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  1. Article: Ionized o-, m-, and p-difluorobenzene dissociate through ring-opened intermediates: a TPEPICO investigation.

    Boulanger, Anne-Marie / Holland, David M P / Shaw, David A / Mayer, Paul M

    Journal of the American Society for Mass Spectrometry

    2009  Volume 20, Issue 1, Page(s) 20–24

    Abstract: Threshold photoelectron photoion coincidence (TPEPICO) experiments have shown that o-, m-, and p ... for the initial isomerization of 4.48 +/- 0.05, 4.55 +/- 0.05, and 4.68 +/- 0.05 eV for o-, m-, and p ... difluorobenzene ions dissociate via a common, ring-opened intermediate and not via ionized p-difluorobenzene. Rice ...

    Abstract Threshold photoelectron photoion coincidence (TPEPICO) experiments have shown that o-, m-, and p-difluorobenzene ions dissociate via a common, ring-opened intermediate and not via ionized p-difluorobenzene. Rice-Ramsperger-Kassel-Marcus (RRKM) modeling of the experimental breakdown curves yields activation energies for the initial isomerization of 4.48 +/- 0.05, 4.55 +/- 0.05, and 4.68 +/- 0.05 eV for o-, m-, and p-difluorobenzene, respectively. These values place each ion at a similar absolute energy and thus similar transition states. A large positive DeltaS(double dagger) for each ion (ca 100 J K(-1) mol(-1)) suggests a ring-opened structure for these transition states.
    Language English
    Publishing date 2009-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1073671-2
    ISSN 1044-0305
    ISSN 1044-0305
    DOI 10.1016/j.jasms.2008.09.020
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 4618: Show issues Location:
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    Zs.MO 241: Show issues

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  2. Article: Hunting the P. M., country style

    Curnow, Ross / Mayer, Henry

    Australian quarterly : AQ Vol. 40, No. 4 , p. 57-70

    1968  Volume 40, Issue 4, Page(s) 57–70

    Author's details Ross Curnow and Henry Mayer
    Keywords Staatsregierung ; Australien
    Publisher Australian Institute of Political Science
    Publishing place Balmain, NSW
    Document type Article
    ZDB-ID 207500-3
    Database ECONomics Information System

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  3. Article: Hunting the P.M.: 33 traits in search of a man

    Mayer, Henry / Curnow, Ross

    Australian quarterly : AQ Vol. 40, No. 1 , p. 7-32

    1968  Volume 40, Issue 1, Page(s) 7–32

    Author's details Henry Mayer and Ross Curnow
    Keywords Australien ; Staatsregierung
    Publisher Australian Institute of Political Science
    Publishing place Balmain, NSW
    Document type Article
    ZDB-ID 207500-3
    Database ECONomics Information System

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  4. Article ; Online: Generation of time-independent torque by ultrasonic guided waves.

    Nedospasov, I A / Pupyrev, P D / Sotnikov, A / Schmidt, H / Weihnacht, M / Mayer, A P

    Ultrasonics

    2024  Volume 138, Page(s) 107250

    Abstract: The excitation of acoustic waves by a unidirectional transducer, integrated in a piezoelectric cylindrical tube or disk, can lead to a time-independent torque. This phenomenon, demonstrated earlier in experiments and analyzed with coupling-of mode theory, ...

    Abstract The excitation of acoustic waves by a unidirectional transducer, integrated in a piezoelectric cylindrical tube or disk, can lead to a time-independent torque. This phenomenon, demonstrated earlier in experiments and analyzed with coupling-of mode theory, is explained in detail, starting on the level of lattice dynamics of a piezoelectric crystal. Expressions are derived for the stationary torque in the form of integrals over the volume or surface of the piezoelectric, involving the electric potential and displacement field associated with the acoustic waves generated by the transducer. Simulations have been carried out with the help of the finite element method for a tube made of PZT for two cases: A pre-defined potential on the surface of the tube and metal electrodes buried in the piezoelectric. The displacement field and electric potential of the high-frequency acoustic waves (between 200 and 300 kHz) were computed and used in the evaluation of the integrals. The attenuation due to various loss channels of the acoustic waves in the system has been analyzed in detail, as this plays a crucial role for the efficiency of torque generation. It is conjectured that time-reversal symmetry, present in the absence of attenuation, prohibits the generation of a static torque at least in the linear limit. A qualitative comparison is made between the simulations and earlier experiments. Discrepancies are attributed to lack of knowledge of the relevant material constants of the piezoelectric and to a simplified modeling of the electrode geometry in the cylindrical tube, which was necessary for reasons of numerical accuracy.
    Language English
    Publishing date 2024-01-24
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 200839-7
    ISSN 1874-9968 ; 0041-624X
    ISSN (online) 1874-9968
    ISSN 0041-624X
    DOI 10.1016/j.ultras.2024.107250
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Zs.B 1133: Show issues Location:
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  5. Article ; Online: Plant-soil interactions alter nitrogen and phosphorus dynamics in an advancing subarctic treeline.

    Fetzer, Jasmin / Moiseev, Pavel / Frossard, Emmanuel / Kaiser, Klaus / Mayer, Mathias / Gavazov, Konstantin / Hagedorn, Frank

    Global change biology

    2024  Volume 30, Issue 3, Page(s) e17200

    Abstract: ... Here, we investigated nitrogen (N) and phosphorus (P) in plant and soil pools along two tundra-forest ... transects on Kola Peninsula, Russia, with a documented elevation shift of birch-dominated treeline by 70 m ... during the last 50 years. Results show that although total N and P stocks in the soil-plant system did ...

    Abstract Treelines advance due to climate warming. The impacts of this vegetation shift on plant-soil nutrient cycling are still uncertain, yet highly relevant as nutrient availability stimulates tree growth. Here, we investigated nitrogen (N) and phosphorus (P) in plant and soil pools along two tundra-forest transects on Kola Peninsula, Russia, with a documented elevation shift of birch-dominated treeline by 70 m during the last 50 years. Results show that although total N and P stocks in the soil-plant system did not change with elevation, their distribution was significantly altered. With the transition from high-elevation tundra to low-elevation forest, P stocks in stones decreased, possibly reflecting enhanced weathering. In contrast, N and P stocks in plant biomass approximately tripled and available P and N in the soil increased fivefold toward the forest. This was paralleled by decreasing carbon (C)-to-nutrient ratios in foliage and litter, smaller C:N:P ratios in microbial biomass, and lower enzymatic activities related to N and P acquisition in forest soils. An incubation experiment further demonstrated manifold higher N and P net mineralization rates in litter and soil in forest compared to tundra, likely due to smaller C:N:P ratios in decomposing organic matter. Overall, our results show that forest expansion increases the mobilization of available nutrients through enhanced weathering and positive plant-soil feedback, with nutrient-rich forest litter releasing greater amounts of N and P upon decomposition. While the low N and P availability in tundra may retard treeline advances, its improvement toward the forest likely promotes tree growth and forest development.
    MeSH term(s) Nitrogen ; Trees ; Forests ; Phosphorus ; Soil
    Chemical Substances Nitrogen (N762921K75) ; Phosphorus (27YLU75U4W) ; Soil
    Language English
    Publishing date 2024-03-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 1281439-8
    ISSN 1365-2486 ; 1354-1013
    ISSN (online) 1365-2486
    ISSN 1354-1013
    DOI 10.1111/gcb.17200
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    In stock of ZB MED Bonn / Germany

    Z 6338: Show issues

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  6. Article ; Online: Improved disinfection byproduct removal using a polysulfone membrane loaded with powdered activated carbon.

    Hou, Yizhi / Mayer, Brooke K

    Water environment research : a research publication of the Water Environment Federation

    2023  Volume 95, Issue 7, Page(s) e10908

    Abstract: ... L m ...

    Abstract Powdered activated carbon was immobilized by casting it in a polysulfone polymer membrane, which was then tested for disinfection byproduct (chloroform) and bacteria (Escherichia coli) removal. The membrane prepared using 90% T20 carbon and 10% polysulfone (M20-90) provided a filtration capacity of 2783 L m
    MeSH term(s) Charcoal ; Water Purification ; Chloroform ; Disinfection ; Powders ; Escherichia coli ; Filtration ; Polymers ; Adsorption ; Membranes, Artificial
    Chemical Substances Charcoal (16291-96-6) ; polysulfone P 1700 (25135-51-7) ; Chloroform (7V31YC746X) ; Powders ; Polymers ; Membranes, Artificial
    Language English
    Publishing date 2023-07-07
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1098976-6
    ISSN 1554-7531 ; 1047-7624 ; 1061-4303
    ISSN (online) 1554-7531
    ISSN 1047-7624 ; 1061-4303
    DOI 10.1002/wer.10908
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    In stock of ZB MED Cologne/Königswinter

    Zs.B 490: Show issues Location:
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  7. Article ; Online: Polarisation of Climate and Environmental Attitudes in the United States, 1973-2022

    E. Keith Smith / M. Julia Bognar / Adam P. Mayer

    npj Climate Action, Vol 3, Iss 1, Pp 1-

    2024  Volume 14

    Abstract: Abstract Since the early 1990s, increasing political polarisation is among the greatest determinants of individual-level environmental and climate change attitudes in the United States. But several patterns remain unclear: are historical patterns of ... ...

    Abstract Abstract Since the early 1990s, increasing political polarisation is among the greatest determinants of individual-level environmental and climate change attitudes in the United States. But several patterns remain unclear: are historical patterns of polarisation largely symmetrical (equal) or is rather asymmetrical (where one set of partisans shifts more than others)? How have polarisation patterns have changed over time? How generalizable are polarization patterns across different environmental and climate change attitudes? We harmonised four unique sets of historical, pooled cross-sectional survey data from the past 50 years to investigate shifts across seven distinct measures of citizen environmental and climate change attitudes. We find that contemporary attitudes are polarised symmetrically, with Democrats (higher) and Republicans (lower) attitudes are equidistant from the median. But the historical trends in polarisation differ by attitudes and beliefs. In particular, we find evidence of two distinct historical patterns of asymmetric polarisation within environmental and climate change attitudes: first, with Republicans becoming less pro-environmental, beginning in the early 1990s, and second, a more recent greening of Democratic environmental attitudes since the mid-2010s. Notably, recent increases in pro-environmental attitudes within Democrats is a potentially optimistic finding, providing opportunities towards overcoming decades-long inertia in climate action. These findings provide a foundation for further research avenues into the factors shaping increased pro-environmental attitudes within Democrats.
    Keywords Meteorology. Climatology ; QC851-999 ; Environmental sciences ; GE1-350
    Subject code 333 ; 320
    Language English
    Publishing date 2024-01-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Correction: Recent advances in the structural and mechanistic aspects of Hsp70 molecular chaperones.

    Mayer, Matthias P / Gierasch, Lila M

    The Journal of biological chemistry

    2020  Volume 295, Issue 1, Page(s) 288

    Language English
    Publishing date 2020-01-02
    Publishing country United States
    Document type Journal Article ; Published Erratum
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1074/jbc.AAC119.012167
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Uc I Zs.108: Show issues Location:
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  9. Article ; Online: The Effect of Body Composition on Cycling Power During an Incremental Test in Young Athletes.

    Schomöller, Anne / Schugardt, Monique / Kotsch, Peggy / Mayer, Frank

    Journal of strength and conditioning research

    2022  Volume 35, Issue 11, Page(s) 3225–3231

    Abstract: Abstract: Schomöller, A, Schugardt, M, Kotsch, P, and Mayer, F. The effect of body composition ... test results compared with those with low BF and FFM in all age and gender groups (p < 0.05 ...

    Abstract Abstract: Schomöller, A, Schugardt, M, Kotsch, P, and Mayer, F. The effect of body composition on cycling power during an incremental test in young athletes. J Strength Cond Res 35(11): 3225-3231, 2021-As body composition (BC) is a modifiable factor influencing sports performance, it is of interest for athletes and coaches to optimize BC to fulfill the specific physical demands of one sport discipline. The purpose of this study is to test the impact of body fat (BF) and fat-free mass (FFM) on aerobic performance in young athletes. Body composition parameters were evaluated among gender and age groups of young athletes undergoing their mandatory health examination. The maximal power (in Watts per kilogram body mass) of a stepwise incremental ergometer test was compared between 6 BC types: high BF, high FFM, high BF and high FFM, normal BC values, low BF, and low FFM. With increasing age (11-13 vs. 14-16 years) BF decreased and FFM increased in both genders. Both BC parameters, as well as body mass, correlated moderately with performance output (r = 0.36-0.6). Subjects with high BF or high FFM or both had significantly lower ergometer test results compared with those with low BF and FFM in all age and gender groups (p < 0.05). The finding that high levels of BF and FFM are detrimental for cycle power output is important to consider in disciplines that demand high levels of aerobic and anaerobic performance.
    MeSH term(s) Adipose Tissue ; Athletes ; Athletic Performance ; Bicycling ; Body Composition ; Female ; Humans ; Male
    Language English
    Publishing date 2022-03-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1156349-7
    ISSN 1533-4287 ; 1064-8011
    ISSN (online) 1533-4287
    ISSN 1064-8011
    DOI 10.1519/JSC.0000000000003271
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 6263: Show issues Location:
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  10. Article: Effect of Copper Segregation at Low-Angle Grain Boundaries on the Mechanisms of Plastic Relaxation in Nanocrystalline Aluminum: An Atomistic Study.

    Krasnikov, Vasiliy / Mayer, Alexander / Bezborodova, Polina / Gazizov, Marat

    Materials (Basel, Switzerland)

    2023  Volume 16, Issue 8

    Abstract: The paper studies the mechanisms of plastic relaxation and mechanical response depending on the concentration of Cu atoms at grain boundaries (GBs) in nanocrystalline aluminum with molecular dynamics simulations. A nonmonotonic dependence of the critical ...

    Abstract The paper studies the mechanisms of plastic relaxation and mechanical response depending on the concentration of Cu atoms at grain boundaries (GBs) in nanocrystalline aluminum with molecular dynamics simulations. A nonmonotonic dependence of the critical resolved shear stress on the Cu content at GBs is shown. This nonmonotonic dependence is related to the change in plastic relaxation mechanisms at GBs. At a low Cu content, GBs slip as dislocation walls, whereas an increase in Cu content involves a dislocation emission from GBs and grain rotation with GB sliding.
    Language English
    Publishing date 2023-04-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16083091
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