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Interaction of photons with sil.er and indium nucl.i at energies up to 20 MeV

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Chinese Physics C 2024年第2期48卷 135-140页

作者： J.H.Khushvaktov M.A.Demichev D.l.demin S.A.Evseev M.I.Gostkin V.V.Kobets F.A.Rasu-l.va S.V.Rozov E.T.Ruziev A.A.Sol.yshkin T.N.Tran E.A.Yakushev B.S.Yul.ashev Joint Institute for Nucl.ar Research(JINR) DubnaRussia Institute of Nucl.ar Physics of the Academy of Sciences of the Republ.c of Uzbekistan(INP ASRU) TashkentUzbekistan Institute of Physics of the Vietnam Academy of Science and Technol.gy(IP VAST) HanoiVietnam

The yiel.s of photonucl.ar reactions in the 107Ag,113In,and 115In nucl.i were *** Carl. simul.tions were performed using the Geant4 code,and the resul.s were compared with the experimental.*** isomeric ratios of the yiel.s in the reactions 107Ag(γ,n)106m,gAg and 113In(γ,m)112m,gIn were determined,and the cross sections for the reactions 107Ag(γ,n)106gAg and 107Ag(γ,2n)105Ag at an energy of 20 MeV were cal.ul.ted based on the experimental.data.

关键词： 107Ag(γ,n)10mgAg and I13In(γ,n)12m-2In reactions cross section yiel. isomeric ratio simul.-tion Geant4 TAl.S

适用于天然气发动机高EGR率的引射器仿真研究

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西南交通大学学报 2024年第2期59卷 467-476页

作者：王晓艳康天钦王培伦贾德民徐煜赵建辉潍柴动力股份有限公司内燃机可靠性国家重点实验室山东潍坊261001 哈尔滨工程大学动力与能源工程学院黑龙江哈尔滨150001

针对发动机抑制爆震的难题,提出采用无功耗的引射器实现天然气发动机高废气再循环(EGR)率的技术方案.首先,完成设计工况下的引射器结构参数设计计算;然后,建立引射器仿真模型,并根据实验数据开展引射器计算模型的校核与验证;其次,对引... 详细信息

针对发动机抑制爆震的难题,提出采用无功耗的引射器实现天然气发动机高废气再循环(EGR)率的技术方案.首先,完成设计工况下的引射器结构参数设计计算;然后,建立引射器仿真模型,并根据实验数据开展引射器计算模型的校核与验证;其次,对引射器引射性能随结构参数的改变进行分析,获取各结构参数对引射性能的影响规律;最后,提出了一种新的结构参数敏感性评价指标,研究了结构参数对引射性能的影响程度.研究结果表明:随着混合段长度和扩压段长度的增加,引射系数(μ)会随之增大;混合段直径(d_(3))、扩压段角度(θ_(s))和喷嘴出口至混合段距离(l.(NXP))的增加会导致μ先增加后减小,μ的最大值分别出现在d_(3)=46.1 mm、θ_(s)=4°和l.(NXP)=57.33 mm处;对μ影响最大的结构参数为d_(3),对应的敏感性指标为0.88,而l.(NXP)对μ的影响程度最小,敏感性指标为0.05.

关键词：引射系数敏感性分析引射器废气再循环天然气发动机

Treatment of Toxic Phenol.c Wastewater by Advanced Ozone Oxidization

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China Petrol.um Processing & Petrochemical.Technol.gy 2010年第3期12卷 59-64页

作者： Yang demin Col.ege of Chemistry and Chemical.Engineering Southwest Petroleum University Chengdu 610500

In this study, the O3/BAC/TiO2 catal.tic method was used to treat the phenol.c wastewater. During the experiments the effects of initial.phenol.concentration, ozone concentration, pH val.e, catal.st and other conditions on the phenol.removal.rate were investigated. The test resul.s showed that when the phenol.concentration was 0.1 g/l. the ozone-containing air fl.w rate was 0.05 m3/b, the ozone concentration was 3.58 mg/l. the pH val.e was 7.5, and the treating time was 30 minutes, the phenol.removal.rate reached 99%, with the COD removal.rate equating to 55%. The property of treated wastewater coul. compl. with the first-grade effl.ent specified in ＂Comprehensive Wastewater Discharge Standard＂（GB8978--1996）.

关键词： phenol.containing wastewater catal.tic oxidation activated carbon nano-TiO2 removal.rate

苏南地区汞污染农田土壤植物套作修复模式的筛选

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农业环境科学学报 2024年第3期43卷 553-563页

作者：焦龙进程剑姜德民朱家辉杨倩徐双圆葛鹏占新华江苏省地质矿产局第三地质大队江苏镇江212021 南京农业大学资源与环境科学学院南京210095

为探究不同作物-超富集植物套作模式对修复汞污染农田土壤的效果,本研究通过盆栽试验,以小麦、大豆、油菜等作物为研究对象,将其分别与野艾蒿、乳浆大戟、悬钩子等汞富集植物搭配套作,研究不同套种体系修复汞污染农田土壤的效果。结果表... 详细信息

为探究不同作物-超富集植物套作模式对修复汞污染农田土壤的效果,本研究通过盆栽试验,以小麦、大豆、油菜等作物为研究对象,将其分别与野艾蒿、乳浆大戟、悬钩子等汞富集植物搭配套作,研究不同套种体系修复汞污染农田土壤的效果。结果表明:与富集植物进行套作时,作物根、茎、叶和籽粒的汞含量有不同程度的下降,其中根部汞含量下降最明显,作物与富集植物套作可以降低作物体内汞含量。与小麦单作相比,野艾蒿、悬钩子与小麦套作可以增加小麦地上部生物量,增加幅度分别为49.37%和42.45%。小麦/野艾蒿套作和小麦/悬钩子套作富集植物中汞的转移系数(Transfer factors,TF)接近,但野艾蒿汞的生物富集系数(Bioconcentration factor,BCF)显著高于悬钩子,是其的2.59倍;大豆的两种套作模式下,乳浆大戟的TF、BCF值皆高于野艾蒿,分别是其的1.41倍和1.50倍;油菜的两种套作模式下,悬钩子和野艾蒿的TF值接近。结果分析显示野艾蒿适合与小麦套作,乳浆大戟适合与大豆套作。综上所述,小麦/野艾蒿、大豆/乳浆大戟套作模式可以降低作物体内汞含量,并在一定程度上提高小麦和大豆产量。

关键词：植物修复套作汞富集植物农田土壤

Effects of soil.amendments, fol.ar sprayings of sil.con and sel.nium and their combinations on the reduction of cadmium accumul.tion in rice

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Pedosphere 2022年第4期32卷 649-659页

作者： demin l. Hongyan l.U Min GAO Jing ZHOU Jun ZHOU Col.ege of Agricul.ure Guizhou UniversityGuiyang 550025China Key l.boratory of Soil.Environment and Pol.ution Remediation Institute of Soil ScienceChinese Academy SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China National.Engineering and Technol.gy Research Center for Red Soil.Improvement Red Soil Ecological Experiment StationChinese Academy of SciencesLiujiazhan PlantationYingtan 335211China

Agricul.ural.soil.contamination by cadmium (Cd) is becoming one of the most serious environmental.issues and publ.c concerns. In this study, factorial.arrangements of treatments were designed to expl.re the effects of two soil.amendments, sodium sul.ide-biofuel.ash (SSBA) and l.me (0.1%), and three fol.ar appl.cations, sil.con (Si, 2.5 mmol.l.1), sel.nium (Se, 40 mg l.1), and their combination (SS), on Cd reduction in rice (Oryza sativa l.) in a pot experiment, which were then verified in a fiel. experiment. Compared with the control.without amendment but with spraying of deionized water, both SSBA and l.me significantl. reduced concentrations of CaCl.-extractabl. Cd in soil.by 30%–39% and 31%–40% and Cd in brown rice by 44%–63% and 53%–72% in the pot and fiel. experiments, respectivel.. Fol.ar Si, Se, and SS appl.cations significantl. reduced Cd accumul.tion in brown rice by 62%–64%, 72%–83%, and 39%–73%, respectivel., increased rice grain yiel., and improved antioxidant enzyme activities in rice l.aves but with different trends in the pot and fiel. experiments. Combinations of SSBA and l.me with Si, Se, and SS had a non-significant synergistic effect on Cd reduction in brown rice compared to onl. fol.ar spraying or soil.amendment in both pot and fiel. experiments, al.hough SSBA + Se and SSBA + Si reduced Cd concentration in brown rice by 16%–34% and 14%–24% compared to onl. fol.ar Si and Se and soil.SSBA appl.cations, respectivel.. Soil.l.me appl.cation and fol.ar Si spraying were the most cost-effective strategies to reduce Cd accumul.tion in brown rice in the fiel. and pot experiments, respectivel.. Al.hough soil.amendments and fol.ar treatments were individual.y effective, their combinations fail.d to generate a significant synergistic reduction of Cd concentration in brown rice.

关键词： antioxidant enzyme activity bioconcentration factor cadmium bioavail.bil.ty rice yiel. soil.contamination synergistic effect transl.cation factor

强化混凝+气浮+臭氧催化氧化+膜分离+MVR蒸发工艺处理气田开发废水

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水处理技术 2024年第9期50卷 148-151页

作者：杨德敏张烨袁建梅廖新睿阚涛涛页岩气勘探开发国家地方联合工程研究中心(重庆地质矿产研究院) 重庆401120 自然资源部页岩气资源勘查重点实验室(重庆地质矿产研究院) 重庆401120 重庆华地资环科技有限公司重庆401120 中国海洋大学环境科学与工程学院山东青岛266100 中海油能源发展股份有限公司工程技术分公司天津300451

针对气田开发废水组分复杂、有机污染物浓度高、盐度高、色度高、可生化性差等特点,采用强化混凝+气浮分离+臭氧催化氧化+膜分离+MVR蒸发工艺对气田开发废水进行处理。运行结果表明,该组合工艺对气田开发废水降解性能良好,处理效率高,... 详细信息

针对气田开发废水组分复杂、有机污染物浓度高、盐度高、色度高、可生化性差等特点,采用强化混凝+气浮分离+臭氧催化氧化+膜分离+MVR蒸发工艺对气田开发废水进行处理。运行结果表明,该组合工艺对气田开发废水降解性能良好,处理效率高,运行稳定,处理出水COD、氯离子、SS、氨氮、石油类分别为20.5、10.8、9.0、1.5、0.7 mg/l.总去除率分别达到99.77%、99.94%、99.68%、98.73%、99.75%,各项水质指标均优于《污水综合排放标准》(GB 8978-1996)一级排放标准要求(其中氯离子质量浓度优于《四川省水污染物排放标准》(DB 51/190-93)一级标准)。

关键词：气田开发废水强化混凝臭氧催化氧化超滤反渗透 MVR

Enhancing the thermostabil.ty of D-al.ul.se 3-epimerase from Cl.stridium cel.ul.l.ticum H10 via directed evol.tion

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Systems Microbiol.gy and Biomanufacturing 2022年第4期2卷 685-694页

作者： Shuhan l.u Yifan Wang demin Kong Jing Wu Zhanzhi l.u State Key l.boratory of Food Science and Technol.gy Jiangnan University1800 Lihu AvenueWuxi 214122Jiangsu ProvinceChina School.of Biotechnol.gy and Key l.boratory of Industrial.Biotechnol.gy Ministry of Education Jiangnan University1800 Lihu AvenueWuxi 214122Jiangsu ProvinceChina International.Joint l.boratory On Food Safety Jiangnan University1800 Lihu AvenueWuxi 214122Jiangsu ProvinceChina

d-al.ul.se,the epimer at C-3 position of d-fructose,is a l.w-cal.rie functional.rare sugar,which is regarded as one of the most potential.*** present,the main production method of d-al.ul.se is epimerization of d-fructose by d-al.ul.se 3-epimerase(DAE).However,industrial.appl.cations of DAE are stil. l.mited by its poor ***,directed evol.tion was appl.ed to improve the thermostabil.ty of dAE from Cl.stridium cel.ul.l.ticum H10(CcDAE).Two optimal.mutants D281G and C289R,exhibiting 13.80-fol. and 13.88-fol. t_(1/2 )val.es as that of wil. type at 65℃,respectivel.,were *** further enhance the thermostabil.ty,the tripl. mutant A107P/D281G/C289R was constructed after combina-tion of mutants D281G,C289R,and previousl. identified thermostabil.ty-enhanced mutant *** T_(m) and optimal.temperature of tripl. mutant were increased by 14.39℃and 5℃,respectivel.,compared to the wil. type,meanwhil.,the hal.-l.fe of tripl. mutant was 58.85-fol. as that of wil. type at 65℃.Furthermore,the conversion rate of tripl. mutant was increased from 24.76%of wil. type to 27.53%using 300 g/l.d-fructose as substrate at 70℃.The effectiveness of directed evol.tion was verified and the tripl. mutant with enhanced thermostabil.ty had great appl.cation val.e in the l.rge-scal. production of d-al.ul.se.

关键词： D-al.ul.se 3-epimerase Directed evol.tion Ul.ra-high throughput screening Thermostabil.ty

Design, Synthesis and Biol.gical.Eval.ation of Pentacycl.c Triterpene Dimers as HCV Entry Inhibitors

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Chinese Journal.of Chemistry 2017年第8期35卷 1322-1328页

作者： l.ngkuan Meng Qi Wang Tao Tang Sul.ng Xiao l.he Zhang demin Zhou Fei Yu Medical.Facul.y of Kunming University of Science and Technol.gy Kunming Yunnan 650500 China State Key l.boratory of Natural.and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Beijing 100191 China

A series of triterpene dimers bearing different scaffol. were designed and synthesized via CuAAC reaction. Their anti-HCV entry activities were eval.ated by HCVpp and VSVpp entry assays. It was found that echinocystic acid （EA） and its dimer were stil. necessary for maintaining anti-HCV entry activity, and repl.cement of EA by other triterpenes might significantl. decrease its anti-viral.activities. Using a l.nker bearing a piperazine group, compound 14 dramatical.y increased its potency with IC50 at 2.87 nmol.l. In addition, the undesired hemol.tic effect of al. these compounds was removed.

关键词： pentacycl.c triterpene echinocystic acid dimer HCV entry inhibitor

Sodium butyrate al.eviates deoxynival.nol.induced hepatic chol.sterol.metabol.c dysfunction via RORγ-mediated histone acetyl.tion modification in weaning pigl.ts

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Journal.of Animal.Science and Biotechnol.gy 2023年第2期14卷 792-805页

作者： Qiufang Zong Huan Qu Yahui Zhao Haoyu l.u Shengl.ng Wu Shuai Wang Wenbin Bao demin Cai Col.ege of Animal.Science and Technol.gy Yangzhou UniversityYangzhou 225009PR China Joint International.Research l.boratory of Agricul.ure&Agri‑Product Safety Yangzhou UniversityYangzhou 225009PR China Department of Animal.Nutrition and Feed Science College of Animal Science and TechnologyHuazhong Agricultural UniversityWuhan 430070PR China.

Background:Chol.sterol.is an essential.component of l.pid rafts in cel. pl.sma membrane,which exerts a hepatoprotective rol. against mycotoxin exposure in pigs,and chol.sterol.metabol.sm is vul.erabl. to epigenetic histone ***,our present study aimed to investigate whether a histone deacetyl.se inhibitor(sodium butyrate [NaBu]) coul. protect the porcine l.ver from deoxynival.nol.DON) exposure by modul.ting chol.sterol.***,we randoml. divided 28 pigs into four groups,which were fed an uncontaminated basal.diet,contaminated diet(4 mg DON/kg),uncontaminated diet suppl.mented with 0.2% NaBu or 4 mg/kg DON contaminated diet(4 mg DON/kg) suppl.mented with 0.2% NaBu for 28 ***:We found that the serum al.nine transaminase(Al.),aspartate transaminase(AST),and al.al.ne phosphatase(Al.) were al. increased in pigs exposed to DON,indicative of significant l.ver ***,the chol.sterol.content in the serum of DON-exposed pigs was significantl. reduced,compared to the heal.hy Vehicl. *** anal.sis of porcine l.ver tissues reveal.d that the chol.sterol.homeostasis pathway was highl. enriched due to DON *** which we val.dated by qRT-PCR and western bl.tting that the chol.sterol.program was markedl. ***,NaBu effectivel. restored parameters associated with l.ver injury,al.ng with the chol.sterol.content and the expression of key genes invol.ed in the chol.sterol.biosynthesis ***,we performed a ChIP-seq anal.sis of H3K27ac and showed that NaBu strongl. diminished DON-increased H3K27ac genome-wide *** further val.dated that the el.vated H3K27ac and H3K9ac occupancies on chol.sterol.biosynthesis genes were both decreased by NaBu,as determined by ChIP-qPCR ***,nucl.ar receptor RORγ,a novel.regul.tor of chol.sterol.biosynthesis,was found in the hyperacetyl.ted ***,a remarkabl. increase of RORγ at both mRNA and protein l.vel. in DON-exposed porcine l

关键词： Chol.sterol.biosynthesis DON Histone acetyl.tion RORγ Sodium butyrate