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Recycling arsenic-containing bio-leaching residue after thermal treatment in cemented paste backfill:Structure modification,binder properties and environmental assessment

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2136-2147页

作者： Dengfeng Zhao shiyu zhang Yingliang Zhao Department of Mining Engineering Lyuliang UniversityLvliang 033000China School of Civil and Environmental Engineering University of Science and Technology BeijingBeijing 100083China School of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 00852China

The substantial arsenic(As)content present in arsenic-containing bio-leaching residue(ABR)presents noteworthy environ-mental challenges attributable to its inherent instability and susceptibility to *** its elevated calcium sulfate content,ABR exhibits considerable promise for industrial *** study delved into the feasibility of utilizing ABR as a source of sulfates for producing super sulfated cement(SSC),offering an innovative binder for cemented paste backfill(CPB).Thermal treatment at varying temperatures of 150,350,600,and 800℃ was employed to modify ABR’s *** investigation encompassed the examination of phase transformations and alterations in the chemical composition of As within ***,the hydration characteristics of SSC utilizing ABR,with or without thermal treatment,were studied,encompassing reaction kinetics,setting time,strength development,and *** findings revealed that thermal treatment changed the calcium sulfate structure in ABR,consequently impacting the resultant sample ***,calcination at 600℃ demonstrated optimal modification effects on both early and long-term strength *** enhanced performance can be attributed to the augmented formation of reaction products and a densified ***,the thermal treatment elicited modifications in the chemical As fractions within ABR,with limited impact on the As immobilization capacity of the prepared binders.

关键词： cemented paste backfill bio-leaching residue arsenic immobilization binder hydration calcination

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Geometry effect on water-evaporation-induced voltage in porous carbon black film

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Science China(Technological Sciences) 2021年第3期64卷 629-634页

作者： zhang shiyu FANG SunMiao LI LuXian GUO WanLin State Key Laboratory of Mechanics and Control of Mechanical Structures Key Laboratory of Intelligent Nano Materials and Devices of the Ministry of EducationInstitute of Nano ScienceNanjing University of Aeronautics and AstronauticsNanjing 210016China

Water-evaporation-induced electricity generation shows great application prospect due to the volt-level voltage induced by natural water evaporation in ambient *** investigations have been conducted on water-evaporation-induced electricity in different materials,surface treatments,working mechanisms and wide ranges of practical ***,to further enhance the electricity output remains a great *** this study,we fabricated porous carbon black films with isosceles trapezoid shapes to generate water-evaporation-induced electricity,in contrast with the widely used rectangle *** found that an isosceles trapezoid film produces two different voltages by inversing the film,because of different flow rates and capillary heights after *** ratio of these voltages varies with the length of longer base when lengths of shorter base and heights are fixed,and the maximum ratio can reach 1.77:1 in our *** work shows the importance of geometry design in improving the output voltage.

关键词： water-evaporation-induced voltage porous carbon black film geometry hydrovoltaic technology

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Angle measurement technology based on magnetization vector for narrow space applications

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Nanotechnology and Precision Engineering 2020年第3期3卷 167-173页

作者： Yinguo Huang shiyu zhang Le Gao Yelong Zheng State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin 300072China Science and Technology on Rotorcraft Aeromechanics Laboratory China Helicopter Research and Development InstituteJingdezhen 333001China

With the wide application of laser in the field of skin plastic surgery, micro laser galvanometer scanner has made great progress in this field with its portability. However, the measurement method used to measure the deflection angle of laser galvanometer in the narrow space of scanner with high precision remains to be studied. In this paper, an angle measurement method based on magnetic field is proposed, and the effect of the shapes of permanent magnets(PMs) on the measurement is studied by theoretical and experimental study under the condition that the maximum available space for the PMs is a 10 mm side cube. An angle measuring experimental device is set up, and the contrast experiment is carried out with different PMs which are the same as simulation. The experimental results show that cylindrical PM is more suitable than other PMs, which is consistent with the simulation results, and the maximum nonlinearity error is 0.562%. This method has the advantages of small volume,non-contact measurement, small moment of inertia, good dynamic response and no external excitation for the PMs, so it has a broad application prospect in micro laser galvanometer scanner.

关键词： Micro laser galvanometer scanner Deflection angle Narrow space Shapes of permanent magnets Nonlinearity error

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Predicting Acute Mountain Sickness Using Regional Sea-Level Cerebral Blood Flow

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Biomedical and Environmental Sciences 2024年第8期37卷 887-896页

作者： Hao zhang Jie Feng shiyu zhang Wenjia Liu Lin Ma Chinese PLA Medical School Beijing 100853China Department of Radiology First Medical CenterChinese PLA General HospitalBeijing 100853China Department of Radiology Beijing Friendship HospitalCapital Medical UniversityBeijing 100050China

Objective To investigate the role of sea-level cerebral blood flow(CBF)in predicting acute mountain sickness(AMS)using three-dimensional pseudo-continuous arterial spin labeling(3D-pCASL).Methods Forty-eight healthy volunteers reached an altitude of 3,650 m by air after undergoing a head magnetic resonance imaging(MRI)including 3D-pCASL at sea *** CBF values of the bilateral anterior cerebral artery(ACA),middle cerebral artery(MCA),posterior cerebral artery(PCA),and posterior inferior cerebellar artery(PICA)territories and the laterality index(LI)of CBF were compared between the AMS and non-AMS *** analyses were performed to determine the relationship between CBF and AMS,and the predictive performance was assessed using receiver operating characteristic(ROC)*** The mean cortical CBF in women(81.65±2.69 mL/100 g/min)was higher than that in men(74.35±2.12 mL/100 g/min)(P<0.05).In men,the cortical CBF values in the bilateral ACA,PCA,PICA,and right MCA were higher in patients with AMS than in those *** CBF in the right PCA best predicted AMS(AUC=0.818).In women,the LI of CBF in the ACA was different between the AMS and non-AMS groups and predicted AMS with an AUC of *** Although the mechanism and prediction of AMS are quite complicated,higher cortical CBF at sea level,especially the CBF of the posterior circulatory system,may be used for prediction in male volunteers using non-invasive 3D-pCASL.

关键词： Acute mountain sickness High-altitude headache Cerebral blood flow Arterial spin labeling Magnetic resonance imaging

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Superhydrophobic fluoride conversion coating on bioresorbable magnesium alloy——fabrication,characterization,degradation and cytocompatibility with BMSCs

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Journal of Magnesium and Alloys 2021年第4期9卷 1252-1266页

作者： Chunyan zhanga shiyu zhang Dongwei Sun Jiajia Lin Fancheng Meng Huinan Liu School of Materials Science&Engineering Chongqing University of TechnologyNo.69 Hongguang AvenueChongqing 400054China Department of Bioengineering and the Materials Science and Engineering ProgramUniversity of CaliforniaRiverside900 University AvenueMSE 205RiversideCA 92521USA

A micro-nano structure CaF_(2)chemical conversion layer was prepared on fluoride-treated AZ31 alloy,then the composite fluoride conversion film(CaF_(2)/MgF_(2))was modified by stearic acid(SA)and fabricated a superhydrophobic *** fluoride-treated magnesium,fluoride conversion film and superhydrophobic coating were characterized by SEM,EDS,XRD and *** properties of coatings1 adhesion and corrosion resistance were evaluated via tape test and electrochemical *** cytocompatibility of the MgF_(2),CaF_(2)and superhydrophobic CaF_(2)/SA surface was investigated with bone marrow-derived mesenchymal stem cells(BMSCs)by direct culture for 24 *** results showed that the superhydrophobic fluoride conversion coating composed of inner MgF_(2)layer and the outer CaF_(2)/SA composite layer had an average water contact angle of 152°.SA infiltrated into the micro-nano structure CaF_(2)layer and formed a strong adhesion with CaF_(2)***,the super-hydrophobic coating showed higher barrier properties and corrosion resistance compared with the fluoride conversion film and fluoride-treated AZ31 *** BMSC adhesion test results demonstrated MgF_(2)CaF_(2)and CaF_(2)/SA coatings were all nontoxic to *** the condition of in direct contact with cells,MgF_(2)showed higher cell density and enhanced the BMSCs proliferation,while CaF_(2)and CaF_(2)/SA coating showed no statistically difference in cell density compared with glass reference but the CaF_(2)and CaF_(2)/SA coating were not conducive to BMSCs adhesion.

关键词： Biodegradable Magnesium alloy Superhydrophobic Fluoride conversion film Cytocompatibility

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Using boosting tree to learn imbalanced data

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The Journal of China Universities of Posts and Telecommunications 2019年第2期26卷 43-51,81页

作者： Yang Ridong zhang shiyu Li Lin Wang Zhe Zhou Yi Zhongshan School of Medicine Sun Yat-Sen UniversityGuangdong 510080China College of Public Health Xinjiang Medical UniversityXinjiang 830001China

In case of machine learning,the problem of class imbalance is always troubling,*** class of the samples has a larger magnitude than the other *** problem brings a preference of the classifier to the majority class,which leads to worse performance of the classifier on the minority *** proposed an improved boosting tree(BT) algorithm for learning imbalanced data,called cost *** each iteration of the cost BT,only the weights of the misclassified minority class samples are ***,the error rate in the weight formula of the base classifier is replaced by 1 minus *** this study,the performance of the cost BT algorithm is compared with other known methods on 9 public data *** compared methods include the decision tree and random forest algorithm,and both of them were combined with the sampling techniques such as synthetic minority oversampling technique(SMOTE),Borderline-SMOTE,adaptive synthetic sampling approach(ADASYN) and one sided *** cost BT algorithm performed better than the other compared methods in F-measure,G-mean and area under curve(AUC).In 6 of the 9 data sets,the cost BT algorithm has a superior performance to the other published *** can promote the prediction performance of the base classifiers by increasing the proportion of the minority class in the whole samples with only increasing the weights of the misclassified minority class samples in each iteration of the *** addition,computing the weights of the base classifiers with F-measure is helpful to the ensemble decisions.

关键词： machine learning class imbalanced BT data sampling

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GTL or LNG:Which is the best way to monetize "stranded" natural gas?

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Petroleum Science 2008年第4期5卷 388-394页

作者： Dong Lichun Wei Shun＇an Tan shiyu zhang Hongjing School of Chemistry and Chemical Engineering Chongqing University Chongqing 400044 China

A large portion of world＇s natural gas reserves are ＂stranded＂ resources, the drive to monetize these resources leads to the development of gas-to-liquids （GTL） and liquefied natural gas （LNG） technologies. LNG has the advantage of having been developed for the past 40 years and having an excellent safety record. GTL on the other hand is another option with substantial benefits, but its development stage and commercial viability are far behind LNG. This paper presents a techno-economic comparison of GTL with LNG, including technical development, plant efficiency, market potential for the products, and capital cost for the infrastructure. The aim is to give an overall view on both LNG and GTL and provide a perspective on the profitability of these two technologies.

关键词： GTL (gas to liquids) LNG (liquefied natural gas) "stranded" natural gas

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Thermo-mechanical fatigue behavior of nickel-base powder metallurgy superalloy FGH96 under tension-tension loading

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Acta Metallurgica Sinica(English Letters) 2010年第2期23卷 147-153页

作者： Yuli GU Yuhuai HE shiyu QU Guodong zhang Fei ZHENG Chunhu TAO Beijing Institute of Aeronautical Materials Beijing 100095 China

Thermo-mechanical fatigue （TMF） behavior of FGH96, a nickel-base powder metallurgy superalloy, has been studied under tension-tension loading at the temperature range from 550 to 720 ℃. The results show that TMF fracture mode is intergranular for the in-phase （IP）, but transgranular cleavage-like for the out-of-phase （OP） samples. The total content of Al, Ti and Nb in the γ＇ phases for the IP or OP samples and the partitioning ratio of γ＇/γin these elements for the IP samples are relatively higher at the lower strain amplitude, which is consistent with the case of the γ＇ size that is larger at the lower strain amplitude, the lattice parameter misfit is negative and the absolute value is lower at the lower strain amplitude that is correlative with the change of the γ＇ morphology. The deformation at the lower strain amplitude is mainly dominated by the dislocation lines and dislocation pairs in the matrix channels, at the higher strain amplitude dominated by the large numbers of superlattice stacking faults within the γ＇ phases.

关键词： Nickel-base superalloy Thermo-mechanical fatigue Elemental partitioning γ' size Dislocation

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Effects of Bionic Units in Different Scales on the Wear Behavior of Bionic Impregnated Diamond Bits

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Journal of Bionic Engineering 2016年第4期13卷 659-668页

作者： Zhaozhi Wang Ke Gao Youhong Sun Zhihui zhang shiyu zhang Yunhong Liang Xiujuan Li Luquan Ren Key Laboratory of Bionic Engineering (Ministry of Education China) Jilin University Changchun 130022 China College of Biological and Agrieultural Engineering Jilin University Changehun 130022 China College of Construction Engineering Jilin University Changchun 130026 China

Based on anti-wear theory of soil animals, the samples of impregnated diamond bit with bionic self-regenerated non-smooth surface were designed and fabricated. Such a bionic surface was characterized by concave-shape units of different scales that continuously maintained their shape and function during the whole working process. Abrasion tests were carried out to investigate the performance of samples. Results showed that the bionic samples exhibit excellent wear resistance and drilling performance under the action of bionic self-regenerated units, especially those with units of 2 mm - 3 mm diameter. The par- ticle-trapping mechanism coming from the self-regenerated concaves and the lubricating mechanism coming from the con- tinuously self-supplying of solid lubricant are important reasons for reducing or even avoiding the severe abrasions. The im- proved drilling performance of bionic samples derives from, on the one hand, the back edge of bionic unit that contributes to exposing new diamond and supplying additional shear stresses to increase the cutting ability, on the other hand, the enhanced load per unit area due to the decreased contact area at the frictional interface. The relationship between the wear behavior and the scale of bionic unit was revealed. The unit of smaller scale on the bionic samples can enhance the shear stress level. Further reducing the scale to a contain extent will diminish the wear resistance of sample. While increasing the scale can lead to the poor lubricating effect.

关键词： bionic non-smooth surface scale of bionic units impregnated diamond bits wear behavior

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Enhancing thermal conductivity of silicone rubber composites by insitu constructing SiC networks:A finite-element study based on first principles calculation

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Nano Research 2023年第1期16卷 1430-1440页

作者： Dongliang Ding shiyu zhang Haoyu Liang Xu Wang Ya Wu Yuanming Ye Zhenguo Liu Qiuyu zhang Guangzhao Qin Yanhui Chen School of Chemistry and Chemical Engineering Shaanxi Key Laboratory of Macromolecular Science and TechnologyKey Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information TechnologyNorthwestern Polytechnical UniversityXi’an 710072China Shenzhen Research Institute of Northwestern Polytechnical University Shenzhen 518057China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China Queen Mary University of London Engineering School Northwestern Polytechnical UniversityXi’an 710072China Institute of Flexible Electronics Northwestern Polytechnical UniversityXi’an 710072China Ningbo Institute of Northwestern Polytechnical University Ningbo 315103China

Polymer composites as thermal interface materials have been widely used in modern electronic *** this work,we report a novel method to prepare highly through-plane thermally conductive silicone rubber(SR)composites with vertically aligned silicon carbide fibers(VA-SiCFs)entangled by SiC nanowires(SiCNWs)***,a series of carbon fibers(CFs)skeletons were fabricated in sequence of coating poor thermally conductive polyacrylonitrile-based CFs with polydopamine,icetemplated assembly,and freeze-drying ***,VA-SiCFs networks,i.e.,long-range continuous SiCFs-SiCNWs networks,based on the prepared CFs skeletons,were in-situ obtained via template-assisted chemical vapor deposition *** thermal conductivity enhancement mechanism of VA-SiCFs networks on its SR composites was also intensively studied by finite element simulation,based on the first principles investigation of SiC,and Foygel’s *** in-situ grown VA-SiCFs networks possess high intrinsic thermal conductivity without the thermal interface between fillers,acting as the high-efficiency through-plane long-range continuous thermal conduction path,in which the SiCNWs were the in-plane“thermal spreader”.The VA-SiCFs/SR composites reached a high through-plane thermal conductivity,2.13 W/(m·K),at the filler loading of 15 vol.%,which is 868.2%,and 249.2%higher than that of pure SR sample,and random-CFs@polydopamine(PDA)/SR composites at the same content,*** VA-SiCFs/SR composites also exhibited good electrical insulation performance and excellent dimensional stability,which guaranteed the stable interfacial heat transfer of high-power density electronic devices.

关键词： silicon carbide fibers silicon carbide nanowires silicone rubber composites through-plane thermal conductivity first principles

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