检索结果-南通市图书馆

含Cu低碳钢I&Q&P工艺处理后的组织与性能

在线全文

学校读者我要写书评

暂无评论

金属热处理 2016年第8期41卷 76-80页

作者：陈连生徐静辉田亚强郑小平宋进英米振鹏华北理工大学河北省现代冶金技术重点实验室河北唐山063009

对一种含Cu低碳硅锰钢分别采用I&Q、Q&P和I&Q&P热处理工艺,研究双相区Cu配分行为并分析其对马氏体组织形貌、残留奥氏体及力学性能的影响。结果表明,试验钢经I&Q工艺处理,在双相区保温时Cu元素从铁素体向奥氏体中配分,Cu配分明显,并且... 详细信息

对一种含Cu低碳硅锰钢分别采用I&Q、Q&P和I&Q&P热处理工艺,研究双相区Cu配分行为并分析其对马氏体组织形貌、残留奥氏体及力学性能的影响。结果表明,试验钢经I&Q工艺处理,在双相区保温时Cu元素从铁素体向奥氏体中配分,Cu配分明显,并且不影响C和Mn的配分效果。试验钢经I&Q&P工艺处理后,组织基本为板条马氏体,且马氏体板条清晰,部分板条有断裂的现象。与经Q&P工艺处理相比,试验钢经I&Q&P工艺处理后残留奥氏体体积分数显著提高,从9.6%提高到了13.2%。对比Q&P工艺,试验钢经I&Q&P工艺处理后,抗拉强度有一定降低,但伸长率大大提高,强塑积达到27 GPa·%。

关键词：低碳钢 Cu配分 I&Q&P工艺显微组织力学性能

Fe-C-Mn-Cu钢I&Q处理中Cu元素的配分行为

在线全文

学校读者我要写书评

暂无评论

金属热处理 2016年第7期41卷 107-111页

作者：陈连生徐静辉田亚强郑小平宋进英米振鹏华北理工大学河北省现代冶金技术重点实验室河北唐山063009

对一种含Cu低碳硅锰钢进行双相区保温淬火(I&Q)热处理工艺,采用电子探针和扫描电镜研究其双相区元素配分规律和元素配分对马氏体形貌的影响。结果表明,在800℃的双相区,C、Mn、Cu分别从铁素体向奥氏体中配分,Cu配分效果明显,并且不影响C... 详细信息

对一种含Cu低碳硅锰钢进行双相区保温淬火(I&Q)热处理工艺,采用电子探针和扫描电镜研究其双相区元素配分规律和元素配分对马氏体形貌的影响。结果表明,在800℃的双相区,C、Mn、Cu分别从铁素体向奥氏体中配分,Cu配分效果明显,并且不影响C、Mn配分效果。随着保温时间的延长,高Cu区域的面积和钢中Cu的最高浓度均呈增长趋势,在2400 s时达到化学势平衡状态。马氏体体积分数随着保温时间的延长逐渐增加至饱和,马氏体从块状向板条状转变。

关键词：含Cu低碳钢双相区保温淬火(I&Q)工艺 Cu配分保温时间马氏体

I&Q&P下双相区配分温度对含铜低碳钢组织与性能的影响

在线全文

学校读者我要写书评

暂无评论

金属热处理 2016年第10期41卷 162-166页

作者：陈连生米振鹏田亚强郑小平宋进英徐静辉华北理工大学河北省现代冶金技术重点实验室河北唐山063009

采用场发扫描电镜、X射线衍射仪和电子探针研究了双相区合金元素不同配分温度对0.12C-1.33Mn-0.55Cu钢的组织性能和残留奥氏体含量的影响。结果表明:试验钢在双相区配分后,C、Cu和Mn元素均出现明显的配分效果,且Cu、Mn元素配分作用有利... 详细信息

采用场发扫描电镜、X射线衍射仪和电子探针研究了双相区合金元素不同配分温度对0.12C-1.33Mn-0.55Cu钢的组织性能和残留奥氏体含量的影响。结果表明:试验钢在双相区配分后,C、Cu和Mn元素均出现明显的配分效果,且Cu、Mn元素配分作用有利于盐浴分级淬火C配分进行,保留更多残留奥氏体提高塑性;I&Q&P工艺处理得到马氏体和残留奥氏体组织,随着双相区配分温度提高原奥氏体晶粒尺寸变大,马氏体板条变粗,位向增多;随着配分温度的提高,试验钢的抗拉强度提高,伸长率逐渐下降,残留奥氏体含量的变化趋势与伸长率基本一致,在780℃时强塑积最大为26 GPa·%,此时残留奥氏体体积分数为14.7%,伸长率为24.4%,综合力学性能最佳。

关键词： I&Q&P工艺双相区配分温度力学性能残留奥氏体

Boosting Photocatalytic Performance of Cu-Mn Co-doped CeO_(2) Nanoparticles for Tetracycline Degradation

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 42-48页

作者： XU Rongqi mi Jianxin WANG Shulin XU Man ZHU Li BAI Lei TANG Dandan LEI Yu Engineering Research Center of Environmental Materials and Membrane Technology of Hubei Province School of Materials Science and EngineeringWuhan Institute of TechnologyWuhan 430205China Shaanxi Coal Chemical Industry Technology Research Institute Co. Ltd.Xi’an 710100China

Cu-Mn co-doped CeO_(2) photocatalyst was successfully synthesized by the sol-gel method to assess its capability in degrading *** and TEM results showed that Cu and Mn were successfully co-doped into CeO_(2) without forming heterostructure,XPS and photoelectrochemical results revealed that Mn ions doping amplified the generation of photo-induced charge carriers,while Cu ions doping significantly facilitated the interfacial charge transfer ***,the optimized Cu3Mn2CeO_(2) nanoparticles exhibited the highest TC removal efficiency,achieved a rate of 78.18%and maintained a stable cycling performance.

关键词： photocatalyst co-doped charge separation water treatment

Highly mass activity electrocatalysts with ultralow Pt loading on carbon black for hydrogen evolution reaction

在线全文

学校读者我要写书评

暂无评论

International Journal of minerals,Metallurgy and Materials 2025年第1期32卷 182-190页

作者： Shaorou Ke Yajing Zhao Xin min Yanghong Li Ruiyu mi Yangai Liu Xiaowen Wu minghao Fang Zhaohui Huang Engineering Research Center of ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid WastersNational Laboratory of Mineral MaterialsSchool of Materials Science and TechnologyChina University of Geosciences(Beijing)Beijing 100083China

Pt-based nanocatalysts offer excellent prospects for various ***,the low loading of Pt with excellent performance for efficient and stable nanocatalysts still presents a considerable *** this study,nanocatalysts with ultralow Pt content,excellent performance,and carbon black as support were prepared through in-situ ***~2-nm particles uniformly and stably dispersed on carbon black because of the strong s-p-d orbital hybridizations between carbon black and Pt,which suppressed the agglomeration of Pt *** unique structure is beneficial for the hydrogen evolution *** catalysts exhibited remarkable catalytic activity for hydrogen evolution reaction,exhibiting a potential of 100 mV at 100 mA·cm^(-2),which is comparable to those of commercial Pt/C *** activity(1.61 A/mg)was four times that of a commercial Pt/C catalyst(0.37 A/mg).The ultralow Pt loading(6.84wt%)paves the way for the development of next-generation electrocatalysts.

关键词： hydrogen evolution reaction ultralow platinum in-situ synthesis ultrasound

Insights into spinal muscular atrophy from molecular biomarkers

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第7期20卷 1849-1863页

作者： Xiaodong Xing Xinzhu Liu Xiandeng Li mi Li Xian Wu Xiaohui Huang Ajing Xu Yan Liu Jian Zhang Department of Clinical Pharmacy Xinhua HospitalShanghai Jiao Tong University School of MedicineShanghaiChina College of Pharmacy Chongqing Medical UniversityChongqingChina

Spinal muscular atrophy is a devastating motor neuron disease characterized by severe cases of fatal muscle *** is one of the most common genetic causes of mortality among infants aged less than 2 *** research is currently receiving more attention,and new candidate biomarkers are constantly being *** review initially discusses the evaluation methods commonly used in clinical practice while briefly outlining their respective pros and *** also describe recent advancements in research and the clinical significance of molecular biomarkers for spinal muscular atrophy,which are classified as either specific or non-specific *** review provides new insights into the pathogenesis of spinal muscular atrophy,the mechanism of biomarkers in response to drug-modified therapies,the selection of biomarker candidates,and would promote the development of future ***,the successful utilization of biomarkers may facilitate the implementation of gene-targeting treatments for patients with spinal muscular atrophy.

关键词： biomarkers disease progression gene-targeting therapy neurofilaments Nusinersen spinal muscular atrophy(SMA) survival motor neuron therapeutic evaluation treatment outcomes

Cu配分时间对I&Q&P处理钢组织性能影响

在线全文

学校读者我要写书评

暂无评论

热加工工艺 2016年第14期45卷 229-232页

作者：陈连生徐静辉田亚强郑小平宋进英米振鹏华北理工大学河北省现代冶金技术重点试验室河北唐山063009

通过I&Q(两相区退火+淬火)和I&Q&P(两相区退火+淬火+配分)热处理工艺,采用EPMA、SEM和XRD等手段,研究含Cu低碳钢Cu配分行为及不同配分时间对组织性能的影响。结果表明,在双相区保温过程中,试验钢的C、Cu和Mn三种元素均从铁素体向奥氏体... 详细信息

通过I&Q(两相区退火+淬火)和I&Q&P(两相区退火+淬火+配分)热处理工艺,采用EPMA、SEM和XRD等手段,研究含Cu低碳钢Cu配分行为及不同配分时间对组织性能的影响。结果表明,在双相区保温过程中,试验钢的C、Cu和Mn三种元素均从铁素体向奥氏体中配分,且Cu元素配分效果明显。经I&Q&P工艺处理的钢的组织是板条马氏体和残余奥氏体,随着Cu配分时间增加,原始晶粒尺寸变大,马氏体组织变大、板条变粗。随着Cu配分时间增加,钢的抗拉强度逐渐减小,伸长率先增加后减小。残余奥氏体体积分数的变化趋势和伸长率的变化趋势基本一致,在配分时间为40 min时,残余奥氏体体积分数和伸长率达到最大值,此时材料综合力学性能最佳,抗拉强度为1076 MPa,强塑积达到26254.4 MPa·%。

关键词：含Cu低碳钢 I&Q&P工艺配分时间力学性能残余奥氏体

Operation Risk Analysis of Electric Vehicle With Ultra-fast Charging Integrated to Distribution Network Considering the Bearing Capacity of Power System

在线全文

学校读者我要写书评

暂无评论

Dianwang Jishu/Power System Technology 2025年第1期49卷 187-197页

作者： Xu, Yanchun Li, Sijia Zhang, Tao mi, Lu Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station China Three Gorges University Hubei Province Yichang 443002 China Department of Electrical and Computer Engineering Texas A & M University TX 77840 United States

At present, the access of distributed generation and electric vehicles with ultra-fast charging to the distribution network will increase the operational risk of the system. Aiming at the problem that the existing risk assessment indicators fail to consider the system capacity effectively, this paper proposed a comprehensive index of risk assessment of distribution networks considering the power system's capacity. The distributed generation output model and the electric vehicle load model with ultra-fast charging were first constructed. Then, the index based on the distribution entropy theory was used to measure the risk caused by the over-limit of state variables such as voltage and power and the uncertainty of their distribution. The index based on the Theil entropy theory was introduced to measure the risk caused by the equilibrium degree of the incremental distribution of state variables after the load impacted the system. The weight analysis method combining the order relationship method and the objective weighting method was used to evaluate the system risk comprehensively. Finally, the rationality of the comprehensive index was calculated and analyzed by testing the IEEE 33-node system. The results show that the comprehensive index proposed can effectively evaluate the potential risk when the system does not exceed the limit and consider that the ultra-fast charging of electric vehicles will change the time series distribution characteristics of comprehensive risk. The research in this paper can provide theoretical guidance for the safe operation of electric vehicles. with ultra-fast charging connected to the distribution network. © 2025 Power System Technology Press. All rights reserved.

关键词： Risk analysis

Additive neurorestorative effects of exercise and docosahexaenoic acid intake in a mouse model of Parkinson’s disease

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 574-586页

作者： Olivier Kerdiles Méryl-Farelle Oye mintsa mi-mba Katherine Coulombe Cyntia Tremblay VincentÉmond Martine Saint-Pierre Clémence Rouxel Line Berthiaume Pierre Julien Francesca Cicchetti Frédéric Calon Facultéde pharmacie UniversitéLaval1050 Avenue de la MédecineQuebecQCCanada Axe Neuroscience Centre de recherche du CHU de Québec-UniversitéLaval(Pavillon CHUL)2705 Boulevard LaurierQuebecQCCanada Institute of Nutrition and Functional Foods QuebecQCCanada Optinutribrain International Associated Laboratory(NutriNeuro FranceINAFCanada)QuebecQCCanada Axe Endocrinologie et Néphrologie Centre de recherche du CHU de Québec-UniversitéLavalQuebecQCCanada Département de Médecine Facultéde MédecineUniversitéLavalQuebecQCCanada Département de Psychiatrie et Neurosciences Facultéde MédecineQuebecQCCanada

There is a need to develop interventions to slow or reverse the degeneration of dopamine neurons in Parkinson’s disease after *** that preclinical and clinical studies suggest benefits of dietary n-3 polyunsaturated fatty acids,such as docosahexaenoic acid,and exercise in Parkinson’s disease,we investigated whether both could synergistically interact to induce recovery of the dopaminergic ***,mice received a unilateral stereotactic injection of 6-hydroxydopamine into the striatum to establish an animal model of nigrostriatal *** weeks after lesion,animals were fed a docosahexaenoic acid-enriched or a control diet for the next 8 *** this period,the animals had access to a running wheel,which they could use or *** acid treatment,voluntary exercise,or the combination of both had no effect on(i)distance traveled in the open field test,(ii)the percentage of contraversive rotations in the apomorphine-induction test or(iii)the number of tyrosine-hydroxylase-positive cells in the substantia nigra pars ***,the docosahexaenoic acid diet increased the number of tyrosine-hydroxylase-positive terminals and induced a rise in dopamine concentrations in the lesioned *** to docosahexaenoic acid treatment or exercise alone,the combination of docosahexaenoic acid and exercise(i)improved forelimb balance in the stepping test,(ii)decreased the striatal DOPAC/dopamine ratio and(iii)led to increased dopamine transporter levels in the lesioned *** present results suggest that the combination of exercise and docosahexaenoic acid may act synergistically in the striatum of mice with a unilateral lesion of the dopaminergic system and provide support for clinical trials combining nutrition and physical exercise in the treatment of Parkinson’s disease.

关键词： 6-hydroxydopamine dopamine dopamine transporter exercise neurorestoration Parkinson’s disease polyunsaturated fatty acids omega-3