A procedure for the analysis of gas adsorption measurements

A procedure is described for the analysis of gas adsorption measurements by the application of the BET and t method for the computation of textural     

A method for the calculation of eigenfunction expansions

In this paper, a method is presented for the calculation of the coefficients of the series expansion of a function f(t), in the base orthonormal set made up by the eigenfunctions of the self-adjoint operator $\text{L: L(x(t)) = (}\text{d}\text{dt}\text{)( p(t)(}\text{dx(t)}\text{dt}\text{))?q(t)x(t)}$. We show that the values of the numbers $\text{t}\text{}$x_k> can be obtained by solving the differential equation L + λ) y(t) = Kf(t), in the interval of definition, for each of the eigenvalues λ of L and by using as initial conditions those which determine one of its associated orthonormal functions. This makes the method specially interesting for its implementation on a hybrid computer: One advantage of the proposed method is that the analysis of f(t) does not require the simultaneous presence of the functions of the base set and the problem signal, thus eliminating both the problems of the synchronized generation of signals and the need for storing it in memory.     

A multiple measurements case-based reasoning method for predicting recurrent status of liver cancer patients

In general, the studies introducing the medical predictive models which frequently handle time series data by direct matching between pairs of features within sequences during calculation of similarity may have following limitations: (1) direct matching may not be a suitable matching because these paired cases by a fixed order may not be with the most similar temporal information, and (2) when two patients have different numbers of multiple cases, some cases may be ignored. For example, one patient with four cases and another one with five cases, only first four cases of these two patients are paired and the left one case may be ignored. In this paper, in order to dynamically determine matching pairs among cases and pair all cases between two patients, we propose a multiple measurements case-based reasoning (MMCBR) to be used for building liver cancer recurrence predictive models. MMCBR and single measurement case-based reasoning (SingleCBR) are evaluated and compared. According to experiment results in this study, the performance of MMCBR models is better than that of SingleCBR models. Multiple measurements accumulated during a period of time do have benefits for building predictive models with improved performance based on this proposed MMCBR method.     

A new method for estimating hand internal loads from external force measurements

This study examines using force vectors measured using a directional strain gauge grip dynamometer for estimating finger flexor tendon tension. Fifty-three right-handed participants (25 males and 28 females) grasped varying-sized instrumented cylinders (2.54, 3.81, 5.08, 6.35 and 7.62 cm diameter) using a maximal voluntary power grip. The grip force vector magnitude and direction, referenced to the third metacarpal, was resolved by taking two orthogonal grip force measurements. A simple biomechanical model incorporating the flexor tendons was used to estimate long finger tendon tension during power grip. The flexor digitorum superficialis and the flexor digitorum profundus were assumed to create a moment about the metacarpal phalange (MCP) joint that equals and counteracts a moment around the MCP joint measured externally by the dynamometer. The model revealed that tendon tension increased by 130% from the smallest size handle to the largest, even though grip force magnitude decreased 36% for the same handles. The study demonstrates that grip force vectors may be useful for estimating internal hand forces.     

A new method for estimating hand internal loads from external force measurements

This study examines using force vectors measured using a directional strain gauge grip dynamometer for estimating finger flexor tendon tension. Fifty-three right-handed participants (25 males and 28 females) grasped varying-sized instrumented cylinders (2.54, 3.81, 5.08, 6.35 and 7.62 cm diameter) using a maximal voluntary power grip. The grip force vector magnitude and direction, referenced to the third metacarpal, was resolved by taking two orthogonal grip force measurements. A simple biomechanical model incorporating the flexor tendons was used to estimate long finger tendon tension during power grip. The flexor digitorum superficialis and the flexor digitorum profundus were assumed to create a moment about the metacarpal phalange (MCP) joint that equals and counteracts a moment around the MCP joint measured externally by the dynamometer. The model revealed that tendon tension increased by 130% from the smallest size handle to the largest, even though grip force magnitude decreased 36% for the same handles. The study demonstrates that grip force vectors may be useful for estimating internal hand forces.     

一种三次均匀B样条曲线快速反算的方法

提出了均匀三次B-spline曲线反算的快速算法。在Matlab中编程实现,大大降低了程序的复杂性,提高了运算效率,并使重构所得曲线的两个端点处曲率不为零,满足了一阶连续,并给出了应用实例。     

Pattern recognition of nucleated cells from the peripheral blood

A data set consisting of 2259 nucleated cells from the peripheral blood, including immature cells, was systematically investigated using image processing and pattern recognition techniques. A total of 94.2% of all cells could be correctly classified into one of 9 possible main classes. Several subsets were also investigated. In particular, the cell types in the neutrophilic maturation sequence were extensively explored.     

VANET中一种链路稳定度的计算方法

在车用自组织网络VANET中,由于移动节点运动速度快且移动受道路拓扑约束等影响,导致链路容易断裂。路由选择是实现VANET的关键技术之一,没有高效的路由选择算法,VANET就无法工作,链路稳定度是衡量路由算法性能的重要因素。基于概率思想提出一种链路稳定度的计算方法来衡量链路的健壮性及可靠性。实验结果表明,所提出的链路稳定度计算方法是一种适合VANET场景的计算方法。     

用气体传感器数据求解煤制气报警器的设定浓度

本文详细介绍了如何根据气体传感器的气体特性数据来计算混合气浓度特性的方法.并以TGS822TF型传感器为例,详细介绍了以氢气设定、以CO浓度规定报警点的人工煤制气报警器设定浓度的计算方法.通过使用EXCEL对H2和CO的气体浓度特性数据进行处理,根据不同地区的人工煤制气的组分含量,即可计算当地煤制气报警器的设定浓度.     

A new calculation method for the worst case tolerance analysis and synthesis in stack-type assemblies

Productivity and industrial product quality improvements entail a rational tolerancing process to be applied as early as product design. Once functional conditions are defined, an optimal specification for each component in a mechanical system is to be developed. Despite numerous studies in this area, the problem is still far from solved. It may be decomposed into two stages: development of specifications based on standards, or qualitative synthesis, and calculation of tolerances. To the extent that these two sets of problems are related, we propose to address them in parallel. In this paper, we present an original method that enables us to solve these two problems for the case of serial assembly (stacking) without clearances. This method is based on the use of influence coefficients to obtain the relationship between the functional tolerance and the tolerances associated with the geometry of the mechanism’s interface surfaces. We will describe a calculation algorithm that helps obtain influence coefficients solely from the assembly’s geometric definition. Then, we will show that under our working hypothesis, this relationship is piecewise linear.     

大分子蠕动的Monte Carlo模型及计算方法

高分子链分子量巨大而且分散,结构复杂多变,存在大量不确定的问题,给理论和实验研究造成许多困难。本文建立了一种基于高分子Monte Carlo模拟算法,分析分子蠕动阻力的模型。用链动力学法构造8配位点键长涨落格子链多链体系,通过高分子链的运动使任意的初始有序态演化到平衡态,可同时获得体系的动态和静态性质。将重要性抽样法和高分子多链体系的链动力学构造法,在键长涨落模型中结合起来,形成多链体系的链动力学求解法。引入空格扩散算法,用以研究高浓度态的高分子体系。统计平衡后元胞内高分子多链体系在链动力学算法作用下蠕动失败机率,对高聚物多链体系内分子蠕动的困难程度的定量模拟,能更直观分析高分子玻璃化转变的现象。     

A closed-form method for the attitude determination using GNSS Doppler measurements

The fixing process for cycle ambiguity is a major issue for attitude determination using multiple Global Navigation Satellite System (GNSS) antennas. Existing algorithms have used pseudorange with large noise and ambiguity-included carrier phase measurements so the volume of the ambiguity search space is inevitably large. We propose a new algorithm to determine the attitude of a rotating vehicle using Doppler measurement in a closed form. Using differential and angular velocity estimation, we can reduce the size of the search space and the number of ambiguity candidates. We present simulation results using one master and two slave GNSS antennas. For all the cases in our simulations, the probability of one epoch fix is over 97%. Moreover, we achieved resolution of the ambiguity in two consecutive epochs. In other words, the maximum time-to-first-fixed-attitude (TTFFA) of our algorithm is only two seconds. Our algorithm can reduce the computation load in the ambiguity resolution for rotational vehicle attitude; consequently, it will be helpful in rapid and accurate determination in a case of phase lock loss due to a complex maneuver such as a fast spin.     

试论家用燃气报警器用气体传感器检定方法

针对家用燃气报警器用的气体传感器的检定方法,提出了不同于报警器检定的、完全针对传感器本身的特性评价的方案,包括检定用模块的规定、符号的规定等.特别是提出了如何使用传感器输出信号的数据,直接评价传感器的报警性能的方法.在此基础上,提出了如何根据报警器检定标准来评价传感器的合格范围,同时提出了对传感器的响应时间、环境试验、...     

一种Lyapunov指数算法及其实现

提出了一种利用周期轨道不同权重计算Lyapunov指数的算法。对混沌序列的周期轨道进行统计，并计算不同的周期轨道的Lyapunov指数，依据周期轨道的权重加权求和得到整个混沌吸引子的平均Lyapunov指数。深入讨论了初始值等对平均Lyapunov指数的影响。该算法不用舍去开始迭代点，适用于复杂混沌系统。     

A numerical method for optimizing the gas flow field in a centrifuge

The performance of a centrifuge which is used in the uranium enrichment industry depends strongly on the gas flow field inside the device. The flow, governed by linearized hydrodynamic equations, is activated by proper boundary conditions which are controllable functions. A numerical method is developed to determine these functions on the boundaries in order to optimize the separative performance. By expanding the control functions in a finite base, the problem is reduced to minimizing a function with respect to a finite number of variables and solved by the simplex method.