A5090342124- Geology and Paleoclimatology Research
- Tree-ring climate responses
- Climate variability and models
- Medical Imaging Techniques and Applications
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Meteorological Phenomena and Simulations
- Plant Water Relations and Carbon Dynamics
- Algorithms and Data Compression
- CO2 Sequestration and Geologic Interactions
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Radiomics and Machine Learning in Medical Imaging
- Geological and Geophysical Studies
- Semiconductor materials and devices
- Climate change and permafrost
- Advancements in Semiconductor Devices and Circuit Design
- Oceanographic and Atmospheric Processes
- Tropical and Extratropical Cyclones Research
- Geological and Geochemical Analysis
- Software Engineering Research
- Ferroelectric and Negative Capacitance Devices
- Time Series Analysis and Forecasting
- Copper Interconnects and Reliability
- Color Science and Applications
NSF National Center for Atmospheric Research
2023-2024
NSF NCAR Climate and Global Dynamics Laboratory
2023-2024
Changjiang Institute of Survey, Planning, Design and Research
2024
Inner Mongolia Autonomous Region Meteorological Bureau
2024
University of Alabama in Huntsville
2022
University of Southern California
2017-2022
Southern California Earthquake Center
2020-2022
Nanjing University of Information Science and Technology
2021-2022
The University of Texas at Austin
2005-2021
Southern California University for Professional Studies
2017-2020
Climate variability in the tropical Pacific affects global climate on a wide range of time scales. On interannual scales, is home to El Niño–Southern Oscillation (ENSO). Decadal variations and changes Pacific, referred here collectively as decadal (TPDV), also profoundly affect system. Here, we use TPDV refer any form or change that occurs atmosphere, ocean, over land within Pacific. “Decadal,” which broad sense encompass multiyear through multidecadal includes about mean state externally...
Abstract We present a Python package geared toward the intuitive analysis and visualization of paleoclimate timeseries, Pyleoclim . The code is open‐source, object‐oriented, built upon standard scientific stack, allowing users to take advantage large collection existing emerging techniques. describe code's philosophy, structure, base functionalities apply it three problems: (a) orbital‐scale climate variability in deep‐sea core, illustrating spectral, wavelet, coherency presence age...
Abstract Explosive volcanism imposes impulse‐like radiative forcing on the climate system, providing a natural experiment to study response perturbation. Previous studies have identified disagreements between paleoclimate reconstructions and model simulations with respect magnitude recovery from volcanic cooling, questioning fidelity of simulations, reconstructions, or both. Using paleoenvironmental data assimilation framework Last Millennium Reanalysis, this investigates causes...
Abstract The potential for explosive volcanism to affect the El Niño-Southern Oscillation (ENSO) has been debated since 1980s. Several observational studies, based largely on tree-ring proxies, have found support a positive ENSO phase in year following large eruptions. In contrast, recent coral data from heart of tropical Pacific suggest no uniform response over last millennium. Here we leverage paleoclimate assimilation integrate both and proxies into reconstruction state, re-appraise this...
Significance Climate models are foundational to formulations of climate policy and must successfully reproduce key features the system. The temporal spectrum observed global surface temperature is one such critical benchmark. This known obey scaling laws connecting astronomical forcings, from orbital annual scales. We provide evidence that current hierarchy capable reproducing increase in variance global-mean at low frequencies. suggest successful predictions decadal-to-centennial horizons...
The Mid-Pliocene Warm Period (mPWP) provides a valuable analog for near-future climate warming with an estimated global mean temperature  2.5–4°C higher than today and atmospheric CO₂ concentrations ranging from 360 to 420 ppm. Vegetation changes during the mPWP were significant, playing crucial role in through feedback mechanisms. Studying climate-vegetation interactions insights into their strength, temporal dynamics, extreme events. We plan...
Abstract We use theNorthern Hemisphere Tree-RingNetwork Development (NTREND) tree-ring database to examine the effects of using a small, highly-sensitive proxy network for paleotemperature data assimilation over last millennium. first evaluate our methods pseudo-proxy experiments. These indicate that spatial assimilations this are skillful in extratropical Northern and improve on previous NTREND reconstructions based Point-by-Point regression. also find method is sensitive climate model...
Abstract. Climate field reconstruction (CFR) refers to the estimation of spatiotemporal climate fields (such as surface temperature) from a collection pointwise paleoclimate proxy datasets. Such reconstructions can provide rich information on dynamics and an out-of-sample validation models. However, most CFR workflows are complex time-consuming, they involve (i) preprocessing records, model simulations, instrumental observations; (ii) application one or more statistical methods; (iii)...
Abstract Paleoclimate reconstructions are now integral to climate assessments, yet the consequences of using different methodologies and proxy data require rigorous benchmarking. Pseudoproxy experiments (PPEs) provide a tractable transparent test bed for evaluating reconstruction methods their sensitivity aspects real-world networks. Here we develop dataset that leverages system models (PSMs) this purpose, which emulates essential physical, chemical, biological, geological processes...
Paleoclimate field reconstructions using data assimilation commonly employ large proxy networks, which are often composed of records that have a complex range sensitivities to the target climate field. This can introduce biases into or decrease overall skill. Smaller networks highly-sensitive proxies provide an alternative, but not been extensively used for and their strengths limitations less well understood. Here, we reconstruct Northern Hemisphere summer temperature anomalies over last...
The coding behavior of a software developer is not easily gathered and investigated. One accurate objective approach to utilize eye tracking techniques capture how developers' write code, use tools, read natural language documents instructions. A beneficial insight visualize the gazes that behavior. tasks, individual actions create complexity design experiments analyze gazes. Our systematic literature survey focuses on published methods for multiple types static dynamic changing stimuli,...
Paleoclimate reconstructions are increasingly central to climate assessments, placing recent and future variability in abroader historical context. Several estimation methods produce ensembles of trajectories that practitioners often want compare other ensembles, or deterministic produced by such as global models. Of particular interest so-called “offline” data assimilation (DA) methods, which have recently been adapted paleoclimatology, lack an explicit estimate reconstruction error...
Abstract The heterogeneous land surface spanning the Yellow River irrigated oasis and adjacent Kubuqi Ulan Buh Desert (Hetao area) in Inner Mongolia, China, has been noted to frequently generate planetary boundary layer convergence line (BLCL), providing an important source of low-level lifting for convection initiation (CI). As first field experiment collect comprehensive observations vegetation-contrast-resulting thermal circulations that consistently BLCLs lead CI, DEsert-oasis...
We developed a novel process to achieve ultra-thin gate dielectrics (EOT <0.7 nm) without involving nitrogen incorporation by engineering interface oxide thickness for sub 65nm high-performance logic technology node. Interfacial formation was suppressed the "oxygen-scavenging effect" using Hf metal on underlying HfO/sub 2/ device structure with appropriate annealing. The scavenging layer consumes oxygen sources leading further scaling still undoped 2/. Using this fabrication approach, EOT of...
Explosive volcanism imposes impulse-like radiative forcing on the climate system, providing a natural experiment to study response perturbation. Previous studies have identified disagreements between paleoclimate reconstructions and model simulations (GCMs) with respect magnitude recovery from volcanic cooling, questioning fidelity of GCMs, reconstructions, or both. Using paleoenvironmental data assimilation framework Last Millennium Reanalysis, this investigates causes disagreements, using...
A starved lubrication experiment and analytical model have been developed to investigate the friction condition transition (FCT) at interface between a piston ring cylinder liner with reciprocating test rig. To obtain solution for transition, phase space trajectories are used extract transient features of force. The three typical patterns conditions. irregular force different strokes is classified based on trajectories. When projection in enters into third pattern variation, this indicates...
Hafnium-based high-K dielectrics such as HfO/sub 2/, HfON and HfSiON have attracted a great deal of attention because their potential for successful integration into CMOS technology. However, channel mobility degradation, charge trapping reliability are major concerns. In this paper, we review our recent research results, namely, the characteristics, effects nitrogen on minority carrier lifetime mobility, Hf-Ti-O dielectrics. We investigated how N affects in Si substrate it relates to /spl...
Abstract. Climate field reconstruction (CFR) refers to the estimation of spatiotemporal climate fields (such as surface temperature) from a collection pointwise paleoclimate proxy datasets. The can provide rich information on dynamics and an out-of-sample validation models. However, most CFR workflows are complex timeconsuming, they involve: (i) preprocessing records, model simulations, instrumental observations, (ii) application one or more statistical methods, (iii) analysis visualization...
For the task of hanging clothes, learning how to insert a hanger into garment is crucial but has been seldom explored in robotics. In this work, we address problem inserting various unseen garments that are initially laid out flat on table. This challenging due its long-horizon nature, high degrees freedom garments, and lack data. To simplify process, first propose breaking several stages. Then, formulate each stage as policy low-dimensional action parameterization. overcome challenge...