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| 1 | Ultimate generalization to monotonicity for uniform convergence of trigonometric series显示文摘Chaundy and Jolliffe proved that if {a n } is a non-increasing (monotonic) real sequence with lim n →∞ a n = 0, then a necessary and sufficient condition for the uniform convergence of the series ∑∞ n=1 a n sin nx is lim n →∞ na n = 0. We generalize (or weaken) the monotonic condition on the coefficient sequence {a n } in this classical result to the so-called mean value bounded variation condition and prove that the generalized condition cannot be weakened further. We also establish an analogue to the generalized Chaundy-Jolliffe theorem in the complex space. | Zhou SongPing Zhou Ping Yu DanSheng | 2010 | Science China Mathematics2010，53，7： | 9 |
| 2 | Environmental and canopy conditions regulate the forest floor evapotranspiration of larch plantations显示文摘Background:Integrated forest-water management focusing on forest-water coordination is an important way to alleviate water use conflicts among forests and other sectors in vast dryland regions.Forest floor evapotranspiration(FE),which is an important component of forest evapotranspiration,accounts for a large proportion of the water consumed in arid forests.Elucidating how environmental and canopy conditions impact FE has important significance for guiding integrated forest-water management in a changing environment.Methods:The microlysimeter(ML)-measured evapotranspiration(FE_(ML)),reference evapotranspiration(ET_(o)),volumetric soil moisture(VSM),and canopy leaf area index(LAI)were monitored in a Larix principis-rupprechtii plantation located in the semi-humid Liupan Mountains of Northwest China in 2019(June–September)and 2021(May–September).The response functions of the FE coefficient(the ratio of daily FEML to ET_(o))to the individual factors of VSM and LAI were determined using upper boundary lines of scatter diagrams of measured data.The framework of the daily FE(FE_(ML))model was established by multiplying the response functions to individual factors and then calibrated and validated using measured data to assess the FE response to environmental and canopy conditions.Results:(1)The FE coefficient increased first rapidly and then slowly with rising VSM but decreased slowly with rising LAI.(2)The simple daily FE(FE_(ML))model developed by coupling the impacts of ET_(o),LAI,and VSM in this study performed well for predicting FE.(3)The impacts of ET_(o),LAI,and VSM were quantified using the FE(FE_(ML))model,e.g.,at a given VSM,the impact of ETo on FE increased obviously with decreasing LAI;at a given ET_(o),the impact of LAI on FE increased with rising VSM.(4)In the two study years,when directly using the microlysimeter measurement,the real FE on the forest floor was overestimated when the VSM in microlysimeters was above 0.215 but underestimated below 0.215 due to the difference in VSM from the forest floor.Thus,the VSM on the forest floor should be input into the FE model for estimating the real FE on the forest floor.Conclusions:The daily FE of larch plantation is controlled by three main factors of environmental(ET_(o) and VSM)and canopy conditions(LAI).The variation in daily FE on the forest floor can be well estimated using the simple FE model coupling the effects of the three main factors and by inputting the VSM on the forest floor into the model to avoid the errors when directly using the microlysimeter measurement with different VSMs from the forest floor.The developed FE model and suggested prediction approach are helpful to estimate the FE response to changing conditions,and to guide forest management practices when saving water by thinning is required. | Zebin Liu Yanhui Wang Pengtao Yu Lihong Xu Songping Yu | 2022 | Forest Ecosystems2022，9，5： | 1 |
| 3 | Local delivery of superagonist gene based on polymer nanoparticles for cancer immunotherapy显示文摘Cancer is the leading cause that threatens human life expectancy due to the lack of effective therapies.Cancer immunotherapy has been explored to improve the body's immune system against cancer and accompanied by promising results in recent years.Interleukin 15(IL-15),a pleiotropic immunomodulator,is critical for immune cells development and displays great anti-tumor potential in both preclinical and clinical trials.In this study,superagonist IL-15 plasmid(psIL-15)consisting of IL-15Rα-sushi-linker-IL-15 was constructed in order to secret superagonist IL-15(sIL-15)in tumor site.A gene delivery system through self-assembly by methylated polyethylene glycol-b-polylactic acid-b-methylated polyethylene glycol(m PEG-PLA-m PEG)and 1,2-dioleoyl-3-trimethylammonium-propane(DOTAP),named DMAM,was designed to deliver psIL-15.Further study showed that DMAM/psIL-15 could successfully deliver psIL-15 to tumor cells and the supernatants of the tumor cells could further stimulate lymphocytes proliferation as well as activation in vitro.Local delivery of DMAM/psIL-15 in animal models demonstrated significant tumor inhibition through enhancing immune cells responses,reducing angiogenesis,promoting tumor cell apoptosis and inhibiting proliferation,with no evidence of system toxicities.These results indicate that DMAM/psIL-15 may be a promising strategy for cancer immunotherapy. | Zehua Hong Xin Zan Ting Yu Yuzhu Hu Hongfeng Gou Songping Zheng Xiang Gao Peizhi Zhou | 2023 | Chinese Chemical Letters2023，34，3： | 1 |
| 4 | Effects of the serum contained Bushen Tiaochong Recipe on ratsovarian granulosa cell proliferation,steroidogenesis and associated gene expression显示文摘 | Xia Tian Luo Songping Fu Yu etc | 2007 | Chinese Journal of Integrated traditional medicine2007，13，3： | 1 |
| 5 | Global and point- wise estimates for approximation by rational functions with polynomials of positive coefficients as the denom- inators显示文摘 | YU Dansheng ZHOU Songping | 2011 | Acta Math Sci2011，31，2： | 1 |
| 6 | APPROXIMATION BY RATIONAL FUNCTIONS WITH POLYNOMIALS OF POSITIVE COEFFICIENTS AS THE DENOMINATORS显示文摘The present paper proves that if f(x)∈C[0,1],changes its sign exactly l times at 0 | Dansheng Yu Songping Zhou | 2006 | Analysis in Theory and Applications2006，22，1： | 1 |
| 7 | Effects of the serum contained Bushen Tiaoehong Recipe on rats ovarian granulosa cell proliferation,steroidogenesis and associated gene expression显示文摘 | Luo Songping Fu Yu Han Bing | 2007 | Chinese Journal of Integrated traditional medicine2007，13，3： | 1 |
| 8 | SOME NEW CONDITIONS IN FOURIER ANALYSIS AND APPLICATIONS显示文摘我们作为 monotonicity 状况的归纳在 Fourier 分析调查一些条件。特别,我们给 GBVS 的一些应用,序列满足条件并且。给词调音三角法的系列 - 一致集中 - L 鈥 ? 集中 AMS (2000 ) 题目分类 42A20 - 中国(10471130 ) 的 NSF 部分地支持的 42A32。近似理论和遥感应用上的国际会议上的邀请报告, Kungming,中国, | Songping Zhou Dansheng Yu Ruijun Le | 2007 | Analysis in Theory and Applications2007，23，1： | 1 |
| 9 | WEIGHTED L^p-APPROXIMATION BY THE MODIFIED NEVAI OPERATORS显示文摘The present paper gives a Jackson type estimate for Nevai operators under weighted Lp norm, and establishes the direct and converse theorems in some proper Besov spaces. | Dansheng Yu Songping Zhou | 2005 | Analysis in Theory and Applications2005，21，3： | 0 |
| 10 | Impacts of environmental and canopy conditions on the nighttime sap flow of larch plantations in the Liupan Mountains,China显示文摘Nighttime sap flow(Q_(n))is an important physiological activity under which trees manage drought stress.An in-depth understanding of the characteristics of Q_(n)and its response to environmental and canopy conditions are of significance for arid area forest and water management.This study measured daily sap flow(Q_(s))of a Larix principis-rupprechtii plantation in the Liupan Mountains,northwest China during the 2017-2019 growing seasons,and separated Q_(s)into daytime sap flow(Qd)and Q_(n).Meteorological conditions(reference evapotranspiration,ETref),canopy structure(leaf area index,LAI),and soil moisture(relative soil water content,RSWC)were considered as the main biophysical factors affecting Q_(n).The structural equation model and upper boundary line method determined the effects of compound and single factors on Q_(n)The daily mean Q_(n)values during the growing seasons in 2017,2018,and 2019 were 0.024,0.026,and 0.030 mm d-1,accounting for 6.2,11.2,and 10.1%of Q_(s),respectively.Q_(n)at different canopy development phases(leaf expanding,LG;leaf expanded,LD;and defoliation,DF)over three years was LD>LG>DF.Q_(n)increased with increasing ETref,whereas the ratio of Q_(n)to Q_(s)decreased.Q_(n)did not show regular variation in the three-year growing seasons under different soil moisture conditions.ETrefand LAI mainly controlled Q_(n)by affecting Qd,whereas RSWC had no significant effect on Q_(n).Q_(n)had a positive and linear relationship with LAI and a quadratic relationship with ETref.Both explained 40%of variation in Q_(n)Meteorological and canopy conditions are important factors affecting Q_(n)on the semi-humid study site.The application of the Q_(n)model coupled with the impact of ETrefand LAI furthers understanding of the impacts of climate and forest structure change on Q_(n). | Songping Yu Jianbin Guo Zebin Liu Yanhui Wang Lihong Xu Pengtao Yu Liang He | 2023 | Journal of Forestry Research2023，34，6： | 0 |
| 11 | Microacoustic Imaging Technique for Bulk Microstructure Characterization of Woven CFRC Materials显示文摘In short wavelength case ultrasound propagation through woven carbon fiber-rein-forced composite (CFRC) materials essentially depends on their microstructure.Fiber bundle and weaving ply can be considered as basic structural elements of woven CFRC laminates.These structural units provide effective reflectors when ultra-short impulse high frequency ultrasound impinges on woven laminates.The reflection coefficient R0 achieves level of 3%-15% at ply-ply interface,0.2-0.4 in resin pocket region.This magnitude of reflection coefficient offers reasonable acoustic contrast to see packing,lay-up and resin pockets in woven laminate body by acoustic imaging methods.Microacoustic imaging technique is based on time-resolved echoes from reflections in woven CFRC laminates.A focal system with low aperture angle is used to generate 20-40 probe ultrasonic pulse wave.Its spatial resolution is up to 60mm at 50MHz in woven CFRC laminate.The results presented in this paper demonstrates the possibility and potentiality of characterization of microstrueture of woven CFRC laminates.Packing,lay-up,weaving nature,fiber bundle,resin pocket as well as their topology are exhibited clearly in the acoustic images by using microaeoustic technique. | Liu Songping Guo Enming Liu Feifei Li Legang V.M.Levin Yu S Petronyuk | 2007 | 航空制造技术2007，50，z1： | 0 |
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