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1Seasonal variations and sources of mass and chemical composition for PM_(10) aerosol in Hangzhou,China显示文摘Aerosol observation was conducted for four seasons from September 2001 to August 2002 at five sampling sites in Hangzhou, South China, on PM10 mass, 22 elements (Na, Mg, Al, Si, P, S, K, Ca, Ti, V, Cr, Mn, Fe, Ni, Cu, Zn, As, Se, Br, Cd, Ba, and Pb), 5 major ions (F-, Cl-, NO3-, SO42-, and NH4+), and organic and elemental carbon (OC and EC), showing that PM10 mass ranged from 46.7 to 270.8 g/m3, with an annual average of 119.2 g/m3. Na, Al, Si, S, K, Ca, and Fe were the most abundant elements in PM10, most of S being in the form of SO42-. SO42-, NO3-, and NH4+ were the major ions, which contributed to about 20% of the PM10 mass. The mean seasonal concentrations for SO42-, averaged over all sites, were found to be 18.0, 18.5, 24.7, and 21.4 g/m3, for spring, summer, autumn, and winter, respectively, while the corresponding loadings for NO3- were 7.2, 4.7, 7.1, and 11.2 g/m3, and for NH4+ were 6.0, 5.9, 8.2, and 9.3 g/m3, in the form mostly of NH4NO3 in spring, autumn, and winter, and mostly of (NH4)2SO4 in summer. The low NO3-/SO42-ratio found indicates coal combustion as the major source throughout the year. The mean annual concentrations of OC and EC in PM10 were found to be 21.4, and 4.1 g/m3, respectively. Material balance calculation indicated that fugitive dust, the secondary aerosol, and carbonaceous matter were the most abundant species in PM10 for the four seasons, as is characteristic for cities in South China.Junji Cao Zhenxing Shen Judith C. Chow Guowei Qi John G. Watson 2009Particuology2009,7,3:58
2Spatial and temporal variation of particulate matter and gaseous pollutants in 26 cities in China显示文摘O3and PM2.5were introduced into the newly revised air quality standard system in February 2012, representing a milestone in the history of air pollution control, and China's urban air quality will be evaluated using six factors(SO2, NO2, O3, CO, PM2.5and PM10) from the beginning of 2013. To achieve the new air quality standard, it is extremely important to have a primary understanding of the current pollution status in various cities. The spatial and temporal variations of the air pollutants were investigated in 26 pilot cities in China from August 2011 to February 2012, just before the new standard was executed. Hourly averaged SO2, NO2and PM10were observed in 26 cities, and the pollutants O3, CO and PM2.5were measured in 15 of the 26 cities. The concentrations of SO2and CO were much higher in the cities in north China than those in the south. As for O3and NO2, however, there was no significant diference between northern and southern cities. Fine particles were found to account for a large proportion of airborne particles, with the ratio of PM2.5to PM10ranging from 55% to 77%. The concentrations of PM2.5(57.5 μg/m3) and PM10(91.2 μg/m3) were much higher than the values(PM2.5: 11.2 μg/m3; PM10 : 35.6 μg/m3) recommended by the World Health Organization. The attainment of the new urban air quality standard in the investigated cities is decreased by 20% in comparison with the older standard without considering O3, CO and PM2.5, suggesting a great challenge in urban air quality improvement, and more eforts will to be taken to control air pollution in China.Fahe Chai Jian Gao Zhenxing Chen Shulan Wang Yuechong Zhang Jingqiao Zhang Hefeng Zhang Yaru Yun Chun Ren 2014Journal of Environmental Sciences2014,26,1:36
3Exotic origin of the Chinese continental shelf: new insights into the tectonic evolution of the western Pacific and eastern China since the Mesozoic显示文摘The effect of paleo-Pacific subduction on the geological evolution of the western Pacific and continental China is likely complex. Nevertheless, our analysis of the distribution of Mesozoic granitoids in the eastern continental China in space and time has led us to an interesting conclusion: The basement of the continental shelf beneath East and South China Seas may actually be of exotic origin geologically unrelated to the continental lithosphere of eastern China. By accepting the notion that the Jurassic–Cretaceous granitoids in the region are genetically associated with western Pacific subduction and the concept that subduction may cease to continue only if the trench is being jammed, then the termination of the granitoidmagmatism throughout the vast region at *88 ± 2 Ma manifests the likelihood of ‘‘sudden'', or shortly beforehand(*100 Ma), trench jam of the Mesozoic western Pacific subduction. Trench jam happens if the incoming‘‘plate'' or portion of the plate contains a sizeable mass that is too buoyant to subduct. The best candidate for such a buoyant and unsubductable mass is either an oceanic plateau or a micro-continent. We hypothesize that the basement of the Chinese continental shelf represents such an exotic, buoyant and unsubductable mass, rather than seaward extension of the continental lithosphere of eastern China. The locus of the jammed trench(i.e., the suture) is predictably located on the shelf in the vicinity of, and parallel to, the arc-curved coastal line of the southeast continental China. It is not straightforward to locate the locus in the northern section of the East China Sea shelf because of the more recent(\20 Ma) tectonic re-organization associated with the opening of the Sea of Japan. We predict that the trench jam at *100 Ma led to the re-orientation of the Pacific plate motion in the course of NNW direction as inferred from the age-progressive Emperor Seamount Chain of Hawaiian hotspot origin(its oldest unsubdued Meiji and Detroit seamounts are *82 Ma),making the boundary between the Pacific plate and the newly accreted plate of eastern Asia a transform fault at the location east of the continental shelf of exotic origin. This explains the apparent *40 Myr magmatic gap from *88to *50 Ma prior to present-day western Pacific subduction initiation. We propose that basement penetration drilling on well-chosen sites is needed to test the hypothesis in order to reveal the true nature of the Chinese continental shelf basement. This testing becomes critical and cannot longer be neglected in order to genuinely understand the tectonic evolution of the western Pacific and its effect on the geology of eastern China since the Mesozoic, includingthe cratonic lithosphere thinning, related magmatism/mineralization, and the mechanism of the subsequent South China Sea opening, while also offering novel perspectives on aspects of the plate tectonics theory. We also suggest the importance of future plate tectonic reconstruction of the western Pacific to consider the nature and histories of the Chinese continental shelf of exotic origin as well as the probable transform plate boundary from *100 to*50 Ma. Effort is needed to reveal the true nature and origin of the *88 ± 2 Ma granitic gneisses in Taiwan and the 110–88 Ma granitoids on the Hainan Island.Yaoling Niu Yi Liu Qiqi Xue Fengli Shao Shuo Chen Meng Duan Pengyuan Guo Hongmei Gong Yan Hu Zhenxing Hu Juanjuan Kong Jiyong Li Jinju Liu Pu Sun Wenli Sun Lei Ye Yuanyuan Xiao Yu Zhang 2015Science Bulletin2015,60,18:32
4Prediction of high-speed train induced ground vibration based on train-track-ground system model显示文摘The development of analysis on train-induced ground vibration is briefly summarized. A train-track-ground integrated dynamic model is introduced in the paper to predict the ground vibration induced by high-speed trains. Representative dynamic responses of the train-track-ground system predicted by the model are presented. Some major results measured from two field tests on the ground vibration induced by two high-speed trains are reported. Numerical prediction with the proposed train-track-ground model is validated by the high-speed train running experiments. Research results show that the wheel/rail dynamic interaction caused by track irregularities has a significant influence on the ground acceleration and little influence on the ground displacement. The main frequencies of the ground vibration induced by high-speed trains are usually below 80 Hz. Compared with the ballasted track, the ballastless track structure can produce much larger train-induced ground vibration at frequencies above 40 Hz. The vertical ground vibration is much larger than the lateral and longitudinal components.Zhai Wanming He Zhenxing Song Xiaolin 2010Earthquake Engineering and Engineering Vibration2010,9,4:24
5Chemical characteristics of PM_(2.5) during dust storms and air pollution events in Chengdu,China显示文摘每天好的微粒(PM2.5 ) 样品从 2009 年 4 月在 Chengdu 被收集到 2010 年 2 月在灰尘暴风雨(决策支持系统) 和污染事件的几种类型期间调查他们的化学侧面,包括薄雾(HD ) ,燃烧的生物资源(BB ) ,和焰火显示(FD ) 。最高的 PM2.5 集体集中在决策支持系统(283.3 g/m3 ) 期间被发现,列在后面由 FD (212.7 g/m3 ) , HD (187.3 g/m3 ) ,和 BB (130.1 g/m3 ) 。大多数元素的集中在决策支持系统和污染事件期间被提高,除了 BB。第二等的无机的离子(NO3, SO42,和 NH4+) 在 HD 期间被充实,当从 BB 的 PM2.5 显示出高 K+ 时但是低 SO42。FD 在 SO42 在 K+ 和丰富引起了增加。Ca2+ 充满 DS 样品。离子平衡计算从 HD 显示了那 PM2.5, FD 比在正常的天更酸,但是 DS 和 BB 粒子是碱的。最高器官的碳(OC ) 集中在 FD 期间是 26.1 g/m3,列在后面由 BB (23.6 g/m3 ) , HD (19.6 g/m3 ) ,和决策支持系统(18.8 g/m3 ) 。相反,元素的碳(EC ) 集中比在 BB (6.2 g/m3 ) 和决策支持系统(6.0 g/m3 ) 期间在 HD (10.6 g/m3 ) 和 FD (9.5 g/m3 ) 期间是更丰富的。最高的 OC/EC 比率在 BB 期间被获得,与在 HD 期间最低。SO42/K+ 和 TCA/SO42 比率证明了是为区分污染事件的有效指示物。集体平衡证明那有机物, SO42,和 NO3 在污染事件期间是主导的化学部件,当土壤灰尘在决策支持系统期间是主导的时。Qiyuan Wang Junji Cao Zhenxing Shen JunTao Shun Xiao Lei Luo Qingyang He Xinying Tang 2013Particuology2013,11,1:23
6Generation of arbitrary vector vortex beams on hybrid-order Poincaré sphere显示文摘We propose theoretically and verify experimentally a method of combining a q-plate and a spiral phase plate to generate arbitrary vector vortex beams on a hybrid-order Poincaré sphere. We demonstrate that a vector vortex beam can be decomposed into a vector beam and a vortex, whereby the generation can be realized by sequentially using a q-plate and a spiral phase plate. The generated vector beam, vortex, and vector vortex beam are verified and show good agreement with the prediction. Another advantage that should be pointed out is that the spiral phase plate and q-plate are both fabricated on silica substrates, suggesting the potential possibility to integrate the two structures on a single plate. Based on a compact method of transmissive-type transformation, our scheme may have potential applications in future integrated optical devices.Zhenxing Liu Yuanyuan Liu Yougang Ke Yachao Liu Weixing Shu Hailu Luo Shuangchun Wen 2017Photonics Research2017,5,1:18
7Prevalence of physical fitness in Chinese school-aged children: Findings from the 2016 Physical Activity and Fitness in China -The Youth Study显示文摘Purpose: This study was to present the 2016 prevalence estimates of Chinese school-aged children meeting physical fitness standards and to examine differences by sex and residence locales in children who did not meet fitness standards.Methods: We conducted cross-sectional analyses of 171,991 children and adolescents(boy: 50.0%, Grades 1–12) who participated in the 2016 Physical Activity and Fitness in China—The Youth Study. The main outcomes were fitness measures, assessed by the 2014 revised Chinese National Student Physical Fitness Standard(CNSPFS), covering areas of aerobic capacity, upper body strength, flexibility, body mass index,abdominal strength, and trunk strength. Children's overall physical fitness performance was categorized, per CNSPFS standards, as excellent,good, pass, or no pass. Data on the prevalence of physical fitness categories and not meeting fitness standards(i.e., among children who received a 'no pass' mark) were analyzed, through logistic regression, by sex(boy, girl) and residence locales(urban, rural) across 3 school grades(primary,junior middle, and junior high).Results: In 2016, 5.95% of Chinese children and adolescents achieved an 'excellent' mark, 25.80% received a 'good' rating, 59.90% received a 'pass', and 8.35% received a 'no pass'. Overall, boys were more likely to not pass the fitness standards compared with girls(adjusted odds ratio(a OR) = 1.710; 95% confidence interval(CI): 1.708–1.712) and children living in urban areas were more likely to not pass the standards than those living in rural areas(a OR = 1.298; 95%CI: 1.296–1.299). Consistent patterns of not meeting fitness standards were also found by sex and residence locales across all 3 school grades.Conclusion: In the Chinese school-aged population, about 3 in 10 children achieved an 'excellent' or 'good' fitness standard in 2016, and about8% of this population did not meet CNSPFS standards. Children living in urban areas were more likely to not meet minimum fitness performance levels, and boys in school were more likely to not meet minimum fitness performance levels than girls.Zheng Zhu Yang Yang Zhenxing Kong Yimin Zhang Jie Zhuang 2017Journal of Sport and Health Science2017,6,4:16
8Nutritional composition and antioxidant activity of twenty mung bean cultivars in China显示文摘Interest in mung bean(Vigna radiata L.) as a functional food is growing; however, studies on the nutritional composition of major mung bean cultivars planted in China are limited.Twenty Chinese mung bean cultivars were collected and their nutritional compositions including starch, fat, protein, and phytochemicals were analyzed. The cultivars were found to have a high amount of resistant starch, accounting for 16.1%–22.3% of total starch, and balanced amino acid constitutions. Palmitic acid and linoleic acid were the two dominant fatty acids, accounting for respectively 32.4% and 36.1% of all of the assayed fatty acids. Four bound phenolic acids(syringic, caffeic, p-coumaric, and ferulic acids) and two free phenolic acids(caffeic and ferulic acids) were identified by HPLC. The antioxidant activity of 70%ethanol extracts from the 20 mung bean cultivars was evaluated. Their DPPH and ABTS+free-radical-scavenging capacity ranged from 28.13 ± 2.24 to 35.68 ± 0.71 μmol g-1and from3.82 ± 0.25 to 13.44 ± 1.76 μmol g-1, respectively. Significant positive correlations of ABTS+free-radical-scavenging capacity with total phenolic acids and total flavonoid contents were observed. These results suggest that Chinese mung bean cultivars are rich in balanced nutrients and that their phytochemicals should be considered as potential sources of natural antioxidants.Zhenxing Shi Yang Yao Yingying Zhu Guixing Ren 2016The Crop Journal2016,4,5:16
9Land cover change along the Qinghai-Tibet Highway and Railway from 1981 to 2001显示文摘Based on the NOAA AVHRR-NDVI monthly data from 1981 to 2001, the spatial distribution and dynamic change of land cover along the Qinghai-Tibet Highway and Railway were studied. The results of the analytical data indicate that the NDVI values in July, August and September are rather high during a year, and a linear trend by calculating NDVI of each pixel computed based on the average values of NDVI in July, August and September were obtained. The results are as follows: 1) Land cover of the study area by NDVI displays high at two sides of the area and low in the center, and agriculture area > alpine meadow > alpine grassland > desert grassland. 2) In the study area, the amount of pixels with high increase, slight increase, no change, slight decrease and high decrease account for 0.29%, 14.86%, 67.61%, 16.7% and 0.57% of the whole area, respectively. The increase of land cover pixels is mainly in the agriculture and alpine meadow and the decrease pixels mainly in the alpine grassland, desert grassland and hungriness. Grassland and hungriness contribute to the decrease mostly and artificial land and meadow contribute to the increase mostly. 3) In the area where human beings live, the changing trend is obvious, such as the valleys of Lhasa River and Huangshui River and area along the Yellow River; in the high altitude area with fewer people living, the changing trend is relatively low, like the area of Hoh Xil. 4) Human being’s behaviors are a key factor followed by the climate changes affecting land cover.DING Mingkun ZHANG Yili SHEN Zhenx LIU Linshan ZHANG Wei WANG Zhaofeng BAI Wanqi ZHENG Du 2006Journal of Geographical Sciences2006,16,4:15
10Photochemical pollution in Lanzhou, China - A case study显示文摘The photochemical air pollution in Xigu district of Lanshou city, Gansu Province was studied during a period of 1981-1984. The extremely high NMHC/NOx ratio and ozone level elevation after rain have been noticed. A series of outdoor and indoor reaction chamber simulation experiments conducted in order to understand the specific conditions. The ozone formation under NMHC/NOx condition and the possible reason for high ozone concentration after rain are discussed.Tang Xiaoyan , Li Jinglong, Dong ZhenXing, Wang Yuying,Wang Wenxing , Qi Liwen, Liu Xiling, Zhang Yutian, Zhang Xuejin,Tian Bingshen, Jin Suwen , Yang Lingqing and Zhang Yixin Department of Technical Physics,Peking University, Beijing, China. Chinese Reaearch Academy of Eavironmental Sciences, Beijing,China. Gansu Provincial Environmental Research Institute, Lanshou, China. Lanshou Petrochemical Engineering Institute, Lanshou, China. 1989Journal of Environmental Sciences1989,1,1:15
11Real-time Simulation of Large Aircraft Flying Through Microburst Wind Field显示文摘为在飞行模拟器中高逼真度地模拟在扰动风场中的飞行,研究了大型飞机在起飞着陆阶段遭遇微下击暴流风切变的实时仿真。基于涡环和Rankine复合涡原理建立了参数化三维微下击暴流模型。通过涡环倾斜和多涡环叠加方法实现了各种复杂微下击暴流风场的模拟。基于Boeing747-100飞机建模数据,系统推导了含风切变影响的六自由度动力学模型,给出了扰动风下气动模型修正的一般方法。对该机遭遇微下击暴流时实施纵向和横侧改出分别进行了控制器设计与仿真。研究结果表明,建立的三维微下击暴流模型可扩展性强,可用于模拟实际复杂风场。含风切变影响的大型飞机动力学模型合理有效。针对飞机从不同位置穿越风场,可采用不同的改出策略。整个模型可应用于飞行模拟器的实时飞行仿真。Gao Zhenxing Gu Hongbin Liu Hui 2009Chinese Journal of Aeronautics2009,22,5:13
12Debromination of decabromodiphenyl ether by organo-montmorillonitesupported nanoscale zero-valent iron: Preparation, characterization and influence factors显示文摘An organo-montmorillonite-supported nanoscale zero-valent iron material(M-NZVI) was synthesized to degrade decabromodiphenyl ether(BDE-209). The results showed that nanoscale zero-valent iron had good dispersion on organo-montmorillonite and was present as a core-shell structure with a particle size range of nanoscale iron between 30–90 nm, characterized by XRD, SEM, TEM, XRF, ICP-AES, and XPS. The results of the degradation of BDE-209 by M-NZVI showed that the efficiency of M-NZVI in removing BDE-209 was much higher than that of NZVI. The efficiency of M-NZVI in removing BDE-209 decreased as the pH and the initial dissolved oxygen content of the reaction solution increased, but increased as the proportion of water in the reaction solution increased.Zhihua Pang Mengyue Yan Xiaoshan Jia Zhenxing Wang Jianyu Chen 2014Journal of Environmental Sciences2014,26,2:13
13Insights into sludge granulation during anaerobic treatment of high-strength leachate via a full-scale IC reactor with external circulation system显示文摘In this study, a full-scale internal circulation(IC) reactor coupled with an external circulation system was developed to treat high-strength leachate from a municipal solid waste(MSW)incineration plant, in which anaerobic sludge granulation was intensively investigated. Results showed that the IC reactor achieved excellent treatment performance under high organic loading rates(OLR) of 21.06–25.16 kg chemical oxygen demand(COD)/(m3? day). The COD removal efficiency and biogas yield respectively reached 89.4%–93.4% and 0.42–0.50 m3/kg COD.The formation of extracellular polymeric substances(EPS) was closely associated with sludge granulation. Protein was the dominant component in sludge EPS, and its content was remarkably increased from 21.6 to 99.7 mg/g Volatile Suspended Solid(VSS) during the reactor operation. The sludge Zeta potential and hydrophobicity positively correlated with the protein/polysaccharide ratio in EPS, and they were respectively increased from-26.2 m V and 30.35% to-10.6 m V and 78.67%, which was beneficial to microbial aggregation. Three-dimensional fluorescence spectroscopy(3 D-EEM) and Fourier transform infrared spectroscopy(FT-IR)analysis further indicated the importance of protein-like EPS substances in the sludge granulation. Moreover, it was also found that the secondary structures of EPS proteins varied during the reactor operation.Tao Wang Zhenxing Huang Wenquan Ruan Mingxing Zhao Youlian Shao Hengfeng Miao 2018Journal of Environmental Sciences2018,30,2:12
14DISTRIBUTION OF CARBONACEOUS AEROSOL DURING SPRING 2005 OVER THE HORQIN SANDLAND IN NORTHEASTERN CHINA显示文摘The objective of this study was to characterize the elemental carbon and organic carbon (EC and OC, respectively) content of aerosol particles (PM2.5) collected at Tongliao, a site in the Horqin Sandland of northeastern China. During spring 2005, the PM2.5 mass concentration was 126±71 μg?m-3, with higher dust concentrations during five dust storms than on non-dusty days (255±77 vs. 106±44 μg?m-3). The average OC and EC concentrations in PM2.5 de-termined by a thermal/optical reflectance method were 15.7±7.3 μg?m-3 and 3.3±1.7 μg?m-3, respectively, and carbona-ceous aerosol accounted for 9.9% of the PM2.5 mass during dust storms compared to 21.7% on normal days. The aver-age ratios of OC to EC during dust storms were similar to those on non-dusty days, and the correlation coefficient be-tween OC and EC was high, 0.86. The high OC/EC ratios, the distributions of eight carbon fractions, and the strong rela-tionship between K with OC and EC indicate that rural biomass burning was the dominant contributor to the regional carbonaceous aerosol.Xuxiang Li Zhenxing Shen Junji Cao Suixin Liu Chongshu Zhu Ting Zhang 2006China Particuology2006,4,6:10
15Alendronate loaded graphene oxide functionalized collagen sponge for the dual effects of osteogenesis and anti-osteoclastogenesis in osteoporotic rats显示文摘Graphene Oxide(GO)-related hydrogels have been extensively studied in hard tissue repair,because GO can not only enhance the mechanical properties of polymers but also promote osteogenic differentiation of mesenchymal stem cells.However,simple GO-related hydrogels are not ideal for the repair of osteoporotic bone defects as the overactive osteoclasts in osteoporosis.Alendronate(Aln)is known to inhibit osteoclasts and may bind to GO through covalent connection.Therefore,delivering Aln in GO-related hydrogels may be effective to repair osteoporotic bone defects.Here,we developed a control-released system which is constructed by collagen(Col)-GO sponges loaded with Aln(Col-GO-Aln)for osteoporotic bone defect repair.In vitro,Col-GO-Aln sponges prolonged the release period of Aln,and the sponge containing 0.05%(w/v)GO released Aln faster than sponge with 0.2%GO.Furthermore,tartrate-resistant acid phosphatase(TRAP)and F-actin staining demonstrated that Col-GO-Aln sponges effectively inhibited osteoclastogenesis of monocyte-macrophages.In vivo,micro-CT scan showed that the volume of newborn bone in defect site by 0.05%GO sponge was nearly three times larger than that of other groups.Moreover,the CT and histological examinations of rat femur proved that Col-GO-Aln sponges decreased the number of osteoclasts and suppressed the systemic bone loss in osteoporotic rats.These findings reveal that the application of GO as carriers of anti-osteoporosis drugs is a viable treatment for osteoporosis.The results also underscore the potential of GO-related hydrogels with Aln-releasing capacity for bone regeneration in osteoporosis.Yuyang Zeng Muran Zhou Lifeng Chen Huimin Fang Shaokai Liu Chuchao Zhou Jiaming Sun Zhenxing Wang 2020Bioactive Materials2020,5,4:10
16Hybrid PdAg alloy-Au nanorods: Controlled growth, optical properties and electrochemical catalysis显示文摘高质量的混合 nanostructures 的可控制的生长为层次、复杂、多功能的设备的制造是高度合乎需要的。这里, PdAg 合金在金 nanorods 上的不同地点是 controllably 成年的,生产有在金牌的结束的 PdAg 的像哑铃的 nanostructures 有种的 PdAg 的 nanorods 或分叉的 nanostructures 对金 nanorods 几乎垂直。金 nanorods 上的 PdAg 合金的成核地点能被改变 H2PdCl4, AgNO3 和 cetyltrimethylammonium 溴化物(CTAB ) 的集中有效地调节。像哑铃、分叉的 nanostructures 被传播描绘电子显微镜学(TEM ) ,高分辨率的 TEM (HRTEM ) ,扫描线的精力散的 X 光检查光谱学(版本) , X 光检查光电子光谱学(XPS ) 和紫外力的吸收光谱学。他们的 electrocatalytic 表演作为探查反应用乙醇氧化被评估。像哑铃的 nanostructures 比分叉的显示出更好毒害反的表演,而是一项更坏的电气化学的活动。结果为基本研究或潜在的应用为复杂 nanostructures 的控制生长提供指南。Qiao Zhang Xia Guo Zhenxing Liang Jianhuang Zeng Jian Yang Shijun Liao 2013Nano Research2013,6,8:10
17Molecular mapping of QTLs for root response to phosphorus deficiency at seedling stage in wheat (Triticum aestivum L.)显示文摘Phosphorus (P) deficiency in the soil is one of the major abiotic stresses that limit plant growth and crop productivity throughout the world. Development of cultivars with improved P-deficiency tolerance is an efficient strategy for sustainable agriculture. Plant roots play an important role in crop growth and development, especially in nutrient uptake and improvement of P-efficiency. Mapping quantitative trait loci (QTLs) for root traits and their response to low P stress at seedling stage will facilitate the development of P-efficient wheat cultivars. In this study, 30 QTLs (LOD>2.0) were mapped for the three root traits, such as root length, root number and root dry matter under different P supply conditions and their response to P-stress. These QTLs were distributed on 14 chromosomes, with each of the 5 QTLs explaining more than 10% phenotype variance. Analyses showed that root traits and their response to P-deficiency were controlled by different QTLs. In addition, alleles with positive effects were separated on both parents, and wheat cultivars with improved P-efficiency could be developed by accumulating these positive effect alleles together.Li Zhenxing Ni Zhongfu Peng Huiru Liu Zhiyong Nie Xiuling Xu Shengbao Liu Gang Sun Qixin 2007Progress in Natural Science:Materials International2007,17,10:8
18The relations between density of FACs in the Plasma Sheet Boundary Layers and Kp index显示文摘We have studied 172 field-aligned currents(FACs) cases observed by the ClusterII satellites when they crossed the plasma sheet boundary layer(PSBL) in the magnetotail from July to October 2001.We mainly analyzed the relationship between the characteristic of FACs at the PSBL in magnetotail and the Kp index.The main results indicated the followings:1) In the different geomagnetic activity levels,the relative occurrence of FACs in PSBL increased monotonically with geomagnetic activity.2) The density of FACs in PSBL increased monotonically with Kp index.In the storm main phase,the density of FACs increased dramatically,the maximum FACs approximately equaled 19.05 nA m 2 while Kp equaled 5.3) The variation of FACs density in PSBL was consistent with the variation of the Kp index.However,when AE<800 nT,FACs density in PSBL increased with increasing AE,and when AE>800 nT,it decreased with increasing AE.Therefore,our results suggested that the FACs density in PSBL had a closer correlation with Kp index.CHENG ZhengWei SHI JianKui ZHANG TieLong DUNLOP Malcolm LIU ZhenXing 2011Science China(Technological Sciences)2011,54,11:8
19Overview of Energy Storage in Renewable Energy Power Fluctuation Mitigation显示文摘The integration of renewable energy,such as PV and wind power,has exerted great impacts on the power system with its rapid development.If the corresponding energy storage system is configured,the power system could be able to hold a higher proportion of renewable energy.Focusing on energy storage application for the output fluctuation mitigation of renewable energy,this paper first analyses the reason for renewable energy power fluctuation mitigation from the four aspects of frequency,unit ramp,low frequency oscillation and cascading failure.In addition,the fluctuation rate standard of grid-connected renewable energy,the energy storage type and the mitigation topology are introduced.Then a summary and analysis on mitigation strategy and hybrid energy storage allocation strategy are presented.Finally,the demonstration application and development trend of energy storage are analyzed to provide reference for the promotion of energy storage in renewable energy.Yushu Sun Zhenxing Zhao Min Yang Dongqiang Jia Wei Pei Bin Xu 2020CSEE Journal of Power and Energy Systems2020,6,1:8
20Rupture process of the M_w7.9 Nepal earthquake April 25, 2015显示文摘On April 25,2015,a magnitude Mw7.9 earthquake occurred in the southern Himalaya,Nepal,at 14:11 local time(UTC2015-04-25 06:11).Its epicenter was at 28.147°N,84.708°E with a source depth of 15 km,as determined by the United States Geological Survey(USGS).The earthquake hazard and secondary disasters,including landslides and avalanches,resulted in serious damage to Nepal and surroundings(including Kathmandu and the northern Himalaya of China)and caused huge loss of life and considerable destruction of property.WANG WeiMin HAO JinLai HE JianKun YAO ZhenXing 2015Science China Earth Sciences2015,58,10:8
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