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The Impact of City Cluster Development on the Inter-City Disparity:Evidence from China

Chinese Journal of Urban and Environmental Studies 2022年第1期10卷 96-118页

作者： yang mengyu HU Bingxuan The School of Economics Yunnan University

City clusters are important carriers for China's future urbanization and vital areas for promotingcoordinated regional development and common prosperity. The authors first divide the city clusters into Types Ⅰ, Ⅱ, and Ⅲ according to the characteristics of their development stages, and measure the degree of development of city clusters by using city-level night time light(NTL) data and inter-city commuting time, and empirically identify the types of China's city clusters. On that basis, the authors examine the influence of city cluster development on the inter-city disparity from a perspective of urban agglomeration. The results show that the development of Type Ⅰ city clusters can lead to the widest inter-city disparity, and that of Type Ⅱ city clusters ranks the second place in this regard, while that of Type Ⅲ city clusters can narrow the inter-city ***, using the 268-year historical geographic data of the Qing Dynasty, the authors construct instrumental variables to address the endogeneity issues, and find that the above conclusions are robust. This study also finds that the factor allocation for the development of Types Ⅰ and Ⅱ city clusters is oriented towards labor, while that for Type Ⅲ city clusters is oriented towards capital. Besides, different types of city clusters vary in the extent of correcting factor misallocation for their development. The differences in the orientation of factor allocation and the extent of factor misallocation correction constitute the main mechanism for the heterogeneous influence of city cluster development on the inter-city disparity. China's city cluster development strategy should adopt a category-based approach to avoid homogenization, conform to the objective laws, and make greater use of central cities' spatial spillover effects.

关键词： City cluster inter-city disparity nighttime light

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Coordination environments build up and tune a superior synergistic “genome” toward novel trifunctional (TM-N_(x)O_(4−x))@g- C_(16)N_(3)-H_(3): High-throughput inspection of ultra-high activity for water splitting and oxygen reduction reactions

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Nano Research 2024年第4期17卷 2337-2351页

作者： Chunyao Fang Xian Wang Qiang Zhang Xihang Zhang Chenglong Shi Jingcheng Xu mengyu yang Department of Physics University of Shanghai for Science and TechnologyShanghai 200093China School of Materials and Chemistry University of Shanghai for Science and TechnologyShanghai 200093China

Emerging as a prominent area of focus in energy conversion and storage technologies,the development of highly active metal-based single-atom catalysts(SACs)holds great signiﬁcance in searching alternatives to replace precious metals toward the efficient,stable,and low-cost hydrogen evolution reaction(HER),as well as the oxygen evolution reaction(OER)and the oxygen reduction reaction(ORR).Combining the tremendous tunability of ligand and coordination environment with rich metal-based electrocatalysts can create breakthrough opportunities for achieving both high stability and ***,we propose a novel and stable holey graphene-like carbon nitride monolayer g-C_(16)N5(N_(4)@g-C_(16)N_(3))stoichiometries interestingly behaving as a natural substrate for constructing SACs((TM-N_(4))@g-C_(16)N_(3)),whose evenly distributed holes map rich and uniform nitrogen coordination positions with electron-rich lone pairs for anchoring transition metal(TM)***,we employed density functional theory(DFT)calculations to systematically investigate the electrocatalytic activity of(TM-N_(4))@g-C_(16)N_(3) toward HER/OER/ORR,meanwhile considering the synergistic modulation of H-loading and O-coordination((TM-N_(x)O_(4-x))@g-C_(16)N_(3)^(-)H_(3),x=0–4).Together a“four-step procedure”screening mechanism with the first-principles high-throughput calculations,we find that(Rh-N_(4))and(Ir-N_(2)O_(2)-II)distributed on g-C_(16)N_(3)^(-)H_(3) can modulate the adsorption strength of the adsorbates,thus achieving the best HER/OER/ORR performance among 216 candidates,and the lowest overpotential of 0.098/0.3/0.46 V and 0.06/0.48/0.45 V,***,the d-band center,crystal orbital Hamilton population(COHP),and molecular orbitals are used to reveal the OER/ORR activity ***,the Rh/Ir-d orbital is dramatically hybridized with the O-p orbital of the oxygenated adsorbates,so that the lone-electrons incipiently locate at the antibonding orbital pair up and popula

关键词： single atom catalysts loading and coordination hydrogen evolution reaction oxygen evolution reaction oxygen reduction reaction

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The mediating role of organizational commitment between calling and work engagement of nurses: A cross-sectional study

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International Journal of Nursing Sciences 2019年第3期6卷 309-314页

作者： Yudi Cao Jingying Liu Kejia Liu mengyu yang Yanhui Liu School of Nursing Tianjin University of Traditional Chinese MedicineChina

Objective: Nurse shortage is a critical problem for global healthcare *** impacts the quality of clinical *** engagement is the core competence of hospitals,which indicates employee's positive attitude toward organization and *** study aimed to explore the relationships among calling,organizational commitment,and work ***: A cross-sectional study was designed,and 320 nurses from tertiary hospitals in China completed the questionnaires that included demographic information,calling scale,employee engagement scale,and organizational commitment *** correlation was performed to test the correlations among calling,organizational commitment,and work *** regression analyses were performed to explore the mediating role of organizational *** bootstrap method was employed to confirm the mediating ***: Nurses' work engagement score was at the medium degree,whereas calling and organizational commitment were in the medium to high *** results revealed that calling,organizational commitment,work engagement,and each dimension were positively correlated with one another (r=0.145-0.922,P < 0.01).The organizational commitment plays a partially mediating effect between calling and work engagement (β =0.603 to 0.333,P < 0.01).Conclusions: The mediation effect of organizational commitment was verified,which provided a comprehensive understanding of how calling impacted work ***,administrators should not only promote interventions to increase work engagement but also pay attention to calling and organizational commitment so as to improve their work *** together,increased level of work engagement is required in the current nursing field.

关键词： Nurses Calling Employee engagement Organizational commitment

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City Size,Population Concentration and Productivity: Evidence from China

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China & World Economy 2019年第1期27卷 110-131页

作者： Jie Shen Chunlai Chen mengyu yang Keyun Zhang Department of International Economies University of International RelationsChina Crawford School of Public Policy Australian National UniversityAustralia School of Economies Yunnan UniversityChina Institution of Regional and Urban Economics Renmin UniversityChina

This paper investigates the impact of China's city size and urban population concentration on city productivity by developing a distinctive index based on global nighttime light *** the panel data of 280 prefecture cities from 2004 to 2013 and employing dynamic system generalized method of moments and panel threshold model regression techniques,our results show that city size has a positive impact on city productivity;therefore,cities in China still have the potential to *** moderate urban population concentration can benefit city productivity,excessively concentrated urban population distribution may impede the growth of city *** also find that the level of labor income significantly affects the impacts of urban agglomeration on labor ***,our results imply that city development policies should focus more on how to appropriately allocate economic activities and adjust population distribution in urban areas according to different stages of economic development.

关键词： city size nighttime light data population concentration productivity

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Wu Ling,Research on Nishida Kitaro's View of Nation

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World History Studies 2022年第1期9卷 111-115页

作者： yang mengyu Harbin Normal University

As the founder of modern Japanese systematic philosophy,Nishida Kitaro devoted his life to constructing a unique philosophical *** the 1930s,Nishida was invited by the Japanese Army to give a speech entitled"Principles of the New World Order"at the National Policy Research *** this speech,Nishida stressed such issues as the Japanese national system,the royall family,the nation,the state,and the"new world order".

关键词：西田几多郎 such devoted

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Indigenous microbiota protects development of medication-related osteonecrosis induced by periapical disease in mice

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International Journal of Oral Science 2022年第2期14卷 156-163页

作者： Wen Du mengyu yang Terresa Kim Sol Kim Drake W.Williams Maryam Esmaeili Christine Hong Ki-Hyuk Shin Mo K.Kang No-Hee Park Reuben H.Kim State Key Laboratory of Oral Diseases&National Clinical Research Center for Oral Diseases&Department of Prosthodontics West China Hospital of StomatologySichuan UniversityChengduChina The Shapiro Family Laboratory of Viral Oncology and Aging Research Los AngelesUSA Section of Restorative Dentistry UCLA School of DentistryLos AngelesUSA Department of Orofacial Sciences UCSF School of DentistrySan FranciscoUSA UCLA Jonsson Comprehensive Cancer Center Los AngelesUSA David Geffen School of Medicine at UCLA Los AngelesUSA

Bacterial infection is a common finding in patients,who develop medication-related osteonecrosis of the jaw(MRONJ)by the longterm and/or high-dose use of anti-resorptive agents such as bisphosphonate(BPs).However,pathological role of bacteria in MRONJ development at the early stage remains ***,we demonstrated that commensal microbiota protects against MRONJ development in the pulp-exposed periapical periodontitis mouse model.C57/BL6 female mice were treated with intragastric broadspectrum antibiotics for 1 *** acid(ZOL)through intravenous injection and antibiotics in drinking water were administered for throughout the *** was exposed on the left maxillary first molar,then the mice were left for 5 weeks after which bilateral maxillary first molar was extracted and mice were left for additional 3 weeks to *** mice were harvested,and cecum,maxilla,and femurs were *** development was assessed usingμCT and histologic *** antibiotic was treated in mice,these mice had no weight changes,but developed significantly enlarged ceca compared to the control group(CTL mice).Periapical bone resorption prior to the tooth extraction was similarly prevented when treated with antibiotics,which was confirmed by decreased osteoclasts and *** treatment with pulp exposure significantly increased bone necrosis as determined by empty lacunae and necrotic bone ***,antibiotics treatment could further exacerbate bone necrosis,with increased osteoclast *** findings suggest that the commensal microbiome may play protective role,rather than pathological role,in the early stages of MRONJ development.

关键词： protective finding antibiotics

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基于自适应分块的高光谱图像压缩感知重构方法

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电子与信息学报 2023年第7期45卷 2605-2613页

作者：王洋杨孟宇赵首博哈尔滨理工大学测控技术与通信工程学院哈尔滨150080 广东海洋大学机械与动力工程学院湛江524000

在对高光谱图像采样重构的研究中,整体采样和固定分块采样没有考虑到高光谱图像复杂的纹理特征分布,使用了相同的测量矩阵导致图像的重构质量较差。针对此问题,该文提出基于2维图像熵自适应分块压缩感知重构方法(ABCS-IE),该方法以图像... 详细信息

在对高光谱图像采样重构的研究中,整体采样和固定分块采样没有考虑到高光谱图像复杂的纹理特征分布,使用了相同的测量矩阵导致图像的重构质量较差。针对此问题,该文提出基于2维图像熵自适应分块压缩感知重构方法(ABCS-IE),该方法以图像2维熵作为高光谱图像纹理细节的度量,根据图像的纹理细节分布自适应改变图像子块的大小,然后为不同的图像块分配特定的采样值,根据分配的采样值设计专有的测量矩阵对图像块进行压缩测量,将采样测量值代入重构算法中进行重构。实验结果表明,与整体采样重构和固定分块采样重构相比,将该方法应用到压缩感知重构算法中对高光谱图像进行采样重构后,重构的图像在视觉效果上有明显的提高,取得的峰值信噪比(PSNR)和结构相似度(SSIM)最大,采样率为0.4时,PSNR提高了2~4 dB,SSIM最大提高了0.27,均方根误差(RMSE)和信息熵差值(ΔH)也有所降低,说明重构的图像更加接近原始图像。而且运算时间也减少了1~1.5 s。可见,该方法能充分利用高光谱图像的纹理特征,有效提高图像的重构质量,同时减少重构的运算时间。

关键词：高光谱图像重构自适应分块压缩感知图像2维熵

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Zhang Xiaoxiao,Diocletianus

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World History Studies 2020年第2期7卷 119-124页

作者： yang mengyu Harbin Normal University

Diocletian rose up in the civil war and ended the crisis of the 3rd century A.D.;he restored the order of the Roman Empire and became one of the few successful emperors in the late *** promoted the political reformati... 详细信息

关键词：戴克里先 frontier 张晓

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规划引导型城市群战略深化路径研究

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区域经济评论 2020年第3期 90-98页

作者：杨孟禹杨雪云南大学经济学院昆明650500

规划引导型城市群是中国经济发展最弱但也是最具潜力的区域,从空间经济学角度来看,规划引导型城市群战略存在四个问题:城市群间协同政策不足、总体发展程度弱、核心城市不够发达、核心和外围城市间渠道不畅。在城市群发展时空演变理论... 详细信息

规划引导型城市群是中国经济发展最弱但也是最具潜力的区域,从空间经济学角度来看,规划引导型城市群战略存在四个问题:城市群间协同政策不足、总体发展程度弱、核心城市不够发达、核心和外围城市间渠道不畅。在城市群发展时空演变理论的基础上,结合8个城市群的不同特点,提出“十四五”时期规划引导型城市群的差异化战略深化路径。

关键词：城市群集聚经济核心—外围发展战略

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Growth Stage Prediction of Haematococcus pluvialis Based on GRNN and PNN Neural Networks

Growth Stage Prediction of Haematococcus pluvialis Based on ...

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第三十九届中国控制会议

作者： Shigang Cui mengyu yang Yongli Zhang Lin He Xingli Wu Tianjin University of Technology and Education Tianjin Key Laboratory of Information Sensing & Intelligent Control

Haematococcus pluvialis is a freshwater single-cell green algae and is currently considered to be the most ideal source of natural astaxanthin. When Haematococcus pluvialis is cultured in a "two-step method", it is mainly divided into cell proliferation stage and astaxanthin accumulation stage. Due to the long culture period of Haematococcus pluvialis and many factors during the cultivation process, experimentally measured characteristic values such as cell radius have a non-linear relationship with growth status. In this paper, the characteristic values of cell growth stage were characterized by cell radius, OD value（absorbance value） and cells number. The GRNN（Generalized Regression Neural Network） and PNN（Product-based Neural Network） neural networks with strong mapping capabilities and fast learning speed to build models, growth stage was predicted by the characteristic values of the cell, and compare the two prediction models, which is convenient for researchers to classify the two different growth stages of Haematococcus pluvialis cells and provide a basis for designing cell proliferation and astaxanthin accumulation experiments.

关键词： Haematococcus pluvialis GRNN neural network PNN neural network Growth stage prediction

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