7039 Al alloys are widely used in armor vehicles,given the material’s high specific strength and fracture ***,laminar tearing in the thickness plane of the base metal(BM),specifically in the normal direction(ND)and r...
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7039 Al alloys are widely used in armor vehicles,given the material’s high specific strength and fracture ***,laminar tearing in the thickness plane of the base metal(BM),specifically in the normal direction(ND)and rolling direction(RD)plane,was occasionally observed after the welding of thick plates,resulting in premature material failure.A vertically metal-inert gas(MIG)-welded laminar tearing component of a 30 mm thick plate was analyzed to determine the factors associated with this *** texture,residual stress,microhardness,and tensile properties were also *** results indicated that the crack extended along the RD as a transcrystalline fracture and terminated at the *** grains near the crack grew preferentially in the(001)crystal ***,the tensile strength(83 MPa)and elongation(6.8%)in the RD were relatively higher than those in the *** particular,the primary factors for crack initiation include stronger texture,higher dislocation density,increased Al_(7)Cu_(2)Fe phases,lower proportion of small-angle grain boundaries,and varying grain sizes in different regions,leading to the fragile *** higher residual stress of the BM promotes the formation and extension of *** restraining force due to fixation and welding shrinkage force transformed the crack into laminar *** measures of laminar tearing were also proposed.
Photocatalytic hydrogen peroxide(H_(2)O_(2))production has been considered as a promising strategy for H_(2)O_(2)synthesis due to its environmentally *** various photocatalysts,carbon nitride-based materials are excel...
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Photocatalytic hydrogen peroxide(H_(2)O_(2))production has been considered as a promising strategy for H_(2)O_(2)synthesis due to its environmentally *** various photocatalysts,carbon nitride-based materials are excellent candidates for H_(2)O_(2)production because of their excellent visible-light response,low cost and high *** this review,we summarize in detail the research progress on the photocatalytic production of H_(2)O_(2)by carbon ***,we summarize the basic principles of photocatalysis and photocatalytic H_(2)O_(2)***,the classification and modification methods of carbonnitride-based materials are discussed,including morphology modulation,noble metal loading,defect control,heterojunction regulation,molecular structure engineering and elemental ***,the different in-situ applications of H_(2)O_(2)via photosynthesis were discussed,including disinfection and antibiotic resistant genes degradation,organic pollutants degradation,medical applications and fine chemical *** review brings great promise for in-situ H_(2)O_(2)photosynthesis,which is expected to serve as a key component in future applications.
Plant-specific homeodomain-leucine zipper I (HD-Zip I) transcription factors (TFs) crucially regulate plant drought tolerance. However, their specific roles in maize (Zea mays L.) regulating drought tolerance remain l...
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Plant-specific homeodomain-leucine zipper I (HD-Zip I) transcription factors (TFs) crucially regulate plant drought tolerance. However, their specific roles in maize (Zea mays L.) regulating drought tolerance remain largely unreported. Here, we screened a maize HD-Zip I TF family gene, ZmHB53, and clarified its role in drought stress. ZmHB53 overexpression maize plants exhibited sensitivity to abscisic acid (ABA), tolerant to polyethylene glycol (PEG 6000)-induced stress during germination, along with improved seedling drought resistance. Compared to the wild-type, ZmHB53 overexpression lines show higher water retention, biomass, and survival rates, and reduced water loss and stomatal size under drought, suggesting ZmHB53 ' s role in drought adaptation. DNA affinity purification sequencing (DAP-Seq), yeast one hybrid, electrophoretic mobility shift assay (EMSA), and dual luciferase showed that ZmHB53 directly bound to and upregulated the expression of ABA receptor ZmPYL4. Meanwhile, transgenic plants overexpressing ZmPYL4 also exhibit ABA sensitivity and drought tolerance. The research results provide novel insights into the regulatory role of ZmHB53 and ZmPYL4 in enhancing maize's drought tolerance, establishing a foundation for future validation and potential application of ZmHB53 in strategies to improve maize resistance to drought.
Fibers with deformation-triggered responses are essential for smart textiles and wearable ***,smart core-shell elastomer fibers with a conductive core and a liquid crystal elastomer shell showing simultaneous resistan...
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Fibers with deformation-triggered responses are essential for smart textiles and wearable ***,smart core-shell elastomer fibers with a conductive core and a liquid crystal elastomer shell showing simultaneous resistance and color responses are designed and *** conductive core is consisted of interconnected liquid metal nanodroplets dispersed in a polymer matrix and the elastomer shell is made of cholesteric liquid *** stretched,the fiber resistance increases as the interconnected pathways of liquid metal nanodroplets along the fiber axis become narrower,and the selective reflection color from the fiber surface blueshifts since the cholesteric pitch *** smart elastomer fibers could be woven into smart textiles and respond to various mechanical deformations,including stretching,bending,compression and *** average resistance change is 51%under 100%strain and its variation is smaller than 4%over 500 cycles,showing remarkable fatigue *** simultaneous resistance and color responses to mechanical deformations make the fibers attractive for broad applications,such as flexible electronics.
Constructing a framework carrier to stabilize protein conformation,induce high embedding efficiency,and acquire low mass-transfer resistance is an urgent issue in the development of immobilized ***-bonded organic fram...
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Constructing a framework carrier to stabilize protein conformation,induce high embedding efficiency,and acquire low mass-transfer resistance is an urgent issue in the development of immobilized ***-bonded organic frameworks(HOFs)have promising application potential for embedding *** fact,no metal involvement is required,and HOFs exhibit superior biocompatibility,and free access to substrates in mesoporous ***,a facile in situ growth approach was proposed for the self-assembly of alcohol dehydrogenase encapsulated in *** micron-scale bio-catalytic composite was rapidly synthesized under mild conditions(aqueous phase and ambient temperature)with a controllable embedding *** high crystallinity and periodic arrangement channels of HOF were preserved at a high enzyme encapsulation efficiency of 59%.This bio-composite improved the tolerance of the enzyme to the acid-base environment and retained 81%of its initial activity after five cycles of batch hydrogenation involving NADH *** on this controllably synthesized bio-catalytic material and a common lipase,we further developed a two-stage cascade microchemical system and achieved the continuous production of chiral hydroxybutyric acid(R-3-HBA).
The environmental threat posed by stibnite is an important geoenvironmental issue of current *** better understand stibnite oxidation pathways,aerobic abiotic batch experiments were conducted in aqueous solution with ...
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The environmental threat posed by stibnite is an important geoenvironmental issue of current *** better understand stibnite oxidation pathways,aerobic abiotic batch experiments were conducted in aqueous solution with varyingδ^(18)O_(H_(2)O) value at initial neutral pH for different lengths of time(15-300 days).The sulfate oxygen and sulfur isotope compositions as well as concentrations of sulfur and antimony species were *** sulfur isotope fractionation factor(△^(34)S_(SO4-stibnite))values decreased from 0.8‰to-2.1‰during the first 90 days,and increased to 2.6‰at the 180 days,indicating the dominated intermediate sulfur species such as S_(2)O_(3)^(2-),S0,and H_(2)S(g)involved in Sb2S3 oxidation *** incorporation of O into sulfate derived from O_(2)(~100%)indicated that the dissociated O_(2)was only directly adsorbed on the stibnite-S sites in the initial stage(0-90 days).The proportion of O incorporation into sulfate from water(27%-52%)increased in the late stage(90-300 days),which suggested the oxidation mechanism changed to hydroxyl attack on stibnite-S sites promoted by nearby adsorbed O_(2)on stibnite-Sb *** exchange of oxygen between sulfite and water may also contributed to the increase of water derived O into SO42-.The new insight of stibnite oxidation pathway contributes to the understanding of sulfide oxidation mechanism and helps to interpret field data.
Diode-rectifier-based high-voltage direct current(DR-HVDC)systems are considered an attractive solution for integrating offshore wind farms(OWFs).Grid-forming(GFM)control with a rational reactive power allocation capa...
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Diode-rectifier-based high-voltage direct current(DR-HVDC)systems are considered an attractive solution for integrating offshore wind farms(OWFs).Grid-forming(GFM)control with a rational reactive power allocation capability is crucial for the safe operation of numerous wind turbines(WTs).Most typical GFM controls aim to share surplus reactive power of the system equally among WTs,easily rendering capacity overloads for WTs that are outputting high levels of active *** this paper,a novel GFM control for OWFs is proposed,allowing for adaptively allocating the reactive power according to the actual active power output of ***,the reactive power characteristics of the AC collection networks and WTs are analyzed across a wide wind power ***,combining the positive correlation of WT active power with the output AC voltage,a Q-θtype GFM control for WTs is *** adaptive reactive power allocation mechanism and the parameter design of the Q-θbased reactive power controller are elucidated,ensuring that WTs with lower active power output contribute more reactive power to the system than WTs with higher active power *** AC impedance models of WTs under various GFM controls are established to evaluate the impact of different reactive power ***,the feasibility of the proposed control is validated in PSCAD/EMTDC,accompanied by stability analysis.
Ball milling is an environmentally friendly technology for the remediation of petroleumcontaminated soil(PCS),but the cleanup of organic pollutants requires a long time,and the post-remediation soil needs an economica...
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Ball milling is an environmentally friendly technology for the remediation of petroleumcontaminated soil(PCS),but the cleanup of organic pollutants requires a long time,and the post-remediation soil needs an economically viable disposal/reuse strategy due to its vast *** present paper develops a ball milling process under oxygen atmosphere to enhance PCS remediation and reuse the obtained carbonized soil(BCS-O)as wastewater treatment *** total petroleum hydrocarbon removal rates by ball milling under vacuum,air,and oxygen atmospheres are 39.83%,55.21%,and 93.84%,*** Langmuir and pseudo second-order models satisfactorily describe the adsorption capacity and behavior of BCS-O for transition *** Cu^(2+),Ni^(2+),and Mn^(2+)adsorbed onto BCS-O were mainly bound to metal carbonates and metal ***,BCS-O can effectively activate persulfate(PDS)oxidation to degrade aniline,while BCS-O loaded with transition metal(BCS-O-Me)shows better activation efficiency and ***-O and BCS-O-Me activated PDS oxidation systems are dominated by^(1)O_(2)oxidation and electron *** main active sites are oxygen-containing functional groups,vacancy defects,and graphitized *** oxygen-containing functional groups and vacancy defects primarily activate PDS to generate^(1)O_(2)and attack *** carbon promotes aniline degradation by accelerating electron *** paper develops an innovative strategy to simultaneously realize efficient remediation of PCS and sequential reuse of the postremediation soil.
Verticillium wilt caused by the soil-borne fungus Verticillium dahliae Kleb., is a destructive plant disease that instigates severe losses in many crops. Improving plant resistance to Verticillium wilt has been a chal...
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Verticillium wilt caused by the soil-borne fungus Verticillium dahliae Kleb., is a destructive plant disease that instigates severe losses in many crops. Improving plant resistance to Verticillium wilt has been a challenge in most crops. In this study, a V. dahliae secreted protein VdSP8 was identified and shown to activate hyper-sensitive response (HR) and systemic acquired resistance (SAR) to Pseudomonas syringae pv. tomato DC3000 (Pst DC3000) and Botrytis cinerea in tobacco plants. We identified a beta-glucosidase named GhBGLU46 as a cotton plant target of VdSP8. VdSP8 interacts with GhBGLU46 both in vivo and in vitro and promotes the beta-glucosidase activity of GhBGLU46. Silencing of GhBGLU46 reduced the expression of genes involved in lignin biosynthesis, such as GhCCR4, GhCCoAOMT2, GhCAD3 and GhCAD6, thus decreasing lignin deposition and increasing Verticillium wilt susceptibility. We have shown that GhBGLU46 is indispensable for the function of VdSP8 in plant resistance. These results suggest that plants have also evolved a strategy to exploit the invading effector protein VdSP8 to enhance plant resistance.
Highlights The RT-RAA-VF assay developed for the NiV P gene can perform rapid detection of NiV within 20 min at 42℃ with high *** assay is capable of attaining sensitivity to a single copy of NiV RNA *** assay effect...
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Highlights The RT-RAA-VF assay developed for the NiV P gene can perform rapid detection of NiV within 20 min at 42℃ with high *** assay is capable of attaining sensitivity to a single copy of NiV RNA *** assay effectively avoids false positives caused by aerosol contamination with a sealed disposable nucleic acid visualization test paper device.
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