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耐低温酵母的分离鉴定及对低温酿造米酒品质的影响

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食品工业科技 2024年第7期45卷 159-166页

作者：廖娟李嘉宇黄杰惠陈博慧杨涛中南林业科技大学食品科学与工程学院湖南长沙410004 稻谷及副产品国家工程研究中心湖南长沙410004

为筛选适合低温酿造米酒的酵母菌株,本研究从米曲中分离纯化、筛选出低温下产香舒适、发酵能力优良、产酒精能力和产酯能力强的酵母,通过形态观察及分子生物学方法对其进行菌种鉴定,分析其生长情况和耐受性,并将其应用于低温酿造米酒。... 详细信息

为筛选适合低温酿造米酒的酵母菌株,本研究从米曲中分离纯化、筛选出低温下产香舒适、发酵能力优良、产酒精能力和产酯能力强的酵母,通过形态观察及分子生物学方法对其进行菌种鉴定,分析其生长情况和耐受性,并将其应用于低温酿造米酒。结果表明,分离、筛选得到一株耐低温酵母菌株XQ2-8,经鉴定为酿酒酵母(Saccharomyces cerevisiae)。与对照菌株相比,菌株XQ2-8在15℃下生长曲线的延滞期变短、达到稳定期时的生物量更高,具有较好的耐低温特性。菌株XQ2-8对生长环境具有一定的耐受性,可在乙醇体积分数8%vol、葡萄糖含量60%、pH3.0、低温10℃条件下正常生长。利用菌株XQ2-8酿造米酒,与常温酿造相比,低温米酒的总酯含量(60.08 mg/L)和甘油含量(2.59 g/L)分别提高了15.6%、22.7%;总酸含量(1.91 g/L)和总高级醇含量(578.20 mg/L)分别降低了18.0%、17.7%;感官得分(89.47)提高了11.7%。说明利用筛选得到的菌株XQ2-8低温酿造可以改善米酒中酯类含量低、高级醇含量偏高的问题,提高米酒品质。

关键词：米酒酵母菌分离鉴定生长特性低温发酵

Smoothness on Bubble Tree Compactified Instanton Moduli Spaces

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Acta Mathematica Sinica,English Series 2010年第2期26卷 209-240页

作者： bohui chen Department of Mathematics and Yangtze Mathematical Center Sichuan University Chengdu 610064 P. R. China

The bubble tree compactified instanton moduli space -Mκ （X） is introduced. Its singularity set Singκ（X） is described. By the standard gluing theory, one can show that- Mκ（X） - Singκ（X） is a topological orb... 详细信息

关键词： instanton bubble tree compactification smoothness

Virtual Manifolds and Localization

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Acta Mathematica Sinica,English Series 2010年第1期26卷 1-24页

作者： bohui chen Gang TIAN Department of Mathematics and Yangtze Mathematical Center Sichuan University Chengdu 610064 P. R. China Department of Mathematics Peking University Beijing 100084 P. R. China Department of Mathematics Princeton University Princeton New Jersey 08544-1000 USA

In this paper, we explore the virtual technique that is very useful in studying the moduli problem from a differential geometric point of view. We introduce a class of new objects ＂virtual manifolds/orbifolds＇, on w... 详细信息

关键词： virtual manifolds localization Fredholm system moduli space

Orbifold Gromov-Witten theory of weighted blowups

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Science China Mathematics 2020年第12期63卷 2475-2522页

作者： bohui chen cheng-Yong Du Rui Wang Department of Mathematics and Yangtze Center of Mathematics Sichuan UniversityChengdu 610064China School of Mathematical Sciences and V.C.&V.R.Key Lab Sichuan Normal UniversityChengdu 610068China Department of Mathematics University of CaliforniaBerkeleyBerkeleyCA 94720USA

Consider a compact symplectic sub-orbifold groupoid S of a compact symplectic orbifold groupoid(X,ω).LetXabe the weight-a blowup of X along S,and Da=PNa be the exceptional divisor,where N is the normal bundle of S in *** this paper we show that the absolute orbifold Gromov-Witten theory ofXacan be effectively and uniquely reconstructed from the absolute orbifold Gromov-Witten theories of X,S and Da,the natural restriction homomorphism HCR^*(X)→HCR*(S)and the first Chern class of the tautological line bundle over *** achieve this we first prove similar results for the relative orbifold Gromov-Witten theories of(Xa|Da)and(Na|Da).As applications of these results,we prove an orbifold version of a conjecture of Maulik and Pandharipande(Topology,2006)on the Gromov-Witten theory of blowups along complete intersections,a conjecture on the Gromov-Witten theory of root constructions and a conjecture on the Leray-Hirsch result for the orbifold Gromov-Witten theory of Tseng and You(J Pure Appl Algebra,2016).

关键词： orbifold Gromov-Witten theory Leray-Hirsch result weighted projective bundle weighted blowup root stack blowup along complete intersection

Ruan's conjecture on singular symplectic flops of mixed type

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Science China Mathematics 2014年第6期57卷 1121-1148页

作者： chen bohui LI AnMin LI XiaoBin ZHAO GuoSong Yangtze Center of Mathematics Department of MathematicsSichuan University Department of Mathematics Southwest Jiaotong University Department of Mathematics Sichuan University

In this paper,we study the global singular symplectic flops related to the following affine hypersurface with cyclic quotient singularities,Vr,b={(x,y,z,t)∈C4|xy-z2r+t2=0}/μr(a,-a,b,0),r 2,where b=1 appears in Mori’s minimal model program and b=1 is a new class of singularities in symplectic birational *** prove that two symplectic 3-orbifolds which are singular flops to each other have isomorphic Ruan cohomology *** proof is based on the symplectic cutting argument and virtual localization technique.

关键词： Ruan's conjecture singular symplectic flops (r b)-orbiconifold singularity Ruan cohomology virtual localization

Rheological study of methane gas hydrates in the presence of micron-sized sand particles

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Chinese Journal of Chemical Engineering 2024年第6期70卷 149-161页

作者： bohui Shi Shangfei Song Yuchuan chen Shunkang Fu Lihao Liu Xinyao Yang Haihao Wu Guangjin chen Jing Gong National Engineering Research Center of Oil and Gas Pipeline Transportation Safety MOE Key Laboratory of Petroleum EngineeringBeijing Key Laboratory of Urban Oil and Gas Distribution TechnologyChina University of Petroleum-BeijingBeijing 102249China China's Oil and Gas Exploration and Development Company(CNODC) Beijing 100034China China National Petroleum Corporation Mozambique LDA MaputoMozambique PipeChina West East Pipeline Company Shanghai 200122China

Natural gas hydrates,intricate crystalline structures formed by water molecules and small gas molecules,have emerged as a significant and globally impactful clean energy ***,their commercial exploitation faces challenges,particularly operational disruptions caused by sand-related *** the rheological properties of hydrate slurry,especially in the presence of micron-sized sand particles,is imperative for ensuring the flow assurance of subsea hydrate *** study extensively investigates the rheological properties of sand-containing hydrate *** findings reveal that these slurries exhibit non-Newtonian fluid characteristics,including yield stress,thixotropy,and shear-thinning ***-like elastic features are observed in sand-containing hydrate slurries before yielding,transitioning to viscous behavior after *** with a minimal amount of sand,both static yield stress and yield strain experience substantial changes,correlating with the increase in sand *** research conclusively establishes the thixotropic nature of sand-hydrate slurries,where the viscosity decay rate is directly influenced by the shear *** insights aim to contribute comprehensively to the development of effective flow assurance strategies,ensuring the safe and stable operation of subsea hydrate exploitation.

关键词： Natural gas hydrate production Sand-containing hydrate slurries Yield stress Thixotropy Shear-thinning behavior

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基于HMM的煤矿底板突水短时预测模型

安全与环境工程 2020年第5期27卷 190-196页

作者：杨坤陈伯辉施式亮福州大学环境与资源学院福建福州350108 湖南科技大学资源环境与安全工程学院湖南湘潭411201

为解决煤矿底板突水预测在实际应用中工作量大、数据不足等问题,结合突水系数法及其衍生方法,对其进行以突水系数阈值回归分析处理为主的方法改进,并基于隐马尔科夫模型分别构建以单位涌水量为观测对象的突水系数阈值预测模型和实际突... 详细信息

为解决煤矿底板突水预测在实际应用中工作量大、数据不足等问题,结合突水系数法及其衍生方法,对其进行以突水系数阈值回归分析处理为主的方法改进,并基于隐马尔科夫模型分别构建以单位涌水量为观测对象的突水系数阈值预测模型和实际突水系数预测模型。结合两种模型,通过应用基于条件概率的相关算法,实现了基于单位涌水量的煤矿底板突水短时预测,该模型可用于煤矿底板突水预警工作中监测数据有限条件下的模糊预警。

关键词：煤矿底板突水突水系数阈值单位涌水量隐马尔科夫模型短时预测

Analysis and Measure of Human Factors on Traffic Accidents

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Analysis and Measure of Human Factors on Traffic Accidents

2004安全科学与技术国际会议

作者： SHEN Feimin LEI Jing & chen bohui (College of Environment and Resources Fuzhou University Fuzhou 350002 Fujian China)

The article analyses the human factors of traffic accidents in traffic accidents by expounding the interactions of people, vehicle, road, environment. A critical cause—human factors is brought up by c

关键词： traffic safety human factors catastrophe model measures

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典型内装修材料烟密度的实验研究

福建工程学院学报 2011年第6期9卷 531-534页

作者：陈伯辉福州大学环境与资源学院福建福州350108

采用JCY-1型建材烟密度测试仪,对木材、PP-R和PVC等典型室内装饰材料的烟密度及其浸水前后材料的发烟性能进行了测试分析与研究,得到3种材料的烟密度等级,并对烟气的产生进行了量化,通过计算得到了材料的烟气质量浓度和烟气光学密度。最... 详细信息

采用JCY-1型建材烟密度测试仪,对木材、PP-R和PVC等典型室内装饰材料的烟密度及其浸水前后材料的发烟性能进行了测试分析与研究,得到3种材料的烟密度等级,并对烟气的产生进行了量化,通过计算得到了材料的烟气质量浓度和烟气光学密度。最后,根据研究结果,对消防设计提出了相关建议。

关键词：内装修材料烟密度发烟性能实验研究