[Objective] The aim is to investigate the impact of different host plants, planting methods and directions on the damage law of Asterococcus muratae. [Method] The quantity of pests, size of female pests and quantity o...[Objective] The aim is to investigate the impact of different host plants, planting methods and directions on the damage law of Asterococcus muratae. [Method] The quantity of pests, size of female pests and quantity of ova of A. mu-ratae in Suzhou in different host plants under two planting methods and in four di-rections of a host plant were measured. [Result] A. muratae exhibits selectivity to host plants, and their quantity, female pest size and reproductive capacity are higher in Magnolia grandiflora（southern magnolia） than in other plants. The four directions of the host plant suffer to different extents, and the north part is usual y the most in-jured. Mass-planted southern magnolias are more seriously impacted than individual y-planted ones. Both size and weight of a female pest have significant linear relations with ovum quantity, and the weight of a female pest is more closely related to its ovum quantity. Based on the weight of a female pest, we can predict the exact ovum quantity according to the equation y=2E-05x＋0.003 7. [Conclusion] The research re-sults provide reference for making an effective control plan for A. muratae.展开更多
In order to solve serious urban transport problems, according to the proved chaotic characteristic of traffic flow, a non linear chaotic model to analyze the time series of traffic flow is proposed. This model recons...In order to solve serious urban transport problems, according to the proved chaotic characteristic of traffic flow, a non linear chaotic model to analyze the time series of traffic flow is proposed. This model reconstructs the time series of traffic flow in the phase space firstly, and the correlative information in the traffic flow is extracted richly, on the basis of it, a predicted equation for the reconstructed information is established by using chaotic theory, and for the purpose of obtaining the optimal predicted results, recognition and optimization to the model parameters are done by using genetic algorithm. Practical prediction research of urban traffic flow shows that this model has famous predicted precision, and it can provide exact reference for urban traffic programming and control.展开更多
AIM:To measure the normal space between the posterior wall of the vagina and the anterior wall of the respectively rectum using computed tomography(CT) and reveal its were relationship to rectocele. METHODS:A total of...AIM:To measure the normal space between the posterior wall of the vagina and the anterior wall of the respectively rectum using computed tomography(CT) and reveal its were relationship to rectocele. METHODS:A total of twenty female volunteers without rectocele were examined by CT scan.We performed a middle level continuous horizontal pelvic scan from the upper part to the lower part and collected the measurement data to analyze the results using t-test. RESULTS:Twenty volunteers were enrolled in the study. The space between the posterior wall of the vagina and the anterior wall of the rectum was measured at three levels(upper 1/3,middle,lower 1/3 level of vagina). The results showed that the space from the posterior wall of the vagina to the anterior wall of the rectum at the upper 1/3 level and the middle level was 3.896 ±0.3617 mm and 4.6575±0.3052 mm,respectively. When the two groups of data were compared,we found the space at the upper 1/3 level was shorter than at the middle level(P<0.01).Moreover,at the lower 1/3 level the space measured was 10.058±0.4534 mm.The results revealed that the space at the lower 1/3 level was longer than that at the middle level(P<0.01). CONCLUSION:These measurement data may be helpful in assessing rectocele clinical diagnosis and functional outcomes of rectocele repair.展开更多
There is a remarkable difference in stress distribution between a specimen and a plate removed from the specimen.The plate presents a uniform stress distribution whereas the specimen presents a non-uniform stress dist...There is a remarkable difference in stress distribution between a specimen and a plate removed from the specimen.The plate presents a uniform stress distribution whereas the specimen presents a non-uniform stress distribution.Firstly,the real stress distributions in plates with thickness of 30,40 and 50 mm and then in the specimens were obtained through simulation and X-ray surface stress measurement.Secondly,in order to study the impact of specimens shapes and processing ways on the results accuracy,two irregular shapes (parallelogram and trapezoid) and two processing ways (saw and electron discharge machining (EDM)) were compared and analyzed by simulation and experiment using layer removal method,then the specimen effects on measurement results were evaluated.The results show that:1) the non-uniform stress distribution characteristics of the specimen near the surface of the cut is significant,the range of non-uniform stress distribution is approximately one-thickness distance away from the cut,and it decreases gradually along the depth;2) In order to ensure the stability in the results,it is suitable to take the specimen plane size 2-3 times of its thickness;3) Conventional processing methods have little effect on experimental results and the average deviation is less than 5%.展开更多
It is well known that the Poincaré gauge theories of gravity do not have the structure of a standard gauge theory. Nevertheless, we show that a general form of action for the gravitational gauge fields in the gau...It is well known that the Poincaré gauge theories of gravity do not have the structure of a standard gauge theory. Nevertheless, we show that a general form of action for the gravitational gauge fields in the gauge theory does possess local Poincaré invariance.展开更多
Regularization method is an effective method for solving ill\|posed equation. In this paper the unbiased estimation formula of unit weight standard deviation in the regularization solution is derived and the formula i...Regularization method is an effective method for solving ill\|posed equation. In this paper the unbiased estimation formula of unit weight standard deviation in the regularization solution is derived and the formula is verified with numerical case of 1 000 sample data by use of the typical ill\|posed equation, i.e. the Fredholm integration equation of the first kind.展开更多
The presented iterative multiuser detection technique was based on joint deregularized and box-constrained solution to quadratic optimization with iterations similar to that used in the nonstationary Tikhonov iterated...The presented iterative multiuser detection technique was based on joint deregularized and box-constrained solution to quadratic optimization with iterations similar to that used in the nonstationary Tikhonov iterated algorithm.The deregularization maximized the energy of the solution,which was opposite to the Tikhonov regularization where the energy was minimized.However,combined with box-constraints,the deregularization forced the solution to be close to the binary set.It further exploited the box-constrained dichotomous coordinate descent algorithm and adapted it to the nonstationary iterative Tikhonov regularization to present an efficient detector.As a result,the worst-case and average complexity are reduced down as K2.8 and K2.5 floating point operation per second,respectively.The development improves the "efficient frontier" in multiuser detection,which is illustrated by simulation results.In addition,most operations in the detector are additions and bit-shifts.This makes the proposed technique attractive for fixed-point hardware implementation.展开更多
文摘[Objective] The aim is to investigate the impact of different host plants, planting methods and directions on the damage law of Asterococcus muratae. [Method] The quantity of pests, size of female pests and quantity of ova of A. mu-ratae in Suzhou in different host plants under two planting methods and in four di-rections of a host plant were measured. [Result] A. muratae exhibits selectivity to host plants, and their quantity, female pest size and reproductive capacity are higher in Magnolia grandiflora（southern magnolia） than in other plants. The four directions of the host plant suffer to different extents, and the north part is usual y the most in-jured. Mass-planted southern magnolias are more seriously impacted than individual y-planted ones. Both size and weight of a female pest have significant linear relations with ovum quantity, and the weight of a female pest is more closely related to its ovum quantity. Based on the weight of a female pest, we can predict the exact ovum quantity according to the equation y=2E-05x＋0.003 7. [Conclusion] The research re-sults provide reference for making an effective control plan for A. muratae.
文摘In order to solve serious urban transport problems, according to the proved chaotic characteristic of traffic flow, a non linear chaotic model to analyze the time series of traffic flow is proposed. This model reconstructs the time series of traffic flow in the phase space firstly, and the correlative information in the traffic flow is extracted richly, on the basis of it, a predicted equation for the reconstructed information is established by using chaotic theory, and for the purpose of obtaining the optimal predicted results, recognition and optimization to the model parameters are done by using genetic algorithm. Practical prediction research of urban traffic flow shows that this model has famous predicted precision, and it can provide exact reference for urban traffic programming and control.
基金Supported by The key project of Tianjin nature science foundation, China, No07JCZDJC07800
文摘AIM:To measure the normal space between the posterior wall of the vagina and the anterior wall of the respectively rectum using computed tomography(CT) and reveal its were relationship to rectocele. METHODS:A total of twenty female volunteers without rectocele were examined by CT scan.We performed a middle level continuous horizontal pelvic scan from the upper part to the lower part and collected the measurement data to analyze the results using t-test. RESULTS:Twenty volunteers were enrolled in the study. The space between the posterior wall of the vagina and the anterior wall of the rectum was measured at three levels(upper 1/3,middle,lower 1/3 level of vagina). The results showed that the space from the posterior wall of the vagina to the anterior wall of the rectum at the upper 1/3 level and the middle level was 3.896 ±0.3617 mm and 4.6575±0.3052 mm,respectively. When the two groups of data were compared,we found the space at the upper 1/3 level was shorter than at the middle level(P<0.01).Moreover,at the lower 1/3 level the space measured was 10.058±0.4534 mm.The results revealed that the space at the lower 1/3 level was longer than that at the middle level(P<0.01). CONCLUSION:These measurement data may be helpful in assessing rectocele clinical diagnosis and functional outcomes of rectocele repair.
基金Project(2005CB623708) supported by the National Basic Research Program of China
文摘There is a remarkable difference in stress distribution between a specimen and a plate removed from the specimen.The plate presents a uniform stress distribution whereas the specimen presents a non-uniform stress distribution.Firstly,the real stress distributions in plates with thickness of 30,40 and 50 mm and then in the specimens were obtained through simulation and X-ray surface stress measurement.Secondly,in order to study the impact of specimens shapes and processing ways on the results accuracy,two irregular shapes (parallelogram and trapezoid) and two processing ways (saw and electron discharge machining (EDM)) were compared and analyzed by simulation and experiment using layer removal method,then the specimen effects on measurement results were evaluated.The results show that:1) the non-uniform stress distribution characteristics of the specimen near the surface of the cut is significant,the range of non-uniform stress distribution is approximately one-thickness distance away from the cut,and it decreases gradually along the depth;2) In order to ensure the stability in the results,it is suitable to take the specimen plane size 2-3 times of its thickness;3) Conventional processing methods have little effect on experimental results and the average deviation is less than 5%.
基金supported by National Natural Science Foundation of China under Grant No.10675019
文摘It is well known that the Poincaré gauge theories of gravity do not have the structure of a standard gauge theory. Nevertheless, we show that a general form of action for the gravitational gauge fields in the gauge theory does possess local Poincaré invariance.
文摘Regularization method is an effective method for solving ill\|posed equation. In this paper the unbiased estimation formula of unit weight standard deviation in the regularization solution is derived and the formula is verified with numerical case of 1 000 sample data by use of the typical ill\|posed equation, i.e. the Fredholm integration equation of the first kind.
文摘The presented iterative multiuser detection technique was based on joint deregularized and box-constrained solution to quadratic optimization with iterations similar to that used in the nonstationary Tikhonov iterated algorithm.The deregularization maximized the energy of the solution,which was opposite to the Tikhonov regularization where the energy was minimized.However,combined with box-constraints,the deregularization forced the solution to be close to the binary set.It further exploited the box-constrained dichotomous coordinate descent algorithm and adapted it to the nonstationary iterative Tikhonov regularization to present an efficient detector.As a result,the worst-case and average complexity are reduced down as K2.8 and K2.5 floating point operation per second,respectively.The development improves the "efficient frontier" in multiuser detection,which is illustrated by simulation results.In addition,most operations in the detector are additions and bit-shifts.This makes the proposed technique attractive for fixed-point hardware implementation.
