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Effect of matrix structure on mechanical properties and dry rolling-sliding wear performance of alloyed ductile iron

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Journal of Iron and Steel Research International 2019年第8期26卷 888-897页

作者： Hua Zhang Yan-xin Wu qiu-ju li Xin Hong State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy and School of Materials Science and Engineering Shanghai University Shanghai 200072 China Jiangsu Yonggang Group Co. Ltd. Zhangjiagang 215628 Jiangsu China Institute of Engineering Technology University of Science and Technology Beijing Beijing 100083 China

The influence of matrix structure on mechanical properties and dry rolling-sliding wear performance of alloyed ductile iron was examined. Four kinds of alloyed ductile irons with different matrix structures were produced through an adequate balance of alloying elements. Tensile tests and dry rolling-sliding wear tests were carried out at room temperature. The results show that yield strength and ultimate tensile strength increase, while elongation decreases until the matrix fully becomes pearlite. The lower matrix hardness results in more graphite emerging on the contact surface, which yields the decrease in friction coefficient. Besides, the wear rate decreases with the increase in matrix hardness among alloyed ductile irons except that with full pearlite matrix, the wear performance of which seems to be deteriorated due to poor fracture toughness. The main wear mechanism is delamination under an air-cooling condition. Based on the results of mechanical and wear tests, ductile iron with about 80% pearlite exhibits better wear performance as well as relatively reasonable mechanical properties.

关键词： Ductile iron Microstructure Mechanical property Wear Delamination

Localization effect in single crystal of RuAs_(2)

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Chinese Physics B 2024年第4期33卷 195-200页

作者：易哲铠刘琪光双魁徐升岳小宇梁慧李娜周颖吴丹丹孙燕李秋菊程鹏夏天龙孙学峰王义炎 Anhui Key Laboratory of Magnetic Functional Materials and Devices Institute of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Department of Physics and Key Laboratory of Strongly-Coupled Quantum Matter Physics University of Science and Technology of ChinaHefei 230026China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China School of Optical and Electronic Information Suzhou City UniversitySuzhou 215104China School of Physics and Optoelectronic Engineering Anhui UniversityHefei 230601China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

We report the magnetotransport and thermal properties of RuAs_(2) single ***_(2) exhibits semiconductor behavior and localization *** crossover from normal state to diffusive transport in the weak localization(WL)state and then to variable range hopping(VRH)transport in the strong localization state has been *** transitions can be reflected in the measurement of resistivity and Seebeck *** magnetoresistance(NMR)emerges with the appearance of localization effect and is gradually suppressed in high magnetic *** temperature dependent phase coherence length extracted from the fittings of NMR also indicates the transition from WL to *** measurement of Hall effect reveals an anomaly of temperature dependent carrier concentration caused by localization *** findings show that RuAs_(2) is a suitable platform to study the localized state.

关键词： weak localization variable range hopping RuAs_(2) single crystal

Pharmacokinetics Applications of Traditional Chinese Medicines

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World Journal of Traditional Chinese Medicine 2016年第1期2卷 42-47页

作者： qiu-ju li Ai-Hua Zhang Hui Sun Xi-jun Wang National TCM Key Lab of Serum Pharmacochemistry Key Laboratory of Metabolomics and Chinmedomics Department of Pharmaceutical AnalysisHeilongjiang University of Chinese Medicine

Traditional Chinese medicine(TCM) has been widely used in many oriental countries for thousands of years and played an indispensable role in the prevention and treatment of diseases, especially the complicated and chronic ones. It is a very complex mixture containing hundreds or thousands of different components. Pharmacokinetic study on active constituents in TCM preparations is a good way for us to explain and predict a variety of events related to the efficacy and toxicity of TCM. In the drug discovery phases, pharmacokinetics is a key to guide medicinal chemists in the optimization process of a chemical series and to assist pharmacologists to design in vivo *** explore the potentially bioactive components in TCM, it is necessary to further study the in vivo pharmacokinetic characteristics of multiple absorbed components and find out the optical time-course behavior to providing more substantial research for new leads in drug discovery. Pharmacokinetics screening method could provide a reliable means of prospecting natural products in the search for new leads in drug discovery. This review summarizes the research progress of PK on TCM in the search for suitable lead compounds in recent years.

关键词： Traditional Chinese medicine Pharmacokinetics Drug discovery Active constituents

Quantum Chemistry Study on Local Structure and Properties of Amorphous Fe80P20 Alloy

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Chinese Journal of Chemical Physics 2006年第1期19卷 59-64页

作者： Zhi-gang Fang Hong-zhi Hu Jing-xue Guo qiu-ju li School of Chemical Engineering Anshan University ot： Science and Technology Anshan 114044 China

According to the structure features of Fe80P20, A series of clusters Fe4P were designed and focused on studying the stability of local structure, charge distribution and chemical bond, Using the DFT method, energy and structure of Fe4P clusters were optimized and analyzed. The computational results showed that the energy of cluster 1（2） has the lowest energy, and the possibility of its existence in the Fe80P20 is high. Analyzing the transition states among the clusters, it was found that the clusters in the doublet state are more stable than those in the quartet state. The numbers of the Fe-P bond in the clusters play important roles in the cluster stability and electrons transfer properties, The more numbers of Fe-P bonds in the clusters, the higher the cluster stability, and the weaker the ability of P atom to get electron, The number of Fe atoms, which has bonding interactions with the P atom, is direct proportional to the average 3d orbit population of Fe atom. Basing on the orbital population, average magnetic moments of each Fe atom in the Fe4P clusters were calculated, and they are all smaller than that of single metal Fe atom. This suggests that all Fe4P clusters have soft magnetic property and they are expected to be perfect material for preparing soft magnetic apparatus.

关键词： Amorphous Fe80P20 alloy Local structure DFT Cluster

Evolving Molecular Genetics of Glioblastoma

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Chinese Medical Journal 2016年第4期129卷 464-471页

作者： qiu-ju li Jin-Quan Cai Cheng-Yin liu Neurological Consultation Center VIP Clinic Beijing Tian Tan Hospital Capital Medical University Beijing 100050 China Department of Neurosurgery The Second Affiliated Hospital of Harbin Medical University Harbin Heilongjiang 150001 China Department of Molecular Neuropathology Beijing Neurosurgical Institute Beijing 100050 China

Objective： To summary the recent advances in molecular research of glioblastoma （GBM） and current trends in personalized therapy of this *** Sources： Data cited in this review were obtained mainly from PubMed in English up to 2015, with keywords ＆quot;molecular＆quot;, ＆quot;genetics＆quot;, ＆quot;GBM＆quot;, ＆quot;isocitrate dehydrogenase＆quot;, ＆quot;telomerase reverse transcriptase＆quot;, ＆quot;epidermal growth factor receptor＆quot;, ＆quot;PTPRZ1-MET＆quot;, and ＆quot;clinical treatment＆quot;.Study Selection： Articles regarding the morphological pathology of GBM, the epidemiology of GBM, genetic alteration of GBM, and the development of treatment for GBM patients were identified, retrieved, and ***： There is a large amount of data supporting the view that these recurrent genetic aberrations occur in a specific context of cellular origin, co-oncogenic hits and are present in distinct patient *** and secondary GBMs are distinct disease entities that affect different age groups of patients and develop through distinct genetic *** differences are important, especially because they may affect sensitivity to radio-and chemo-therapy and should thus be considered in the identification of targets for novel therapeutic ***： This review highlights the molecular and genetic alterations of GBM, indicating that they are of potential value in the diagnosis and treatment for patients with GBM.

关键词： Epidermal Growth Factor Receptor Genetics Glioblastomas lsocitrate Dehydrogenase Molecular: PTPRZ1-MET Telomerase Reverse Transcriptase

Pharmacological Effects of Botanical Drugs on Myocardial Metabolism in Chronic Heart Failure

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Chinese Journal of Integrative Medicine 2024年第5期30卷 458-467页

作者： HU Yu-xuan qiu Sheng-lei SHANG ju-ju WANG Zi LAI Xiao-lei Beijing Hospital of Traditional Chinese Medicine Capital Medical UniversityBeijing 100010China

Although there have been significant advances in the treatment of heart failure in recent years,chronic heart failure remains a leading cause of cardiovascular disease-related *** studies have found that targeted cardiac metabolic remodeling has good potential for the treatment of heart ***,most of the drugs that increase cardiac energy are still in the theoretical or testing *** research has found that botanical drugs not only increase myocardial energy metabolism through multiple targets but also have the potential to restore the balance of myocardial substrate *** this review,we summarized the mechanisms by which botanical drugs(the active ingredients/formulas/Chinese patent medicines)improve substrate utilization and promote myocardial energy metabolism by activating AMP-activated protein kinase(AMPK),peroxisome proliferator-activated receptors(PPARs)and other related *** the same time,some potential protective effects of botanical drugs on myocardium,such as alleviating oxidative stress and dysbiosis signaling,caused by metabolic disorders,were briefly discussed.

关键词： botanical drugs chronic heart failure myocardial metabolism pharmacological effects review

The First Five Years of a Phase Theory for Complex Systems and Networks

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IEEE/CAA Journal of Automatica Sinica 2024年第8期11卷 1728-1743页

作者： Dan Wang Wei Chen li qiu Division of Decision and Control Systems KTH Royal Institute of TechnologyStockholm 10044Sweden Department of Mechanics and Engineering Science&the State Key Laboratory for Turbulence and Complex Systems Peking UniversityBeijing 100871China Hong Kong University of Science and Technology Hong KongChinaand also with the Southern University of Science and TechnologyShenzhen 518055China

In this paper,we review the development of a phase theory for systems and networks in its first five years,represented by a trilogy:Matrix phases and their properties;The MIMO LTI system phase response,its physical interpretations,the small phase theorem,and the sectored real lemma;The synchronization of a multi-agent network using phase *** the end,we also summarize a list of ongoing research on the phase theory and speculate what will happen in the next five years.

关键词： Consensus and synchronization matrix phases multi-agent systems phase theory sectored real lemma small phase theorem.

Synthetic Control of Thorium Metal-Organic Frameworks for Sequencing and Sensing of Radioiodine Species

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Chinese Journal of Chemistry 2024年第1期42卷 20-28,I0004页

作者： Yu ju Zi-Jian li xue Wang Jie qiu Yiuhon Chan Zhi-Hui Zhang Mingyang He Jian lin Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology Changzhou UniversityNo.21Gehu Middle RoadChangzhouJiangsu 213164China Schoolof Nuclear Science and Technology Xi'an Jiaotong UniversityNo.28West Xianning RoadXianShaanxi 710049China Key Laboratoryof Interfacial Physics and Technology Shanghai Institute of Applied PhysicsChinese Academy of Sciences2019JiaLuoRoadShanghai 201800China

Exploring the physiochemical properties and expanding the applications of actinide-containing materials is paramount to address the escalating challenge of radioactive waste ***,unlocking the full potential of these materials is largely crippled by the radiotoxicity of the *** report here two porous and luminescent thorium-based metal-organic frameworks(Th-BITD-1 and Th-BITD-2)that serve as a bifunctional platform for sequencing and sensing of radioiodine,a much more radioactive fission product discharged during the nuclear fuel *** particular,Th-BITD-1 displays better iodine uptake performance than Th-BITD-2 via the solution-based process and vapor diffusion with the maximum adsorption capacities of 831 and 1099 mg/g,*** thermore,Th-BITD-1 can function as a highly sensitive luminescence sensor for iodate with a quenching constant(Ksv)of 6.6(5)×10^(3) M^(-1)and a detection limit of 2.02μM,respectively,outperforming 2.96(6)×10^(3)M^(-1)and 10.5μM of ***,a positive correlation between the sensing efficacy and the iodate adsorption capacity has been *** work highlights the opportunity in designing novel actinide-based MOFs for their potential applications in radiological fields,e.g.,radionuclide separation and detection.

关键词： Thorium Metal-organic frameworks Adsorption Detection lodine Actinides Radiochemistry Luminescence

Constraining the Earth-mass Primordial Black Hole Mergers Model of the Non-repeating FRBs Using the First CHIME/FRB Catalog

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Research in Astronomy and Astrophysics 2024年第9期24卷 76-82页

作者： Min Meng qiu-ju Huang Can-Min Deng Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China

In this paper,we upgrade the constraints for the Earth-mass primordial black hole mergers model based on the first Canadian Hydrogen Intensity Mapping Experiment(CHIME)/fast radio burst(FRB)*** the null hypothesis that the observed non-repeating FRBs originate from Earth-mass primordial black hole mergers,we find that how the charges were distributed in the primordial black hole population is well described by a double powerlaw function with typical charge value of law function with typical charge value of q_(c)/10^(-5)=1.60_(-0.28)^(+0.28),where the power-law index α_(1)=2.33_(-0.18)^(+0.15) for q

关键词： black hole physics (stars:)gamma ray burst:general (cosmology:)dark matter