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Correlation Between the Arabian Sea Surface Temperature and the Onset Period of South Asian Summer Monsoon with Trend Analysis on the Intensity

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Journal of Ocean University of China 2023年第4期22卷 930-938页

作者： HAN Shuzong WANG Ruoqi ZHANG Shuiping chen zhentao College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China College of Ocean Science and Technology Hainan Tropical Ocean UniversitySanya 572000China Yazhou Bay Innovation Institute Hainan Tropical Ocean UniversitySanya 572000China College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China

The long-term trend of the Arabian Sea surface temperature(ASST)during the formation of the South Asian summer monsoon(SASM)is discussed in this *** April to June,ASST changed from a meridional gradual distribution to a spatially uniform distribution and then to a zonal gradual *** South Asian summer monsoon intensity(SASMI)and South Asian summer monsoon direction(SASMD)indicate that the variation of the ASST is highly related to the formation of the SASM during the summer monsoon period and can contribute to the spread of the SASM from the Southwest Arabian Sea throughout all of South *** of the correlation between the ASST and SASMI for the same month and its adjacent months were the same,and the areas of the positive correlation between the ASST and SASMI significantly increased from May–June as compared to April–*** maximum correlation coefficient was *** results of the ASST and SASMD for the same month and its adjacent months were substantially ***,the ASST and SASMD for May and April also showed a high positive correlation with a maximum correlation coefficient of 0.61 in the southwestern Arabian *** of the ASST had a spatially consistent and significant upward trend with a mean increase of 0.6℃during the summer monsoon period from 1980 to 2020(between April and September),whereas the SASMI had a strengthening trend along the western and southwestern regions of the Arabian Sea and the southeastern region of the Arabian ***,the rest of the study regions showed a declining ***,the entire study region showed a slight downward trend,and the average value decreased by 0.02ms^(−1).

关键词： Arabian Sea surface temperature South Asian summer monsoon Indian summer monsoon air-sea interaction

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Coupled Mode of Net Heat Flux and Wind Explain the Formation of the Indian Ocean Dipole

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Journal of Ocean University of China 2023年第4期22卷 910-917页

作者： HAN Shuzong MIAO Bo ZHANG Shuiping chen zhentao PENG Bo College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China College of Marine Science and Technology Hainan Tropical Ocean UniversitySanya 572000China Yazhou Bay Innovation Institute Hainan Tropical Ocean UniversitySanya 572025China College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China Guangdong Eco-Engineering Polytechnic Guangzhou 510520China

Net heat flux,sea surface temperature(SST),and sea surface wind in the northern Indian Ocean were investigated using the TropFlux,ERA5,and J-OFURO3 datasets and correlation analysis,power spectrum analysis,and singular value decomposition(SVD)methods,*** relationships between net heat flux,SST,and sea surface winds were *** coupled modes of net heat flux and wind have been found to explain the SST variations in the Indian Ocean basin and the generation mechanism of the Indian Ocean Dipole(IOD).The correlation between net heat flux and wind is strongly *** SST lags the net heat flux and wind by approximately one month and has strong positive and negative correlations,*** correlation between net heat flux and wind in the northern Indian Ocean is not only seasonal but also regionally dependent on seasonal *** the SVD method,the important role of net heat flux in local sea-air interactions is discussed and identified as the initial perturbation that triggers the SST anomalies in the Southeast Indian Ocean,and the areas with key sea-air interactions and the generation mechanisms of the local sea-air interactions that form the IOD are determined.

关键词： IOD net heat flux heat flux dataset SVD South Asian Monsoon sea-air interaction

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Zemax-Based Optimum Structural Design of Probe of an Optical-Fiber Sensor

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第2期35卷 309-317页

作者： Hang Tianyuan Wang Xiaolei Liu Feng Ye Song chen zhentao Meteorological Oceanographic College National University of Defense Technology

Bubble plumes are important during the process of air-sea exchange,and optical-fiber phase detection is a suitable way to observe bubble plumes entrained by breaking *** paper designs a new optical-fiber probe(OFP)made of sapphire to overcome the limitations of existing materials(e.g.,high brittleness,poor corrosion resistance,and narrow bandwidth)and thereby enhance the detection performance of the OFP by improving its *** on total internal reflection and light refraction,a simulation model of the probe is established in the Zemax optical design software to optimize the probe tip and matching mode of the two probe *** results show that the optimum OFP tip is a conical sapphire one with a cone angle of 35°.Tests are then conducted on a bespoke OFP sensor,the results of which are consistent with those predicted *** simulation results lay the foundation for the integrated design of OFP sensors and the optimization of their internal *** findings could also be applied to OFPs with multiple tips.

关键词： bubble measurement optical-fiber probe optimum design light transmission test Zemax optical simulation

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Applied Mathematics(A Journal of Chinese Universities) 1994年第3期9卷 231-236页

作者： chen zhentao(Department of Mathematics, Xiangtan University, Xiangtan 411105) Department of Mathematics Xiangtan University Xiangtan

In this paper we study a class of degenerate nonlinear elliptic systems with homogeneous Dirichlet boundary conditions by the monotone iteration method. The existence and uniqueness of the positive solution of such a system are *** particular,conditions which ensure that the iteration process converges to the unique solution are given.

关键词： Degenerate elliptic system upper and lower solutions monotone iteration method.

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Numerical Investigation of Connection Performance of Timber-Concrete Composite Slabs with Inclined Self-Tapping Screws under High Temperature

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Journal of Renewable Materials 2022年第1期10卷 89-104页

作者： zhentao chen Weidong Lu Yingwei Bao Jun Zhang Lu Wang Kong Yue Department of Civil Engineering Nanjing Tech UniversityNanjing211816China Architectural Design and Research Institute of Nanjing Tech University Nanjing210009China

The timber-concrete composite(TCC)slabs have become a preferred choice of floor systems in modern multi story timber *** TCC slab consisted of timber and a concrete slab which were commonly connected together with inclined self-tapping screws(STSs).To more accurately predict the fire performance of TCC slabs,the mechanical behavior of TCC connections under high temperature was investigated by numerical simulation in this *** interface slip of TCC connections was simulated by a proposed Finite Element(FE)model at room temperature,and different diameter and penetration length screws were *** effectiveness of this FE model was validated by comparing with the existing experimental ***,the sequentially coupling thermal stress analyses of this model were conducted,and the relationship between the reduction coefficient of connection performance and the effective penetration length of screws was *** study gave the fit-ting expressions for the reduction coefficient of slip modulus and joint ***,the numerical investiga-tions of the fire performance of TCC slabs considering the char fall-off of Cross Laminated Timber(CLT)were performed to verify the effectiveness of the proposed reduction *** the fire-resistance time with experimental results showed deviation of the proposed model was−14.02%.

关键词： Cross laminated timber finite element fire resistance shear connection timber-concrete composite

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Synthesis of alumina-nitrogen-doped carbon support for CoMo catalysts in hydrodesulfurization process

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Chinese Journal of Chemical Engineering 2022年第1期35卷 392-402页

作者： zhentao chen Yaxin Liu Jian chen Yang Zhao Tao Jiang Fangyu Zhao Jiahuan Yu Haoxuan Yang Fan Yang Chunming Xu State Key Laboratory of Heavy Oil Proceeing China University of PetroleumChangpingBeijing 102249China

More stringent environmental legislation imposes severe requirements to reduce the sulfur content in diesel to ultra-low levels with high efficient *** this paper,a series of CoMo/NDC@alumina catalysts were synthesized by combination of the chemical vapor deposition of nitrogen-doped carbon(NDC)using 1,10-phenanthroline and co-impregnation of Mo and Co active *** optimal catalyst with additive of 25%1,10-phenanthroline was screened by a series of property characterization and the hydrodesulfrization(HDS)active *** amount of“CoMoS”active phase of the optimal CoMo/C3 catalyst increased 5.3%as compared with the CoMo/c-Al_(2)O_(3).The introduction of NDC improved the sulfidation degree of Mo by 21.8%as compared to the CoMo/c-Al_(2)O_(3) catalyst,which was beneficial to form more active *** HDS conversion of the NDC supported catalysts are higher than CoMo/c-Al_(2)O_(3) whether for the dibenzothiophene(DBT)or 4,6-dimethyl dibenzothiophene(4,6-DMDBT).Further hydroprocessing evaluation with Dagang diesel revealed that the CoMo/C3 catalyst possessed higher HDS property and the removal rate of DBTs in the diesel increased by 4%–11%as compared to the CoMo/c-Al_(2)O_(3) catalyst.

关键词： Nitrogen-doped carbonmaterials Catalyst hydrodesulfurization(HDS) Diesel Dibenzothiophene(DBT)

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重质油在孔道内扩散传质的研究进展

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化工学报 2016年第1期67卷 165-175页

作者：陈振涛徐春明中国石油大学化学工程学院重质油国家重点实验室北京102249

内扩散广泛存在于非均相催化反应过程中。重质油因为具有更大的分子尺寸和复杂的组成结构,其在催化转化过程中通过孔道的扩散传质受到显著影响,极大降低了重质油的高效转化和催化剂的有效利用。本文重点对重质油在孔道内扩散传质的主要... 详细信息

内扩散广泛存在于非均相催化反应过程中。重质油因为具有更大的分子尺寸和复杂的组成结构,其在催化转化过程中通过孔道的扩散传质受到显著影响,极大降低了重质油的高效转化和催化剂的有效利用。本文重点对重质油在孔道内扩散传质的主要研究方法(隔膜池、吸附扩散和反应动力学法)和现状、孔内扩散的影响因素以及内扩散对重质油催化转化的影响等方面进行了综述,还探讨了重质油催化转化过程中扩散传质研究的发展方向。

关键词：扩散传质重质油受限扩散分子构型缔合

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零长柱技术用于分子筛晶内扩散的研究进展

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化工学报 2016年第8期67卷 3170-3178页

作者：陈振涛武云徐春明中国石油大学化学工程学院重质油国家重点实验室北京102249

分子筛晶内扩散系数对吸附分离和择形催化具有重要的指导作用。概述了重量法、核磁共振法和分子模拟等分子筛晶内扩散研究方法,并对零长柱技术用于分子筛晶内扩散的原理和应用等方面研究进行了详细阐述,包括两种进样方式(气相进样和液... 详细信息

分子筛晶内扩散系数对吸附分离和择形催化具有重要的指导作用。概述了重量法、核磁共振法和分子模拟等分子筛晶内扩散研究方法,并对零长柱技术用于分子筛晶内扩散的原理和应用等方面研究进行了详细阐述,包括两种进样方式(气相进样和液相进样)的单组分气相扩散、二元体系气相扩散和互扩散、液相扩散以及吸附扩散数学模型修正和拓展,还探讨了当前存在的一些问题,最后对零长柱法用于烃类分子在多孔材料中的扩散研究进行了展望。

关键词：零长柱扩散分子筛

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SC-FDE散射通信系统MMSE-HDFE-RISIC均衡

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西安电子科技大学学报 2022年第5期49卷 18-24页

作者：刘刚庞翔云陈镇涛郭漪西安电子科技大学综合业务网理论及关键技术国家重点实验室陕西西安710071

对流层散射通信作为一种超视距通信方式,因为保密性强、抗干扰强等,是未来战场的主要通信手段之一。单载波频域均衡技术能够有效解决功放发射峰值功率受限与信号多径衰落问题,在对流层散射通信中广泛应用。然而SC-FDE系统中,频域均衡后... 详细信息

对流层散射通信作为一种超视距通信方式,因为保密性强、抗干扰强等,是未来战场的主要通信手段之一。单载波频域均衡技术能够有效解决功放发射峰值功率受限与信号多径衰落问题,在对流层散射通信中广泛应用。然而SC-FDE系统中,频域均衡后的残留码间干扰会严重影响散射通信系统的误码性能。针对这一问题,基于最小均方误差准则,提出了一种适用于SC-FDE散射通信系统的MMSE-HDFE-RISIC均衡算法。该算法基于混合判决反馈均衡算法,通过频域估计残留码间干扰,再时域求和补偿,进一步减少了残留码间干扰对系统性能的影响。仿真分析表明,提出算法在散射信道下具有良好的误码性能。在QPSK调制下,以最小均方差来衡量,频域均衡算法性能提升约2.9 dB,相比传统混合判决反馈均衡算法性能提高约1 dB;在16QAM调制下,频域均衡算法的最小均方差性能提升约1.3 dB,相比传统混合判决反馈均衡算法性能提高约0.6 dB。

关键词：散射通信 SC-FDE系统 MMSE-HDFE-RISIC均衡

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Technology Combination Model and Its Application in Demonstration Village Construction of the Sino-Dutch Cooperation Project

Technology Combination Model and Its Application in Demonstr...

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作者： chen Xiaofu Luo zhentao China Association of Rural Energy Industry,Beijing 100083

In line with resources,demands and economic situation of the demonstration villages of four different areas,the Sino-the Netherlands Cooperation Project combined 12 items of renewable energy technologies into 5 combinations on which construction models are established for 4 types of *** the social and economic situation of the demonstration villages,the project construction activities are grouped as basic,demonstration and public goods *** categorization of technical models and project construction bears guiding significance to the integrated development of rural renewable energy in the future and it hence reflected the thoughts of integrated construction and sustainable development.

关键词： renewable energy technological model demonstration and study

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