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多菌种混合制备高效酱油曲条件研究

中国酿造 2011年第4期30卷 81-83页

作者：方春玉周健吴华昌赵兴秀李晓霞谢继州梁红梅四川理工学院生物工程学院四川自贡643000

以红曲霉、黑曲霉、米曲霉为菌种,采用固态发酵法来制备高效酱油酿造曲,以成曲中蛋白酶活为指标,考察了单菌种制曲工艺和多菌种组合制曲工艺的影响因素如培养时间、培养温度、润水量和无机盐等对蛋白酶活力的影响,并优化了多菌种混合制... 详细信息

以红曲霉、黑曲霉、米曲霉为菌种,采用固态发酵法来制备高效酱油酿造曲,以成曲中蛋白酶活为指标,考察了单菌种制曲工艺和多菌种组合制曲工艺的影响因素如培养时间、培养温度、润水量和无机盐等对蛋白酶活力的影响,并优化了多菌种混合制曲的条件。实验结果表明,多菌种制曲所得曲块质量比单菌种制曲的质量好。当红曲霉、黑曲霉和米曲霉混合制曲时,所得的曲块中蛋白酶酶活为633.42U/g,此曲块制备的优化条件是:培养时间为72h,培养温度为32℃,原料加水量为120%,硫酸锰添加量为0.05%,硫酸锌添加量为0.3%。

关键词：酱油曲多菌种制曲蛋白酶活力条件优化

裂隙分布及井间距对增强型地热系统采热性能的影响

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地球物理学进展 2024年第3期39卷 975-989页

作者：王丹丹党志伟石哲伟方惠明苏杰刘春宇霍超中国煤炭地质总局勘查研究总院北京100039 中国地质大学(北京) 北京100083 中国自然资源航空物探遥感中心北京100083 河南理工大学焦作454003 中煤地质集团有限公司北京100040

中高温岩热型储层开采属于增强型地热系统,开采方式主要通过回注井、生产井、裂隙储层来实现,井间距的布设和裂隙参数将直接影响到流体的流动路径,进而影响着回灌量和换热效率,由此我们考虑通过对裂隙参数与井间距的组合变化对采热性能... 详细信息

中高温岩热型储层开采属于增强型地热系统,开采方式主要通过回注井、生产井、裂隙储层来实现,井间距的布设和裂隙参数将直接影响到流体的流动路径,进而影响着回灌量和换热效率,由此我们考虑通过对裂隙参数与井间距的组合变化对采热性能影响的研究,优选出对生产最有利的裂隙分布与井间距组合参数,为人工造储提供裂隙网络目标,为布井设计提供井间距参考.本次研究采用TOUGH2软件在建立水热力多场耦合模型的基础上,在储层设置了16组不同的裂隙参数组合,进行了48组试验模拟,分析了200 m、300 m、500 m井间距条件下运行30年不同裂隙参数组合对采热性能的影响,结果显示储层和采热温度受井间距影响较大,储层压力受裂隙参数影响较大.不同裂隙参数组合条件下,200 m井间距开采30年生产井温度由初始的81℃下降到47℃左右,300 m井间距开采30年生产井温度下降到55℃左右,500 m井间距开采30年生产井温度下降到67℃左右.不同裂隙参数条件下储层压力相差较大,最大由初始的24 MPa上升到98 MPa,最小上升到28 MPa.根据模拟结果我们得到80 m厚储层最佳压裂开采参数组合为井间距500 m、裂隙开度0.8e^(-4)~0.9e^(-4)m、裂隙条数在10~15条之间、裂隙间距10 m时为最佳开采方案.该研究结果可应用于增强型地热系统(EGS-Enhanced Geothermal Systems)开发中,为高效压裂开采中高温低渗储层提供指导,提高采热效率的同时延长系统使用寿命.

关键词：中深层增强型地热系统采热性能裂隙参数井间距数值模拟回注压力

New design concept for stableα-silicon nitride based on the initial oxidation evolution at the atomic and molecular levels

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Journal of Materials Science & Technology 2022年第27期122卷 156-164页

作者： chunyu Guo Enhui Wang Zhi fang Yapeng Zheng Tao Yang Zhijun He Xinmei Hou Beijing Advanced Innovation Center for Materials Genome Engineering Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China

As the dominated composition of Si_(3)N_(4)ceramics,α-silicon nitride(α-Si_(3)N_(4))can satisfy the strength and fracture toughness demand in the ***,α-Si_(3)N_(4)is oxygen-sensitive at high temperatures,which limits its high-temperature *** improve the oxidation resistance ofα-Si_(3)N_(4)ceramics,it is necessary to shed light on the oxidation ***,the initial oxidation ofα-Si_(3)N_(4)was systematically studied at the atomic and molecular *** density functional theory(DFT)calculation denotes that the(001)surface ofα-Si_(3)N_(4)has the best stability at both room temperature and high ***,the oxidation process of theα-Si_(3)N_(4)(001)surface consists of O adsorption and N desorption,and the consequent formation of nitrogen-vacancy(VN)is the key step for further ***,the molecular dynamics(MD)simulation indicates that the oxidation rate ofα-Si_(3)N_(4)(100)surface is slower than that ofα-Si_(3)N_(4)(001)surface due to the lower N concentration at the outermost ***,the oxidation resistance ofα-Si_(3)N_(4)can be improved by regulating the(100)surface as the dominant exposure *** addition,reducing the concentration of N on the final exposed surface ofα-Si_(3)N_(4)by mean of constructing the homojunction of the Si-terminal(100)surface and other N-containing surfaces(such as(001)surface)should be also a feasible approach.

关键词： α-Si_(3)N_(4) Surface oxidation Nitrogen vacancy DFT MD

The Coordinated Influence of Indian Ocean Sea Surface Temperature and Arctic Sea Ice on Anomalous Northeast China Cold Vortex Activities with Different Paths during Late Summer

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Advances in Atmospheric Sciences 2023年第1期40卷 62-77页

作者： Yitong LIN Yihe fang chunyu ZHAO Zhiqiang GONG Siqi YANG Yiqiu YU Regional Climate Center of Shenyang Liaoning Provincial Meteorological AdministrationShenyang 110016China Key Opening Laboratory for Northeast China Cold Vortex Research China Meteorological AdministrationShenyang 110016China College of Physics and Electronic Engineering Changshu Institute of TechnologyChangshu 215500China Laboratory for Climate Studies National Climate Research CenterChina Meteorological AdministrationBeijing 100081China Inner Mongolia Climate Center Hohhot 010051China

The Northeast China cold vortex(NCCV)during late summer(from July to August)is identified and classified into three types in terms of its movement path using machine *** relationships of the three types of NCCV intensity with atmospheric circulations in late summer,the sea surface temperature(SST),and Arctic sea ice concentration(SIC)in the preceding months,are *** sensitivity tests by the Community Atmosphere Model version 5.3(CAM5.3)are used to verify the statistical *** results show that the coordination pattern of East Asia-Pacific(EAP)and Lake Baikal high pressure forced by SST anomalies in the North Indian Ocean dipole mode(NIOD)during the preceding April and SIC anomalies in the Nansen Basin during the preceding June results in an intensity anomaly for the first type of *** the pattern of high pressure over the Urals and Okhotsk Sea and low pressure over Lake Baikal during late summer-which is forced by SST anomalies in the South Indian Ocean dipole mode(SIOD)in the preceding June and SIC anomalies in the Barents Sea in the preceding April-causes the intensity anomaly of the second *** third type is atypical and is not analyzed in *** tests,jointly forced by the SST and SIC in the preceding period,can well reproduce the *** contrast,the results forced separately by the SST and SIC are poor,indicating that the NCCV during late summer is likely influenced by the coordinated effects of both SST and SIC in the preceding months.

关键词： machine learning method Northeast China cold vortex path classification Indian Ocean sea surface temperature Arctic sea ice model sensitivity test

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隧道内障碍物对爆破冲击波传播特性影响研究

铁道标准设计 2024年第5期68卷 147-152页

作者：罗春雨廖杭李梦可罗虎王宇博方晓峰四川公路桥梁建设集团有限公司公路隧道分公司成都610200 西南交通大学成都610031 广东交通实业投资有限公司广州510623

隧道掌子面开挖爆破产生的冲击波对施工安全构成极大威胁,为研究隧道内障碍物对掌子面开挖爆破产生的冲击波传播特性影响,依托宁攀高速公路胜利隧道,采用动力分析软件ANSYS/LS-DYNA模拟爆破冲击波在隧道内障碍物段的传播,并采用现场测... 详细信息

隧道掌子面开挖爆破产生的冲击波对施工安全构成极大威胁,为研究隧道内障碍物对掌子面开挖爆破产生的冲击波传播特性影响,依托宁攀高速公路胜利隧道,采用动力分析软件ANSYS/LS-DYNA模拟爆破冲击波在隧道内障碍物段的传播,并采用现场测试方法对数值模拟结果进行验证。研究表明:正常衰减的冲击波传播至障碍物面上方2 m处超压迅速增长4.1%,通过障碍物后由于绕流作用超压增长2.2%,障碍物上方冲击波总体呈现增强-衰减-再增强-再减小的特性;障碍物中心轴线前5 m处反射冲击波超压开始高于初始冲击波,反射冲击波传播至障碍物面时超压峰值增长至初始冲击波的2.4倍;障碍物对正后方0.5 m范围内超压峰值有一定的降低作用,0.5~2 m范围内冲击波超压有所增长,随后恢复为正常超压衰减。现场测试结果表明,障碍物前2.5 m处形成2个超压峰值,经障碍物表面反射第2个冲击波超压峰值为初始峰值的2.95倍。

关键词：公路隧道冲击波障碍物数值模拟传播特性现场测试

健康教育临床护理路径应用于糖尿病临床护理中的作用及减少并发症发生率

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糖尿病新世界 2021年第15期24卷 162-166页

作者：方春玉南平市第一医院内分泌科福建南平353000

目的分析健康教育临床护理路径应用于糖尿病临床护理中的效果及对减少并发症发生率的作用。方法选取2019年7-12月该院收治的47例糖尿病患者作为对照组,选取2020年1-6月该院收治的47例糖尿病患者作为研究组,对照组安排开展常规护理,研究... 详细信息

目的分析健康教育临床护理路径应用于糖尿病临床护理中的效果及对减少并发症发生率的作用。方法选取2019年7-12月该院收治的47例糖尿病患者作为对照组,选取2020年1-6月该院收治的47例糖尿病患者作为研究组,对照组安排开展常规护理,研究组在常规护理基础上应用健康教育临床护理路径表进行护理,比较其护理前后的自护能力、血糖水平以及生活质量,同时观察其护理后的护理依从性及并发症率。结果自护能力、血糖水平以及生活质量:护理前,组间各维度ESCA自护能力评分、血糖水平(包括空腹血糖、餐后2 h血糖及糖化血红蛋白)以及各维度生活质量评分比较,差异无统计学意义(P>0.05);护理后,研究组各维度ESCA自护能力评分以及各维度生活质量评分均高于对照组,血糖水平均低于对照组,差异有统计学意义(P<0.05)。护理依从性及并发症率:护理后,研究组护理依从率高于对照组,并发症发生率低于对照组,差异有统计学意义(P<0.05)。结论在糖尿病临床护理中,健康教育临床护理路径的应用不仅可以进一步提高其自护能力及护理依从性,改善血糖水平以及生活生活质量,而且还可以有效减少各种糖尿病相关并发症的发生。

关键词：糖尿病健康教育临床护理路径自护能力护理依从性血糖水平并发症生活质量

酱香型白酒窖醅中耐高温产香酵母的筛选及性能研究

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中国酿造 2020年第11期39卷 43-47页

作者：吕枫赵兴秀李仕鲁刘苑皓何义国方春玉邹伟赵长青艾小满四川轻化工大学生物工程学院四川宜宾644000

通过富集培养、乙醇耐受性测定从浓香型白酒窖醅中筛选耐高温产香酵母菌,通过形态观察、生理生化试验及26S rDNA序列分析对其进行鉴定,测定其乙醇耐受性、产乙醇能力,并通过顶空固相微萃取(HS-SPME)和气质联用(GC-MS)测定其固态发酵产... 详细信息

通过富集培养、乙醇耐受性测定从浓香型白酒窖醅中筛选耐高温产香酵母菌,通过形态观察、生理生化试验及26S rDNA序列分析对其进行鉴定,测定其乙醇耐受性、产乙醇能力,并通过顶空固相微萃取(HS-SPME)和气质联用(GC-MS)测定其固态发酵产香性能。结果表明,筛选得到3株能在45℃高温下生长的酵母菌(Y2、Y12、Y27),其中菌株Y12被鉴定为库得毕赤酵母(Pichia kudriavevii),其耐乙醇能力最高达到6%vol,在40℃条件下产乙醇能力较好,酒精度为6.3%vol。从菌株Y12固态发酵产物中共检测到12种挥发性物质,包括酯类、醇类、酸类和酚类,相对含量分别为72.45%、10.02%、0.40%和0.22%,其中,乙酸乙酯相对含量最高为39.04%。菌株Y12是一株耐高温和产香性能较好的酵母菌株,在白酒工业中有良好的应用前景。

关键词：酱香型白酒窖醅酵母耐高温产香筛选鉴定性能

Effect of pressure on gasification reactivity of three Chinese coals with different ranks

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Frontiers of Chemical Science and Engineering 2010年第4期4卷 385-393页

作者： chunyu LI Jiantao ZHAO Yitian fang Yang WANG Institute of Coal Chemistry Chinese Academy of SciencesTaiyuan 030001China Graduate School of Chinese Academy of Sciences Beijing 100039China

The gasification reactivities of three kinds of different coal ranks(Huolinhe lignite,Shenmu bituminous coal,and Jincheng anthracite)with CO_(2) and H_(2)O was carried out on a self-made pressurized fixed-bed reactor at increased pressures(up to 1.0 MPa).The physicochemical characteristics of the chars at various levels of carbon conversion were studied via scanning electron microscopy(SEM),X-ray diffraction(XRD),and BET surface *** show that the char gasification reactivity increases with increasing partial *** gasification reaction is controlled by pore diffusion,the rate decreases with increasing total system pressure,and under chemical kinetic control there is no pressure *** general,gasification rates decrease for coals of progressively higher *** experimental results could be well described by the shrinking core model for three chars during steam and CO_(2) *** values of reaction order n with steam were 0.49,0.46,0.43,***,the values of reaction order n with CO_(2) were 0.31,0.28,0.26,*** the coal rank increasing,the pressure order m is higher,the activation energies increase slightly with steam,and the activation energy with CO_(2) increases *** the carbon conversion increases,the degree of graphitization is *** surface area of the gasified char increases rapidly with the progress of gasification and peaks at about 40%of char gasification.

关键词： coal gasification pressure reaction order shrinking core model

Maximizing the mechanical performance of Ti_(3)AlC_(2)-based MAX phases with aid of machine learning

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Journal of Advanced Ceramics 2022年第8期11卷 1307-1318页

作者： Xingjun DUAN Zhi fang Tao YANG chunyu GUO Zhongkang HAN Debalaya SARKER Xinmei HOU Enhui WANG Beijing Advanced Innovation Center for Materials Genome Engineering Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6Berlin 14195Germany UGC-DAE Consortium for Scientific Research University CampusKhandwa RoadIndore 452001India

Mechanical properties consisting of the bulk modulus,shear modulus,Young’s modulus,Poisson’s ratio,etc.,are key factors in determining the practical applications of MAX *** mechanical properties are mainly dependent on the strength of M–X and M–A *** this study,a novel strategy based on the crystal graph convolution neural network(CGCNN)model has been successfully employed to tune these mechanical properties of Ti_(3)AlC_(2)-based MAX phases via the A-site substitution(Ti_(3)(Al1-xAx)C_(2)).The structure–property correlation between the A-site substitution and mechanical properties of Ti_(3)(Al1-xAx)C_(2)is *** results show that the thermodynamic stability of Ti_(3)(Al1-xAx)C_(2)is enhanced with substitutions A=Ga,Si,Sn,Ge,Te,As,or *** stiffness of Ti_(3)AlC_(2)increases with the substitution concentration of Si or As increasing,and the higher thermal shock resistance is closely associated with the substitution of Sn or *** addition,the plasticity of Ti_(3)AlC_(2)can be greatly improved when As,Sn,or Ge is used as a *** findings and understandings demonstrated herein can provide universal guidance for the individual synthesis of high-performance MAX phases for various applications.

关键词： Ti_(3)(Al1−xAx)C_(2) crystal graph convolution neural network(CGCNN)model stability mechanical properties