The eXtensible markup language (XML) is a kind of new meta language for replacing HTML and has many advantages. Traditional engineering documents have too many expression forms to be expediently managed and have no dy...The eXtensible markup language (XML) is a kind of new meta language for replacing HTML and has many advantages. Traditional engineering documents have too many expression forms to be expediently managed and have no dynamic correlation functions. This paper introduces a new method and uses XML to store and manage engineering documents to realize the format unity of engineering documents and their dynamic correlations.展开更多
This paper describes optimization process of nozzle cup based on a device for contactless code marking to rough and contaminated surfaces--semiautomatic code marker. During tests using the CFD （computational fluid dy...This paper describes optimization process of nozzle cup based on a device for contactless code marking to rough and contaminated surfaces--semiautomatic code marker. During tests using the CFD （computational fluid dynamics） software different geometry of nozzle cups were compared by such parameters as pressure, velocity and direction of flow. Goal of digital experiments was to find sprayer nozzle geometry that can keep stream of paint in diameter of 10 mm on 10-20 mm distance. Main problem is to avoid low-pressure regions around the stream. The optimal geometry of nozzle cup is designed to get adjusted code dimensions on given distance展开更多
In eukaryotes, epigenetic-based mechanisms are involved in almost all the important biological processes. Amongst different epigenetic regulation pathways, the dynamic covalent modifications on histones are the most e...In eukaryotes, epigenetic-based mechanisms are involved in almost all the important biological processes. Amongst different epigenetic regulation pathways, the dynamic covalent modifications on histones are the most extensively investigated and characterized types. The covalent modifications on histone can be "read" by specific protein domains and then subsequently trigger downstream signaling events. Plants generally possess epigenetic regulation systems similar to animals and fungi, but also exhibit some plant-specific features. Similar to animals and fungi, plants require distinct protein domains to specifically"read" modified histones in both modification-specific and sequence-specific manners. In this review, we will focus on recent progress of the structural studies on the recognition of the epigenetic marks on histones by plant reader proteins, and further summarize the general and exceptional features of plant histone mark readers.展开更多
Much research effort has been made to understand various biological processes at levels of molecules using molecular imaging techniques. Because of great sensitivity, high resolution, and rapid detection, positron emi...Much research effort has been made to understand various biological processes at levels of molecules using molecular imaging techniques. Because of great sensitivity, high resolution, and rapid detection, positron emission tomography （PET） imaging is becoming one of the most used imaging techniques for medical diagnose and pre-clinical studies. Here we provide a review on molecular imaging and PET imaging. An introduction is also provided on ~SF-fluorine labeling techniques for the preparation of PET imaging probes. A summary and comparison of currently available ~SF-fluorine labeling methods is provided. The per- spectives for 18F-fluorine labeling techniques are also given.展开更多
文摘The eXtensible markup language (XML) is a kind of new meta language for replacing HTML and has many advantages. Traditional engineering documents have too many expression forms to be expediently managed and have no dynamic correlation functions. This paper introduces a new method and uses XML to store and manage engineering documents to realize the format unity of engineering documents and their dynamic correlations.
文摘This paper describes optimization process of nozzle cup based on a device for contactless code marking to rough and contaminated surfaces--semiautomatic code marker. During tests using the CFD （computational fluid dynamics） software different geometry of nozzle cups were compared by such parameters as pressure, velocity and direction of flow. Goal of digital experiments was to find sprayer nozzle geometry that can keep stream of paint in diameter of 10 mm on 10-20 mm distance. Main problem is to avoid low-pressure regions around the stream. The optimal geometry of nozzle cup is designed to get adjusted code dimensions on given distance
基金supported by the National Key R&D Program of China (2016YFA0503200)National Natural Science Foundation of China (31622032)the Chinese Academy of Sciences to Jiamu Du
文摘In eukaryotes, epigenetic-based mechanisms are involved in almost all the important biological processes. Amongst different epigenetic regulation pathways, the dynamic covalent modifications on histones are the most extensively investigated and characterized types. The covalent modifications on histone can be "read" by specific protein domains and then subsequently trigger downstream signaling events. Plants generally possess epigenetic regulation systems similar to animals and fungi, but also exhibit some plant-specific features. Similar to animals and fungi, plants require distinct protein domains to specifically"read" modified histones in both modification-specific and sequence-specific manners. In this review, we will focus on recent progress of the structural studies on the recognition of the epigenetic marks on histones by plant reader proteins, and further summarize the general and exceptional features of plant histone mark readers.
基金supported by the National Natural Science Foundation of China(11304156)the General Financial Grant fromthe China Postdoctoral Science Foundation(2013M531312)
文摘Much research effort has been made to understand various biological processes at levels of molecules using molecular imaging techniques. Because of great sensitivity, high resolution, and rapid detection, positron emission tomography （PET） imaging is becoming one of the most used imaging techniques for medical diagnose and pre-clinical studies. Here we provide a review on molecular imaging and PET imaging. An introduction is also provided on ~SF-fluorine labeling techniques for the preparation of PET imaging probes. A summary and comparison of currently available ~SF-fluorine labeling methods is provided. The per- spectives for 18F-fluorine labeling techniques are also given.
