Locating New Facilities with Respect to Existing Facilities

An efficient algorithm is presented for optimally locating new facilities with respect to existing facilities when movements between facilities are rectilinear. A cost-minimization objective is assumed. The algorithm has been programmed for a digital computer and large problems (500 existing and 100 new facilities) have been solved that illustrate the efficiency of the algorithm. An example problem is presented. Upper and lower bounds on the optimal value for direct (straight-line) movements are derived. Experience has shown that these bounds are relatively close.     

Sorption Power of the New Generation of Phytosorbents with Respect to Uranium

The sorption power of a new class of sorbents, phytosorbents, with respect to uranium was studied in model solution and real waters. Sorption was studied as influenced by the specific mass of the sorbent. The kinetic parameters of the sorption were determined, and diffusion inside the sorbent grain was identified as the limiting stage of the process. The diffusion coefficients were calculated; the exchange half-times were determined and confirmed. The uranium sorption was studied as influenced by pH. The maximal sorption of uranium is achieved at pH <4. The exchange capacities of the sorbents were determined.     

关于L2空间中权为e-x的Bernstein-Markov 不等式

本文求出了L2空间权为e-x的Bernstein-Markov不等式的渐进精确常数,即设pn(x)为(0,∞)上次数不超过n的代数多项式,则有∫∞0p12n(x)e-xdx＜[(2/π)2(n+1/2)2+1/4]∫∞0p2n(x)e-xdx且常数"(2/π)2","1/2"和阶"n2"已不可改进.     

Study of Standard Mica Capacitors with Respect to Time and Temperature

Standard mica capacitors manufactured by General Radio are widely used by National Metrology Institutes (NMIs) and other calibration laboratories. The temperature coefficient and stability of standard mica capacitors play significant role in precision measurement. This paper reports the study of standard mica capacitor (General Radio make) with respect to time and temperature. This study is useful for calibration laboratories while reporting measurement results in Proficiency Testing, Inter Laboratory Comparison programmes and calibration reports.     

集值函数关于实值单调非减函数的集值Riemann-Stieltjes积分

本文首先建立了集值函数关于实值单调非减函数的集值Riemann-Stieltjes积分,然后讨论了集值Riemann-Stieltjes积分的性质,给出了集值Riemann-Stieltjes可积的充要条件,最后引入集值Riemann-Stieltjes随机积分。     

The Effectiveness of Pulsed-Field Magnetization with Respect to Different Performance Bulk Superconductors

Pulsed-field magnetization (PFM) is one of the practical activation techniques for bulk applications, especially as an inexpensive, small-volume, and mobile experimental setup. To utilize the method, its effectiveness to excite the bulk superconductors was examined by four samples with different trapped-flux performance as representatives. The PFM experiments were conducted with a pair of vortex-type copper coils at liquid nitrogen temperature (77 K). The utmost trapped-flux performance of the four samples was obtained by a multi-PFM method with progressively increased applied fields. By comparison with their trapped-flux results of static field-cooling magnetization (FCM), the effectiveness of PFM according to different performance bulk superconductors was analyzed. It was found that with the improvement of the bulk performance, the PFM results start to deviate from the FCM ones more and more, indicating a harder tendency to excite the bulk samples by the PFM method. The possible explanations from heat generation during the pulse and some suggestions to the improvement of the PFM process for practical applications are discussed.     

A Robust Criterion for Checking the Uniformity of Two Non-Gaussian Samples with Respect to Variances

A robust F-criterion for checking the uniformity with respect to the variances of two non-Gaussian samples is obtained and investigated. Theoretical algorithms are developed and considered. The effectiveness and efficiency of the proposed criterion for known distribution kurtoses are illustrated using specific examples.__________Translated from Izmeritelnaya Tekhnika, No. 2, pp. 9–12, February, 2005.     

Extraction Properties of N-Decanoylmorpholine in Cyclohexane with Respect to U(VI)

Extraction of U(VI) from aqueous nitric acid with a new agent, N-decanoylmorpholine, in cyclohexane was studied. The influence on the distribution factor of the concentrations of nitric acid, extractant, and salting-out agent was discussed. The composition of the extractable species was determined, and the enthalpy of the extraction was calculated.     

Analysis and Design of a Flat Transducer Array Acousto-optic Deflector with Respect to the Second-order Diffraction

The diffraction of light by an acoustic wave generated by an oppositely phased transducer array is studied. Special attention is paid to the parasitic second-order diffraction which takes place in the usual deflector design at the frequency-band centre, and which results in a decrease in the first-order diffraction efficiency. On the basis of a simplified three-coupled-wave analysis, a modified deflector design is suggested which minimizes the diffraction efficiency dip in the deflector frequency-band centre.     

The Sensitivity of the Relative Effectiveness of Job Shop Dispatching Rules with Respect to Various Arrival Distributions

The study investigates the effects which various arrival rate distributions may have on the relative success of implementing various job shop heuristic dispatching rules. Sixteen different arrival rate distributions are tested on ten dispatching rules. General conclusions imply that the distribution with respect to shape and range of the arrival rate for incoming jobs is not a significant variable in evaluating the relative effectiveness of dispatching rules.     

A Note to Correct the Procedure of Pritsker and Ghare for Locating New Facilities with Respect to Existing Facilities

An author's correction to a procedure in which an algorithm was presented for optimally locating new facilities with respect to existing facilities when movements between facilities are rectilinear. Published December 1970.     

Complex Model of the Efficiency of Rectification Plates. 8. Comparison with Other Models with Respect to Experimental Data

A complex model is compared with the Murphree and Hausen models for the cases of concurrent and cross motion of vapor and liquid phases. Use is made of results of experimental studies involving separation of an acetic acidwater mixture and industrial data on rectification of furfurol and ethanol. It is proved that the efficiencies in the complex and Murphree models coincide as the coefficient of phase equilibrium m approaches unity but when this coefficient increases, the first model and the Hausen model coincide. The possibility of using the Murphree model at m 1 and the Hausen model at m is shown.     

Spatial dynamics of the 1918 influenza pandemic in England,Wales and the United States

There is still limited understanding of key determinants of spatial spread of influenza. The 1918 pandemic provides an opportunity to elucidate spatial determinants of spread on a large scale.To better characterize the spread of the 1918 major wave, we fitted a range of city-to-city transmission models to mortality data collected for 246 population centres in England and Wales and 47 cities in the US. Using a gravity model for city-to-city contacts, we explored the effect of population size and distance on the spread of disease and tested assumptions regarding density dependence in connectivity between cities. We employed Bayesian Markov Chain Monte Carlo methods to estimate parameters of the model for population, infectivity, distance and density dependence. We inferred the most likely transmission trees for both countries.For England and Wales, a model that estimated the degree of density dependence in connectivity between cities was preferable by deviance information criterion comparison. Early in the major wave, long distance infective interactions predominated, with local infection events more likely as the epidemic became widespread. For the US, with fewer more widely dispersed cities, statistical power was lacking to estimate population size dependence or the degree of density dependence, with the preferred model depending on distance only. We find that parameters estimated from the England and Wales dataset can be applied to the US data with no likelihood penalty.     

从耐腐蚀性能看高温熔铝坩埚的选材

在铸铁坩埚高温熔铝过程中,铁凝固时会形成脆性的α相和π相,显著降低铝合金的性能.通过对比试验探讨了铝液对4种材料铸铁坩埚的浸蚀,发现控制和减少铁埚熔铝中的含铁量十分重要;研究了不同钢铁材料在高温铝液下的浸蚀特点与规律,提出了钢铁材料中高碳相的形态与数量对其抗高温铝液浸蚀影响的特点,并对几种钢铁材料的抗铝液浸蚀能力进行了排序,为生产厂家选择铁埚材料提供了科学依据.