candidates of OH/IR stars with SiC circumstellar envelope are given in this paper. It is shown from further study that among them 4 sources are indeed, 2 are possible both carbon stars with SiC feature and OH/IR stars...candidates of OH/IR stars with SiC circumstellar envelope are given in this paper. It is shown from further study that among them 4 sources are indeed, 2 are possible both carbon stars with SiC feature and OH/IR stars with OH maser emission in 1612 MHz.展开更多
Resulting from the rising levels of atmospheric carbon, ocean acidification has become a global problem. It has significant impacts on the development, survival, growth and physiology of marine organisms. Therefore, a...Resulting from the rising levels of atmospheric carbon, ocean acidification has become a global problem. It has significant impacts on the development, survival, growth and physiology of marine organisms. Therefore, a high- precision sensor is urgently needed to measure the pH of sea-water. Iridium wire with a diameter of 0.25 mm is used as the substrate, and an Ir/Ir（OH）x pH electrode is prepared by a one-step electrochemical method in a LiOH solution at the room temperature. A scanning electron microscope （SEM） observation reveals that it is coated with nanoscale particles. In laboratory tests, the electrode exhibits a very promising pH response, with an ideal Nernst slope （56.14-59.52）, fast response, good stability and long fife-span in tested pH buffer solutions. For a sea trial, four pH electrodes and one Ag/AgC1 reference electrode are integrated with a self-made chemical sensor, and a profile detection of nearly 70 m is implemented near Newport Harbor, California on August 3, 2015. The results reflect that the pH value measured by the sensor is very close to the data given by Sea-Bird 911 plus CTD, with a difference value ranging from 0.000 075 to 0.064 719. And the sensor shows a better data matching degree in 0-40 m water depth. In addition, the high precision and accuracy of the sensor make it possible to use in the ocean observation field.展开更多
There are a lot of anominally anhydrous rock-forming minerals with various occurrences, in which the existence of OH or H<sub>2</sub>O has been demonstrated so far.Researches on the structural OH in abyssa...There are a lot of anominally anhydrous rock-forming minerals with various occurrences, in which the existence of OH or H<sub>2</sub>O has been demonstrated so far.Researches on the structural OH in abyssal or mantle-derived minerals are of展开更多
文摘candidates of OH/IR stars with SiC circumstellar envelope are given in this paper. It is shown from further study that among them 4 sources are indeed, 2 are possible both carbon stars with SiC feature and OH/IR stars with OH maser emission in 1612 MHz.
基金The Key Laboratory Project of State Oceanic Administration for Marine Ecosystem and Biogeochemistry of China under contract No.529101-X21601the Foundation from Wendy Schmidt Ocean Health XPRIZE and the Southern California Coastal Water Research Project
文摘Resulting from the rising levels of atmospheric carbon, ocean acidification has become a global problem. It has significant impacts on the development, survival, growth and physiology of marine organisms. Therefore, a high- precision sensor is urgently needed to measure the pH of sea-water. Iridium wire with a diameter of 0.25 mm is used as the substrate, and an Ir/Ir（OH）x pH electrode is prepared by a one-step electrochemical method in a LiOH solution at the room temperature. A scanning electron microscope （SEM） observation reveals that it is coated with nanoscale particles. In laboratory tests, the electrode exhibits a very promising pH response, with an ideal Nernst slope （56.14-59.52）, fast response, good stability and long fife-span in tested pH buffer solutions. For a sea trial, four pH electrodes and one Ag/AgC1 reference electrode are integrated with a self-made chemical sensor, and a profile detection of nearly 70 m is implemented near Newport Harbor, California on August 3, 2015. The results reflect that the pH value measured by the sensor is very close to the data given by Sea-Bird 911 plus CTD, with a difference value ranging from 0.000 075 to 0.064 719. And the sensor shows a better data matching degree in 0-40 m water depth. In addition, the high precision and accuracy of the sensor make it possible to use in the ocean observation field.
文摘There are a lot of anominally anhydrous rock-forming minerals with various occurrences, in which the existence of OH or H<sub>2</sub>O has been demonstrated so far.Researches on the structural OH in abyssal or mantle-derived minerals are of
