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中国免签的“朋友圈”持续扩容

重庆与世界 2024年第6期 38-43页

作者： 1.中国领事服务网 2.新华网中国领事服务网新华网

今年以来，中国与巴勒斯坦、新加坡、泰国、安提瓜和巴布达等国签署的互免签证协定相继生效，中国对外单方面免签和互免签证的力度越来越大。外交部发言人表示，中国免签的“朋友圈”持续扩容，与越来越多国家正式迈入“免签时代”，其...

今年以来，中国与巴勒斯坦、新加坡、泰国、安提瓜和巴布达等国签署的互免签证协定相继生效，中国对外单方面免签和互免签证的力度越来越大。外交部发言人表示，中国免签的“朋友圈”持续扩容，与越来越多国家正式迈入“免签时代”，其积极效应正在不断显现。截至5月1.日，中国已与1.7个国家缔结涵盖不同护照的互免签证协定；与44个国家达成简化签证手续协定或安排；与2.个国家实现全面互免签证；还有60多个国家和地区给予中国公民免签或落地签证便利。

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以“千万工程”为指引打造“青农飞地”引育新农人助力乡村振兴

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中国共青团 2024年第7期 62-65页

作者： 1.团金华市委 2.团婺城区委团金华市委团婺城区委

习近平总书记在义乌李祖村考察调研时指出“乡村振兴为年轻人提供了展现才华的用武之地,希望更多的年轻人为乡村振兴发挥积极作用”。为深入学习贯彻习近平总书记关于实施乡村振兴战略的重要论述,共青团金华市委以“千万工程”为指引,... 详细信息

习近平总书记在义乌李祖村考察调研时指出“乡村振兴为年轻人提供了展现才华的用武之地,希望更多的年轻人为乡村振兴发挥积极作用”。为深入学习贯彻习近平总书记关于实施乡村振兴战略的重要论述,共青团金华市委以“千万工程”为指引,着力破解青年投身农创“不愿回、留不下、干不好”三个痛点、难点问题,率先在婺城区探索建设“青农飞地”省级共富试点,旨在建立政府主导、多方协同、市场化运作的青年农创枢纽平台,推动城乡之间各类创业资源和要素高效流通。

关键词：乡村振兴创业资源共富婺城区新农人飞地多方协同市场化运作

Parentage determination of an isolated Yangtze finless porpoise population Neophocaena phocaenoides asiaeorientalis in the Yangtze Tian-e-Zhou Baiji National Natural Reserve based on molecular data

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Progress in Natural Science:Materials International 2005年第2期15卷 54-61页

作者： XIA Junhong 1.2. ZHENG Jinsong 1.2. XU Limei 1.2.and WANG Ding1.(1. Institute of Hydrobiology, chinese Academy of sciences, Wuhan 430072.{2. 2. graduate school of the chinese Academy of sciences, Beijing 1.0039,{2.) Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China. graduate {1. of the {2. Academy of sciences Beijing 100039 China

Reproductive behaviors are poorly known for the Yangtze finless porpoise Neophocaena phocaenoides asiaeorientalis. In this study, the parentage of an isolated Yangtze finless porpoise population inhabiting the Yangtze Tian-e-Zhou Baiji National Natural Reserve is determined by analysis of microsatellite loci and mitochondrial DNA (mtDNA) control region sequences, and the porpoise's reproductive behaviors are studied. Overall 4 full parentage assignments and additional 3 single parentage assignments were determined for the population of 2. individuals. The analysis shows that their estimated reproductive cycle is shorter than that reported previously and there probably exists an overlapping between gestation and lactation period. The study also shows that the female does not show fidelity to a particular male for breeding and vice versa, the oldest males did not monopolize mating and the dominance rank could not be so strict for the porpoise society. Moreover, the porpoise's mating pattern and relatedness among candidate parents are discussed here. These results provide important information for making guidelines of management and conservation for this protected population.

关键词： Yangtze finless porpoise isolated population reproductive behavior parentage

Characteristics and geological significance of olivine xenocrysts in Cenozoic volcanic rocks from western Qinling

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Progress in Natural Science:Materials International 2006年第12期16卷 1300-1306页

作者： SU Benxun~ 1.2.**, ZHANG Hongfu~1. XIAO Yan~ 1.2.and ZHAO Xinmiao~ 1.2.(1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, chinese Academy of sciences, Beijing 1.002.,{2. 2. graduate school of chinese Academy of sciences, Beijing 1.0039,{2.) [a]State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China [b]graduate {1. of {2. Academy of sciences Beijing China

Cenozoic volcanic rocks from the Haoti, Dangchang County of the western Qinling Mountains, contain a few clearly-zoned olivines. These olivines are relatively big in grain sizes and usually have cracks or broken features. Their cores have similar compositions （Mg#=90.4-91.0） to those for the peridotitic xenoliths entrained in host volcanic rocks and their rims are close to the compositions of olivine phenocrysts （Mg#=85.5-81.9）. The CaO contents in these zoned olivines are lower than 0.1.. These features demonstrate that the clearly-zoned olivines are xenocrysts and disaggregated from mantle peridotites. The zoned texture was the result of the interaction between the olivine and host magma. Available data show that the volcanic rocks would have been derived from the mantle source metasomatized by subducted hydrathermally-altered oceanic crust. The formation of these Cenozoic volcanic rocks was perhaps related to the rapid uplift of the Tibetan Plateau.

关键词： Western Qinling Dangchang Haoti Cenozoic volcanic rocks olivine xenocrysts zoned texture.

Wind vector retrieval using dual polarization imagery of ASAR

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Progress in Natural Science:Materials International 2006年第11期16卷 1183-1187页

作者： SONG Guiting~ 1.2., HOU Yijun~1.* and QI Peng~1.1. Institute of Oceanology, {1. Academy of sciences, Qingdao 2.6071.{2. 2. graduate school, {1. Academy of sciences, Beijing 1.0039,{2.) [a]Institute of Oceanology Chinese Academy of Science Qingdao China [b]graduate {1. Chinese Academy of Sciences Beijing China

A new algorithm for retrieving wind vector using dual polarization imagery of advanced synthetic aperture radar (ASAR) is developed and tested. Based on the combination of co-polarization and cross-polarization, this new algorithm effectively eliminates the 1.0° ambiguity which occurs when using single imagery of the ASAR to retrieve wind vector. This algorithm also solves the problem that the retrieval results will break down on very small spatial scales. The results retrieved from dual polarization imagery of ASAR show that the wind speed and direction are in agreement with the data from Quikscat and buoy measurements. The root mean square errors of wind direction and speed between the retrieved results and data from Quikscat are 2.2.° and 0.53 m/s, respectively. Comparisons between the new method and the traditional method show that the new methods fit the buoy data and Quikscat data a little better than the traditional method in this image.

关键词： wind vector retrieval ASAR dual polarization.

Molecular cloning of growth hormone receptor (GHR) from common carp(Cyprinus carpio L.)and identification of its two forms of mRNA transcripts

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Progress in Natural Science:Materials International 2006年第11期16卷 1156-1163页

作者： SUN Xiaofeng~ 1.2., GUO Qionglin~1.*, HU Wei~1. WANG Yaping~1.and ZHU Zuoyan~1.1. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, {1. Academy of sciences, Wuhan 430072.{2. 2. graduate school of {1. Academy of sciences, Beijing 1.0039,{2.) [a]State key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences Wuhan China China [b]graduate {1. of {2. Academy of sciences Beijing China

The cDNA of growth hormone receptor (GHR) was cloned from the liver of 2.year common carp (Cyprinus carpio L.) by reverse transcription-polymerase chain reaction (RT-PCR) and rapid amplification of cDNA end (RACE). Its open reading frame (ORF) of 1.06 nucleotides is translated into a putative peptide of 602.amino acids, including an extracellular ligand-binding domain of 2.4 amino acids (aa), a single transmembrane domain of 2. aa and an intracellular signal-transduction domain of 334 aa. Sequence analysis indicated that common carp GHR is highly homologous to goldfish (Carassius auratus) GHR at both gene and protein levels. Using a pair of gene-specific primers, a GHR fragment was amplified from the cDNA of 2.year common carp, a 2.4 bp product was identified in liver and a 32. bp product in other tissues. The sequencing of the products and the partial genomic DNA indicated that the difference in product size was the result of a 97 bp intron that alternatively spliced. In addition, the 32. bp fragment could be amplified from all the tissues of 4-month common carp including liver, demonstrating the occurrence of the alternative splicing of this intron during the development of common carp. Moreover, a semi-quantitative RT-PCR was performed to analyze the expression level of GHR in tissues of 2.year common carp and 4-month common carp. The result revealed that in the tissues of gill, thymus and brain, the expression level of GHR in 2.year common carp was significantly lower than that of 4-month common carp.

关键词： growth hormone receptor (GHR) molecular cloning transcript expression analysis common carp.

Bio-regeneration of p-complexation desulfurization adsorbents

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Science china Chemistry 2005年第6期48卷 538-544页

作者： LI Wangliang1.2. XING Jianmin1. XIONG Xiaochao1.2. SHAN Guobin1.2.& LIU Huizhou1.1. Laboratory of Separation Science and Engineering, Institute of Process Engineering, chinese Academy of sciences, Beijing 1.0080,{2. 2. graduate school of the chinese Academy of sciences,Beijing 1.0039,{2. 1. Laboratory of Separation Science and Engineering Institute of Process Engineering Chinese Academy of Sciences 100080 Beijing China 2. graduate school of the {1. Academy of {2. 100039 Beijing China

The coupling of adsorption desulfurization and biodesulfurization is a new approach to produce clean fuels. Sulfur compounds are firstly adsorbed on adsorbents, and then the ad-sorbents are regenerated by microbial conversion. p-Complexation adsorbent, Cu(I)-Y, was ob-tained by ion exchanging Y-type zeolite with Cu2. and then by auto-reduction in helium at 450℃ for 3 h. Dibenzothiophene (DBT) was used as a model compound. The effects of cell concentra-tion, volume of oil phase, the ratio of aqueous phase to adsorbent on DBT desorption by a bac-terium were studied. The amounts of DBT desorbed and 2.HBP produced can be apparently increased with addition of n-octane. BDS activity can be improved by increasing cell concentra-tion and the ratio of water-to-adsorbent. 89% of DBT desorbed from the adsorbents can be converted to 2.HBP within 6 h and almost 1.0% within 2. h, when the volume ratio of oil-to-water was 1.5 mL/mL, the cell concentration was 60 g·L?1. and the ratio of adsorbent-to-oil was 0.03 g·mL?1. The amount of 2.HBP produced was strongly dependent on the volume ratio of oil-to- water, cell concentration and amount of adsorbent. Adsorption capacity of the regenerated ad-sorbent is 95% that of the fresh one after being desorbed with Pseudomonas delafieldii R-8, washed with n-octane, dried at 1.0℃ for 2. h and auto-reduced in He.

关键词： adsorption desulfurization p-complexation adsorbents bio-regeneration Pseudomonas delafieldii desorption.

Algebraically explicit analytical solu-tions for the unsteady non-Newtonian swirling flow in an annular pipe

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Science china(Physics,Mechanics & Astronomy) 2006年第4期49卷 396-400页

作者： CAI Ruixian1.& GOU Chenhua1.2.1. Institute of Engineering Thermophysics, {1. Academy of sciences, Beijing 1.0080,{2. 2. graduate school, {1. Academy of sciences, Beijing 1.0080,{2. 1. Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100080 China 2. graduate school Chinese Academy of Sciences Beijing 100080 China

This paper presents two algebraically explicit analytical solutions for the incompressible unsteady rotational flow of Oldroyd-B type in an annular pipe. The first solution is derived with the common method of separation of variables. The second one is deduced with the method of separation of variables with addition developed in recent years. The first analytical solution is of clear physical meaning and both of them are fairly simple and valuable for the newly developing computational fluid dynamics. They can be used as the benchmark solutions to verify the applicability of the existing numerical computational methods and to inspire new differencing schemes, grid generation ways, etc. Moreover, a steady solution for the generalized second grade rheologic fluid flow is also presented. The correctness of these solutions can be easily proven by substituting them into the original governing equation.

关键词： analytical solution, Oldroyd-B type fluid, swirling flow, non-Newtonian.

Explicit analytical solutions of the anisotropic Brinkman model for the natural convection in porous media(Ⅱ)

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Science china(Physics,Mechanics & Astronomy) 2005年第4期48卷 422-430页

作者： CAI Ruixian1. GOU Chenhua1. 2.& ZHANG Na1.1. Institute of Engineering Thermophysics, {1. Academy of sciences, Beijing 1.0080,{2. 2. graduate school, {1. Academy of sciences, Beijing 1.0080,{2. 1. Institute of Engineering Thermophysics Chinese Academy of Sciences 100080 Beijing China 2. graduate school Chinese Academy of Sciences 10080 Beijing China

Some algebraically explicit analytical solutions are derived for the anisotropic Brinkman model―an improved Darcy model―describing the natural convection in porous media. Besides their important theoretical meaning (for example, in analyzing the non-Darcy and anisotropic effects on the convection), such analytical solutions can be the benchmark solutions that can promote the development of computational heat and mass transfer. Some solutions considering the anisotropic effect of permeability have been given previously by the authors, and this paper gives solutions including the anisotropic effect of thermal conductivity and the effect of heat sources.

关键词： explicit analytical solution, porous medium, natural convection, Brinkman model, anisotropic.