Small-molecule organic compounds have emerged as attractive candidates for energy storage in lithium-ion batteries because of their sustainability and modularity. To develop generalizable design principles for organic electrode materials (OEMs), we investigated the correlation between electrochemical performance and addition of functional groups that promote synergistic hydrogen bonding and π−π stacking using a series of quinone-fused aza-phenazines (QAPs) with different hydrogen bonding donor/acceptor arrays. The QAP containing the most hydrogen bonding groups (3) exhibits the best performance with discharge capacities of 145 mAh g −1 at 2C and with 82% capacity retention over 1000 cycles. The performance of 3 is attributed to the strategically incorporated hydrogen bonding groups, which facilitate strong intermolecular interactions and a tightly packed 2D structure. The intermolecular interaction strength was evaluated using variable temperature 1D 1 H NMR and 2D 1 H− 1 H NOESY (nuclear Overhauser effect spectroscopy), offering a new strategy to help understand and predict the performance of OEMs with hydrogen bonding motifs.

Background: The acceptable noise level (ANL) is a measure of willingness to listen to speech in thepresence of background noise and is thought to be related to success with amplification. To date, ANLshave only been assessed over short periods of time, including within a session and over a three-week andthree-month time period. ANL stability over longer periods of time has not been assessed.<br />Purpose: The purpose was to examine the stability of ANL over a one-year time period.<br />Research Design: A repeated-measures, longitudinal study was completed.<br />Study Sample: Thirty young adults with normal hearing served as participants. The participants weretested at two different sites.<br />Data Collection and Analysis: Two trials of most comfortable listening levels (MCLs), background noiselevels (BNLs), and ANLs were assessed for each participant during three experimental sessions: at0 months, six months, and one year.<br />Results: Two-way repeated-measures analysis of variances revealed no significant change in MCLs,BNLs, or ANLs within a session or over a one-year time period. These results indicate that ANLs remainstable for one year in listeners with normal hearing.<br />Conclusions: The finding that the ANL is stable over a longer period of time supports the theory that theANL is an inherent trait of the listener and mediated at in the central auditory nervous system.<br />

Background The acceptable noise level (ANL) is a measurement used to quantify how much noise a person is willing to accept while listening to speech. ANL has been used to predict success with hearing aid use. However, physiological correlates of the ANL are poorly understood. One potential physiological correlate is the medial olivocochlear reflex (MOCR), which decreases the output of the cochlea and is thereby expected to increase noise tolerance. Purpose This study investigates the relationship between contralateral activation of the MOCR and tolerance of background noise. Research Design This study recruited 22 young adult participants with normal hearing. ANL was measured using the Arizona Travelogue recording under headphones presented at the most comfortable level (MCL) with and without multitalker babble noise. The MOCR strength was evaluated in all participants by measuring the cochlear microphonic (CM) with and without 40 dB sound pressure level contralateral broadband noise (CBBN). Data Analysis The CM observed in response to a 500-Hz tone was measured with and without CBBN, and changes in response to fast Fourier transform amplitude at 500 Hz were used as an indicator of the MOCR effect. The ANL was calculated by subtracting the maximum acceptable background noise level from the MCL. Participants were divided into two groups based on their ANL: low-ANL (ANL < 7 dB) and moderate-ANL (ANL ≥ 7 dB). An independent samples t-test was used to compare CM enhancement between low-ANL and moderate-ANL groups. Additionally, Pearson's correlation was used to investigate the relationship between the ANL and the MOCR effect on the CM. Results The results indicated that presentation of CBBN increased the CM amplitude, consistent with eliciting the MOCR. Participants in the low-ANL group had significantly larger CM enhancement than moderate-ANL participants. The results further revealed a significant correlation between the ANL and the MOCR effect on the CM. Conclusion This study suggests that a stronger MOCR, as assessed using CM enhancement, is associated with greater noise tolerance. This research provides a possible objective measure to predict background tolerance in patients and adds to our understanding about the MOCR function in humans.

Background: Acceptance of background noise serves as a means to predict likelihood of hearing aidsuccess. Individuals that are able to accept background noise are more likely to be successful with hearingaids.Purpose: The aim of the study was to assess the impact of sound enrichment on the acceptable noiselevel (ANL).Study Sample: Nineteen young adult participants served as listeners. Participants were randomlyassigned to the experimental or control group.Research Design: An experimental design with random assignment to experimental or control groupwas used.Data Collection and Analysis: One group used sound enrichment procedures for 2 weeks, whereas theother group served as a control group. Sound enrichment procedures required that participants add lowlevelbackground sound to any quiet environment encountered during the study. Most comfortable listeninglevel (MCL) and background noise level (BNL) were measured at three sessions, each 1 weekapart (baseline, after 1 week of treatment, and after 2 weeks of treatment).Results: Analytical statistics revealed that ANL improved for the sound enrichment group but remainedthe same for the control group. For both groups, there was no significant change in MCL across sessions.However, for the experimental group, BNL improved (increased) over the 2-week period while usingsound enrichment.Conclusions: Results of this study indicate that ANL can be improved with the use of sound enrichmentprocedures over a 2-week period. Future work should examine the use of sound enrichment proceduresfor older adults with hearing loss.

Small-molecule organic compounds have emerged as attractive candidates for energy storage in lithium-ion batteries due to their sustainability and modularity. To develop generalizable design principles for organic electrode materials (OEMs), we investigated the correlation between electrochemical performance and addition of functional groups that promote synergistic hydrogen bonding and π-π stacking using a series of quinone-fused aza-phenazines (QAPs) with different hydrogen bonding donor/acceptor arrays. The QAP containing the most hydrogen bonding groups (<b>3</b>) exhibits the best performance with discharge capacities of 145 mAh g^-1 at 2C with 82% capacity retention over 1000 cycles. The performance of <b>3</b> is attributed to the strategically incorporated -OH and -NH₂ groups, which facilitate strong intermolecular interactions and a tightly packed 2D structure. The intermolecular interaction strength was evaluated using variable temperature 1D ¹H NMR and 2D ¹H-¹H NOESY, offering a new strategy to help understand and predict the performance of OEMs with hydrogen bonding motifs.

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Background The acceptable noise level (ANL) is a measure of willingness to listen to speech in the presence of background noise and is thought to be related to success with amplification. To date, ANLs have only been assessed over short periods of time, including within a session and over a 3-week and 3-month time period. ANL stability over longer periods of time has not been assessed. Purpose The purpose was to examine the stability of ANL over a 1-year time period. Research Design A repeated-measures, longitudinal study was completed. Study Sample Thirty young adults with normal hearing served as participants. The participants were tested at two different sites. Data Collection and Analysis Two trials of most comfortable listening levels (MCLs), background noise levels (BNLs), and ANLs were assessed for each participant during three experimental sessions: at 0 months, 6 months, and 1 year. Results Two-way repeated-measures analysis of variances revealed no significant change in MCLs, BNLs, or ANLs within a session or over a 1-year time period. These results indicate that ANLs remain stable for 1 year in listeners with normal hearing. Conclusions The finding that the ANL is stable over a longer period of time supports the theory that the ANL is an inherent trait of the listener and mediated at in the central auditory nervous system.

Purpose The aim of this study was to assess the impact of transducer (loudspeaker, supra-aural headphones, and insert earphones) selection on the acceptable noise level (ANL). Study Sample Thirty young adults with normal hearing who reported difficulty with background noise served as participants. Research Design A repeated-measures experimental design was employed. Data Collection and Analysis Most comfortable listening level (MCL) and background noise level (BNL) were measured for all participants using three transducers (loudspeaker, supra-aural headphones, and insert earphones). ANL was computed as the difference between the mean MCL and the mean BNL. Results Analytical statistics revealed that ANL did not differ due to the transducer used. However, there were statistically significant differences found for MCL and BNL across transducers. Conclusions Results of this study indicate that ANL is not vulnerable to the selection of transducer and that ANLs can be compared across transducer types. Researchers should cautiously interpret findings across studies when discussing the base measures of MCL and BNL as these may be influenced slightly by transducer selection.