To identify factors that influence individual and group transmission of Chlamydia, the authors conducted community-wide contact tracing chlamydia cases in Colorado Springs, Colorado, from mid-1996 to mid-1997. Case patients identified persons with whom they had during 6 months preceding diagnosis; contacts were actively sought offered DNA amplification testing. Sexual networks used "source cases" "spread cases," permitting estimation basic reproduction number (R0) for individuals groups....

We quantified the stability of polystyrene- (PS-) grafted silica nanoparticles (NPs) in PS matrices with ultrasmall angle X-ray scattering (USAXS) and transmission electron microscopy (TEM) developed a phase diagram to predict NP dispersion based on graft polymer density, σ, free molecular weights, or N P, respectively. Using controlled/living polymerizations, nanocomposites were formulated NPs radius, R = 9 nm where σ 0.10–0.70 chains/nm2 at an essentially constant 61–68 kg/mol. The matrix...

1. The advantages of managing malignant pathological fractures in long bones by operative internal fixation is recognized. When conventional used, failures have resulted because extensive cortical bone lysis about the fracture site with consequent instability. 2. Thirty-one actual and two incipient thirty patients were managed augmented replacement locally resected tumor methylmethacrylate. 3. This method achieves immediate solid immobilization alleviation pain, early active joint motion,...

Ethylenediaminetetraacetic acid (EDTA) forms stable complexes with toxic metals such as cadmium. Metal-EDTA chelates are chemically and occur in a number of waste situations. The viability using photocatalytic oxidation titanium dioxide to degrade Cd-EDTA was examined at concentrations from 2 × 10-5 10-3 M pH 3 8. Initially portion the complex adsorbed onto TiO2 photocatalyst low pH. However, independent degree initial adsorption, rapidly destroyed little dependence on Concurrently, most...

Using dynamic light scattering, mechanical rheometry, and visual observation, the static wetting behavior of PDMS-grafted silica spheres (PDMS-g-silica) in PDMS melts is related to their rheology. A phase diagram mapped out for a constant grafted chain length as function grafting density free polymer length. The transition between stable aggregated regions determined optically with scattering. It associated first-order transition. In region Newtonian observed semidilute suspensions....

Composite materials consisting of nanoparticles dispersed in a polymer matrix have potential applications wide range fields. Grafting chains to is key strategy for controlling the distribution those throughout material. The particle controlled by relative length (P) graft (N) and density (σ) particles given radius (R). Using differential scanning calorimetry (DSC) bulk rheological measurements, we examine interactions between as function three parameters: σ, P, N. results these measurements...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrthoquinone complexes of vanadium and their reactions with molecular oxygenMarion E. Cass, David L. Green, Robert M. Buchanan, Cortlandt G. PierpontCite this: J. Am. Chem. Soc. 1983, 105, 9, 2680–2686Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Published inissue 1 1983https://pubs.acs.org/doi/10.1021/ja00347a027https://doi.org/10.1021/ja00347a027research-articleACS PublicationsRequest reuse permissionsArticle...

The wetting of PDMS-grafted silica spheres (PDMS- g-silica) is connected to their depletion restabilization in semidilute and concentrated PDMS/cyohexane polymer solutions. Specifically, we found that a diagram chemically identical graft free homopolymers predicts stability hard, semisoft, soft as function the bulk volume fraction, density, chain lengths. transition between stable aggregated regions determined optically with dynamic light scattering. point demarcation occurs when chains are...

Results are reported on the measurement of radiations from 2.55-min activity in ${\mathrm{P}}^{30}$, 32.40\ifmmode\pm\else\textpm\fi{}0.04 min ${\mathrm{Cl}}^{34}$ and 7.7-min ${\mathrm{K}}^{38}$ by means a large double-lens spectrometer NaI scintillation spectrometer. ${\mathrm{P}}^{30}$ has simple positron spectrum with end point at 3.24\ifmmode\pm\else\textpm\fi{}0.04 Mev no gamma rays or conversion electrons. complex points 4.50\ifmmode\pm\else\textpm\fi{}0.03...

Well-characterized dispersions of silica nanoparticles, stabilized by end-tethered poly(dimethylsiloxane) (PDMS) chains in PDMS melts have been investigated to better understand the impact graft layer on bulk properties. The relative "softness" completely wet, dispersed particles is examined varying melt molecular weight (P = 2–13 kg/mol) and particle core radius (ac 16–600 nm). As P decreases at constant (N 25 density (Σ ≈ 0.17 chains/nm2), enhanced stretching brush supported polymer...

We quantified the impact of carbon spacer length (CSL) immobilized alkoxysilanes initiators on grafting poly(methyl methacrylate) (PMMA) from surfaces monodisperse silica nanoparticles. PMMA was grafted using surface-initiated atom transfer radical polymerization (SI-ATRP), a facile technique to produce well-controlled polymer brushes. The polymerizations were carried out in environmentally friendly 4:1 (v/v) methanol−water solutions at room temperature. Monoethoxysilane 3, 11, and 15...

Using atom transfer radical polymerization (ATRP), we synthesized hybrid organic/inorganic nanoparticles consisting of a silica core and polystyrene brush. The brushes were grafted from the with three different initiators, termed 3-BIDS, 11-BIDS, 15-BIDS, respectively 3-, 11-, or 15-carbon spacer separating an ethoxylated silane brominated initiator end group. initiators characterized using 1H NMR 13C NMR. Surface modification studies all performed to optimize their attachment, producing...

Theory-based integrated modeling validated against DIII-D experiments predicts that fully non-inductive operation with βN > 4.5 is possible certain upgrades. IPS-FASTRAN a new iterative numerical procedure integrates models of core transport, edge pedestal, equilibrium, stability, heating, and current drive self-consistently to find steady-state (d/dt = 0) solutions reproduces most features high discharges stationary profile. Projecting forward scenarios on future upgrades, the qmin 2...

People with multiple sex partners tend to forget a significant proportion when recalling them.Randomized trial of supplementary interviewing techniques during routine partner notification contact interviews for chlamydia, gonorrhea, and syphilis in Colorado Springs, CO. Cases the last 3 months (n = 123) participated. Interviewers prompted nonspecifically read back list elicited after cases recalled on their own. We then randomly assigned receive 1 sets recall cues: (1) an experimental set...

This paper introduces a new artificial neural networks (ANNs)-based reverse-modeling approach for efficient electromagnetic compatibility (EMC) analysis of printed circuit boards (PCBs) and shielding enclosures. The proposed improves the accuracy conventional or standard models by reversing input-output variables in systematic manner, while keeping model structures simple relative to complex knowledge-based ANNs (e.g., KBNNs). facilitates accurate fast network modeling realistic EMC...

The Proto-MPEX helicon source has been operating in a high electron density 'helicon-mode'. Establishing plasma densities and magnetic field strengths under the antenna that allow for formation of normal modes fast-wave are believed to be responsible A 2D finite-element full-wave model on is used identify steady-state profile produced by source. We also show through simulation regions operation which core power deposition maximum slow-wave does not deposit significant besides directly...

The microstructure of polymer-grafted nanoparticles in polymer melts that are chemically identical to the brush was investigated using ultra-small angle X-ray scattering (USAXS). dispersions were thermodynamically stable. Particle size and melt molecular weight varied such particle softness, L*, or ratio thickness radius ranged from L* = 0.02–0.29. experimentally extracted structure factors radial distribution functions USAXS show stronger interactions lower due stretching corresponding an...

The Prototype Material Plasma Exposure Experiment at the Oak Ridge National Laboratory utilizes a variety of power systems to generate and deliver high heat flux plasma onto surface material targets. In experiments described here, deuterium is produced via ∼100 kW, 13.56 MHz RF helicon source, which ∼20 kW 28 GHz microwave applied. electron density temperature profiles are measured using Thomson scattering (TS) diagnostic, indicate that centrally peaked. core column, higher than cut-off...

Linear plasma devices, such as the Prototype Material Plasma Exposure eXperiment (Proto-MPEX), are an economic method to study plasma-material interactions under high heat and particle fluxes. The Proto-MPEX device at Oak Ridge National Laboratory is a high-density helicon generator with additional resonant electron heating in ITER-like conditions. Here, we present modeling results of Bernstein wave (EBW) scheme for this using microwave-based system. A 28 GHz injection system available...

We present time-resolved measurements of an edge-to-core power transition in a light-ion (deuterium) helicon discharge the form infra-red camera imaging thin stainless steel target plate on Proto-Material Exposure eXperiment device. The images measure two-dimensional distribution deposition discharge. displays mode characterized by significant increase on-axis electron density and core coupling, suppression edge formation fast-wave radial eigenmode. Although self-consistent mechanism that...

The objective of this retrospective study was to determine the optimal initial antibiotic regimen for hospital-acquired pneumonia using frequency and sensitivity Gram negative microorganisms found in sputum cultures. An antibiogram constructed compared with hospital intensive care unit (ICU) antibiogram. results yielded 191 microorganisms. study-generated showed that highest percent susceptible antibiotics all Gram-negative were imipenem (75%) amikacin (84%). Considering only Pseudomonas...