The Sun is the primary energy source driving the Earth's climate system.A prevailing hypothesis suggests that even minor variations in solar activity,when amplified by climate system feedback mechanisms,can induce...The Sun is the primary energy source driving the Earth's climate system.A prevailing hypothesis suggests that even minor variations in solar activity,when amplified by climate system feedback mechanisms,can induce significant climatic changes on decadal to centennial timescales.However,the limited availability of historical winter climate proxies has impeded consensus on how solar variability influences the long-term winter climate in Northeast Asia,particularly during Grand Solar Minima(GMs).In this study,we analyzed daily-resolution snowfall records in Seoul from 1625 to 1907 CE,derived from the Korean official historical chronicle Seungjeongweon Ilgi.This period encompasses both the Maunder Minimum(1645–1715 CE)and the Dalton Minimum(1790–1830 CE)of solar activity.Our findings indicate that during the GMs,the first date of annual snowfall(FDS)was delayed by approximately 10 days,and the average annual snowfall frequency(ASF)was reduced by half compared to non-GM periods.Additionally,while an 11-year solar cycle was evident in the ASF during non-GM periods,this cycle was replaced by a shortened 8-to 9-year cycle during the GMs.These variations suggest a differential regional climatic response to prolonged changes in solar activity,and provide historical insights that enhance our understanding of the potential impact of low solar activity on the winter climate in Northeast Asia.展开更多
In this article, we have two parts. In the first part, we are concerned with the locally Hlder continuity of quasi-minima of the following integral functional ∫Ωf（x, u, Du）dx, （1） where Ω is an open subset of E...In this article, we have two parts. In the first part, we are concerned with the locally Hlder continuity of quasi-minima of the following integral functional ∫Ωf（x, u, Du）dx, （1） where Ω is an open subset of Euclidean N-space （N ≥ 3）, u：Ω → R,the Carath′eodory function f satisfies the critical Sobolev exponent growth condition ｜Du｜^p＊ ｜u｜^p＊-a（x） ≤ f（x,u,Du） ≤ L（｜Du｜^p＋｜u｜^p＊ ＋ a（x））, （2） where L≥1, 1pN,p^＊ = Np/N-p , and a（x） is a nonnegative function that lies in a suitable Lp space. In the second part, we study the locally Hlder continuity of ω-minima of （1）. Our method is to compare the ω-minima of （1） with the minima of corresponding function determined by its critical Sobolev exponent growth condition. Finally, we obtain the regularity by Ekeland’s variational principal.展开更多
With the advancement of Communication,Navigation and Surveillance(CNS)technolo-gies such as space-based Automatic Dependent Surveillance-Broadcast/Contract(ADS-B/C),large separation minima may be reduced in procedural...With the advancement of Communication,Navigation and Surveillance(CNS)technolo-gies such as space-based Automatic Dependent Surveillance-Broadcast/Contract(ADS-B/C),large separation minima may be reduced in procedural airspaces.It is of great significance to know the upper limit of the Reduced Separation Minima(RSM)for a procedural airspace and the corre-sponding consequences on collision risk with specifics of the advanced ADS-B and control interven-tion model.In this work,an interactive software is first developed for collision risk estimation.This software integrates the International Civil Aviation Organization(ICAO)collision risk models for lateral and longitudinal collision risk calculation for the Singapore procedural airspace.Results demonstrate that the lateral and longitudinal collision risk of Singapore procedural airspace with respect to current control procedures meets the ICAO Target Level of Safety(TLS)standard.Moreover,the feasibility of reducing the horizontal separations implemented in the Singapore pro-cedural airspace with respect to advanced CNS techniques is investigated.It is found that if advanced CNS technologies are applied,then the current 50-NM lateral and longitudinal separa-tion standards can be reduced to 22 NM(1 NM=1.825 km)and 20 NM,respectively,to meet the TLS standards based on current demand.A method is then devised to expand the traffic demand by p for p∈[10%,200%].It is found that the minimum lateral and longitudinal separa-tions can be reduced from 50 NM to be within the range of[23,31]NM,and 20 NM,respectively,for p∈[10%,200%],while the collision risk still meets the TLS standards.展开更多
In order to overcome the drawbacks of conventional artificial potential fields (APF) based methods for the motion planning problems of mobile robots in dynamic uncertain environments, an artificial coordinating fields...In order to overcome the drawbacks of conventional artificial potential fields (APF) based methods for the motion planning problems of mobile robots in dynamic uncertain environments, an artificial coordinating fields (ACF) based method has been proposed recently. This paper deals with the reachability problem of the ACF, that is, how to design and choose the parameters of the ACF and how the environment should be such that the robot can reach its goal without being trapped in local minima. Some sufficient conditions for these purposes are developed theoretically. Theoretical analyses show that, the ACF can effectively remove local minima in dynamic uncertain environments with V-shape or U-shape obstacles, and guide the mobile robot to reach its goal with some necessary environment constraints and based on the methods provided in this paper to properly choose the parameters of the ACF. Comparisons between the ACF and APF, and simulations are provided to illustrate the advantages of the ACF.展开更多
1 Introduction Centipeda minima（Compositae） is an annual herbaceous plant found in moist places throughout the plains mainly in the southern regions of the People＇s Republic of China, Eastern tropical Asia, Austra...1 Introduction Centipeda minima（Compositae） is an annual herbaceous plant found in moist places throughout the plains mainly in the southern regions of the People＇s Republic of China, Eastern tropical Asia, Australia and the Pacific Islands. It is a commonly used Chinese folk medicine for colds, whooping cough, nasal allergy, malaria and asthma. A number of sesquiterpene lactones, flavonoids and triterpenes have previously been isolated from C. minima. During our study on searching for biological active components from this plant,展开更多
OBJECTIVE To explore the effect of ethanolic extract of Physalis minima on lowering blood pressure in the DOCA-salts hypertensive rats.METHODS To produce hypertension,male rats were induced DOCA at dose of 10mg·k...OBJECTIVE To explore the effect of ethanolic extract of Physalis minima on lowering blood pressure in the DOCA-salts hypertensive rats.METHODS To produce hypertension,male rats were induced DOCA at dose of 10mg·kg-1 ip.twice weekly and 0.9% NaCl in drinking water ad libitum for six weeks.The ethanolic extract of Physalis minima were given at dose of 500,1500 and 2500mg·kg-1,respectively for 4weeks.After completion of treatment schedule,systolic blood pressure was evaluated using animal blood pressure analyzer.The serum nitric oxide levels was measured using the ELISA methods.SOD activity and MDA level were determined spectrophotometrically.Endothelial dysfunction was determined by acetylcholine-induced vasorelaxation studies on isolated rat aortas.RESULTS The extract decreased systolic blood pressure significantly(P<0.001)in hypertensive rats.In addition,the extract also suppressed the production of MDA and restored SOD activity to normal level.There was a reduced relaxation response to acetylcholine in isolated aortic rings and serum NO level from hypertensive rats that were reversed by extract.CONCLUSION Physalis minima can lower blood pressure in hypertensive rats and its mechanism may be through the improvement of endothelial function due to the decrease of stress oxidative.展开更多
OBJECTIVE To investigate the effects of ceplukan leaf(Physalis minima L),which contain phytoestrogen physalin and withanolides,toward ventricular TNF-αlevel and fibrosis in ovariectomized rats.METHODS Wistar rats div...OBJECTIVE To investigate the effects of ceplukan leaf(Physalis minima L),which contain phytoestrogen physalin and withanolides,toward ventricular TNF-αlevel and fibrosis in ovariectomized rats.METHODS Wistar rats divided into six groups(K1:normal;K2:5 weeks ovariectomy(OVX);K3:9weeks ovariectomy(OVX),K4,K5,and K5:9weeks OVX+4 weeks ceplukan leaf's methanolic extract dose 500,1500,and 2500 mg·kg-1,respectively.TNF-αlevel measured with ELISA method.Fibrosis measured as blue color percentage in Masson′s Trichrome staining.RESULTS This study showed that prolonged hypoestrogen increase ventricular fibrosis(P<0.05).Ceplukan leaf treatment also resulted in a decreased ventricular fibrosis and TNF-αlevel in dose dependent manner compared with those of without treatment group(P<0.05).Furthermore,the TNF-αlevel normalized in rat treated with 2500mg·kg-1 Physalis minima L(P<0.05).Reduction of fibrosis positively correlated with TNF-αlevel(P<0.05,r= 0.873).CONCLUSION Methanolic extract of ceplukan leaf decrease ventricular fibrosis through inhibition of ventricular TNF-αin ovariectomized rats.Duration of hypoestrogen increase ventricular fibrosis.展开更多
Withaminimas A–F(1–6), six new withaphysalin-type withanolides were isolated from the aerial parts of Physalis minima L.. The structures of these compounds were elucidated through a variety of spectroscopic techniqu...Withaminimas A–F(1–6), six new withaphysalin-type withanolides were isolated from the aerial parts of Physalis minima L.. The structures of these compounds were elucidated through a variety of spectroscopic techniques including HR-MS, NMR, and ECD. Compound 1 belongs to rare 18-norwithanolides, and 2–3 were 13/14-secowithanolides. According to the traditional usage of P. minima, inhibitory effects on nitric oxide(NO) production in lipopolysaccaride-activated RAW264.7 macrophages were evaluated, and compounds 1–4 exhibited significant inhibitory effects with IC50 values among 3.91–18.46 μmol·L–1.展开更多
A sufficient condition on the existence of a global weak sharp minima for general function in metric space is established. A characterization for convex function to have global weak sharp minima is also presented, whi...A sufficient condition on the existence of a global weak sharp minima for general function in metric space is established. A characterization for convex function to have global weak sharp minima is also presented, which generalized Burke and Ferris' result to infinite dimensional space. A characterization of the completeness of a metric space is given by the existence of global weak sharp minima.展开更多
We theoretically investigate the high-order harmonic generation of the one-dimensional hydrogen molecular ion at fixed intermediate internuclear distance, driven by a multicycle laser field. Our results show that the ...We theoretically investigate the high-order harmonic generation of the one-dimensional hydrogen molecular ion at fixed intermediate internuclear distance, driven by a multicycle laser field. Our results show that the initial electronic state of the hydrogen molecular ion affects the modulation of the high-order harmonic spectrum, especially the positions of the minima. Based on the two-state model, the underlying physical mechanism of the minimum is analyzed and discussed. Further analysis shows that the different positions of the minima in the different initial electronic states can be understood via the different interferences of the two phase-adiabatic states at the ionization times.展开更多
<span style="font-family:Verdana;">The sequence of the ribosomal RNA gene (rDNA) plays an important role in species identification and phylogenetic analysis. However, the only published <span style=...<span style="font-family:Verdana;">The sequence of the ribosomal RNA gene (rDNA) plays an important role in species identification and phylogenetic analysis. However, the only published <span style="font-family:Verdana;">full-length sequence of a ribosomal gene of green algae is that of <span style="font-family:Verdana;">Ulva mutabilis<span style="font-family:Verdana;">.<span style="font-family:Verdana;"> In this study, we <a name="_Hlk17805857"><span style="font-family:Verdana;">amplified the full-length sequence of each ribosomal gene unit of the ribosomal gene of <span style="font-family:Verdana;">Blidingia minima<span style="font-family:Verdana;">. The full-length sequence of the ribosomal gene in <span style="font-family:Verdana;">Blidingia minima<span style="font-family:Verdana;"> is 8676 bp, including the 1759 bp 18S rDNA, 576 bp internal transcribed spacer (ITS) + 5.8S rDNA, 3282 bp 28S <span style="font-family:Verdana;">rDNA, and 3059 bp intergenic spacer (IGS) region. We then carried out a series<span style="font-family:Verdana;"> of genetic analyses based on the ITS and IGS sequences, to verify whether IGS <span style="font-family:Verdana;">sequences are useful for studying the genetic diversity of green algae from different locations. We amplified the IGS sequences of <span style="font-family:Verdana;">Blidingia minima<span style="font-family:Verdana;"> from 10 different locations in the Yellow Sea. Multiple alignments of the IGS sequences <span style="font-family:Verdana;">of samples from these 10 different sites revealed varying degrees of base <span style="font-family:Verdana;">differences, and comparative analysis of the ITS sequences revealed that our amplified species was classified as <span style="font-family:Verdana;">Blidingia minima<span style="font-family:Verdana;"> and distinct from other green algae. In conclusion, our full-length amplified ribosomal gene provides useful information to enrich the data on green algae ribosomal genes and provides an effective mo<span style="font-family:Verdana;">lecular marker for the analysis of the interspecies and intraspecies relationships of <span style="font-family:Verdana;">Blidingia minima<span style="font-family:Verdana;">.展开更多
Typically extrema filtration techniques are based on non-parametric properties such as magnitude of prominences and the widths at half prominence, which cannot be used with data that possess a dynamic nature. In this ...Typically extrema filtration techniques are based on non-parametric properties such as magnitude of prominences and the widths at half prominence, which cannot be used with data that possess a dynamic nature. In this work, an extrema identification that is totally independent of derivative-based approaches and independent of quantitative attributes is introduced. For three consecutive positive terms arranged in a line, the ratio (R) of the sum of the maximum and minimum to the sum of the three terms is always 2/n, where n is the number of terms and 2/3 ≤ R ≤ 1 when n = 3. R > 2/3 implies that one term is away from the other two terms. Applying suitable modifications for the above stated hypothesis, the method was developed and the method is capable of identifying peaks and valleys in any signal. Furthermore, three techniques were developed for filtering non-dominating, sharp, gradual, low and high extrema. Especially, all the developed methods are non-parametric and suitable for analyzing processes that have dynamic nature such as biogas data. The methods were evaluated using automatically collected biogas data. Results showed that the extrema identification method was capable of identifying local extrema with 0% error. Furthermore, the non-parametric filtering techniques were able to distinguish dominating, flat, sharp, high, and low extrema in the biogas data with high robustness.展开更多
The status of the names, Physalis minima L. and P. maxima Mill. (Solanaceae), and their alleged presence on the Indian subcontinent are discussed. The issues of nativity and identity of Linnaean Physalis minima are lo...The status of the names, Physalis minima L. and P. maxima Mill. (Solanaceae), and their alleged presence on the Indian subcontinent are discussed. The issues of nativity and identity of Linnaean Physalis minima are long-debated while the use of the name P. maxima Mill. and its report from India are recent. The available evidence indicates that the name "P. minima L." is misapplied to two different elements, viz., P. angulata L. and P. lagascae Roem. & Schult. The name Physalis minima L. may be rejected as nomen confusum, for which the paper provides the primary information. As on today, it is submerged under the synonymy of P. angulata L. The correct name for the widely known P. minima is P. lagascae. The name "P. maxima Mill." applied to the escape and naturalized weed in the Indian subcontinent and elsewhere is to be substituted by P. pruinosa L., a name misapplied to P. grisea (Waterf.) M. Martínez.展开更多
In this paper we discuss the global optimality of vector lengths for lattice bases. By introducing a partial order on lattice bases and the concept of successive minimal basis （SMB for short）, we show that any of it...In this paper we discuss the global optimality of vector lengths for lattice bases. By introducing a partial order on lattice bases and the concept of successive minimal basis （SMB for short）, we show that any of its minimal elements is a general greedy-reduced basis, and its least element （if exists） is an SMB. Furthermore, we prove the existence of SMB for lattices of dimension up to 6.展开更多
Ⅰ. NEW GUAIANOLIDES FROM CENTIPEDA MINIMA The Chinese medical herb Centipeda minima (L.) A. Br. et Ascher (Compositae) has been used for treatment of rhinitis, sinusitis and nasopharynger tumor. Previous chemical inv...Ⅰ. NEW GUAIANOLIDES FROM CENTIPEDA MINIMA The Chinese medical herb Centipeda minima (L.) A. Br. et Ascher (Compositae) has been used for treatment of rhinitis, sinusitis and nasopharynger tumor. Previous chemical investigations only gave steroids and triterpenes and cis-chrysanthenyl acetate. A reinvestigation of the dried drug (whole plant) afforded in addition to the triterpenes and steroids 10-isobutyryloxy-8, 9-epoxithymol-isobutyrate 6, the derivatives 1 and 2, three pseudoguaianolides, arnicolide 7, brevilin8 and helenalin 9, as well as three guaianolides, the 2-O-esters of florilenalin 3—5.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.42388101)the National Natural Science Foundation of China(42241106)CAS Youth Interdisciplinary Team(JCTD-2021-05).
文摘The Sun is the primary energy source driving the Earth's climate system.A prevailing hypothesis suggests that even minor variations in solar activity,when amplified by climate system feedback mechanisms,can induce significant climatic changes on decadal to centennial timescales.However,the limited availability of historical winter climate proxies has impeded consensus on how solar variability influences the long-term winter climate in Northeast Asia,particularly during Grand Solar Minima(GMs).In this study,we analyzed daily-resolution snowfall records in Seoul from 1625 to 1907 CE,derived from the Korean official historical chronicle Seungjeongweon Ilgi.This period encompasses both the Maunder Minimum(1645–1715 CE)and the Dalton Minimum(1790–1830 CE)of solar activity.Our findings indicate that during the GMs,the first date of annual snowfall(FDS)was delayed by approximately 10 days,and the average annual snowfall frequency(ASF)was reduced by half compared to non-GM periods.Additionally,while an 11-year solar cycle was evident in the ASF during non-GM periods,this cycle was replaced by a shortened 8-to 9-year cycle during the GMs.These variations suggest a differential regional climatic response to prolonged changes in solar activity,and provide historical insights that enhance our understanding of the potential impact of low solar activity on the winter climate in Northeast Asia.
基金Supported by the Program of Fujian Province-HongKong
文摘In this article, we have two parts. In the first part, we are concerned with the locally Hlder continuity of quasi-minima of the following integral functional ∫Ωf（x, u, Du）dx, （1） where Ω is an open subset of Euclidean N-space （N ≥ 3）, u：Ω → R,the Carath′eodory function f satisfies the critical Sobolev exponent growth condition ｜Du｜^p＊ ｜u｜^p＊-a（x） ≤ f（x,u,Du） ≤ L（｜Du｜^p＋｜u｜^p＊ ＋ a（x））, （2） where L≥1, 1pN,p^＊ = Np/N-p , and a（x） is a nonnegative function that lies in a suitable Lp space. In the second part, we study the locally Hlder continuity of ω-minima of （1）. Our method is to compare the ω-minima of （1） with the minima of corresponding function determined by its critical Sobolev exponent growth condition. Finally, we obtain the regularity by Ekeland’s variational principal.
文摘With the advancement of Communication,Navigation and Surveillance(CNS)technolo-gies such as space-based Automatic Dependent Surveillance-Broadcast/Contract(ADS-B/C),large separation minima may be reduced in procedural airspaces.It is of great significance to know the upper limit of the Reduced Separation Minima(RSM)for a procedural airspace and the corre-sponding consequences on collision risk with specifics of the advanced ADS-B and control interven-tion model.In this work,an interactive software is first developed for collision risk estimation.This software integrates the International Civil Aviation Organization(ICAO)collision risk models for lateral and longitudinal collision risk calculation for the Singapore procedural airspace.Results demonstrate that the lateral and longitudinal collision risk of Singapore procedural airspace with respect to current control procedures meets the ICAO Target Level of Safety(TLS)standard.Moreover,the feasibility of reducing the horizontal separations implemented in the Singapore pro-cedural airspace with respect to advanced CNS techniques is investigated.It is found that if advanced CNS technologies are applied,then the current 50-NM lateral and longitudinal separa-tion standards can be reduced to 22 NM(1 NM=1.825 km)and 20 NM,respectively,to meet the TLS standards based on current demand.A method is then devised to expand the traffic demand by p for p∈[10%,200%].It is found that the minimum lateral and longitudinal separa-tions can be reduced from 50 NM to be within the range of[23,31]NM,and 20 NM,respectively,for p∈[10%,200%],while the collision risk still meets the TLS standards.
基金This paper was partly supported by the National Natural Science Foundation (No.60131160741,60334010) of China.
文摘In order to overcome the drawbacks of conventional artificial potential fields (APF) based methods for the motion planning problems of mobile robots in dynamic uncertain environments, an artificial coordinating fields (ACF) based method has been proposed recently. This paper deals with the reachability problem of the ACF, that is, how to design and choose the parameters of the ACF and how the environment should be such that the robot can reach its goal without being trapped in local minima. Some sufficient conditions for these purposes are developed theoretically. Theoretical analyses show that, the ACF can effectively remove local minima in dynamic uncertain environments with V-shape or U-shape obstacles, and guide the mobile robot to reach its goal with some necessary environment constraints and based on the methods provided in this paper to properly choose the parameters of the ACF. Comparisons between the ACF and APF, and simulations are provided to illustrate the advantages of the ACF.
基金Supported by the Natural Science Foundation of Tianjin, China(No.07JCZDJC05400).
文摘1 Introduction Centipeda minima（Compositae） is an annual herbaceous plant found in moist places throughout the plains mainly in the southern regions of the People＇s Republic of China, Eastern tropical Asia, Australia and the Pacific Islands. It is a commonly used Chinese folk medicine for colds, whooping cough, nasal allergy, malaria and asthma. A number of sesquiterpene lactones, flavonoids and triterpenes have previously been isolated from C. minima. During our study on searching for biological active components from this plant,
基金The project supported by Republic of Indonesia through the Ministry of National Education Health Professional Education Quality(HPEQ Project)IBRD LOAN NO.7737-IND
文摘OBJECTIVE To explore the effect of ethanolic extract of Physalis minima on lowering blood pressure in the DOCA-salts hypertensive rats.METHODS To produce hypertension,male rats were induced DOCA at dose of 10mg·kg-1 ip.twice weekly and 0.9% NaCl in drinking water ad libitum for six weeks.The ethanolic extract of Physalis minima were given at dose of 500,1500 and 2500mg·kg-1,respectively for 4weeks.After completion of treatment schedule,systolic blood pressure was evaluated using animal blood pressure analyzer.The serum nitric oxide levels was measured using the ELISA methods.SOD activity and MDA level were determined spectrophotometrically.Endothelial dysfunction was determined by acetylcholine-induced vasorelaxation studies on isolated rat aortas.RESULTS The extract decreased systolic blood pressure significantly(P<0.001)in hypertensive rats.In addition,the extract also suppressed the production of MDA and restored SOD activity to normal level.There was a reduced relaxation response to acetylcholine in isolated aortic rings and serum NO level from hypertensive rats that were reversed by extract.CONCLUSION Physalis minima can lower blood pressure in hypertensive rats and its mechanism may be through the improvement of endothelial function due to the decrease of stress oxidative.
基金The project supported by State University Research Grants of Indonesia
文摘OBJECTIVE To investigate the effects of ceplukan leaf(Physalis minima L),which contain phytoestrogen physalin and withanolides,toward ventricular TNF-αlevel and fibrosis in ovariectomized rats.METHODS Wistar rats divided into six groups(K1:normal;K2:5 weeks ovariectomy(OVX);K3:9weeks ovariectomy(OVX),K4,K5,and K5:9weeks OVX+4 weeks ceplukan leaf's methanolic extract dose 500,1500,and 2500 mg·kg-1,respectively.TNF-αlevel measured with ELISA method.Fibrosis measured as blue color percentage in Masson′s Trichrome staining.RESULTS This study showed that prolonged hypoestrogen increase ventricular fibrosis(P<0.05).Ceplukan leaf treatment also resulted in a decreased ventricular fibrosis and TNF-αlevel in dose dependent manner compared with those of without treatment group(P<0.05).Furthermore,the TNF-αlevel normalized in rat treated with 2500mg·kg-1 Physalis minima L(P<0.05).Reduction of fibrosis positively correlated with TNF-αlevel(P<0.05,r= 0.873).CONCLUSION Methanolic extract of ceplukan leaf decrease ventricular fibrosis through inhibition of ventricular TNF-αin ovariectomized rats.Duration of hypoestrogen increase ventricular fibrosis.
基金supported in part by the National Natural Science Foundation of China(No.81430092)the Outstanding Youth Fund of the Basic Research Program of Jiangsu Province(No.BK20160077)the Program for Changjiang Scholars and Innovative Research Team in University(No.IRT_15R63)
文摘Withaminimas A–F(1–6), six new withaphysalin-type withanolides were isolated from the aerial parts of Physalis minima L.. The structures of these compounds were elucidated through a variety of spectroscopic techniques including HR-MS, NMR, and ECD. Compound 1 belongs to rare 18-norwithanolides, and 2–3 were 13/14-secowithanolides. According to the traditional usage of P. minima, inhibitory effects on nitric oxide(NO) production in lipopolysaccaride-activated RAW264.7 macrophages were evaluated, and compounds 1–4 exhibited significant inhibitory effects with IC50 values among 3.91–18.46 μmol·L–1.
基金The research was supported by the National Natural Science Foundation of China(10361008) Natural Science Foundation of Yunnan Province(2003A002M)
文摘A sufficient condition on the existence of a global weak sharp minima for general function in metric space is established. A characterization for convex function to have global weak sharp minima is also presented, which generalized Burke and Ferris' result to infinite dimensional space. A characterization of the completeness of a metric space is given by the existence of global weak sharp minima.
基金supported by the National Natural Science Foundation of China(Grant No.11404204)the Program for the Top Young Academic Leaders of Higher Learning Institutions of Shanxi Province,China
文摘We theoretically investigate the high-order harmonic generation of the one-dimensional hydrogen molecular ion at fixed intermediate internuclear distance, driven by a multicycle laser field. Our results show that the initial electronic state of the hydrogen molecular ion affects the modulation of the high-order harmonic spectrum, especially the positions of the minima. Based on the two-state model, the underlying physical mechanism of the minimum is analyzed and discussed. Further analysis shows that the different positions of the minima in the different initial electronic states can be understood via the different interferences of the two phase-adiabatic states at the ionization times.
文摘<span style="font-family:Verdana;">The sequence of the ribosomal RNA gene (rDNA) plays an important role in species identification and phylogenetic analysis. However, the only published <span style="font-family:Verdana;">full-length sequence of a ribosomal gene of green algae is that of <span style="font-family:Verdana;">Ulva mutabilis<span style="font-family:Verdana;">.<span style="font-family:Verdana;"> In this study, we <a name="_Hlk17805857"><span style="font-family:Verdana;">amplified the full-length sequence of each ribosomal gene unit of the ribosomal gene of <span style="font-family:Verdana;">Blidingia minima<span style="font-family:Verdana;">. The full-length sequence of the ribosomal gene in <span style="font-family:Verdana;">Blidingia minima<span style="font-family:Verdana;"> is 8676 bp, including the 1759 bp 18S rDNA, 576 bp internal transcribed spacer (ITS) + 5.8S rDNA, 3282 bp 28S <span style="font-family:Verdana;">rDNA, and 3059 bp intergenic spacer (IGS) region. We then carried out a series<span style="font-family:Verdana;"> of genetic analyses based on the ITS and IGS sequences, to verify whether IGS <span style="font-family:Verdana;">sequences are useful for studying the genetic diversity of green algae from different locations. We amplified the IGS sequences of <span style="font-family:Verdana;">Blidingia minima<span style="font-family:Verdana;"> from 10 different locations in the Yellow Sea. Multiple alignments of the IGS sequences <span style="font-family:Verdana;">of samples from these 10 different sites revealed varying degrees of base <span style="font-family:Verdana;">differences, and comparative analysis of the ITS sequences revealed that our amplified species was classified as <span style="font-family:Verdana;">Blidingia minima<span style="font-family:Verdana;"> and distinct from other green algae. In conclusion, our full-length amplified ribosomal gene provides useful information to enrich the data on green algae ribosomal genes and provides an effective mo<span style="font-family:Verdana;">lecular marker for the analysis of the interspecies and intraspecies relationships of <span style="font-family:Verdana;">Blidingia minima<span style="font-family:Verdana;">.
文摘Typically extrema filtration techniques are based on non-parametric properties such as magnitude of prominences and the widths at half prominence, which cannot be used with data that possess a dynamic nature. In this work, an extrema identification that is totally independent of derivative-based approaches and independent of quantitative attributes is introduced. For three consecutive positive terms arranged in a line, the ratio (R) of the sum of the maximum and minimum to the sum of the three terms is always 2/n, where n is the number of terms and 2/3 ≤ R ≤ 1 when n = 3. R > 2/3 implies that one term is away from the other two terms. Applying suitable modifications for the above stated hypothesis, the method was developed and the method is capable of identifying peaks and valleys in any signal. Furthermore, three techniques were developed for filtering non-dominating, sharp, gradual, low and high extrema. Especially, all the developed methods are non-parametric and suitable for analyzing processes that have dynamic nature such as biogas data. The methods were evaluated using automatically collected biogas data. Results showed that the extrema identification method was capable of identifying local extrema with 0% error. Furthermore, the non-parametric filtering techniques were able to distinguish dominating, flat, sharp, high, and low extrema in the biogas data with high robustness.
文摘The status of the names, Physalis minima L. and P. maxima Mill. (Solanaceae), and their alleged presence on the Indian subcontinent are discussed. The issues of nativity and identity of Linnaean Physalis minima are long-debated while the use of the name P. maxima Mill. and its report from India are recent. The available evidence indicates that the name "P. minima L." is misapplied to two different elements, viz., P. angulata L. and P. lagascae Roem. & Schult. The name Physalis minima L. may be rejected as nomen confusum, for which the paper provides the primary information. As on today, it is submerged under the synonymy of P. angulata L. The correct name for the widely known P. minima is P. lagascae. The name "P. maxima Mill." applied to the escape and naturalized weed in the Indian subcontinent and elsewhere is to be substituted by P. pruinosa L., a name misapplied to P. grisea (Waterf.) M. Martínez.
文摘In this paper we discuss the global optimality of vector lengths for lattice bases. By introducing a partial order on lattice bases and the concept of successive minimal basis （SMB for short）, we show that any of its minimal elements is a general greedy-reduced basis, and its least element （if exists） is an SMB. Furthermore, we prove the existence of SMB for lattices of dimension up to 6.
文摘Ⅰ. NEW GUAIANOLIDES FROM CENTIPEDA MINIMA The Chinese medical herb Centipeda minima (L.) A. Br. et Ascher (Compositae) has been used for treatment of rhinitis, sinusitis and nasopharynger tumor. Previous chemical investigations only gave steroids and triterpenes and cis-chrysanthenyl acetate. A reinvestigation of the dried drug (whole plant) afforded in addition to the triterpenes and steroids 10-isobutyryloxy-8, 9-epoxithymol-isobutyrate 6, the derivatives 1 and 2, three pseudoguaianolides, arnicolide 7, brevilin8 and helenalin 9, as well as three guaianolides, the 2-O-esters of florilenalin 3—5.
