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Quantitative method to predict the energetics of helium-nanocavities interactions in metal systems based on electrophobic interaction

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Journal of Materiomics 2024年第3期10卷 725-737页

作者： Fengping Luo bowen Zhang Zhiying Gao Jia huang hong-bo Zhou Guang-hong Lu Fei Gao Yugang Wang Chenxu Wang State Key Laboratory of Nuclear Physics and Technology Center for Applied Physics and TechnologyPeking UniversityBeijing100871China Department of Physics Beihang UniversityBeijing100191China Department of Nuclear Engineering and Radiological Science University of MichiganAnn ArborMI48109USA

Energetics of helium-nanocavities interactions are crucial for unveiling underlying mechanisms of nanocavity evolution in nuclear ***,it becomes intractable and even not feasible to obtain these energetics via atomic simulations with increasing nanocavity size and increasing helium content in ***,a universal scaling law of helium-induced interaction energies in nanocavities in metal systems is proposed based on electrophobic interaction of *** on this scaling law and ab-initio calculations,a predictive method for binding energies of helium and displacement defects to nanocavities of arbitrary sizes and with different helium/vacancy ratios is established for BCC iron as a representative and validated by atomic *** predictive method reveals that the critical helium/vacancy ratio for helium-enhanced vacancy binding to nanocavities in-creases with increasing nanocavity size,and the helium/vacancy ratio giving the highest stability of nanocavities is about *** Ostwald ripening of nanocavities is delayed by helium to higher temper-atures due to reduced vacancy de-trapping rates from *** proposed scaling law can be generalized to many metal systems studied in the nuclear materials *** readily coupled into mesoscale models of irradiation damages,this predictive method facilitates clarifying helium role in cavity swelling of metallic nuclear materials.

关键词： Nanocavities Helium Electrophobic interaction Predictive method

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Microwave absorption properties of Ag naowires/carbon black composites

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Chinese Physics B 2017年第2期26卷 349-356页

作者： Hai-Long huang Hui Xia Zhi-bo Guo Yu Chen hong-Jian Li School of Physics and Electronics Central South University Changsha 410083 China

The composite that can absorb the high-performance electromagnetic（EM） wave is constructed into a sandwiched structure composed of carbon black（CB）/ethylene-vinyl acetate（EVA） and Ag naowires（Ag NWs）. The Ag NWs sandwiched between two CB/EVA layers are used to improve the absorption properties of composite. The effects of EVA-to-CB weight ratio, concentration and diameter of Ag NWs with a thickness of 0.4 mm on microwave absorption are *** results indicate that for an EVA-to-CB weight ratio of 1：3, Ag NW concentration of 1.0 mg/100 m L, and average diameter of 56 nm, the reflection loss（RL） of the composite is below-10 d B in a frequency range of 9.3 Ghz–18.0 GHz, with the minimum values of-40.0 d B and-25.6 d B at 13.5 GHz and 15.3 GHz, respectively. A finite element method（FEM）is used for calculating the RL of the composite. The calculated results are in agreement with the experimental data.

关键词： microwave absorption sliver nanowires finite element method polymer-based composites

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Exploring the mechanisms of calcium carbonate deposition on various substrates with implications for effective anti-scaling material selection

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Petroleum Science 2024年第4期21卷 2870-2880页

作者： Lu Gong Fei-Yi Wu Ming-Fei Pan Jun huang Hao Zhang Jing-Li Luo hong-bo Zeng College of Science China University of PetroleumBeijing102249China Beijing Key Laboratory of Optical Detection Technology for Oil and Gas China University of PetroleumBeijing102249China Basic Research Center for Energy Interdisciplinary College of ScienceChina University of PetroleumBeijing102249China Department of Chemical and Materials Engineering University of AlbertaEdmontonAlbertaT6G 1H9Canada Key Laboratory of High Efficiency and Clean Mechanical Manufacture(Ministry of Education) School of Mechanical EngineeringShandong University

The unexpected scaling phenomena have resulted in significant damages to the oil and gas industries,leading to issues such as heat exchanger failures and pipeline *** is of practical and fundamental importance to understand the scaling mechanisms and develop efficient anti-scaling ***,the underlying surface interaction mechanisms of scalants(e.g.,calcite)with various substrates are still not fully *** this work,the colloidal probe atomic force microscopy(AFM)technique has been applied to directly quantify the surface forces between calcite particles and different metallic substrates,including carbon steel(CR1018),low alloy steel(4140),stainless steel(SS304)and tungsten carbide,under different water chemistries(i.e.,salinity and pH).Measured force profiles revealed that the attractive van der Waals(VDW)interaction contributed to the attachment of the calcium carbonate particles on substrate surfaces,while the repulsive electric double layer(EDL)interactions could inhibit the attachment *** salinity and acidic p H conditions of aqueous solutions could weaken the EDL repulsion and promote the attachment *** adhesion of calcite particles with CR1018 and4140 substrates was much stronger than that with SS304 and tungsten carbide *** bulk scaling tests in aqueous solutions from an industrial oil production process showed that much more severe scaling behaviors of calcite was detected on CR1018 and 4140 than those on SS304 and tungsten carbide,which agreed with surface force measurement ***,high salinity and acidic p H can significantly enhance the scaling *** work provides fundamental insights into the scaling mechanisms of calcite at the nanoscale with practical implications for the selection of suitable antiscaling materials in petroleum industries.

关键词： Scaling phenomenon Metallic substrates Surface forces Bulk scaling tests

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Effect of artificial tribological layer on sliding wear behavior of H13 steel

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Journal of Iron and Steel Research International 2017年第9期24卷 943-949页

作者： Zhen Cao Shu-qi Wang Ke-zhi huang bo Zhang Guo-hong Wen Qiu-yang Zhang Lan Wang School of Material Science and Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina

An artificial tribological layer was formed on the worn surface during sliding,through supplying MoS_2,Fe_2O_3 or their equiponderant mixtures onto the sliding interface of H13/GCr15 *** effect of this tribological layer on the wear behavior of H13 steel was *** worn surfaces and subsurfaces of H13 steel were thoroughly characterized by using X-ray diffraction（XRD）,scanning electron microscopy（SEM）and energy dispersive spectrometry（EDS）;the wear mechanisms were *** research results demonstrated that tribological layer did not exist during sliding of H13 steel with no additive,but it formed with the addition of MoS_2,Fe_2O_3 or their equiponderant *** there was no tribological layer,the wear rate rapidly increased with an increase of the *** this case,adhesive and abrasive wear *** the additives were supplied,the artificial tribological layer was observed to be immediately formed and stably existed on worn *** tribological layer presented an obvious protective function from wear and ***,the wear rate and friction coefficient were significantly ***_2 as tribological layer seemed to present more obvious protective function than Fe_2O_*** supplying their mixture,the artificial tribological layer possessed not only the load-carrying capacity of Fe_2O_3,but also the lubricative capacity of MoS_*** two simultaneous capacities could improve the friction and wear properties of H13 steel further.

关键词： H13 steel Artificial tribological layer Wear behavior Wear mechanism

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Surface available gravitational potential energy in the world oceans

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Acta Oceanologica Sinica 2022年第4期41卷 40-56页

作者： Ruixin huang bo Qiu Zhiyou Jing State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Woods Hole Oceanographic Institution Woods HoleMA 02543USA Department of Oceanography University of Hawaii at ManoaHonoluluHI 96822USA

Satellite altimetry observations,including the upcoming Surface Water and Ocean Topography mission,provide snapshots of the global sea surface high anomaly *** common practice in analyzing these surface elevation data is to convert them into surface velocity based on the geostrophic *** increasing horizontal resolution in satellite observations,sea surface elevation data will contain many dynamical signals other than the geostrophic velocity.A new physical quantity,the available surface potential energy,is conceptually introduced in this study defined as the density multiplied by half of the squared deviation from the local mean reference surface *** gravitational potential energy is an intrinsic property of the sea surface height field and it is an important component of ocean circulation energetics,especially near the sea *** connection with other energetic terms,this new variable may help us better understand the dynamics of oceanic circulation,in particular the processes in connection with the free surface data collected through satellite *** preliminary application of this concept to the numerically generated monthly mean Global Ocean Data Assimilation System data and Archiving,Validation,and Interpretation of Satellite Oceanographic altimeter data shows that the available surface potential energy is potentially linked to other dynamic variables,such as the total kinetic energy,eddy kinetic energy and available potential energy.

关键词： satellite altimetry surface available potential energy eddy kinetic energy

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Exploratory COVID-19 death risk score based on basic laboratory tests and physiological clinical measurements

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World Journal of Emergency Medicine 2022年第6期13卷 453-458页

作者： Gui-ying Dong Fei-fei Jin Qi huang Chun-bo Wu Ji-hong Zhu Tian-bing Wang Emergency Department Peking University People’s HospitalBeijing 100044China Trauma Center Peking University People’s HospitalKey Laboratory of Trauma and Neural Regeneration(PekingUniversity)Ministry of EducationBeijing100044China Department of Endocrinology and Metabolism Peking University People’s HospitalBeijing100044China

BACKGROUND:In the event of a sudden shortage of medical resources,a rapid,simple,and accurate prediction model is essential for the 30-day mortality rate of patients with ***:This retrospective study compared the characteristics of the survivals and non-survivals of 278 patients with *** regression analysis was performed to obtain the“COVID-19 death risk score”(CDRS)*** the area under the receiver operating characteristic(AUROC)curve and Hosmer-Lemeshow goodness-of-fit test,discrimination and calibration were *** validation was conducted using a regular bootstrap ***:A total of 63(22.66%)of 278 included patients *** logistic regression analysis revealed that high-sensitivity C-reactive protein(hsCRP;odds ratio[OR]=1.018),D-dimer(OR=1.101),and respiratory rate(RR;OR=1.185)were independently associated with 30-day *** was calculated as follows:CDRS=−10.245+(0.022×hsCRP)+(0.172×D-dimer)+(0.203×RR).CDRS had the same predictive effect as the sequential organ failure assessment(SOFA)and“confusion,uremia,respiratory rate,blood pressure,and age over 65 years”(CURB-65)scores,with AUROCs of 0.984 for CDRS,0.975 for SOFA,and 0.971 for CURB-65,*** CDRS showed good *** AUROC through internal validations was 0.980(95%confidence interval[CI]:0.965-0.995).Regarding the clinical value,the decision curve analysis of CDRS showed a net value similar to that of CURB-65 in this ***:CDRS is a novel,efficient and accurate prediction model for the early identification of COVID-19 patients with poor *** it is not as advanced as the other models,CDRS had a similar performance to that of SOFA and CURB-65.

关键词： COVID-19 30-day mortality Prediction model

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Crystallization of a Ti-based Bulk Metallic Glass Induced by Electropulsing Treatment

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Journal of Iron and Steel Research International 2016年第1期23卷 69-73页

作者： Yong-jiang huang Xiang CHENG hong-bo FAN Shi-song GUAN Zhi-liang NING Jian-fei SUN National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology School of Materials Science and Engineering Harbin Institute of Technology

The effect of electropulsing treatment（EPT）on the microstructure of a Ti-based bulk metallic glass（BMG）has been *** maximum current density applied during EPT can exert a crucial role on tuning the microstructure of the *** the maximum current density is no more than 2 720A/mm^2,the samples retains amorphous nature,whereas,beyond that,crystalline phases precipitate from the glassy *** EPT,the maximum temperature within the samples EPTed at the maximum current densities larger than 2 720A/mm^2 is higher than the crystallization temperature of the BMG,leading to the crystallization event.

关键词： bulk metallic glass electropulsing transmission electron microscopy crystallization microstructure

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Linear-quadratic optimal control for time-varying descriptor systems via space decompositions

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The Journal of China Universities of Posts and Telecommunications 2023年第6期30卷 38-48页

作者： LüPengchao huang Junjie Liu bo School of Mathematical Sciences Inner Mongolia UniversityHohhot 010021China Ministry of Education Key Laboratory for Intelligent Analysis and Security Governance of Ethnic Languages Minzu University of ChinaBeijing 100081China

This paper aims at solving the linear-quadratic optimal control problems(LQOCP)for time-varying descriptor systems in a real Hilbert *** using the Moore-Penrose inverse theory and space decomposition technique,the descriptor system can be rewritten as a new differential-algebraic equation(DAE),and then some novel sufficient conditions for the solvability of LQOCP are ***,the methods proposed in this work are simpler and easier to verify and compute,and can solve LQOCP without the range inclusion *** addition,some numerical examples are shown to verify the results obtained.

关键词： linear-quadratic optimal control problem(LQOCP) time-varying descriptor system Moore-Penrose inverse space decomposition

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Antitumor activity of anti-type IV collagenase monoclonal antibody and its lidamycin conjugate against colon carcinoma

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World Journal of Gastroenterology 2005年第29期11卷 4478-4483页

作者： Liang Li Yun-hong huang Yi Li Feng-Qiang Wang bo-Yang Shang Yong-Su Zhen Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100050 China

AIM： Type IV collagenase including MMP-2 and -9 plays an important role in cancer cell invasion and metastasis and is an attractive target for rnAb-directed therapy. The irnrnunoreactivity of rnAb 3G11, a rnAb directed against type Ⅳ collagenase in human colorectal carcinomas, was studied by irnrnuno-histochernical （IHC） staining, rnAb 3G11 was conjugated to an antiturnor antibiotic lidarnycin （LDM）. The antiturnor activity of 3G11-LDM conjugate against colon carcinoma was investigated in mice. METHODS： ELISA, gelatin zyrnography, and Western blot assay were used for the biological characterization of rnAb 3G11. The irnrnunoreactivity of rnAb 3G11 with human colorectal carcinomas was detected by IHC staining. The cytotoxicity of LDM and 3G11-LDM conjugate to human colon carcinoma HT-29 cells was examined by clonogenic assay and MTT assay. The therapeutic effect of conjugate 3G11-LDM was evaluated with colon carcinoma 26 in mice. RESULTS： As shown in ELISA, mAb 3Gll reacted specifically with type IV collagenase, while 3G11-LDM conjugate also recognized specifically its respective antigen. In IHC assay, mAb 3G11 showed positive irnrnunoreactivity in most cases of colorectal carcinoma, and negative irnrnunoreactivity in the adjacent non-malignant tissues. By gelatin zyrnography, the inhibition effect of rnAb 3G11 on the secretion activity of type IV collagenase was proved. In terms of IC50 values in MTT assay, the cytotoxicity of LDM to human colon carcinoma HT-29 cells was 10 000-fold more potent than that of rnitornycin C （MMC） and adriarnycin （ADM）. 3G11- LDM conjugate also displayed extremely potent cytotoxicity to human colon carcinoma HT-29 cells with an IC50 value of 5.6× 10^-19 mol/L. 3G11-LDM conjugate at the doses of 0.05 and 0.1 mg/kg inhibited the growth of colon carcinoma 26 in mice by 70.3 and 81.2%, respectively. CONCLUSION： mAb 3G11 is immunoreactive with human colorectal carcinoma and its conjugate with LDM is highly effective against colon carcinoma i

关键词： Type IV collagenase Monoclonal antibody Lidarnycin Colon carcinoma

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Visualizing light-induced dynamic structural transformations of Au clusters-based photocatalyst via in situ TEM

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Nano Research 2021年第8期14卷 2805-2809页

作者： bo Weng Youhong Jiang hong-Gang Liao Maarten B.J.Roeffaers Feili Lai Haowei huang Zichao Tang State Key Laboratory for Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005China cMACS Department of Microbial and Molecular SystemsKU LeuvenCelestijnenlaan 200F3001 LeuvenBelgium Department of Chemistry KU LeuvenCelestijnenlaan 200F3001 LeuvenBelgium

Ultrasmall gold(Au)clusters have been regarded as one of the prototypes materials for solar energy conversion due to their unique strong molecular-like light absorption ***,the light-induced aggregation of Au clusters into nanoparticles is one of the most important factors that restricts its application in *** Au clusters aggregation has been widely demonstrated,the underlying mechanism for cluster fusion is still unclear due to the lack of experimental ***,we report the direct observation of Au clusters on TiO_(2) nanosheets aggregating when used as visible light photocatalysts for the reduction of *** in situ high-resolution transmission electron microscopy(TEM),the coexistence of two fusion mechanisms of Au clusters on TiO_(2) under ultraviolet-visible(UV-Vis)light irradiation in air is identified,i.e.,the migration and coalescence(MC)and Ostwald ripening(OR).Additionally,the correlation between the photostability of Au clusters and reaction atmospheres has been investigated,among which Au clusters have higher stability in an inert N_(2) atmosphere or vacuum than the oxidizing atmospheres(i.e.,air and O_(2)).These results indicate the inherent stability of Au cluster during photocatalysis,and instability comes from the consuming of ligand *** work not only discloses the underlying mechanism of Au cluster sintering but also provides guidelines for enhancing metal clusters-based photocatalysts stability.

关键词： photocatalysis dynamic structural transformation Au clusters in situ TEM

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