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| 1 | Experimental study on hydrodynamic behaviors of high-speed gas jets in still water显示文摘现在的纸在流动模式和水动力学效果上描述试验性的调查在水下从超声、声音的嘴的煤气的喷气操作了在正确 -- 并且有瑕疵的扩大条件。流动可视化证明 jetting 是为以在在考虑下面的参数范围的高速度的沉没煤气的注射的流动政体。获得的结果显示静止的水里的高速度的煤气的喷气在过去膨胀、下面膨胀的喷气导致嘴出口和吃惊房间结构的存在在上游的大压力跳动在导致喷气的水动力学压力的紧张导致增加。 | Zhenqing Dai Boyi Wang Longxi Qi Honghui Shi | 2006 | Acta Mechanica Sinica2006，22，5： | 28 |
| 2 | Thiocyanate-induced labilization of schwertmannite: Impacts and mechanisms显示文摘Schwertmannite is an amorphous iron(III)-oxyhydroxysulfate that forms in acid mine drainage(AMD) environments. The characteristic of high heavy metal adsorption capability makes schwertmannite a potentially useful, environmentally friendly material in wastewater treatment. Unstable schwertmannite is prone to recrystallization.Understanding the mechanisms that induce schwertmannite labilization and affect its capacity to remove heavy metals are of great environmental and geochemical significance.Thiocyanate(SCNˉ) is a hazardous pseudohalide that is also normally found in AMD.However, little is known about the impact of Fe(III)-binding ligand SCNˉ on schwertmannite stability and its subsequent capacity to bind trace elements. Here, we investigated the adsorption of SCNˉ on schwertmannite and subsequent mineral transformation to characterize this little-known process. The appearance of Fe2+indicated that the interactions between schwertmannite and SCNˉ may involve complexation and reduction reactions. Results showed that the majority of the adsorbed-SCNˉ was immobilized on schwertmannite during the 60-days transformation. The transformation rates of schwertmannite increased with increasing concentrations of SCNˉ. Goethite was detected as the dominant transformation product with or without SCNˉ. The mechanisms of SCNˉ-promoted dissolution of schwertmannite can be described as follows:(1) formation of Fe(III)–NCS complexes on the schwertmannite surface and in solution, a process which increases the reactivity of solid phase Fe(III);(2) the extraction of Fe(III) from schwertmannite by SCNˉ and subsequent schwertmannite dissolution; and(3) the formation of secondary minerals from extracted Fe(III). These findings may improve AMD treatment strategies and provide insight into the use and potential reuse of schwertmannite as a trace element sorbent. | Cong Fan Chuling Guo Junhui Zhang Cui Ding Xiaofei Li John R.Reinfelder Guining Lu Zhenqing Shi Zhi Dang | 2019 | Journal of Environmental Sciences2019，31，6： | 3 |
| 3 | Endogenous Fe^(2+)-activated ROS nanoamplifier for esterase-responsive and photoacoustic imaging-monitored therapeutic improvement显示文摘Chemodynamic therapy(CDT)is well acknowledged as potent reactive oxygen species(ROS)-mediated anticancer strategy.Especially,the study about labile iron pool(LIP)as endogenous ferrous catalyzer has paved the way for future CDT development.However,limited H_(2)O_(2) expression,mild acidity,reduced glutathione(GSH)ablation of ROS,etc.,all require employing alternate peroxo-complex to achieve enhanced CDT effect.As a non-Fenton-type substrate,artesunate(ART)has been utilized as a source of free radicals through decomposition of endoperoxide bridges catalyzed by ferrous ions,nonetheless,the non-tumor-specific delivery,inferior pharmacokinetics,and hydrophobic nature minimize the efficacy of ART in physiological systems.Herein,we devise a PPA nanoamplifier by conjugating ART with PEG-functionalized Pd@Pt nanoplates(PP NPs)to form ester linkage,ensuring specific intratumoral esterase-responsive ART release.Significantly,the PPA nanoamplifier combines the in situ decomposition of ARTs endoperoxide bridges by Fe^(2+) to superoxide anions(O_(2)^(·-))and peroxidase(POD)-like enzymatic catalysis of endogenous H_(2)O_(2) by PP to hydroxyl radicals(*OH),thus achieving amplified ROS-mediated tumor therapy.Besides,PPA displays GSH destruction potential,thereby protecting ROS from the cleavage by GSH oxidation.In addition,the strong absorption of PPA in near-infrared(NIR)region also endows PPA with photoacoustic property to realize imaging-guided CDT.In short,by taking advantages of the high enrichment and esterase-responsive drug release at tumor sites,PPA amplified ROS signals via dual pathways,killing tumor cells in vitro are inhibiting tumor growth in vivo,thereby realizing high-efficiency non-Fenton CDT.We believe our novel anti-tumor strategy based on PPA will broaden the future of ROS-mediated tumor-targeted therapy. | Sijin Xiang Zhongxiong Fan Ziehen Ye Tianbao Zhu Dao Shi Shefang Ye Zhenqing Hou Xiaolan Chen | 2022 | Nano Research2022，15，2： | 2 |
| 4 | Hydrogel-elastomer-based stretchable strain sensor fabricated by a simple projection lithography method显示文摘Stretchable strain sensor detects a wide range of strain variation and is therefore a key component in various applications.Unlike traditional ones made of elastomers doped with conductive components or fabricated with liquid conductors,ionically conductive hydrogel-based strain sensors remain conductive under large deformations and are biocompatible.However,dehydration is a challenging issue for the latter.Researchers have developed hydrogel-elastomer-based strain sensors where an elastomer matrix encapsulates a hydrogel circuit to prevent its dehydration.However,the reported multistep approaches are generally time-consuming.Our group recently reported a multimaterial 3D printing approach that enables fast fabrication of such sensors,yet requires a self-built digital-light-processing-based multimaterial 3D printer.Here,we report a simple projection lithography method to fabricate hydrogel-elastomer-based stretchable strain sensors within 5 minutes.This method only requires a UV projector/lamp with photomasks;the chemicals are commercially available;the protocols for preparing the polymer precursors are friendly to users without chemistry background.Moreover,the manufacturing flexibility allows users to readily pattern the sensor circuit and attach the sensor to a 3D printed soft pneumatic actuator to enable strain sensing on the latter.The proposed approach paves a simple and versatile way to fabricate hydrogel-elastomer-based stretchable strain sensors and flexible electronic devices. | Zhenqing Li Xiangnan He Jianxiang Cheng Honggeng Li Yuan-Fang Zhang Xiaojuan Shi Kai Yu Hui Ying Yang Qi Ge | 2021 | International Journal of Smart and Nano Materials2021，12，3： | 1 |
| 5 | Pharmacokinetics,distribution,and excretion of sodium oligomannate,a recently approved anti-Alzheimer's disease drug in China显示文摘The National Medical Products Administration has authorized sodium oligomannate for treating mild-to-moderate Alzheimer’s disease.In this study,an LC-MS/MS method was developed and validated to quantitate sodium oligomannate in different biomatrices.The plasma pharmacokinetics,tissue distribution,and excretion of sodium oligomannate in Sprague-Dawley rats and beagle dogs were systematically investigated.Despite its complicated structural composition,the absorption,distribution,metabolism,and excretion profiles of the oligosaccharides in sodium oligomannate of different sizes and terminal derivatives were indiscriminate.Sodium oligomannate mainly crossed the gastrointestinal epithelium through paracellular transport following oral administration,with very low oral bioavailability in rats(0.6%-1.6%)and dogs(4.5%-9.3%).Absorbed sodium oligomannate mainly resided in circulating body fluids in free form with minimal distribution into erythrocytes and major tissues.Sodium oligomannate could penetrate the blood-cerebrospinal fluid(CSF)barrier of rats,showing a constant area under the concentration-time curve ratio(CSF/plasma)of approximately 5%.The cumulative urinary excretion of sodium oligomannate was commensurate with its oral bioavailability,supporting that excretion was predominantly renal,whereas no obvious biliary secretion was observed following a single oral dose to bile duct-cannulated rats.Moreover,only 33.7%(male)and 26.3%(female)of the oral dose were recovered in the rat excreta within 96 h following a single oral administration,suggesting that the intestinal flora may have ingested a portion of unabsorbed sodium oligomannate as a nutrient. | Jiaojiao Lu Qiongqun Pan Jieqiang Zhou Yan Weng Kaili Chen Lv Shi Guanxiu Zhu Chunlin Chen Liang Li Meiyu Geng Zhenqing Zhang | 2022 | Journal of Pharmaceutical Analysis2022，12，1： | 1 |
| 6 | Extraction of Cr(Ⅵ) from chromite ore processing residue via hydrothermal-assisted phase transformation显示文摘The effective extracting Cr(Ⅵ) from chromite ore processing residue(COPR) is the key to achieve COPR detoxification and recovery.We developed an effective method to extract Cr(Ⅵ) from COPR via controlling the phase transformation of Cr(Ⅵ)-containing minerals.Characteristic analysis showed that Cr(Ⅵ) was mainly incorporated in the hydrocalumite(NaCa4Al2O6(SO4/CrO4)1.5-15H2O) in COPR,which was a layered-double hydroxide(LDH) with multilayer structure.In the hydrothermal treatment experiments,the Na2CO3 solution showed significant extraction effect of Cr(Ⅵ) and detoxification effect of COPR.After treatment,95% of Cr(Ⅵ) was removed and the Cr(Ⅵ) concentration in the leachate was decreased to 1.6 mg/L by the toxicity characteristic leaching procedure(TCLP),within the regulatory limit disposal standard(HJ/T 301-2007,3 mg/L).Further study revealed that,during the treatment,hydrocalumite transformed into calcite(CaCO3) under the effect of mineralizer,therefore,the layered structure collapsed and the incorporated Cr(Ⅵ) was released to the supernatant.Meanwhile,the Cr(Ⅵ)desorbed from calcite with the calcite particles grew into large size with smooth surface.Stir-flow experiment revealed that the amount of chromium released from CORP to the environment was significantly reduced after treatment,and it is safer for landfill disposal.This work will provide an instructive guidance for the detoxification and recovery of COPR. | Xiaofeng Mo Jin Zhou Le Lin Zuqi Zhong Shaohua Yang Xueming Liu Zhenqing Shi Dongye Zhao Zhang Lin | 2020 | Chinese Chemical Letters2020，31，7： | 1 |
| 7 | Phospholipase D provides a survival signal in human cancer cells with activated H-Ras or K-Ras显示文摘 | Shi M Zhenq Y Garcia A | 2007 | Cancer Lett2007，258，2： | 1 |
| 8 | Effects of nano zero-valent iron on oxidation-reduction potential 显示文摘 | SHI Zhenqing NURMI T J TRATNYEK G P | 2011 | Environ Sci Technol2011，45，4： | 1 |
| 9 | Quantifying the multi-scale kinetic processes in soil environments:Frontiers and challenges显示文摘Understanding soil kinetic processes is essential for predicting the fate of contaminants and elemental cycling in the environment since the biogeochemical reactions in soil rarely reach equilibrium in the field due to the frequent changes of natural conditions.However,quantifying the soil kinetic processes is one of the most challenging topics in environmental geosciences,because it is complicated by the heterogeneous nature of the soil system,the coupling of multiple biogeochemical and transport processes,and the requirements of linking varying temporal and spatial scales in quantitative modeling.Soil is a complex mixture containing soil organic matter(SOM),minerals,and microbes,whose properties and distributions are highly heterogeneous and control chemical flux in soil environments.The dynamic coupling of multiple geochemical reactions(e.g.,sorption/desorption,reduction/oxidation,and precipitation/dissolution),microbiological processes(e.g.,biomass growth and organic matter decomposition),and transport processes(e.g.,diffusion and advection)at varying temporal and spatial scales is a key feature of soil kinetic processes,and is fundamentally important for their quantitative descriptions. | Shi Zhenqing Yang Xiaofan Liu Chongxuan | 2021 | Fundamental Research2021，1，3： | 0 |
| 10 | High-speed penetration of ogive-nose projectiles into thick concrete targets:Tests and a projectile nose evolution model显示文摘The majority of the projectiles used in the hypersonic penetration study are solid flat-nosed cylindrical projectiles with a diameter of less than 20 mm.This study aims to fill the gap in the experimental and analytical study of the evolution of the nose shape of larger hollow projectiles under hypersonic penetration.In the hypersonic penetration test,eight ogive-nose AerMet100 steel projectiles with a diameter of 40 mm were launched to hit concrete targets with impact velocities that ranged from 1351 to 1877 m/s.Severe erosion of the projectiles was observed during high-speed penetration of heterogeneous targets,and apparent localized mushrooming occurred in the front nose of recovered projectiles.By examining the damage to projectiles,a linear relationship was found between the relative length reduction rate and the initial kinetic energy of projectiles in different penetration tests.Furthermore,microscopic analysis revealed the forming mechanism of the localized mushrooming phenomenon for eroding penetration,i.e.,material spall erosion abrasion mechanism,material flow and redistribution abrasion mechanism and localized radial upsetting deformation mechanism.Finally,a model of highspeed penetration that included erosion was established on the basis of a model of the evolution of the projectile nose that considers radial upsetting;the model was validated by test data from the literature and the present study.Depending upon the impact velocity,v0,the projectile nose may behave as undistorted,radially distorted or hemispherical.Due to the effects of abrasion of the projectile and enhancement of radial upsetting on the duration and amplitude of the secondary rising segment in the pulse shape of projectile deceleration,the predicted DOP had an upper limit. | Xu Li Yan Liu Junbo Yan Zhenqing Shi Hongfu Wang Yingliang Xu Fenglei Huang | 2024 | Defence Technology(防务技术)2024，32，2： | 0 |
| 11 | Experimental and numerical analyses of the effect of fibre content on the close-in blast performance of a UHPFRC beam显示文摘Limited research has been conducted on the influences of fiber content on close-in blasting characteristics for ultrahigh-performance fiber-reinforced concrete(UHPFRC)beams.This paper aims to address this knowledge gap through experimental and mesoscale numerical methods.Experiments were conducted on ten UHPFRC beams built with varying steel fiber volumetric fractions subjected to close-in explosive conditions.Additionally,this study considered other parameters,such as the longitudinal reinforcement type and ratio.In the case of UHPFRC beams featuring normal-strength longitudinal reinforcement of diametersΦ12,Φ16,andΦ20,a reduction in maximum displacement by magnitudes of19.6%,19.5%,and 17.4%was observed,respectively,as the volumetric fractions of fiber increased from1.0%to 2.5%.In addition,increasing the longitudinal reinforcement ratio and using high-strength steel longitudinal reinforcement both significantly reduced the deformation characteristics and increase the blasting resistances of UHPFRC beams.However,the effects on the local crushing and spalling damage were not significant.A mesoscale finite element model,which considers the impacts of fiber parameters on UHPFRC beam behaviors,was also established and well correlated with the test findings.Nevertheless,parametric analyses were further conducted to examine the impacts of the steel fiber content and length and the hybrid effects of various types of microfibers and steel fibers on the blasting performance of UHPFRC beams. | Junbo Yan Qiyue Zhang Yan Liu Yingliang Xu Zhenqing Shi Fan Bai Fenglei Huang | 2024 | Defence Technology(防务技术)2024，31，1： | 0 |
| 12 | Research Progress on the Influence of Varying Fiber Contents on Mechanical Properties of Recycled Concrete显示文摘Applying recycled concrete for engineered projects not only protects the ecological environment but also improves the utilization rate of waste concrete to satisfy sustainable development requirements.However,the mechanical properties of recycled concrete are not as good as those of ordinary concrete.To enhance the former’s performance and increase its popularity and application in engineeringfields,notable advances have been made by using steel,synthetic,plant,and mineralfiber materials.These materials are added to recycled concrete to improve its mechanical properties.Studies have shown that(1)steelfibers have a distinct reinforcing effect and improve the strength,toughness,and elastic modulus of recycled concrete;(2)the addition of syntheticfibers can improve the tension,crack resistance,and durability of concrete,but the size effect needs to be further explored and elaborated;(3)plantfiber concrete is lightweight and environmentally friendly and provides high toughness and good thermal insulation,but thefibers corrode in alkaline environments;in addition,plantfibers have high water absorption capacity,which leads to wet expansion and dry shrinkage phenomena,which need to be further studied;and(4)the cost of basaltfiber,a mineralfiber,is relatively low,and a suitable basalt content can improve the mechanical properties of recycled concrete to a certain extent. | Zhenqing Shi Guomin Sun Jianyong Pang | 2023 | Structural Durability & Health Monitoring2023，17，3： | 0 |
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