53 research outputs found
Characterization of mineral and pore evolution under CO2-brine-rock interaction at in-situ conditions
Herein, a method of physical modeling of CO2-brine-rock interaction and in-situ characterization of mineral and pore evolution is established. The nested preparation and installation of the same sample with different sizes could protect and keep the integrality of the millimeter-size sample in conventional high-temperature and high-pressure reactors. This paper establishes a procedure to obtain the three-dimensional in-situ comparison of minerals and pores before and after the reaction. The resolution is updated from 5-10 µ m to 10 nm, which could be helpful for modeling CO2-brine-rock interaction in unconventional tight reservoirs. This method could be applied to CO2-enhanced oil recovery as well as CO2 capture, utilization, and storage scientific research. Furthermore, it may shed light on the carbon sequestration schemes in the Chinese petroleum industry.Cited as: Wu, S., Yu, C., Hu, X., Yu, Z., Jiang, X. Characterization of mineral and pore evolution under CO2-brine-rock interaction at in-situ conditions. Advances in Geo-Energy Research, 2022, 6(2): 177-178. https://doi.org/10.46690/ager.2022.02.0
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Microstructural and Mechanical Performance of Al2O3 Nanoparticle Reinforced 17-4 PH Stainless Steel Bulk Composite Parts Fabricated by Laser Engineered Net Shaping Process
Alloy 17-4 PH (AISI 630) is a precipitation-hardening martensitic stainless steel that has
been extensively employed in the industries of aerospace, marine, and chemical. In this study,
bulk parts of both 17-4 PH and Al2O3 reinforced 17-4 PH composites were fabricated on a steel
substrate by laser engineered net shaping (LENS) process to investigate the effects of Al2O3
reinforcements on the part performance. The 17-4 PH powders were pre-mixed with Al2O3
nanoparticles by ball milling. The microstructures of both parts were observed using scanning
electron microscopy and mechanical properties including microhardness and compressive
properties were evaluated by means of a Vickers microhardness tester and a universal tester,
respectively. The results indicate that Al2O3 reinforced 17-4 PH composite parts fabricated by
LENS process exhibited superior microhardness and compressive properties as compared to pure
17-4 PH parts.Mechanical Engineerin
U-Style: Cascading U-nets with Multi-level Speaker and Style Modeling for Zero-Shot Voice Cloning
Zero-shot speaker cloning aims to synthesize speech for any target speaker
unseen during TTS system building, given only a single speech reference of the
speaker at hand. Although more practical in real applications, the current
zero-shot methods still produce speech with undesirable naturalness and speaker
similarity. Moreover, endowing the target speaker with arbitrary speaking
styles in the zero-shot setup has not been considered. This is because the
unique challenge of zero-shot speaker and style cloning is to learn the
disentangled speaker and style representations from only short references
representing an arbitrary speaker and an arbitrary style. To address this
challenge, we propose U-Style, which employs Grad-TTS as the backbone,
particularly cascading a speaker-specific encoder and a style-specific encoder
between the text encoder and the diffusion decoder. Thus, leveraging signal
perturbation, U-Style is explicitly decomposed into speaker- and style-specific
modeling parts, achieving better speaker and style disentanglement. To improve
unseen speaker and style modeling ability, these two encoders conduct
multi-level speaker and style modeling by skip-connected U-nets, incorporating
the representation extraction and information reconstruction process. Besides,
to improve the naturalness of synthetic speech, we adopt mean-based instance
normalization and style adaptive layer normalization in these encoders to
perform representation extraction and condition adaptation, respectively.
Experiments show that U-Style significantly surpasses the state-of-the-art
methods in unseen speaker cloning regarding naturalness and speaker similarity.
Notably, U-Style can transfer the style from an unseen source speaker to
another unseen target speaker, achieving flexible combinations of desired
speaker timbre and style in zero-shot voice cloning
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Assessment of personal exposure to particulate air pollution: the first result of City Health Outlook (CHO) project
First paper of a series on the City Health Outlook (CHO) project, which aims to establish multi-scale, long-lasting, real-time urban environment and health monitoring networks. This paper is targeted at illustrating the characteristics of the participants and examining the effects of different covariates on personal exposure at various air pollution exposure levels
Optical dual-comb Vernier division of an octave-spanning Kerr microcomb
We measure the repetition rate of a 900 GHz octave-spanning soliton microcomb based on Vernier dual-comb frequency division implemented with two silicon nitride microresonator combs fabricated on the same wafer
Optical Division of an Octave-Spanning Comb on an All-Silicon Nitride Platform
We demonstrate optical frequency division of an octave-spanning large repetition rate microcomb to an electronically-detectable frequency in an all-silicon nitride dual microcomb platform
Vernier Microcombs for Integrated Optical Atomic Clocks
CMOS-compatible Kerr microcombs have drawn substantial interest as
mass-manufacturable, compact alternatives to bulk frequency combs. This could
enable deployment of many comb-reliant applications previously confined to
laboratories. Particularly enticing is the prospect of microcombs performing
optical frequency division in compact optical atomic clocks. Unfortunately, it
is difficult to meet the self-referencing requirement of microcombs in these
systems due to the THz repetition rates typically required for
octave-spanning comb generation. Additionally, it is challenging to spectrally
engineer a microcomb system to align a comb mode with an atomic clock
transition with sufficient signal-to-noise ratio. Here, we adopt a Vernier
dual-microcomb scheme for optical frequency division of a stabilized
ultranarrow-linewidth continuous-wave laser at 871 nm to a 235 MHz output
frequency. In addition to enabling measurement of the comb repetition rates,
this scheme brings the freedom to pick comb lines from either or both of the
combs. We exploit this flexibility to shift an ultra-high-frequency (100
GHz) carrier-envelope offset beat down to frequencies where detection is
possible and to place a comb line close to the 871 nm laser - tuned so that if
frequency-doubled it would fall close to the clock transition in
Yb. Moreover, we introduce a novel scheme which suppresses
frequency noise arising from interferometric phase fluctuations in our
dual-comb system and reduces the frequency instability down to our measurement
limit. Our dual-comb system can potentially combine with an integrated ion trap
toward future chip-scale optical atomic clocks
Vernier microcombs for high-frequency carrier envelope offset and repetition rate detection
Recent developments in Kerr microcombs may pave the way to a future with fully stabilized ultralow size, weight, and power consumption (SWaP) frequency combs. Nevertheless, Kerr microcombs are still hindered by a band-width/repetition rate trade-off. That is, the octave bandwidth needed for self-referencing is typically realized only with similar to THz repetition rates beyond the range of standard commercial photodetectors. The carrier envelope offset fre-quency fCEO is often likewise too high for detection. Dual-comb techniques for the measurement of THz repetition rates have made exciting progress, but the fCEO detection problem remains largely unaddressed. In this work, utilizing a Vernier dual-comb configuration, we demonstrate simultaneous detection of the electronically divided similar to 900 GHz rep-etition rate and similar to 97 GHz carrier envelope offset frequency of an octave-spanning microcomb. This, in turn, could help usher optical atomic clocks, low-noise microwave generators, and optical frequency synthesizers into various real-world applications.Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article\u27s title, journal citation, and DOI
CodeFuse-13B: A Pretrained Multi-lingual Code Large Language Model
Code Large Language Models (Code LLMs) have gained significant attention in
the industry due to their wide applications in the full lifecycle of software
engineering. However, the effectiveness of existing models in understanding
non-English inputs for multi-lingual code-related tasks is still far from well
studied. This paper introduces CodeFuse-13B, an open-sourced pre-trained code
LLM. It is specifically designed for code-related tasks with both English and
Chinese prompts and supports over 40 programming languages. CodeFuse achieves
its effectiveness by utilizing a high quality pre-training dataset that is
carefully filtered by program analyzers and optimized during the training
process. Extensive experiments are conducted using real-world usage scenarios,
the industry-standard benchmark HumanEval-x, and the specially designed
CodeFuseEval for Chinese prompts. To assess the effectiveness of CodeFuse, we
actively collected valuable human feedback from the AntGroup's software
development process where CodeFuse has been successfully deployed. The results
demonstrate that CodeFuse-13B achieves a HumanEval pass@1 score of 37.10%,
positioning it as one of the top multi-lingual code LLMs with similar parameter
sizes. In practical scenarios, such as code generation, code translation, code
comments, and testcase generation, CodeFuse performs better than other models
when confronted with Chinese prompts.Comment: 10 pages with 2 pages for reference
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