Log in

Relevant bibliographies by topics / YR 1704 / Journal articles

To see the other types of publications on this topic, follow the link: YR 1704.

Journal articles on the topic 'YR 1704'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'YR 1704.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Skopal, A., S. Yu Shugarov, U. Munari, et al. "The path to Z And-type outbursts: The case of V426 Sagittae (HBHA 1704-05)." Astronomy & Astrophysics 636 (April 2020): A77. http://dx.doi.org/10.1051/0004-6361/201937199.

Full text

Abstract:

Context. The star V426 Sge (HBHA 1704-05), originally classified as an emission-line object and a semi-regular variable, brightened at the beginning of August 2018, showing signatures of a symbiotic star outburst. Aims. We aim to confirm the nature of V426 Sge as a classical symbiotic star, determine the photometric ephemeris of the light minima, and suggest the path from its 1968 symbiotic nova outburst to the following 2018 Z And-type outburst. Methods. We re-constructed an historical light curve (LC) of V426 Sge from approximately the year 1900, and used original low- (R ∼ 500–1500; 330–880

APA, Harvard, Vancouver, ISO, and other styles

2

Sims, David T., Gladys L. Onambélé-Pearson, Adrian Burden, Carl Payton, and Christopher I. Morse. "Specific force of the vastus lateralis in adults with achondroplasia." Journal of Applied Physiology 124, no. 3 (2018): 696–703. http://dx.doi.org/10.1152/japplphysiol.00638.2017.

Full text

Abstract:

Achondroplasia is a clinical condition defined by shorter stature and disproportionate limb length. Force production in able-bodied individuals (controls) is proportional to muscle size, but given the disproportionate nature of achondroplasia, normalizing to anatomical cross-sectional area (ACSA) is inappropriate. The aim of this study was to assess specific force of the vastus lateralis (VL) in 10 adults with achondroplasia (22 ± 3 yr) and 18 sex-matched controls (22 ± 2 yr). Isometric torque (iMVCτ) of the dominant knee extensors (KE) and in vivo measures of VL muscle architecture, volume, a

APA, Harvard, Vancouver, ISO, and other styles

3

Nelson, Alan R., Harvey M. Kelsey, and Robert C. Witter. "Great earthquakes of variable magnitude at the Cascadia subduction zone." Quaternary Research 65, no. 3 (2006): 354–65. http://dx.doi.org/10.1016/j.yqres.2006.02.009.

Full text

Abstract:

AbstractComparison of histories of great earthquakes and accompanying tsunamis at eight coastal sites suggests plate-boundary ruptures of varying length, implying great earthquakes of variable magnitude at the Cascadia subduction zone. Inference of rupture length relies on degree of overlap on radiocarbon age ranges for earthquakes and tsunamis, and relative amounts of coseismic subsidence and heights of tsunamis. Written records of a tsunami in Japan provide the most conclusive evidence for rupture of much of the plate boundary during the earthquake of 26 January 1700. Cascadia stratigraphic

APA, Harvard, Vancouver, ISO, and other styles

4

Aloni, Michel, Alina Ferster, Phu-Quoc Le, et al. "Manual Chronic Partial Exchange In Children and Adolescents with Sickle Cell Disease: Impact on Clinical Outcome and Iron Overload." Blood 116, no. 21 (2010): 4821. http://dx.doi.org/10.1182/blood.v116.21.4821.4821.

Full text

Abstract:

Abstract Abstract 4821 Background: Red cell exchange transfusion is frequently used in the management of patients with sickle cell disease either electively or therapeutically to maintain an hemoglobin S (Hb S) level < 30–50%. This target is often difficult to maintain. In order to assess the effects of chronic partial exchange transfusion (CPET) a) on level of Hb and Hb S, b) on iron overload c) the need for chelation, d) on risk of long term adverse events and e) clinical outcome, we analyzed the data of sickle cell disease patients treated by long term CPET in our center. Methods/subject

APA, Harvard, Vancouver, ISO, and other styles

5

Liu, Kam-biu, Carl A. Reese, and Lonnie G. Thompson. "Ice-Core Pollen Record of Climatic Changes in the Central Andes during the last 400 yr." Quaternary Research 64, no. 2 (2005): 272–78. http://dx.doi.org/10.1016/j.yqres.2005.06.001.

Full text

Abstract:

AbstractThis paper presents a high-resolution ice-core pollen record from the Sajama Ice Cap, Bolivia, that spans the last 400 yr. The pollen record corroborates the oxygen isotopic and ice accumulation records from the Quelccaya Ice Cap and supports the scenario that the Little Ice Age (LIA) consisted of two distinct phases�"a wet period from AD 1500 to 1700, and a dry period from AD 1700 to 1880. During the dry period xerophytic shrubs expanded to replace puna grasses on the Altiplano, as suggested by a dramatic drop in the Poaceae/Asteraceae (P/A) pollen ratio. The environment around Sajama

APA, Harvard, Vancouver, ISO, and other styles

6

Gotthardt, U., U. Schweiger, J. Fahrenberg, C. J. Lauer, F. Holsboer, and I. Heuser. "Cortisol, ACTH, and cardiovascular response to a cognitive challenge paradigm in aging and depression." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 268, no. 4 (1995): R865—R873. http://dx.doi.org/10.1152/ajpregu.1995.268.4.r865.

Full text

Abstract:

Aging and hypercortisolism may be associated with alterations of stress-induced hormone release. We therefore studied 20 normal controls of two different age groups (< 30 and > 60 yr of age) and 20 age-matched patients with major depression; baseline ACTH and cortisol secretion (between 1400 and 1700) as well as blood pressure and heart rate and their responses to a 45-min lasting signal detection task (1705-1750) were determined. No difference in basal hypothalamic-pituitary-adrenal (HPA) system activity between young and older healthy controls was noted. The cognitive challenge resulte

APA, Harvard, Vancouver, ISO, and other styles

7

Bertrand, Sébastien, Xavier Boës, Julie Castiaux, et al. "Temporal evolution of sediment supply in Lago Puyehue (Southern Chile) during the last 600 yr and its climatic significance." Quaternary Research 64, no. 2 (2005): 163–75. http://dx.doi.org/10.1016/j.yqres.2005.06.005.

Full text

Abstract:

AbstractShort-term climate changes in Southern Chile are investigated by a multi-proxy analysis of a 53-cm-long sedimentary sequence selected among eight short cores retrieved in Lago Puyehue (Chile, 40°S). This core contains a 600-yr-long undisturbed record of paleo-precipitation changes. Two measurement methods for sediment density, organic matter and biogenic silica contents are compared and the most appropriate techniques are selected. Together with aluminium and titanium concentrations, grain size and geochemical properties of the organic matter, these proxies are used to demonstrate pale

APA, Harvard, Vancouver, ISO, and other styles

8

Mason, Owen K., and James W. Jordan. "Heightened North Pacific Storminess during Synchronous Late Holocene Erosion of Northwest Alaska Beach Ridges." Quaternary Research 40, no. 1 (1993): 55–69. http://dx.doi.org/10.1006/qres.1993.1056.

Full text

Abstract:

AbstractA progradational regime of falling sea level and/or high sediment input has produced extensive beach ridge plains in northwest Alaska during the last 4000 yr. Eleven Chukchi Sea beach ridge complexes, oriented at various angles to wind fetch, provide a cumulative history of longshore transport and erosion. Archaeological and geological upper limiting radiocarbon ages (n = 59) allow correlations between depositional units on seven beach ridge complexes. Progradation started 4000 yr B.P. at nearly all complexes, as eustatic sea level stabilized. Two disconformities or truncations are fou

APA, Harvard, Vancouver, ISO, and other styles

9

Mwamwenda, Tuntufye S. "Africans and Canadians: Cross-Cultural Personality Similarity in Extraversion." Psychological Reports 69, no. 3_suppl (1991): 1213–14. http://dx.doi.org/10.2466/pr0.1991.69.3f.1213.

Full text

Abstract:

Eysenck developed a theory and an inventory for classifying people along a continuum as extraverts to introverts. When examined cross-culturally, no difference in personality was noted between 98 black South Africans and 192 Canadians (mean age 22.4 yr. and 17.4 yr., respectively). Statistically significant sex differences were observed between women and men within both Canadian and South African samples.

APA, Harvard, Vancouver, ISO, and other styles

10

Padgett, Jason S., Simon E. Engelhart, Harvey M. Kelsey, Robert C. Witter, Niamh Cahill, and Eileen Hemphill-Haley. "Timing and amount of southern Cascadia earthquake subsidence over the past 1700 years at northern Humboldt Bay, California, USA." GSA Bulletin 133, no. 9-10 (2021): 2137–56. http://dx.doi.org/10.1130/b35701.1.

Full text

Abstract:

Abstract Stratigraphic, lithologic, foraminiferal, and radiocarbon analyses indicate that at least four abrupt mud-over-peat contacts are recorded across three sites (Jacoby Creek, McDaniel Creek, and Mad River Slough) in northern Humboldt Bay, California, USA (∼44.8°N, −124.2°W). The stratigraphy records subsidence during past megathrust earthquakes at the southern Cascadia subduction zone ∼40 km north of the Mendocino Triple Junction. Maximum and minimum radiocarbon ages on plant macrofossils from above and below laterally extensive (&gt;6 km) contacts suggest regional synchroneity of su

APA, Harvard, Vancouver, ISO, and other styles

11

Goodfriend, Glenn A. "Radiocarbon Age Anomalies in Shell Carbonate of Land Snails from Semi-Arid Areas." Radiocarbon 29, no. 2 (1987): 159–67. http://dx.doi.org/10.1017/s0033822200056915.

Full text

Abstract:

Radiocarbon age anomalies, resulting from ingestion of old carbonate, were measured in shell carbonate of live-collected snails from arid and semi-arid areas of Israel and the West Bank. The age anomalies were found to be similar to those in land snails from other climatic regions and averaged ca 1600 yr in Trochoidea seetzeni, 2200 yr in Sphincterochila spp, 800 yr in Levantina sp, and 1700 yr in coastal dune species. The differences are associated with ecological differences among taxa. The uncertainties of the age anomalies average several hundred years within each group. This renders radio

APA, Harvard, Vancouver, ISO, and other styles

12

Du, Shuhuan, Rong Xiang, Zuosheng Yang, Zhigang Guo, Yoshiki Saito, and Dejiang Fan. "Late-Holocene high-frequency East Asia Winter Monsoon variability inferred from the environmentally sensitive grain size component in the distal shelf mud area, East China Sea." Holocene 29, no. 1 (2018): 3–16. http://dx.doi.org/10.1177/0959683618814981.

Full text

Abstract:

The B2 (B2G) and I4 sediment cores recovered from the centre of the distal mud area of the East China Sea (ECS) were analysed for grain size distribution. Proxies for environmentally sensitive grain size components (ESGSC) retrieved from the composite B2 core, namely, variations in the volumetric content and mean grain size of specific grain size fractions, reveal a detailed history of the East Asia Winter Monsoon (EAWM) including centennial to decadal-scale variations spanning the last 2300 calendar years before present (cal. yr BP). The results indicate that EAWM variations are consistent wi

APA, Harvard, Vancouver, ISO, and other styles

13

Savoskul, Oxana S. "Holocene Glacier Advances in the Headwaters of Sredniaya Avacha, Kamchatka, Russia." Quaternary Research 52, no. 1 (1999): 14–26. http://dx.doi.org/10.1006/qres.1999.2051.

Full text

Abstract:

Holocene glacial deposits in Sredniya Avacha headwaters are subdivided into three age groups (events A, B, and C) based upon geomorphic features, tephrochronology, and lichenometry. Tephras of Opala volcano (1400–1500 yr B.P.), Ksudach volcano (1700–1800 and 6000 yr B.P.), and Zavaritskiy volcano (2800 yr B.P.) are used as stratigraphic markers. Rhizocarpon geographicum (L.) DC and Rhizocarpon section Alpicola growth curves are established using tephrochronologically dated and historical surfaces. The age of event A (pre-Hypsitermal?) moraines is constrained by an age of 6000 yr B.P. for overl

APA, Harvard, Vancouver, ISO, and other styles

14

Colgan, Patrick M., Jeffrey S. Munroe, and Zhou Shangzhe. "Cosmogenic radionuclide evidence for the limited extent of last glacial maximum glaciers in the Tanggula Shan of the Central Tibetan Plateau." Quaternary Research 65, no. 02 (2006): 336–39. http://dx.doi.org/10.1016/j.yqres.2005.08.026.

Full text

Abstract:

AbstractCosmogenic radionuclide (CRN) exposure ages provide evidence for the limited extent of last glacial maximum glaciers in the Tanggula Shan, central Tibetan Plateau. The most extensive advances occurred during or before marine oxygen isotope stage 6 (MIS-6) based on previous CRN exposure ages. The second most extensive advance occurred during or before MIS-4 based on previous ages and new ages of 41,400 ± 4300, and 66,800 ± 7100 10Be yr. A MIS-2 advance of less than 3 km occurred between 31,900 ± 3400 and 16,000 ± 1700 10Be yr.

APA, Harvard, Vancouver, ISO, and other styles

15

Mwamwenda, Tuntufye S. "A Comparison of Two Samples, South Africans and Canadians, on Social Desirability." Psychological Reports 72, no. 3 (1993): 965–66. http://dx.doi.org/10.2466/pr0.1993.72.3.965.

Full text

Abstract:

Reanalysis of previously collected scores from 86 African adults (22.4 yr. old) and 190 Canadian youth (17.4 yr.) on Eysenck's social desirability scale indicated differences across gender and cultures in describing one's own personality favourably. Whereas there was no gender difference for the Canadian adolescents, African women scored higher than the African men and the Canadian boys and girls. While the gender and cross-cultural differences are consistent with some prior work, they should be examined in greater detail with respect to cultural experiences and measures of personality, child-

APA, Harvard, Vancouver, ISO, and other styles

16

Li, Pingyuan, Mingkun Li, Huayang Gan, and Zhen Xia. "A preliminary study on sediment records of possible typhoon in the northern South China Sea during the past 6500 years." Holocene 31, no. 7 (2021): 1221–28. http://dx.doi.org/10.1177/09596836211003229.

Full text

Abstract:

Typhoon is an important meteorological phenomenon that affects the living and development of human beings on the southern China coast. However, there is still lack of clarity in the paleo-typhoon history and its influence on the evolution of the ancient human settlement environment since the mid-Holocene. Here, we identify six typhoon-like deposits from a core retrieved from the northern South China Sea shelf, close to the Pearl River Estuary, based on accelerated mass spectrometry 14C dating, grain size, and geochemistry. The sand fractions, CaO, Sr, SiO2/TiO2, and SiO2/Al2O3 were used to ind

APA, Harvard, Vancouver, ISO, and other styles

17

Byrne, Roger, B. Lynn Ingram, Scott Starratt, Frances Malamud-Roam, Joshua N. Collins, and Mark E. Conrad. "Carbon-Isotope, Diatom, and Pollen Evidence for Late Holocene Salinity Change in a Brackish Marsh in the San Francisco Estuary." Quaternary Research 55, no. 1 (2001): 66–76. http://dx.doi.org/10.1006/qres.2000.2199.

Full text

Abstract:

AbstractAnalysis of diatoms, pollen, and the carbon-isotopic composition of a sediment core from a brackish marsh in the northern part of the San Francisco Estuary has provided a paleosalinity record that covers the past 3000 yr. Changes in marsh composition and diatom frequencies are assumed to represent variations in freshwater inflow to the estuary. Three periods of relatively high salinity (low freshwater inflow) are indicated, 3000 to 2500 cal yr B.P., 1700 to 730 cal yr B.P., and ca. A.D. 1930 to the present. The most recent period of high salinity is primarily due to upstream storage an

APA, Harvard, Vancouver, ISO, and other styles

18

Mumbi, C. T., R. Marchant, H. Hooghiemstra, and M. J. Wooller. "Late Quaternary vegetation reconstruction from the Eastern Arc Mountains, Tanzania." Quaternary Research 69, no. 2 (2008): 326–41. http://dx.doi.org/10.1016/j.yqres.2007.10.012.

Full text

Abstract:

Pollen, spore, macrofossil and stable isotope (C and N) analyses from a 266-cm sediment core collected from a swamp on the Eastern Arc Mountains, Tanzania, are used to reconstruct vegetation and environmental history. An estimated time scale based on five14C ages records approximately 38,000 yr. This palaeorecord is the first from this biodiversity hotspot and importantly extends through the last glacial maximum (LGM). The altitudinal transition from montane to upper montane forest shifted from 1700–1800 m (38,00014C yr BP) to 1800–1900 m (35,000–29,00014C yr BP). From 29,000 to 10,00014C yr B

APA, Harvard, Vancouver, ISO, and other styles

19

Sherrod, Brian L., Robert C. Bucknam, and Estella B. Leopold. "Holocene Relative Sea Level Changes along the Seattle Fault at Restoration Point, Washington." Quaternary Research 54, no. 3 (2000): 384–93. http://dx.doi.org/10.1006/qres.2000.2180.

Full text

Abstract:

At a marsh on the hanging wall of the Seattle fault, fossil brackish water diatom and plant seed assemblages show that the marsh lay near sea level between ∼7500 and 1000 cal yr B.P. This marsh is uniquely situated for recording environmental changes associated with past earthquakes on the Seattle fault. Since 7500 cal yr B.P., changes in fossil diatoms and seeds record several rapid environmental changes. In the earliest of these, brackish conditions changed to freshwater ∼6900 cal yr B.P., possibly because of coseismic uplift or beach berm accretion. If coseismic uplift produced the fresheni

APA, Harvard, Vancouver, ISO, and other styles

20

Placzek, Christa, Jay Quade, and Julio L. Betancourt. "Holocene Lake-Level Fluctuations of Lake Aricota, Southern Peru." Quaternary Research 56, no. 2 (2001): 181–90. http://dx.doi.org/10.1006/qres.2001.2263.

Full text

Abstract:

AbstractLacustrine deposits exposed around Lake Aricota, Peru (17° 22′S), a 7.5-km2 lake dammed by debris flows, provide a middle to late Holocene record of lake-level fluctuations. Chronological context for shoreline deposits was obtained from radiocarbon dating of vascular plant remains and other datable material with minimal 14C reservoir effects (<350 yr). Diatomites associated with highstands several meters above the modern lake level indicate wet episodes. Maximum Holocene lake level was attained before 6100 14C yr B.P. and ended ∼2700 14C yr B.P. Moderately high lake levels occurred

APA, Harvard, Vancouver, ISO, and other styles

21

Yu, Shi-Yong, Chunhai Li, Xuexiang Chen, Guiyun Jin, and Hui Fang. "Rates of Organic Carbon Burial in a Floodplain Lake of the Lower Yellow River Area During the Late Holocene." Radiocarbon 56, no. 3 (2014): 1129–38. http://dx.doi.org/10.2458/56.17923.

Full text

Abstract:

The rapid outward and upward growth of the world's large fluvial sedimentary systems during the second half of the Holocene is a remarkable geologic process that may have buried considerable areas of pre-existing riparian wetlands, which in turn would sequester massive carbon. However, the role of floodplain lakes in the global carbon budget has long been neglected. This article demonstrates the potential of organic carbon burial due to floodplain aggradation during the late Holocene by analyzing a sediment core from a buried floodplain lake in the lower Yellow River area. Based on detailed ra

APA, Harvard, Vancouver, ISO, and other styles

22

Fitch, Erin P., and Grant A. Meyer. "Temporal and spatial climatic controls on Holocene fire-related erosion and sedimentation, Jemez Mountains, New Mexico." Quaternary Research 85, no. 1 (2016): 75–86. http://dx.doi.org/10.1016/j.yqres.2015.11.008.

Full text

Abstract:

In the Jemez Mountains, tree-ring data indicate that low-severity fires characterized the 400 yr before Euro-American settlement, and that subsequent fire suppression promoted denser forests, recent severe fires, and erosion. Over longer timescales, climate change may alter fire regimes; thus, we used fire-related alluvial deposits to assess the timing of moderate- to high-severity fires, their geomorphic impact, and relation to climate over the last 4000 yr. Fire-related sedimentation does not clearly follow millennial-scale climatic changes, but probability peaks commonly correspond with sev

APA, Harvard, Vancouver, ISO, and other styles

23

Vasskog, Kristian, Øyvind Paasche, Atle Nesje, John F. Boyle, and H. J. B. Birks. "A new approach for reconstructing glacier variability based on lake sediments recording input from more than one glacier." Quaternary Research 77, no. 1 (2012): 192–204. http://dx.doi.org/10.1016/j.yqres.2011.10.001.

Full text

Abstract:

We explore the possibility of building a continuous glacier reconstruction by analyzing the integrated sedimentary response of a large (440 km2) glacierized catchment in western Norway, as recorded in the downstream lake Nerfloen (N61°56’, E6°52’). A multi-proxy numerical analysis demonstrates that it is possible to distinguish a glacier component in the ~ 8000-yr-long record, based on distinct changes in grain size, geochemistry, and magnetic composition. Principal Component Analysis (PCA) reveals a strong common signal in the 15 investigated sedimentary parameters, with the first principal c

APA, Harvard, Vancouver, ISO, and other styles

24

Rosenmeier, Michael F., David A. Hodell, Mark Brenner, Jason H. Curtis, and Thomas P. Guilderson. "A 4000-Year Lacustrine Record of Environmental Change in the Southern Maya Lowlands, Petén, Guatemala." Quaternary Research 57, no. 2 (2002): 183–90. http://dx.doi.org/10.1006/qres.2001.2305.

Full text

Abstract:

AbstractA 4000-yr sediment core record from Lake Salpetén, Guatemala, provides evidence for Maya-induced forest clearance and consequent soil erosion between ∼1700 cal yr B.C. and 850 cal yr A.D. Radiocarbon ages of wood, seeds, and charcoal support an age-depth model with average errors of ±110 cal yr. Relatively low carbonate δ18O values between 1300 and 400 cal yr B.C. coincide with pollen evidence for forest loss, consistent with increased surface and groundwater flow to the lake. Minimum δ18O values between 400 cal yr B.C. and 150 cal yr A.D. suggest a high lake level, as do 14C-dated aqu

APA, Harvard, Vancouver, ISO, and other styles

25

Newby, Paige E., Peter Killoran, Mahlon R. Waldorf, Bryan N. Shuman, Robert S. Webb, and Thompson Webb. "14,000 Years of Sediment, Vegetation, and Water-Level Changes at the Makepeace Cedar Swamp, Southeastern Massachusetts." Quaternary Research 53, no. 3 (2000): 352–68. http://dx.doi.org/10.1006/qres.1999.2120.

Full text

Abstract:

AbstractData from a transect of four cores collected in the Makepeace Cedar Swamp, near Carver, Massachusetts, record past changes in deposition, vegetation, and water level. Time series of palynological data provide a 14,000-yr record of regional and local vegetation development, a means for biostratigraphic correlation and dating, and information about changes in water level. Differences in records among cores in the basin show that water level decreased at least 1.5 m between ∼10,800 and 9700 cal yr B.P., after which sediment accumulation was slow and intermittent across the basin for about

APA, Harvard, Vancouver, ISO, and other styles

26

Ferretti, D. F., J. B. Miller, J. W. C. White, K. R. Lassey, D. C. Lowe, and D. M. Etheridge. "Stable isotopes provide revised global limits of aerobic methane emissions from plants." Atmospheric Chemistry and Physics 7, no. 1 (2007): 237–41. http://dx.doi.org/10.5194/acp-7-237-2007.

Full text

Abstract:

Abstract. Recently Keppler et al. (2006) discovered a surprising new source of methane – terrestrial plants under aerobic conditions, with an estimated global production of 62–236 Tg yr−1 by an unknown mechanism. This is ~10–40% of the annual total of methane entering the modern atmosphere and ~30–100% of annual methane entering the pre-industrial (0 to 1700 AD) atmosphere. Here we test this reported global production of methane from plants against ice core records of atmospheric methane concentration (CH4) and stable carbon isotope ratios (δ13CH4) over the last 2000 years. Our top-down approa

APA, Harvard, Vancouver, ISO, and other styles

27

Abbott, Mark B., Michael W. Binford, Mark Brenner, and Kerry R. Kelts. "A 350014C yr High-Resolution Record of Water-Level Changes in Lake Titicaca, Bolivia/Peru." Quaternary Research 47, no. 2 (1997): 169–80. http://dx.doi.org/10.1006/qres.1997.1881.

Full text

Abstract:

Sediment cores collected from the southern basin of Lake Titicaca (Bolivia/Peru) on a transect from 4.6 m above overflow level to 15.1 m below overflow level are used to identify a new century-scale chronology of Holocene lake-level variations. The results indicate that lithologic and geochemical analyses on a transect of cores can be used to identify and date century-scale lake-level changes. Detailed sedimentary analyses of subfacies and radiocarbon dating were conducted on four representative cores. A chronology based on 60 accelerator mass spectrometer radiocarbon measurements constrains t

APA, Harvard, Vancouver, ISO, and other styles

28

Hatem, Alexandra E., James F. Dolan, Robert W. Zinke, et al. "Holocene to latest Pleistocene incremental slip rates from the east-central Hope fault (Conway segment) at Hossack Station, Marlborough fault system, South Island, New Zealand: Towards a dated path of earthquake slip along a plate boundary fault." Geosphere 16, no. 6 (2020): 1558–84. http://dx.doi.org/10.1130/ges02263.1.

Full text

Abstract:

Abstract Geomorphic field and aerial lidar mapping, coupled with fault-parallel trenching, reveals four progressive offsets of a stream channel and an older offset of the channel headwaters and associated fill terrace–bedrock contact at Hossack Station along the Conway segment of the Hope fault, the fastest-slipping fault within the Marlborough fault system in northern South Island, New Zealand. Radiocarbon and luminescence dating of aggradational surface deposition and channel initiation and abandonment event horizons yields not only an average dextral rate of ∼15 mm/yr since ca. 14 ka, but a

APA, Harvard, Vancouver, ISO, and other styles

29

Benda, L., T. J. Beechie, R. C. Wissmar, and A. Johnson. "Morphology and Evolution of Salmonid Habitats in a Recently Deglaciated River Basin, Washington State, USA." Canadian Journal of Fisheries and Aquatic Sciences 49, no. 6 (1992): 1246–56. http://dx.doi.org/10.1139/f92-140.

Full text

Abstract:

Morphology and distribution of salmonid habitats were related to the geomorphology of a river basin at three spatial scales including reach (102–103 m2), subbasin (2–26 km2), and the watershed (240 km2). Stream reaches on a young fluvial terrace (1700 yr old) adjacent to the main river contain the most extensive areas of rearing and spawning habitats. In tributary subbasins, the area of spawning habitat varies according to discharge rates and channel gradients. The most extensive salmonid habitats are located along wide glacial deposits in geologically unconstrained areas of the main valley fl

APA, Harvard, Vancouver, ISO, and other styles

30

Peros, Matthew C., Eduard G. Reinhardt, and Anthony M. Davis. "A 6000-year record of ecological and hydrological changes from Laguna de la Leche, north coastal Cuba." Quaternary Research 67, no. 1 (2007): 69–82. http://dx.doi.org/10.1016/j.yqres.2006.08.004.

Full text

Abstract:

AbstractLaguna de la Leche, north coastal Cuba, is a shallow (≤ 3 m), oligohaline (∼ 2.0–4.5‰) coastal lake surrounded by mangroves and cattail stands. A 227-cm core was studied using loss-on-ignition, pollen, calcareous microfossils, and plant macrofossils. From ∼6200 to ∼ 4800 cal yr BP, the area was an oligohaline lake. The period from ∼ 4800 to ∼ 4200 cal yr BP saw higher water levels and a freshened system; these changes are indicated by an increase in the regional pollen rain, as well as by the presence of charophyte oogonia and an increase in freshwater gastropods (Hydrobiidae). By ∼ 40

APA, Harvard, Vancouver, ISO, and other styles

31

Damon, Paul E., and Timothy W. Linick. "Geomagnetic-Heliomagnetic Modulation of Atmospheric Radiocarbon Production." Radiocarbon 28, no. 2A (1986): 266–78. http://dx.doi.org/10.1017/s0033822200007360.

Full text

Abstract:

New Arizona high precision Δ14C data back to 6500 BC plot close to an 11,300-yr period sinusoid extrapolated from the post 5300 BC data (offset = +32‰, half amplitude = 51‰ and phase lag = 2.29 radians). The trend curve is modulated by high latitude components of the non-dipole field with a fundamental period of 2400 yr. Based upon a model of Lund and Banerjee (1985), the non-dipole field rotates and every 1200 yr the high latitude maxima pass over the north magnetic pole and near the south magnetic pole in reversed polarity. This modulates cosmic ray production producing extended maxima ca AD

APA, Harvard, Vancouver, ISO, and other styles

32

Sawai, Yuki. "Episodic Emergence in the Past 3000 Years at the Akkeshi Estuary, Hokkaido, Northern Japan." Quaternary Research 56, no. 2 (2001): 231–41. http://dx.doi.org/10.1006/qres.2001.2258.

Full text

Abstract:

AbstractAt the Akkeshi estuary, rapid emergence interrupted Holocene submergence at least four times in the past 3000 years. Each emergence event produced an upward change from estuarine mud to freshwater peat. While the estuarine mud abounds in brackish and marine diatoms, freshwater taxa dominate the peat. Emergence events occurred from 1700 to 2300, 1000 to 1300, and 500 to 700 cal yr B.P. An additional emergence event predated by several decades a volcanic ash that erupted in A.D. 1694. At least three of the events produced contacts abrupt enough to represent uplift during earthquakes. Suc

APA, Harvard, Vancouver, ISO, and other styles

33

Wolff, Christian, Birgit Plessen, Alexey S. Dudashvilli, et al. "Precipitation evolution of Central Asia during the last 5000 years." Holocene 27, no. 1 (2016): 142–54. http://dx.doi.org/10.1177/0959683616652711.

Full text

Abstract:

Central Asia is located at the confluence of large-scale atmospheric circulation systems. However, the number of Holocene climate records is still low in most parts of this region and insufficient to allow detailed discussion and comparisons to disentangle the complex climate history and interplays between the different climatic systems. Here, we present the first stalagmite record from arid Central Asia (south-western Kyrgyzstan) by using δ18O, δ13C, and micro x-ray fluorescence (µXRF)-sulfur data spanning the last 5000 years. The cave hosting stalagmite Uluu-2 is ideally suited to identify p

APA, Harvard, Vancouver, ISO, and other styles

34

Battistel, Dario, Elena Argiriadis, Natalie Kehrwald, Maddalena Spigariol, James M. Russell, and Carlo Barbante. "Fire and human record at Lake Victoria, East Africa, during the Early Iron Age: Did humans or climate cause massive ecosystem changes?" Holocene 27, no. 7 (2016): 997–1007. http://dx.doi.org/10.1177/0959683616678466.

Full text

Abstract:

Organic molecular markers determined in a sediment core (V95-1A-1P) from Lake Victoria (East Africa) were used to reconstruct the history of human impact and regional fire activity during the Early Iron Age (~2400 to ~1100 yr BP). Fire history was reconstructed using levoglucosan and polycyclic aromatic hydrocarbons (PAHs) as markers for biomass burning that demonstrate two distinct fire periods peaking at 1450–1700 and 1850–2050 cal. yr BP. A partial correlation between levoglucosan and PAHs is interpreted as different transport behaviors and burn temperatures affecting the proxies. A fecal s

APA, Harvard, Vancouver, ISO, and other styles

35

Bigio, Erica R., Thomas W. Swetnam, and Philip A. Pearthree. "Late Holocene fire–climate relationships of the western San Juan Mountains, Colorado." International Journal of Wildland Fire 26, no. 11 (2017): 944. http://dx.doi.org/10.1071/wf16204.

Full text

Abstract:

In recent decades, warming temperatures and severe drought have contributed to large and severe wildfires in the south-western United States. To put current wildfires in a long-term context, we reconstructed fire events with alluvial stratigraphy methods in south-western Colorado, and compared with paleoclimate records over the late Holocene. The chronology of 32 fire-related sedimentation events from six tributary basins was established using 48 radiocarbon dates. Based on deposit characteristics, we found episodes of increased high-severity fire for 2750–2350 cal yr BP (800–400 BCE); 1400–11

APA, Harvard, Vancouver, ISO, and other styles

36

Hereford, Richard, Kathryn S. Thompson, and Kelly J. Burke. "Numerical Ages of Holocene Tributary Debris Fans Inferred from Dissolution Pitting on Carbonate Boulders in the Grand Canyon of Arizona." Quaternary Research 50, no. 2 (1998): 139–47. http://dx.doi.org/10.1006/qres.1998.1987.

Full text

Abstract:

Carbonate boulders transported down steep tributary channels by debris flow came to rest on Holocene debris fans beside the Colorado River in Grand Canyon National Park. Weakly acidic rainfall and the metabolic activity of blue-green algae have produced roughly hemispheric dissolution pits as much as 2-cm deep on the initially smooth surfaces of the boulders. The average depth of dissolution pits increases with relative age of fan surfaces. The deepening rate averages 2.4 mm/1000 yr (standard error = 0.2 mm/1000 yr), as calculated from several radiometrically dated surfaces and an archeologica

APA, Harvard, Vancouver, ISO, and other styles

37

Sava, Gabriela O., Ionel Popa, Tiberiu B. Sava, et al. "Intervalidation of Dendrochronology and 14C Dating on a 700-yr Tree-Ring Sequence Originating from the Eastern Carpathians." Radiocarbon 61, no. 5 (2019): 1337–43. http://dx.doi.org/10.1017/rdc.2019.56.

Full text

Abstract:

ABSTRACTWe present a comparative study on a 700-yr sequence of dendrochronologically ordered tree-rings of Pinus cembra originating from Eastern Carpathians for the period AD 1009–1709. This period covers the solar minima of the Little Ice Age. The aim of this study was to assess the accuracy of our radiocarbon (14C) determinations interpreted on the IntCal13 calibration data and to observe any apparent offsets. The 14C measurements on single and double tree-rings were “wiggle-matched” to secure the dendrochronology cross-matching of all the Pinus cembra wood pieces. The results showed a very

APA, Harvard, Vancouver, ISO, and other styles

38

Ferretti, D. F., J. B. Miller, J. W. C. White, K. R. Lassey, D. C. Lowe, and D. M. Etheridge. "Stable isotopes provide revised global limits of aerobic methane emissions from plants." Atmospheric Chemistry and Physics Discussions 6, no. 4 (2006): 5867–75. http://dx.doi.org/10.5194/acpd-6-5867-2006.

Full text

Abstract:

Abstract. Recently Keppler et al. (2006) discovered a surprising new source of methane – terrestrial plants under aerobic conditions, with an estimated global production of 62–236 Tg yr−1 by an unknown mechanism. This is ~10–50% of the annual total of methane entering the modern atmosphere and ~30–100% of annual methane entering the pre-industrial (0 to 1700 AD) atmosphere. Here we test this reported global production of methane from plants against ice core records of atmospheric methane concentration (CH4) and stable carbon isotope ratios (δ13CH4) over the last 2000 years. Our top-down approa

APA, Harvard, Vancouver, ISO, and other styles

39

Williams, Natalia, Maria Rieradevall, Diego Añón Suárez, et al. "Chironomids as indicators of natural and human impacts in a 700-yr record from the northern Patagonian Andes." Quaternary Research 86, no. 2 (2016): 120–32. http://dx.doi.org/10.1016/j.yqres.2016.07.002.

Full text

Abstract:

AbstractChironomid communities were studied in a sediment core collected from Lake Moreno Oeste, located in Nahuel Huapi National Park. A major change in midge assemblages occurred at ∼AD 1760, which was characterized by a decrease of “cold taxa” including Polypedilum sp.2 and Dicrotendipes, and an increase of “warm taxa” including Apsectrotanypus and Polypedilum sp.1. These taxa are likely related to climatic conditions concurrent with the end of a cold period at ∼AD 1500-1700 and the beginning of a drying climate at ∼AD 1740-1900 in northern Patagonia. Coarse tephra layers had low midge dive

APA, Harvard, Vancouver, ISO, and other styles

40

Gou, Xiaohua, Yang Deng, Fahu Chen, et al. "Precipitation variations and possible forcing factors on the Northeastern Tibetan Plateau during the last millennium." Quaternary Research 81, no. 3 (2014): 508–12. http://dx.doi.org/10.1016/j.yqres.2013.09.005.

Full text

Abstract:

AbstractUnderstanding precipitation variation, drought and flood history, and their associated forcing mechanisms are important to human society. In this study, five moisture-sensitive tree-ring width chronologies are used to represent variations in precipitation over the past millennium on the Northeastern Tibetan Plateau (NETP). We find a strong coherency between chronologies in the NETP, indicating a common response to regional climate during the last millennium. The first principal component of the five chronologies (PC1) correlates significantly with regional precipitation and can thus be

APA, Harvard, Vancouver, ISO, and other styles

41

Phartiyal, Binita, Randheer Singh, Priyanka Joshi, and Debarati Nag. "Late-Holocene climatic record from a glacial lake in Ladakh range, Trans-Himalaya, India." Holocene 30, no. 7 (2020): 1029–42. http://dx.doi.org/10.1177/0959683620908660.

Full text

Abstract:

A multi-proxy study using mineral magnetism, sediment texture, total organic content, palynofacies and diatoms was conducted in one of the highest proglacial lake situated at North Pulu (5098 m a.s.l.) of Ladakh sector of NW Himalaya – a high-altitude cold arid desert. This study presents climatic variations that occurred between 5412 and 419 cal. yr BP (14C AMS chronology). Directly recharged by meltwater from Khardung glacier, this proglacial lake provides a complete record of past climatic variability due to continuous sedimentation and this attribute makes it an exceptionally important geo

APA, Harvard, Vancouver, ISO, and other styles

42

Theissen, Kevin M., Thomas A. Hickson, Ashley L. Brundrett, Sarah E. Horns, and Matthew S. Lachniet. "A record of mid- and late Holocene paleohydroclimate from Lower Pahranagat Lake, southern Great Basin." Quaternary Research 92, no. 2 (2019): 352–64. http://dx.doi.org/10.1017/qua.2019.11.

Full text

Abstract:

AbstractWe present a continuous, sediment core-based record of paleohydroclimate spanning ~5800 cal yr BP to recent from Lower Pahranagat Lake (LPAH), a shallow, alkaline lake in southern Nevada. We apply stable isotopes (δ18O and δ13C) from fine-fraction authigenic carbonate, which are sensitive recorders of hydroclimatic variability in this highly evaporative region. Additional geochemical proxies (total organic carbon, C/N, and total inorganic carbon) provide supporting information on paleoecological change in and around the lake. Our data suggest progressively wetter conditions starting at

APA, Harvard, Vancouver, ISO, and other styles

43

Ali, Sheikh Nawaz, Shailesh Agrawal, Anupam Sharma, et al. "Holocene hydroclimatic variability in the Zanskar Valley, Northwestern Himalaya, India." Quaternary Research 97 (April 30, 2020): 140–56. http://dx.doi.org/10.1017/qua.2020.22.

Full text

Abstract:

AbstractA 1.3-m-long sediment core from the Penzi-la pass, Zanskar Valley, provides a record of hydroclimatic conditions and abrupt climate changes over short time scales since the mid-Holocene. These climatic changes of centennial time scale are crucial to understanding the hydroclimatic variability in northwestern (NW) Himalaya. Relatively higher δ13C values complemented by total organic carbon, loss on ignition, grain size parameters, and lower Rubidium/Strontium ratios during the Late Northgrippian imply that the area had a dry climate during the period from ~6200–4500 cal yr BP. Subsequen

APA, Harvard, Vancouver, ISO, and other styles

44

Grosicki, Greg J., Robert A. Standley, Kevin A. Murach, et al. "Improved single muscle fiber quality in the oldest-old." Journal of Applied Physiology 121, no. 4 (2016): 878–84. http://dx.doi.org/10.1152/japplphysiol.00479.2016.

Full text

Abstract:

We examined single muscle fiber contractile function of the oldest-old (3F/2M, 89 ± 1 yr old) enrolled in The Health, Aging, and Body Composition Study (The Health ABC Study). Vastus lateralis muscle biopsies were obtained and single muscle fiber function was determined ( n = 105) prior to myosin heavy chain (MHC) isoform identification with sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Cross-sectional area of MHC I muscle fibers (5,576 ± 333 μm2; n = 58) was 21% larger ( P < 0.05) than MHC IIa fibers (4,518 ± 386 μm2; n = 47). Normalized power (an indicator of muscle fiber qua

APA, Harvard, Vancouver, ISO, and other styles

45

Tadesse, Dereje, Ryszard Puchala, Terry A. Gipson, and Arthur L. Goetsch. "199 Effects of high heat load conditions on Dorper, Katahdin, and St. Croix sheep from different regions of the USA." Journal of Animal Science 97, Supplement_1 (2019): 76. http://dx.doi.org/10.1093/jas/skz053.172.

Full text

Abstract:

Abstract Forty-six Dorper, 46 Katahdin, and 43 St. Croix female sheep (initial BW of 58, 59, and 46 kg, respectively, SEM = 1.75; 3.3 ± 0.18 yr of age, 2.6 - 3.7) from 45 commercial farms in four regions of the USA (Midwest, Northwest, Southeast, and central Texas) were used to evaluate responses to high heat load index (HLI) conditions in a central facility. The four trials entailed sequential 2-wk periods with target HLI during day/nighttime of 70/70 (thermoneutral zone conditions during the day and night), 85/70, 90/77, and 95/81, with weekly measures at 0700 (before increased daytime HLI),

APA, Harvard, Vancouver, ISO, and other styles

46

Mwamwenda, Tuntufye S., Jean-Paul Dionne, and Bernadette B. Mwamwenda. "Theoretical and Empirical Link between Psychological Differentiation and Extraversion." Psychological Reports 56, no. 1 (1985): 147–54. http://dx.doi.org/10.2466/pr0.1985.56.1.147.

Full text

Abstract:

This study examined a relationship between psychological differentiation and extraversion and possible sex differences in performance. A significant curvilinear relationship was observed for boys only. Boys were more field independent and extraverted than girls. Subjects were 192 (109 girls and 83 boys), students in Grades 11 and 12 from private and public schools in Oshawa and Ottawa, Canada. Their mean age was 17.4 yr. Psychological differentiation was measured by the Group Embedded Figures Test and extraversion by the Eysenck Personality Inventory, Form B.

APA, Harvard, Vancouver, ISO, and other styles

47

Abt, Helmut A. "Post Main-Sequence Changes in Rotational Velocities." Symposium - International Astronomical Union 215 (2004): 154–55. http://dx.doi.org/10.1017/s0074180900195452.

Full text

Abstract:

From recent measurements of the rotational velocities of 1100 B stars and 1700 A stars, we determined the maximum periods of binaries with fully circularized orbits. Combined with published data, we derived the relation of period (days) = 0.001 age0.42 (yr). We were able to reproduce the rotational velocities of giants from v sin i of dwarfs only if rigid body rotation applies to both. However for evolutionary expansions greater than 5 the angular momentum is conserved in shells, which is reasonable physically.

APA, Harvard, Vancouver, ISO, and other styles

48

Chen, Yanping, Wenzhe Lyu, Tengfei Fu, Yan Li, and Liang Yi. "Centennial Impacts of the East Asian Summer Monsoon on Holocene Deltaic Evolution of the Huanghe River, China." Applied Sciences 11, no. 6 (2021): 2799. http://dx.doi.org/10.3390/app11062799.

Full text

Abstract:

The Huanghe River (Yellow River) is the most sediment laden river system in the world, and many efforts have been conducted to understand modern deltaic evolution in response to anthropological impacts. However, the natural background and its linkage to climatic changes are less documented in previous studies. In this work, we studied the sediments of core YDZ–3 and marine surface samples by grain-size analysis to retrieve Holocene dynamics of the Huanghe River delta in detail. The main findings are as follows: The mean value of sediment grain size of the studied core is 5.5 ± 0.9 Φ, and silt

APA, Harvard, Vancouver, ISO, and other styles

49

Thomas, Elizabeth K., Jason P. Briner, Yarrow Axford, Donna R. Francis, Gifford H. Miller, and Ian R. Walker. "A 2000-yr-long multi-proxy lacustrine record from eastern Baffin Island, Arctic Canada reveals first millennium AD cold period." Quaternary Research 75, no. 3 (2011): 491–500. http://dx.doi.org/10.1016/j.yqres.2011.03.003.

Full text

Abstract:

AbstractWe generate a multi-proxy sub-centennial-scale reconstruction of environmental change during the past two millennia from Itilliq Lake, Baffin Island, Arctic Canada. Our reconstruction arises from a finely subsectioned 210Pb- and 14C-dated surface sediment core and includes measures of organic matter (e.g., chlorophyll a; carbon–nitrogen ratio) and insect (Diptera: Chironomidae) assemblages. Within the past millennium, the least productive, and by inference coldest, conditions occurred ca. AD 1700–1850, late in the Little Ice Age. The 2000-yr sediment record also reveals an episode of r

APA, Harvard, Vancouver, ISO, and other styles

50

Opała-Owczarek, Magdalena, and Tadeusz Niedźwiedź. "Last 1100 yr of precipitation variability in western central Asia as revealed by tree-ring data from the Pamir-Alay." Quaternary Research 91, no. 1 (2018): 81–95. http://dx.doi.org/10.1017/qua.2018.21.

Full text

Abstract:

AbstractWe developed a 1108 yr chronology of tree-ring widths, based on 64 Himalayan pencil juniper (Juniperus semiglobosa Regel) trees, for the Pamir-Alay Mountains, central Asia. Dendroclimatological analysis demonstrates that precipitation has significant effects on tree growth in the semiarid mountainous area of northwestern Tajikistan located on the edge of the great midlatitude Karakum and Kyzylkum deserts. The highest level of linear correlation (r=0.67) is observed between tree growth and seasonalised winter (previous December–February) precipitation. Our studies also show that moistur

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!