|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | The photoluminescence mechanism in carbon dots (graphene quantum dots, carbon nanodots, and polymer dots): Current state and future perspective显示文摘目前,光致发光(PL ) 的实际机制荧光灯碳点(CD ) 仍然是在研究人员之中的开的争论。因为 CD 的变化,为这些种碳材料总结 PL 机制是高度重要的;那么做能指导有效合成线路和新奇应用程序的开发。这评论将集中于 CD 的 PL 机制。三种类型荧光灯 CD 被包含:graphene 量点(GQD ) ,碳 nanodots (CND ) ,和聚合物点(PD ) 。四合理 PL 机制被证实了:被碳核心决定的量监禁效果或结合的 -domains, ;表面状态,它由碳脊梁和连接的化学的组的杂交坚定;分子状态,它完全坚定由荧光灯分子在 CD 的表面或内部上连接了;并且提高交叉连接的排放(C ) 效果。为 CD 给一篇彻底的摘要,范畴和合成线路,以及化学 / 物理的性质,简短预先被介绍。 | Shoujun Zhu Yubin Song Xiaohuan Zhao Jieren Shao Junhu Zhang Bai Yang | 2015 | Nano Research2015，8，2： | 120 |
| 2 | Land use changes and their relations with carbon cycles over the past 300 a in China显示文摘Land use and land cover in China have changed greatly during the past 300 a, indicated by the rapid abrupt decrease of forest land area and the rapid increase of cropland area, which can affect terrestrial carbon cycle greatly. The first-hand materials are used to analyze main characteristics for land use and land cover changes in China during the study period. The following conclusions can be drawn from this study. The cropland area in China kept increasing from 60.78×106 hm2 in 1661 to 96.09×106 hm2 in 1998. Correspondingly, the forest land area decreased from 248.13×106 hm2 in 1700 to 109.01×106 hm2 in 1949. Affected by such changes, the terrestrial ecosystem carbon storage decreased in the mean time. Car-bon lost from land use and land cover changes mainly consist of the loss from vegetation biomass and soil. In the past 300 a, about 3.70 PgC was lost from vegetation biomass, and emissions from soil ranged from 0.80 to 5.84 PgC. The moderate evaluation of soil losses was 2.48 PgC. The total loss from vegetation and soil was between 4.50 and 9.54 PgC. The moderate and optimum evaluation was 6.18 PgC. Such carbon losses distribution varied spatially from region to region. Carbon lost more significantly in Northeast China and Southwest China than in other regions, because losses of forest land in these two regions were far greater than in the other regions during the past 300 a. And losses of carbon in the other regions were also definite, such as Inner Mongolia, the western part of South China, the Xinjiang Uygur Autonomous Region, and the Qinghai-Tibet Plateau. But the carbon lost very little from the traditional agricultural regions in China, such as North China and East China. Studies on the relationship between land use and land cover change and carbon cycle in China show that the land use activities, especially those related to agriculture and forest management, began to affect terrestrial carbon storage positively in recent years. | GE QuanSheng DAI JunHu HE FanNeng PAN Yuan WANG MengMai | 2008 | Science China Earth Sciences2008，51，6： | 30 |
| 3 | 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 |
| 4 | Forest change of China in recent 300 years显示文摘基于历史的文件,现代调查和统计,以及前辈研究,趋势和森林动力学的主要过程的结果被认出。森林区域和森林范围从 1700 ~ 1949 | HE Fanneng GE Quansheng DAI Junhu RAO Yujuan | 2008 | Journal of Geographical Sciences2008，18，1： | 15 |
| 5 | The spatiotemporal characteristics of spring phenophase changes of Fraxinus chinensis in China from 1952 to 2007显示文摘We selected widely distributed and well observed plant species Fraxinus chinensis to study the formation mechanism of geographical distribution of the plant phenophase changes and revealed their spatiotemporal dynamics in China. Based on the first leaf date (FLD) data at 12 sites derived from Chinese Phenological Observation Network (CPON) and related meteorological data, we developed and validated the process-based model of FLD for Fraxinus chinensis. After reconstructing data series of FLD for Fraxinus chinensis over the study area from 1952 to 2007, we analyzed different spatiotemporal patterns of phenophase changes of this species. The results suggested that the process-based model was able to simulate the FLD accurately for Fraxinus chinensis on large spatial and temporal scales, because of the consideration of different budding rate responded to the air temperatures during the dormancy and the quiescence in accordance with the physiological mechanism of plants. The geographical distribution of the spring phenology in temperate regions was determined by the spatial pattern of daily average air temperature. The changes of FLD for Fraxinus chinensis revealed significant phenological advances in most areas. However, it showed delayed trends in a few sites. The overall average change trend was 1.1 days/decade. This result was consistent with the advanced trend in other regions of the North Hemisphere. The changes of FLD showed a noticeable regional variation with clearer advance in the north than in the south. The FLD in northern China showed an average advance as high as 2.0 days/decade (P<0.01). And the advance in northeastern and northwestern China was respectively 1.5 and 1.4 days/decade (P<0.01). Furthermore, eastern and central regions showed a minor trend, which was 1.0 days/decade (P<0.05). The smallest and non-significant advance appeared in southwestern and southern China. | WANG HuanJiong DAI JunHu GE QuanSheng | 2012 | Science China Earth Sciences2012，55，6： | 15 |
| 6 | Reponses and sensitivities of maize phenology to climate change from 1981 to 2009 in Henan Province, China显示文摘与全球温暖,响应气候变化的庄稼 phenological 移动成为了一个热研究话题。基于长期的观察 agro 气象学的 phenological 数据(1981-2009 ) 和气象学的数据,我们时间、空间的分析的份量上变在玉米物候学和他们的敏感给因素用气候趋势改变的气候调音率和敏感分析方法。结果显示播种朋友显著地被耽搁,延期趋势率是 9.0 d ?????????????????? ┴吗?? | LIU Yujie QIN Ya GE Quansheng DAI Junhu CHEN Qiaomin | 2017 | Journal of Geographical Sciences2017，27，9： | 14 |
| 7 | Frequency comparative study of coal-fired fly ash acoustic agglomeration显示文摘Particulate pollution is main kind of atmospheric pollution.The fine particles are seriously harmful to human health and environment.Acoustic agglomeration is considered as a promising pretreatment technology for fine particle agglomeration.The mechanisms of acoustic agglomeration are very complex and the agglomeration efficiency is affected by many factors.The most important and controversial factor is frequency.Comparative studies between high-frequency and low-frequency sound source to agglomerate coal- fired fly ash were carried out to investigate the influence of frequency on agglomeration efficiency.Acoustic agglomeration theoretical analysis,experimental particle size distributions (PSDs) and orthogonal design were examined.The results showed that the 20 kHz high-frequency sound source was not suitable to agglomerate coal-fired fly ash.Only within the size ranging from 0.2 to 0.25 μm the particles agglomerated to adhere together,and the agglomerated particles were smaller than 2.5 μm.The application of low-frequency (1000-1800 Hz) sound source was proved as an advisable pretreatment with the highest agglomeration efficiency of 75.3%,and all the number concentrations within the measuring range decreased.Orthogonal design L16 (4) 3 was introduced to determine the optimum frequency and optimize acoustic agglomeration condition.According to the results of orthogonal analysis,frequency was the dominant factor of coal-fired fly ash acoustic agglomeration and the optimum frequency was 1400 Hz. | Jianzhong Liu Jie Wang Guangxue Zhang Junhu Zhou Kefa Cen | 2011 | Journal of Environmental Sciences2011，23，11： | 13 |
| 8 | Spatiotemporal differentiation of changes in wheat phenology in China under climate change from 1981 to 2010显示文摘Phenology is a reliable biological indicator for reflecting climate change. An examination of changes in crop phenology and the mechanisms driving them is critical for guiding regional agricultural activities in attempts to adapt to climate change. Due to a lack of records based on continuous long-term observation, studies on changes in multiple consecutive phenological stages throughout a whole growing season on a national scale are rarely found, especially with regard to the spatiotemporal differentiation of phenological changes. Using a long-term dataset(1981-2010) of wheat phenology collected from 48 agro-meteorological stations in China, we qualified the spatiotemporal changes of 10 phenological stages as well as the length of wheat growth phases. Results showed that climate and wheat phenology changed significantly during the growing seasons from 1981 to 2010. On average, on a national scale, dates of sowing(0.19 d a-1), emergence(0.06 d a-1), trefoil(0.05 d a-1), and milk ripe(0.06 d a-1) showed a delaying trend, whereas dates of tillering(-0.02 d a-1), jointing(-0.15 d a-1),booting(-0.21 d a-1), heading(-0.17 d a-1), anthesis(-0.19 d a-1), and maturity(-0.10 d a-1) showed an advancing trend.Furthermore, the vegetative growth phase and growing season were shortened by 0.23 and 0.29 d a-1, respectively, whereas the reproductive growth phase was lengthened by 0.06 d a-1. Trends in dates of phenological stages or length of growing phases varied across wheat-planting regions. Moreover, spatiotemporal differentiation of sensitivity in growing season length(GSL) to variations in climatic factors during the growing season between spring and winter wheat were remarkable. The GSL of spring(winter) wheat decreased(increased) with an increase in average temperature during the growing season. In all wheat-planting regions, the GSL increased with the increasing of total precipitation and sunshine duration during the growing season. In particular, the sensitivity of GSL to precipitation for spring wheat was weaker than for winter wheat, while the sensitivity of GSL to sunshine duration for spring wheat was stronger than for winter wheat. Recognition of the spatiotemporal differentiation of phenological changes and their response to various climatic factors will provide scientific support for decision-making in agricultural production. | Yujie LIU Qiaomin CHEN Quansheng GE Junhu DAI | 2018 | Science China Earth Sciences2018，61，8： | 10 |
| 9 | Farming and forestry land use changes in China and their driving forces from 1900 to 1980显示文摘A variety of agricultural and forestry land use materials, especially those in the first half of 20th century, were collected. According to land use change in this period, the whole country is demarcated into seven regions, Northeast China, North China, Northwest and Loess Plateau, Southeast and Coastal Region, Southwest China, Qinghai-Tibetan Plateau, Inner Mongolia and Xinjiang, in proper order by using Cluster Analysis. The farming and forestry land use change in these regions were analyzed. The results show that the total cultivated land areas increased in this period, especially in the 1950s and 1960s the cultivated land area increased more significantly, but differed in different regions, and the most rapid increasing rate was 2.63 percent a year. On the other hand, the forestry land area was increasing in most parts of this period, especially after 1949. But in most regions, the decrease of forestry land area at the end of 1970s is also very obvious. It is regarded that the population increase, food production, natural disasters and some related government policies were among the main driving factors for farming and forestry land use change. | GE Quansheng DAI Junhu | 2005 | Science China Earth Sciences2005，48，10： | 10 |
| 10 | THE LOWER APPROXIMATION OF EIGENVALUE BY LUMPED MASS FINITE ELEMENT METHOD显示文摘In the present paper, we investigate properties of lumped mass finite element method (LFEM hereinafter) eigenvalues of elliptic problems. We propose an equivalent formulation of LFEM and prove that LFEM eigenvalues are smaller than the standard finite element method (SFEM hereinafter) eigenvalues. It is shown, for model eigenvalue problems with uniform meshes, that LFEM eigenvalues are not greater than exact solutions and that they are increasing functions of the number of elements of the triangulation, and numerical examples show that this result equally holds for general problems. | JunHu Yun-qingHuang HongmeiShen | 2004 | Journal of Computational Mathematics2004，22，4： | 10 |
| 11 | Analysis of stable components for extended-range (10-30 days) weather forecast:A case study of continuous overcast-rainy process in early 2009 over the mid-lower reaches of the Yangtze River显示文摘A continuous overcast-rainy weather(CORW) process occurred over the mid-lower reaches of the Yangtze River(MLRYR) in China from February 14 to March 9 in 2009,with a large stretch and long duration that was rarely seen in historical records.Using the empirical orthogonal function(EOF),we analyzed the geopotential height anomaly field of the NCEP-DOE Reanalysis II in the same period,and defined the stable components of extended-range(10-30 days) weather forecast(ERWF).Furthermore,we defined anomalous and climatic stable components based on the variation characteristics of the variance contribution ratio of EOF components.The climatic stable components were able to explain the impact of climatically averaged information on the ERWF,and the anomalous stable components revealed the abnormal characteristics of the continuous overcast-rainy days.Our results show that the stable components,especially the anomalous stable components,can maintain the stability for a longer time(more than 10 days) and manifest as monthly scale low-frequency variation and ultra-long-wave activities.They also behave as ultra-long waves of planetary scale with a stable and vertically coherent structure,reflect the variation of general circulation in mid-high latitudes,display the cycle of the zonal circulation and the movement and adjustment of the ultra-long waves,and are closely linked to the surface CORW process. | FENG GuoLin SUN ShuPeng ZHAO JunHu ZHENG ZhiHai | 2013 | Science China Earth Sciences2013，56，9： | 8 |
| 12 | Effects of fumaric acid supplementation on methane production and rumen fermentation in goats fed diets varying in forage and concentrate particle size显示文摘Background: In rumen fermentation, fumaric acid(FA) could competitively utilize hydrogen with methanogenesis to enhance propionate production and suppress methane emission, but both effects were diet-dependent. This study aimed to explore the effects of FA supplementation on methanogenesis and rumen fermentation in goats fed diets varying in forage and concentrate particle size.Methods: Four rumen-cannulated goats were used in a 4 × 4 Latin square design with a 2 × 2 factorial arrangement of treatments: low or high ratio of forage particle size: concentrate particle size(Fps:Cps), without or with FA supplementation(24 g/d). Fps:Cps was higher in the diet with chopped alfalfa hay plus ground corn than in that with ground alfalfa hay plus crushed corn.Results: Both increasing dietary Fps:Cps and FA supplementation shifted ruminal volatile fatty acid(VFA) patterns toward more propionate and less acetate in goats. An interaction between dietary Fps:Cps and FA supplementation was observed for the ratio of acetate to propionate(A:P), which was more predominant when FA was supplemented in the low-Fps:Cps diet. Methane production was reduced by FA, and the reduction was larger in the low-Fps:Cps diet(31.72%) than in the high-Fps:Cps diet(17.91%). Fumaric acid decreased ruminal total VFA concentration and increased ruminal p H. No difference was found in ruminal DM degradation of concentrate or alfalfa hay by dietary Fps:Cps or FA. Goats presented a lower ruminal methanogen abundance with FA supplementation and a higher B. fibrisolvens abundance with high dietary Fps:Cps.Conclusions: Adjusting dietary Fps:Cps is an alternative dietary model for studying diet-dependent effects without changing dietary chemical composition. Fumaric acid supplementation in the low-Fps:Cps diet showed greater responses in methane mitigation and propionate increase. | Zongjun Li Nannan Liu Yangchun Cao Chunjia Jin Fei Li Chuanjiang Cai Junhu Yao | 2018 | Journal of Animal Science and Biotechnology2018，9，2： | 8 |
| 13 | Phenological basis of determining tourism seasons for ornamental plants in central and eastern China显示文摘许多植物在特定的 phenophases 期间有高装饰的价值,并且与季节的植被风景高度种物候学相互关联。跨度的决心和为装饰植物的旅游季节的空间与时间的模式能自己向旅游主管和旅游者提供做旅行安排的一个理论基础。基于从三 phenophases 的 on-the-ground 观察导出的数据,首先明确地长叶叶着色日期的日期,完整的 flowering 日期,和结束,和在在中国的 12 个地点的相应气象学的数据,我们把旅游季节划分了成它的开始的日期,山峰(最好的日期)和为由计算这些 phenophases 的频率分布的装饰植物的结束日期。我们也决定了这个旅游季节的山峰怎么在过去的 50 年的功课期间变化了。我们发现了那:( 1 )旅游季节的山峰从3月16日 (在桂林)到5月5日(在哈尔滨)因为首先长叶,从4月3日(在 Kunming )到5月24日(在 Mudanjiang )为完整的 flowering ,并且从10月1日(在 Mudanjiang )到11月30日(在上海)为叶着色。当力量被期望,首先长叶和完整的 flowering 旅游季节的山峰断然与纬度被联系,当为叶着色它否定地与纬度被相关时。(2 ) 为首先长叶和完整的 flowering 的理想的旅游季节在北京和 Xian 在过去的 50 年到超过 0.16 天 / 年进展了,当为叶着色的旅游季节的山峰变得显著地推迟了时(到在北京的 0.16 天 / 年和在 Xian 的 0.21 天 / 年) 。(3 ) 旅游季节显著地越过相关 phenological 观察地点与温度被联系。首先长叶和完整的 flowering 的理想的时间决心分别地,与 pH 价值 increasi 每 1eposition 率增加到 4.02 天和 4.04 天前进了吗?? | TAO Zexing GE Quansheng WANG Huanjiong DAI Junhu | 2015 | Journal of Geographical Sciences2015，25，11： | 8 |
| 14 | Experimental Study on the Characteristics of CO_2 Hydrate Formation in Porous Media below Freezing Point显示文摘Porous medium has an obvious effect on the formation of carbon dioxide hydrate. In order to study the characteristics of CO2 hydrate formation in porous medium below the freezing point, the experiment of CO2 hydrate formation was conducted in a high-pressure 1.8-L cell in the presence of porous media with a particle size of 380 μm, 500 μm and 700 μm, respectively. The test results showed that the porous medium had an important influence on the process of CO2 hydrate formation below the freezing point. Compared with porous media with a particle size of 500 μm and 700 μm, respectively, the average hydrate formation rate and gas storage capacity of carbon dioxide hydrate in the porous medium with a particle size of 380 μm attained 0.016 14 mol/h and 65.094 L/L, respectively. The results also indicated that, within a certain range of particle sizes, the smaller the particle size of porous medium was, the larger the average hydrate formation rate and the gas storage capacity of CO2 hydrate during the process of hydrate formation would be. | Zhang Xuemin Li Jinping Wu Qingbai Wang Chunlong Nan Junhu | 2015 | China Petroleum Processing & Petrochemical Technology2015，17，3： | 8 |
| 15 | Global profiling of crotonylation on non-histone proteins显示文摘 | Weizhi Xu Junhu Wan Jun Zhan Xueying Li Huiying He Zhaomei Shi Hongquan Zhang | 2017 | Cell Research2017，27，7： | 7 |
| 16 | Dynamic-statistics combined forecast scheme based on the abrupt decadal change component of summer precipitation in East Asia显示文摘基于 19832011 CMAP 数据,在东亚的降水异例和它的附近的海区域(此后叫的东亚为短) 在 1999 前表明 ++ 模式并且 + 模式以后;这个十的变化在相应 EOF3 部件主要被包含。然而, NCC_CGCM 预报结果是相当不同的,它在 1999 前揭示 ++ 模式并且 ++ 模式以后。同时,基于这些关键 SST 区域改进 NCC_CGCMs 预报精确性的概率被讨论,并且动态统计的联合预报计划为增加在东亚在夏天降水包含的十的变化的信息被构造。独立样品预报结果显示这个预报计划罐头有效地修改十的变化信息在东亚在夏天降水包含了的 NCC_CGCMs (特别在 30 敢琠敨攠癮 的区域吗?? | GONG ZhiQiang ZHAO JunHu FENG GuoLin CHOU JiFan | 2015 | Science China Earth Sciences2015，58，3： | 7 |
| 17 | Reconstruction of Conceptual Prediction Model for the Three Rainfall Patterns in the summer of eastern China under global warming显示文摘With the influence of global warming,the global climate has undergone significant inter-decadal variation since the late 1970s.Although El Nio-Southern Oscillation(ENSO)has been the strongest signal for predicting global climate inter-annual variability,its relation with the summer rainfall in China has significantly changed,and its indicative function on the summer rainfall in China has weakened.This has led to a significant decrease in the accuracy rate of early conceptual prediction models for the Three Rainfall Patterns in the summer of eastern China.On the basis of the difference analysis of atmospheric circulation system configuration in summer,as well as the interaction of ocean and atmospheric in previous winter between two phases,i.e.before and after the significant global warming(1951 to 1978 and 1979 to 2012,respectively),we concluded that(1)Under different inter-decadal backgrounds,the atmospheric circulations that impacted the Three Rainfall Patterns in the summer of eastern China showed consistency,but in the latter phase of the global warming,the Western Pacific Subtropical High(WPSH)was on the strong side,the position of which was in the south,and the blocking high in the Eurasia mid-high latitudes was active,while the polar vortex extended to the south,and meridional circulation intensified.This circulation background may have been conducive to the increase of the circulation frequency of Patterns II and III,and the decrease of the circulation frequency of Pattern I,thus leading to more Patterns II and III and fewer Pattern I in the summer rainfall of eastern China.(2)In the former phase,the corresponding previous winter SST fields of different rainfall patterns showed visible differences.The impact of ENSO on North Pacific Oscillation(NPO)was great,and the identification ability of which on Patterns I and II of summer rainfall was effective.In the latter phase,this identification ability decreased,while the impact of ENSO on the Pacific/North American(PNA)teleconnection pattern increased,and the identification ability of the PNA on Patterns II and III also increased.Based on the new inter-decadal climate background,this study reconstructs the conceptual prediction model for the Three Rainfall Patterns in summer of eastern China by using the previous winter PNA and the Eurasian(EU)teleconnection indexes.The fitting effect was satisfying,though it is necessary to be further tested. | ZHAO JunHu FENG GuoLin | 2014 | Science China Earth Sciences2014，57，12： | 7 |
| 18 | Rumen microbiome structure and metabolites activity in dairy cows with clinical and subclinical mastitis显示文摘Background:Due to the high prevalence and complex etiology,bovine mastitis(BM)is one of the most important diseases to compromise dairy cow health and milk quality.The shift in milk compositions has been widely investigated during mastitis,but recent studies suggested that gastrointestinal microorganism also has a crucial effect on the inflammation of other peripheral tissues and organs,including the mammary gland.However,research focused on the variation of rumen inner-environment during mastitis is still limited.Therefore,the ruminal microbial profiles,metabolites,and milk compositions in cows with different udder health conditions were compared in the present study.Furthermore,the correlations between udder health status and ruminal conditions were investigated.Based on the somatic cell counts(SCC),California mastitis test(CMT)parameters and clinical symptoms of mastitis,60 lactating Holstein dairy cows with similar body conditions(excepted for the udder health condition)were randomly divided into 3 groups(n=20 per group)including the healthy(H)group,the subclinical mastitis(SM)group and the clinical mastitis(CM)group.Lactation performance and rumen fermentation parameters were recorded.And rumen microbiota and metabolites were also analyzed via 16S rRNA amplicon sequencing and untargeted metabolomics,respectively.Results:As the degree of mastitis increased,rumen lactic acid(LA)(P<0.01),acetate,propionate,butyrate,valerate(P<0.001),and total volatile fatty acids(TVFAs)(P<0.01)concentrations were significantly decreased.In the rumen of CM cows,the significantly increased bacteria related to intestinal and oral inflammation,such as Lachnospiraceae(FDR-adjusted P=0.039),Moraxella(FDR-adjusted P=0.011)and Neisseriaceae(FDR-adjusted P=0.036),etc.,were accompanied by a significant increase in 12-oxo-20-dihydroxy-leukotriene B4(FDR-adjusted P=5.97×10^(−9))and 10beta-hydroxy-6beta-isobutyrylfuranoeremophilane(FDR-adjusted P=3.88×10^(−10)).Meanwhile,in the rumen of SM cows,the Ruminiclostridium_9(FDR-adjusted P=0.042)and Enterorhabdus(FDR-adjusted P=0.043)were increased along with increasing methenamine(FDR-adjusted P=6.95×10^(−6)),5-hydroxymethyl-2-furancarboxaldehyde(5-HMF)(FDR-adjusted P=2.02×10^(−6))and 6-methoxymellein(FDR-adjusted P=2.57×10^(−5)).The short-chain fatty acids(SCFAs)-producing bacteria and probiotics in rumen,including Prevoterotoella_1(FDRadjusted P=0.045)and Bifidobacterium(FDR-adjusted P=0.035),etc.,were significantly reduced,with decreasing 2-phenylbutyric acid(2-PBA)(FDR-adjusted P=4.37×10^(−6)).Conclusion:The results indicated that there was a significant shift in the ruminal microflora and metabolites associated with inflammation and immune responses during CM.Moreover,in the rumen of cows affected by SM,the relative abundance of several opportunistic pathogens and the level of metabolites which could produce antibacterial compounds or had a competitive inhibitory effect were all increased. | Yue Wang Xuemei Nan Yiguang Zhao Linshu Jiang Mengling Wang Hui Wang Fan Zhang Fuguang Xue Dengke Hua Jun Liu Junhu Yao Benhai Xiong | 2021 | Journal of Animal Science and Biotechnology2021，12，3： | 6 |
| 19 | LES investigation of swirl intensity effect on unconfined turbulent swirling premixed flame显示文摘A finite reaction rate model is presented as a closure of large eddy simulation(LES) to numerically study an open premixed methane/air swirling flame. The resultant model is firstly validated by comparing with reported data and then employed to investigate the effect of swirling intensity on flow field, flame characteristics and combustion instability of the swirling flame. Three different swirl numbers are considered. The LES results show that as swirling intensity increases, the vortex entrainment and micro-mixing are enhanced, leading to more lean equivalent ratios at flame front; consequently, higher swirling number causes lower flame temperatures and slower CO oxidization; for all simulated swirl numbers,flame fronts are completely located out of the recirculation zones and anchored at the inner surface of the annular swirling steams; swirl number has a crucial effect on swirling flame extension toward radial and tangential dimensions and then significantly affects streamwise flame length, which is a great influencing factor on combustion instability; vortex-induced disturbance on flame in streamwise plays a critical role in combustion instability. | Zhihua Wang Yanwei Xu Yu L Zhijun Zhou Junhu Zhou Kefa Cen | 2014 | Chinese Science Bulletin2014，59，33： | 6 |
| 20 | Variation in vegetation greenness in spring across eastern China during 1982-2006显示文摘Vegetation greenness is a key indicator of terrestrial vegetation activity. To under-stand the variation in vegetation activity in spring across eastern China (EC), we analysed the variation in the Normalised Difference Vegetation Index (NDVI) from April to May during 1982-2006. The regional mean NDVI across EC increased at the rate of 0.02/10yr (r2=0.28; p=0.024) prior to 1998; the increase ceased, and the NDVI dropped to a low level thereafter. However, the processes of variation in the NDVI were different from one region to another. In the North China Plain, a cultivated area, the NDVI increased (0.03/10yr; r2=0.52; p<0.001) from 1982 to 2006. In contrast, the NDVI decreased (-0.02/10yr; r2=0.24; p=0.014) consecu-tively from 1982 to 2006 in the Yangtze River and Pearl River deltas, two regions of rapid urbanisation. In the eastern region of the Inner Mongolian Plateau and the lower reaches of the Yangtze River in East China, the NDVI increased prior to 1998 and decreased thereafter. In the Hulun Buir area and the southern part of the Yangtze River Basin, the NDVI increased prior to 1998 and remained static thereafter. The NDVI in the grasslands and croplands in the semi-humid and semi-arid areas showed a significant positive correlation with precipitation, while the NDVI in the woodlands in the humid to semi-humid areas showed a significant positive correlation with temperature. As much as 60% of the variation in the NDVI was ex-plained by either precipitation or temperature. | ZHANG Xuezhen DAI Junhu GE Quansheng | 2013 | Journal of Geographical Sciences2013，23，1： | 6 |
您所在的机构暂未开通此部分的功能，请联系管理员