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Impacts of artificial cloud seeding on surface PM2.5 and PM10 scavenging in the Yangtze River Delta 认领 引用
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作者 Jiaxing Sun Yue Tao +5 位作者 Yele Sun Weiguo Liu Shuwen Zhao Yueqin Shi Jie Li Jiefan Yang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第8期184-196,共13页
Artificial cloud seeding,as a direct intervention to enhance precipitation and an indirect method to reduce the ground particulate matter(PM)concentrations,has gained increasing attention in recent years for its poten... Artificial cloud seeding,as a direct intervention to enhance precipitation and an indirect method to reduce the ground particulate matter(PM)concentrations,has gained increasing attention in recent years for its potential applications in improving air quality.Our analysis of PM observations in the north of Yangtze River Delta(Xuzhou and Suqian)during 2022-2023 showed that PM wet removal efficiency increases linearly with rainfall intensity above threshold values,while the scavenging efficiency of gaseous pollutants showed no precipitation-dependent.In an aircraft seeding experiment in Suqian during the 2023 Shanghai Expo,AgI-induced ice nucleation triggered deposition growth of ice crystals,releasing latent heat that strengthened local updrafts and promoted subsequent riming and melting.Post-seeding observations(3-hour period)observed precipitation rates of 0.1-0.3 mm/h with PM10 and PM2.5 reductions of 25%-29% and 10%-16%,respectively,despite low wind speed indicating seedinginfluenced precipitation improved PM scavenging.Model simulations combined with observational scavenging rates showed the domain-wide impacts over an area of~9000 km2 area and an enhanced rainfall of 90,000tons.However,PM reductions were modest(0.5 Pa/s)showed higher scavenging efficiencies with PM reductions of 1%over 900 km2,4%-5%over 100 km2,and >10% in localized areas(40 km2).These results highlight that targeted cloud seeding can improve the surface rainfall and PM wet deposition,with the effectiveness of the process driven by microphysical-dynamical feedbacks. 展开更多
关键词 Cloud seeding Precipitation Particulate matter Scavenging Weather research and forecasting model
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Effects of Cloud Seeding on Precipitation Based on Long-Term Numerical Simulations and Seasonal Case Analyses 认领 引用
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作者 Soo-Hwan MOON Yun-Kyu LIM +4 位作者 Sang-Keun SONG Seoung Soo LEE Chae-Yeon KANG Eun-A KO Ki-Ho CHANG 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2025年第11期2352-2364,共13页
This study quantitatively analyzes the effects of cloud seeding on precipitation and seasonal variations over the Boryeong Dam region,which has the lowest dam storage in South Korea,based on a one-year numerical simul... This study quantitatively analyzes the effects of cloud seeding on precipitation and seasonal variations over the Boryeong Dam region,which has the lowest dam storage in South Korea,based on a one-year numerical simulation for2021.The Morrison microphysics scheme in the WRF(Weather Research and Forecasting)model was modified to estimate differences in precipitation between simulations with seeding materials(Ag I and Ca Cl2;SEED)and without them(UNSD).The effect of cloud seeding on increasing precipitation or artificial rainfall(AR)between the two simulations was highest in August(average:0.21 mm;31%of the SEED-simulated monthly mean)and lowest in January(average:0.003 mm;30%).This large AR may be attributable to a combination of abundant moisture from the summer monsoon climate and enhanced cloud droplet growth resulting from cloud seeding.In the analysis of seasonal representative cases,cloud seeding demonstrated more pronounced effects in spring and summer,with mean 180-min accumulated AR values of 0.46 and 0.43 mm,respectively,within the study area.In the spring,where an actual flight experiment was conducted,the simulated mean180-min accumulated AR(1.41 mm)in the flight experiment area was close to the observed value(1.61 mm)for the same area.Additionally,cloud seeding promoted the hygroscopic growth of water vapor,thereby reducing the cloud water mixing ratio and increasing the rain water mixing ratio.Seasonal cross-sectional analysis further highlighted the impact of cloud seeding on changes in these two mixing ratios,with the most pronounced effects observed in spring and summer. 展开更多
关键词 cloud seeding modified Morrison scheme artificial rainfall cloud water mixing ratio Boryeong Dam WRF
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Four herbal microgreen species varied in optimal seeding densities and growing substrate for maximized shoot yield and mineral nutrients 认领 引用
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作者 Jacob Arthur Tongyin Li +3 位作者 Guihong Bi Shecoya White Abby Pennington Raju Bheemanahalli 《Technology in Horticulture》 2025年第1期57-66,共10页
The microgreen industry in North America has experienced continuous growth,with an increasing number of species,including vegetables,herbs,and grains,being produced as microgreens.Cultural practices significantly impa... The microgreen industry in North America has experienced continuous growth,with an increasing number of species,including vegetables,herbs,and grains,being produced as microgreens.Cultural practices significantly impact the productivity and nutrient composition of various microgreen species.The hypothesis of this study was that optimal cultural practices,including seeding density and substrate type in microgreen production,should be species dependent.This study investigated shoot growth,visual quality,and mineral nutrient compositions of four herbal microgreen species,including basil,chives,scallion,and shiso,in two experiments as affected by five seeding densities,including 75,150,225,300,and 375 g·m−2,when grown with a peatbased soilless substrate,and a hydroponic mat made from jute fibers.Microgreen fresh shoot weights generally increased with increasing seeding density,with scallion producing the highest fresh shoot weight at 375 g·m−2,whereas the 375 g·m−2seeding density increased fresh shoot weight compared with 75 to 225 g·m−2,but resulted in similar fresh shoot yield to 300 g·m−2in basil,chives,and shiso.Scallion and shiso microgreens produced higher fresh shoot weight when grown on peat-based substrate,while basil and chives produced higher fresh shoot weight on jute mat compared with peat in one or both experiments.Substrate type also altered mineral nutrient concentrations in tested microgreens with peat substrate increasing phosphorus(P),potassium(K),calcium(Ca),and sulfur(S),and jute mat increasing nitrogen(N)and magnesium(Mg)in one or more species. 展开更多
关键词 shoot yield microgreen industry herbal microgreens seeding density mineral nutrients growing substrate cultural practicesincluding microgreenscultural practices
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Effect of magnetic seeding agglomeration on flotation of fine minerals 认领 引用 被引量：6
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作者 YUE Tao WU Xi-qing DAI Liang 《Journal of Central South University》 SCIE EI CAS CSCD 2019年第1期75-87,共13页
Magnetic seeding agglomeration(MSA),i.e.,adding magnetic seeds and a low intensity pre-magnetization for fine agglomeration,was applied to the flotation of coal,pyrite and hematite ore slimes.Size analysis and flotati... Magnetic seeding agglomeration(MSA),i.e.,adding magnetic seeds and a low intensity pre-magnetization for fine agglomeration,was applied to the flotation of coal,pyrite and hematite ore slimes.Size analysis and flotation tests highlight that the MSA improved flotation recovery and kinetics of pyrite ore while causing some loss in selectivity,and in the presences of the polyacrylamide for coal and starch for hematite the agglomeration flotation was further strengthened due to the synergetic effect between the flocculants and magnetic seeds.Magnetism analyses and calculation confirmed the adsorption of magnetic seeds onto minerals,resulting in a decreased threshold magnetic field intensity for the MSA to happen.Then atomic force microscope(AFM)study found that there exists a long range force between magnetic seeds and minerals,which facilitates the adsorption of magnetic seeds on minerals.FTIR shows both the polyacrylamide and starch adsorbed onto minerals and magnetic seeds,thus acting as the bridging media between minerals and magnetic seeds,intensifying the agglomeration in flotation.Surface characterization of the MSA was understood by SEM imaging,and models of the MSA were proposed. 展开更多
关键词 magnetic seeds magnetic seeding agglomeration(MSA) magnetic seeding flotation(MSF) fine agglomeration fine flotation flocculation
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Effects of different mechanical direct seeding methods on grain yield and lodging resistance of early indica rice in South China 认领 引用 被引量：16
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作者 WANG Wen-xia DU Jie +6 位作者 ZHOU Yan-zhi ZENG Yong-jun TAN Xue-ming PAN Xiao-hua SHI Qing-hua WU Zi-ming ZENG Yan-hua 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2021年第5期1204-1215,共12页
Direct seeding of rice has become a main planting method due to the low labor input and high economic benefit in South China.Dry direct seeding(DDS)has been widely used for single-season rice planting establishment.Ho... Direct seeding of rice has become a main planting method due to the low labor input and high economic benefit in South China.Dry direct seeding(DDS)has been widely used for single-season rice planting establishment.However,few studies have examined the performance of early-season indica rice under mechanical dry direct seeding.A two-year field experiment was conducted with two indica rice cultivars(i.e.,Zhongjiazao 17 and Zhuliangyou 819)to study lodging characteristics and grain yield formation under DDS,flooded direct seeding(FDS)and wet direct seeding(WDS)patterns.The results showed that the annual grain yield in DDS was higher by 14.42–26.34%for cultivar ZLY819 and 6.64–24.58%for cultivar ZJZ17 than in WDS and FDS,respectively,and these increases were mainly attributed to the improvement of the panicles.The DDS pattern significantly increased the seedling emergence rate of early indica rice cultivars,and increased total dry weight and crop growth rate.Meanwhile,shorter basal internodes,better stem diameter and stem wall thickness and lower lodging index were found in DDS in contrast to FDS and WDS.In particular,DDS improved the stem lodging resistance.Our results suggested that the appropriate direct seeding method was beneficial for improving the grain yield and lodging resistance of early indica rice. 展开更多
关键词 mechanical dry direct seeding early indica rice grain yield lodging resistance South China
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Genotypic Differences in Growth and Physiological Responses to Transplanting and Direct Seeding Cultivation in Rice 认领 引用 被引量：20
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作者 CHEN Song CAI Sheng-guan +1 位作者 CHEN Xin ZHANG Guo-ping 《Rice science》 2009年第2期143-150,共8页
The field experiments were conducted to investigate the growth and physiological responses of six super hybrid rice combinations to two planting methods,transplanting(TP)and direct seeding(DS)during 2006-2007 and 2007... The field experiments were conducted to investigate the growth and physiological responses of six super hybrid rice combinations to two planting methods,transplanting(TP)and direct seeding(DS)during 2006-2007 and 2007-2008.The 1000-grain weight and number of tillers per plant at the early growth stage,the maximum quantum yield of PSII(Fv/Fm)and transpiration rate(Tr)were higher in DS plants than in TP ones,whereas the grain yield,number of panicles per square meter,seed setting rate,net photosynthetic rate(Po)and stomatal conductance were lower in DS plants.However,little difference was detected in number of grains per panicle,stem(shoot)and leaf weight between the combinations in the two planting methods.The responses of plant growth and physiological traits to planting method differed greatly among the six combinations.In both planting methods,Chouyou 58 and Yongyou 6 had the highest and lowest panicle biomass and Pn,respectively.The higher yield of Chunyou 58 was associated with more numbers of panicles per square meter and grains per panicle in both planting methods.The results indicate that lower grain yield in DS relative to TP is attributed to more excessive tillers at the early stage,lower leaf biomass and photosynthetic rate at the late stage. 展开更多
关键词 rice Oryza sativa direct seeding transplanting genotypic difference photosynthesis biomass
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Plastic-film-side seeding,as an alternative to traditional film mulching,improves yield stability and income in maize production in semi-arid regions 认领 引用 被引量：6
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作者 ZHANG Bing-chao HU Han +6 位作者 GUO Zheng-yu GONG Shuai SHEN Si LIAO Shu-hua WANG Xin ZHOU Shun-li ZHANG Zhong-dong 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2023年第4期1021-1034,共14页
Planting under plastic-film mulches is widely used in spring maize production in arid-cold regions for water conservation and warming the soil.To ameliorate the associated issues such as plastic-film residues and addi... Planting under plastic-film mulches is widely used in spring maize production in arid-cold regions for water conservation and warming the soil.To ameliorate the associated issues such as plastic-film residues and additional labor during the“seedling release”in spring maize production,we have developed a plastic-film-side seeding(PSS)technology with the supporting machinery.In the semi-arid regions of Northwest China,a 7-year trial demonstrated that PSS increased plant number per hectare by 6547 and maize yield by 1686 kg ha–1compared with the traditional method of seeding under plastic-film mulch(PM).Two-year experiments were conducted in two semi-arid regions to further understand the effects of PSS on three important aspects of production:(i)the moisture and temperature of soil,(ii)maize development,yield output,and water use efficiency(WUE),and(iii)the revenue and plastic-film residuals in comparison with that of flat planting(CK)and PM.Continuous monitoring of the soil status demonstrated that,compared with CK,the PSS treatment significantly increased the temperature and moisture of the 0–20 cm soil in the seeding row at the early stage of maize development,and it also promoted grain yield(at 884–1089 kg ha–1)and WUE,achieving a similar effect as the PM treatment.Economically,the labor inputs of PSS were equal to CK,whereas the PM cost an additional 960 CNY ha–1in labor for releasing the seedlings from below the film.Overall,the PSS system increased profits by 5.83%(547 CNY ha–1yr–1)and 8.16%(748 CNY ha–1yr–1)compared with CK and PM,respectively.Environmentally,PSS achieved a residual film recovery rate of nearly 100%and eliminated 96 to 130 kg ha–1of residual plastic-film in PM in 3–5 years of maize production.Collectively,these results show that PSS is an eco-friendly technique for improving yield stability and incomes for the sustainable production of maize in semi-arid regions. 展开更多
关键词 maize soil water content soil temperature yield plastic-film plastic-film-side seeding semi-arid region
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Grain yield and nitrogen use efficiency of an ultrashort-duration variety grown under different nitrogen and seeding rates in direct-seeded and double-season rice in Central China 认领 引用 被引量：6
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作者 WANG Xin-yu YANG Guo-dong +4 位作者 XU Le XIANG Hong-shun YANG Chen WANG Fei PENG Shao-bing 《Journal of Integrative Agriculture》 SCIE CAS CSCD 2023年第4期1009-1020,共12页
Nitrogen(N) and seeding rates are important factors affecting grain yield and N use efficiency(NUE) in directseeded rice. However, these factors have not been adequately investigated on direct-seeded and double-season... Nitrogen(N) and seeding rates are important factors affecting grain yield and N use efficiency(NUE) in directseeded rice. However, these factors have not been adequately investigated on direct-seeded and double-season rice(DDR) in Central China. The objective of this study was to evaluate the effects of various N and seeding rates on the grain yield and NUE of an ultrashort-duration variety grown under DDR. Field experiments were conducted in 2018 in Wuxue County and 2019 in Qichun County, Hubei Province, China with four N rates and three seeding rates.The results showed that the grain yield of the ultrashort-duration variety ranged from 6.32 to 8.23 t ha–1with a total growth duration of 85 to 97 days across all treatments with N application. Grain yield was increased significantly by N application in most cases, but seeding rate had an inconsistent effect on grain yield. Furthermore, the response of grain yield to the N rates was much higher than the response to seeding rates. The moderate N rates of 100–150 and 70–120 kg N ha–1in the early and late seasons, respectively, could fully express the yield potential of the ultrashort-duration variety grown under DDR. Remarkably higher N responses and agronomic NUE levels were achieved in the early-season rice compared with the late-season rice due to the difference in indigenous soil N supply capacity(INS) between the two seasons. Seasonal differences in INS and N response should be considered when crop management practices are optimized for achieving high grain yield and NUE in ultrashort-duration variety grown under DDR. 展开更多
关键词 direct-seeded and double-season rice grain yield nitrogen rate nitrogen use efficiency seeding rate
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Micro-seeding and soft template effects on the control of polymorph and morphology of HMX micro particles in solvent-antisolvent process 认领 引用 被引量：8
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作者 Sajjad Damiri Shahriar Namvar Hadi Panahi 《Defence Technology（防务技术）》 SCIE CAS CSCD 2017年第6期392-396,共5页
A seeding strategy was developed in the preparation of cyclotetramethylenetetranitramine(HMX)explosive micro-particles by solvent-antisolvent method, to control their polymorphs from dangerous gamma(y) type to the des... A seeding strategy was developed in the preparation of cyclotetramethylenetetranitramine(HMX)explosive micro-particles by solvent-antisolvent method, to control their polymorphs from dangerous gamma(y) type to the desired and standard beta(β) form with the size distribution of <10.0 μm, by using a low concentration of β-HMX fine particles as micro-seed in the antisolvent medium. All products were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), and dynamic light scattering particle size analyzer. In the next step, the effective factors on the sizes and morphologies of micro-particles in the presence and absence of two soft templates of poly(ethylene glycol)-400(PEG-400) polymer and coconut fatty acid diethanolamide(lauramide) surfactant were investigated. The results of experiments showed that using of water-soluble PEG-400 in the low antisolvent temperatures leads to the production of very spherical particles. Also non-ionic surfactant of lauramide, direct the crystal growth to needle-like structures. The advantages of this method are its capability for the simple production of β-HMX micro-particles in the large scale production process, with the various crystal structures and particles size distributions. 展开更多
关键词 Micro seeding Polymorph HMX Explosive Micro-particle Solvent-antisolvent process
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Tumour seeding after percutaneous cryoablation for hepatocellular carcinoma 认领 引用 被引量：5
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作者 Chun-Ping Wang Hong Wang +7 位作者 Jian-Hui Qu Yin-Ying Lu Wen-Lin Bai Zheng Dong Xu-Dong Gao Guang-Hua Rong Zhen Zeng Yong-Ping Yang 《World Journal of Gastroenterology》 SCIE CAS CSCD 2012年第45期6587-6596,共10页
AIM:To assess the rate and risk factors for tumour seeding in a large cohort of patients.METHODS:Over an 8-year period,1436 hepatocellular carcinoma(HCC) patients with 2423 tumour nodules underwent 3015 image-guided p... AIM:To assess the rate and risk factors for tumour seeding in a large cohort of patients.METHODS:Over an 8-year period,1436 hepatocellular carcinoma(HCC) patients with 2423 tumour nodules underwent 3015 image-guided percutaneous cryoablation sessions [1215 guided by ultrasonography and 221 by spiral computed tomography(CT)].Follow-up CT or magnetic resonance imaging was performed every 3 mo.The detailed clinical data were recorded to analyse the risk factors for seeding.RESULTS:The median follow-up time was 18(range 1-90) mo.Seeding was detected in 11 patients(0.76%) at 1-24(median 6.0) mo after cryoablation.Seeding occurred along the needle tract in 10 patients and at a distant location in 1 patient.Seeded tumours usually showed similar imaging and histopathological features to the primary HCCs.Univariate analyses identified subcapsular tumour location and direct subcapsular needle insertion as risk factors for seeding.Multivariate analysis showed that only direct subcapsular needle insertion was an independent risk factor for seeding(P = 0.017;odds ratio 2.57;95%CI:1.47-3.65).Seeding after cryoablation occurred earlier in patients with poorly differentiated HCC than those with well or moderately differentiated HCC [1.33 ± 0.577 mo vs 11.12 ± 6.896 mo;P = 0.042;95%CI:(-19.115)-(-0.468)].CONCLUSION:The risk of seeding after cryoablation for HCC is small.Direct puncture of subcapsular tumours should be avoided to minimise seeding. 展开更多
关键词 Cryoablation Hepatocellular carcinoma Tu-mour seeding Clinical feature Risk factor
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A Three-Dimensional Model of Transport and Diffusion of Seeding Agents within Stratus 认领 引用 被引量：12
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作者 余兴 戴进 +1 位作者 蒋维楣 樊鹏 《Advances in Atmospheric Sciences》 SCIE CAS 2000年第4期617-635,共19页
It is essential to learn the temporal and spatial concentration distributions and variations of seeding agents in cloud seeding of precipitation enhancement. A three-dimensional puff trajectory model incorporating a m... It is essential to learn the temporal and spatial concentration distributions and variations of seeding agents in cloud seeding of precipitation enhancement. A three-dimensional puff trajectory model incorporating a mesoscale nonhydrostatic model has been formulated, and is applied to simulating the transporting and diffusive characteristics of multiple line sources of seeding agents within super-cooled stratus. Several important factors are taken into consideration that affect the diffusion of seeding materials such as effects of topography and vertical wind shear, temporal and spatial variation of seeding parameters and wet deposition. The particles of seeding agents are assumed to be almost inert, they have no interaction with the particles of the cloud or precipitation except that they are washed out by precipitation. The model validity is demonstrated by the analyses and comparisons of model results, and checked by the sensitivity experiments of diffusive coefficients and atmospheric stratification. The advantage of this model includes not only its exact reflection of heterogeneity and unsteadiness of background fields, but also its good simulation of transport and diffusion of multiple line sources. The horizontal diffusion rate and the horizontal transport distance have been proposed that they usually were difficult to obtain in other models. In this simulation the horizontal diffusion rate is 0.82 m s(-1) for average of one hour, and the horizontal average transport distance reaches 65 km after 1 4 which are closely related to the background Fields. 展开更多
关键词 puff trajectory model transport and diffusion multiple line sources of seeding agents heterogeneity and unsteadiness diffusion rate and transport distance super-cooled stratus
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Needle track seeding:A real hazard after percutaneous radiofrequency ablation for colorectal liver metastasis 认领 引用 被引量：4
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作者 Shirley Yuk-Wah Liu Kit-Fai Lee Paul Bo-San Lai 《World Journal of Gastroenterology》 SCIE CAS 2009年第13期1653-1655,共3页
Neoplastic needle track seeding following percutaneous radiofrequency ablation(RFA)of secondary liver tumors is exceedingly rare.Reports on cutaneous tumor seeding after percutaneous RFA for colorectal liver metastasi... Neoplastic needle track seeding following percutaneous radiofrequency ablation(RFA)of secondary liver tumors is exceedingly rare.Reports on cutaneous tumor seeding after percutaneous RFA for colorectal liver metastasis are even rarer in the literature.Here we report a case of a 46-year-old female who developed an ulcerating skin lesion along the needle track of a previous percutaneous RFA site around 6 mo after the procedure.The previous RFA was performed by the LeVeen needle for a secondary liver tumor from a primary rectal cancer.The diagnosis of secondary skin metastasis was confirmed by fine needle aspiration cytology.The lesion was successfully treated with wide local excision.We believe that tumor seeding after percutaneous RFA in our patient was possibly related to its unfavorable subcapsular location and the use of an expansion-type needle.Hence,prophylactic ablation of the needle track should be performed whenever possible.Otherwise,alternative routes of tumor ablation such as laparoscopic or open RFA should be considered. 展开更多
关键词 Radiofrequency catheter ablation Needles Neoplasm seeding Liver neoplasms Skin neoplasms Neoplasm metastasis
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Scale-up of NaA zeolite membranes on α-Al_2O_3 hollow fibers by a secondary growth method with vacuum seeding 认领 引用 被引量：10
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作者 刘艳梅 王学瑞 +2 位作者 张玉亭 何勇 顾学红 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第7期1114-1122,共9页
NaA zeolite membranes were prepared by secondary growth method on the outer surface of α-Al2O3 hollow fiber supports. Vacuum seeding method was used for planting zeolite seeds on the support surfaces. Hydrothermal cr... NaA zeolite membranes were prepared by secondary growth method on the outer surface of α-Al2O3 hollow fiber supports. Vacuum seeding method was used for planting zeolite seeds on the support surfaces. Hydrothermal crystallization was then carried out in a synthesis solution with molar ratio of Al2O3：SiO2：Na2O：H2O = 1：2：2：120 at 100 ℃ for 4 h. Effects of seeding conditions on preparation of hollow fiber NaA zeolite membranes were extensively investigated. Moreover, hollow fiber membrane modules with packing membrane areas of ca. 0.1 and 0.2 m2 were fabricated to separate ethanol/water mixture. It is found that the thickness of seed layer is obviously affected by seed suspension concentration, coating time and vacuum degree. Close-packing seed layer is required to obtain high-quality membranes. The optimized seeding conditions （seed suspension mass concentration of 0.5%-0.7% coating time of 5 s and vacuum degree of 10 kPa） lead to dense NaA zeolite layer with a thickness of 6-8 gin. Typically, an as-synthesized hollow fiber NaA zeolite membrane exhibits good pervaporation performance with a permeation flux of 7.02 kg· m^- 2· h^- 1 and separation factor 〉 10000 for sepa- ration of 90%; （by mass） ethanol/water mixture at 75 ℃ High reproducibility has been achieved for batch-scale production of hollow fiber NaA zeolite membranes by the hydrothermal synthesis approach. 展开更多
关键词 JNaA zeolite membraneVacuum seeding methodHollow fiberPervaporation
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Field Experiment for the Effects of Rice Straw Returning and Seeding Pattern on Wheat Seedling Emergence and Grain Yield 认领 引用 被引量：4
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作者 张斯梅 顾克军 +6 位作者 樊平声 许博 张传辉 顾东祥 张恒敢 于建光 杨四军 《Agricultural Science & Technology》 CAS 2017年第12期2357-2361,2382,共5页
In order to study the effect of rice straw returning and seeding patterns on seedling emergence and grain yield, field experiment was conducted to investi- gate the effects of straw mechanized returning and different ... In order to study the effect of rice straw returning and seeding patterns on seedling emergence and grain yield, field experiment was conducted to investi- gate the effects of straw mechanized returning and different seeding patterns on e- mergence rate, emergence uniformity and yield traits of wheat after rice. The results were as follows： in rice straw removal treatments, the emergence rate of mechani- cal seeding in drill was lower than that of mechanical uniform planting and manual broadcast sowing, which were 51.84%, 90.89% and 88.87%, respectively; the emer- gence uniformity of manual broadcast sowing was inferior to mechanical seeding in drill and mechanical uniform planting, which were 0.49, 0.26 and 0.23, respectively. As for the treatments with rice straw returning to the field, the emergence rate and emergence uniformity all decreased in the three seeding patterns, of which mechan- ical seeding in drill dropped markedly with emergence rate decreased by 36.54%. The emergence rate and emergence uniformity affected grain yield by affecting pan- icle, grains per spike and 1 000-grain weight. The grain yield for the treatment with rice straw removal was 6 091.34 kg/hm2, while that with rice straw returning to field was 6 476.20 kg/hm2, and both were higher than the yields of the other two seed- ing patterns. Therefore, mechanical uniform planting was？recommended for its higher emergence rate, better emergence uniformity, which was conductive to increase grain yield in wheat after rice production with rice straw returning to field. 展开更多
关键词 Straw returning Seeding pattern Wheat after rice Seedling emergence Yield
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Calculation and prediction of divertor detachment via impurity seeding by using one-dimensional model 认领 引用 被引量：1
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作者 周文杰 刘晓菊 +5 位作者 邬潇河 李邦 石奇奇 樊皓尘 杨艳杰 李国强 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第8期370-379,共10页
Achieving the detachment of divertor can help to alleviate excessive heat load and sputtering problems on the target plates,thereby extending the lifetime of divertor components for fusion devices.In order to provide ... Achieving the detachment of divertor can help to alleviate excessive heat load and sputtering problems on the target plates,thereby extending the lifetime of divertor components for fusion devices.In order to provide a fast but relatively reliable prediction of plasma parameters along the flux tube for future device design,a one-dimensional(1D)modeling code for the operating point of impurity seeded detached divertor is developed based on Python language,which is a fluid model based on previous work(Plasma Phys.Control.Fusion 58045013(2016)).The experimental observation of the onset of divertor detachment by neon(Ne)and argon(Ar)seeding in EAST is well reproduced by using the 1D modeling code.The comparison between the 1D modeling and two-dimensional(2D)simulation by the SOLPS-ITER code for CFETR detachment operation with Ne and Ar seeding also shows that they are in good agreement.We also predict the radiative power loss and corresponding impurity concentration requirement for achieving divertor detachment via different impurity seeding under high heating power conditions in EAST and CFETR phase II by using the 1D model.Based on the predictions,the optimized parameter space for divertor detachment operation on EAST and CFETR is also determined.Such a simple but reliable 1D model can provide a reasonable parameter input for a detailed and accurate analysis by 2D or three-dimensional(3D)modeling tools through rapid parameter scanning. 展开更多
关键词 divertor detachment impurity seeding one-dimensional modeling
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Numerical Simulation of Seeding Extra-Area Effects of Precipitation Using a Three-Dimensional Mesoscale Model 认领 引用 被引量：3
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作者 ZHAO Zhen LEI Heng-Chi 《Atmospheric and Oceanic Science Letters》 2010年第1期19-24,共6页
The Fifth-Generation NCAR/Penn State Mesoscale Model(MM5)has been used to investigate the extra-area effects of silver iodide(AgI)seeding on stratiform clouds performed at the supercooled layer.A bulk two-moment micro... The Fifth-Generation NCAR/Penn State Mesoscale Model(MM5)has been used to investigate the extra-area effects of silver iodide(AgI)seeding on stratiform clouds performed at the supercooled layer.A bulk two-moment microphysical scheme and the new software package for silver iodide are incorporated in MM5.Extra conservation equations are applied to trace the seeding agent,which is transported along the flow field and interacts with the supercooled cloud fields.In this study,the model was run using three nested grids,with 3.3 km×3.3 km horizontal resolution in the finest grid.The model results showed that seeding with AgI at the 5 to 15℃levels had microphysical effects on the simulated clouds and that the simulation produced a longer-lasting seeding effect because of the transport of the seeding agent by upper-level winds.Most of the AgI particles acted as deposition nuclei,and the deposition nucleation process contributed mostly to additional cloud ice formation in this study.The results showed that more precipitation results from seeded than unseeded case,and the precipitation was redistributed downwind of the target.Augmented precipitation(varying from 5%to 25%downwind)was confined in space to within 250 km of the seeding target and in time to the 3-h period after initial seeding. 展开更多
关键词 cloud seeding extra-area effects silver iodide MM5
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Effect of Fulvic Acid on Growth and Yield Components of Direct Seeding Rice 认领 引用 被引量：5
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作者 王晓琳 苏云 +1 位作者 许晓明 李贵 《Agricultural Science & Technology》 CAS 2013年第7期966-972,共7页
ObjectiveThis study aimed to investigate the effect of fulvic acid on the growth and yield components of direct seeding rice （Nanjing 44）. MethodThe rice seeds were soaked in 0 （water as a control）, 1, 2, 4 and 6 ... ObjectiveThis study aimed to investigate the effect of fulvic acid on the growth and yield components of direct seeding rice （Nanjing 44）. MethodThe rice seeds were soaked in 0 （water as a control）, 1, 2, 4 and 6 g/L fulvic acid （FA） before sowed. Then, the rice morphological indices, leaf chlorophyll content, photosynthesis parameters, root activity and chlorophyll fluorescence parameters were measured in the following field studies. ResultCompared with the control, the leaf area index, chlorophyll content, net photosynthetic rate, stomatal conductance and dry matter weight and some fluorescence parameters such as the maximum photochemical efficiency of photosystem II （PSII） （Fv/Fm）, excitation energy capture efficiency of opened PSII reaction center （Fv’/Fm’） and efficiency of the open reaction centre （ΦPS II） increased by different levels at both jointing stage and heading stage of direct seeding rice, whose seeds were soaked by FA with different concentrations. High FA concentration （4-6 g/L） significantly increased the cultivated rice leaf area index, chlorophyll content, net photosynthetic rate, stomatal conductance, transpiration rate and dry matter weight by 10.32% -22.88% , 5.88% -13.11% , 12.16% -26.84% , 11.43% -88.46% , 10.63% -21.63% , 18.49% -19.68% , respectively, thereby improving the physiological function and light energy transform efficiency of rice at the growth stage. With FA concentration increasing, the yield, effective panicles, grain number per panicle and seed setting rate were increased significantly compared with the control by 17.52%-18.71%, 3.46%-3.85%, 6.30%- 6.51% and 7.82%-8.69% respectively. ConclusionSoaking rice seed with FA could be considered as an effective way to improve the rice competitiveness at early growth stage. 展开更多
关键词 Fulvic acid Direct seeding rice Growth and development Yield components
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Use of Controlled Release Fertilizer for Increasing N Efficiency of Direct Seeding Rice 认领 引用 被引量：28
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作者 FU JIANRONG, ZHU YUANHONG and JIANG LINA Institute of Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021 《Pedosphere》 SCIE CAS 2001年第4期333-339,共7页
Field trials on a silt-loamy paddy soil derived from shallow-sea deposit in direct seeding rice fields were conducted in Zhejiang, China, in 1996 to compare N efficiency of controlled release fertilizers (LP fertilize... Field trials on a silt-loamy paddy soil derived from shallow-sea deposit in direct seeding rice fields were conducted in Zhejiang, China, in 1996 to compare N efficiency of controlled release fertilizers (LP fertilizers) with the conventional urea. Six treatments including CK (no N fertilizer), conventional urea and different types of LP fertilizers at different rates were designed for two succeeding crops of early and late rice. A blend of different types of LP fertilizers as a single preplant "co-situs" application released N in a rate and amount synchronizing with uptake pattern of direct seeding rice. A single preplant application of the LP fertilizers could meet the N requirement of rice for the whole growth period without need of topdressing. Using LP fertilizer blends, equivalent grain yields could be maintained even if the N fertilization rates were reduced by 25%～50% compared with the conventional urea. Agronomic efficiency of the LP fertilizers was 13.6%～ 86.4% higher than that of the conventional urea in early rice and 100%～164.1% in late rice, depending on the amounts of the LP fertilizers applied. N fertilizer recovery rate increased from 27.4% for the conventional application of urea to 41.7%～54.l% for the single preplant "co-situs" application of the LP fertilizers. Use of the LP fertilizers was promising if the increase in production costs due to the high LP fertilizer prices could be compensated by increase in yield and N efficiency, reduction in labor costs and improvement in environment. 展开更多
关键词 controlled release fertilizer direct seeding rice N efficiency
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Needle tract seeding of papillary thyroid carcinoma after fine-needle capillary biopsy:A case report 认领 引用 被引量：1
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作者 Liu-Hong Shi Liang Zhou +2 位作者 Yin-Jiao Lei Lian Xia Lei Xie 《World Journal of Clinical Cases》 SCIE 2021年第15期3662-3667,共6页
BACKGROUND Fine-needle biopsy is an accurate and cost-efficient tool for the assessment of thyroid nodules.It includes two primary methods:Fine-needle capillary biopsy(FNCB)and fine-needle aspiration biopsy.Needle tra... BACKGROUND Fine-needle biopsy is an accurate and cost-efficient tool for the assessment of thyroid nodules.It includes two primary methods:Fine-needle capillary biopsy(FNCB)and fine-needle aspiration biopsy.Needle tract seeding(NTS)is a rare complication of thyroid fine-needle biopsy mainly caused by fine-needle aspiration biopsy rather than FNCB.Here,we present an extremely rare case of a papillary thyroid carcinoma(PTC)patient with FNCB-derived NTS.CASE SUMMARY We report a 32-year-old woman with PTC who showed subcutaneous NTS 1 year after FNCB and thyroidectomy.NTS was diagnosed based on clinical manifestations,biochemistry indices,and imaging(computed tomography and ultrasound).Pathological identification of PTC metastases consistent with the puncture path is the gold standard for diagnosis.Surgical resection was the main method used to treat the disease.After surgery,thyroid function tests and ultrasound scans were performed every 3-6 mo.To date,no evidence of tumor recurrence has been observed.CONCLUSION FNCB is a safe procedure as NTS is rare,and can be easily removed surgically with no recurrence.Accordingly,NTS should not limit the usefulness of FNCB. 展开更多
关键词 Needle tract seeding Fine-needle capillary biopsy Papillary thyroid carcinoma Rearranged during transfection gene fusion Thyroglobulin antibody Case report
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Application of Special Controlled Release Fertilizer in Direct-seeding of Rapeseeds 认领 引用 被引量：3
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作者 范连益 黄晓勤 +2 位作者 惠荣奎 朱飞翔 邓力超 《Agricultural Science & Technology》 CAS 2015年第4期745-749,共5页
In the east of Hunan Province, the research introduced new-type special controI ed-reIease fertiIizer for rapeseed, ＂Yishizhuang＂, and expIored its appIications in direct-seeding of rapeseed production. The resuIts ... In the east of Hunan Province, the research introduced new-type special controI ed-reIease fertiIizer for rapeseed, ＂Yishizhuang＂, and expIored its appIications in direct-seeding of rapeseed production. The resuIts showed that the appIication of special controI ed reIease fertiIizer for rapeseeds avoids earIy decIine of rapeseed resuIting from fertiIizer Ioss by one-off appIication, improves the number of green Ieaf before winter, and extends photosynthetic Iifespan of pods, which significantIy increases yields. What＆#39; more, with higher output-input ratio, the fertiIizer takes ad-vantages in saving cost, Iabor and increasing yield. 展开更多
关键词 Rapeseed ControI ed release fertliizer Formula fertliizer Direct seeding
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