Combined with recent historical climate data and two periods of land use data sets from remote sensing data, we test the net primary productivity (NPP) data sets in North China modelled by the satellite data-driven Gl...Combined with recent historical climate data and two periods of land use data sets from remote sensing data, we test the net primary productivity (NPP) data sets in North China modelled by the satellite data-driven Global Production Efficiency Model (GLO-PEM) for detecting the widespread spatial and temporal characteristics of the impacts of climate and land use change on the regional NPP. Our results show that over the past 20 years, the mean annual temperature in the study region has remarkably increased by more than 0.064 oC, but over the same period, there has been a 1.49 mm decrease in annual precipitation and decrease in NPP by an annual rate of 6.9 TgC. The NPP changes in the study region were greatly affected by the average temperature and precipitation by ten-day periods as well as the seasonal temperature and precipitation in the study region. The correlation between seasonal NPP and seasonal precipitation and temperature is highly consistent with land cover spatially, and the correlation coefficient changes with the changes of vegetation types. The analysis reveals that the related areas in land use change only take up 5.45% of the whole studied region, so the climate changes dominate the impacts on the NPP in the whole study region (90% of the total). However, land use plays an absolute dominative role in areas with land cover changes, accounting for 97% of the total. From 1981 to 2000, the NPP in the whole study region remarkably reduced due to obvious precipitation decrease and temperature rise. Between two periods of land use (about 10 years), the changes in climate are predicted to promote a decrease in NPP by 78 (±0.6) TgC, and integrated impacts of climate changes and land use to promote a decrease in NPP by 87(±0.8) TgC.展开更多
A new method for preparing effective inhibition film on copper has been developed. Phenylthiourea (PT) was first absorbed to copper surface to form a monolayer. 1-Dodecanethiol (DT) was then assembled on the surface...A new method for preparing effective inhibition film on copper has been developed. Phenylthiourea (PT) was first absorbed to copper surface to form a monolayer. 1-Dodecanethiol (DT) was then assembled on the surface for modification. Finally, AC voltage was loaded on copper covered the mixed film to improve it further. After these processes, an effective inhibition film was gained because of its high charge transfer resistance and low corrosion current density shown in electrochemical impedance spectra and polarization. The inhibition efficiency was more than 97%.展开更多
Two possible lower barrier reaction pathways in the reaction HF+HOBOH2O+FBO are predicated by means of MP2 and CCSD(T) (single-point) methods. In the two channels, two stable intermediates are located, and thus, they...Two possible lower barrier reaction pathways in the reaction HF+HOBOH2O+FBO are predicated by means of MP2 and CCSD(T) (single-point) methods. In the two channels, two stable intermediates are located, and thus, they are multi-step channels, which are more favorable in energy than direct single-step reaction pathway predicated by previous theoretical study. Therefore, the two pathways should be main reaction channels in experiments.展开更多
Using the basic solutions of a single crack and a single inclusion, and making use of the principle of linear superposition of elastic mechanics, the interaction problem between a planar crack and a flat inclusion in ...Using the basic solutions of a single crack and a single inclusion, and making use of the principle of linear superposition of elastic mechanics, the interaction problem between a planar crack and a flat inclusion in an elastic solid is studied. The problem is reduced to solve a set of standard Cauchy-type singular equations. And the stress intensity factors at points of crack and inclusion were obtained. Besides, the singularity for the horizontal contact of crack and inclusion was analyzed. The calculating model put forward can be regarded as a new technique for studying the crack and its expanding caused by inclusion lip. Then several numerical examples are given.展开更多
Aims: To observe the clinical effect of acupuncture plus acupoint injection of Acidi Nucleici et Caseini Hydrolysatis Composita in the treatment of allergic rhinitis. Methods: Ninety five cases of allergic rhinitis pa...Aims: To observe the clinical effect of acupuncture plus acupoint injection of Acidi Nucleici et Caseini Hydrolysatis Composita in the treatment of allergic rhinitis. Methods: Ninety five cases of allergic rhinitis patients were randomized into acupuncture plus acupoint injection group (treatment group, n=40), acupuncture group (control group A, n=30) and muscular injection group (control group B, n=25). Yingxiang (LI 20), Yintang (EX HN 3), Baihui (GV 20), Fengchi (GB 20), Fengmen (BL 12), Feishu (BL 13), etc. were used. Results: Following 20 days’ treatment, of the 40, 30 and 25 cases of allergic rhinitis in treatment, control A and B groups, 16 (40.0%), 8 (26.7%) and 0 were cured, 22 (55.0%), 14 (46.7%) and 4 (16.0%) experienced improvement in their symptoms and signs, and 2 (5.0%), 8 (26.7%) and 21 (84.0%) failed in the treatment, with the effective rates being 95.0%, 73.3% and 16.0% separately. The therapeutic effect of treatment group was significantly superior to those of two control groups (P<0.05, 0.01). Conclusion: The therapeutic effect of acupuncture plus acupoint injection of Injecto Acidi Nucleici et Caseini Hydrolysatis Composita is definite.展开更多
In this paper, α -times integrated C-regularized cosine functions and mild α-times integrated C-existence families of second order are introduced. Equivalences are proved among α -times integrated C-regularized cos...In this paper, α -times integrated C-regularized cosine functions and mild α-times integrated C-existence families of second order are introduced. Equivalences are proved among α -times integrated C-regularized cosine function for a linear operator A, C-wellposed of (α + 1)-times abstract Cauchy problem and mild α -times integrated C-existence family of second order for A when the commutable condition is satisfied. In addition, if A = C-1AC, they are also equivalent to A generating the α -times integrated C-regularized cosine finction.The characterization of an exponentially botnded mild α -times integrated C-existence family of second order is given out in terms of a Laplace transform.展开更多
Based on observational data and facsimile charts from Dec. 1994 to Nov. 1995 of Chinese Antarctic Great Wall Station, the local fine weather was studied. Pressure, temperature and humidity field, and aerological strat...Based on observational data and facsimile charts from Dec. 1994 to Nov. 1995 of Chinese Antarctic Great Wall Station, the local fine weather was studied. Pressure, temperature and humidity field, and aerological stratification were analyzed synoptically. Two kinds of fine weather with different physical characteristics were found; one was caused by the spreading of subtropical high with high tem- perature and high humidity, and another was connected with polar high with low temperature and low humidity. The research provide a synoptic background for the local fine weather forecast.展开更多
Macroporous poly (vinyl acetate-co-triallyl isocyanurate) beads were prepared with suspension polymerization method. The copolymer beads were then transformed into poly (vinyl alcohol-co-triallyl isocyanurate) by est...Macroporous poly (vinyl acetate-co-triallyl isocyanurate) beads were prepared with suspension polymerization method. The copolymer beads were then transformed into poly (vinyl alcohol-co-triallyl isocyanurate) by ester exchange reaction. Aminocarboxylic acids were immobilized on the copolymer beads by the esterification of hydroxyl groups with diethyl-lenetriaminepentaacetic bisanhydride. The weak acid exchange capacities, specific surface areas and mean pore diameters of the resultant resin beads were measured.展开更多
Seismic safety evaluation is a basic work for determining the seismic resistance requirements of major construc-tion projects. The effect, especially the economic effect of the seismic safety evaluation has been gener...Seismic safety evaluation is a basic work for determining the seismic resistance requirements of major construc-tion projects. The effect, especially the economic effect of the seismic safety evaluation has been generally con-cerned. The paper gives a model for estimating the effect of seismic safety evaluation and calculates roughly the economic effect of seismic safety evaluation with some examples.展开更多
From the Navier-Stokes equations, the integral expressions of the free-surface elevation and the velocity field in ship waves of a moving waterborne body are obtained. Next, Lighthill' s two-stage scheme is employ...From the Navier-Stokes equations, the integral expressions of the free-surface elevation and the velocity field in ship waves of a moving waterborne body are obtained. Next, Lighthill' s two-stage scheme is employed to change the above-mentioned integral expressions to algebraic expressions. Compared with the results obtained when the seawater is idealized to an inviscid fluid, the singularities are dispelled or weakened, and the accuracy of the digit information of ship waves is improved.展开更多
Objective To study the influence of salivary lipids on the adherence of cariogenic bacteria (S.mutans Ingbritt and BF; S.sobrinus OMZ176 and 6715). Methods Mixed saliva was collected from 10 healthy subjects (5 males ...Objective To study the influence of salivary lipids on the adherence of cariogenic bacteria (S.mutans Ingbritt and BF; S.sobrinus OMZ176 and 6715). Methods Mixed saliva was collected from 10 healthy subjects (5 males and 5 females, aged 21～23). The salivary lipids was depleted under nondenatural condition (-10℃, ethanol∶ether 3∶2 V∶V ). The adherence of S.mutans and S.sobrinus to the experimental pellicles formed from mixed saliva or lipids-depleted saliva was investigated with 3H-TdR incorperation assay. Results The amount of S.mutans Ingbritt and BF adhered to lipids-depleted pellicle were significantly increased ( P <0.05). The amount of experimental bacteria adhered to lipids-depleted pellicle or mixed salivary pellicle were following the regular pattern: Ingbritt>BF>OMZ176>6715. Conclusion Salivary lipids significantly decreased the number of S.mutans adhered to pellicle.展开更多
This paper proposes a novel approach for image lossless compression based on fuzzy logic and adaptive prediction. By a flexible strategy, the method can acquire a set of original predictors describing the more detail ...This paper proposes a novel approach for image lossless compression based on fuzzy logic and adaptive prediction. By a flexible strategy, the method can acquire a set of original predictors describing the more detail characteristic. Using a neural network, the proposed method can more efficiently organize the training of original predictors and implement adaptive prediction in fuzzy style. In entropy coding phase, the context-based conditional adaptive arithmetic encoding is adopted. The experiments demonstrate the characteristics make the approach achieve good tradeoff between computational complexity and efficiency of prediction and good performance for lossless compression.展开更多
Through systematic analysis and comparison of the common features of SAA, ES and traditional LS (local search) algorithm, a new hybrid strategy of mixing SA, ES with LS, namely HIEA (Hybrid Intelligent Evolutionary Al...Through systematic analysis and comparison of the common features of SAA, ES and traditional LS (local search) algorithm, a new hybrid strategy of mixing SA, ES with LS, namely HIEA (Hybrid Intelligent Evolutionary Algorithm), is proposed in this paper. Viewed as a whole, the hybrid strategy is also an intelligent heuristic searching procedure. But it has some characteristics such as generality, robustness, etc., because it synthesizes advantages of SA, ES and LS, while the shortages of the three methods are overcome. This paper applies Markov chain theory to describe the hybrid strategy mathematically, and proves that the algorithm possesses the global asymptotical convergence and analyzes the performance of HIEA.展开更多
In this paper,we present a constructive proof of Lueroth’s theorem in differential case.We also give a method to fing the inversion maps for general differential rational parametric equations.As a consequence,we prov...In this paper,we present a constructive proof of Lueroth’s theorem in differential case.We also give a method to fing the inversion maps for general differential rational parametric equations.As a consequence,we prove that a differential rational curve always has a set of proper parametric equations.展开更多
基金National 973 Project No.2002CB412507+5 种基金 National Natural Science Foundation of China No.90202002 Knowledge Innovation Project of IGSNRR CAS No.CXIOG-E01-02-04 One Hundred Talents Program of CAS.
文摘Combined with recent historical climate data and two periods of land use data sets from remote sensing data, we test the net primary productivity (NPP) data sets in North China modelled by the satellite data-driven Global Production Efficiency Model (GLO-PEM) for detecting the widespread spatial and temporal characteristics of the impacts of climate and land use change on the regional NPP. Our results show that over the past 20 years, the mean annual temperature in the study region has remarkably increased by more than 0.064 oC, but over the same period, there has been a 1.49 mm decrease in annual precipitation and decrease in NPP by an annual rate of 6.9 TgC. The NPP changes in the study region were greatly affected by the average temperature and precipitation by ten-day periods as well as the seasonal temperature and precipitation in the study region. The correlation between seasonal NPP and seasonal precipitation and temperature is highly consistent with land cover spatially, and the correlation coefficient changes with the changes of vegetation types. The analysis reveals that the related areas in land use change only take up 5.45% of the whole studied region, so the climate changes dominate the impacts on the NPP in the whole study region (90% of the total). However, land use plays an absolute dominative role in areas with land cover changes, accounting for 97% of the total. From 1981 to 2000, the NPP in the whole study region remarkably reduced due to obvious precipitation decrease and temperature rise. Between two periods of land use (about 10 years), the changes in climate are predicted to promote a decrease in NPP by 78 (±0.6) TgC, and integrated impacts of climate changes and land use to promote a decrease in NPP by 87(±0.8) TgC.
基金Subsidized with the Special Funds for the Major State Basic Research Projects G19990650 and the Chinese National Science Fund (No. 20173033).
文摘A new method for preparing effective inhibition film on copper has been developed. Phenylthiourea (PT) was first absorbed to copper surface to form a monolayer. 1-Dodecanethiol (DT) was then assembled on the surface for modification. Finally, AC voltage was loaded on copper covered the mixed film to improve it further. After these processes, an effective inhibition film was gained because of its high charge transfer resistance and low corrosion current density shown in electrochemical impedance spectra and polarization. The inhibition efficiency was more than 97%.
基金This work is supported by the National Natural Science Foundation of China (No. 20171015 20171016)+1 种基金 the Natural Science Foundation of Heilongjiang Province (No. E00-16) and the Science Foundation for Excellent Youth of Heilongjiang University (2002
文摘Two possible lower barrier reaction pathways in the reaction HF+HOBOH2O+FBO are predicated by means of MP2 and CCSD(T) (single-point) methods. In the two channels, two stable intermediates are located, and thus, they are multi-step channels, which are more favorable in energy than direct single-step reaction pathway predicated by previous theoretical study. Therefore, the two pathways should be main reaction channels in experiments.
文摘Using the basic solutions of a single crack and a single inclusion, and making use of the principle of linear superposition of elastic mechanics, the interaction problem between a planar crack and a flat inclusion in an elastic solid is studied. The problem is reduced to solve a set of standard Cauchy-type singular equations. And the stress intensity factors at points of crack and inclusion were obtained. Besides, the singularity for the horizontal contact of crack and inclusion was analyzed. The calculating model put forward can be regarded as a new technique for studying the crack and its expanding caused by inclusion lip. Then several numerical examples are given.
文摘Aims: To observe the clinical effect of acupuncture plus acupoint injection of Acidi Nucleici et Caseini Hydrolysatis Composita in the treatment of allergic rhinitis. Methods: Ninety five cases of allergic rhinitis patients were randomized into acupuncture plus acupoint injection group (treatment group, n=40), acupuncture group (control group A, n=30) and muscular injection group (control group B, n=25). Yingxiang (LI 20), Yintang (EX HN 3), Baihui (GV 20), Fengchi (GB 20), Fengmen (BL 12), Feishu (BL 13), etc. were used. Results: Following 20 days’ treatment, of the 40, 30 and 25 cases of allergic rhinitis in treatment, control A and B groups, 16 (40.0%), 8 (26.7%) and 0 were cured, 22 (55.0%), 14 (46.7%) and 4 (16.0%) experienced improvement in their symptoms and signs, and 2 (5.0%), 8 (26.7%) and 21 (84.0%) failed in the treatment, with the effective rates being 95.0%, 73.3% and 16.0% separately. The therapeutic effect of treatment group was significantly superior to those of two control groups (P<0.05, 0.01). Conclusion: The therapeutic effect of acupuncture plus acupoint injection of Injecto Acidi Nucleici et Caseini Hydrolysatis Composita is definite.
基金This project is supported by the Natural Science Foundation of China and Science Development Foundation of the Colleges and University of Shanghai.
文摘In this paper, α -times integrated C-regularized cosine functions and mild α-times integrated C-existence families of second order are introduced. Equivalences are proved among α -times integrated C-regularized cosine function for a linear operator A, C-wellposed of (α + 1)-times abstract Cauchy problem and mild α -times integrated C-existence family of second order for A when the commutable condition is satisfied. In addition, if A = C-1AC, they are also equivalent to A generating the α -times integrated C-regularized cosine finction.The characterization of an exponentially botnded mild α -times integrated C-existence family of second order is given out in terms of a Laplace transform.
文摘Based on observational data and facsimile charts from Dec. 1994 to Nov. 1995 of Chinese Antarctic Great Wall Station, the local fine weather was studied. Pressure, temperature and humidity field, and aerological stratification were analyzed synoptically. Two kinds of fine weather with different physical characteristics were found; one was caused by the spreading of subtropical high with high tem- perature and high humidity, and another was connected with polar high with low temperature and low humidity. The research provide a synoptic background for the local fine weather forecast.
基金This work was supported by the National 973 project (G1999064707)
文摘Macroporous poly (vinyl acetate-co-triallyl isocyanurate) beads were prepared with suspension polymerization method. The copolymer beads were then transformed into poly (vinyl alcohol-co-triallyl isocyanurate) by ester exchange reaction. Aminocarboxylic acids were immobilized on the copolymer beads by the esterification of hydroxyl groups with diethyl-lenetriaminepentaacetic bisanhydride. The weak acid exchange capacities, specific surface areas and mean pore diameters of the resultant resin beads were measured.
文摘Seismic safety evaluation is a basic work for determining the seismic resistance requirements of major construc-tion projects. The effect, especially the economic effect of the seismic safety evaluation has been generally con-cerned. The paper gives a model for estimating the effect of seismic safety evaluation and calculates roughly the economic effect of seismic safety evaluation with some examples.
文摘From the Navier-Stokes equations, the integral expressions of the free-surface elevation and the velocity field in ship waves of a moving waterborne body are obtained. Next, Lighthill' s two-stage scheme is employed to change the above-mentioned integral expressions to algebraic expressions. Compared with the results obtained when the seawater is idealized to an inviscid fluid, the singularities are dispelled or weakened, and the accuracy of the digit information of ship waves is improved.
文摘Objective To study the influence of salivary lipids on the adherence of cariogenic bacteria (S.mutans Ingbritt and BF; S.sobrinus OMZ176 and 6715). Methods Mixed saliva was collected from 10 healthy subjects (5 males and 5 females, aged 21～23). The salivary lipids was depleted under nondenatural condition (-10℃, ethanol∶ether 3∶2 V∶V ). The adherence of S.mutans and S.sobrinus to the experimental pellicles formed from mixed saliva or lipids-depleted saliva was investigated with 3H-TdR incorperation assay. Results The amount of S.mutans Ingbritt and BF adhered to lipids-depleted pellicle were significantly increased ( P <0.05). The amount of experimental bacteria adhered to lipids-depleted pellicle or mixed salivary pellicle were following the regular pattern: Ingbritt>BF>OMZ176>6715. Conclusion Salivary lipids significantly decreased the number of S.mutans adhered to pellicle.
文摘This paper proposes a novel approach for image lossless compression based on fuzzy logic and adaptive prediction. By a flexible strategy, the method can acquire a set of original predictors describing the more detail characteristic. Using a neural network, the proposed method can more efficiently organize the training of original predictors and implement adaptive prediction in fuzzy style. In entropy coding phase, the context-based conditional adaptive arithmetic encoding is adopted. The experiments demonstrate the characteristics make the approach achieve good tradeoff between computational complexity and efficiency of prediction and good performance for lossless compression.
文摘Through systematic analysis and comparison of the common features of SAA, ES and traditional LS (local search) algorithm, a new hybrid strategy of mixing SA, ES with LS, namely HIEA (Hybrid Intelligent Evolutionary Algorithm), is proposed in this paper. Viewed as a whole, the hybrid strategy is also an intelligent heuristic searching procedure. But it has some characteristics such as generality, robustness, etc., because it synthesizes advantages of SA, ES and LS, while the shortages of the three methods are overcome. This paper applies Markov chain theory to describe the hybrid strategy mathematically, and proves that the algorithm possesses the global asymptotical convergence and analyzes the performance of HIEA.
基金This research is supported in part by CNSF under an Outstanding Youth Grant(No. 69725002) by a "973" Project.
文摘In this paper,we present a constructive proof of Lueroth’s theorem in differential case.We also give a method to fing the inversion maps for general differential rational parametric equations.As a consequence,we prove that a differential rational curve always has a set of proper parametric equations.
