牛腺病毒3型(bovine adenovirus type 3,BAdV-3)为腺病毒科(Adenoviridae)哺乳动物腺病毒属(Mastadenovirus)的成员,为无囊膜包裹的线性双链DNA病毒,是导致牛呼吸道疾病的重要病原之一。本文就BAdV-3的生物学特性、流行情况、致病性、...牛腺病毒3型(bovine adenovirus type 3,BAdV-3)为腺病毒科(Adenoviridae)哺乳动物腺病毒属(Mastadenovirus)的成员,为无囊膜包裹的线性双链DNA病毒,是导致牛呼吸道疾病的重要病原之一。本文就BAdV-3的生物学特性、流行情况、致病性、检测技术等方面的研究进展进行综述,以期为后续科学研究以及BAdV-3相关疾病的有效防控提供参考。展开更多
Based on radon gas properties and its existing projects applications, we firstly attempted to apply geo- physical and chemical properties of radon gas in the field of mining engineering, and imported radioac- tive mea...Based on radon gas properties and its existing projects applications, we firstly attempted to apply geo- physical and chemical properties of radon gas in the field of mining engineering, and imported radioac- tive measurement method to detect the development process of the overlying strata mining-induced fractures and their contained water quality in underground coal mining, which not only innovates a more simple-fast-reliable detection method, but also further expands the applications of radon gas detection technology in mining field. A 3D simulation design of comprehensive testing system for detecting strata mining-induced fractures on surface with radon gas (CTSR) was carried out by using a large-scale 3D solid model design software Pro/Engineer (Pro/E), which overcame three main disadvantages of ''static design thought, 2D planar design and heavy workload for remodification design'' on exiting design for mining engineering test systems. Meanwhile, based on the simulation design results of Pro/E software, the sta- bility of the jack-screw pressure bar for the key component in CTSR was checked with a material mechan- ics theory, which provided a reliable basis for materials selection during the latter machining process.展开更多
三相电路谐波自适应逐相检测系统存在动态性能与稳态精度的矛盾,瞬时无功功率理论ip-iq运算方式的三相电路谐波检测系统中,三相谐波检测也直接受到直流分量分离的速度与稳态精度的影响。基于Least Mean Square(LMS)算法自适应理论,推导...三相电路谐波自适应逐相检测系统存在动态性能与稳态精度的矛盾,瞬时无功功率理论ip-iq运算方式的三相电路谐波检测系统中,三相谐波检测也直接受到直流分量分离的速度与稳态精度的影响。基于Least Mean Square(LMS)算法自适应理论,推导出自适应检测新型最佳迭代变步长算法,克服自适应算法的动态性能与稳态精度的矛盾,并且将该变步长算法分别运用于三相电路谐波逐相自适应检测与基于无功功率理论ip-iq运算的三相电路谐波检测直流量分离,提高三相谐波检测的质量。理论分析与仿真验证表明,新的迭代变步长算法可以改进三相电路谐波检测跟随性能与准确性能。展开更多
为提高用于有源电力滤波器APF(active power filter)的谐波电流检测的性能,提出一种基于自适应神经网络的谐波电流检测方法。根据自适应噪声对消技术的基本原理,将基波电流从负载电流中滤除从而得到谐波电流。该方法能实时准确地检测出...为提高用于有源电力滤波器APF(active power filter)的谐波电流检测的性能,提出一种基于自适应神经网络的谐波电流检测方法。根据自适应噪声对消技术的基本原理,将基波电流从负载电流中滤除从而得到谐波电流。该方法能实时准确地检测出谐波,很好地弥补基于FFT方法、基于瞬时无功理论方法和基于小波变换方法等检测方法的缺陷。MATLAB/Simulink仿真结果证明该方法的实时性和准确性,可用于APF的谐波电流检测。展开更多
文摘牛腺病毒3型(bovine adenovirus type 3,BAdV-3)为腺病毒科(Adenoviridae)哺乳动物腺病毒属(Mastadenovirus)的成员,为无囊膜包裹的线性双链DNA病毒,是导致牛呼吸道疾病的重要病原之一。本文就BAdV-3的生物学特性、流行情况、致病性、检测技术等方面的研究进展进行综述,以期为后续科学研究以及BAdV-3相关疾病的有效防控提供参考。
基金support for this work provided by the Fundamental Research Funds for the Central Universities(China University of Mining & Technology) (No. 2010ZDP02B02)the State Key Laboratory of Coal Resources and Safe Mining(No. SKLCRSM08X02)
文摘Based on radon gas properties and its existing projects applications, we firstly attempted to apply geo- physical and chemical properties of radon gas in the field of mining engineering, and imported radioac- tive measurement method to detect the development process of the overlying strata mining-induced fractures and their contained water quality in underground coal mining, which not only innovates a more simple-fast-reliable detection method, but also further expands the applications of radon gas detection technology in mining field. A 3D simulation design of comprehensive testing system for detecting strata mining-induced fractures on surface with radon gas (CTSR) was carried out by using a large-scale 3D solid model design software Pro/Engineer (Pro/E), which overcame three main disadvantages of ''static design thought, 2D planar design and heavy workload for remodification design'' on exiting design for mining engineering test systems. Meanwhile, based on the simulation design results of Pro/E software, the sta- bility of the jack-screw pressure bar for the key component in CTSR was checked with a material mechan- ics theory, which provided a reliable basis for materials selection during the latter machining process.
文摘三相电路谐波自适应逐相检测系统存在动态性能与稳态精度的矛盾,瞬时无功功率理论ip-iq运算方式的三相电路谐波检测系统中,三相谐波检测也直接受到直流分量分离的速度与稳态精度的影响。基于Least Mean Square(LMS)算法自适应理论,推导出自适应检测新型最佳迭代变步长算法,克服自适应算法的动态性能与稳态精度的矛盾,并且将该变步长算法分别运用于三相电路谐波逐相自适应检测与基于无功功率理论ip-iq运算的三相电路谐波检测直流量分离,提高三相谐波检测的质量。理论分析与仿真验证表明,新的迭代变步长算法可以改进三相电路谐波检测跟随性能与准确性能。
文摘为提高用于有源电力滤波器APF(active power filter)的谐波电流检测的性能,提出一种基于自适应神经网络的谐波电流检测方法。根据自适应噪声对消技术的基本原理,将基波电流从负载电流中滤除从而得到谐波电流。该方法能实时准确地检测出谐波,很好地弥补基于FFT方法、基于瞬时无功理论方法和基于小波变换方法等检测方法的缺陷。MATLAB/Simulink仿真结果证明该方法的实时性和准确性,可用于APF的谐波电流检测。
