GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • SAGE Publications  (34)
  • 1
    Online Resource
    Online Resource
    Preparation and performance characterization of novel PVA blended with fluorinated polyimide membrane for gas separation
    SAGE Publications ; 2021
    In:  High Performance Polymers Vol. 33, No. 4 ( 2021-05), p. 394-404
    Details
    In: High Performance Polymers, SAGE Publications, Vol. 33, No. 4 ( 2021-05), p. 394-404
    Abstract: Fluorinated polyimide and PVA blending membranes were prepared by aqueous solution casting. We chose a poly (amic acid) ammonium salt (PAAS) in aqueous solution based on a novel green strategy as the PI precursor. The blending membranes were characterized by ATR-FTIR, DSC, TGA and gas permeation measurement. The ATR-FTIR analysis revealed that the imidization reaction of 6FPI based on aqueous precursor was completed at 180°C and hydrogen bonds formed between PVA and 6FPI. 6FPI showed good compatibility with PVA segment in blending membranes without obvious separated phase structure. The blending membranes showed high separation properties, for blending with 6FPI the gas separation performance stability was improved due to the hydrogen bonds between hydroxyl groups of PVA and carbonyl groups of 6FPI, and the rigid structure of 6FPI. At high operating pressure 10 bar, the CO 2 permeability and CO 2 /N 2 selectivity remained rather high. Using water as the solvent in the PAAS synthesis and membrane preparation is more environmentally friendly and less costly.
    Type of Medium: Online Resource
    ISSN: 0954-0083 , 1361-6412
    URL: Article
    DOI: 10.1177/0954008320959708
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 1483713-4
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Ni 2 P/Al 2 O 3 hydrodesulfurization catalysts prepared from hypophosphite under a nitrogen atmosphere
    SAGE Publications ; 2020
    In:  Progress in Reaction Kinetics and Mechanism Vol. 45 ( 2020-01), p. 146867831987764-
    Details
    In: Progress in Reaction Kinetics and Mechanism, SAGE Publications, Vol. 45 ( 2020-01), p. 146867831987764-
    Abstract: A novel method for preparing Ni 2 P/Al 2 O 3 (L) catalysts in an N 2 atmosphere by decomposition of hypophosphites was proposed, and Ni 2 P/Al 2 O 3 (T) catalyst was synthesized by the temperature programmed reduction method in a H 2 atmosphere for comparison. These prepared catalysts were washed with deionized water to remove impurities. The X-ray diffraction, N 2 -adsorption specific surface area measurements, CO uptake, and X-ray photoelectron spectroscopy were applied to characterize these catalysts. The activities of the Ni 2 P/Al 2 O 3 catalysts prepared with the two different methods were tested in the dibenzothiophene hydrodesulfurization reaction.
    Type of Medium: Online Resource
    ISSN: 1468-6783 , 1471-406X
    URL: Article
    DOI: 10.1177/1468678319877643
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2018085-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Predictors of Mechanical Thrombectomy for Anterior Circulation Emergent Large-Vessel Occlusion in the Older Adults
    SAGE Publications ; 2023
    In:  Clinical and Applied Thrombosis/Hemostasis Vol. 29 ( 2023-01)
    Details
    In: Clinical and Applied Thrombosis/Hemostasis, SAGE Publications, Vol. 29 ( 2023-01)
    Abstract: Few studies have reported the clinical outcomes of older adult patients with acute anterior circulation large-vessel occlusion (LVO) who underwent mechanical thrombectomy (MT). Therefore, we investigated the safety, functional outcomes, and predictors of MT for anterior circulation LVO in older adults. We enrolled patients with acute anterior circulation LVO from May 2018 to October 2021 in this retrospective study. Patients were divided into older (≥80 years) and young ( 〈 80 years) groups. Multivariable logistic regression analyses determined the safety, functional outcomes, and predictors of MT for anterior circulation LVO. We divided 1182 patients with acute ischemic stroke into young (18-79 years; 1028 patients) and older (≥80 years; 154 patients) groups. Compared with the young group, the older group had more unfavorable functional outcomes and increased mortality ( P = .003). In the older adult patients, lower initial NIHSS score and higher ASPECTS were correlated with good outcomes. On the contrary, higher initial NIHSS score and lower ASPECTS were related to increased mortality. No difference was detected in symptomatic intracranial hemorrhage within 48 h between two groups. Increasing age was associated with lower rates of favorable functional outcomes and higher mortality rates. The lower initial NIHSS score combined with the higher ASPECTS may predict functional outcomes post-thrombectomy in older adults.
    Type of Medium: Online Resource
    ISSN: 1076-0296 , 1938-2723
    URL: Article
    DOI: 10.1177/10760296231184219
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2023
    detail.hit.zdb_id: 2230591-9
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    A study of co-reaction mechanism and properties of propenyl-substituted monomer/bismaleimide system
    SAGE Publications ; 2016
    In:  High Performance Polymers Vol. 28, No. 10 ( 2016-12), p. 1172-1182
    Details
    In: High Performance Polymers, SAGE Publications, Vol. 28, No. 10 ( 2016-12), p. 1172-1182
    Abstract: A practical modifier, 4,4′-bis[2-(1-propenyl)phenoxy]benzophenone (MT), has been synthesized and copolymerized with 4,4′-bismaleimidodiphenylmethyene (4,4′-BMI) to yield a low-temperature cure bismaleimide resin. Structural information of MT was obtained using Fourier transform infrared spectroscopy and nuclear magnetic resonance (proton and carbon) spectroscopy, elemental, and mass spectrometry analyses. The differential scanning calorimetric curve of the MT/4,4′-BMI system shows two exothermic peaks at 164°C and 210°C, respectively. This value was compared with other polymerization reactions involving diallyl bisphenol A (DP) and diallyl bismaleimide (DBMI), with an exothermic peak at around 257°C. Unlike normal bismaleimide resins with DP postcured at 250°C for about 4–8 h, the MT/4,4′-BMI resin was cured at 230°C for a total of 6 h (i.e. MBMI-230) or at 200°C for 6 h (i.e. MBMI-200). Furthermore, the resins exhibit high thermal resistance, excellent mechanical properties, and exceptionally low dielectric loss. For MBMI-230 and MBMI-200, the dielectric loss values are all in the range of 0.0024–0.0054 from 7 GHz to 18 GHz and feature excellent thermal stabilities (5% weight loss temperature ( T d5 ) 〉 415°C under nitrogen atmosphere) and thermo-oxidative stabilities ( T d5 〉 425°C in air atmosphere). Additionally, the cured resins also display a high bending modulus ( 〉 3.2 GPa) at room temperature and an excellent mechanical stability at high temperature.
    Type of Medium: Online Resource
    ISSN: 0954-0083 , 1361-6412
    URL: Article
    DOI: 10.1177/0954008315621121
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2016
    detail.hit.zdb_id: 1483713-4
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Drug-Coated Balloon Angioplasty Compared With Uncoated Balloons in the Treatment of Infrapopliteal Artery Lesions (AcoArt II–BTK)
    SAGE Publications ; 2021
    In:  Journal of Endovascular Therapy Vol. 28, No. 2 ( 2021-04), p. 215-221
    Details
    In: Journal of Endovascular Therapy, SAGE Publications, Vol. 28, No. 2 ( 2021-04), p. 215-221
    Abstract: To compare the safety and efficacy of drug-coated balloon (DCB) vs uncoated balloon angioplasty in the treatment of de novo and restenotic infrapopliteal lesions in patients with chronic limb-threatening ischemia (CLTI). Materials and Methods The prospective, multicenter, randomized study AcoArt II–BTK study ( ClinicalTrials.gov identifier NCT02137577) enrolled 120 patients who were randomly assigned to angioplasty with either a DCB (n=61; mean age 70.7±7.4 years; 36 men) or a conventional balloon catheter (n=59; mean age 70.8±9.0 years; 36 men). There were no significant differences observed in baseline clinical or target lesion characteristics between the groups. The target lesion length was 169.95±86.35 mm in the DCB group vs 179.93±80.16 mm in the control group, and approximately three-quarters of the lesions were chronic occlusions. Primary patency was assessed by angiography at 6 months, and mortality and clinically-driven target lesion revascularization (CD-TLR) were evaluated at 12 months. Results Primary patency at 6 months was 75.0% in the DCB group and 28.3% in the control group (p 〈 0.001), while late lumen loss was 0.43±0.62 mm for DCBs vs 0.99±0.55 mm for controls (p 〈 0.001). Freedom from CD-TLR at 12 months was 91.5% in the DCB group vs 76.8% in the controls (p=0.03); there was no significant difference in mortality (1.7% DCB vs 3.6% controls; p=0.53). Conclusion This study demonstrated that the Litos/Tulip DCBs are safe and effective in treating infrapopliteal lesions, with improved angiographic and clinical outcomes vs plain balloon angioplasty. The DCBs demonstrated significantly higher primary patency with fewer CD-TLRs than conventional angioplasty. The safety of the DCBs was noninferior to that of the uncoated balloons after 1 year of follow-up.
    Type of Medium: Online Resource
    ISSN: 1526-6028 , 1545-1550
    URL: Article
    DOI: 10.1177/1526602820969681
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2049858-5
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    High-performance bismaleimide resins with low cure temperature for resin transfer molding process
    SAGE Publications ; 2017
    In:  High Performance Polymers Vol. 29, No. 3 ( 2017-04), p. 298-304
    Details
    In: High Performance Polymers, SAGE Publications, Vol. 29, No. 3 ( 2017-04), p. 298-304
    Abstract: High-performance bismaleimide resin systems (here coined LBMI resin series) based on 4,4-bismaleimidodiphenylmethane, 2,4-bismaleimidotoluene, bisphenol A bisallyl ether, 4,4′-bis[2-(1-propenyl)phenoxy]benzophenone, 2-allylphenol, and cumene hydroperoxide for resin transfer molding (RTM) process with low cure and post-cure temperatures (≦180°C) have been developed. Considering the optimum formulation conditions, the injection temperature is in the range of 70–160°C, and the pot life at 100°C is determined to be approximately 100 min. After curing at 180°C for 6 h, the resins exhibit high thermal resistances, excellent mechanical properties, and exceptionally low dielectric loss. Among others, these findings render the materials suitable for the use as high-performance resins for the production of advanced composites via RTM technique and with low cure temperatures.
    Type of Medium: Online Resource
    ISSN: 0954-0083 , 1361-6412
    URL: Article
    DOI: 10.1177/0954008316642278
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2017
    detail.hit.zdb_id: 1483713-4
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 7
    Online Resource
    Online Resource
    Vinyl-terminated butadiene acrylonitrile improves the toughness, processing window, and thermal stability of bismaleimide resin
    SAGE Publications ; 2017
    In:  High Performance Polymers Vol. 29, No. 10 ( 2017-12), p. 1199-1208
    Details
    In: High Performance Polymers, SAGE Publications, Vol. 29, No. 10 ( 2017-12), p. 1199-1208
    Abstract: Structural materials with excellent toughness, a wide processing window, outstanding mechanical performance, and high thermal stability are highly desired in engineering. This work reports a novel bismaleimide (BMI) resin system fabricated using bis[4-(4-maleimidephen-oxy)phenyl)]propane (BMPP), 1-(2-methyl-5-(2,5-dioxo-2H-pyrrol-1(5 H)-yl) phenyl)-1H-pyrrole-2,5-dione (BTM), and diallyl bisphenol A (DABPA) by a melt method. The behaviors of the BTM/BMPP/DABPA resin were modified by adding vinyl-terminated butadiene acrylonitrile (VTBN) in various amounts. The cured BTM/BMPP/DABPA/VTBN resin system exhibited all of the abovementioned desirable properties. Excellent performance was achieved by the post-cured BMI resin containing 6 phr of VTBN (VTBN-6). The glass transition temperature ( T g ) and the 5% weight loss temperature of VTBN-6 were 278°C and 408°C, respectively. Relative to VTBN-0 (BMI resin without VTBN), the impact strength of cured VTBN-6 (12.32 KJ/m 2 ) improved by 45.6%, and the fracture toughness values, K IC and G IC , increased by 48.7% and 26%, respectively. Moreover, the prepolymer of VTBN-6 exhibited low viscosity over a wide temperature range (70–200°C) under dynamic conditions and for an extended time (70 min; 75% improvement over VTBN-0) in an isothermal test. These results confirm the wide processing window of VTBN-6. The high toughness of the VTBN-containing BMI resin was compatible with other excellent performances of the modified resin.
    Type of Medium: Online Resource
    ISSN: 0954-0083 , 1361-6412
    URL: Article
    DOI: 10.1177/0954008316673418
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2017
    detail.hit.zdb_id: 1483713-4
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 8
    Online Resource
    Online Resource
    Non-isothermal curing kinetics, chemorheological behaviour, and IR spectral study of two trifunctional phenylethynyl-terminated imide oligomers compared with the corresponding bifunctional structure
    SAGE Publications ; 2016
    In:  Progress in Reaction Kinetics and Mechanism Vol. 41, No. 1 ( 2016-03), p. 1-13
    Details
    In: Progress in Reaction Kinetics and Mechanism, SAGE Publications, Vol. 41, No. 1 ( 2016-03), p. 1-13
    Abstract: Two trifunctional phenylethynyl-terminated imide oligomers, m-TPEPA and p-TPEPA, were systematically compared with the corresponding bifunctional phenylethynyl-terminated imide oligomer, BPEPA. The non-isothermal curing kinetics, Master Plots method, and rheological behaviour of the three high performance oligomers were systematically studied by dynamic DSC, small amplitude oscillatory shear rheometry, and infrared spectroscopy. The results show that the activation energy ( E a ) depended on the extent of conversion evaluated with three different methods, and the lower E a values of the trifunctional oligomers, which may lead to different curing reactions, compared with the sustained growth of E a values of BPEPA. The chemorheological properties of the oligomers were measured and fit numerically with the dual Arrhenius model and gel model. Moreover, the degree of cure (a gel ) at the gel time (t gel ) was calculated by the value of glass transform temperature at different curing temperature combined with rheological and isothermal DSC results. According to structural changes during the curing reaction characterised using FTIR spectra, it was inferred that the structures of the cured trifunctional imide resins have cis-configurations, which may change the part of the configuration from cis to trimerisation with the lower activation energies found in the later part of the conversion, while the difunctional imide structure is trans.
    Type of Medium: Online Resource
    ISSN: 1471-406X , 1471-406X
    URL: Article
    DOI: 10.3184/146867816X14544154610684
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2016
    detail.hit.zdb_id: 2018085-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 9
    Online Resource
    Online Resource
    Cognitive Dysfunction in Persons with Type 2 Diabetes Mellitus: A Concept Analysis
    SAGE Publications ; 2020
    In:  Clinical Nursing Research Vol. 29, No. 5 ( 2020-06), p. 339-351
    Details
    In: Clinical Nursing Research, SAGE Publications, Vol. 29, No. 5 ( 2020-06), p. 339-351
    Abstract: Although cognitive dysfunction is related to type 2 diabetes mellitus (T2DM), the concept has not yet been well defined. The purpose of this study was to define the concept of cognitive dysfunction in persons with T2DM and examine its defining attributes, antecedents, and consequences. Literature was retrieved from 2008 to 2018 by systematically searching the PubMed, CINAHL, and PsycINFO databases. Based on 37 included studies, three defining attributes were identified: cognitive dysfunction is a recognized or unrecognized symptom, is characterized by a subtle decline in one or more cognitive domains, and is accompanied by pronounced structural changes observed in brain imaging. One major antecedent was diabetes-related or diabetes-specific pathological changes. Consequences included interference with diabetes self-management, nonadherence to recommended self-management behaviors, and a higher risk of having hypoglycemic events. The concept analysis provides a theoretical foundation that can be used to guide evaluations and interventions related to cognitive dysfunction in individuals with T2DM.
    Type of Medium: Online Resource
    ISSN: 1054-7738 , 1552-3799
    URL: Article
    DOI: 10.1177/1054773819862973
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2020
    detail.hit.zdb_id: 2034682-7
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 10
    Online Resource
    Online Resource
    The Brain-Derived Neurotrophic Factor Functional Polymorphism and Hand Grip Strength Impact the Association between Brain-Derived Neurotrophic Factor Levels and Cognition in Older Adults in the United States
    SAGE Publications ; 2022
    In:  Biological Research For Nursing Vol. 24, No. 2 ( 2022-04), p. 226-234
    Details
    In: Biological Research For Nursing, SAGE Publications, Vol. 24, No. 2 ( 2022-04), p. 226-234
    Abstract: Aging is associated with subtle cognitive decline in attention, memory, executive function, processing speed, and reasoning. Although lower brain-derived neurotrophic factor (BDNF) has been linked to cognitive decline among older adults, it is not known if the association differs among individuals with various BDNF Val66Met (rs6265) genotypes. In addition, it is not clear whether these associations vary by hand grip strength or physical activity (PA). Methods A total of 2904 older adults were included in this study using data from the Health and Retirement Study. Associations between serum BDNF and measures of cognitive function were evaluated using multivariable linear regression models stratified by Met allele status. PA and hand grip strength were added to the model to evaluate whether including these variables altered associations between serum BDNF and cognition. Results Mean age was 71.4 years old, and mean body mass index was 28.3 kg/m 2 . Serum BDNF levels were positively associated with higher total cognitive score (beta = 0.34, p = .07), mental status (beta = 0.16, p = .07), and word recall (beta = 0.22, p =.04) among Met carriers, while serum BDNF levels were negatively associated with mental status (beta = −0.09, p = .07) among non-Met carriers. Furthermore, associations changed when hand grip strength was added to the model but not when PA was added to the model. Conclusions The BDNF Val66Met variant may moderate the association between serum BDNF levels and cognitive function in older adults. Furthermore, such associations differ according to hand grip strength but not PA.
    Type of Medium: Online Resource
    ISSN: 1099-8004 , 1552-4175
    URL: Article
    DOI: 10.1177/10998004211065151
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
    detail.hit.zdb_id: 2070503-7
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...