521 Works

Rainfall intensity limitation and sediment supply independence of post-wildfire debris flows in the western U.S.

Paul M. Santi & Blaire MacAulay
This work explores two hypotheses related to post-wildfire debris flows: first, that they are rainstorm-intensity limited and not rainstorm-volume limited, and second, that they are not sediment-supply limited. The first hypothesis suggests that it is common to generate more than enough water to account for the volume in the debris flow, but to actually produce a debris flow the water must be delivered in sufficiently large doses. This is demonstrated by a dataset of 44...

Flume investigation of the interaction mechanisms between debris flow and slit dams

H. S. Hu, Gordon G.D. Zhou & Dongri Song
Slit dams are designed to mitigate debris-flow hazards. However, according to field surveys and past experimental studies, slit dams constructed using currently prescribed design methods usually become blocked, which then leads to the loss of capacities of the slit dam’s capability to mitigate debris-flow hazards. In this study, a series of flume tests were conducted to investigate the interaction mechanisms between debris flows and slit dams. This work aims to contribute to the design of...

Monitoring and early warning of debris-flow in an earthquake impacted area, Baishahe catchment, southwest China

Hongling Tian, Zongji Yang, Jianping Qiao & Lili Shi
After 10 years of the Wenchuan earthquake of China, the post-seismic landslides are turning weak. However, the debris flows in earthquake-stricken area continue to be threat. In order to reduce the risk from debris flows in this region, we discuss the operation of an alert system, monitoring objectives, and early-warning policies. Three gullies in the Baishahe catchment, Dujiangyan, Southwest China were selected and rain-gauge, tilt-sensor, mud-meter and ground acoustic meter combined to a warning system...

Method for predicting debris-flow occurrence based on a rainfall and sediment runoff model, A

Masaharu Fujita, Kazuki Yamanoi & Gohta Suzuki
Based on a basin scale rainfall runoff model, we proposed a prediction method of debris-flow occurrence on steep mountain slopes related to hydrological processes such as the rainfall infiltration, the surface flow and the slope stability. For example, in one case that the soil layer is unsaturated and a landslide does not occur in the slope even though the groundwater level rises in the slope soil layer during a rainfall event, it is unlikely for...

Predictive bio-computational wear modeling for joint replacements

Jeffrey R. Armstrong & Anthony J. Petrella
Polyethylene wear has long been a topic of concern for the longevity of joint replacement systems as bearing failure is the leading cause for the need of revision surgery. Experimental simulations are costly and time consuming; therefore, a more efficient solution for predicting wear is computer simulation. Predictive computational modeling of the adhesive/abrasive wear mechanism has been in use for over a decade, but the accuracy of such models is still under debate [1-7]. Recent...

Biogenicity and biosignature potential of carbonate/silica structures in Little Hot Creek, The

Emily A. Kraus, R. Agustin Mors, Scott R. Beeler, James G. Floyd, Blake W. Stamps, Heather S. Nunn, Bradley S. Stevenson, Russel S. Shapiro, Hope Johnson, Frank A. Corsetti & John R. Spear

Atomic norm minimization for modal analysis with random spatial compression

Shuang Li, Dehui Yang & Michael B. Wakin

Complexity of a debris-flow system at Forest Falls, California

Kerry Cato & Brett Goforth
Historical patterns of debris flows have been reconstructed at the town of Forest Falls in the San Bernardino Mountains using a variety of field methods (mapping flow events after occurrence, dendrochronology evidence, soil chrono sequences). Large flow events occur when summer thunderstorms produce brief high-intensity rainfall to mobilize debris, however the geomorphic system exhibits properties of non-linear response rather than being a single-event precipitation-driven process. Previous studies contrasted the relative water content of flows generated...

Relationship between rainfall intensity and debris-flow initiation in a southern Colorado burned area

Evan Q. Friedman & Paul M. Santi
Wildfire impacts on vegetation, soils, and resulting hydrologic processes often result in debris-flow activity in mountainous areas, particularly in response to intense rainfall events that follow. Rainfall thresholds for debris-flow initiation in burned areas have been studied in a variety of settings. It has been proposed that short duration, high-intensity rainfall events are responsible for debris-flow initiation in burned areas. The timing of these responses relative to rainfall intensity peaks is not well understood, leaving...

Correlation between the slump parameters and rheological parameters of debris-flow

Chyan-Deng Jan, Chih-Yuan Yang, Ciao-Kai Hsu & Litan Dey
Rheological characteristics are important information for understanding or simulating debris-flow movement. Debris-flow movements involves complex and heterogeneous material with grain size distributions ranging from silt to large rocks. Conventional rheometers are usually limited to measure the rheological parameters of debris-flow of fine particles. Slump-tests has been used to evaluate the flow behaviour of fresh concretes which allow the tested concrete slurries to have larger particles. In this study, the relationship between the parameters obtained from...

Atomic norm minimization for modal analysis with random spatial compression

Shuang Li, Dehui Yang & Michael B. Wakin

Numerical simulation evaluation of compressed gas storage in depleted horizontal wells of low-permeability reservoirs

Muhammad Syamil Bin Muhammad Adib & Luis E. Zerpa
Includes bibliographical references.

Borehole thermal energy storage: a long term energy storage solution

Michael L. Lanahan & Paulo Cesar Tabares-Velasco
Includes bibliographical references.

Innovative computational approach for modeling thermo-hydro processes within enhanced geothermal, An

Kamran Jahan Bakhsh & Masami Nakagawa

Catalyst-free 'click chemistry' of zinc oxide surfaces

Charlotte Evans, Thomas Brenner, Gang Chen, Reuben T. Collins & Thomas E. Furtak
Click chemistry' describes reactions that can modify the surface functionality of a material simply and quickly by joining small molecules together. In this research, a five step process was developed involving the surface modification of zinc oxide surfaces with propiolic acid and 'clicking' with azidobenzene or 1-azido-4-fluorobenzene without the use of a catalyst. This process successfully modified the surface as determined by water contact angle, AFM imaging, absorption spectra, and PM IRRAS measurements.

Development of neutron radiography capabilities using a radioisotope neutron source

Shawn Robinson & Jeffrey C. King
The purpose is to develop neutron radiography capabilities using an existing radioisotope neutron source. This project involved the use of foil activation, collimator and sample holder design, film development, as well as the addition of radiation shielding. Design and modeling was done at the Colorado School of Mines, and the experiments we conducted at the Denver Federal Center at the USGS Triga Reactor, building 15.

Developing a process for studying annealing effects on mobilities in silicon quantum dots

Eleanor Adachi, Idemudia John Airuoyo, Lakshmi Krishna & Reuben T. Collins

Depolymerization of microbial-derived polyhydroxybutyrate (PHB) in an aqueous environment

Morgan Sulzbach, Shijie Leow & Timothy J. Strathmann

2014 Faculty Conference: investment in the campus for excellence

Kirsten M. Volpi
This presentation outlines the underlying goals of the four main areas of investment in excellence for the campus: 1) enhance the distinctive identity and reputation of Mines, 2) build upon a student‐centered culture of excellence, inclusion, diversity and community, 3) build and diversify revenue streams and auxiliary enterprises, and 4) develop and support infrastructure and processes to match Mines' aspiration to become a top-tier engineering and science institution.

2014 Faculty Conference: Office of Research and Technology Transfer update

Bruce Donald Honeyman
This presentation illustrates ways in which the Office of Research and Technology Transfer supports the various goals of the Mines strategic plan. It includes charts of research award dollar amounts since 2002 and the amount of awards by sponsor in fiscal year 2014. The update highlights current research outreach and major initiatives, technology transfer activities, and the establishment of research data services on campus.

2005 land cover maps with 30m and 50m spatial resolution

Nicolás Rodríguez-Jeangros, Amanda S. Hering, Timothy Kaiser & John E. McCray
SCaMF-RM fuses the information of six land intermediate to high resolution land cover products in the Rocky Mountains (RM) at two high spatial resolutions, 30 and 50 meters, and a yearly frequency for the period 1983 – 2012. The development of the fused products is based on the Spatiotemporal Categorical Map Fusion (SCaMF) methodology

1999 land cover maps with 30m and 50m spatial resolution

Nicolás Rodríguez-Jeangros, Amanda S. Hering, Timothy Kaiser & John E. McCray
SCaMF-RM fuses the information of six land intermediate to high resolution land cover products in the Rocky Mountains (RM) at two high spatial resolutions, 30 and 50 meters, and a yearly frequency for the period 1983 – 2012. The development of the fused products is based on the Spatiotemporal Categorical Map Fusion (SCaMF) methodology

CART 2 (2-bladed Controls Advanced Research Turbine) Variable Speed Data

Kathryn E. Johnson & Lee Jay Fingersh
Data is saved in a .dat format with supporting files in .c, .h, and .hdr formats. The supporting files can be read with any text editor. The .dat files are most easily read using the accompanying Matlab (.m) files.

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