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Constraints on what controls millennial-scale basin-wide denudation across mountain belts, Asia

Science China Earth Sciences 2025年第1期68卷 74-93页

作者： ye yang Steven A.BINNIE Sheng XU Cong-Qiang LIU Tibor J.DUNAI Institute of Surface-Earth System Science School of Earth System Science Tianjin University Institute of Geology and Mineralogy University of Cologne

The terrestrial cosmogenic nuclide dataset consisting of 123310Be measurements of fluvial sediment samples across the Asian mountain belts is used to constrain the influence of climate,tectonics and topography on Earth-surface denudation processes.10Be-derived basin-wide denudation rates were recalculated using a Monte Carlo simulation approach that relied on pixel-by-pixel production *** rates derived span four orders of magnitude,from 7.4±0.7 mm kyr-1（1σ;Central Tibetan Plateau） to 9,646744+777mm kyr-1（1σ;Southern Tibetan Plateau）,with a median of 186 mm *** our results with the traditional basin-wide production rate scaling model using a centroid coordinate and mean elevation,suggests that 96.6%of production rates will be underestimated using the latter method,especially for basins with a large *** bias between both methods reaches as large as 40%,caused by basin hypsometry and the nonlinear scaling of production rate with elevation and *** of the correlations between uniformly recalculated denudation rates and tectonics,climate,topography and rock lithology will facilitate the extrapolation of denudation rates in unknown basins using available *** the perspective of local scales,precipitation coupled with neotectonics-driven landslides is likely the most influential factor in subtropical Taiwan Island,while topography primarily constrains surface denudation rates in the eastern Tibetan Plateau within a narrow range of *** highland regions with glacier coverage,such as the Pamir,central and southern Tibetan Plateau high denudation rates are affected by glaciation,whereas lower precipitation and high erosion base level may limit river incision and evolving relief in the Central Tibetan *** contrast to local-scale findings highlighting a dominant factor constraining denudation rate,our large-scale quantitative analyses across the Asian mountain belts finds that （1） topographic metrics including

关键词： 10Be-derived denudation rate Climate change Tectonic uplift Topographic gradient Asian mountains

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Drone-YOLOv7: small target detection in UAV remote sensing images using YOLOv7-tiny with dynamic head

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Optoelectronics Letters 2025年

作者： yang ye yang Sen Tong Jigang Wang Zenghui Tianjin University of Technology Department of Electrical Engineering， University of South Africa

In the task of detecting targets in unmanned aerial vehicles （UAVs） aerial images， the challenge arises from small size and wide scale span of targets， making their location， extraction and feature distinction difficult. Similar categories are susceptible to confusion. To address these issues， an improved YOLOv7-tiny aerial detection algorithm is proposed. Firstly， to improve the identification of small targets， a small target detection layer is added while removing the maximum target detection layer to enhance the localization ability of small targets and make the model lightweight. Secondly， a CBAM （Convolutional Block Attention Module） attention mechanism is incorporated at the connection between the backbone and neck to focus on the target area and eliminate interference. Additionally， to further enhance the classification and location capabilities of the targets， the detection head is replaced with a dynamic head （DYHead） with a unified channel number to fuse scale， space and task awareness in a single module. Finally， to overcome the difficulty of extracting features， the neck is replaced with a CS-FPN （Cross-Scale Feature Pyramid Network） structure with cross-scale connections to amplify feature fusion. Comparative experiments on the VisDrone2021 dataset show that the proposed model can improve mAP50and mAP0.5:0.95by 8.3% and 6.1%， respectively， compared to the original YOLOv7-tiny model， and significant improvements are also observed on CARPK and SeaDronesSee datasets.

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General relative error criterion and M-estimation

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Frontiers of Mathematics in China 2013年第3期8卷 695-715页

作者： Ying yang Fei ye Department of Mathematical Sciences Tsinghua University Beijing 100084 China

Relative error rather than the error itself is of the main interest in many practical applications. Criteria based on minimizing the sum of absolute relative errors （MRE） and the sum of squared relative errors （RLS） were proposed in the different areas. Motivated by K. Chen et al.＇s recent work [J. Amer. Statist. Assoc., 2010, 105： 1104-1112] on the least absolute relative error （LARE） estimation for the accelerated failure time （AFT） model, in this paper, we establish the connection between relative error estimators and the M-estimation in the linear model. This connection allows us to deduce the asymptotic properties of many relative error estimators （e.g., LARE） by the well-developed M-estimation theories. On the other hand, the asymptotic properties of some important estimators （e.g., MRE and RLS） cannot be established directly. In this paper, we propose a general relative error criterion （GREC） for estimating the unknown parameter in the AFT model. Then we develop the approaches to deal with the asymptotic normalities for M-estimators with differentiable loss functions on R or R／{0} in the linear model. The simulation studies are conducted to evaluate the performance of the proposed estimates for the different scenarios. Illustration with a real data example is also provided.

关键词： Relative error accelerated failure time model M-estimation asymptotic normality general loss function

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Bounds for Average toward the Resonance Barrier for GL(3)×GL(2)Automorphic Forms

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Acta Mathematica Sinica,English Series 2023年第9期39卷 1667-1683页

作者： Huan Qin yang Bo ye San Diego State University—Imperial Valley CalexicoCA92231USA Department of Mathematics The University of IowaIowa CityIowa52242-1419USA

Let f be a fixed Maass form for SL_3(Z)with Fourier coefficients A_(f)(m,n).Let g be a Maass cusp form for SL_2(G)with Laplace eigenvalue(1/4)+k^(2) and Fourier coefficientλ_(g)(n),or a holomorphic cusp form of even weight *** by S_(X)(f×g,α,β)a smoothly weighted sum of A_(f)(1,n)λ_(g)(n)e(αn~β)for X 0 are fixed real *** subject matter of the present paper is to prove non-trivial bounds for a sum of S_(X)(f×g,α,β)over g as k tends to∞with *** bounds for average provide insight for the corresponding resonance barriers toward the Hypothesis S as proposed by Iwaniec,Luo,and Sarnak.

关键词： Maass cusp form holomorphic cusp form Hypothesis S resonance barrier Kuznetsov trace formula Petersson's formula Voronoi's summation formula

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Celastrol promotes apoptotic cell death in children neuroblastoma cells through caspases dependent pathway

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Journal of Traditional Chinese Medicine 2022年第6期42卷 877-884页

作者： yang ye ZHANG Aihui LI Anmao Department of Thoracic Surgery Xi'an Children's HospitalXi'an 710003China

OBJECTIVE: To investigate the in-depth pharmacological mechanisms of celastrol in children neuroblastoma treatment. METHODS: In the current study, we examined the effects of celastrol on children neuroblastoma cells viability and proliferation by cell counting kit-8 assay and colony formation assay. Annexin V-FTIC and PI staining were applied to determine cell apoptosis after celastrol treatment. ROS generation levels were examined by 2′, 7′-dichloroflfluorescin diacetate. RESULTS: We found that celastrol could suppress the proliferation of children neuroblastoma cells with few effects on normal cell lines in vitro. Further mechanisms studies have shown that celastrol inhibited cell cycle progression and induced cell apoptosis in QDDQ-NM and SH-SY5Y cells. In addition, ROS production might involve in celastrol-mediated apoptotic cell death in children neuroblastoma cells by activating caspase death pathway. CONCLUSIONS: Our findings demonstrated that celastrol could promote ROS generation-induced apoptosis in neuroblastoma cell by activating caspase death pathway. These findings suggested that celastrol might be a potential novel anti-neuroblastoma agent with minor cytotoxicity.

关键词： neuroblastoma child celastrol apoptosis poly(ADP-ribose)polymerases

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High-sensitive cardiac troponin T

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Journal of Geriatric Cardiology 2013年第1期10卷 102-109页

作者： Ru-Yi Xu Xiao-Fa Zhu ye yang Ping ye Department of Geriatric Cardiology Navy General Hospital No.6 Fucheng Road Beijing 100048 China Department of Geriatric Cardiology Chinese PLA General Hospital No.28 Fuxing Road Beijing 100853 China

Cardiac troponin is the preferred biomarker for the diagnosis of acute myocardial infarction (AMI). The recent development of a high-sensitive cardiac troponin T (hs-cTnT) assay permits detection of very lowlevels of cTnT. Using the hs-cTnT assay improves the overall diagnostic accuracy in patientswith suspected AMI, while a negative result also has a high negative predictive value. The gain in sensitivitymay be particularly important in patientswith a short duration from symptom onset to *** of cardiac troponin T with the hs-cTnT assay may provide strong prognostic information in patients with acute coronary syndromes, stable coronary artery disease, heart failure and even in the general population; however, increased sensitivity comes at a cost of decreased specificity. Serial testing, aswell as clinical context and co-existing diseases, are likely to become increasingly important for the interpretation of hs-cTnT assay results.

关键词： Acute myocardial infarction Risk stratification Troponin T

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Jittor: a novel deep learning framework with meta-operators and unified graph execution

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Science China(Information Sciences) 2020年第12期63卷 118-138页

作者： Shi-Min HU Dun LIANG Guo-ye yang Guo-Wei yang Wen-yang ZHOU Department of Computer Science and Technology Tsinghua University Beijing National Research Center for Information Science and Technology

This paper introduces Jittor, a fully just-in-time(JIT) compiled deep learning framework. With JIT compilation, we can achieve higher performance while making systems highly customizable. Jittor provides classes of Numpy-like operators, which we call meta-operators. A deep learning model built upon these meta-operators is compiled into high-performance CPU or GPU code in real-time. To manage metaoperators, Jittor uses a highly optimized way of executing computation graphs, which we call unified graph execution. This approach is as easy to use as dynamic graph execution yet has the efficiency of static graph execution. It also provides other improvements, including operator fusion, cross iteration fusion, and unified memory.

关键词： deep learning framework meta-operator unified graph execution JIT compilation generative adversarial network

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Monitoring impact of mefenacet treatment on soil microbial communities by PCR-DGGE fingerprinting and conventional testing procedures

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Journal of Environmental Sciences 2006年第2期18卷 373-378页

作者： ye yang-fang MIN Hang LU Zhen-mei College of Life Science and Biotechnology Ningbo University Ningbo 315211 China College of Life Science Zhejiang University Hangzhou 310029 China

The effect of acetanilide herbicide mefenacet on soil microbial communities was studied using paddy soil samples with different short-term treatments. The culturable bacteria （plate counts）, dehydrogenase activity and changes in community structure （denaturing gradient gel electrophoresis （DGGE） analysis） were used for biological community assessments. Mefenacet was a significant stimulus to cultural aerobic bacteria and dehydrogenase activity while Sphingobacterium multivorum Y1, a bacterium efficiently degrading the mefenacet, only induced the increasing colony-forming unit （CFU） of bacteria but little effect on dehydrogenase activity during the whole experiment. The degree of similarity between the 16S rDNA profiles of the communities was quantified by numerically analyzing the DGGE band patterns. Similarity dendrograms showed that the microbial community structures of the mefenacet-treated and non-treated soils were not significantly different. But supplement of S. multivorum Y1 could increase the diversity of the microbial community in the mefenacet-polluted paddy soil. This work is a new attempt to apply the S. multivorum Y1 for remediation of the mefenacet-polluted environments.

关键词： denaturing gradient gel electrophoresis(DGGE) soil microbial diversity mefenacet dehydrogenase

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Isocartormin, a novel quinochalcone C-glycoside from Carthamus tinctorius

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Acta Pharmaceutica Sinica B 2017年第4期7卷 527-531页

作者： Feng Li Zhisheng He yang ye State Key Laboratory of Drug Research and Natural Products Chemistry Department Shanghai Institute of Materia Medica Chinese Academy of Sciences Department of Molecular and Cellular Biology Baylor College of Medicine

A new semi-quinonechalcone C-glycoside isocartormin along with cartormin and saf fl omin C were isolated from the water extract of Carthamus tinctorius L. The structure of isocartormin was determined by extensive analysis of HR-MS, 1D-and 2D NMR data, and by comparison with those of cartormin reported previously by our group. Isocartormin was identified as a diastereoisomer of cartormin with a reverse configuration at C-18.

关键词： Carthamus tinctorius Compositae Semi-quinone chalcone Cartormin Isocartormin

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Mechanical properties and microstructure of an α+β titanium alloy with high strength and fracture toughness

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Rare Metals 2009年第4期28卷 346-349页

作者： YU yang HUI Songxiao ye Wenjun XIONG Baiqing State Key Laboratory for Fabrication and Processing of Nonferrous Metals General Research Institute for Nonferrous Metals Beijing 100088 China

The Ti-Al-Sn-Zr-Cr-Mo-V-Si （Ti-62A） alloy, an alpha-beta alloy with high strength and fracture toughness, is currently used as an advanced structural material in aerospace and non-aerospace applications. Thermo-mechanical processes can be used to optimize the relationship between its strength and fracture toughness. A Ti-62A alloy bar can be machined through a transus β-forged plus α＋β solution treated and aged specimen with a lamellar alpha microstructure. The effects of heat treatment on the mechanical properties were discussed. Heat treatment provided a practical balance of strength, fracture toughness, and fatigue crack growth resistance. A comparison of the Ti-62A alloy with the Ti-62222S alloy under the same thermo-mechanical processing conditions showed that their properties are at the same level.

关键词： titanium alloys mechanical properties strength toughness fatigue crack growth rate

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