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A New Resource-Saving,High Chromium and Manganese Super Duplex Stainless Steels 29Cr-12Mn-2Ni-1Mo-xN

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Journal of Iron and Steel Research International 2011年第9期18卷 41-46页

作者： MA Zheng-huan zhao xiang-juan GE Chang-sheng DING Tie-suo LI Jun XIAO Xue-shan Institute of Materials Shanghai University Shanghai 200072 China Jiangsu Josen Special Steel Products Co Ltd Xinghua 225721 Jiangsu China

A new family of resource saving, high chromium and manganese super duplex stainless steels （DSSs）, with a composition in mass percent, % of Cr 0.29, Mn 0.12, Ni 2.0, Mo i. 0, and N 0. 51-0. 68, has been developed by examining the effect of N on the microstructure, mechanical properties and corrosion properties. The results show that these alloys have a balanced ferrite-austenite relation. The austenite volume fraction decreases with the solution treatment temperature, but it increases with an increase in N content. The increases in nitrogen enhance the ultimate tensile strength （UTS） and reduce the ductility of the material slightly. The pitting corrosion potential increases first and then decreases with an increase in nitrogen content when the amount of N arrives to 0.68%. The yield stress and ultimate tensile strength of solution treated samples were more than 680 and 900 MPa, the elongation of experimental alloys are higher than 30%, respectively, what is more, the pitting potentials were beyond 1 100 mV.

关键词： duplex stainless steel microstructure mechanical property pitting potential

22Cr High-Mn-N Low-Ni Economical Duplex Stainless Steels

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Journal of Iron and Steel Research International 2012年第2期19卷 50-56页

作者： JIANG Da-wei GE Chang-sheng zhao xiang-juan LI Jun SHI Lu-lu XIAO Xue-shan Institute of Materials Shanghai University Shanghai 200072 China Jiangsu JosenSpecial Steel Products Co Ltd Xinghua 225721 Jiangsu China

A new family of economical duplex stainless steels in which N or Mn was substituted for Ni with composi- tion of 22Cr-8.0Mn-xNi-1.0Mo-0.7Cu-0.7W-0.3N （x = 0.5 -- 2.0） have been developed by examining the micro- structure, mechanical and corrosion properties of these alloys. The results show that these alloys have a balanced ferrite-austenite relation. In addition, the alloys are free of precipitation of sigma phase and Cr-nitride when solution- treated at 750 to 1300℃ for 30 min. The yield strength, tensile strength and fracture elongation values of experi- mental alloys solution-treated at 1050 ℃ for 30 min are about 500, 750 MPa and 40.0%, respectively. Low-temper- ature impact properties can be improved distinctly with the increase of nickel content. Among the designed DSS al- loys, the alloy with Ni of 2.0% is found to be an optimum alloy with proper phase proportion, better low-tempera- ture impact properties and higher pitting corrosion resistance compared with those o~ other alloys. The mechanical and corrosion properties and lower production cost of the designed DSSs are better than those of AISI 304.

关键词： economical duplex stainless steel low-temperature impact property pitting corrosion resistance

Biomimetic Gland Models with Engineered Stratagems

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Research 2024年第2期2023卷 583-612页

作者： xiang Lin Lingyu Sun Minhui Lu Yuanjin zhao Department of Rheumatology and Immunology Nanjng Drum Tower HospitalSchool of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096China Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhouZhejiang 325001China Southeast University Shenzhen Research Institute Shenzhen 518071China

As extensively distributed tissues throughout the human body,glands play a critical role in various physiological ***,the construction of biomimetic gland models in vitro has aroused great interest in multiple *** the biological field,the researchers focus on optimizing the cell sources and culture techniques to reconstruct the specific structures and functions of glands,such as the emergence of organoid *** the perspective of biomedical engineering,the generation of biomimetic gland models depends on the combination of engineered scaffolds and microfluidics,to mimic the in vivo environment of glandular *** engineered stratagems endowed gland models with more biomimetic features,as well as a wide range of application *** this review,we first describe the biomimetic strategies for constructing different in vitro gland models,focusing on the role of microfluidics in promoting the structure and function development of biomimetic *** summarizing several common in vitro models of endocrine and exocrine glands,the applications of gland models in disease modelling,drug screening,regenerative medicine,and personalized medicine are ***,we conclude the current challenges and our perspective of these biomimetic gland models.

关键词： endowed constructing strata

Reduction of unactivated alkyl chlorides enabled by light-induced single electron transfer

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Science China Chemistry 2024年第2期67卷 471-481页

作者： Lei Dai zhao-Fei Zhang xiang-Yu Chen School of Chemical Sciences University of the Chinese Academy of SciencesBeijing100049China Institute of Chemistry Chinese Academy of SciencesBeijing100190China Binzhou Institute of Technology Weiqiao-UCAS Science and Technology ParkBinzhou256606China

Alkyl chlorides are abundant and easily accessible starting ***,due to the high reduction potentials associated with unactivated alkyl chlorides,achieving their single electron reduction remains a persistent *** challenge has spurred the exploration of efficient activation methods to overcome this *** recent years,photocatalysis has emerged as a mild and potent tool for the single electron reduction of unactivated alkyl chlorides,opening up new possibilities in this *** the rapid advancements in this area,a comprehensive review that provides a conceptual understanding of this emerging field,with a specific focus on reaction design and catalytic mechanisms,would be timely and highly ***,we present an overview of various synthetic techniques for photoinduced single electron reduction of unactivated alkyl ***,we also discuss the limitations of the present methods and future directions that lie ahead in this field.

关键词： photocatalysis unactivated alkyl chlorides single electron transfer radical reactions

Flexible electrochemical capacitor based NiMoSSe electrode material with superior cycling and structural stability

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Chinese Chemical Letters 2024年第7期35卷 456-460页

作者： Jingxuan Liu Shiqi zhao xiang Wu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

Constructing composited electrode material is considered to be an efficient strategy to improve their electrochemical *** can accelerate the charge transfer speed of ions and enhance the conductivity of ***,the formation of the hybrid structure can largely avoid the aggregation of two dimensional materials and increase the electrochemical active area of the *** this work,we synthesize NiMoSSe electrode materials on nickel foam by a facile hydrothermal *** prepared composite shows a specific capacitance of 1035 C/g at 1 A/g due to the synergistic effect between MoS_(2) and MoSe_(2) *** addition,the devices are assembled with NiMoSSe samples,which offers an energy density of 82.71 Wh/kg at a power density of 2700 W/kg.

关键词： Supercapacitors NiMoSSe Energy density Power density Cycling life

Versatile strategies for adult neurogenesis:avenues to repair the injured brain

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Neural Regeneration Research 2024年第4期19卷 774-780页

作者： Junyi zhao Siyu Liu Xianyuan xiang Xinzhou Zhu The Brain Cognition and Brain Disease Institute(BCBDI) Shenzhen Institute of Advanced TechnologyChinese Academy of Sciences Faculty of Life and Health Sciences Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences Shenzhen-Hong Kong Institute of Brain Science-Shenzhen Fundamental Research Institutions

Brain injuries due to trauma or stroke are major causes of adult death and ***,few interventions are effective for post-injury repair of brain *** a long debate on whether endogenous neurogenesis actually happens in the adult human brain,there is now substantial evidence to support its *** neurogenesis is usually significantly stimulated by injury,the reparative potential of endogenous differentiation from neural stem/progenitor cells is usually ***,exogenous stem cell transplantation has shown promising results in animal models,but limitations such as poor long-term survival and inefficient neuronal differentiation make it still challenging for clinical ***,a high focus was placed on glia-to-neuron conversion under single-factor *** some inspiring results,the validity of this strategy is still *** this review,we summarize historical findings and recent advances on neurogenesis strategies for neurorepair after brain *** also discuss their advantages and drawbacks,as to provide a comprehensive account of their potentials for further studies.

关键词： adult neurogenesis glia-to-neuron conversion ischemic stroke neurogenic niche neuroinflammation stem cell transplantation traumatic brain injury

Dynamic response of water-rich tunnel subjected to plane P wave considering excavation induced damage zone

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Underground Space 2024年第2期15卷 113-130页

作者： Gongliang xiang Ming Tao Rui zhao Huatao zhao Muhammad Burhan Memon Chengqing Wu School of Resources and Safety Engineering Central South UniversityChangsha 410083China School of Geoscience and Technology Southwest Petroleum UniversityChengdu 610500China School of Civil and Environmental Engineering University of Technology SydneyNSW 2007Australia

The stability analysis of a deep buried tunnel subjected to dynamic disturbance is an important *** this study,the transient response has been obtained by establishing a water-rich tunnel model considering excavation damage zone(EDZ).Based on Biot’s two-phase dynamic theory and wave function expansion method,the analytical solution of dynamic response around the water-rich tunnel containing EDZ subjected to P wave is ***,Fourier transform and Duhamel’s integral technique is introduced to calculate the transient response,and the equivalent blasting curve is adopted to input excitation *** dimensionless parameters thickness N and shear modulus ratio lare defined to characterize the degree of damage in the surrounding rock,investigating the influencing factors,such as the parameters and the incident source *** results indicate that the dynamic stress concentration factor(DSCF)gradually decreases as the dimensionless parameters ***,it is observed that the DSCF is more sensitive to changes in the thickness parameter ***,the influence of the waveform parameters has been taken into account in the analysis of transient response,and the stress state and transfer process in each time stage of the EDZ are *** study establishes a theoretical foundation for comprehending the mechanical behavior and support design considerations associated with a deep-buried water-rich tunnel containing EDZ.

关键词： Water-rich tunnel Two-phase dynamic theory Wave scattering Transient response Dynamic stress concentration

Who should be screened for colorectal cancer and how can it be prevented more effectively?

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World Journal of Gastrointestinal Oncology 2024年第9期16卷 3741-3746页

作者： You-xiang Wang Kai-juan Wang College of Public Health Zhengzhou UniversityZhengzhou 450001Henan ProvinceChina College of Public Health Key Laboratory of Tumor Epidemiology of Henan ProvinceState Key Laboratory of Esophageal Cancer Prevention&TreatmentZhengzhou UniversityZhengzhou 450001Henan ProvinceChina

In this editorial,we comment on the article published by Agatsuma et al in a recent issue of the World J Gastroenterol(2024;30:1368-1376).We firmly concur with Agatsuma et al regarding the vital significance of colorectal cancer(CRC)screening as a public health strategy to diminish disease *** exposed to risk factors for CRC,those with comorbid conditions,and those with limited health literacy should undergo ***,we believe that more regular screenings should be accompanied by a greater focus on primary prevention(PP)of *** remains a significant global health challenge,and its incidence is strongly linked to age,lifestyle,and socioeconomic *** is particularly noteworthy that the majority of CRC patients are diagnosed outside of established screening pathways and frequently at an advanced stage of the disease,and the majority of patients possess inadequate or even nonexistent knowledge regarding CRC,which significantly impacts the prognosis and imposes a substantial economic *** study revealed that CRC identified during hospital visits for comorbid conditions was typically diagnosed at an earlier stage than detected via symptomatic ***,early incidental detection of CRC aligns closely with the timing of discovery through routine cancer *** suggests that by adopting more inclusive screening protocols that combine opportunistic testing with traditional screening methods,health care systems can create a more comprehensive safety net for individuals at risk of ***,before maximizing the health benefits of screening programs,it is essential to make additional efforts prior to screening,such as raising awareness via public education,risk assessment,and personalized recommendations,enhancing the knowledge and skills of health care professionals,optimizing the accessibility and convenience of screening processes,ensuring the quality and safety of screening services,strengthening follow-up and su

关键词： Colorectal cancer Primary prevention Screening program Disease burden Health literacy Economic benefits

Prediction of undeformed chip thickness distribution and surface roughness in ultrasonic vibration grinding of inner hole of bearings

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第4期25卷 311-323页

作者： Yanqin LI Daohui xiang Guofu GAO Feng JIAO Bo zhao School of Mechanical and Power Engineering Henan Polytechnic UniversityJiaozuo 454000China

Ultrasonic vibration grinding differs from traditional grinding in terms of its material removal *** randomness of grain-workpiece interaction in ultrasonic vibration grinding can produce variable chips and impact the surface roughness of ***,previous studies used iterative method to calculate the unformed chip thickness(UCT),which has low computational *** this study,a symbolic difference method is proposed to calculate the *** UCT distributions are obtained to describe the stochastic interaction characteristics of ultrasonic grinding ***,the UCT distribution characteristics under different machining parameters are ***,a surface roughness prediction model is established based on the UCT ***,the correctness of the model is verified by *** study provides a quick and accurate method for predicting surface roughness in longitudinal ultrasonic vibration grinding.

关键词： Ultrasonic vibration grinding Undeformed chip thickness(UCT) Distribution characteristics Surface roughness