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121. Hyperfine spectrum; Nonlinear optics; Degenerate four waves mixing; The equivalent grating; Isotope detecting.

122. In addition, carbon and nitrogen isotope and its ratio was important indicator in the riverine biogeochemistry study.

123. The Pb, S isotopic study shows that the mass migration and the fractional distillation of Pb isotope took place in the whole rock and in the cement.

124. The isotope ratio is directly used for comparing oils or gases.

125. There are differences between natural and adulterated juices in stable isotope ratio.

126. According to the clear geologic relation and information related about the isotope, the Neozoic volcanic activity can be divided into 10 stages.

127. Research on chemical components and isotope composition of carbon and hydrogen of natural gases from the Tarim basin shows that all discovered gases in this basin are thermogenic.

128. An UV nitrogen laser, which uses domestic hydrogen thyratron as switch and isotope as preionizer, is reported.

129. The geological cause of the mixed layer and its distributing characters are defined by spore pollen analysis, scanning electron microscope and C14 isotope test in this paper.

130. It is a radiological poison, specifically absorbed by bone marrow, and is used, especially the highly fissionable isotope Pu 239, as a reactor fuel and in nuclear weapons.

131. The studies of microelement, rare earth element and isotope compositions that the Huogeqi polymetallic ore field was formed in rift basin of back arc continental marging during Proterozoic Era.

132. This article briefly describes the thoughts, key points and test result of a low noise pulse amplifier used in Laser Isotope Mass Spectrometer.

133. A radioactive, inert, gaseous isotope of radon a half - life of 3.92 seconds.

134. Each element has at least one isotope with unstable nuclei that can undergo radioactive decay.

135. System stability (Ss) is one of the most important specifications of the Isotope mass spectrometer (IMS). It influences the quality of the data detected by the IMS directly.

135. Sentencedict.com try its best to collect and create good sentences.

136. Carbon isotope in soil carbonates is an important paleoclimate data carrier.

137. The mineral - fluid oxygen isotope exchange in granitic rocks is mainly a non - equilibrium one in open system.

138. Noble gas isotope has been widely used to identify sources of natural gas.

139. In this paper, we made use of silver-staining detection method instead of isotope labelling method for AFLP analysis in maize cauliflower and tomato.

140. A radioactive isotope of cobalt emits penetrating gamma rays that are used in radiation therapy.

141. Objective:To develop a method for determining the metabolites of nitrofuran antibiotics in aquatic products by HPLC-MS/MS using isotope internal standard dilution technique.

142. This paper analysed the carbon and oxygen isotope composition of brachiopods fossils from the Devonian Period in Sichuan Province.

143. But this isotope is radioactive and decays about six times faster than does uranium 238, which indicates that the fissile fraction was much higher in the distant past.

144. The first samples were made through a nuclear reaction involving fusion of an isotope of californium , 249 Cf , with one of oxygen, 18 O.

145. Combined diagnosis by abdominal X-Ray, serum AFP assay , liver ultrasound and isotope scan, arteriogram and CT may be helpful in the identification of the tumor nature.

146. BEIJING - Trace levels of radioactive isotope cesium-137 and cesium-134 were detected in the air of 13 of the Chinese mainland's 31 provincial-level regions on Monday, up from eight regions on Sunday.

147. On-line system was developed to gauge film thickness using isotope, by which the problem of difficulty in measuring wide film thickness was resolved.

148. The adding of stable isotope of iodine to the dissolver can improve the removal of 131I.

149. The isotope of uranium with mass number235, fissionable with slow neutrons.

150. The decomposition reaction of the complex anisole·BF3 is indispensable during the separation of boron-10 isotopes by chemical isotope exchange distillation between BF3 and the complex anisole·BF3.