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低碳试点政策是否提高了城市碳排放效率——基于低碳试点城市的准自然实验研究

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自然资源学报 2022年第7期37卷 1876-1892页

作者：郭沛梁栋山西大学经济与管理学院太原030006

作为推动我国低碳经济发展的重要政策,低碳试点城市建设成效在当今我国面临碳减排及经济下行双重压力的情况下显得尤为重要。基于2006—2018年间的279个地级市样本数据,运用超效率SBM模型核算了城市碳排放效率,并通过双重差分模型实证... 详细信息

作为推动我国低碳经济发展的重要政策,低碳试点城市建设成效在当今我国面临碳减排及经济下行双重压力的情况下显得尤为重要。基于2006—2018年间的279个地级市样本数据,运用超效率SBM模型核算了城市碳排放效率,并通过双重差分模型实证检验了低碳试点政策对城市碳排放效率的影响。研究表明:低碳试点政策能够显著提高城市碳排放效率,这一结论在经过PSM-DID等一系列稳健性检验后仍然成立。异质性分析发现,低碳试点政策对碳排放效率的影响在东西部及非资源型地区更显著。机制分析则表明,低碳试点政策的政策效应主要通过提高城市技术创新水平和调整城市能源结构来发挥作用。区分东中西地区的作用机制检验结果表明,东部地区的试点政策主要通过调整能源结构及产业结构合理化来影响碳排放效率,西部地区和中部地区则分别主要通过技术创新和产业结构合理化发挥作用。本文为加强低碳试点城市建设、实现碳减排与经济发展双赢提供了有益的经验启示。

关键词：低碳试点碳排放效率超效率SBM模型双重差分模型

Design and high-power test of 800-kW UHF klystron for CEPC

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Chinese Physics B 2022年第8期31卷 154-159页

作者： Ou-Zheng Xiao Shigeki Fukuda Zu-Sheng Zhou Un-Nisa Zaib Sheng-Chang Wang Zhi-Jun Lu guo-Xi pei Munawar Iqbal Dong Dong Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China High Energy Accelerator Research Organization KEKOhoIbaraki 305-0801Japan

To reduce the energy demand and operation cost for circular electron positron collider(CEPC), the high efficiency klystrons are being developed at Institute of High Energy Physics, Chinese Academy of Sciences. A 800-k W continuous wave(CW) klystron operating at frequency of 650-MHz has been designed. The results of beam–wave interaction simulation with several different codes are presented. The efficiency is optimized to be 65% with a second harmonic cavity in three-dimensional(3D) particle-in-cell code CST. The effect of cavity frequency error and mismatch load on efficiency of klystron have been investigated. The design and cold test of reentrant cavities are described, which meet the requirements of RF section design. So far, the manufacturing and high-power test of the first klystron prototype have been *** the gun operated at DC voltage of 80 k V and current of 15.4 A, the klystron peak power reached 804 k W with output efficiency of about 65.3% at 40% duty cycle. The 1-d B bandwidth is ±0.8 MHZ. Due to the crack of ceramic window, the CW power achieved about 700 kW. The high-power test results are in good agreement with 3D simulation.

关键词： klystron cavity beam–wave interaction circular electron positron collider(CEPC) high-power test

工艺参数对连续流化床内铁矿粉还原效果的影响

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工程科学学报 2018年第10期40卷 1231-1236页

作者：郭培民赵沛王磊孔令兵中国钢研科技集团新冶高科技集团有限公司

为了研究工艺参数对连续流化床内铁矿粉还原效果的影响规律,建立了两级连续流化床内氧化铁还原及煤气氧化耦合动力学模型.R1级流化床主要为FeO的还原,采用优质煤气作为还原剂,FeO来自R2级反应器;R2级流化床主要将Fe2O3还原到FeO,Fe2O3... 详细信息

为了研究工艺参数对连续流化床内铁矿粉还原效果的影响规律,建立了两级连续流化床内氧化铁还原及煤气氧化耦合动力学模型.R1级流化床主要为FeO的还原,采用优质煤气作为还原剂,FeO来自R2级反应器;R2级流化床主要将Fe2O3还原到FeO,Fe2O3来自预热的R3流化床反应器,还原气来自R1还原尾气.模型主要计算结果与文献吻合.并以此为模型研究了矿粉粒度、流化床内压力等参数对流化床还原效果的影响.为了取得矿粉平均金属化率不小于85%、煤气利用率不低于38%和气矿比950～1050 m3·t-1的还原效果,流化床应满足如下工艺条件：矿粉平均粒度1.5 mm以下,流化床温度780～800℃,煤气还原势不低于93%,惰性气体体积分数小于5%,R1流化床内煤气平均压力3.5×10^5～4.0×10^5Pa,停留时间的倒数ug/H=1.0～1.1 s-1,R1流化床矿粉平均停留时间30 min,R2流化床矿粉平均停留时间20 min.

关键词：铁矿粉流化床气基还原气体利用率金属化率动力学

Ratio of visceral fat area to body fat mass(VBR)is a superior predictor of coronary heart disease

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Chinese Medical Journal 2023年第19期136卷 2380-2382页

作者： Binbin Zhang Jiangshan He pei guo Jianxiong Wang Chunjun Li Li Zhang Congfang guo Yirui guo Fenghua guo Mianzhi Zhang Minying Zhang School of Medicine Nankai UniversityTianjin 300071China Graduate School Tianjin Medical UniversityTianjin 300070China Tianjin Union Medical Center Tianjin 300071China Tianjin First Central Hospital Tianjin 300071China Dongfang Hospital Beijing University of Chinese MedicineBeijing 100071China Tianjin Academy of Traditional Chinese Medicine Affiliated Hospital Tianjin 300120China

To the Editor:Cardiovascular disease(CVD)remains a leading cause of morbidity and mortality globally,with coronary heart disease(CHD)exhibiting the highest mortality *** is an important risk factor for cardiometabolic complication and *** adipose(VA)and subcutaneous adipose(SA)tissues exert differential and possibly opposing effects on cardiometabolic outcomes.

关键词： mortality coronary visceral

Application of Ginkgo biloba L. Extract at the Early Stage of Tumor Development Helps Cyclophosphamide Inhibit the Growth of Tumor Cells

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Biomedical and Environmental Sciences 2021年第12期34卷 1010-1014页

作者： YANG Jing Hui MENG Fan Zhu BESELER Cheryl L LI Hao LIU Xiao Mei guo Yin pei QIN Li Li ZUO Ru Yue REN Shu Ping Department of Liver Gallbladder and PancreasChina-Japan Union HospitalJilin UniversityChangchun 130030JilinChina Department of Occupational and Environmental Health School of Public HealthJilin UniversityChangchun 130021JilinChina Department of Environmental Agricultural and Occupational HealthCollege of Public HealthUniversity of Nebraska Medical CenterOmahaNebraskaUSA 68198-4388 Department of Radiation Chemistry and Toxicology School of Public HealthJilin UniversityChangchun 130021JilinChina

Globally,breast cancer is the second major cause of cancer death among women[1].Cyclophosphamide(CTX)is a common chemotherapeutic agent for patients with breast cancer who have undergone *** metabolites act by disrupting deoxyribonucleic acid and by arresting the cell cycle of tumor cells,which results in their apoptosis or growth inhibition[2].However,CTX triggers the production of excessive amounts of reactive oxygen species(ROS),which produces various side effects in different organs or systems[3].In the initial stage of cancer development,ROS may promote the expansion of cancerous cells by modifying apoptosis-related genes[4].Furthermore,ROS will activate the NF-κB pathway and NF-κB-dependent genes that are involved in apoptosis and cell adhesion,which are implicated in multiple aspects of cancer development[5].ROS,as a survival or apoptotic signal to cancer cells,is determined by the dosage,duration,type,and site of ROS production[6].

关键词： dosage organs cancer

NHC-Au（Ⅰ）-catalyzed synthesis of benzo[b][1,4]diazepines from N-substituted o-phenylenediamines and terminal alkynes

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NHC-Au（Ⅰ）-catalyzed synthesis of benzo[b][1,4]diazepines ...

The Importance of Endocervical Curettage in an Old Post-Loop Electrosurgical Excision Procedure Woman with Abnormal Cervical Cytology and a Normal Punch Biopsy Histology:A Case Report and Literature Review

第十七届全国金属有机化学学术讨论会

作者： pei guo Xiaoming Zeng Si Chen Meiming Luo College of Chemistry Sichuan University Frontier Institute of Science and Technology Xi′an Jiaotong University

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Reproductive and Developmental Medicine 2019年第3期3卷 191-193页

作者： Luo-pei guo Qing Cong Hao Zhang Long Sui Medical Center of Diagnosis and Treatment for Cervical Diseases Obstetrics and Gynecology Hospital of Fudan UniversityShanghai 200011China Department of Pathology Obstetrics and Gynecology Hospital of Fudan UniversityShanghai 200011China Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases Fudan UniversityShanghai 200011China

Endocervical curettage(ECC)is an optional practice during colposcopy,and the indication for endocervical curettage(ECC)is controversial between Europe and the ***,we explored the value of ECC in a specific *** elderly post-loop electrosurgical excision procedure woman,who had undergone a colposcopy 4 months before,went for her follow-up and abnormal cytology was found,and both the ECC and punch biopsy showed negative ***,a second ECC was performed,which led to the diagnosis of a high-grade squamous intraepithelial *** case report shows that ECC is useful for diagnosing elderly women with Type 3 squamocolumnar junction.

关键词： Endocervical Curettage High-Grade Squamous Intraepithelial Lesion Loop Electrosurgical Excision Procedure

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数字经济的减污降碳协同作用及机制——基于地级市数据的实证检验

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资源科学 2023年第11期45卷 2117-2129页

作者：郭沛王光远山西大学经济与管理学院太原030006

【目的】数字经济是实现中国新旧动能转换的重要着力点,与经济社会各领域广泛融合和不断发展,赋予中国减污降碳协同效应新的动力机制,在推进”美丽中国“建设与实现”双碳“气候承诺的关键窗口期,研究数字经济发展的减污降碳协同作用是... 详细信息

【目的】数字经济是实现中国新旧动能转换的重要着力点,与经济社会各领域广泛融合和不断发展,赋予中国减污降碳协同效应新的动力机制,在推进”美丽中国“建设与实现”双碳“气候承诺的关键窗口期,研究数字经济发展的减污降碳协同作用是实现绿色和高质量发展背景下的重要命题。【方法】本文基于277个地级及以上城市的面板数据,运用固定效应、中介效应等方法,从多维度检验数字经济的减污降碳协同作用及其中介机制。【结果】研究发现:①数字经济发展显著促进了减污降碳协同效应,采用工具变量法、剔除直辖市等方法进行内生性和稳健性检验后结论仍成立。②选取“宽带中国”战略作为外生政策冲击,以多期DID模型评估数字经济对减污降碳协同效应的影响,回归结果表明“宽带中国”战略对减污降碳协同效应具有显著正向影响。③机制分析发现,提高技术水平、优化产业结构、增强公众环境监督可以促进数字经济的减污降碳协同效应。④区域异质性分析表明,东部地区和非资源型城市数字经济对减污降碳协同效应的影响更显著,而在中西部地区和资源型城市中影响不显著,这主要与区域之间的数字经济发展水平不平衡有关。【结论】应大力发展数字经济,加快新型基础设施建设,从政府、企业和公众多维度加强环保意识和行动,依托各地区资源比较优势,充分释放数字经济的潜能,实现减污降碳协同增效。

关键词：数字经济减污降碳协同效应宽带中国双重差分模型异质性

pH-Controlled DNA Molecular Switch Using Minidumbbell

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医用生物力学 2019年第A1期34卷 176-176页

作者： pei guo Sik Lok Lam School of Biology and Biological Engineering South China University of TechnologyGuangzhou510006China Department of Chemistry The Chinese University of Hong KongShatinNew TerritoriesHong Kong

DNA is an attractive biomaterial for constructing nanomachines and nanomaterials owing to their self-recognition and self-assembly *** addition to the well-known double helical structures,DNA molecules can also form a variety of unusual structures like hairpins,triplexes and *** unusual DNAs sometimes have advantages over double helical DNAs in constructing nanomachines such as enhanced thermodynamic stability and higher sensitivity to external stimuli,which made them as promising motifs in recenttwo *** of how complicated DNA-based nanomachines are,the fundamental concept in these nanomachines is based on a proper design and usage of DNA molecular *** the reported DNA molecular switches,pH-controlled systems show great potentials in drug delivery and cellular pH *** to now,most of the reported pH-controlled molecular switches used i-motif or triplex ***,owing to the relatively long sequence requirement for the formation of i-motif and triplex DNAs,an invading DNA strand needs to be added to activate the molecular switch,and thus DNA wastes will be generated into the system and a full structural conversion will usually take a relatively long time of minutes to *** overcome the disadvantages of DNA waste generation and slow kinetics,molecular switches using smaller-size,thermodynamically stable and pH-sensible unusual DNA structures will have the advantages of easier manipulation and faster ***,we discovered a new type of unusual DNA structure called the minidumbbell(MDB)which is formed by a single-strand 8-nucleotide *** MDB is composed of two type II tetraloops in which the first and fourth loop residues form loop-closing base pairs,the second loop residues fold into the minor groove to form base-base stacking or mispairing interactions,and the third loop residues stack on their nearby loop-closing base *** particular,the MDB formed by a sequence containing two CCTG re

关键词： MDB pH-Controlled DNA Molecular Switch Using Minidumbbell DNA