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| 1 | Comparisons of cropland area from multiple datasets over the past 300 years in the traditional cultivated region of China显示文摘陆地使用 / 盖住变化是在气候和生态的模拟的一个重要参数。尽管他们广泛地在社区,半自动地面防空系统数据集和 HYDE 数据集被使用了,二代表性的全球历史的陆地使用数据集,很少在地区性的规模关于他们的精确性被估计。这里,我们为中国(TCRC ) 的传统的栽培区域执行了一些评价在上持续 300 年,由把 SAGE2010 和 HYDE (v3.1 ) 与中国历史的农田数据集(CHCD ) 作比较。比较在三空间规模被执行:由 60 km 格子房间的全部学习区域,省的区域和 60 km。结果证明(1 ) 从 SAGE2010 的农田区域从 CHCD 是多于那的大部分;而且,以在 1950 以后的从 1700 ~ 1950 和 0.34% 的 0.51% 的率的生长从 CHCD 与那也不一致。(2 ) HYDE 数据集(v3.1 ) 在全部学习区域上比半自动地面防空系统数据集接近了 CHCD 数据集。然而,大偏爱能被 60 km 格子房间规模在省的规模和 60 km 检测。有比70%大的偏爱的格子房间的百分比(<-70%或>70%)并且90%(<-90%或>90%)当那些有的偏爱为仅仅5%6%从10%~10%并且从30%~30%报道 时,分别地说明了全部的格子房间的56%63%和40%45%并且17%全部的格子房间分别地。(3 ) 用本地历史的档案,有高精确性的历史的数据集将是改进气候和生态的模拟的精确性的一个珍贵方法重建。 | HE Fanneng LI Shicheng ZHANG Xuezhen GE Quansheng DAI Junhu | 2013 | Journal of Geographical Sciences2013，23，6： | 21 |
| 2 | Crop cover reconstruction and its effects on sediment retention in the Tibetan Plateau for 1900-2000显示文摘地理上明确的历史的陆地使用和陆地盖子数据集逐渐地在人的活动的气候、生态的效果的研究被要求。在这研究,把历史的人口数据用作一个代理, Qinghai 省的省的农田区域和西藏为 1900, 1930,和 1950 的自治区域(tar ) 被估计。为 1980 和 2000 的 Qinghai 和 TAR 的农田区域与修订从出版统计数据被获得。用为耕作模型的陆地适用性,为第 20 世纪的省的农田区域与 1 | LI Shicheng WANG Zhaofeng ZHANG Yili | 2017 | Journal of Geographical Sciences2017，27，7： | 16 |
| 3 | Apatite fission track dating evidence on the tectonization of Gangdese block, south Qinghai-Tibetan Plateau显示文摘This work makes the quantitative constrain on tectonizations of the Gangdese block, south Qinghai-Tibetan Plateau. Apatite fission track (AFT) dating analyses of 15 samples collected across the Gangdese block show that the Gangdese block went through two periods of tectonizations, during -37.2-18.5 Ma and 18.5 - 8.0 Ma in the south Gangdese block, and during -47.6-5.3 Ma and 5.3-0 Ma in the middle Gangdese block. Different upliftings did not take place in the first period and rapid uplifting occurred in the late period. Meantime, there are some differences be-tween the south and middle Gangdese block. Their uplifting rate is 180 m/Ma and 70 m/Ma respectively. The rapid up-lifting time in the middle Gangdese block lagged behind the time in the south Gangdese block. It is Chala-Jiacuo-Riduo fault zone that is similar to the Yarlung Zangbo fault zone in control of the tectonization. | YUAN Wanming WANG Shicheng LI Shengrong YANG Zhiqiang | 2002 | Chinese Science Bulletin2002，47，3： | 13 |
| 4 | A two-step lineage reprogramming strategy to generate functionally competent human hepatocytes from fibroblasts显示文摘Terminally differentiated cells can be generated by lineage reprogramming,which is,however,hindered by incomplete conversion with residual initial cell identity and partial functionality. Here, we demonstrate a new reprogramming strategy by mimicking the natural regeneration route, which permits generating expandable hepatic progenitor cells and functionally competent human hepatocytes. Fibroblasts were first induced into human hepatic progenitor-like cells (hHPLCs), which could robustly expand in vitro and efficiently engraft in vivo. Moreover, hHPLCs could be efficiently induced into mature human hepatocytes (hiHeps) in vitro, whose molecular identity highly resembles primary human hepatocytes (PHHs). Most importantly, hiHeps could be generated in large quantity and were functionally competent to replace PHHs for drug-metabolism estimation, toxicity prediction and hepatitis B virus infection modeling. Our results highlight the advantages of the progenitor stage for successful lineage reprogramming. This strategy is promising for generating other mature human cell types by lineage reprogramming. | Bingqing Xie Da Sun Yuanyuan Du Jun Jia Shicheng Sun Jun Xu Yifang Liu Chengang Xiang Sitong Chen Huangfan Xie Qiming Wang Guangya Li Xuehui LYU Hui Shen Shiyu Li Min Wu Xiaonan Zhang Yue Pu Kuanhui Xiang Weifeng Lai Peng Du Zhenghong Yuan Cheng Li Yan Shi Shichun Lu Hongkui Deng | 2019 | Cell Research2019，29，9： | 9 |
| 5 | Application of GIS in Mineral Resource Prediction of Synthetic Information显示文摘This paper introduces the formation mechanism and synthetic information prediction of large and superlarge deposits in Shandong Province by analyzing and studying on the GIS platform. The authors established a prospecting model of synthetic information from large and superlarge gold deposit concentration region, and the multi-source spatial database from concentration region of deposits and anomalies. On the basis of the spatial database, a target map layer, a model map layer and a predictive map layer were set up. Based on these map layers, geological variables of the model unit and predictive unit were extracted, then launched location and quantitative prediction of the gold deposit concentration region. The achievement of predicting large and superlarge deposits by the GIS platform has enabled the authors to design automation (or semi-automatic) interpretation subsystems, namely geophysics, geochemistry, geologic prospecting and comprehensive prognosis, and a set of the applicable GIS software for mineral resources prognosis of synthetic information. | Ye Shuisheng Wang Shicheng Li Deqiong Mineral Resources Institute of Comprehensive Information Prediction, Jilin University, Changchun 130026 | 2003 | Journal of China University of Geosciences2003，14，3： | 7 |
| 6 | Evaluating the accuracy of Chinese pasture data in global historical land use datasets显示文摘Global historical land use datasets are widely used in global environmental change studies; however, uncertainties in the included pasture data have not been evaluated. In this study, using trend, relative difference ratio(RDR), and spatial comparisons, we evaluated the accuracy of China pasture data in the HYDE(versions 3.1 and 3.2), SAGE, and PJ datasets using historical document-based reconstructions, including the land use datasets for China covering 1935–1997(hereafter Ge-dataset)and Northeast China covering the 1700 s–2000(hereafter Ye-dataset), and the satellite-based China's Land-Use/cover Datasets(CLUDs) for 1980–2015. Four important results were obtained.(1) China pasture area in the HYDE, SAGE, and PJ datasets and grassland area in the Ge-dataset, Ye-dataset, and CLUDs show both disparate trends and large differences in absolute values.(2)Spatially, 50.9%, 52.8%, and 63.0% pasture/grassland grids in 2000 had RDRs greater than 60% between HYDE3.1, HYDE3.2,and SAGE datasets, and CLUDs, respectively. The percentage of grids with RDRs less than 20% were 24.9%, 26.7%, and 16.0%,respectively.(3) Based on HYDE3.2, the spatial distribution of pasture in Northeast China over the last 300 year has expanded,which is in contrast to the results from the Ye-dataset, which shows the spatial distribution of grassland shrinking because of human reclamation activities.(4) The large contrasts between the global datasets and Chinese native datasets are due to differences in pasture/grassland definitions, land use practices, and spatial reconstruction methods. | Fanneng HE Shicheng LI Fan YANG Meijiao LI | 2018 | Science China Earth Sciences2018，61，11： | 7 |
| 7 | Reconstruction of cropland area and spatial distribution in the mid-Northern Song Dynasty (AD1004-1085)显示文摘为了理解历史的导致人的土地,盖住变化和它的气候的效果,与明确的空间信息创造历史的陆地使用数据集是必要的。用税农田区域和从历史的文件编的家庭的数字,我们在每陆(在北歌王朝的一个省级的政治区域) 以内估计了真实农田区域和人口在中间 -- 北歌王朝(AD1004-1085 ) 。评价通过分析税,人口和农业开发的当代的政策被完成。然后,我们把政治基于区域的农田区域变换成地理上明确的格子在由 60 km 的 60 km 的房间尺寸的基于房间的部分农田。变换作为独立变量用地志的斜坡,高度和人口密度基于每个格子房间的精明的耕作适用性。作为结果,在在 1070 年代的北歌领土以内的农田的全部的区域被估计是大约 7.2 亿亩(中国区域单位, 1 亩 = 666.7 m2 ) ,哪个 40.1% 和 59.9% 分别地发生在北方和南方。人口被估计是大约 8720 万,哪个 38.7% 和 61.3% 分别地在北方和南方,并且人均的农田区域是大约 8.2 亩。国家吝啬的开垦比率(即到全部的土地的农田区域的比率区域;RRA 此后为短) 是一回 16.6% 。平凡区域例如诺思中国平原,中间和长江的更低的活动范围, Guanzhong 平原,包围东廷·莱克和波伊昂·莱克和四川盆的平原,有更高的 RRA,主要是超过 40% ;当时多山、多山的区域例如 Nanling 山的南方,西南区域(排除 Chengdu 平原) ,黄土高原和东南沿海的区域,有更低的 RRA,是不到 20% 。而且, RRA 与地志的斜坡和高度变化了。在低高度(250 m ) 的区域,中间的高度(250100 m ) 和高高度(10003500 m ) ,有 4.43 亿, 2.15 亿并且 6400 万亩农田分别地并且他们的地区性的吝啬的 RRA 分别地是 27.5% , 12.6% 和 7.2% 。在扁平的斜坡,轻轻的斜坡,中等斜坡和陡峭的斜坡的区域,有 1.16 亿, 4.56 亿, 1.44 亿并且 200 万亩农田分别地并且他们的地区性的吝啬的 RRA 分别地是 34.6% , 20.7% , 8.5% 和 2.3% 。 | HE Fanneng LI Shicheng ZHANG Xuezhen | 2012 | Journal of Geographical Sciences2012，22，2： | 7 |
| 8 | Mulching mode and planting density affect canopy interception loss of rainfall and water use efficiency of dryland maize on the Loess Plateau of China显示文摘High and efficient use of limited rainwater resources is of crucial importance for the crop production in arid and semi-arid areas. To investigate the effects of different soil and crop management practices(i.e., mulching mode treatments: flat cultivation with non-mulching, flat cultivation with straw mulching, plastic-covered ridge with bare furrow and plastic-covered ridge with straw-covered furrow; and planting density treatments: low planting density of 45,000 plants/hm^2, medium planting density of 67,500 plants/hm^2 and high planting density of 90,000 plants/hm^2) on rainfall partitioning by dryland maize canopy, especially the resulted net rainfall input beneath the maize canopy, we measured the gross rainfall, throughfall and stemflow at different growth stages of dryland maize in 2015 and 2016 on the Loess Plateau of China. The canopy interception loss was estimated by the water balance method. Soil water storage, leaf area index, grain yield(as well as it components) and water use efficiency of dryland maize were measured or calculated. Results showed that the cumulative throughfall, cumulative stemflow and cumulative canopy interception loss during the whole growing season accounted for 42.3%–77.5%, 15.1%–36.3% and 7.4%–21.4% of the total gross rainfall under different treatments, respectively. Soil mulching could promote the growth and development of dryland maize and enhance the capability of stemflow production and canopy interception loss, thereby increasing the relative stemflow and relative canopy interception loss and reducing the relative throughfall. The relative stemflow and relative canopy interception loss generally increased with increasing planting density, while the relative throughfall decreased with increasing planting density. During the two experimental years, mulching mode had no significant influence on net rainfall due to the compensation between throughfall and stemflow, whereas planting density significantly affected net rainfall. The highest grain yield and water use efficiency of dryland maize were obtained under the combination of medium planting density of 67,500 plants/hm^2 and mulching mode of plastic-covered ridge with straw-covered furrow. Soil mulching can reduce soil evaporation and retain more soil water for dryland maize without reducing the net rainfall input beneath the maize canopy, which may alleviate the contradiction between high soil water consumption and insufficient rainfall input of the soil. In conclusion, the application of medium planting density(67,500 plants/hm^2) under plastic-covered ridge with bare furrow is recommended for increasing dryland maize production on the Loess Plateau of China. | ZHENG Jing FAN Junliang ZHANG Fucang YAN Shicheng GUO Jinjin CHEN Dongfeng LI Zhijun | 2018 | Journal of Arid Land2018，10，5： | 6 |
| 9 | Clinical Characteristics of Hospitalized Patients with SARS-CoV-2 and Hepatitis B Virus Co-infection显示文摘Dear Editor,Coronavirus disease 2019(COVID-19)is a global pandemic caused by severe acute respiratory syndrome coronavirus 2(SARS-Co V-2).SARS-Co V-2 infection was first detected in Wuhan,China in late December 2019.The virus was spreading rapidly to other cities of China and accumulating cases had been reported(Li et al.2020). | Xiaoping Chen Qunqun Jiang Zhiyong Ma Jiaxin Ling Wenjia Hu Qian Cao Pingzheng Mo Lei Yao Rongrong Yang Shicheng Gao Xien Gui Wei Hou Yong Xiong Jinlin Li Yongxi Zhang | 2020 | Virologica Sinica2020，35，6： | 6 |
| 10 | Cancer metabolism and tumor microenvironment:fostering each other?显示文摘The changes associated with malignancy are not only in cancer cells but also in environment in which cancer cells live.Metabolic reprogramming supports tumor cells’high demand of biogenesis for their rapid proliferation,and helps tumor cells to survive under certain genetic or environmental stresses.Emerging evidence suggests that metabolic alteration is ultimately and tightly associated with genetic changes,in particular the dysregulation of key oncogenic and tumor suppressive signaling pathways.Cancer cells activate HIF signaling even in the presence of oxygen and in the absence of growth factor stimulation.This cancer metabolic phenotype,described firstly by German physiologist Otto Warburg,ensures enhanced glycolytic metabolism for the biosynthesis of macromolecules.The conception of metabolite signaling,i.e.,metabolites are regulators of cell signaling,provides novel insights into how reactive oxygen species(ROS)and other metabolites deregulation may regulate redox homeostasis,epigenetics,and proliferation of cancer cells.Moreover,the unveiling of noncanonical functions of metabolic enzymes,such as the moonlighting functions of phosphoglycerate kinase 1(PGK1),reassures the importance of metabolism in cancer development.The metabolic,microRNAs,and ncRNAs alterations in cancer cells can be sorted and delivered either to intercellular matrix or to cancer adjacent cells to shape cancer microenvironment via media such as exosome.Among them,cancer microenvironmental cells are immune cells which exert profound effects on cancer cells.Understanding of all these processes is a prerequisite for the development of a more effective strategy to contain cancers. | Yiyuan Yuan Huimin Li Wang Pu Leilei Chen Dong Guo Hongfei Jiang Bo He Siyuan Qin Kui Wang Na Li Jingwei Feng Jing Wen Shipeng Cheng Yaguang Zhang Weiwei Yang Dan Ye Zhimin Lu Canhua Huang Jun Mei Hua-Feng Zhang Ping Gao Peng Jiang Shicheng Su Bing Sun Shi-Min Zhao | 2022 | Science China(Life Sciences)2022，65，2： | 5 |
| 11 | An ice-core record of vegetation and climate changes in the central Tibetan Plateau during the last 550 years显示文摘We present a 550-year ice-core pollen record with a 5-year resolution from the Puruogangri ice field in the central Tibetan Plateau.Analysis of the relationship between pollen record and instrumental observations suggests that the sum of the steppe and meadow pollen taxa is a good indicator of summer (June-August) temperature,whereas the ratios of Cyperaceae/(Gramineae+Artemisia) [Cy/(G+A)] as well as M/S (meadow to steppe percentages) are indicative of humidity changes in this region.Together with δ18O and glacial accumulation records,the response of vegetation to climate change over the past 500 years was revealed.Desert vegetation dominated during 1450-1640 AD,a time period characterized by cold-wet climate,while steppe vegetation expanded during 1640-1915 when warm-dry climate prevailed.Afterwards,during a cold and humid period,desert vegetation expanded again.Since 1980-2002,due to the increase of summer temperatures,steppe and meadow vegetation predominates,while areas with desert vegetation are reduced.This proxy series is the first high-resolution ice-core pollen record spanning the last 550 years for the central Tibetan Plateau. | YANG Bao TANG LingYu LI ChunHai SHAO YaJun TAO ShiCheng YANG LunQing | 2010 | Chinese Science Bulletin2010，55，12： | 4 |
| 12 | Generation of tooth-like structures from integration-free human urine induced pluripotent stem cells显示文摘Background:Tooth is vital not only for a good smile,but also good health.Yet,we lose tooth regularly due to accidents or diseases.An ideal solution to this problem is to regenerate tooth with patients’own cells.Here we describe the generation of tooth-like structures from integration-free human urine induced pluripotent stem cells(ifhU-iPSCs).Results:We first differentiated ifhU-iPSCs to epithelial sheets,which were then recombined with E14.5 mouse dental mesenchymes.Tooth-like structures were recovered from these recombinants in 3 weeks with success rate up to 30%for 8 different iPSC lines,comparable to H1 hESC.We further detected that ifhU-iPSC derived epithelial sheets differentiated into enamel-secreting ameloblasts in the tooth-like structures,possessing physical properties such as elastic modulus and hardness found in the regular human tooth.Conclusion:Our results demonstrate that ifhU-iPSCs can be used to regenerate patient specific dental tissues or even tooth for further drug screening or regenerative therapies. | Jinglei Cai Yanmei Zhang Pengfei Liu Shubin Chen Xuan Wu Yuhua Sun Ang Li Ke Huang Rongping Luo Lihui Wang Ying Liu Ting Zhou Shicheng Wei Guangjin Pan Duanqing Pei | 2013 | Cell Regeneration2013，2，1： | 4 |
| 13 | High-efficiency Joining of C_f/Al Composites and TiAl Alloys under the Heat Effect of Laser-ignited Self-propagating High-temperature Synthesis显示文摘The aim of this study was to develop a high-efficiency joining method of Cf/Al composites and TiA l alloys under the heat effect of laser-ignited self-propagating high-temperature synthesis(SHS). The SHS reaction of Ni–Al–Zr interlayer was induced by laser beam and acted as local high-temperature heat source during the joining. Sound joint was obtained and verified the feasibility of this joining method. Effect of filler metals on the joint microstructure and shear strength was evaluated. When the joining pressure was 2 MPa with additive filler metals, joint shear strength reached the maximum of 41.01 MPa. | Zhuoran Li Guangjie Feng Shiyu Wang Shicheng Feng | 2016 | Journal of Materials Science & Technology2016，32，11： | 4 |
| 14 | Efficient Extraction of Lithium Ions from High Mg/Li Ratio Brine through the Synergy of TBP and Hydroxyl Functional Ionic Liquids显示文摘of main observation and conclusion The extraction of Li^+from the high Mg/Li ratio brine was performed using hydroxyl functional ionic lic-uids(ILs)as the coextractant and tributyl phosphate(TBP)as the extractant.irsty the extractive system,1-2-hydroxyethyl-3-mnethylimidazolumbis(trifuoromethylsulfonyl)imide([HOEmim][NTf2])+TBP was proved to exhibit the highest extraction efficiency of Li^+(88.15%)from LiCl aqueous solutions among the extractants composed of differents TB P,and ls+TBP.Effects of various extraction parameters on the extraction eficiencies of Li^+and Mg^2+were then investigated.95.01%of Li^+was extracted and the Li^+/Mg^2+separation factor reached 405.76 in a singl-stage at 278.15 Kand O/A of 2:1.The extraction complexes were determined by the slope analysis method and ESI-MS analysis,and the metal complexes in the organic phase were indcated to be mainly[L-2TBP][NTf;J.The striping study showed that 92.86%of i*was stripped with 1.0 mol·L^-1 HCl.98%extraction capacity of the synergyextractants was remained after 5 regeneration cycles.The thermodynamic parameters(△G°,△H°,and△S°),together with the mechanism of the Li^+extraction were further demonstrated finally,According to the results,[HOEmim][NTf2]+TBP extraction system showed promising performance in extracting lithium from salt lake brine with high Mg/Li ratio. | Ruibing Bai Junfeng Wang Li Cui Shicheng Yang Wei Qian Penglei Cui Yanqiang Zhang | 2020 | Chinese Journal of Chemistry2020，38，12： | 4 |
| 15 | Copy number variations of HLA-DRB5 is associated with systemic lupus erythematosus risk in Chinese Han population显示文摘全身的豺狼座 erythematosus (SLE ) 是复合基因,全身的、自体免疫的疾病。拷贝数字变体(CNVS ) 被发现了与很多复杂混乱被联系。我们拿了当前的学习在中国汉人口探索在 genomic CNVS 和 SLE 之间的潜在的协会。在发现阶段,七个 SLE 病人在屏蔽测试与高密度的比较 genomic 杂交 microarrays 被检查因为 SLE 联系了 CNVS。在确认阶段,然后, 135 个 SLE 病人和 219 个匹配的健康题目被 AccuCopy 技术为基因 HLA-DRB5 的 CNVS 调查。量的聚合酶链反应被执行在 SLE 病人决定拷贝数字(CN ) 和 HLA-DRB5 的 mRNA 水平。尽管在在 SLE 病人的 CN 删除组和 CN 正常的组之间的 HLA-DRB5 的 mRNA 水平不是统计上积极的( P = 0.46 ),我们的结果仍然比在健康控制在 SLE 病人显示出 HLA-DRB5 的更多的 CN ( P = 3.98 業慮瑮愠摮爠'酞棙M敶洠摯汥漠?偔?挠摯湯?′敷敲瀠牥潦浲摥?敲灳'虡N敶祬?剏?ㄠ????‥??ㄠ???劳?倠吗?? | Lijun Wu Shicheng Guo Dongqin Yang Yanyun Ma Hengdong Ji Yulin Chen Jun Zhang Yi Wang Li Jin Jiucun Wang Jie Li | 2014 | Acta Biochimica et Biophysica Sinica2014，46，2： | 3 |
| 16 | Chloroplast genomic diversity in Bulbophyllum section Macrocaulia(Orchidaceae,Epidendroideae,Malaxideae):Insights into species divergence and adaptive evolution显示文摘Bulbophyllum is the largest genus in Orchidaceae with a pan tropical distribution.Due to highly significant diversifications,it is considered to be one of the most taxonomically and phylogenetically complex taxa.The diversification pattern and evolutionary adaptation of chloroplast genomes are poorly understood in this species-rich genus,and suitable molecular markers are necessary for species determination and phylogenetic analysis.A natural Asian section Macrocaulia was selected to estimate the interspecific divergence of chloroplast genomes in this study.Here,we sequenced the complete chloroplast genome of four Bulbophyllum species,including three species from section Macrocaulia.The four chloroplast genomes had a typical quadripartite structure with a genome size ranged from 156,182 to 158,524 bp.The chloroplast genomes included 113 unique genes encoding 79 proteins,30 tRNAs and 4 rRNAs.Comparison of the four chloroplast genomes showed that the three species from section Macrocaulia had similar structure and gene contents,and shared a number of indels,which mainly contribute to its monophyly.In addition,interspecific divergence level was also great.Several exclusive indels and polymorphism SSR loci might be used for taxonomical identification and determining interspecific polymorphisms.A total of 20 intergenic regions and three coding genes of the most variable hotspot regions were proposed as candidate effective molecular markers for future phylogenetic relationships at different taxonomical levels and species divergence in Bulbophyllum.All of chloroplast genes in four Bulbophyllum species were under purifying selection,while 13 sites within six genes exhibited sitespecific selection.A whole chloroplast genome phylogenetic analysis based on Maximum Likelihood,Bayesian and Parsimony methods all supported the monophyly of section Macrocaulia and the genus of Bulbophyllum.Our findings provide valuable molecular markers to use in accurately identifying species,clarifying taxonomy,and resolving the phylogeny and evolution of the genus Bulbophyllum.The molecular markers developed in this study will also contribute to further research of conservation of Bulbophyllum species. | Hanqing Tang Lu Tang Shicheng Shao Yulan Peng Lu Li Yan Luo | 2021 | Plant Diversity2021，43，5： | 3 |
| 17 | Comparison of changes in land use and land cover in China and the USA over the past 300 years显示文摘在在在长时间规模上的不同国家之间的陆地使用和陆地盖子的变化的比较研究在处于不同状况理解这些变化的过程和驱动力是有用的。我们在过去的 300 年比较了并且分析在瓷器大陆和有共同边界的美国之间的农田,森林和草地的时间、空间的特征。我们发现在过去的 300 年,农田的区域在中国并且在 USA 显示出一个全面增加趋势。在中国,农田的区域增加了大约 79.46 ? 慷浲湩 ? 湡 ? 湩牣慥楳杮挠楬慭整攠瑸敲敭攠敶瑮 ? 潷汵? 污整 ? 桴 ? 慭湧瑩摵 ? 湡 ? 灳瑡潩整灭牯污瀠瑡整湲 ? 景朠潬慢 ? 整牲獥牴慩?偎 | HE Fanneng LI Meijiao LI Shicheng XIAO Ran | 2015 | Journal of Geographical Sciences2015，25，9： | 3 |
| 18 | Exploration of the enhanced performances for silk fibroin/sodium alginate composite coatings on biodegradable Mg-Zn-Ca alloy显示文摘To expand the future clinic applications of biodegradable magnesium alloy,polymer coatings with excellent biocompatibility are the keys to solve the local alkalinity and rapid hydrogen release.Natural-organic silk fibroin provides an approach to fabricate a protective coating on biomedical Mg-Zn-Ca alloy,however,the adhesion force and mechanical properties of the coating on substrates are ought to be further improved without any chemical conversion/intermediate layer.Hereby,based on VUV/O;surface activation,a hybrid of silk fibroin and sodium alginate is proposed to enhance the adhesion force and mechanical properties of the composite coatings on hydrophilic Mg-Zn-Ca alloy surfaces.Various mass ratios of sodium alginate addition were investigated to achieve the optimum coating strategy.The nanoscratch test and nanoindentation test confirmed that the adhesion force was tripled and mechanical properties index was significantly improved when the mass ratio of silk fibroin/sodium alginate was 70/30 compared to pure silk fibroin or sodium alginate coatings.Meanwhile,the corrosion rate of the coated Mg-Zn-Ca alloy was significantly delayed with the addition of sodium alginate,resulting in a reaction layer during corrosion process.Furthermore,the mechanisms for both adhesion and corrosion processes were discussed in detail.Our findings offer more possibilities for the controllable surface performance of degradable metals. | Hui Fang Chenxi Wang Shicheng Zhou Ge Li Yanhong Tian Tadatomo Suga | 2021 | Journal of Magnesium and Alloys2021，9，5： | 3 |
| 19 | A Positive Feedback Loop between Mesenchymal-like Cancer Cells and Macrophages Is Essential to Breast Cancer Metastasis显示文摘 | Shicheng Su Qiang Liu Jingqi Chen Jianing Chen Fei Chen Chonghua He Di Huang Wei Wu Ling Lin Wei Huang Jin Zhang Xiuying Cui Fang Zheng Haiyan Li Herui Yao Fengxi Su Erwei Song | 2014 | Cancer Cell2014，，5： | 3 |
| 20 | Direct Current Control Strategy of SVG Based on Dual Sequence dq Coordinates Under Asymmetric Load Condition显示文摘In the case of asymmetric loads of power grid,load currents are composed of four components:positive sequence active and reactive components and negative sequence active and reactive components that can pollute the power grid with harmonics and reactive power and interrupt the normal operation of power grid.Therefore,increasing numbers of static var generators(SVGs)are used to stabilize the power grid.In this study,a new type of current compensation control strategy of a three-phase three-wire SVG under an asymmetric load is proposed.According to the symmetric component method and dual dq synchronous transformation theory,the load currents are transformed into four components under dual dq coordinates.Each component is compensated separately by the SVG.Simultaneously,the proportional-limiter method is adopted to minimize the harmonics from the SVG by optimizing the waveform of the modulation wave and limiting its amplitude.Finally,the validity and feasibility of the control strategy are verified by simulation and experimental results. | Shicheng Zheng Zhuangzhuang Li Menglin Cao | 2019 | Chinese Journal of Electrical Engineering2019，5，1： | 3 |
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