We prove the existence and uniqueness of solutions to stochastic differential equations dXt=F(X)tdZt,where F is non-Lipschitz coefficient and Z is in a kind of special semimartingale.
Using the method of truncation,we get the moderate deviations for triangular arrays of random variables {Xn,j;1≤j≤kn,n≥1} under some conditions of tail probability,where {kn;n≥1} is a sequence of strictly increasing positive integers and for any fixed n,{Xn,j;1≤j≤kn} are i.i.d.
The fine absorption bands of three aromatic amino acid residues,Tryptophan (Trp),Tyrosine (Tyr),and Phenylalanine (Phe),of bovine serum albumin (BSA) were studied by ultraviolet second derivative spectroscopy.The conformation transitions of BSA at pH 2.3-12 were analyzed along with the absorption spectrum of the peptide bonds.It is observed that there exist obvious conformation transitions around the isoelectric point (pH 4.7) of BSA.The transitions are subtle between pH 5.7 and pH 10 but distinct in strong acidity(pH 2.3) and alkaline(pH 12) environments. Meanwhile,the concentration of BSA has certain effect on the conformation transition.
We modeled the impoundment induced stress change in channel reservoir by two-dimensional finite element method.We calculated Coulomb failure stress change on the fault striking parallel to the major axis of reservoir.Compared to the regional stress field,the compressive stress caused by impoundment is small and is most confined within several kilometers depth.If the background stress is in favor of normal faulting some faults with certain dips and depths would come closer to failure,while if the background stress is in favor of shallow thrust those thrusts would be safer after reservoir impoundment.
We present an integrated mobile 3D GIS system in a client-server architecture,which streamlines the processes across real-time field data collection,dynamical computer modeling,and human-machine interoperation.In this system,smart-phones run as GIS clients to collect local field information and communicate with remote GIS servers by wireless network.The GIS server stores the data from smart-phones into geospatial databases,builds 3D scenes dynamically,and feedbacks them to all its connected GIS clients.A prototype of the mobile 3D GIS system has been developed using C/C+ + and VB.Net and tested in Beijing.The results show that this mobile solution could significantly improve the efficiency of field data collection.
A few of numerical solution methods are briefly introduced, including MOC,MMOC,HOMC, and TVD, which are implemented in MT3DMS. Comparative analyses of mass errors and longitudinal dispersivity values obtained using the different methods were conducted. In addition, the impacts of the grid size and source concentration were examined. We present the basic procedure and the suitability analyses for longitudinal dispersivity estimation by numerical simulations.
Using meteorological site data in Heilongjiang drainage basin as the 'truth valves’,we evaluated the snow identification accuracies of MODIS snow products and AMSR-E data from 2002~2007 and analyzed the influence of cloud and altitude on the snow identification accuracy.The results showed that MOD10A2,MOD10C2,and AMSR-E snow identification accuracies are 75.4%,88.7%,and 88.9%,respectively.The existence of cloud is the main factor affecting snow identification accuracy. MOD10C2 snow identification results are close to the true values of meteorological stations and AMSR-E tends to overestimate the snow cover area.Besides,the results indicate that snow cover areas derived from the soft classification of MOD10A2 and MOD10C2 are smaller less than that derived from the hard classification,and the results obtained from the soft classification are closer to the true values.
In applying the successive over-relaxation iteration method to solve large-scale linear equations,one often has difficulties in determining the acceleration factor.Through training and learning using BP neural network and comparative analyses, we obtained a good model,which could be used for fast determination of the acceleration factor.We used it in the Luancheng hydrology experimental base in Shijiazhuang,and the results show that BP artificial neural network has been successfully used in solving the difficult problem, determination of the acceleration factor in the groundwater numerical simulation process.
In the present study we have examined effects of extracellular Ca2+ on osteoblast differentiation in MG-63 cells.Theresults showed that5.0mmol/L Ca2+ up-regulated the expression of CaSR , OC、ALP、Runx 2、IGF-1 ,and BMP 2 . However,these indicators decreased after treatment with blocking agents. In addition,5.0 and 10.0mmol/L Ca2+ increased phospho-ERK expression, but did not affect ERK.Therefore 5.0mmol/L Ca2+ up-regulated CaSR and then promoted osteoblast differentiation through ERK pathway in MG-63 cells.
We used the spatially explicit forest landscape model (LANDIS) to stimulate the long-term forest landscape change under pest disturbances with different intensities.The species area percents and age structures of Larch and White Birch and the species patterns were derived by using APACK. Results indicate that the pest disturbances led to a decrease in area percent of Larch cohorts and an increase in area percent of White Birch cohorts.The disturbances also led to a decrease in area of over-mature and mature cohorts of Larch and an increase in area of all age-cohorts of White Birch.We conclude that forest pest reduces the stability of forest ecosystem and leads to landscape fragmentation to some extent.
The growth and fruiting characteristics of two age X . sorbifolia bunge trees were studied with field observation and indoor experiment. The results showed that the number of fruit-setting per tree, the longitudinal and transverse diameter,and the thousand-seed weight of 8-year-old trees were all obviously larger than those of 50-year-old trees.The difference between the two age trees in the number of seeds per fruit was not significant( P >0.05).The total flower amounts of the young trees were 1.66 times amounts of the old trees.There was no significant difference in the proportion of female flowers between the two age trees,but the fruit setting rate of the old trees was significantly higher. The spring shoot increment of the young trees was obviously larger than that of the old trees. On the whole, there were significant differences in the growth and fruiting index between the two age trees,which was related to available nutrients in soil.
Based on the signal model of multi-baseline synthetic aperture radar (MB-SAR), the matrix function between the observed samples and the image in the height direction is obtained, and QR decomposition is used to solve the matrix equation.The 3D imaging algorithm based on QR decomposition for MB-SAR is established, and the simulation results are presented.
We propose a quality-driven algorithm for task scheduling in grid market, which is deadline- and budget-constrained and maximizes number of completed tasks (DBCN). This algorithm combines the high throughput advantage of Min-min algorithm and the global optimization advantage of linear programming. Meanwhile the algorithm considers not only all the tasks but also those prior ones. Compared with the Min-min and DBCT classical algorithms, DBCN completes about 10.6% and 22.0% more tasks and about 20% and 40% more prior tasks, respectively.
In this paper, the analytical formula of the quantization and saturation error induced by block adaptive quantization (BAQ) and Interception of High (IH) compression algorithms are derived. Moreover, the relationship between the standard deviation of input echo signal (SDIS) and the Signal-to-noise ratio (SNR) of these two compression algorithms is given. Finally, our method is verified by using simulated SAR raw data and real data, and is shown to be a good criterion for choosing SAR raw data compression ratio.
We report the design and implementation of CCSDS image data compression (IDC) parallel scheme based on FPGA. This scheme includes four modules: discrete wavelet transform(DWT), direct coefficient quantified encoding, bit plane encoding(BPE),and code processing. In order to put on speed, we use the parallel scanning and parallel encoding in the BPE module. The experimental results show the feasibility and efficiency of this scheme, and compared to the modified method of CCSDS IDC serial encoding, the processing time has reduced by 13.6%. Our scheme is fit for image data compression in the space communication.
We analyze the interconnection among WLAN, Internet, and Ku-band satellite communication networks. In order to meet the QoS requirements of the audio/video delivery, we have proposed an application-layer QoS control and testing method by using a frame rate and resolution adaptive modification algorithm. The simulation results show that the proposed method enhances the network utilization rate and has great QoS control capability of modifying the frame rate adaptively.
A full-length cDNA of an ArfGAP ( PaAGAP ) encoding 332 amino acids was cloned from Phytolacca acinosa by using methods of homology-based cloning and RACE. PaAGAP is predicted to contain a CX2CX16CX2C type zinc finger domain and a C2 domain. Real-time PCR analysis revealed that the expression of PaAGAP was up-regulated in response to low temperature, osmotic, salt, and heavy metal stresses, indicating a potential role of PaAGAP in the plant stress response that involves the inactivation of ARF and the inhibition of polar auxin transport.
Based on frequency de-ramping principle, we present a method of making the relationships between azimuth time and Doppler frequency in different modes identical, which creates opportunity for devising generalized processing for all modes, and the proposed algorithms are supported by simulated multi-mode SAR data.