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Facile fabrication of graphene/g-C_(3)N_(4) for electromagnetic wave absorption

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Nano Research 2024年第3期17卷 1687-1698页

作者： Qiang Su yunfei He Dongdong Liu Daguang Li Long Xia Xiaoxiao Huang Bo Zhong School of Materials Science and Engineering Harbin Institute of Technology WeihaiWeihai 264209China Weihai Yunshan Technology Co. Ltd.Weihai 264200China State Key Laboratory on Integrated Optoelectronics College of Electronic Science&EngineeringJilin UniversityChangchun 130012China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

With the development of the miniaturization of electronic equipment and lightweight weapon equipment,there are new requirements for electromagnetic wave absorption material(EMWAM).EMWAM has outstanding electromagnetic wave absorption properties and lightweight characteristics become an important direction of *** this study,graphene/g-C_(3)N_(4)(GGCN)EMWAM was first synthesized in situ by simple heat treatment,in which the g-C_(3)N_(4) had a porous structure and dispersed on the surface of *** impedance matching of the GGCN was well adjusted by decreasing the dielectric constant and attenuation constant due to the g-C_(3)N_(4) semiconductor property and the graphite-like *** EMW loss mechanism of GGCN was also analyzed by simulating GGCN’s electric field mode distribution and resistance loss power *** analysis result shows that the distribution of g-C_(3)N_(4) among GGCN sheets can produce more polarization effects and relaxation effects by increasing the lamellar ***,the polarization loss of GGCN could be increased successfully by porous g-C_(3)N_(4).Ultimately,the EMW absorption property of GGCN is optimized significantly,and GGCN exhibits excellent EMW absorption *** the thickness is 2 mm,the effective absorption bandwidth(EAB)can reach 4.6 GHz,and when the thickness is 4.5 mm,the minimum reflection loss(RLmin)at 4.56 GHz can reach-34.69 ***,the practical application of EMWAM was studied by radar cross-section(RCS)simulation,showing that GGCN has a good application prospect.

关键词： graphene/g-C_(3)N_(4) impedance matching simulation analysis dielectric loss excellent electromagnetic wave absorption

A deep learning-based approach for flow field prediction in a dual-mode combustor

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Propulsion and Power Research 2024年第2期13卷 178-193页

作者： Chen Kong Ziao Wang Fuxu Quan yunfei Li Juntao Chang Harbin Institute of Technology Harbin 150001China

Accurate acquisition of the distribution ofﬂow parameters inside the supersonic combustor is of great signiﬁcance for hypersonicﬂight *** is an interesting attempt to introduce a data-driven model to a supersonic combustor forﬂowﬁeld *** paper proposes a novel method for predicting theﬂowﬁeld in a dual-mode combustor.Aﬂowﬁeld prediction convolutional neural network with multiple branches is *** investiga-tions for a strut variable geometry combustor have been conducted to obtainﬂowﬁeld data for training the network as aﬂowﬁeld prediction ***ﬂowﬁeld data are obtained by changing the equivalent ratio,incomingﬂow condition and geometry of the supersonic *** Mach number distribution can be obtained from the trainedﬂowﬁeld predic-tion model using the combustor wall pressure as input with high *** accuracy ofﬂowﬁeld prediction is discussed in several ***,the combustion mode detection is im-plemented on the predictionﬂowﬁeld.ª2024 The *** services by Elsevier *** behalf of KeAi Communications ***.

关键词： Flowﬁeld prediction Deep learning(DL) Convolutional neural networks(CNNs) Data-driven model Dual-mode combustor Variable geometry combustor

INVERTING THE PYRAMID

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The World of Chinese 2019年第4期 50-55页

作者： HAN RUBO tan yunfei 不详

China’s pyramid schemes are known for their violent and cult-like behavior, preying on victims’ tight-knit social networks and fear of missing out. TWOC speaks to the former victims and grassroots activists who are ... 详细信息

关键词： Pyramid schemes every capitalist society Chinese chuanxiao

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GETTING SMART

The World of Chinese 2019年第5期 36-41页

作者： HAN RUBO tan yunfei 不详

Lack of drug education and an ultra-competitive society have led Chinese youths to abuse prescription amphetamines,sold on the black market as "smart drugs" that can aid their studies and *** will it take to stop this... 详细信息

关键词： smart drugs drug dependency

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CLOSE TO HOME

The World of Chinese 2020年第3期 52-59页

作者： MAI CANG tan yunfei 不详

My home village is called Taiping(“peace”).It is located at the junction of three counties and Uvo cities in southeastern Shandong pro'*** is an ordinary village in northern China with a history of 500 years and a p... 详细信息

关键词： ordinary peace southeastern

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智

The World of Chinese 2021年第1期 92-93页

作者： HUANG WEIJIA tan yunfei 不详

This character adds a little wisdom to our lives智者无惑,一生所求Xiang Yu(项羽),a warlord who rebelled against the failing Qin dynasty (221-206 BCE),once proposed a duel with his rival Liu Bang (刘邦)to decide who would be the future rulcr of *** Liu refused:"I’d rather match wits than strength(吾宁斗智,不能斗力Wu ning douzhi,buneng douli)," he stated,according to the Records of the Grand Historian(《史记》).

关键词： stated China. Grand

Investigation of oxy-fuel combustion for methane and acid gas in a diffusion flame

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Chinese Journal of Chemical Engineering 2024年第1期65卷 106-116页

作者： Songling Guo Xun Tao Fan Zhou Mengyan Yu Yufan Wu yunfei Gao Lu Ding Fuchen Wang Institute of Clean Coal Technology East China University of Science and TechnologyShanghai 200237China

Co-combustion of methane(CH4)and acid gas(AG)is required to sustain the temperature in Claus reaction *** this study,oxy-fuel combustion of methane and acid gas has been experimentally studied in a diffusion *** equivalence ratios(ER=1.0,1.5,2.0)and CH_(4)-addition ratios(CH_(4)/AG=0.3,0.5,0.7)were examined and the flame was interpreted by analyzing the distributions of the temperature and species concentration along central ***_(4)-AG diffusion flame could be classified into three sections namely initial reaction,oxidation and complex reaction *** oxidation of CH_(4)and H_(2)S was noted in the first section wherein H_(2)S was preferred and both were mainly proceeding decomposition and partial ***_(2)was formed at oxidation section together with obvious presence of H2 and ***,H2 and CO were inclined to be sustained under fuel rich condition in the complex reaction *** ER and increasing CH4/AG contributed to higher temperature,H_(2)S and CH_(4)oxidation and CO_(2)*** a growing trend for CH_(4)and AG to convert into H_(2),CO and SO_(2)could be *** this factor enhanced the generation of CS2 and COS in the flame inner core by interactions of CH4 and CO_(2)with sulfur *** was formed through the interactions of CO and CO_(2)with sulfur *** CS_(2)production directly relied on reaction of CH_(4)with sulfur *** concentration of COS was greater than CS_(2)since CS_(2)was probably inhibited due to the presence of H_(2).COS and CS_(2)could be consumed by further oxidation or other complex reactions.

关键词： Acid gas Methane Oxy-fuel combustion Oxidation Chemical analysis Carbon sulfides

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根（英文）

The World of Chinese 2019年第1期 94-95页

作者： HUANG WEIJIA tan yunfei 不详

On a drunken night,Shenzhen construction workers Old Zhao and Old Liu make a pact that,if either dies on the job,the other must arrange for his body to be sent *** morning,Liu doesn't wake up from the pair's latest bender,and Zhao,worried about the cost of cremation,decides to pretend his friend is still alive while accompanying the body on its journey home to Sichuan.

关键词：魅力汉字根 drunken night

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闹（英文）

The World of Chinese 2019年第3期 94-95页

作者： HUANG WEIJIA tan yunfei 不详

"The world is noisy Since we can no longer escape to the mountains, the only solution is to find peace within the hubbub," concluded the contemporary Chinese writer Wang Zengqi in his essay "Sitting in Quiet Leisure Here" Certainly;throughout Chinese history people have tried diflerent ways of finding peace in this bustling world. Late Ming poet Feng Menglong proposed that "one achieves real leisure only by seeking peace and quiet from noisy surroundings," while Mao Zedong, as a university student, was said to have intentionally studied in the busy streets of Changsha in order to better his ability to focus.

关键词： world mountains Zengqi