Article
Geosciences, Multidisciplinary
R. M. Strickland, M. D. Covington, J. D. Gulley, R. B. Kayastha, J. M. Blackstock
Summary: The development of hummocky topography on debris-covered glaciers, often attributed to varying debris thickness, is not well understood. We examined the size distribution and geometry of depressions on the Ngozumpa Glacier in Nepal and found that they exhibited power-law size distribution, fractal perimeters, and power-law depth-area scaling, suggesting positive feedback growth. Based on these findings, we propose a sinkhole hypothesis, where englacial drainage removes debris from depressions and enables positive feedback growth through incision, increased sub-debris melt rates, and ice cliff retreat, preconditions for the rapid growth of glacial lakes.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Thermodynamics
Agata Mlonka-Medrala, Tadeusz Dziok, Aneta Magdziarz, Wojciech Nowak
Summary: In this study, the potential of Refuse Derived Fuel (RDF) in Poland was investigated, revealing significant limitations due to its high heterogeneity and contamination. Samples of fuel and fly ashes were analyzed to determine their composition and characteristics, while the impact of flue gas treatment on ash morphology and composition was also studied.
Article
Geosciences, Multidisciplinary
Xiaoyi Shen, Chang-Qing Ke, Yubin Fan, Lhakpa Drolma
Summary: In this study, a new Antarctic digital elevation model (DEM) is generated using the ICESat-2 satellite data. The DEM has high spatial resolution and accuracy and performs well in different surface types. It can be used in various research fields in Antarctica.
EARTH SYSTEM SCIENCE DATA
(2022)
Article
Geosciences, Multidisciplinary
Chuanyong Wu, Peizhen Zhang, Zhuqi Zhang, Wenjun Zheng, Binbin Xu, Weitao Wang, Zhongyuan Yu, Xunye Dai, Boxuan Zhang, Kezhi Zang
Summary: A previously overlooked strike-slip component of crustal deformation in the reactivated Tianshan orogenic belt has been documented. This non-negligible strike-slip component provides insights into the ongoing India-Eurasia collision in the Tianshan region. The study reveals the existence of left-lateral faulting and high strain zones in the Tianshan interior, which suggest high seismic geohazard zones in addition to the foreland thrust systems.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Eric Rignot, Jeremie Mouginot, Bernd Scheuchl, Seongsu Jeong
Summary: Ice motion and boundaries in Antarctica from 1995 to 2022 were studied, and the results showed no change in East Antarctica, widespread glacier speedup in West Antarctica and the Antarctic Peninsula, and iceberg detachments at ice shelf fronts. These changes are attributed to increased melting caused by warmer ocean waters.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Mengzhen Qi, Yan Liu, Jiping Liu, Xiao Cheng, Yijing Lin, Qiyang Feng, Qiang Shen, Zhitong Yu
Summary: Iceberg calving is a significant process contributing to the mass loss of ice sheets, with approximately half of the mass loss of the Antarctic ice sheet attributed to this mechanism. Observations of iceberg calving variability provide insights into calving mechanisms and the effects of changing climate on global sea level through the ice shelf buttressing effect. The dataset developed in this study records 1975 annual calving events larger than 1 km(2) on Antarctic ice shelves from 2005 to 2020, offering detailed information on each event for studying spatial-temporal variations in Antarctic iceberg calving.
EARTH SYSTEM SCIENCE DATA
(2021)
Article
Environmental Sciences
Sihan Yu, Xiaoning Su
Summary: This paper analyzes the GPS observation data of the northeastern margin of the Tibetan Plateau and obtains the present-day crustal velocity field in the region. By using inversion models, the slip rate distribution, locking depth, and slip deficit rate of each fault are determined. The results show that the Haiyuan Fault and Laohushan Fault are predominantly left-lateral strike-slip faults, while the Liupanshan Fault is a thrust dip-slip fault. The Guguan-Baoji Fault has both left-lateral strike-slip and thrust dip-slip components. The study also suggests a high mid-term to long-term seismic risk in the Liupanshan Fault based on geological and historical seismic data.
Article
Energy & Fuels
Izabella Maj, Sylwester Kalisz, Robert Wejkowski, Marek Pronobis, Klaudiusz Golombek
Summary: This study investigated corrosion products collected from waterwalls of a circulating fluidized bed boiler. Two types of corrosion spots were identified with high chlorine, potassium, and sodium contents. Laboratory corrosion tests determined the corrosion characteristics and the influence of fuel additives. Halloysite was found to be the most effective additive, and the porosity and adhesion of the oxide layer played a key role in the corrosion process.
Article
Engineering, Biomedical
Lingfei Ren, Zhiwei Jiang, Hui Zhang, Yani Chen, Danji Zhu, Jin He, Yunxuan Chen, Ying Wang, Guoli Yang
Summary: The hard palate mucosa (HPM) serves as an autologous donor area with superior biosafety and trauma healing ability, making it widely used and researched. Specific mesenchymal stem cells have been isolated from HPM, which have played an essential role in various clinical applications.
MATERIALS TODAY BIO
(2023)
Article
Materials Science, Multidisciplinary
Xinwen Zhang, Ruoyun Wang, Fei Long, Tong Zhou, Wenbin Hu, Lei Liu
Summary: The study fabricated a durable superhydrophobic coating on aluminum alloy using hard-soft technology, leading to excellent hydrophobicity and durability. Even after extensive polishing, the hydrophobic property of the coating can be restored after heat treatment, significantly improving its corrosion resistance.
Article
Computer Science, Interdisciplinary Applications
Jerome Monnier, Jiamin Zhu
Summary: This method combines surface measurements and thickness measurements to infer bed topography beneath glaciers using a non-isothermal Reduced Uncertainty version of the Shallow Ice Approximation equation. Through the use of neural networks and data assimilation processes, the method demonstrates robustness and applicability in estimating bed elevation under glaciers.
COMPUTATIONAL GEOSCIENCES
(2021)
Article
Geography, Physical
Jacob B. Woodard, Lucas K. Zoet, Neal R. Iverson, Christian Helanow
Summary: This study presents a method for estimating the average bed slope in contact with ice using variables and measured bed topography. The computed values of the average bed slope can provide the form of the slip law that relates drag to velocity and water pressure, avoiding computationally expensive numerical modeling. Experimental results show that basal drag generally increases with slip velocity up to a limiting value.
JOURNAL OF GLACIOLOGY
(2023)
Article
Engineering, Mechanical
Raphael Bilz, Kristin M. de Payrebrune
Summary: The presence of an intermediate layer of hard particles can strongly influence tribological systems, affecting the coefficient of friction, wear, and surface morphology. A mechanical substitute model was introduced to describe how hard particles of almost arbitrary geometry impact the dynamics of the system. A system characterizing quantity, the velocity limit, was defined to determine permanent or temporary contact between the bodies based on their tangential relative velocity. Experimental results confirmed the validity of the analytically derived velocity limit, demonstrating the model's effectiveness in describing this velocity-dependent phenomenon.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Manufacturing
Jakob Renner, Christoph Breuning, Matthias Markl, Carolin Koerner
Summary: Electron optical imaging is a monitoring method in electron beam powder bed fusion that allows in situ detection of porosity in each layer of a part. This study introduces the ability to quantitatively and in situ measure surface topographies using electron optical imaging. By recording electron optical images and employing a computation chain based on a developed imaging process model, it becomes possible to correct image distortions and calculate the gradient information of the surfaces. This enables the reconstruction of height maps of melt surfaces and the comparison with laser scanning microscope measurements validates the computation chain. Electron optical imaging can measure porosity and bulging simultaneously, providing important process information for process control and the implementation of feedback control loops.
ADDITIVE MANUFACTURING
(2022)
Article
Astronomy & Astrophysics
D. Rouxel, O. Sarzeaud, M. F. Lequentrec-Lalancette
Summary: This paper proposes a method to estimate the accuracy of any free air gravity anomaly model derived from satellite altimetry using validated marine data sets. The method has been successfully applied to produce continuous accuracy grids for SIO gravity anomaly models.
EARTH AND SPACE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Lucas K. Zoet, Neal R. Iverson
Article
Geography, Physical
Jacob B. Woodard, Lucas K. Zoet, Ivar O. Benediktsson, Neal R. Iverson, Andrew Finlayson
JOURNAL OF GLACIOLOGY
(2020)
Article
Geography, Physical
C. J. Roland, L. K. Zoet, J. E. Rawling, M. Cardiff
Summary: The study indicates that freeze-thaw environmental factors have a significant impact on the erosion of coastal bluffs at seasonal timescales, leading to increased pore pressures and frequent mass wasting events. Seasonal upslope erosion is primarily influenced by rising water levels and freeze-thaw processes, necessitating the inclusion of these transient conditions in landscape change models.
Article
Geography, Physical
Lucas K. Zoet, J. Elmo Rawling, Jacob B. Woodard, Nolan Barrette, David M. Mickelson
Summary: The study explores the relationship between drumlin shape and glacier slip speed, suggesting that drumlin shape could be used to infer paleo-glacier slip speeds. The findings highlight the influence of geological factors on drumlin morphology.
EARTH SURFACE PROCESSES AND LANDFORMS
(2021)
Article
Geosciences, Multidisciplinary
J. B. Woodard, L. K. Zoet, N. R. Iverson, C. Helanow
Summary: The morphology of glacier beds plays a critical role in determining slip speeds and rates of subglacial erosion. By studying the spatial parameters of bed morphologies in proglacial areas, researchers have found evidence of both convergence towards a common bed morphology due to glacier flow over bedrock, as well as distinct properties at different locations preventing uniformity.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Geosciences, Multidisciplinary
Conner J. C. Adams, Neal R. Iverson, Christian Helanow, Lucas K. Zoet, Charlotte E. Bate
Summary: Ice at depth in ice-stream shear margins is believed to be commonly temperate with interstitial meltwater that softens the ice. Experimental studies show that water softening amplifies basal slip and significantly affects the effective viscosity of ice.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Geography, Physical
Lucas K. Zoet, Neal R. Iverson, Lauren Andrews, Christian Helanow
Summary: Transient effects can influence glacier slip dynamics when subglacial conditions vary rapidly, and traditional steady-state sliding laws may not fully describe these phenomena.
JOURNAL OF GLACIOLOGY
(2022)
Article
Geosciences, Multidisciplinary
R. B. Alley, N. Holschuh, D. R. MacAyeal, B. R. Parizek, L. Zoet, K. Riverman, A. Muto, K. Christianson, E. Clyne, S. Anandakrishnan, N. Stevens
Summary: Bedforms of Thwaites Glacier in West Antarctica are shaped by the interactions among ice, bedrock, and subglacial water and sediment, with features such as large moats upglacier and soft sediment tails downglacier developing over time. This knowledge helps guide further studies to improve estimates of future sea-level rise and understand the formation of glacially sculpted landscapes by former ice sheets.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Geography, Physical
Jacob B. Woodard, Lucas K. Zoet, Neal R. Iverson, Christian Helanow
Summary: This study presents a method for estimating the average bed slope in contact with ice using variables and measured bed topography. The computed values of the average bed slope can provide the form of the slip law that relates drag to velocity and water pressure, avoiding computationally expensive numerical modeling. Experimental results show that basal drag generally increases with slip velocity up to a limiting value.
JOURNAL OF GLACIOLOGY
(2023)