To evaluate the clinical significance of clinical staging and magnetic resonance imaging (MRI) staging for prostate cancer before radical prostatectomy. Methods: Thirty-two patients with organ confined prostate cancer...To evaluate the clinical significance of clinical staging and magnetic resonance imaging (MRI) staging for prostate cancer before radical prostatectomy. Methods: Thirty-two patients with organ confined prostate cancer were reviewed to assess the accuracy of clinical staging and MRI staging to correlate with pathological staging results after radical prostatectomy. Results: 33.3% (10/30) prostate cancer patients with staging C and 3.3% (1/30) prostate cancer patients with staging D were diagnosed by pathology after radical prostatectomy in 30 patients with prostate cancer with clinical staging B, and 36.7% (11/30) under staging; Only one patient was over staging in clinical staging C. 19.1% (4/21) prostate cancer patients with staging C were diagnosed in 21 patients with prostate cancer and under staging with MRI staging B; 11.1% (1/9) was over staging with MRI staging C. The clinical staging and MRI staging had more correlation with pathological staging results (P=0.002), and PPV of the organ confined prostate cancer by clinical staging and MRI staging were 63.3% and 80.9% respectively, and NPV of nonorgan confined prostate cancer by clinical staging and MRI staging were 50% and 88.9% respectively. MRI staging was more specificity and accuracy than that of clinical staging to predict pathological staging results before radical prostatectomy (P=0.023). Conclusion: The MRI staging was more accuracy than that of clinical staging to predict pathological staging results in organ confined and nonorgan confined prostate cancer before radical prostatectomy.展开更多
This paper presents two kind to pologies of newtype single-stage inverter with half-bridge and push-pull con-struction.The half-bridge single-stage DC/AC topo-logyis suited for high input voltage,and the push-pull sin...This paper presents two kind to pologies of newtype single-stage inverter with half-bridge and push-pull con-struction.The half-bridge single-stage DC/AC topo-logyis suited for high input voltage,and the push-pull single stage DC/AC topology is suited for low input voltage.The principles lf the two topologies are introduced.Ths-oretical and experimental results verify that they are suit-ed for small power DC/AC applications because of the ex-cellent performances such as simple construction,smallvolume,light weight and high reliability.展开更多
Consider a semiparametric regression model with linear time series errors Yk=x'kβ+g(tk)+εk,1≤k≤n,where Yk's are responses,xk=(xk1，xk2，…,xkp)' and tk∈T包含R are fixed design points,β=(β1,β2,…,β...Consider a semiparametric regression model with linear time series errors Yk=x'kβ+g(tk)+εk,1≤k≤n,where Yk's are responses,xk=(xk1，xk2，…,xkp)' and tk∈T包含R are fixed design points,β=(β1,β2,…,βp)'is an unknown parameter vector,g(·)is an unknonwn bounded real-valued function defined on a compact subset T of the real line R,and εk is a linear process given by εk=∑j=0^∞ψjek-j,ψ0=1,where ∑j=0^∞|ψj|<∞,and ej,j=0,±1,±2,…,are i.i.d.random variables.In this paper we establish the asymptotic normality of the least squares estimator of β,a smooth estimator of g(·),and estimators of the autocovariance and autocorrelation functions of the linear process εk.展开更多
Bi2WTi3O12 ceramics are fabricated by the conventional solid-state reaction process. With increasing temperature the sample first has metallic behavior, then strong electrical fluctuations above 100℃, and finally exh...Bi2WTi3O12 ceramics are fabricated by the conventional solid-state reaction process. With increasing temperature the sample first has metallic behavior, then strong electrical fluctuations above 100℃, and finally exhib-its stable nonlinear properties characterized by semiconduc-tivity above 300℃ at low field (E ≤ 100 V/mm). The Ar-rhenius law for electrical conductivity by thermal activation is not suitable to explain the anomalous results. XRD analysis reveals that Bi2WO6 is the main phase and Bi4Ti3O12 is the second phase. Based on the phase transition of tungsten tri-oxide from room temperature to about 300℃, the electrical properties of Bi2WTi3O12 ceramics can be explained.展开更多
文摘To evaluate the clinical significance of clinical staging and magnetic resonance imaging (MRI) staging for prostate cancer before radical prostatectomy. Methods: Thirty-two patients with organ confined prostate cancer were reviewed to assess the accuracy of clinical staging and MRI staging to correlate with pathological staging results after radical prostatectomy. Results: 33.3% (10/30) prostate cancer patients with staging C and 3.3% (1/30) prostate cancer patients with staging D were diagnosed by pathology after radical prostatectomy in 30 patients with prostate cancer with clinical staging B, and 36.7% (11/30) under staging; Only one patient was over staging in clinical staging C. 19.1% (4/21) prostate cancer patients with staging C were diagnosed in 21 patients with prostate cancer and under staging with MRI staging B; 11.1% (1/9) was over staging with MRI staging C. The clinical staging and MRI staging had more correlation with pathological staging results (P=0.002), and PPV of the organ confined prostate cancer by clinical staging and MRI staging were 63.3% and 80.9% respectively, and NPV of nonorgan confined prostate cancer by clinical staging and MRI staging were 50% and 88.9% respectively. MRI staging was more specificity and accuracy than that of clinical staging to predict pathological staging results before radical prostatectomy (P=0.023). Conclusion: The MRI staging was more accuracy than that of clinical staging to predict pathological staging results in organ confined and nonorgan confined prostate cancer before radical prostatectomy.
文摘This paper presents two kind to pologies of newtype single-stage inverter with half-bridge and push-pull con-struction.The half-bridge single-stage DC/AC topo-logyis suited for high input voltage,and the push-pull single stage DC/AC topology is suited for low input voltage.The principles lf the two topologies are introduced.Ths-oretical and experimental results verify that they are suit-ed for small power DC/AC applications because of the ex-cellent performances such as simple construction,smallvolume,light weight and high reliability.
基金CHEN Min's work is supported by Grant No. 70221001 and No. 70331001 from NNSFC and Grant No. KZCX2-SW-118 from CAS.
文摘Consider a semiparametric regression model with linear time series errors Yk=x'kβ+g(tk)+εk,1≤k≤n,where Yk's are responses,xk=(xk1，xk2，…,xkp)' and tk∈T包含R are fixed design points,β=(β1,β2,…,βp)'is an unknown parameter vector,g(·)is an unknonwn bounded real-valued function defined on a compact subset T of the real line R,and εk is a linear process given by εk=∑j=0^∞ψjek-j,ψ0=1,where ∑j=0^∞|ψj|<∞,and ej,j=0,±1,±2,…,are i.i.d.random variables.In this paper we establish the asymptotic normality of the least squares estimator of β,a smooth estimator of g(·),and estimators of the autocovariance and autocorrelation functions of the linear process εk.
文摘Bi2WTi3O12 ceramics are fabricated by the conventional solid-state reaction process. With increasing temperature the sample first has metallic behavior, then strong electrical fluctuations above 100℃, and finally exhib-its stable nonlinear properties characterized by semiconduc-tivity above 300℃ at low field (E ≤ 100 V/mm). The Ar-rhenius law for electrical conductivity by thermal activation is not suitable to explain the anomalous results. XRD analysis reveals that Bi2WO6 is the main phase and Bi4Ti3O12 is the second phase. Based on the phase transition of tungsten tri-oxide from room temperature to about 300℃, the electrical properties of Bi2WTi3O12 ceramics can be explained.
