21 research outputs found

    Average AOD<sup>*</sup> in different spatio-temporal groups.

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    <p>The black line shows the AOD<sup>*</sup><sub>annual</sub> over the entire study region as a reference. The average AOD<sup>*</sup> during the heating season in the heating area was consistently higher than other spatio-temporal groups.</p

    Summary statistics of meteorological and social-economic parameters.

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    <p>Summary statistics of meteorological and social-economic parameters.</p

    Spatial distribution of average AOD*annual from 2004–2012.

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    <p>The blue line along the Qin Mountains and Huai River is the traditional dividing line between north and south China. AOD<sup>*</sup><sub>annual</sub> varied greatly across the study domain and north China has higher aerosol loading relative to south China generally.</p

    Estimates of parameters in the linear regression models.

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    <p><sup>a</sup>p-value< 0.01</p><p>Estimates of parameters in the linear regression models.</p

    Phase-Changing Bistable Electroactive Polymer Exhibiting Sharp Rigid-to-Rubbery Transition

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    A phase-changing polymer comprising stearyl acrylate and a long-chain urethane diacrylate was studied as a new bistable electroactive polymer. The abrupt and reversible phase transition of the crystalline aggregates of the stearyl moieties results in a rapid shift between the rigid and rubbery states of the polymers during temperature cycles. The transition temperature is tunable between 34–46 °C. A storage modulus change of ∌1000 fold can be obtained within a narrow temperature range of 10 °C. The polymer shows excellent shape memory properties with both fixation rate and recovery rate close to 100%. Diaphragm actuators based on the polymer thin films were electrically actuated up to 70% strain at 50 °C. The actuated shape can be “frozen” after the films were allowed to cool below the transition temperature. This rigid-to-rigid deformation is refreshable and repeatable via the rigid-to-rubbery transition and electrical actuation in the rubbery state

    Primary Product Branching in the Photodissociation of Chloroacetaldehyde at 157 nm

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    We used crossed laser-molecular beam scattering to study the primary photodissociation channels of chloroacetaldehyde (CH<sub>2</sub>ClCHO) at 157 nm. In addition to the C–Cl bond fission primary photodissociation channel, the data evidence two other photodissociation channels: HCl photoelimination and C–C bond fission. This is the first direct evidence of the C–C bond fission channel in chloroacetaldehyde, and we found that it significantly competes with the C–Cl bond fission channel. We determined the total primary photodissociation branching fractions for C–Cl fission:HCl elimination:C–C fission to be 0.65:0.07:0.28. The branching between the primary channels suggests the presence of interesting excited state dynamics in chloroacetaldehyde. Some of the vinoxy radicals from C–Cl photofission and most of the ketene cofragments formed in HCl photoelimination have enough internal energy to undergo secondary dissociation. While our previous velocity map imaging study on the photodissociation of chloroacetaldehyde at 157 nm focused on the barrier for the unimolecular dissociation of vinoxy to H + ketene, this work shows that the HCl elimination channel contributed to the high kinetic energy portion of the <i>m</i>/<i>z</i> = 42 signal in that study

    Trends in risk of multiple in-hospital clinical outcomes with increasing number of prior medications used.

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    <p>HR: heart rate; MACEs: major adverse cardiovascular events; OR: odd ratio; SBP: systolic blood pressure; STEMI: ST-segment elevation myocardial infarction;</p
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