排序方式: 共有11条查询结果,搜索用时 15 毫秒
1.
When conducting inferential and epidemiologic studies, researchers are often interested in the distribution of time until the occurrence of some specified event, a form of incidence calculation. Furthermore, this interest often extends to the effects of intervening factors on this distribution. In this paper we impose the assumption that the phenomena being investigated are governed by a stationary Markov chain and review how one may estimate the above distribution. We then introduce and relate two different methods of investigating the effects of intervening factors. In particular, we show how an investigator may evaluate the effect of potential intervention programs. Finally, we demonstrate the proposed methodology using data from a population study. 相似文献
2.
C.I. Calle P.J. Mackey M.D. Hogue M.R. Johansen H. Yim P.B. Delaune J.S. Clements 《Journal of Electrostatics》2013,71(3):257-259
Electrodynamic Dust Shields (EDS) have been in development at NASA as a dust mitigation method for lunar and Martian missions. An active dust mitigation strategy, such as that provided by the EDS, that can remove dust from surfaces, is of crucial importance to the planetary exploration program. We report on the development of a flight experiment to fully expose four EDS panels to the space environment. This flight experiment is part of the Materials International Space Station experiment X (MISSE-X), an external platform on the International Space Station that will expose materials to the space environment. 相似文献
3.
Rick Hogue 《Fresenius' Journal of Analytical Chemistry》1991,339(2):68-69
Conclusion The characteristics of the PM accessory allow reflecting measurements on a new variety of samples such as fruits, vegetables, tissue cultures, fermentation broths or reagent-impregnated dip sticks currently being developed for clinical laboratories. 相似文献
4.
Barrette J Bellwied R Braun-Munzinger P Cleland WE David G Duek E Fatyga M Fox D Gavron A Greene SV Hall J Hemmick TK Heifetz R Herman M Herrmann N Hogue RW Ingold G Jayananda K Kraus D Lissauer D Llope WJ Legault A Ludlam T Majka R Makowiecki D Mark SK Mitchell JT Muthuswamy M O'Brien E Olsen L Polychronakos V Rawool-Sullivan M Rotondo F Sandweiss J Shivakumar B Simon J Sonnadara U Sullivan JP Stachel J Sunier J Takai H Throwe T Van Hecke H Waters L Woody C Wolf K Wolfe D 《Physical review letters》1990,64(11):1219-1222
5.
The ongoing search for new electroactive materials for next-generation redox flow batteries has within the last decade encompassed metal–ligand coordination chemistry. Here, we review the handful of metal coordination complexes proposed as redox flow battery electrolytes. We highlight examples with careful ligand design, driving research towards higher energy density storage materials. Metal coordination complexes designed to be highly soluble not only in the initial redox state but also in all charged states accessed during the battery cycle give particularly impressive performances. Optimisation of flow cell conditions for metal coordination complexes remains largely unexplored, with most complexes screened in nonideal H-cell experiments with little investigation into membrane and electrode materials. 相似文献
6.
C.I. Calle P.J. Mackey M.D. Hogue M.R. Johansen J.D. Kelley J.R. Phillips J.S. Clements 《Journal of Electrostatics》2013,71(3):254-256
Human exploration missions to Mars will require the development of technologies for the utilization of the planet's own resources for the production of commodities. However, the Martian atmosphere contains large amounts of dust. The extraction of commodities from this atmosphere requires prior removal of this dust. We report on our development of an electrostatic precipitator able to collect Martian simulated dust particles in atmospheric conditions approaching those of Mars. Extensive experiments with an initial prototype in a simulated Martian atmosphere showed efficiencies of 99%. The design of a second prototype with aerosolized Martian simulated dust in a flow-through is described. 相似文献
7.
Ian D. Clark Andromeda J. Bruckman Christopher W. V. Hogue John P. MacManus Arthur G. Szabo 《Journal of fluorescence》1994,4(3):235-241
The Ca2+-binding protein oncomodulin was altered by cassette mutagenesis of the CD site (CDOM33) with a sequence that was derived by a consensus method using over 250 known Ca2+-binding loop sequences. This mutant was studied using time-resolved and steady-state fluorescence from the Trp residue included at position 7 of the loop (position 57 of the protein sequence). The fluorescence characteristics of this species in the absence and presence of metal ions were compared to those of a tetradecapeptide containing the loop and the single Trp mutant of oncomodulin, Y57W. The fluorescence properties of CDOM33 were quite different from the peptide, both in the apo form and in response to metal binding. The consensus CD loop in CDOM33 exhibited the characteristics of a Ca2+/Mg2+ site in contrast to the Ca2+ specificity of the wild-type CD loop. The Trp analogue, 5-hydroxytryptophan (5HW), was incorporated into both oncomodulin mutants to produce Y75(5HW) and 5HW-CDOM33. Results showed that this intrinsic probe was relatively insensitive to structural changes in the mutants upon metal binding compared to Trp itself. 相似文献
8.
In a previous work, the addition of basic screened Coulombic electrostatic forces to an existing commercial discrete element modeling (DEM) software was reported. Triboelectric experiments were performed to charge glass spheres rolling on inclined planes of various materials. Charge generation constants and the Q/m ratios for the test materials were calculated from the experimental data and compared to the simulation output of the DEM software. In this paper, we will discuss new values of the charge generation constants calculated from improved experimental procedures and data. 相似文献
9.
Barrette J Bellwied R Braun-Munzinger P Cleland WE Cormier T Dadusc G David G Dee J Diebold GE Dietzsch O Duek E Fatyga M Fox D Greene SV Germani JV Hall JR Hemmick TK Herrmann N Hogue RW Hong B Jayananda K Kraus D Kumar BS Lacasse R Lissauer D Llope WJ Ludlam TW Majka R Makowiecki D Mark SK Mitchell JT Muthuswamy M O'Brien E Pruneau C Rotondo FS Sandweiss J da Silva NC Simon-Gillo J Slaughter J Sonnadara U Stachel J Takai H Takagui EM Throwe TG Waters L Winter C Wolf K Wolfe D Woody CL Xu N 《Physical review letters》1993,70(12):1763-1766
10.
Research examining the nonlinear, dynamical-systems aspects of speech production and perception is reviewed. Examples are provided from studies of phonation, speech respiration, vocal tract acoustics, speech gestures, and auditory-phonetic perception. Results support a conclusion that nonlinear, dynamical system behaviors and principles are represented in speech production and perception at several levels of system behavior. The results are interpreted as suggesting that the communicative distinctions in speech are represented in task-relevant, order parameters which are preserved over a wide range of sets of task-irrelevant, control parameters. The control parameters, in turn, define the domains of behavior for each of the relevant acoustic, biological, or psychological systems. More specifically, it is proposed that speech order parameters may be understood in terms of collective variables defined, in production, over the degrees of, and opening/closing rates of, the vocal tract and, in perception, over the rates, amounts, and relative phases of the broad-band temporal modulations in speech signals. 相似文献