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Experimental Study on Ammonia Co-Firing with Coal for Carbon Reduction in the Boiler of a 300-MW Coal-Fired Power Station

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Engineering 2024年第9期40卷 247-259页

作者： Qifu Lin Wangping Sun Haiyan Li Yangjiong Liu Yuwei Chen Chengzhou Liu Yiman Jiang Yu Cheng Ning Ma Huaqing Ya Longwei Chen Shidong Fang Hansheng Feng Guang-Nan Luo Jiangang Li kaixin xiang Jie Cong Cheng Cheng Institute of Energy Hefei Comprehensive National Science Center(Anhui Energy Laboratory)Hefei 230088China Anbang Technology Co.Ltd Tongling 244000China Institute of Plasma Physics Hefei Institute of Matter ScienceChinese Academy of SciencesHefei 230031China

To reduce CO_(2) emissions from coal-fired power plants,the development of low-carbon or carbon-free fuel combustion technologies has become *** a new zero-carbon fuel,ammonia(NH_(3))can be used to address the storage and transportation issues of hydrogen *** it is not feasible to completely replace coal with ammonia in the short term,the development of ammonia-coal co-combustion technology at the current stage is a fast and feasible approach to reduce CO_(2) emissions from coal-fired power *** study focuses on modifying the boiler and installing two layers of eight pure-ammonia burners in a 300-MW coal-fired power plant to achieve ammonia-coal co-combustion at proportions ranging from 20%to 10%(by heat ratio)at loads of 180-to 300-MW,*** results show that,during ammonia-coal co-combustion in a 300-MW coal-fired power plant,there was a more significant change in NO_(x) emissions at the furnace outlet compared with that under pure-coal combustion as the boiler oxygen levels ***,ammonia burners located in the middle part of the main combustion zone exhibited a better high-temperature reduction performance than those located in the upper part of the main combustion *** all ammonia co-combustion conditions,the NH_(3) concentration at the furnace outlet remained below 1 parts per million(ppm).Compared with that under pure-coal conditions,the thermal efficiency of the boiler slightly decreased(by 0.12%-0.38%)under different loads when ammonia co-combustion reached 15 t·h^(-1).Ammonia co-combustion in coal-fired power plants is a potentially feasible technology route for carbon reduction.

关键词： Coal-fired boiler Coal mixing with ammonia Ammonia-coal co-firing Nitrogen oxide(NO_(x)) CO_(2)reduction Boiler thermal efficiency

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BMP9 induces osteogenic differentiation through up-regulating LGR4 via the mTORC1/ Stat3 pathway in mesenchymal stem cells

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Genes & Diseases 2024年第3期11卷 468-483页

作者： Jie Zhang Jinhai Jiang Hang Liu Shiyu Wang kaixin Ke Siyuan Liu Yue Jiang Lu Liu xiang Gao Baicheng He Yuxi Su Department of Pharmacology School of PharmacyChongqing Medical UniversityChongqing 400016China Key Laboratory of Biochemistry and Molecular Pharmacology of Chongqing Chongqing Medical UniversityChongqing 400016China Department of Orthopedics Second Affiliated Hospital of Chongqing Medical UniversityChongqing 400016China orthopedics Department Children's Hospital of Chongqing Medical UniversityChongqing 400014China China International Science and Technology Cooperation Base of Child Development and Critical Disorders Jiangxi Hospital Affiliated Children's Hospital of Chongqing Medical UniversityJiangxi 330000China National Clinical Research Center for Child Health and Disorders China

Bone defects and non-union are prevalent in clinical orthopedy,and the outcomes of current treatments are often *** tissue engineering offers a promising approach to treating these conditions *** morphogenetic protein 9(BMP9)can commit mesenchymal stem cells to osteogenic lineage,and a knowledge of the underlying mechanisms may help advance the field of bone tissue ***-rich repeats con-taining G protein-coupled receptor 4(LGR4),a member of G protein-coupled receptors,is essential for modulating bone *** study is aimed at investigating the impact of LGR4 on BMP9-induced osteogenesis in mesenchymal stem cells as well as the underlying *** marrow stromal cells from BMp9-knockout mice exhibited diminished LGR4 expression,and exogenous LGR4 clearly restored the impaired osteogenic potency of the bone marrow stromal ***,LGR4 expression was increased by BMP9 in C3H10T1/2 ***4 augmented the benefits of BMP9-induced osteogenic markers and bone formation,whereas LGR4 inhibition restricted these ***,the BMP9-induced li-pogenic markers were increased by LGR4 *** protein levels of Raptor and p-Stat3 were elevated by *** knockdown or p-Stat3 suppression attenuated the osteoblastic markers and LGR4 expression brought on by ***4 significantly reversed the blocking ef-fect of Raptor knockdown or p-Stat3 suppression on the BMP9-induced osteoblastic *** interacts with p-Stat3,and p-Stat3 activates the LGR4 promoter *** conclusion,LGR4 boosts BMP9 osteoblastic potency in mesenchymal stem cells,and BMP9 may up-regulate LGR4 via the mTORC1/Stat3 signal activation.

关键词： BMP9 LGR4 mTORC1 Osteogenic differentiation Stat3

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氨燃料发电研究进展

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工程热物理学报 2022年第8期43卷 2212-2224页

作者：陈磊方世东沈洁吴进丛杰香开新中国科学院合肥物质科学研究院合肥230031 合肥综合性国家科学中心能源研究院合肥230071 安徽大学物质科学与信息技术研究院合肥230601

氨是一种高效的氢载体,有望成为下一代无碳燃料,助力实现“碳达峰、碳中和”目标,本文介绍了氨燃料的研究背景和主要性质,调研总结了氨燃料在燃煤锅炉、燃气轮机和燃料电池发电方面的研究和发展趋势。通过控制掺氨比例、喷氨位置、喷氨... 详细信息

氨是一种高效的氢载体,有望成为下一代无碳燃料,助力实现“碳达峰、碳中和”目标,本文介绍了氨燃料的研究背景和主要性质,调研总结了氨燃料在燃煤锅炉、燃气轮机和燃料电池发电方面的研究和发展趋势。通过控制掺氨比例、喷氨位置、喷氨速度等可以实现氨/煤在燃煤锅炉中共燃;采用富–贫分级燃烧能降低燃气轮机的NO_(x)排放;氨燃料电池中氨在阳极上催化分解成氢气和氮气;氢气氧化释放的热量能有效地用于氨分解反应,提高氨燃料电池系统的能量效率。

关键词：氨燃料减碳锅炉燃气轮机燃料电池

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GFRP补片内SMA铺设构型对修理层合板热振动特性的影响

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复合材料学报 2024年第5期41卷 2487-2502页

作者：崔开心谢昊航任鹏卢翔中国民航大学航空工程学院天津300300 中国民航大学交通科学与工程学院天津300300

在复合材料中加入形状记忆合金(SMA)制成的纤维增强材料具有高强度、高阻尼与良好的自修复性等优点,可明显提高修理结构刚度及抗剥离性。为了探究热环境下玻璃纤维补片内嵌不同铺设数量与方式的SMA修理板的振动特性,基于Liang-Rogers的... 详细信息

在复合材料中加入形状记忆合金(SMA)制成的纤维增强材料具有高强度、高阻尼与良好的自修复性等优点,可明显提高修理结构刚度及抗剥离性。为了探究热环境下玻璃纤维补片内嵌不同铺设数量与方式的SMA修理板的振动特性,基于Liang-Rogers的SMA本构模型编制用户自定义材料子程序(UMAT),实现有限元精确求解。对比传统修理板与本文制备的SMA修理板的振型、固有频率及阻尼比变化情况,探究不同温度下SMA铺设构型对双面贴补修理玻璃纤维层合板振动特性的影响。实验与仿真结果表明:相较于单线型(D)与垂直交叉型(C),斜铺交叉型(X)SMA修理板前三阶振型更接近传统修理板(Q_(0)),且振型与嵌入的SMA数量无关。SMA相变时,内嵌SMA使修理板前二阶固有频率上升且上升率与SMA数量呈正相关,与SMA铺设方式关系如下:C型>D型>X型。内嵌SMA使修理板耗能能力及阻尼性优于Q_(0)板,与SMA数量呈正相关,与SMA铺设方式关系如下:X型>C型>D型。本文研究的铺设构型中,X_(24)型修理效果最优,其一、二阶固有频率最高可恢复至Q_(0)板的108.47%与112.26%,阻尼比相较于Q_(0)板增大了5.19倍。该工作可以为现有传统复合材料修理向智能复合材料修理技术转变提供参考。

关键词： SMA 编织玻璃纤维复合材料振动特性双面贴补修理智能材料

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DCGAN Based Spectrum Sensing Data Enhancement for Behavior Recognition in Self-Organized Communication Network

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China Communications 2021年第11期18卷 182-196页

作者： kaixin Cheng Lei Zhu Changhua Yao Lu Yu Xinrong Wu xiang Zheng Lei Wang Fandi Lin The College of Communications Engineering Army Engineering UniversityNanjing 210007China School of Electronic and Information Engineering Nanjing University of Information Science and Technology.Nanjing 210044China

Communication behavior recognition is an issue with increasingly importance in the antiterrorism and national defense ***,the sensing data obtained in actual environment is often not sufficient to accurately analyze the communication *** means can hardly utilize the scarce and crude spectrum sensing data captured in a real ***,communication behavior recognition using raw sensing data under smallsample condition has become a new *** this paper,a data enhanced communication behavior recognition(DECBR)scheme is proposed to meet this ***,a preprocessing method is designed to make the raw spectrum data suitable for the proposed ***,an adaptive convolutional neural network structure is exploited to carry out communication behavior ***,DCGAN is applied to support data enhancement,which realize communication behavior recognition under small-sample ***,the scheme is verified by experiments under different data *** results show that the DECBR scheme can greatly improve the accuracy and efficiency of behavior recognition under smallsample condition.

关键词： spectrum sensing communication behavior recognition small-sample data enhancement selforganized network

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巨厚砾岩油藏水力压裂三维诱导应力数值模拟

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断块油气田 2024年第5期31卷 836-842页

作者：王斌张景臣董景锋刘凯新王晓清郑伟杰孔辉丁祥中国石油大学(北京)理学院北京102249 中国石油新疆油田分公司工程技术研究院新疆克拉玛依834000 中国石油大学(北京)非常规油气科学技术研究院北京102249 新疆新易通石油科技有限公司新疆克拉玛依834099

巨厚砾岩储层立体井网开发模式下,多井压裂时,先压裂井对后续邻井干扰程度较大,但是目前压裂张开导致的诱导应力分布求解方法不明确,使得裂缝扩展形态模拟准确度降低,影响井组整体压裂方案设计和压后效果。针对这一问题,文中基于线弹性... 详细信息

巨厚砾岩储层立体井网开发模式下,多井压裂时,先压裂井对后续邻井干扰程度较大,但是目前压裂张开导致的诱导应力分布求解方法不明确,使得裂缝扩展形态模拟准确度降低,影响井组整体压裂方案设计和压后效果。针对这一问题,文中基于线弹性理论,运用位移不连续法建立了三维复杂裂缝张开诱导应力模型,模拟了巨厚砾岩立体井网条件下水力压裂后的应力场分布,并基于实际井组优化了水平井的压裂方式。结果表明:在单条裂缝张开时,相较于初始值,最小水平主应力的最大值增加了3.3 MPa,最大水平主应力的最大值增加了1.4 MPa,水平应力差降低;裂缝张开产生的诱导应力大小与裂缝宽度正相关,诱导应力随着裂缝宽度的增加而增加。实际井组模拟结果表明:层间交替压裂储层改造体积(SRV)为1825×10^(4)m^(3),同层顺序压裂SRV为1360×10^(4)m^(3);层间交替压裂同一位置的后续裂缝在起裂扩展过程中受到的诱导应力叠加影响更大,裂缝复杂度更高,SRV也更大。

关键词：巨厚砾岩水力压裂诱导应力 SRV

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Reprogramming the endogenous type I CRISPR-Cas system for simultaneous gene regulation and editing in Haloarcula hispanica

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mLife 2022年第1期1卷 40-50页

作者： kaixin Du Luyao Gong Ming Li Haiying Yu Hua xiang State Key Laboratory of Microbial Resources Institute of MicrobiologyChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina CAS Key Laboratory of Microbial Physiological and Metabolic Engineering Institute of MicrobiologyChinese Academy of SciencesBeijingChina

The type I system is the most widely distributed CRISPR-Cas system identified so ***,we have revealed the natural reprogramming of the type I CRISPR effector for gene regulation with a crRNA-resembling RNA in halophilic ***,we conducted a comprehensive study of the impact of redesigned crRNAs with different spacer lengths on gene regulation with the native type I-B CRISPR system in Haloarcula *** the spacer targeting the chromosomal gene was shortened from 36 to 28 bp,transformation efficiencies of the spacer-encoding plasmids were improved by over three orders of magnitude,indicating a significant loss of ***,by conducting whole-genome sequencing and measuring the growth curves of the hosts,we still detected DNA cleavage and its influence on cell ***,when the spacer was shortened to 24 bp,the transcription of the target gene was downregulated to 10.80%,while both interference and primed adaptation *** modifying the lengths of the spacers,the expression of the target gene could be suppressed to varying ***,by designing crRNAs with different spacer lengths and targeting different genes,we achieved simultaneous gene editing(cdc6E)and gene regulation(crtB)for the first time with the endogenous type I CRISPR-Cas system.

关键词： CRISPR-Cas system gene editing gene regulation type I

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Prevalence of maturity-onset diabetes of the young in phenotypic type 2 diabetes in young adults:a nationwide,multi-center,cross-sectional survey in China

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Chinese Medical Journal 2023年第1期136卷 56-64页

作者： Yan Chen Jing Zhao Xia Li Zhiguo Xie Gan Huang xiang Yan Houde Zhou Li Zheng Tao Xu kaixin Zhou Zhiguang Zhou National Clinical Research Center for Metabolic Diseases Key Laboratory of Diabetes Immunology(Central South University)Ministry of Educationand Department of Metabolism and EndocrinologyThe Second Xiangya Hospital of Central South UniversityChangshaHunan 410011China College of Life Sciences The University of Chinese Academy of SciencesBeijing 100049China National Laboratory of Biomacromolecules CAS Center for Excellence in BiomacromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijing 100101China Shandong First Medical University and Shandong Academy of Medical Sciences JinanShandong 271016China

Background:Maturity-onset diabetes of the young(MODY)is the most common monogenic *** aim of this study was to assess the prevalence of MODY in phenotypic type 2 diabetes(T2DM)among Chinese young ***:From April 2015 to October 2017,this cross-sectional study involved 2429 consecutive patients from 46 hospitals in China,newly diagnosed between 15 years and 45 years,with T2DM phenotype and negative for standardized glutamic acid decarboxylase antibody at the core *** using a custom monogenic diabetes gene panel was performed,and variants of 14 MODY genes were interpreted as per current ***:The survey determined 18 patients having genetic variants causing MODY(6 HNF1A,5 GCK,3 HNF4A,2 INS,1 PDX1,and 1 PAX4).The prevalence of MODY was 0.74%(95%confidence interval[CI]:0.40-1.08%).The clinical characteristics of MODY patients were not specific,72.2%(13/18)of them were diagnosed after 35 years,47.1%(8/17)had metabolic syndrome,and only 38.9%(7/18)had a family history of *** significant difference in manifestations except for hemoglobin A1c levels was found between MODY and non-MODY ***:The prevalence of MODY in young adults with phenotypic T2DM was 0.74%,among which HNF1A-,GCK-,and HNF4A-MODY were the most common *** features played a limited role in the recognition of MODY.

关键词： Maturity-onset diabetes of the young Type 2 diabetes Young adults

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财政压力、地方债务与企业杠杆率分化

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南方金融 2022年第6期 30-41页

作者：姚凯辛李为项后军广东金融学院区域金融政策研究中心广东广州510521 香港大学工程学院中国香港999077 广东金融学院金融与投资学院广东广州510521

本文采用2009-2018年A股上市公司样本数据,实证检验地方债务对实体企业杠杆率结构分化的影响以及财政压力在其中发挥的调节效应。结果表明:第一,地方债务规模扩张,总体上挤出了实体企业从银行获得的信贷资金,显著降低了企业的杠杆率。第... 详细信息

本文采用2009-2018年A股上市公司样本数据,实证检验地方债务对实体企业杠杆率结构分化的影响以及财政压力在其中发挥的调节效应。结果表明:第一,地方债务规模扩张,总体上挤出了实体企业从银行获得的信贷资金,显著降低了企业的杠杆率。第二,地方债务对于实体企业融资的挤出效应,存在显著的产权结构和期限结构分化,挤出效应主要体现在非国企部门和企业长期融资,对国企部门和企业短期融资影响不大。第三,财政压力催化地方债务导致企业杠杆率的产权结构分化和期限结构分化更加显著。以上研究结论的政策启示:推动经济高质量发展和供给侧结构性改革,应破除所有制问题上的传统观念束缚,有效解决民营企业融资难融资贵问题;进一步完善中央与地方财政事权与支出责任的匹配,合理控制地方债务扩张速度,避免实体企业融资被过度挤出。

关键词：财政政策财政压力地方债务企业杠杆率企业融资

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基于文献计量学的土壤固化剂研究进展与热点分析

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水利与建筑工程学报 2024年第2期22卷 132-141页

作者：庞帅刘宇芊樊恒辉张星宇霍江茹杨成朱开新李佳泽西北农林科技大学水利与建筑工程学院陕西杨凌712100 西北农林科技大学岩土工程研究所/特殊岩土博物馆陕西杨凌712100 辽宁工程技术大学土木工程学院辽宁阜新123000 重庆大学土木工程学院重庆400045

为了探索近40年来“土壤固化剂”研究领域的发展状况、热门观点及研究进展,基于文献计量学,检索和筛选中国知网数据库(CNKI)中从1983-2023年收录的关于“土壤固化剂”研究的文献数据,协同VOSviewer可视化软件对文献数据进行统计分析。... 详细信息

为了探索近40年来“土壤固化剂”研究领域的发展状况、热门观点及研究进展,基于文献计量学,检索和筛选中国知网数据库(CNKI)中从1983-2023年收录的关于“土壤固化剂”研究的文献数据,协同VOSviewer可视化软件对文献数据进行统计分析。分析结果表明:经过筛选共分析文献766篇,40年来论文产出演化进程分为萌芽阶段、发展阶段、深化阶段;主要研究机构为西北农林科技大学、长安大学等,其中水利部水土保持生态工程技术研究中心的高建恩团队、中国地质大学的项伟团队、西北农林科技大学的樊恒辉团队发文量较高;发文量较多的期刊分别为北方交通、交通世界,而被引量较高的期刊为岩土力学;国内该领域以土壤固化剂的研究为主,衡量指标以无侧限抗压强度为主,以“土壤固化剂”、“固化剂”、“无侧限抗压强度”为代表的关键词分别出现346次、126次、90次;土壤固化剂领域内出现频次≥5的热点关键词组有效聚类分为4个聚类群,聚类标签分别为土壤固化剂、固化剂、无侧限抗压强度、固化机理;主题演化分析显示,生态友好、高效可行的土壤加固技术为当下最活跃的研究领域,深入土木工程、土壤科学、土壤物理学以及材料科学等领域交叉融合是未来土壤固化剂研究发展的方向。未来在土壤机理深入研究及绿色环保固化技术、高效固化剂开发、一体化固化技术等方面将成为研究热点,致力于不断寻找绿色高效的固化剂,达到提高固化土壤的效果和速度。

关键词：土壤固化剂文献计量学可视化探析研究进展

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