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随着可再生能源资产交易量的迅猛增长，人们对新能源资产交易方式、交易周期、交易风险和可信度提出了新的要求。基于现有新能源产业链和生态圈以及新能源资产交易系统平台的状况，对可再生资产交易体系进行研究，对交易的参与方、交易流程、规则以及支撑技术进行了系统性梳理，提出基于区块链的新能源资产交易体系建设思路，给出新能源资产交易的业务流程和要求，对新能源资产交易推进过程中需要关注的要点进行了阐述。该研究旨在推进科研、产业、金融以及监管等环节对新能源体系的协同构建，解决新能源资产交易平台的关键技术问题，为新能源资产便捷化流通提供有效的系统性支撑。

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Petrologica et Mineralogica / Yanshi Kuangwuxue Zazhi is the property of Acta Petrologica et Mineralogica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Big Data Research (2096-0271) is the property of Beijing Xintong Media Co., Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Progress in Modern Biomedicine is the property of Publishing House of Progress in Modern Biomedicine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Progress in Modern Biomedicine is the property of Publishing House of Progress in Modern Biomedicine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Fly Ash Comprehensive Utilization is the property of Hebei Fly Ash Comprehensive Utilization Magazine Co., Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Railway Signalling & Communication Engineering is the property of Railway Signalling & Communication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Donghua University (Natural Science Edition) is the property of Journal of Donghua University (Natural Science) Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Railway Signalling & Communication Engineering is the property of Railway Signalling & Communication Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Tiangong University is the property of Journal of Tianjin Polytechnic University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

BACKGROUND: In the past twenty years, methods for metal isotopes analysis(iron, copper, zinc, magnesium, calcium, lithium, molybdenum, selenium, mercury, chromium, cadmium, alum, barium, titanium, etc.) have been established. The sample pretreatment during metal isotope analysis includes two processes: the digestion of the sample; and the separation and purification of the analyzed elements. In order to ensure the accuracy and precision of metal isotopes data, two general principles of sample treatment must be followed. Elements that may interfere with the isotope analysis of the analyzed elements should not be introduced into the analysis. The analyzed elements should not be lost during the experiment. OBJECTIVES: In order to understand the pretreatment methods for metal isotope analysis. METHODS: Common sample digestion methods and chemical separation(ion exchange separation） were introduced in detail and were discussed in this paper. RESULTS: The common sample digestion method for metal isotope analysis is the acid dissolution method(Teflon bombs and microwave digestion). The separation and purification of the element to be measured mainly uses the ion exchange separation method. The same resin can be used for the chemical separation of different elements, and the same element can also be chemically separated by using different resins. The matrices of different types of samples are quite different, and different processes are required to separate the analyzed elements. The separation requirements of different samples can be met by changing the separation process of the predecessors, including changing the resin or the amount, changing the eluent or the amount, and increasing the separation steps. CONCLUSIONS: Based on the authors’ experience, details should be paid attention to during treatments for metal isotope analysis:（1）HClO4 must be thoroughly removed at high temperature during sample digestion, because its strong oxidization can destroy the effectiveness of resins;（2）when the same volume of resin is put into the column, the thinner the column is, the slower the flow rate of the eluent, and the later elution of the elements to be measured;（3）the smaller the volume of the eluent added each time, the better the separation effect during ion exchange purification. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

BACKGROUND: One Rb - Sr certified reference materials (GBW04411) and one Sm - Nd certified reference materials (GBW04419) for geological age, which are potash feldspar and basalt respectively, were produced and certified about 30 years ago. They have only one certified value and their matrices differ from many other geological samples. To better assess the quality of chromatographic separation, measurement procedures and mass spectrometry performance when analyzing Rb - Sr and Sm - Nd, three CRMs which are peridotite, eclogite and granite for Rb - Sr and Sm - Nd analysis were produced, and labelled GBW04139, GBW04140 and GBW04141 respectively. OBJECTIVES: To prepare certified reference materials for analysis of Rb - Sr and Sm - Nd isotopes of different types of rocks. METHODS: Peridotite, eclogite and granite from typical areas in China were used as candidates. Referring to 'Determinations for isotopes of lead, strontium and neodymium in rock samples (GB/T 17672-1999)', 'Determination of Rb Sr isotopic geological age and Sr isotope ratio in rocks and minerals (DZ/T 0184. 4— 1997), Determination of Sm - Nd isotopic geological age and Nd isotope ratio in rocks and minerals (DZ/T 0184.6-1997), Rb, Sr, Sm and Nd were purified by chromatographic separation, and their concentrations were analyzed by ID - TIMS, 87Sr/ 86Sr and 143Nd/ 144Nd ratios were determined by TIMS and MC - ICP-MS, respectively. RESULTS: For homogeneity testing of the three CRMs, fifteen bottles of each were randomly selected (from the 200 bottles prepared) for analysis. F-testing was used to study homogeneity. The result was insignificant (1

Facing the profound changes of education modes, user demands, technical environments and the like, libraries need to make strategic thinking and active response in the aspects of functional positioning, innovation introduction, and ecological construction. Grasping the core line of resources and services, we have to build a collaborative and synergetic system in university libraries, which is an organic system featured with crisis awareness, flexible adaptability, strong adaptability and wide connectivity. Relying on the system, we can create the library's new direction, new kinetic energy and new ecology. The paper summarizes the practices and experiences of collaborative and synergetic system in Tsinghua University Library during the COVID-19 outbreak. [ABSTRACT FROM AUTHOR]

Copyright of China Surfactant Detergent & Cosmetics (1001-1803) is the property of China Surfactant Detergent & Cosmetics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to analyze the intersection traffic conditions better and provide data for traffic flow detection and traffic congestion identification, the vehicle queue length of intersection was investigated based on the probability theory.The number of vehicles into/out the intersection and time were used to fit vehicle-time curve. The correction of starting time was established for revising the time from the vehicle driving into the intersection to the vehicle leaving the intersection.The speed-distance model was established to deduce the correction of starting time by analyzing the traffic flow status, and the calculation method of the vehicle queue length was deduced by the differential and integral calculus method.The Hongqi street and Huxi road intersection traffic data in Changchun city were taken as example, and the experiment was carried out to verify the method. The results show that the method can conveniently collect data with simple facility layout, which makes the method easier for large-scale application.The relative errors of E of 14 time points in 16 time points are less than 6% in the queue length, which illuminates that the calculation method is accurate enough for the measurement of vehicle queue length of intersection. [ABSTRACT FROM AUTHOR]

Copyright of Acta Geoscientica Sinica is the property of Acta Geoscientica Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Geoscientica Sinica is the property of Acta Geoscientica Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)