二装置并行搜索分解数为2的两个坏硬币平衡模型的统一测试过程

如何迅捷地从某类物品中搜索出具有给定特征的物品是一个有广泛实际背景的问题 .描述这一类问题的数学模型中 ,2台装置并行搜索 2个坏硬币的分解数为 2的 6个平衡模型Mi(i =1 ,2 ,… ,6 )最为常见 .然而至今为止 ,这 6个模型中仅有一个模型M1 的测试过程已给出 .本文采用二分测试树及深度优先算法 ,给出了这 6个平衡模型的统一测试过程t,使当k为奇数时 ,tk/nk =1 ,当k为偶数时tk/nk >0 .93 .这里tk 表示测试过程t在k次测试中所能鉴别的最大硬币数目 ,nk =maxtk.从而完全、统一地解决了分解数为 2之平衡模型的测试问题 .本文的结果可以直接应用于次品搜索。

一类广义超特殊p-群的因子分解数

设G是一个有限群,A,B是G的两个子群,若G=AB,则称G被A和B因子分解.设G是如下的一类广义超特殊p-群,G=<x,y,z|x^p=y^p=z^(p^m)=1,[x,z]=[y,z]=1,[x,y]=z^(p^(m-1))>,m≥1,则G的因子分解数被确定.

Cartan矩阵,分解数与单模的顶

设Ｂ是有限群Ｇ的ｐ－块代数，考虑以Ｂ的Ｂｒａｕｅｒ不可约特征标为基底生成的自由Ａｂｅｌ群，以及由Ｂ的Ｃａｒｔａｎ矩阵决定的这个群的商群．通过研究这个商群中元素的阶数，我们得到了Ｃａｒｔａｎ矩阵和Ｃａｒｔａｎ数与单模的顶点及亏群的一些新关系式．对于常不可约特征标的高度， 我们得到了它与分解数以及Ｃａｒｔａｎ不变量的一些新关系式．

不可摸数

计算出 5 0 0 0 0 0以下的不可摸数 735 6

一个最优搜索模型

给出了两台装置搜索两个坏硬币分解数为3之互补模型的一个测试过程 t，除了两个例外值 t_5/n_5＞0.93，t_7/n_7＞0.95外．成立 t_k/n_k＞0.96，这里 t_k 表示测试过程 t 在 k 次测试中所能鉴别的最大硬币数目，n_k＝maxt_k．

基于WPT和参数优化的VMD谐波检测方法

针对变分模态分解(Variational Mode Decomposition,VMD)在谐波检测中易受噪声影响、分解模态个数K难以确定的问题,提出一种基于小波包降噪(WPT)和参数优化的VMD谐波检测方法。利用WPT对谐波信号进行降噪处理,将降噪后信号进行VMD预分解,根据解析分量瞬时频率均值变化选取最优K值,对降噪后信号进行最优K值VMD分解并提取频率,采用希尔伯特变换进行幅值检测。仿真结果与对比表明,文章算法有效地降低了噪声影响,实现最优K值VMD分解,谐波参数检测精度有较好的提高。

用两台及三台装置搜索两个坏硬币的最优化方法

讨论了用给定装置从一堆硬币中用最少次数挑选出其中坏硬币的问题．以ｔｋ表示关于模型Ｎ的一个过程ｔ在ｋ次测试中所能鉴别的最大硬币数，以ｎｋ表示关于模型Ｎ在ｋ次测试中所能鉴别的最大硬币数．关于模型Ｂ３，给出了一个测试过程ｔｋ使得当ｋ≥２时，ｔｋ／ｎｋ＞０．９６且ｌｉｍｋ→∞ｔｋ／ｎｋ＝１．最后证明了文〔６〕作者的一个猜想．

Random noise attenuation by f–x spatial projection-based complex empirical mode decomposition predictive filtering

The frequency–space（f–x） empirical mode decomposition（EMD） denoising method has two limitations when applied to nonstationary seismic data. First, subtracting the first intrinsic mode function（IMF） results in signal damage and limited denoising. Second, decomposing the real and imaginary parts of complex data may lead to inconsistent decomposition numbers. Thus, we propose a new method named f–x spatial projection-based complex empirical mode decomposition（CEMD） prediction filtering. The proposed approach directly decomposes complex seismic data into a series of complex IMFs（CIMFs） using the spatial projection-based CEMD algorithm and then applies f–x predictive filtering to the stationary CIMFs to improve the signal-to-noise ratio. Synthetic and real data examples were used to demonstrate the performance of the new method in random noise attenuation and seismic signal preservation.

The filtering characteristics of HHT and its application in acoustic log waveform signal processing

Array acoustic logging plays an important role in formation evaluation. Its data is a non-linear and non-stationary signal and array acoustic logging signals have time-varying spectrum characteristics. Traditional filtering methods are inadequate. We introduce a Hilbert- Huang transform （HHT） which makes full preservation of the non-linear and non-stationary characteristics and has great advantages in the acoustic signal filtering. Using the empirical mode decomposition （EMD） method, the acoustic log waveforms can be decomposed into a finite and often small number of intrinsic mode functions （IMF）. The results of applying HHT to real array acoustic logging signal filtering and de-noising are presented to illustrate the efficiency and power of this new method.

On the growth of transcendental entire solutions of algebraic differential equations

In this paper, we investigate the growth of transcendental entire solutionsof the following algebraic differential equation a(z)f'~2 +(b_2(z)f^2 +b_1(z)f +b_0(z))f'=d_3(z)f^3+d_2(z)f^2 +d_1(z)f +d_0(z), where a(z), b_i(z) (0<- i <=2) and d_j (z) (0<=j<= 3) are allpolynomials, and this equation relates closely to the following well-known algebraic differentialequation C(z,w)w'~2 + B(z,w)w' + A(z,w) =0, where G(z,w)not ident to 0, B(z,w) and A(z,w) are threepolynomials in z and w. We give relationships between the growth of entire solutions and the degreesof the above three polynomials in detail.

ADRC FRACTIONAL ORDER PID CONTROLLER DESIGN OF HYPERSONIC FLIGHT VEHICLE

Active disturbance rejection controller（ADRC）uses tracking-differentiator（TD）to solve the contradiction between the overshoot and the rapid nature.Fractional order proportion integral derivative（PID）controller improves the control quality and expands the stable region of the system parameters.ADRC fractional order（ADRFO）PID controller is designed by combining ADRC with the fractional order PID and applied to reentry attitude control of hypersonic vehicle.Simulation results show that ADRFO PID controller has better control effect and greater stable region for the strong nonlinear model of hypersonic flight vehicle under the influence of external disturbance,and has stronger robustness against the perturbation in system parameters.

Thermal decomposition of ammonium hexafluoroaluminate and preparation of aluminum fluoride

The thermal decomposition process of （NH4）3AlF6 was studied by DTA-TGA method and the related thermodynamic data were obtained. The results show that AlF3 is obtained after three-step decomposition reaction of （NH4）3AlF6, and the solid products of the first two decomposition reactions are NH4AlF4 and AlF3（NH4F）0.69, respectively. The three reactions occur at 194.9, 222.5 and 258.4 ℃, respectively. Gibbs free energy changes of pertinent materials at the reaction temperatures were calculated. Enthalpy and entropy changes of the three reactions were analyzed by DSC method. Anhydrous aluminum fluoride was prepared. The XRD analysis and mass loss calculation show that AlF3 with high purity can be obtained by heating （NH4）3AlF6 at 400 ℃ for 3 h.

Reservoir detection based on EMD and correlation dimension

In hydrocarbon reservoirs, seismic waveforms become complex and the correlation dimension becomes smaller. Seismic waves are signals with a definite frequency bandwidth and the waveform is affected by all the frequency components in the band. The results will not define the reservoir well if we calculate correlation dimension directly. In this paper, we present a method that integrates empirical mode decomposition （EMD） and correlation dimension. EMD is used to decompose the seismic waves and calculate the correlation dimension of every intrinsic mode function （IMF） component of the decomposed wave. Comparing the results with reservoirs identified by known wells, the most effective IMF is chosen and used to predict the reservoir. The method is applied in the Triassic Zhongyou group in the XX area of the Tahe oil field with quite good results.

New signature scheme based on two cryptographic assumptions

In order to improve the security of the signature scheme, a digital signature based on two hard-solved problems is proposed. The discrete logarithm problem and the factoring problem are two well known hard- solved mathematical problems. Combining the E1Gamal scheme based on the discrete logarithm problem and the OSS scheme based on the factoring problem, a digital signature scheme based on these two cryptographic assumptions is proposed. The security of the proposed scheme is based on the difficulties of simultaneously solving the factoring problem and the discrete logarithm problem. So the signature scheme will be still secure under the situation that any one of the two hard-problems is solved. Compared with previous schemes, the proposed scheme is more efficient in terms of space storage, signature length and computation complexities.

Dynamic interacting relationships among international oil prices, macroeconomic variables and precious metal prices

From the perspective of long-term and short-term, the methods of TY causality test, generalized impulse response function, variance decomposition were used to investigate the impacts of international oil prices and macroeconomic variables on Chinese gold, silver and platinum prices, but also the feedback effects of Chinese precious metal prices under this impact. The results show that international oil prices play an important role in precious metal price variation both in long-term and short-term, and exchange rate only has an effect in short-term, while interest rate is ineffective in predicting precious metal prices. In addition, precious metal prices have some feedback effects on international oil prices and interest rate in short-term.

基层工会“拨交经费收入”应按全数记帐

在检查基层工会的财务帐目中,发现的有单位“拨交经费收入”帐户,不是记的2％全数。只记了2％的60％留用部分,“上解经费”帐户也没有支出数。这样处理帐务,不能正确反映本单位行政方面向工会拨交经费的实际数,没有“上解经费”支出,与上级工会所收的“拨交经费收入”数无法核对帐目。这是不符合全总财会制度要求的。按照全总《基层工会会计制度》规定,基层工会的会计科目——“拨交经费收入”帐户,应按行政拨交2％全数入帐;并按《六联缴款书》的分解数,60％留用部分记入“银行存款”帐户,40％是向上级工会交纳的经费,记入“上解经费”帐户,作支出处理。现将三种记帐方法的分录举例如下:

“落实难”剖析

《群众》杂志今年第四期发表了朱步楼同志的文章:《关键在于狠抓落实》。这个问题提得好!当前,上下抓落实的呼声很高。这不仅说明落实的重要,而且说明落实有难度。落实究竟难在哪里?我们不妨作些剖析。一种情况是,“雷声大雨点小”,抓头撂尾,形成落实难。当某项中心工作任务下来之后,层层开会,层层布置,层层都讲落实,可是谁去落实呢?采取什么具体措施去落实呢?落到何处才是实呢?往往含糊不清。无疑,落实要到基层。因为我们的工作最终都是为了群众,群众满意是衡量工作落实的标准。但是,这丝毫不意味着各级干部可以不尽职尽力去抓落实。如果把层层抓落实的责任都推给基层,那就无法保证落实不变成落空。事实上,落实在“雷声”中变形走样甚至步入误区,已经不是个别现象。比如,有的仅仅把开会当成落实,有的把发文件作为落实,有的把分解数字作为落实,有的把点上做了点事说成是整体面上的落实。凡此种种,表面看来像抓落实,而实际上没有抓下去,所谓“雷声阵阵,雨点可数”。

谈单车承包或租赁中应注意的几个问题

目前,全国各地交通企业都进行了单车承包或租赁的试点工作,并取得了一定的经验。但是,在试点工作中所出现的不少问题,应引起人们的注意。一、单车承包或租赁必须以第一层次的承包(即以企业向国家承包)为前提。

Geostress measurements near fault areas using borehole stress-relief method

To minimize negative effects of geostress distribution on mining safety near the fault areas, the UPM40 triaxial geostress testing system was introduced to conduct in-situ geostress measurements at three sites and nine points by the borehole stress-relief method. The results of strain?confining pressure curves show that rock masses at the three measuring sites exhibit comprehensive linear elasticity in spite of various fissures or cracks within rocks. Horizontal and vertical stress components distribute discrepantly near the fault areas, and the maximum lateral pressure coefficient is as high as 6.15. The maximum principle stress ranges from 8.01 to 14.93 MPa, and stress directions are in the range of N78.07°W?N17.55°W. Geostresses near fault areas are dominated by the horizontal tectonic stresses, while the lower values, compared to those under similar geological conditions are due to stress release by the fault. Additionally, the fault and shear stress nearby are partially responsible for asymmetric elongation and southwesterly migration of orebodies.

On Algebroid Solutions of Generalized Complex Differential Equations

Using the Nevanlinna theory of the value distribution of meromorphic functions, we investigate the existence problem of admissible algebroid solutions of generalized complex algebraic differential equations and obtain some results.