المؤلفون: Han, Jinfeng, Ganley, Connor, Hu, Qin, Zhao, Xingang, Clancy, Paulette, Russell, Thomas P, Katz, Howard E

المصدر: Advanced Functional Materials. 31(18)

مصطلحات موضوعية: Engineering, Macromolecular and Materials Chemistry, Materials Engineering, Chemical Sciences, complex dopants, high power factors, high Seebeck coefficient, n‐, type polymer thermoelectrics, Physical Sciences, Materials, Chemical sciences, Physical sciences

الوصف: A pre-formed Meisenheimer complex of a naphthalenediimide (NDI) with tetrabutylammonium fluoride (TBAF) is obtained in a simple way by mixing dibrominated 4,9-dibromo-2,7-bis(2-octyldodecyl)benzo[lmn][3,8]phenanthroline-1,3,6,8(2H,7H)-tetraone and TBAF in solution and used as a dopant for n-type organic thermoelectrics. Two n-type polymers PNDIClTVT and PBDOPVTT are synthesized, n-doped, and characterized as conductive and thermoelectric materials. PNDIClTVT doped with NDI-TBAF presents a high σ value of 0.20 S cm–1, a Seebeck coefficient (S) of −1854 µV K–1, and a power factor (PF) of 67 µW m–1 K–2, among the highest reported PF in solution-processed conjugated n-type polymer thermoelectrics. Using 4-(1,3-dimethyl-2,3-dihydro-1H-benzoimidazol-2-yl)phenyl)dimethylamine and NDI-TBAF as co-dopants, PNDIClTVT has a PF > 35 µW m–1 K–2; while for PBDOPVTT σ = 0.75 S cm–1 and PF = 58 µW m–1 K–2. In this study it is found that an ionic adduct together with a neutral dopant improves the performance of n-type organic thermoelectrics leading to an enhanced power factor, and more generally, the role of such an adduct in polymer doping is also elucidated.

وصف الملف: application/pdf

الوصول الحر: https://escholarship.org/uc/item/1616q273Test

المؤلفون: Doucet, Jay Joseph, Ferrada, Paula, Murthi, Sarah, Nirula, Ram, Edwards, Sara, Cantrell, Emily, Han, Jinfeng, Haase, Daniel, Singleton, Andrew, Birkas, Yekaterina, Casola, Giovanna, Coimbra, Raul

المصدر: Journal of Trauma and Acute Care Surgery. 88(1)

مصطلحات موضوعية: Biomedical and Clinical Sciences, Clinical Sciences, Clinical Research, Physical Injury - Accidents and Adverse Effects, Prevention, Adult, Aged, Central Venous Pressure, Female, Fluid Therapy, Hospitalization, Humans, Hypovolemia, Injury Severity Score, Male, Middle Aged, Predictive Value of Tests, Prospective Studies, ROC Curve, Resuscitation, Time Factors, Treatment Outcome, Ultrasonography, Vena Cava, Inferior, Wounds and Injuries, Trauma, ultrasound, shock, resuscitation, vena cava, AAST Multi-Institutional Trials Committee, Clinical sciences, Nursing

الوصف: BackgroundIdentification of occult hypovolemia in trauma patients is difficult. We hypothesized that in acute trauma patients, the response of ultrasound-measured minimum inferior vena cava diameter (IVCDMIN), IVC Collapsibility Index (IVCCI), minimum internal jugular diameter (IJVDMIN) or IJV Collapsibility Index (IJVCI) after up to 1 hour of fluid resuscitation would predict 24-hour resuscitation intravenous fluid requirements (24FR).MethodsAn NTI-funded, American Association for the Surgery of Trauma Multi-Institutional Trials Committee prospective, cohort trial was conducted at four Level I Trauma Centers. Major trauma patients were screened for an IVCD of 12 mm or less or IVCCI of 50% or less on initial focused assessment sonographic evaluations for trauma. A second IVCD was obtained 40 minutes to 60 minutes later, after standard-of-care fluid resuscitation. Patients whose second measured IVCD was less than 10 mm were deemed nonrepleted (NONREPLETED), those 10 mm or greater were repleted (REPLETED). Prehospital and initial resuscitation fluids and 24FR were recorded. Demographics, Injury Severity Score, arterial blood gasses, length of stay, interventions, and complications were recorded. Means were compared by ANOVA and categorical variables were compared via χ. Receiver operating characteristic curves analysis was used to compare the measures as 24FR predictors.ResultsThere were 4,798 patients screened, 196 were identified with admission IVCD of 12 mm or IVCCI of 50% or less, 144 were enrolled. There were 86 REPLETED and 58 NONREPLETED. Demographics, initial hemodynamics, or laboratory measures were not significantly different. NONREPLETED had smaller IVCD (6.0 ± 3.7 mm vs. 14.2 ± 4.3 mm, p < 0.001) and higher IVCCI (41.7% ± 30.0% vs. 13.2% ± 12.7%, p < 0.001) but no significant difference in IJVD or IJVCCI. REPLETED had greater 24FR than NONREPLETED (2503 ± 1751 mL vs. 1,243 ± 1,130 mL, p = 0.003). Receiver operating characteristic analysis indicates IVCDMIN predicted 24FR (area under the curve [AUC], 0.74; 95% confidence interval [CI], 0.64-0.84; p < 0.001) as did IVCCI (AUC, 0.75; 95% CI, 0.65-0.85; p < 0.001) but not IJVDMIN (AUC, 0.48; 95% CI, 0.24-0.60; p = 0.747) or IJVCI (AUC, 0.54; 95% CI, 0.42-0.67; p = 0.591).ConclusionUltrasound assessed IVCDMIN and IVCCI response initial resuscitation predicts 24-hour fluid resuscitation requirements.Level of evidenceDiagnostic tests or criteria, level II.

وصف الملف: application/pdf

الوصول الحر: https://escholarship.org/uc/item/63x2z8h6Test

المؤلفون: Han, Jinfeng, Jiang, Yufeng, Tiernan, Emma, Ganley, Connor, Song, Yunjia, Lee, Taein, Chiu, Arlene, McGuiggan, Patty, Adams, Nicholas, Clancy, Paulette, Russell, Thomas P, Hopkins, Patrick E., Thon, Susanna M., Tovar, John D., Katz, Howard E.

المساهمون: Division of Chemistry, Office of Naval Research

المصدر: Angewandte Chemie ; volume 135, issue 23 ; ISSN 0044-8249 1521-3757

الوصف: N‐Type thermoelectrics typically consist of small molecule dopant+polymer host. Only a few polymer dopant+polymer host systems have been reported, and these have lower thermoelectric parameters. N‐type polymers with high crystallinity and order are generally used for high‐conductivity ( ) organic conductors. Few n‐type polymers with only short‐range lamellar stacking for high‐conductivity materials have been reported. Here, we describe an n‐type short‐range lamellar‐stacked all‐polymer thermoelectric system with highest of 78 S −1 , power factor ( PF ) of 163 μW m −1 K −2 , and maximum Figure of merit ( ZT ) of 0.53 at room temperature with a dopant/host ratio of 75 wt%. The minor effect of polymer dopant on the molecular arrangement of conjugated polymer PDPIN at high ratios, high doping capability, high Seebeck coefficient ( S ) absolute values relative to , and atypical decreased thermal conductivity ( ) with increased doping ratio contribute to the promising performance.

الإتاحة: https://doi.org/10.1002/ange.202219313Test

المؤلفون: Liu, Yong, Liu, Qingjin, Zhao, Jia, Leng, Xuechen, Han, Jinfeng, Xia, Feng, Pang, Yazhi, Chen, Hong

المساهمون: National Natural Science Foundation of China, Natural Science Foundation of Chongqing

المصدر: Frontiers in Neuroscience ; volume 17 ; ISSN 1662-453X

مصطلحات موضوعية: General Neuroscience

الوصف: Introduction Chronic stress is a long-term condition that negatively affects cognitive ability and mental health. Individuals who experience chronic stress show poor attentional control. Transcranial direct current stimulation (tDCS) to the dorsolateral prefrontal cortex (DLPFC) modulates executive function domains. Therefore, it is beneficial to investigate whether tDCS of the DLPFC could improve attentional control and relieve stress in chronically stressed individuals. Methods We assess the event-related potentials (ERPs) associated with attentional control in individuals with chronic stress after the tDCS intervention. Forty individuals were randomly assigned to either the anodal tDCS group, which received 5 sessions of the 20 min tDCS over the DLPFC (2 mA; n = 20), or the sham tDCS ( n = 20). Participants’ stress levels, anxiety, depressive symptoms, and state affects were assessed and compared before and after the intervention. The ERP was collected through electroencephalography (EEG) technology during an attentional network test. Results After the anodal tDCS, we found a significant decrease in the perceived stress scale (PSS) scores (from an average score of 35.05 to 27.75), p = 0.01 as well as the State-Trait Anxiety Inventory (STAI) scores, p = 0.002. Better performance in the attentional network test, a significant reduction in the N2 amplitudes, and an enhancement in the P3 amplitudes (both cues and targets) were also found in the anodal tDCS group. Discussion Our study findings suggest that tDCS to the left DLPFC could effectively relieve chronic stress, potentially reflected by increased attentional control.

الإتاحة: https://doi.org/10.3389/fnins.2023.1182728Test

المؤلفون: Liu, Yong, Liu, Qingjin, Zhao, Jia, Leng, Xuechen, Han, Jinfeng, Xia, Feng, Pang, Yazhi, Chen, Hong

المصدر: Frontiers in Neuroscience ; volume 17 ; ISSN 1662-453X

مصطلحات موضوعية: General Neuroscience

الإتاحة: https://doi.org/10.3389/fnins.2023.1310092Test

المؤلفون: Huang, Yidan, Yu, Zhihao, Guo, Mingyu, Liu, Hao, Liu, Xianbin, Han, Jinfeng, Cui, Shaoping, Liu, Boqun, Zhao, Yingjie, Wei, Jinqiu, Liu, Bin, Chen, Siqi

المصدر: Catalysis Communications ; volume 178, page 106667 ; ISSN 1566-7367

مصطلحات موضوعية: Process Chemistry and Technology, General Chemistry, Catalysis

الإتاحة: https://doi.org/10.1016/j.catcom.2023.106667Test
https://api.elsevier.com/content/article/PII:S1566736723000699?httpAccept=text/xmlTest
https://api.elsevier.com/content/article/PII:S1566736723000699?httpAccept=text/plainTest

المؤلفون: Zhao, Qian, Liu, Qingling, Han, Jinfeng, Lu, Shuangchun, Su, Yun, Song, Chunfeng, Ji, Na, Lu, Xuebin, Ma, Degang, Cheung, Ocean

المصدر: Journal of chemical technology and biotechnology (1986). 94(12):3753-3762

مصطلحات موضوعية: Hydrotalcite-derived oxides, Acetone, Catalytic oxidation, Active oxygen species, Low-temperature reduction, Engineering Science with specialization in Nanotechnology and Functional Materials, Teknisk fysik med inriktning mot nanoteknologi och funktionella material

الوصف: Abstract BACKGROUND Acetone is a volatile organic compound (VOC) that is often associated with poor air quality. Acetone has chronic toxicity towards humans and has significant impact to the overall atmospheric air quality. In this study, several layer double oxides (with M2+ = Mg, Ni, Co or Mn and M3+= Al or Ce)were tested as catalyst in acetone oxidation. RESULTS MnAl-LDO was found to be the most efficient catalyst. 50% acetone conversion was achieved at 170 °C (T50%) and 90% conversion at 200 °C (T90%).The incorporation of Ce on MnCeAl-LDO did not improve its catalytic properties over MnAl-LDO (the T50% for MnCeAl-LDO was 12 °C higher than for MnAl-LDO). The good performance on MnAl-LDO was due to the presence of Mn3+. MnAl-LDO was not affect when water was introduced into the catalytic reaction setup. Less than 5 % fluctuation in the acetone conversion rate at 170 and 200 °C was detected in the presence of 5.5% water. The incorporation of Ce on CoCeAl-LDO improved its catalytic performance over CoAl-LDO (T50% of CoCeAl-LDO was 15 °C lower than CoAl-LDO).Our results showed that the good catalytic performance of CoCeAl-LDO was ascribed to the increased Co2+/Co3+ ratio and the abundance of lattice oxygen (Olatt). CONCLUSION MnAl-LDO has good catalytic properties for acetone oxidation, even under humid conditions. The LDO catalysts tested here can be developed into efficient catalysts for acetone oxidation and serve as functional materials for the reduction in acetone or VOC emission. This article is protected by copyright. All rights reserved.

وصف الملف: electronic

الوصول الحر: https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-366418Test
https://doi.org/10.1002/jctb.5868Test
https://uu.diva-portal.org/smash/get/diva2:1264561/FULLTEXT01.pdfTest

المؤلفون: Jiang, Yan^1,2 (AUTHOR), Han, Jinfeng^1,2 (AUTHOR), Xiao, Mingyue^1,2 (AUTHOR), Liu, Yong^1,2 (AUTHOR), Chen, Hong^1,2 (AUTHOR) chenhg@swu.edu.cn

المصدر: Current Psychology. Feb2024, Vol. 43 Issue 5, p4431-4442. 12p.

مصطلحات موضوعية: TIME pressure, COMPULSIVE eating, REWARD (Psychology), GOAL (Psychology), HABIT, CONTROL (Psychology), OBESITY

مستخلص: People with overweight and obesity consistently attempt to regulate their weight but typically fail to control their eating behaviors. Reward learning impairments have recently been utilized to explain the problem. According to dual-system theory, reward learning and performance depend on the balance between goal-directed and habitual behavioral control system. As the goal-directed control system need time to operate, time pressure was exploited to temporarily hinder the goal-directed control system and unmask latent habitual responses. In the present study, we evaluated the reward learning behaviors, particularly goal-directed and habitual responses, in individuals with overweight and obesity, and evaluated the effects of time pressure on the expression of habits. A total of sixty-eight overweight/obesity and lean undergraduates underwent four outcome-revaluation tasks in food or non-food context, and under no or high time pressure conditions. We found that compared to lean individuals, individuals with overweight/obesity showed more habitual responses toward both food and non-food reward under the high time pressure condition; however, there was no group difference in habitual responses under the no time pressure condition. These results indicate a deficit in the formation of goal-directed control or an overreliance on habits under time pressure among individuals with overweight and obesity. These results support the Habit Hypothesis for Overeating that overweight and obesity are related to habit-like eating behaviors, due to a maladaptive adjustment between the habit and the goal-directed behavioral control systems. As a result, further developments of habit-based interventions can benefit weight loss and long-term weight loss maintenance. [ABSTRACT FROM AUTHOR]

: Copyright of Current Psychology is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Han, Jinfeng, Zhuang, Kaixiang, Dong, Debo, Yang, Yingkai, Liu, Yong, He, Qinghua, Feng, Tingyong, Lei, Xu, Qiu, Jiang, Chen, Hong

المساهمون: China Postdoctoral Science Foundation, Fundamental Research Funds for the Central Universities, National Natural Science Foundation of China, National Social Science Fund of China

المصدر: Obesity ; volume 32, issue 2, page 291-303 ; ISSN 1930-7381 1930-739X

الوصف: Objective Overweight and obesity, as commonly indicated by a higher BMI, are associated with functional alterations in the brain, which may potentially result in cognitive decline and emotional illness. However, the manner in which these detrimental impacts manifest in the brain's dynamic characteristics remains largely unknown. Methods Based on two independent resting‐state functional magnetic resonance imaging data sets (Behavioral‐Brain Research Project of Chinese Personality, n = 1923; Human Connectome Project, n = 998), the current study employed a Hidden Markov model to identify the spatiotemporal features of brain activity states. Subsequently, the study examined the changes in brain‐state dynamics and the corresponding functional outcomes that arise with an increase in BMI. Results Elevated BMI tends to shift the brain's activity states toward a greater emphasis on a specific set of states, i.e., the metastate, that are relevant to the joint activities of sensorimotor systems, making it harder to transfer to the metastate of transmodal systems. These findings were reconfirmed in a longitudinal sample (Behavioral‐Brain Research Project of Chinese Personality, n = 34) that exhibited a significant increase in BMI at follow‐up. Importantly, the alternation of brain‐state dynamics specifically mediated the relationships between BMI and adverse functional outcomes, including cognitive decline and symptoms of mental illness. Conclusions The altered brain‐state dynamics within the sensorimotor‐to‐transmodal hierarchy provide new insights into obesity‐related brain dysfunctions and mental health issues.

الإتاحة: https://doi.org/10.1002/oby.23933Test

المؤلفون: Bai, Yang, Hao, Dapeng, Wei, Yingzhen, Han, Jinfeng, Li, Dan, Chen, Mengyang, Yu, Jihong

المساهمون: Higher Education Discipline Innovation Project, National Natural Science Foundation of China, National Key Research and Development Program of China

المصدر: Materials Chemistry Frontiers ; volume 8, issue 9, page 2142-2148 ; ISSN 2052-1537

الوصف: The copper-exchanged SUZ-4 zeolite with optimal compositions exhibits comparable catalytic properties to commercial Cu-SSZ-13 for the selective catalytic reduction reaction.

الإتاحة: https://doi.org/10.1039/d3qm00813dTest
http://pubs.rsc.org/en/content/articlepdf/2024/QM/D3QM00813DTest