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Research on damage failure mechanism and dynamic mechanical behavior of layered shale with different angles under confining pressure
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作者 ning luo Haohao Zhang +4 位作者 Yabo Chai Penglong Li Cheng Zhai Jianan Zhou Tianran Ma 《Deep Underground Science and Engineering》 2023年第4期337-345,共9页
The hydrostatic or confining pressure of deep rocks has a significant impact on the mechanical behavior of brittle materials.Especially when confining pressure is applied,the mechanical properties of rock materials will ... The hydrostatic or confining pressure of deep rocks has a significant impact on the mechanical behavior of brittle materials.Especially when confining pressure is applied,the mechanical properties of rock materials will undergo significant changes.Considering that the process of shale sample subjected to impact load is in a closed container in the dynamic triaxial SHPB test,the failure process of the sample cannot be observed.Meanwhile,the activation volume of the shale sample would be large and local failure would occur in the test under the high strain rate loading.Therefore,thefinite element model of shale considering the bedding effect under confining pressure was established in this study.Taking shale materials with different bedding dip angles as simulation objects,the dynamic failure characteristics of shale were studied using the dynamic analysis software ANSYS/LS‐DYNA from three aspects:stress‐strain curve,failure growth process,and failure morphology.The research results obtained can serve as the key technical parameters for deep resource extraction. 展开更多
关键词 ANSYS/LS‐DYNA dynamic failure characteristics dynamic triaxial SHPB test shales with different bedding
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Experimental investigation of methane explosion fracturing in bedding shales:Load characteristics and three-dimensional fracture propagation
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作者 Yu Wang Cheng Zhai +5 位作者 Ting Liu Jizhao Xu Wei Tang Yangfeng Zheng Xinyu Zhu ning luo 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第10期1365-1383,共19页
Methane in-situ explosion fracturing(MISEF)enhances permeability in shale reservoirs by detonating desorbed methane to generate detonation waves in perforations.Fracture propagation in bedding shale under varying expl... Methane in-situ explosion fracturing(MISEF)enhances permeability in shale reservoirs by detonating desorbed methane to generate detonation waves in perforations.Fracture propagation in bedding shale under varying explosion loads remains unclear.In this study,prefabricated perforated shale samples with parallel and vertical bedding are fractured under five distinct explosion loads using a MISEF experimental setup.High-frequency explosion pressure-time curves were monitored within an equivalent perforation,and computed tomography scanning along with three-dimensional reconstruction techniques were used to investigate fracture propagation patterns.Additionally,the formation mechanism and influencing factors of explosion crack-generated fines(CGF)were clarified by analyzing the morphology and statistics of explosion debris particles.The results indicate that methane explosion generated oscillating-pulse loads within perforations.Explosion characteristic parameters increase with increasing initial pressure.Explosion load and bedding orientation significantly influence fracture propagation patterns.As initial pressure increases,the fracture mode transitions from bi-wing to 4–5 radial fractures.In parallel bedding shale,radial fractures noticeably deflect along the bedding surface.Vertical bedding facilitates the development of transverse fractures oriented parallel to the cross-section.Bifurcation-merging of explosioninduced fractures generated CGF.CGF mass and fractal dimension increase,while average particle size decreases with increasing explosion load.This study provides valuable insights into MISEF technology. 展开更多
关键词 Methane in-situ explosion fracturing Bedding shale Fracture propagation Three-dimensional reconstruction Crack-generated fines Fractal dimension
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硫辛酸对糖尿病足Wagner 2、3级患者氧化应激与炎症反应的影响 被引量:16
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作者 谢翠松 骆宁 谭艳飞 《中国现代医学杂志》 CAS 2019年第20期69-73,共5页
目的研究硫辛酸对糖尿病足Wagner2、3级患者氧化应激与炎症反应的影响。方法选取2015年8月-2017年12月郴州市第一人民医院内分泌科收治的糖尿病足Wagner2、3级患者100例,将其分为对照组和观察组,每组50例,分别行常规治疗和硫辛酸治疗。... 目的研究硫辛酸对糖尿病足Wagner2、3级患者氧化应激与炎症反应的影响。方法选取2015年8月-2017年12月郴州市第一人民医院内分泌科收治的糖尿病足Wagner2、3级患者100例,将其分为对照组和观察组,每组50例,分别行常规治疗和硫辛酸治疗。对比两组疗效、氧化应激及炎症反应因子改善情况。结果观察组治疗总有效率高于对照组(P<0.05);观察组治疗后高级氧化蛋白产物、丙二醛低于对照组(P<0.05),SOD高于对照组(P<0.05);观察组治疗后血管细胞黏附因子-1、成纤维细胞生长因子-2、肿瘤坏死因子-α、白细胞介素-6低于对照组(P<0.05)。结论硫辛酸能促进糖尿病足Wagner2、3级患者溃疡愈合,降低氧化应激与炎症反应因子水平。 展开更多
关键词 糖尿病足 硫辛酸 炎症
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问题导向学习法在临床医学科研型研究生教育中的应用 被引量:4
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作者 张亚飞 陈慧芳 +2 位作者 罗宁 於文丽 赵秋 《医学新知》 CAS 2022年第4期277-280,共4页
问题导向学习法(problem-based learning,PBL)已成为目前西方国家医学教育的主流模式之一,其在培养学生分析问题、解决问题以及自我学习能力等方面有极大促进作用。本文结合自身实践,就PBL在临床医学科研型研究生教育过程中的应用及相... 问题导向学习法(problem-based learning,PBL)已成为目前西方国家医学教育的主流模式之一,其在培养学生分析问题、解决问题以及自我学习能力等方面有极大促进作用。本文结合自身实践,就PBL在临床医学科研型研究生教育过程中的应用及相关问题进行论述。 展开更多
关键词 问题导向学习法 PBL 临床医学 研究生教育
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分期岛状包皮瓣尿道板重建术在重度尿道下裂中的应用 被引量:1
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作者 范世鹏 申吉泓 +3 位作者 李海源 高鸿斌 罗宁 赵晖 《昆明医科大学学报》 CAS 2022年第11期52-57,共6页
目的 研究分期岛状包皮瓣尿道板重建术在重度尿道下裂手术治疗中的临床效果。方法 回顾性分析2013年11月至2022年3月昆明医科大学第一附属医院治疗的重度尿道下裂患者28例临床资料。按照手术方法的不同,分为分期岛状包皮瓣尿道板重建术... 目的 研究分期岛状包皮瓣尿道板重建术在重度尿道下裂手术治疗中的临床效果。方法 回顾性分析2013年11月至2022年3月昆明医科大学第一附属医院治疗的重度尿道下裂患者28例临床资料。按照手术方法的不同,分为分期岛状包皮瓣尿道板重建术式手术组(A组)和传统分期手术(即:一期伸直阴茎,二期尿道成形术)组(B组)。比较2组患者的年龄、手术时间、出血量、术后并发症的发生率,并随访亲属对治疗的满意度。结果 分期岛状包皮瓣尿道板重建术的13例中,在首次手术时年龄2岁至34岁,尿道缺损长度3.5~6 cm;传统分期手术患者15例,第1次手术时年龄2岁至27岁,尿道缺损长度3~6 cm。2组患者的年龄、治疗时间、术中出血量差异无统计学意义(P> 0.05)。分期岛状包皮瓣尿道板重建术手术组术后2例发生尿道瘘,另1例发生阴茎头部尿道破裂。经再次尿道瘘修补/尿道成形治疗。传统分期手术组术后4例发生尿道瘘,2例尿道狭窄和尿道憩室。需经再次手术尿瘘修补术/尿道成形术,尿道扩张术治愈。分期岛状包皮板尿道板重建术组手术成功率为76.9%,传统分期手术组手术成功率为60.0%(P> 0.05)。且分期岛状包皮瓣尿道板重建术较传统分期手术术后满意度更高(P <0.05)。结论 分期岛状包皮瓣尿道板重建术已成为分期治愈尿道下裂的重要方法,对重度的尿道下裂术后安全性较好,外观比较满意,并发症发生率低,具有临床应用价值。 展开更多
关键词 尿道下裂 分期术 尿道成形术
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Nicotinamide overload may play a role in the development of type 2 diabetes 被引量:8
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作者 Shi-Sheng Zhou Da Li +19 位作者 Wu-Ping Sun Ming Guo Yong-Zhi Lun Yi-Ming Zhou Fu-Cheng Xiao Li-Xin Jing Shen-Xia Sun Li-Bin Zhang ning luo Fu-ning Bian Wei Zou Lai-Bin Dong Zhi-Gang Zhao Sheng-Fan Li Xiao-Jie Gong Zeng-Guo Yu Chang-Bin Sun Cong-Long Zheng Dong-Ju Jiang Zheng-ning Li 《World Journal of Gastroenterology》 SCIE CAS CSCD 2009年第45期5674-5684,共11页
AIM: To investigate whether nicotinamide overload plays a role in type 2 diabetes. METHODS: Nicotinamide metabolic patterns of 14 diabetic and 14 non-diabetic subjects were compared using HPLC. Cumulative effects of... AIM: To investigate whether nicotinamide overload plays a role in type 2 diabetes. METHODS: Nicotinamide metabolic patterns of 14 diabetic and 14 non-diabetic subjects were compared using HPLC. Cumulative effects of nicotinamide and N^1-methylnicotinamide on glucose metabolism, plasma HzO2 levels and tissue nicotinamide adenine dinucleotide (NAD) contents of adult Sprague-Dawley rats were observed. The role of human sweat glands and rat skin in nicotinamide metabolism was investigated using sauna and burn injury, respectively. RESULTS: Diabetic subjects had significantly higher plasma N^1-methylnicotinamide levels 5 h after a 100-mg nicotinamide load than the non-diabetic subjects (0.89 ± 0.13 μmol/L vs 0.6 ± 0.13 μmol/L, P 〈 0.001). Cumulative doses of nicotinamide (2 g/kg) significantly increased rat plasma Nl-methylnicotinamide concentrations associated with severe insulin resistance, which was mimicked by Nl-methy-Inicotinamide. Moreover, cumulative exposure to N^1- methylnicotinamide (2 g/kg) markedly reduced rat muscle and liver NAD contents and erythrocyte NAD/ NADH ratio, and increased plasma H2O2 levels. Decrease in NAD/NADH ratio and increase in H2O2 generation were also observed in human erythrocytes after exposure to N^1-methylnicotinamide in vitro. Sweating eliminated excessive nicotinamide (5.3-fold increase in sweat nicotinamide concentration 1 h after a 100-mg nicotinamide load). Skin damage or aldehyde oxidase inhibition with tamoxifen or olanzapine, both being notorious for impairing glucose tolerance, delayed N^1- methylnicotinamide clearance. CONCLUSION: These findings suggest that nicotinamide overload, which induced an increase in plasma N^1- methylnicotinamide, associated with oxidative stress and insulin resistance, plays a role in type 2 diabetes. 展开更多
关键词 Type 2 diabetes NICOTINAMIDE N^1-methyl-nicotinamide Insulin resistance Oxidative stress Liver Sweat glands
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球形表面富锰Mn_(x)Co_(3-x)O_(4-η)尖晶石型催化剂选择性催化还原NO_(x)研究 被引量:1
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作者 高凤雨 刘恒恒 +7 位作者 姚小龙 Zaharaddeen Sani 唐晓龙 罗宁 易红宏 赵顺征 于庆君 周远松 《物理化学学报》 SCIE CAS CSCD 北大核心 2023年第9期136-148,共13页
采用共沉淀法制备了高比表面积的Mn_(x)Co_(3-x)O_(4)球形催化剂,研究了NH3选择性催化还原NOx性能。Mn-Co金属氧化物具有尖晶石结构,随着Co含量的增加,晶体结构由四方相转变为立方相。高浓度的表面活性氧物种和变价元素的强有效电子转移... 采用共沉淀法制备了高比表面积的Mn_(x)Co_(3-x)O_(4)球形催化剂,研究了NH3选择性催化还原NOx性能。Mn-Co金属氧化物具有尖晶石结构,随着Co含量的增加,晶体结构由四方相转变为立方相。高浓度的表面活性氧物种和变价元素的强有效电子转移(Co^(3+)+Mn^(3+)↔Co^(2+)+Mn^(4+))有利于提高Mn_(x)Co_(3-x)O_(4)(x=1.0、1.5、2.0)尖晶型石催化剂的氧化还原能力,催化剂表面的Mn富集作用形成了氧缺陷结构和丰富的表面活性位点,进一步促进SCR脱硝反应,呈现出优异的催化性能。COtet(CoMn)octO_(4)晶体结构中,Mn离子(Mn^(3+)和Mn^(4+),以三价锰为主)和部分Co离子被配置到八面体中心,这些物种作为活性位点存在着较强的电子转移交互作用,该构型对促进低温脱硝活性和保护活性位点耐受SO_(2)毒害具有重要的意义。Mn-Co尖晶石表面的NH_(3)-SCR脱硝反应过程主要遵循Eley-Rideal反应机理,即吸附态NH_(3)与气态NO(或NO_(2))的反应路径。随着反应温度的增加,反应生成的NH_(4)NO_(3)中间体很可能转化为NH_(4)NO_(2)物种,进而分解为N_(2),提高了催化剂的氮气选择性。 展开更多
关键词 Mn-Co复合氧化物 尖晶石结构 富锰表面 选择性催化还原 协同作用 反应机理
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SYNTHESIS OF BLOCK COPOLYMER BY INTEGRATED LIVING ANIONIC POLYMERIZATION-ATOM TRANSFER RADICAL POLYMERIZATION(ATRP)
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作者 Bing Liu Feng Liu +2 位作者 ning luo Sheng-kang Ying Qing Liu Laboratory of Living Polymerization, East China University of Science and Technology, Shanghai 200237, China Research Institute of Beijing Yanshan Petrochemical Corporation, Beijing 102549, China 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2000年第1期39-43,共5页
Alpha-trichloroacetoxy terminated polystyrene oligomer (PS-CH2CH2OCOCCl3) and poly-(styrene-b-butadiene) oligomer [P(S-b-B)-CH2CH2OCOCCl3)] were synthesized by living anionic polymeri-zation using n-butyllithium as in... Alpha-trichloroacetoxy terminated polystyrene oligomer (PS-CH2CH2OCOCCl3) and poly-(styrene-b-butadiene) oligomer [P(S-b-B)-CH2CH2OCOCCl3)] were synthesized by living anionic polymeri-zation using n-butyllithium as initiator. Then the PS-CH2CH2OCOCCl3 (PS-Cl-3) or P(S-b-B)-CH2CH2O-COCCl3 (PSB-Cl-3) was used as the macroinitiator in the polymerization of(meth)acrylates in the presence of CuX/bpy. AB diblock and ABC triblock copolymers were prepared by the integrated living anionic polymerization (LAP)-atom transfer radical polymerization (ATRP). The structures of the PSB-Cl-3 and the P(S-b-MMA) were identified by FTIR and H-1-NMR spectrum, respectively. A new way to design block copolymers (the combination of LAP and ATRP) was developed. 展开更多
关键词 living anionic polymerization atom transfer radical polymerization block copolymer
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A new dynamic subgrid-scale model using artificial neural network for compressible flow
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作者 Han Qi Xinliang Li +1 位作者 ning luo Changping Yu 《Theoretical & Applied Mechanics Letters》 CAS CSCD 2022年第4期267-274,共8页
The subgrid-scale(SGS)kinetic energy has been used to predict the SGS stress in compressible flow and it was resolved through the SGS kinetic energy transport equation in past studies.In this paper,a new SGS eddy-visc... The subgrid-scale(SGS)kinetic energy has been used to predict the SGS stress in compressible flow and it was resolved through the SGS kinetic energy transport equation in past studies.In this paper,a new SGS eddy-viscosity model is proposed using artificial neural network to obtain the SGS kinetic energy precisely,instead of using the SGS kinetic energy equation.Using the infinite series expansion and reserving the first term of the expanded term,we obtain an approximated SGS kinetic energy,which has a high correlation with the real SGS kinetic energy.Then,the coefficient of the modelled SGS kinetic energy is resolved by the artificial neural network and the modelled SGS kinetic energy is more accurate through this method compared to the SGS kinetic energy obtained from the SGS kinetic energy equation.The coefficients of the SGS stress and SGS heat flux terms are determined by the dynamic procedure.The new model is tested in the compressible turbulent channel flow.From the a posterior tests,we know that the new model can precisely predict the mean velocity,the Reynolds stress,the mean temperature and turbulence intensities,etc. 展开更多
关键词 Subgrid-scale kinetic energy Eddy-viscosity model Compressible flow
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Protective effect of Fructus Mume total flavone against SH-SY5Y cells damage induced by MPP+and its mechanism
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作者 Chun-Ling Wang Xiao-Dong Wen +3 位作者 ning luo Yuan-Jing Jiang Ying Jiang Zhen Zeng 《Journal of Hainan Medical University》 2021年第7期11-15,共5页
Objective:To investigate the neuroprotective effects of Fructus Mume total flavone(FMF)against cell apoptosis and mitochondrial injury induced by 1-methyl-4-phenylpyridinium(MPP^(+))in human neuroblastoma(SH-SY5Y)cell... Objective:To investigate the neuroprotective effects of Fructus Mume total flavone(FMF)against cell apoptosis and mitochondrial injury induced by 1-methyl-4-phenylpyridinium(MPP^(+))in human neuroblastoma(SH-SY5Y)cells and explore its molecular mechanisms.Methods:MPP^(+) induced SH-SY5Y cells injury model were established in vitro cell culture,the cells were divided into 5 groups:normal control group,model group(250μmol·L^(-1) MPP^(+)),FMF low-and middle-and high-dose experimental group(10,50,100μmol·L^(-1) FMF).After 72 h administration,4’,6-diamidino-2-phenylindole(DAPI)staining was used to observe the effects of different concentrations of FMF on the morphologic changes of apoptotic cells,the ratio of cell apoptosis was measured by Annexin-FITC/PI double staining.The mitochondrial membrane electro-bit were detected by flow cytometry(FCM).The expression of Bcl-2,Bax and Caspase-3 were detected by Western blot.Results:The results of DAPI staining showed that the injury SH-SY5Y cells induced by MPP+were densely condensed,the nucleus showed nuclear shrinkage,showing an apoptotic characteristic morphology;after 72h of FMF action,the apoptotic morphology of the cells showed different degrees of improvement,and the apoptotic number of SH-SY5Y cells also decreased.Compared with that in the normal control group,the apoptotic rate and of mitochondrial membrane electrobit of SH-SY5Y cells in the model group increased significantly(P<0.01),the expression of Bax and Caspase-3 proteins increased significantly(P<0.01),Bcl-2 protein and the ratio of Bcl-2/Bax decreased significantly(P<0.01).Compared with that in the model group,the apoptotic rate and mitochondrial membrane electro-bit of SH-SY5Y cells in FMF groups(10,50,100μmol·L^(-1))were significantly lower,while Bax and Caspase-3 proteins were significantly lower(P<0.01),and Bcl-2 protein and the ratio of Bcl-2/Bax were significantly higher,with statistically significant difference in FMF middle-and high-dose experimental groups(P<0.01).The results indicated that FMF can decrease the experession level of Bax and Caspase-3 and increase the ratio of Bcl-2/Bax,inhibit MPP+induced apoptosis.Conclusion:FMF improves the damage of SH-SY5Y cells induced by MPP+,and plays a neuroprotective effect by regulating the expressions of related proteins in mitochondrial apoptosis pathway. 展开更多
关键词 Parkinson’s disease Fructus Mume total flavone 1-METHYL-4-PHENYLPYRIDINIUM SH-SY5Y cell Cell apoptosis
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Transformation and Upgrading and Countermeasures of Agricultural Industry in Xixia County,Henan Province
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作者 ning luo Shijie LI 《Asian Agricultural Research》 2021年第1期4-7,共4页
[Objectives]Industrial prosperity is an important part of implementing rural revitalization strategy,and promoting the transformation and upgrading of the agricultural industry has strong practical significance for th... [Objectives]Industrial prosperity is an important part of implementing rural revitalization strategy,and promoting the transformation and upgrading of the agricultural industry has strong practical significance for the development of high-quality agriculture and the construction of a modern agricultural industry system.[Methods]Based on the overview of agricultural production in Xixia County from 2012 to 2018,the status,advantages and main problems of the agricultural industry development in the county are sorted out.[Results]The fruit-medicine-fungus featured agriculture has begun to take shape,and the effect of industrial clusters and large-scale operations has begun to become prominent.The output of shiitake mushrooms,Chinese patent medicines and kiwifruit all shows a steady growth trend.Excellent varieties,brand building,and deep integration of the three industries are the key factors for the development of agricultural industrialization.[Conclusions]In the context of the implementation of the rural revitalization strategy,countermeasures and suggestions on the development of ecological green agriculture,high-quality agriculture,brand agriculture,and modern agricultural management system are put forward. 展开更多
关键词 Rural revitalization Production system Industrial transformation Industrial integration Agricultural industry
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Numerical Experiments of Pore Scale for Electrical Properties of Saturated Digital Rock
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作者 Wenzheng Yue Guo Tao +1 位作者 Xiaochuan Zheng ning luo 《International Journal of Geosciences》 2011年第2期148-154,共7页
The two dimensional Lattice Gas Automation (LGA) was applied to simulate the current flow in saturated digital rock for revealing the effects of micro structure and saturation on the electrical transport properties. T... The two dimensional Lattice Gas Automation (LGA) was applied to simulate the current flow in saturated digital rock for revealing the effects of micro structure and saturation on the electrical transport properties. The digital rock involved in this research can be constructed by the pile of matrix grain with radius obtained from the SEM images of rock sections. We further investigate the non-Archie phenomenon with the LGA and compare micro-scale numerical modeling with laboratory measurements. Based on results, a more general model has been developed for reservoir evaluation of saturation with higher accuracy in oilfield application. The calculations from the new equation show very good agreement with laboratory measurements and published data on sandstone samples. 展开更多
关键词 LATTICE Gas Automation DIGITAL ROCK Non-Archie Phenomenon Water SATURATION
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Study on the Characteristics of Atmospheric Dry and Wet Deposition in the Upper Reaches of Baiyangdian
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作者 Ye LI Hongbo LI +2 位作者 Qi ZHAO ning luo Xinyong CHEN 《Meteorological and Environmental Research》 CAS 2022年第1期63-66,共4页
To study the characteristics of atmospheric dry and wet deposition in the upper reaches of Baiyangdian,two sampling sites in Baoding City were monitored for 1 year from September 2018 to August 2019.The results showed... To study the characteristics of atmospheric dry and wet deposition in the upper reaches of Baiyangdian,two sampling sites in Baoding City were monitored for 1 year from September 2018 to August 2019.The results showed that the dry and wet deposition fluxes of total nitrogen(TN)during the monitoring period were 6.87 and 6.46 kg/(hm^(2)·a),respectively.The ratio of wet to dry deposition of TN was approximately 1∶1,with wet deposition being dominated by ammonium nitrogen deposition.The dry and wet deposition fluxes of total phosphorus(TP)were 0.228 and 0.125 kg/(hm^(2)·a),and it was dominated by dry deposition.The average concentration of TN in wet deposition exceeded the standard threshold for eutrophic waters,and its ecological effects on the Baiyangdian basin should be concerned.Wet deposition fluxes of nitrogen and phosphorus had a significantly positive correlation with rainfall,while their deposition concentrations were negatively correlated with rainfall.The dry deposition of atmospheric nitrogen and phosphorus was influenced by the amount of dustfall and climatic factors such as rainfall,temperature,and humidity,which mainly occurred from April to August. 展开更多
关键词 Atmospheric deposition Dry and wet deposition Nitrogen deposition Phosphorus deposition Deposition flux
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A New High-Precision and Lightweight Detection Model for Illegal Construction Objects Based on Deep Learning
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作者 Wenjin Liu Lijuan Zhou +2 位作者 Shudong Zhang ning luo Min Xu 《Tsinghua Science and Technology》 SCIE EI CAS CSCD 2024年第4期1002-1022,共21页
Illegal construction has caused serious harm around the world. However, current methods are difficult to detect illegal construction activities in time, and the calculation complexity and the parameters of them are la... Illegal construction has caused serious harm around the world. However, current methods are difficult to detect illegal construction activities in time, and the calculation complexity and the parameters of them are large. To solve these challenges, a new and unique detection method is proposed, which detects objects related to illegal buildings in time to discover illegal construction activities. Meanwhile, a new dataset and a high-precision and lightweight detector are proposed. The proposed detector is based on the algorithm You Only Look Once (YOLOv4). The use of DenseNet as the backbone of YDHNet enables better feature transfer and reuse, improves detection accuracy, and reduces computational costs. Meanwhile, depthwise separable convolution is employed to lightweight the neck and head to further reduce computational costs. Furthermore, H-swish is utilized to enhance non-linear feature extraction and improve detection accuracy. Experimental results illustrate that YDHNet realizes a mean average precision of 89.60% on the proposed dataset, which is 3.78% higher than YOLOv4. The computational cost and parameter count of YDHNet are 26.22 GFLOPs and 16.18 MB, respectively. Compared to YOLOv4 and other detectors, YDHNet not only has lower computational costs and higher detection accuracy, but also timely identifies illegal construction objects and automatically detects illegal construction activities. 展开更多
关键词 object detection LIGHTWEIGHT illegal buildings illegal construction objects HIGH-PRECISION
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Remarkable N_(2)-selectivity enhancement of NH_(3)-SCR over HPMo modified MnCo-BTC@SiO_(2) catalyst 被引量:1
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作者 Songjin Ko Xiaolong Tang +3 位作者 Fengyu Gao Honghong Yi Hengheng Liu ning luo 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2024年第4期482-495,共14页
In this work,the phosphomolybdate(HPMo)modification strategy was applied to improve the N_(2) selectivity of Mn Co-BTC@SiO_(2)catalyst for the selective catalytic reduction of NO_(x),and further,the mechanism of HPMo ... In this work,the phosphomolybdate(HPMo)modification strategy was applied to improve the N_(2) selectivity of Mn Co-BTC@SiO_(2)catalyst for the selective catalytic reduction of NO_(x),and further,the mechanism of HPMo modification on enhanced catalytic performance was explored.Among Mn Co-BTC@SiO_(2-x) catalysts with different HPMo concentrations,Mn CoBTC@SiO_(2)-0.75 catalyst exhibited not only the highest NH_(3)-SCR performance(95% at 200-300℃)but also the best N_(2)selectivity(exceed 80% at 100-300℃)due to the appropriate redox capacity,greater surface acidity.X-ray photoelectron spectrometer(XPS)and temperature programmed reduction of H_(2)(H_(2)-TPR)results showed that the modification with HPMo reduced the oxidation-reduction performance of the catalyst due to electron transfer from Mo^(5+)to Mn^(4+)/Mn^(3+)and prevent the excessive oxidation of ammonia adsorption species.NH_(3)temperature-programmed desorption of(NH_(3)-TPD)results showed that the modification with HPMo could significantly improve the surface acidity and NH_(3)adsorption,which enhance the catalytic activity and N_(2)selectivity.In-situ diffused reflectance infrared Fourier transform spectroscopy(in-situ DRIFTS)revealed that modification with HPMo increased significantly the amount of adsorbed NH_(3)species on the Bronsted acid site and C_(B)/C_(L),it suppressed the production of N_(2)O by inhibiting the production of NH species,the deep dehydrogenation of ammonia adsorption species.This study provided a simple design strategy for the catalyst to improve the low-temperature catalytic performance and N_(2)selectivity. 展开更多
关键词 Metal organic framework(MOF) MnCo-BTC@SiO_(2) NH_(3)-SCR HPMo N_(2)selectivity
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Low-temperature NH_(3)-SCR performance of a novel Chlorella@Mn composite denitrification catalyst
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作者 Hengheng Liu Fengyu Gao +5 位作者 Songjin Ko ning luo Xiaolong Tang Erhong Duan Honghong Yi Yuansong Zhou 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2024年第3期271-286,共16页
The synthesis process of conventional Mn-based denitrification catalysts is relatively complex and expensive.In this paper,a resource application of chlorella was proposed,and a Chlorella@Mn composite denitrification ... The synthesis process of conventional Mn-based denitrification catalysts is relatively complex and expensive.In this paper,a resource application of chlorella was proposed,and a Chlorella@Mn composite denitrification catalyst was innovatively synthesized by electrostatic interaction.The Chlorella@Mn composite denitrification catalyst prepared under the optimal conditions(0.54 g/L Mn^(2+)concentration,20 million chlorellas/mL concentration,450℃ calcination temperature)exhibited a well-developed pore structure and large specific surface area(122 m^(2)/g).Compared with MnOx alone,the Chlorella@Mn composite catalyst achieved superior performance,with~100%NH_(3)selective catalytic reduction(NH_(3)-SCR)denitrification activity at 100-225℃.The results of NH_(3)temperature-programmed desorption(NH_(3)-TPD)and H_(2)temperature-programmed reduction(H_(2)-TPR)showed that the catalyst had strong acid sites and good redox properties.Zeta potential testing showed that the electronegativity of the chlorella cell surface could be used to enrich with Mn^(2+).X-ray photoelectron spectroscopy(XPS)confirmed that Chlorella@Mn had a high content of Mn^(3+)and surface chemisorbed oxygen.In-situ diffuse refectance infrared Fourier transform spectroscopy(in-situ DRIFTS)experimental results showed that both Langmuir-Hinshelwood(L-H)and Eley-Rideal(E-R)mechanisms play a role in the denitrification process on the surface of the Chlorella@Mn catalyst,where the main intermediate nitrate species is monodentate nitrite.The presence of SO_(2)promoted the generation and strengthening of Bronsted acid sites,but also generated more sulfate species on the surface,thereby reducing the denitrification activity of the Chlorella@Mn catalyst.The Chlorella@Mn composite catalyst had the characteristics of short preparation time,simple process and low cost,making it promising for industrial application. 展开更多
关键词 Chlorella@Mn catalyst NH_(3)-SCR Poisoning resistance Reaction mechanism Infuence of SO_(2)
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Neutral color and self-healable electrochromic system based on CuI/Cu and I_(3)^(-)/I^(-)conversions
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作者 Junsen Zhong Bingkun Huang +7 位作者 Kunjie Yang Zuju Ma Lingyu Du ning luo Fengjiao Tang Chuanxin Hou Fuyi Jiang Litao Kang 《Nano Research》 SCIE EI CSCD 2024年第5期4437-4443,共7页
The electrochromic(EC)mechanisms of inorganic materials are usually based on reversible cation insertion/extraction or metal deposition/dissolution,which are plagued by ion trapping and dendrite growth,respectively.In... The electrochromic(EC)mechanisms of inorganic materials are usually based on reversible cation insertion/extraction or metal deposition/dissolution,which are plagued by ion trapping and dendrite growth,respectively.In this paper,a novel conversion-type electrochromic mechanism is proposed,by making good use of the CuI/Cu redox couple.This CuI-based electrochromic system shows a neutral color switching from transparent and dim grey.By simply increasing the bleaching voltage,I_(3)^(-)/I^(-)redox couple can be further activated.The generated I_(3)^(-)will readily react with Cu,effectively improving the conversion reversibility and thereby rejuvenating the degraded electrochromic performance.Thanks to the well-designed electrode and the self-healing ability,this conversion electrochromic system achieves rapid response times(tcoloring:23 s,tbleaching:6 s),decant optical modulation amplitude(26.4%),high coloration efficiency(86.15 cm^(2)·C^(-1)),admirable cyclic durability(without performance degradation after 480 cycles)and excellent optical memory ability(transmittance variation<1%after 10 h open-circuit storage).The establishment of this conversion-type electrochromism may inspire the exploration of novel electrochromic materials and devices. 展开更多
关键词 electrochromic CUI conversion reaction SELF-HEALING neutral color
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固相萃取分离铀 被引量:3
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作者 李波 马利建 +3 位作者 罗宁 李首建 陈云明 张劲松 《化学进展》 SCIE CAS CSCD 北大核心 2020年第9期1316-1333,共18页
铀是重要的核工业原料,也是一种有较强化学和生物毒性的重金属。从各类含铀水体系中分离和回收铀对缓解铀资源短缺,保护人类健康和生态环境安全都具有重要的科学和实际意义。本文简要回顾和评述了近15年来具有代表性的新型固相萃取材料... 铀是重要的核工业原料,也是一种有较强化学和生物毒性的重金属。从各类含铀水体系中分离和回收铀对缓解铀资源短缺,保护人类健康和生态环境安全都具有重要的科学和实际意义。本文简要回顾和评述了近15年来具有代表性的新型固相萃取材料及其在铀分离方面的应用研究,并对相关材料在铀分离领域的应用前景进行了分析和展望。 展开更多
关键词 固相萃取 固相萃取剂 吸附 分离
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Distributed processing based fault location,isolation,and service restoration method for active distribution network 被引量:16
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作者 Jiaming WENG Dong LIU +1 位作者 ning luo Xueyong TANG 《Journal of Modern Power Systems and Clean Energy》 SCIE EI 2015年第4期494-503,共10页
Active distribution network(ADN)is a solution for power system with interconnection of distributed energy resources(DER),which may change the network operation and power flow of traditional power distribution network.... Active distribution network(ADN)is a solution for power system with interconnection of distributed energy resources(DER),which may change the network operation and power flow of traditional power distribution network.However,in some circumstances the malfunction of protection and feeder automation in distribution network occurs due to the uncertain bidirectional power flow.Therefore,a novel method of fault location,isolation,and service restoration(FLISR)for ADN based on distributed processing is proposed in this paper.The differential-activated algorithm based on synchronous sampling for feeder fault location and isolation is studied,and a framework of fault restoration is established for ADN.Finally,the effectiveness of the proposed algorithm is verified via computer simulation of a case study for active distributed power system. 展开更多
关键词 Active distribution network Fault location ISOLATION and service restoration Distributed processing method
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Numerical simulation of oxide nanoparticle growth characteristics under the gas detonation chemical reaction by space-time conservation element-solution element method 被引量:1
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作者 ning luo Hua Shen +2 位作者 Hongwen Jing Zhangguo Ma Weiming Yang 《Particuology》 SCIE EI CAS CSCD 2017年第6期78-83,共6页
Under harsh conditions (such as high temperature, high pressure, and millisecond lifetime chemical reaction), a long-standing challenge remains to accurately predict the growth characteristics of nanosize spherical ... Under harsh conditions (such as high temperature, high pressure, and millisecond lifetime chemical reaction), a long-standing challenge remains to accurately predict the growth characteristics of nanosize spherical particles and to determine the rapid chemical reaction flow field characteristics, The growth characteristics of similar spherical oxide nanoparticles are further studied by successfully introducing the space-time conservation element-solution element (CE/SE) algorithm with the monodisperse Kruis model. This approach overcomes the nanosize particle rapid growth limit set and successfully captures the characteristics of the rapid gaseous chemical reaction process. The results show that this approach quantitatively captures the characteristics of the rapid chemical reaction, nanosize particle growth and size distribution. To reveal the growth mechanism for numerous types of oxide nanoparticles, it is very important to choose a rational numerical method and particle physics model. 展开更多
关键词 Oxide nanoparticles Growth characteristics Space-time conservation element-solutionelement method Kruis model Gas detonation
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