus uses a magneto-optical trap as a source of cold atoms and optical pumping to prepare the atoms in the correct state before they enter the microwave cavity.
The optimal treatment for endometrial carcinoma is radical hysterectomy and hemivaginectomy with pre-operative caesium sources in the uterus and vaginal vault. Block pelvic lymphadenectomy is unsatisfactory, and gland extension is best treated by radiotherapy to the lateral pelvic and para-aortic fields. Surgery has a definite place in the treatment of advanced cases.
MALDI mass spectrometry in combination with post-source decay (PSD) analysis is a fast and easy to apply method for peptide sequencing. In this study, the PSD technique was used to investigate the influence of the adaption of one, two, and three caesium cations to angiotensin II in the gas phase. The PSD spectra of caesium-aggregated angiotensin II show far less fragmentation in comparison to t...
Measurements have been made of the relative photoileclric quantum eficiency ?(A) of SbCs3 cathodes of M ith Pyrex and quartz windows, from ~=200-650 mp. ?(A) depends on the window transinittame W(h), the cathode absorbance A(h, d) , the absolute photoelectric quantum efiiciency Qo(h) and the p/1otoelectron escape probability f (A, d). Comparison Irith other data has allowed the separation of th...
In this research work, we report the synthesis of macrocyclic diamides from the reaction of diesters and aliphatic diamines in the presence of caesium carbonate. It has been demonstrated that among the carbonate of alkali metals (Li2CO3, Na2CO3, K2CO3 and CS2CO3), CS2CO3 appear to be the best catalyst for macrocyclization. Diesters with different substitution patterns on the aromatic ring react...
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