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Environmental friendly synthesis of hierarchical mesoporous platinum nanoparticles templated by fucoidan biopolymer for enhanced hydrogen evolution reaction

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Journal of Materials Science & Technology 2020年第11期42卷 185-190页

作者： Seung man Lim Kyunglee Kang hongje Jang Jung Tae Park Department of Chemical Engineering Konkuk University120 Neungdong-roGwangjin-guSeoul 05029Republic of Korea Department of Chemistry Kwangwoon University20 Cwangwoon-roNowon-guSeoul 01897Republic of Korea

Researching novel hydrogen evolution reaction(hER)catalysts with enhanced electrocatalytic activity,excellent stability,and cost-efficiency is of great significance for the large-scale hydrogen production from industrial electrolysis *** report the preparation of hierarchical mesoporous-Pt nanoparticles(hM-Pt NPs)with coral-like rough surface morphologies using environmental friendly and biocompatible fucoidan(Fu)biopolymer as a surface engineering compound and its application to electrocatalysts for *** designed hM-Pt NPs yields better mass activity of electrocatalysts compared to a commercial Pt/***-Pt NPs showed an overpotential of 33 mV at 10 mA cm-2 for the hER in 0.5 Mh2SO4,which was highly comparable to that of the commercial Pt/C catalysts(29 mV).however,the amount of hM-Pt NPs loaded in glassy carbon electrode(0.033 mg mL-1)was approximately 20 times lower than that of the commercial Pt/C(0.64 mg *** hM-Pt NPs also maintained high catalytic stability with a consistent hER current density after 1000 continuous *** excellent hER performance is attributed to the improved electrochemical surface area,highly porous structure,and good surface wettability of the hM-Pt NPs,which results in enhanced electrocatalytic activity,decreased resistance at the electrode/electrolyte interface,and facile penetration of the electrolytes inside the electrode.

关键词： Mesoporous Fucoidan Biopolymer Low Pt content hydrogen evolution reaction

Analysis and Referential Significance of a Breakdown Accident of the Main Feed Water Pump in a 350 MW Supercritical CFB Boiler

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Journal of Thermal Science 2023年第5期32卷 1797-1806页

作者： DENG Boyu ZhANG man WEI Guohua LyU Junfu yANG hairui State Key Laboratory of Power System and Generation Equipment Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers/harbin Boiler Company Limited Harbin 150046China

Controversies still exist over the necessity of equipping with an emergency water supply system in the supercritical circulating fluidized bed/CFB *** resolve the dispute,research on the safety of the heating surfaces in the supercritical CFB boiler during the electricity failure accident under the assumption of not putting the emergency water supply system into use must be ***,due to the low incidence rate of this accident,no relevant data have been reported *** provide useful data for the related research,a breakdown accident of the main feed water pump that happened in a 350 MW supercritical CFB boiler was introduced in this *** analysis of the physical processes in both the furnace and water side of the boiler during this accident was *** the discussion on the similarities and discrepancies between the two accidents was carried *** was found out that with appropriate handling,the data collected in two periods of the breakdown accident of the main feed water pump can provide a reference for the verification of the prediction model of the electricity failure ***,a preliminary prediction model was established as the first step of the verification work.

关键词： supercritical CFB water supply cut off electricity failure accident analysis

Reaction mechanism of methyl nitrite dissociation during co catalytic coupling to dimethyl oxalate:A density functional theory study

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Chinese Journal of Chemical Engineering 2016年第1期24卷 132-139页

作者： Chen Fan man Luo Wende Xiao Key Laboratory of Advanced Control and Optimization for Chemical Processes Ministry of Education East China University of Science and Technology (ECUST) School of Chemistry and Chemical Engineering Shanghai Jiao Tong University (SJTU)

Dissociation of methyl nitrite is the first step during CO catalytic coupling to dimethyl oxalate followed by hydrogenation to ethyl glycol in a typical coal to liquid process. In this work, the first-principle calculations based on density functional theory were performed to explore the reaction mechanism for the non-catalytic dissociation of methyl nitrite in the gas phase and the catalytic dissociation of methyl nitrite on Pd(111) surface since palladium supported on alpha-alumina is the most effective catalyst for the coupling. For the non-catalytic case, the calculated results show that the Ch_3O–NO bond will break with a bond energy of 1.91 eV, and the produced Ch_3O radicals easily decompose to formaldehyde, while the further dissociation of formaldehyde in the gas phase is difficult due to the strong C–h bond. On the other hand, the catalytic dissociation of methyl nitrite on Pd(111) to the adsorbed Ch_3O and NO takes place with a small energy barrier of 0.03 eV. The calculated activation energies along the proposed reaction pathways indicate that(i) at low coverage, a successive dehydrogenation of the adsorbed Ch_3O to CO and h is favored while(ii) at high coverage, hydrogenation of Ch_3O to methanol and carbonylation of Ch_3O to methyl formate are more preferred. On the basis of the proposed reaction mechanism,two meaningful ways are proposed to suppress the dissociation of methyl nitrate during the CO catalytic coupling to dimethyl oxalate.

关键词： Methyl nitrite Catalytic Non-catalytic Dissociation Density functional theory

Ferroptosis inhibitors reduce celastrol toxicity and preserve its insulin sensitizing effects in insulin resistant hepG2 cells

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Journal of Integrative Medicine 2024年第3期22卷 286-294页

作者： Jia-jia Liu Xue Zhang Bang-lan Cai man-man Qi yong-bin Chi Bin Peng Deng-hai Zhang School of Medicine Shanghai UniversityShanghai 200444China Shanghai health Commission Key Lab of Artificial Intelligence-Based management of Inflammation and Chronic Diseases Shanghai Pudong Gongli HospitalSecondary Military Medical UniversityShanghai 200135China School of Basic Medicine Ningxia Medical UniversityYinchuan 750004Ningxia Hui Autonomous RegionChina

Objective:Research has shown that celastrol can effectively treat a variety of diseases,yet when passing a certain dosage threshold,celastrol becomes toxic,causing complications such as liver and kidney damage and erythrocytopenia,among *** this dichotomy in mind,it is extremely important to find ways to preserve celastrol’s efficacy while reducing or preventing its ***:In this study,insulin-resistant hep G2(IR-hep G2)cells were prepared using palmitic acid and used for in vitro ***-hep G2 cells were treated with celastrol alone or in combination with Nacetylcysteine(NAC)or ferrostatin-1(Fer-1)for 12,24 or 48 h,at a range of *** counting kit-8assay,Western blotting,quantitative reverse transcription-polymerase chain reaction,glucose consumption assessment,and flow cytometry were performed to measure celastrol’s cytotoxicity and whether the cell death was linked to ***:Celastrol treatment increased lipid oxidation and decreased expression of anti-ferroptosis proteins in IR-hep G2 *** downregulated glutathione peroxidase 4(GPX4)m *** docking models predicted that solute carrier family 7 member 11(SLC7A11)and GPX4 were covalently bound by ***,we found for the first time that the application of ferroptosis inhibitors(especially NAC)was able to reduce celastrol’s toxicity while preserving its ability to improve insulin sensitivity in IR-hep G2 ***:One potential mechanism of celastrol’s cytotoxicity is the induction of ferroptosis,which can be alleviated by treatment with ferroptosis *** findings provide a new strategy to block celastrol’s toxicity while preserving its therapeutic effects.

关键词： Celastrol Insulin resistance Ferroptosis N-Acetylcysteine Palmitic acid Molecular docking

Probiotic Bio-Three induces Th1 and anti-inflammatory effects in PBMC and dendritic cells

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World Journal of Gastroenterology 2010年第28期16卷 3529-3540页

作者： man-Chin hua Tzou-yien Lin Chien-Chang Chen Ming-Wei Lai man-Shan Kong hung-Ju Chang Department of Pediatrics Chang Gung Memorial hospital Keelung 204 Taiwan China Graduate Institute of Clinical Medical Sciences College of Medicine Chang Gung University Taoyuan 333 Division of Infectious Disease Division of Gastroenterology Department of Pediatrics Chang Gung Memorial HospitalTaoyuan 333TaiwanChina

AIM:To investigate the immune response of peripheral blood mononuclear cells(PBMCs)and dendritic cells (DCs)that were stimulated by probiotic preparations. METhODS:PBMCs were isolated,cultured,and stimulated with Bio-Three(a mixture of Bacillus mesentericus, Clostridium butyricum and Enterococcus faecalis;105, 10 6 and 10 7 CFU/mL for 24 h).Cytokine production of (1)circulating PBMCs;(2)PBMCs stimulated by probiotic preparation;(3)monocyte-derived DCs;and(4)DC andT cell co-culture was determined by enzyme-linked immunosorbent *** analysis of circulating PBMCs was also investigated by flow *** was obtained from individuals who consumed Bio-Three (10 9 CFU/d ***,*** and ***) for 2 wk,or those who did not take probiotics orally. RESULTS:In culture supernatants,interferon-γ(IFN-γ) and interleukin(IL)-10 production increased,but IL-4 and tumor necrosis factor-α(TNF-α)production by PBMCs decreased after 1 and 2 wk of probiotic *** cytometry was also performed on day 14 and detected enhanced expression of CD11b,hLA-DR, CD4,CD45RA,CD25,CD44 and CD69 in response to ***,IL-10 and IL-12 were upregulated in supernatants of monocyte-derived DCs,and IFN-γand IL-10 were enhanced in supernatants of CD4 + T cells co-cultured with DCs. CONCLUSION:Bio-Three appeared to stimulate the Th1 immune response,downregulate pro-inflammatory cytokines(TNF-α)and upregulate anti-inflammatory cytokine(IL-10).Probiotics could be effective in activation of PBMCs and DCs.

关键词： Probiotics Bio-Three Peripheral blood mono- nuclear cells Dendritic cells

Improved oxidative tolerance in suspension‐cultured cells of C_4-pepctransgenic rice by h_2O_2 and Ca^(2+)under PEG-6000

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Journal of Integrative Plant Biology 2015年第6期57卷 534-549页

作者： Baoyun Qian Xia Li Xiaolong Liu man Wang Institute of Food Crops Jiangsu Academy of Agricultural SciencesJiangsu High Quality Rice Research and Development CenterNanjing BranchChina National Center for Rice Improvement College of Life Sciences Nanjing Agricultural University Provincial Key Laboratory of Agrobiology Jiangsu Academy of Agricultural Sciences

To understand the molecular responses of PC （Overexpressing the maize C4‐pepc gene, which encodes phosphoenolpyruvate carboxylase （PEPC））, to drought stress at cel level, we analyzed changes in the levels of signaling molecules （hydrogen peroxide （h2O2）, calcium ion （Ca2t）, and nitric oxide （NO）） in suspension‐cultured PC and wild‐type （WT） rice （Oryza sativa L.） cel under drought stress induced by 20%polyethylene glycol 6000 （PEG‐6000）. Results demonstrated that PC improved drought tolerance by enhancing antioxidant defense, retaining higher relative water content, survival percentages, and dry weight of cel s. In addition, PEPC activity in PC under PEG treatment was strengthened by addition of h2O2 inhibitor, dimethylthiourea （DMTU） and NO synthesis inhibitor, 2‐（4‐carboxyphenyl‐4,4,5,5‐tetramethylimidazoline‐1‐oxyl‐3‐oxide （cPTIO）, respectively, while that in PC was weakened by addition of free calcium chelator, ethylene glycol‐bis（b‐aminoethylether）‐N,N,N0 ,N0‐tetraacetic acid （EGTA） t calcium channel outflow inhibitor, ruthenium red （RR） t plasma membrane channel blocker La（NO3）3, but EGTA t RR did not. Results also showed that NO and Ca2t was lying downstream of h2O2 in drought‐induced signaling. Calcium ion was also involved in the expression of C4‐pepc in PC. These results suggested that PC could improve oxidative tolerance in suspension‐cultured cel s and the acquisition of this tolerance required downregulation of h2O2 and the entry of extracel ular Ca2t into cel s across the plasma membrane for regulation of PEPC activity and C4‐pepc expression.

关键词： Calcium drought hydrogen peroxide phosphoenolpyruvate carboxylase rice (Oryza sativa L.)

Research on h_2 speed governor for diesel engine of marine power station

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Journal of Marine Science and Application 2007年第3期6卷 51-57页

作者： hUANG man-lei College of Automation Harbin Engineering University Harbin 150001 China

The frequency stability of a marine power system is determined by the dynamic characteristic of the diesel engine speed regulation system in a marine power station. In order to reduce the effect of load disturbances and improve the dynamic precision of a diesel engine speed governor, a controller was designed for a diesel engine speed regulation system using h2 control theory. This transforms the specifications of the system into a standard h2 control problem. Firstly, the mathematical model of a diesel engine speed regulation system using an h2 speed governor is presented. To counter external disturbances and model uncertainty, the design of an h, speed governor rests on the problem of mixed sensitivity. Computer simulation verified that the h2 speed governor improves the dynamic precision of a system and the ability to adapt to load disturbances, thus enhancing the frequency stability of marine power systems.

关键词： marine power station diesel engine speed overnor h control

Synthesis and Crystal Structure of a Novel manganese Coordination Polymer Constructed by 3,5-Dimethylbenzoic Acid with 4,4'-Bipyridine

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Chinese Journal of Structural Chemistry 2006年第10期25卷 1213-1216页

作者： ZhANG Chun-hua ChEN man-Sheng KUANG Dai-Zhi Department of Chemistry and Materials Science Hengyang Normal University Hengyang 421008 China

A novel manganese coordination polymer [Mn（L）2（bipy）]n （hL = 3,5-dimethylbenzoic acid, 4,4＇-bipy = 4,4＇-bipyridine） has been synthesized by a hydrothermal method. The molecular and crystal structures were determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group C2/c with a = 2.0996（8）, b = 1,1835（5）, c = 0.9958（4） nm, β = 110.161（5）°, V = 2,3229（16） nm^3, Z = 4, C28h26MnN2O4, Mr = 509.45, Dc= 1.457 g/cm^3,μ = 0.607 mm^-1, F（000） = 1060, Rim = 0.0566, R = 0.0334 and wR = 0.1078. In the crystal the manganese atom is six-coordinated by two nitrogen atoms from 4,4＇-bipy and four oxygen atoms from 3,5-dimethylbenzolate molecules, completing an octahedral geometry. The 4,4＇-bipy molecules bridge the infinite chain [Mn（L）2（bipy）]n to form a two-dimensional layer.

关键词： manganese coordination polymer hydrothermal synthesis crystal structure

Microwave-assisted hydrothermal synthesis and gas sensitivity of nanostructured SnO_2

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Particuology 2013年第2期11卷 242-248页

作者： Liying man Jun Zhang Jieqiang Wang hongyan Xu Bingqiang Cao School of Materials Science and Engineering University of Jinan

Precursors for nanostructured SnO2 were synthesized via a microwave-assisted hydrothermal method under different conditions, using SnCI2.2h2 O, urea and citric acid as reactants. After calcination of the pre-cursors at 700 ℃ for 2 h, nanostructured SnO2 with different morphologies were obtained, and were then characterized using X-ray powder diffraction （XRD）, and field-emission scanning electron microscopy （FESEM）. The results show that synthesis temperature and time play an important role in the formation of the 3D hierarchical morphology of the nanostructured SnO2. Gas sensing experiments demonstrate that the synthesized SnO2 materials, especially those with a 3D network structure, exhibit superb sensitivity to alcohol vaoors at 240 ℃.

关键词： Microwave-assisted hydrothermal Gas sensitivity hierarchical Self-assemble