Science Discovery最新文献_第6页

Oxygen Reduction Catalyst for Active Corrosion Protection of Epoxy Coating 环氧涂料活性防腐用氧还原催化剂

Science Discovery Pub Date : 2021-11-17 DOI: 10.11648/J.SD.20210906.25

Meng Cheng, Junhao Liu, Shuangqing Sun, Songqing Hu

{"title":"Oxygen Reduction Catalyst for Active Corrosion Protection of Epoxy Coating","authors":"Meng Cheng, Junhao Liu, Shuangqing Sun, Songqing Hu","doi":"10.11648/J.SD.20210906.25","DOIUrl":"https://doi.org/10.11648/J.SD.20210906.25","url":null,"abstract":"Metal corrosion has spread all over all aspects of national economy and life, causing serious economic losses and ecological hazards. Because of its excellent protective effect and universality, coating has become an important choice for metal corrosion protection. Although the conventional coating can realize metal corrosion protection with its shielding effect, the protection performance gradually decreases due to mechanical damage and corrosive species erosion. Based on the actual corrosion reaction process, the concept of nanocatalytic anticorrosion is proposed in this work to realize the long-term protection for metals. Firstly, oxygen reduction catalyst was obtained by confined pyrolysis and added into epoxy resin to prepare a new nanocatalytic anticorrosion coating, and then the protective performance of the coating was studied in detail. The results show that the catalyst adopt a uniform dodecahedral structure with excellent oxygen reduction ability, the half wave potential is 0.85 V. The catalyst added in the coating can spontaneously consume the diffused oxygen in the coating while enhancing the compactness of the coating to block the corrosive medium, reduceing the contribution of the corrosive medium to the corrosion reaction. Therefore, the probability of metal corrosion can be significantly reduced, and the service life of the coating for metal protection has been greatly prolonged.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86556762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characteristics of Trace Elements in Molybdenite and Its Application in Mineral Deposits 辉钼矿中微量元素特征及其在矿床中的应用

Science Discovery Pub Date : 2021-11-17 DOI: 10.11648/J.SD.20210906.20

Sun Pengcheng, Li Chao, Zhou Li-min, Q. Wenjun, Liao Xinwei, Zhao Hong, Du Andao

{"title":"Characteristics of Trace Elements in Molybdenite and Its Application in Mineral Deposits","authors":"Sun Pengcheng, Li Chao, Zhou Li-min, Q. Wenjun, Liao Xinwei, Zhao Hong, Du Andao","doi":"10.11648/J.SD.20210906.20","DOIUrl":"https://doi.org/10.11648/J.SD.20210906.20","url":null,"abstract":"Previous studies on molybdenite are mainly focused on Re-Os dating for a deposit, by contrast there have relatively little on trace elements in molybdenite. On the basis of statistical summarizing the previous research results, this paper discusses the variation of trace elements of molybdenite in various deposits and the combination of the different trace elements in molybdenite of different deposits, which is expected to expand its application in mineral deposit science. The results show that Re and W contents in molybdenite have the potential to be used as tracer to trace its sources. Molybdenite in different types of deposits has different trace elements composition and content, which mainly depends on the ore-forming fluids. Trace elements exist in various states in molybdenite, including isomorphic substitution, inclusion, adsorption and so on. Elements such as Re, W, Se, Te and Nb can enter the molybdenite lattice by replacing Mo or S, while Pb, Zr, Fe and REE those elements mainly appear as mineral inclusions. Most trace elements (for Fe, Cu, Te, etc.) are positively correlated, which may indicate that their sources are in similiar among each other. A few trace elements were negatively correlated with each other, which may reflect the different in their sources.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83101422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on Energy-saving Design of Immigrant Residential Buildings in Midwestern Ningxia 宁夏中西部移民住宅节能设计研究

Science Discovery Pub Date : 2021-11-12 DOI: 10.11648/J.SD.20210906.15

Liao Xueping, Shen Yongcheng, Zhang Yin, Liu Jiao

{"title":"Study on Energy-saving Design of Immigrant Residential Buildings in Midwestern Ningxia","authors":"Liao Xueping, Shen Yongcheng, Zhang Yin, Liu Jiao","doi":"10.11648/J.SD.20210906.15","DOIUrl":"https://doi.org/10.11648/J.SD.20210906.15","url":null,"abstract":"Based on the investigation of the indoor thermal environment of rural immigrant residential buildings in Shapotou District, Zhongwei City, Ningxia Province, the indoor thermal environment is tested and analyzed. Combined with the local geographical conditions and economic development, the external envelope structure is optimized, and the energy-saving transformation scheme of the envelope structure is put forward. The energy consumption analysis model is established by DeST software, The energy consumption of immigrant residential buildings before and after reconstruction is simulated. The results show that the maximum indoor natural temperature of the reconstructed building in the coldest month is increased by 6.45°C, the minimum temperature is increased by 4.51°C, the average temperature is increased by 5.57°C, and the building energy efficiency is increased by 63.4%. The cumulative load reduction of four immigrant villages in one year is converted into standard coal of about 3900t. The results provide a theoretical basis for improving the indoor thermal environment and reducing building energy consumption of immigrant residential buildings, and provide a reference for the development of residential buildings suitable for the local climate.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86531882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Boundary Regularity for Normalized Infinity Laplace Equations 归一化无穷拉普拉斯方程的边界正则性

Science Discovery Pub Date : 2021-11-12 DOI: 10.11648/J.SD.20210906.19

Yanhui Li, Xiaotao Huang

{"title":"The Boundary Regularity for Normalized Infinity Laplace Equations","authors":"Yanhui Li, Xiaotao Huang","doi":"10.11648/J.SD.20210906.19","DOIUrl":"https://doi.org/10.11648/J.SD.20210906.19","url":null,"abstract":"Infinity Laplace equations, which derive from minimal Lipschitz extensions and absolutely minimal variational problems, have been widely applied in zero-sum tug-of-war game, optimal transport, shape deformation and so on. However, due to the quasi-linearity, extreme degeneration (non-degeneration only in the gradient direction) and non-divergence of the equations, it is difficult to define its classical or weak solutions. After introducing the idea of viscosity solutions, the theoretical research of infinite Laplace equations begin to develop. We study the boundary Holder regularity of solutions for inhomogeneous normalized infinite Laplace equations on bounded domains. Main ideas are as follows: Firstly, we get bounded estimate of solutions through constructing barrier functions about super(sub)-solutions. Secondly, we use iterative method to approach the solutions of equations. Finally, we obtain regularity estimates near the boundary by calculating error between barrier functions and solutions of equations. This paper proves that the visvosity solutions of inhomogeneous normalized infinite Laplace equations are Holder continious on Lipschitz boundary provided that the region boundary is Lipschitz continuous, the right inhomogeneous term is positive (negative) continuous and the boundary values are Holder continuous. On the basis of our conclusion, the global Holder regularity theory of the normalized infinite Laplace equations can be obtained combining with the internal regularity estimates. In addition, this method can be extended to the boundary estimates of the infinite fractional Laplace equations.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87910534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparison of Damage Models of Reinforced Concrete Columns and Research on Improved Stiffness Model 钢筋混凝土柱损伤模型比较及改进刚度模型研究

Science Discovery Pub Date : 2021-11-12 DOI: 10.11648/J.SD.20210906.16

Liu Baichuan, Huang Weibing

{"title":"Comparison of Damage Models of Reinforced Concrete Columns and Research on Improved Stiffness Model","authors":"Liu Baichuan, Huang Weibing","doi":"10.11648/J.SD.20210906.16","DOIUrl":"https://doi.org/10.11648/J.SD.20210906.16","url":null,"abstract":"Based on the test data of reinforced concrete (RC) columns published in Pacific Earthquake Engineering Research Center (PEER) database, three existing typical seismic damage models are studied, and the distribution law of damage index of the same member calculated by energy dissipation model, stiffness degradation model and Park-Ang model are summarized. The relative stiffness with the yield stiffness as the reference is constructed, and the stiffness model is improved to solve the problems that the original stiffness model is too sensitive to the initial damage and the calculation accuracy is not high. The data show that the new model has high accuracy in calculating the damage index of components under earthquake. Comparing the damage index calculated by the model with the apparent damage phenomenon of each stage of the specimen, and comparing the damage development index of different models, it is found that the stiffness model is the most accurate to evaluate the damage. The damage grade evaluation standard based on stiffness degradation is proposed, and the damage indexes under three different damage states of Concrete Cracking, Significant Concrete Spalling and Long Bar Buckling are analyzed. The results show that the damage index calculated by the damage assessment method based on stiffness degradation has good correlation under different damage states.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75753087","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical Simulation of Dam-Break Flood Routing and Sediment Erosion and Deposition Under Different Rainfall Conditions 不同降雨条件下溃坝洪水路径与泥沙冲淤数值模拟

Science Discovery Pub Date : 2021-11-12 DOI: 10.11648/J.SD.20210906.11

S. Ming, Hou Lin, Z. Zhao, Zhu An, Qin Hao

{"title":"Numerical Simulation of Dam-Break Flood Routing and Sediment Erosion and Deposition Under Different Rainfall Conditions","authors":"S. Ming, Hou Lin, Z. Zhao, Zhu An, Qin Hao","doi":"10.11648/J.SD.20210906.11","DOIUrl":"https://doi.org/10.11648/J.SD.20210906.11","url":null,"abstract":"Landslide dam is a natural dam body formed by collapse, landslide and debris flow. The flood caused by dam break will cause significant risk to the downstream of the dam. Under the effect of rainfall environment, the erosion and deposition rate of flood and sediment in the downstream of the dam will be affected. This paper takes Tangjiashan dam as the research object, establishes the digital elevation model of the downstream channel according to the field survey and geological data, establishes the two-dimensional unsteady hydrodynamic model with the help of MIKE 21, explores the material movement law of the dam break flood in the downstream channel, and analyzes the influence of rainfall on the distribution of sediment deposition rate and sediment transport rate in the dam break flood The variation of riverbed thickness and the influence of flood sediment concentration rate. Based on the rainfall of dam break flood, this paper studies the sediment erosion and deposition law of dam break flood under different rainfall conditions. The results show that the occurrence of rainfall can significantly increase the sediment holding capacity of dam break flood. Under different rainfall intensities; The sediment deposition rate in floods will be affected by rainfall. The sediment deposition rate under the condition of rainfall is higher than that under the condition of no rainfall; Increasing rainfall intensity will increase the sedimentation thickness of the river bed near the collapse of the Tangjiashan dam, such as the collapse of the Shuimogou ditch. Based on the relevant research conclusions under different rainfall conditions, this paper could provide significant theoretical guidance for the flood erosion law of dam breaks and downstream rescue work.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86552618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Prognostic Value of Preoperative Neutrophil to Lymphocyte Ratio in the Penile Cancer: Meta Analysis 阴茎癌术前中性粒细胞/淋巴细胞比值的预后价值:Meta分析

Science Discovery Pub Date : 2021-11-12 DOI: 10.11648/J.SD.20210906.12

Yang Zeng, Xie Qun

{"title":"The Prognostic Value of Preoperative Neutrophil to Lymphocyte Ratio in the Penile Cancer: Meta Analysis","authors":"Yang Zeng, Xie Qun","doi":"10.11648/J.SD.20210906.12","DOIUrl":"https://doi.org/10.11648/J.SD.20210906.12","url":null,"abstract":"Objection: To evaluate the preoperative neutrophil to lymphocyte ratio in the prognosis of penile cancer. Methods: From the establishment of the database to January 2021, search for the Cochrane Library, PubMed, EMbase, CNKI, Wanfang database, papers that meet the inclusion and exclusion criteria will be obtained for meta analysis using RevMan 5.1 software and STATA 15.0 software. Results: Include 7 studies with 812 patients. The overall survival rate (HR=2.83 95% CI: 1.96-4.08, P<0.001) and progression-free survival rate (HR=1.62 95% CI: 1.17-2.23, P=0.004) of patients with preoperative high NLR was low; the overall survival of patients with positive lymph node metastasis (HR=4.13 95% CI: 2.47-6.90), P<0.001), progression-free survival (HR=3.88 95% CI: 2.15-5.32, P<0.001) is low; lymph node metastasis rate in patients with low NLR (OR=6.99 95%CI: 3.69-13.24, P<0.001) lower. Conclusions: Preoperative high NLR predicts a shorter overall survival rate and progression-free survival rate in patients with penile cancer. It can be considered that NLR is a simple and effective preoperative inflammatory index for predicting the prognosis of patients with penile cancer. It may provide a new perspective and help for clinical work, which will be good news for patients with penile cancer and clinicians.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"2021 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82888747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantitative Analysis of Spatial Distribution Characteristics of Traditional Villages in Hunan Province 湖南省传统村落空间分布特征定量分析

Science Discovery Pub Date : 2021-11-12 DOI: 10.11648/J.SD.20210906.13

Yao Wang, S. Yuan, Yin Xi

{"title":"Quantitative Analysis of Spatial Distribution Characteristics of Traditional Villages in Hunan Province","authors":"Yao Wang, S. Yuan, Yin Xi","doi":"10.11648/J.SD.20210906.13","DOIUrl":"https://doi.org/10.11648/J.SD.20210906.13","url":null,"abstract":"This study takes 658 traditional villages in Hunan province as the research object. Relying on ArcGIS geographic information system, the traditional villages in Hunan province were abstracted into point sets with attribute information. By means of average nearest neighbor distance analysis, kernel density analysis and intercity distribution comparison, the basic geographical characteristics of traditional villages in Hunan province were summarized, that is, significant agglomeration distribution, three agglomeration areas and uneven intercity distribution. Multiple types of natural geographical factors were superimposed, such as elevation, slope aspect, slope, river, water systems, annual precipitation and annual average temperature, so as to analyze the impact of elevation topography, river system and climate conditions on village site selection. With the help of geographic detector tool, the correlation between elevation, slope, water system, annual average temperature, annual precipitation and village distribution was quantitatively analyzed. Through the analysis of correlation degree, interaction and single factor characteristics, it is concluded that natural geographical factors are related to village distribution and multiple factors interact with each other. Based on the quantitative analysis of interactions between traditional villages and the natural environment, the distribution characteristics of traditional villages have been summarized, providing reference for the subsequent systematic research and protection of traditional villages.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84341055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mechanism of Transfer Story Beam-column in High-rise Buildings 高层建筑层间梁柱转换机理研究

Science Discovery Pub Date : 2021-11-12 DOI: 10.11648/J.SD.20210906.17

Chen Zhaorong, Cai Zhili, Bai Zhongkui, Z. Zhen

{"title":"Mechanism of Transfer Story Beam-column in High-rise Buildings","authors":"Chen Zhaorong, Cai Zhili, Bai Zhongkui, Z. Zhen","doi":"10.11648/J.SD.20210906.17","DOIUrl":"https://doi.org/10.11648/J.SD.20210906.17","url":null,"abstract":"The structural layout of the transfer floor is easy to cause the discontinuity of vertical components, Sudden change of floor lateral stiffness and floor shear capacity, they were unfavorable to the calculation of the overall index of the structure. In order to study the working mechanism of single span transfer beam on the first floor of high-rise building structure with or without interaction with wall, the mechanism of the beam and column was analyzed in the transfer layer of high-rise buildings, and the calculation methods of sectional moment for inertia beam and wall by using the calculation method of bending stiffness was put forward. A simple method for calculating the according to the different arrangement of the shear wall on the single-span transfer beam was deduced, the combined action of the transfer beam-shear wall and the non-combined action of the transfer beam-shear wall has been analyzed and calculated. The results show that, when the full span of the shear wall is arranged on the transfer beam and the deformation coordination is considered, the following conclusions are verified: the flexural rigidity of the transfer beam is suitable for the joint action of the beam and the shear wall of the upper layer ( 5 times amplification); Under the \"arching effect\", the transfer beam and the upper shear wall transform the vertical force into the horizontal support thrust, which increases the shear force of the frame pillar. It should be considered in the design. It can be used as a reference for engineering construction and design colleagues.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"196 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86238267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Study on Spatial Optimization of Urban Waterfront from the Perspective of Urban Renewal -- A Case Study of Dongguan Watertown Functional Area 城市更新视角下的城市滨水区空间优化研究——以东莞水城功能区为例

Science Discovery Pub Date : 2021-11-12 DOI: 10.11648/J.SD.20210906.14

Mingli Li

{"title":"Study on Spatial Optimization of Urban Waterfront from the Perspective of Urban Renewal -- A Case Study of Dongguan Watertown Functional Area","authors":"Mingli Li","doi":"10.11648/J.SD.20210906.14","DOIUrl":"https://doi.org/10.11648/J.SD.20210906.14","url":null,"abstract":"As an important public open space in the city, the spatial optimization of the waterfront is related to the overall style of the key urban areas and the quality of life of residents. Urban renewal combined with the waterfront space can effectively improve the vitality of the city and promote the development of the city. Due to the existing urban design itself for the material form of the emphasis and the lack of legal effect, the reality of waterfront space is still facing many problems, urgently need to be optimized. Urban renewal combined with waterfront space is a practical and efficient development path. Dongguan water function areas, for example, analyzing large river flood in the city plays an important role, based on space situation, under the background of urban renewal, from water body restoration, bank and revetment, roads and Bridges, the skyline and such, around the architecture and functions of five levels, to explore how the dongguan water function areas have local characteristics of waterfront space design, And put forward the optimization strategy. Centering on the aspects of ecology, culture and function, the overall planning strategy is put forward: combining ecology to create green waterfront space, combining culture to create characteristic waterfront space, combining function to create poetic waterfront space.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88581693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0