Based on the ensemble learning method , the outliers are learned and deleted from the training corpus 本研究采用基于系综学习的野点学习方法剔除网页中的噪声样本，有效地提高了文本分类的性能。
As a well - received fact , entropy , the measurement of the disorder degree of a system , can indirectly be measured by thermodynamics 摘要从正则系综与巨正则系综的统计规律出发推导出了熵与宏观状态参量之间的关联。
When the density matrix of the whole ensemble consisted of system - meter is reduced to the microscopic physical system , the system trend quantum decoherence in nature 把由系统与仪器组成的系综的密度矩阵约化到被测系统部分，于是自然趋近量子退相干。
The rule of fluctuation of energy and pressure about canonical assemblages relativity quantum perfect gas under high temperature is given through strict theoretical inference and comparison with the theory on non - relativity 通过严格的理论推导，给出了正则系综高温条件下相对论量子理想气体的能量和压强的涨落规律，并与非相对论涨落进行了比较
Our main work is following : ( 1 ) a toy model of gravity in microcanonical ensemble is investigated according to generalized statistical mechanics which is more suitable to gravitating system because of its long range and non - extensive features 主要工作如下： ( 1 )基于引力系统的长程性和非广延性，根据广义统计力学用微正则系综来讨论引力toy模型。
In this paper , canonical ensemble theory is applied to investigate the second virial coefficient of a classical mixed gas and the limitative expression of the second virial coefficient formula is discussed ; in the meantime , the application of the investigation conclusion is put out 摘要本文应用正则系综理论研究了经典混合气体的第二维里系数，并讨论了各种极限情况，同时指出了所得结果的实际应用。
After studying the relation of distributive function and density matrix , the electron energy is calculated in magnetic field according to the distributive function in the thermodynamic statistical physics and the density matrix average value principle in the quantum mechanics , respectively 摘要研究正则系综中的配分函数与密度矩阵的关系，分别采用热力学统计物理中的配分函数和量子力学中的密度矩阵与平均值原理，计算电子在磁场中的能量。
In practice , this dissertation focuses on the study of the aforementioned two problems , we have investigated and analyzed the controlling mechanism of the adiabatic conditional geometric quantum phase - shift gates for two - qubit , and realized the geometric quantum computation by making use of the nonadiabatic geometric phase of quantum states of the superconducting josephson junctions quantum interference device system . we have also discussed the accessible information of quantum signal resource ensemble , and studied the teleportation of an arbitrary d - dimensional tv - particle unknown state via a partially - entangled quantum channel ; this dissertation comes in four parts 实际上，我们在本文中就上述两方面的问题作了一些探讨：研究和分析了两量子位绝热条件几何量子相移门的控制机制，利用超导约瑟夫森结量子器件系统的量子态的非绝热几何相位实现了几何量子计算、讨论了信源系综的可接收信息问题以及任意d维n粒子未知量子态通过部分纠缠量子信道的隐态传输问题等。
At a definite temperature a mesoscopic circuit isnt in a determinate quantum state instead of in the mixed state ( or statistical state ) . using the density matrix of the canonical ensemble , we have deduced the formulate of the quantum fluctuations of both charge and current in a non - dissipative mesoscopic coupled circuit . and the dependences of the quantum fluctuation of the circuit on its temperature have obtained 在有限温度下，介观电路系统实际上并不处在一个确定的量子状态，而是处在混合态.根据正则系综的密度矩阵导出耦合互感电路中电荷和电流的量子涨落，得到了量子涨落与温度的依赖关系
In order to avoid the limit of the uncertainty relation , we will compare the classical and quantum in the ensemble kinesis - levels . there is a time scale te . in thequantum ensemble distribute corresponding to the chaotic character of the ensemble distribute in classical phase space , if t > te , the quantum effect will restrict the increase of the degree of ensemble distribute irregularity 为了不受量子力学中不确定关系的限制，在系综运动层次上对经典和量子动力学作比较，得到经典系综相空间分布的混沌特征，在相应的量子系综分布的运动中存在一个时间尺度t _ e ，当t t _ e时，量子效应使得系综分布不均匀度得增长受到抑制。
