1,043 research outputs found
Study on the spatial planning of the secondary station
During the Chinese Eastern Railway construction (1897-1903), a large amount of areas attached to railway station-located areas had been constructed and developed constantly, which therefore facilities the emergence of new type morphology of cluster arising from the railway in northeast China. And the townsâ morphology of this period had had the profound influence on the subsequent the townsâ development in northeast China. In this research, the author himself went to St. Petersburg in Russia and to check and collect files in Russian National History Archives, from which a large amount of basic files about city construction during the period of the construction of Chinese Eastern Railway have been generated; then, based on the above materials (ages and number), the research period (construction of Chinese Eastern Railway 1897-1903) , objects (railway stations along the main lines of Chinese Eastern Railway:) and sample (Station Hailar and Suifenhe )are determined; Thirdly, the historic planning drawings and townsâ construction for two stations are translated to extract the planning information ,earlier city construction, social economy development , location features, land layout, texture of street profile, street transport, buildingsâ texture, landscape greening and other basic elements of townsâ morphology. Two towns are compared to conclude the typical structural pattern and morphology. Ultimately, Russian style station in Suifenhe City is taken to conduct field research and empirical analysis and explicit the conservation content of historic features as well as propose the conservation ides depending on the principles of completeness and authenticity. After hundreds of years, the Russian style stations during the Chinese Eastern Railway have developed into to the commercial centers, which dominate in the modern city. Although the features of earlier Russian style stations have been broken, these centers still demonstrate strong sense of environment and landscape as Russian style colonial city. This research intends to explore the planning content of earlier stations to restores the planning elements of earlier cities with the ultimate aim to reveal the historical landscape of the towns, which is greatly significant to the conservation of urban historical features
A 5-Gb/s 66 dB CMOS variable-gain amplifier with reconfigurable DC-offset cancellation for multi-standard applications
This paper proposes a variable gain amplifier (VGA) with reconfigurable DC-offset cancellation (DCOC) for multi-standard applications. In this design, a cell-based design method and some bandwidth extension technologies are adopted to achieve a high data rate and a wide gain control range simultaneously. In addition, the DCOC having a tunable lower-cutoff frequency can make an optimum compromise between BER and SNR according to the specified baseband standard. The measurements show that the VGA achieves a gain control range from â6 dB to 60 dB, a bandwidth beyond 3 GHz, and a tunable lower-cutoff frequency from 0 to 300 kHz. When entering a 2 23 â1 pseudo-random bit sequence signal at 5 Gb/s, the VGA consumes 17 mW from a 1.2-V supply and the output data peak-to-peak jitter is less than 40 ps. The VGA is fabricated in a 90-nm CMOS process with a chip size (including all pads) of 0.52Ă0.5 mm 2
Flocculation performance of anionic starch in oil sand tailings
Abstract
A series of carboxymethyl starches (CMSs), with various degrees of substitution from 0.1 to 0.79, were synthesized and selected as a model to study the feasibility of using natural polymers as flocculants for oil sand tailings treatment. The flocculation performance of modified CMS in kaolin clay suspensions and oil sand tailings was evaluated in terms of settling rate, solids content, capillary suction time, and specific resistance to filtration of the sediment phase. It was found that the synthesized CMS effectively accelerates settling of kaolin suspensions and oil sand fine tailings, thus demonstrating the feasibility of this application
Speech-to-Speech Translation with Discrete-Unit-Based Style Transfer
Direct speech-to-speech translation (S2ST) with discrete self-supervised
representations has achieved remarkable accuracy, but is unable to preserve the
speaker timbre of the source speech during translation. Meanwhile, the scarcity
of high-quality speaker-parallel data poses a challenge for learning style
transfer between source and target speech. We propose an S2ST framework with an
acoustic language model based on discrete units from a self-supervised model
and a neural codec for style transfer. The acoustic language model leverages
self-supervised in-context learning, acquiring the ability for style transfer
without relying on any speaker-parallel data, thereby overcoming the issue of
data scarcity. By using extensive training data, our model achieves zero-shot
cross-lingual style transfer on previously unseen source languages. Experiments
show that our model generates translated speeches with high fidelity and style
similarity. Audio samples are available at http://stylelm.github.io/ .Comment: 5 pages, 1 figure. submitted to ICASSP 202
SPA: A Graph Spectral Alignment Perspective for Domain Adaptation
Unsupervised domain adaptation (UDA) is a pivotal form in machine learning to
extend the in-domain model to the distinctive target domains where the data
distributions differ. Most prior works focus on capturing the inter-domain
transferability but largely overlook rich intra-domain structures, which
empirically results in even worse discriminability. In this work, we introduce
a novel graph SPectral Alignment (SPA) framework to tackle the tradeoff. The
core of our method is briefly condensed as follows: (i)-by casting the DA
problem to graph primitives, SPA composes a coarse graph alignment mechanism
with a novel spectral regularizer towards aligning the domain graphs in
eigenspaces; (ii)-we further develop a fine-grained message propagation module
-- upon a novel neighbor-aware self-training mechanism -- in order for enhanced
discriminability in the target domain. On standardized benchmarks, the
extensive experiments of SPA demonstrate that its performance has surpassed the
existing cutting-edge DA methods. Coupled with dense model analysis, we
conclude that our approach indeed possesses superior efficacy, robustness,
discriminability, and transferability. Code and data are available at:
https://github.com/CrownX/SPA.Comment: NeurIPS 2023 camera read
Interplay between multiple charge-density waves and the relationship with superconductivity in PdHoTe
HoTe, a member of the rare-earth tritelluride (Te) family, and
its Pd-intercalated compounds, PdHoTe, where superconductivity (SC)
sets in as the charge-density wave (CDW) transition is suppressed by the
intercalation of a small amount of Pd, are investigated using angle-resolved
photoemission spectroscopy (ARPES) and electrical resistivity. Two
incommensurate CDWs with perpendicular nesting vectors are observed in
HoTe at low temperatures. With a slight Pd intercalation ( = 0.01),
the large CDW gap decreases and the small one increases. The momentum
dependence of the gaps along the inner Fermi surface (FS) evolves from
orthorhombicity to near tetragonality, manifesting the competition between two
CDW orders. At = 0.02, both CDW gaps decreases with the emergence of SC.
Further increasing the content of Pd for = 0.04 will completely suppress
the CDW instabilities and give rise to the maximal SC order. The evolution of
the electronic structures and electron-phonon couplings (EPCs) of the multiple
CDWs upon Pd intercalation are carefully scrutinized. We discuss the interplay
between multiple CDW orders, and the competition between CDW and SC in detail.Comment: 6 pages, 5 figure
Picosecond Photovoltaic Response in Tilted Lanthanum Doped Manganite Films
Anisotropic picosecond photovoltaic responses were observed in lanthanum doped manganite La Ca 1â MnO 3 ( = 0.67 and 0.4) thin films, which were deposited on miscut LaSrAlO 4 substrates under ultraviolet pulsed laser irradiation without external bias. The 10%-90% rise time and the full width at half maximum of La 0.67 Ca 0.33 MnO 3 were 470 and 585 ps, respectively, and those of La 0.4 Ca 0.6 MnO 3 were 220 and 515 ps. The photovoltage sensitivities of La 0.67 Ca 0.33 MnO 3 and La 0.4 Ca 0.6 MnO 3 , which are sensitive to the concentrations of lanthanum of the samples, are 0.28 V/mJ and 3.47 V/mJ, respectively. The photosensitivity in the films deposited on MgO is higher than that in those deposited on LaSrAlO 4 substrates, for it has a big lattice mismatch. These results should open a route for the application of lanthanum doped manganite as an ultrafast photodetector material
Maize ZmHSP90 plays a role in acclimation to salt stress
Background Maize is sensitive to salt stress, especially during the germination and seedling stages. Methods We conducted germination experiments on 60 maize materials under salt stress, and screened out the most salt-tolerant and salt-sensitive varieties based on germination indicators. Afterwards, transcriptome analysis was performed to screen for key regulators in the plumule and flag leaf at the germination and seedling stages, respectively. Following that, transgenic tobacco was developed to expose the roles and mechanisms of the candidate genes, enabling a deeper investigation of their functions. Results Out of the 60 inbred lines of maize, â975-12â exhibits the highest level of salt tolerance, while âGEMS64â displays the lowest. The application of salt stress resulted in a significant increase in the levels of antioxidant enzymes in both â975-12â and âGEMS64â. ABA signal transduction and jasmonic acid pathways were the pathways that mainly affected by salt stress. In addition, a significant finding has been made indicating that when exposed to high levels of salt stress, the expression of ZmHSP90 in â975-12â increased while in âGEMS64â decreased. Furthermore, in tobacco plants overexpressing ZmHSP90, there was an increase in antioxidant enzyme activity associated with salt tolerance. ZmHSP90 enhanced the expression levels of NtSOS1, NtHKT1, and NtNHX1 as compared to those in the salt treatment, causing the maintenance of Na+ and K+ homeostasis, suggesting that high expression of ZmHSP90 was conducive to regulate Na+ transporters to maintain K+/Na+ balanced in tobacco
Endovascular Repair of Ascending Aortic Dissection A Novel Treatment Option for Patients Judged Unfit for Direct Surgical Repair
ObjectivesThis paper sought to report the outcomes of patients who are considered unfit for urgent surgical repair of ascending aortic dissections (AADs) who were treated using a novel endovascular repair strategy.BackgroundAAD is best treated by direct surgical repair. Patients who are unable to undergo this form of treatment have poor prognoses. Previously, clinical case reports related to endovascular repair of AAD have been controversial.MethodsBetween May 2009 and January 2011, 41 consecutive patients with AAD were treated in our institution. Fifteen patients were considered poor candidates for direct surgical repair and subsequently underwent the endovascular repair.ResultsThe nature of the referral process to our tertiary care facility made the median time from aortic dissection onset to treatment 25.5 days (range: 6 to 353 days). Dissections in 5 patients (33.3%) were considered acute, and those in 10 patients (66.7%) were considered chronic. The rate of successful stent-graft deployment was 100%, and there were no major morbidities or deaths in the perioperative period. Median follow-up was 26 months (range: 16 to 35 months). One new dissection occurred in the aortic arch at 3 months and was treated with a branched endograft. Significant enlargements of true lumens and decreases of false lumens and overall thoracic aorta were noted after the procedures.ConclusionsEndovascular repair of AAD was an appropriate treatment option in patients who were considered poor candidates for traditional direct surgical repair by the clinical criteria used in our institution. A larger series of cases with longer follow-up is needed to substantiate these results
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