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Study on high-order frequency selective surface with interdigital capacitance loading

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The Journal of China Universities of Posts and Telecommunications 2024年第1期31卷 57-63页

作者： Zheng Guangming Zhou Tianle Lu Haiwei Long Yifei bai jing School of Electronics Engineering of Xi'an University of Posts and Telecommunications Xi'an 710121China

The application of frequency selection surfaces(FSSs)is limited by large area,narrow bandwidth,low stopband inhibition and large ripple in the passband.A method for designing high-order wide band miniaturized-element frequency selective surface(MEFSS)with capacitance loading is *** proposed structure is composed of multiply sub-wavelength interdigital capacitance layer,sub-wavelength inductive wire grids separated by dielectric substrates.A simple equivalent circuit model,composed of short transmission lines coupled together with shunt inductors and capacitors,is presented for this *** the equivalent circuit model and electromagnetic(EM)model,an analytical synthesis procedure is developed that can be used to synthesize the MEFSS from its desired system-level performance indicators such as the center frequency of operation,bandwidth and stopband *** this synthesis procedure,a prototype of the proposed MEFSS with a third-order bandpass response,center frequency of 2.75 GHz,fractional bandwidth of 8%is designed,fabricated,and *** measurement results confirm the theoretical predictions and the design procedure of the structure and demonstrate that the proposed MEFSS has a stable frequency response with respect to the angle of incidence of the EM wave in the±30°range incidence,and the in-band return loss is greater than 18 dB,and the rejection in the stopband is greater than 25 dB at the frequency of 3.2 GHz.

关键词： frequency selective surface high-order bandpass filter periodic structures interdigital capacitance

Effect of two-step solid solution on microstructure andδphase precipitation of Inconel 718 alloy

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2199-2207页

作者： Enyu Liu Qingshuang Ma Xintong Li Aoxue Gao jing bai Liming Yu Qiuzhi Gao Huijun Li School of Materials Science and Engineering Northeastern UniversityShenyang 110819China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China School of Materials Science&Engineering Tianjin UniversityTianjin 300354China School of Mechanical Materials and Mechatronic EngineeringUniversity of WollongongWollongongNSW 2522Australia

Inconel 718 is the most popular nickel-based superalloy and is extensively used in aerospace,automotive,and energy indus-tries owing to its extraordinary thermomechanical *** effects of different two-step solid solution treatments on microstructure andδphase precipitation of Inconel 718 alloy were studied,and the transformation mechanism fromγ″metastable phase toδphase was *** precipitates were statistically analyzed by X-ray *** results show that theδphase content firstly increased,and then decreased with the temperature of the second-step solid *** changes in microstructure andδphase were studied by scanning electron microscopy and transmission electron *** intragranularδphase formed in Inconel 718 alloy at the second-[100]_(δ)[011]γ step solid solution temperature of 925℃,and its orientation relationship withγmatrix was determined as//and(010)_(δ)//(111)γ.Furthermore,the Vickers hardness of different heat treatment samples was measured,and the sample treated by second-step solid solution at 1010℃ reached the maximum hardness of HV 446.84.

关键词： Inconel 718 alloy two-step solid solution treatment δphase γ″-δtransformation

Manipulation of magnetocaloric and elastocaloric effects in Ni-Mn-In alloys by lattice volume and magnetic variation:Effect of Co and Fe co-doping

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Journal of Materials Science & Technology 2024年第5期172卷 156-165页

作者： Xinzeng Liang Chi Zhang jing bai Jianglong Gu Yudong Zhang Claude Esling Xiang Zhao Liang Zuo School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China Key Laboratory for Anisotropy and Texture of Materials Northeastern UniversityShenyang 110819China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Laboratoire d’Étude des Microstructures et de Mécanique des Matériaux LEM3 CNRSUMR 7239University of Lorraine57045 MetzFrance

The effects of Co and Fe co-doping Ni-Mn-In alloy on the phase stability,lattice parameters,mag-netic properties,and electronic structures are systematically investigated by using the first-principles *** indicate that Fe atoms replace the excess Mn2 atoms by direct and indirect coex-istence(Fe→Mn 2 and Fe→In→Mn2);Co substitutes the Ni atoms by direct substitution(Co→Ni)for the Ni-Mn-In *** austenites all exhibit the ferromagnetic(FM)state for the studied *** NM martensites are in the ferrimagnetic(FIM-1)state for the Ni_(2)Mn_(1.5)In_(0.5),Ni_(2)Mn_(1.25)In_(0.5)Fe 0.25,Ni_(1.75)Mn_(1.5)In_(0.5)Co_(0.25),and Ni_(1.75)Mn_(1.25)In_(0.5)Co_(0.25)Fe 0.25 alloys,while the other compositions are in the FM *** phase stability of austenite and martensite decreases with increasing Co and Fe co-doping.A magnetic-structural coupling transition occurs at x<0.25 and y<*** Ni_(1.91)Mn_(1.5)In_(0.5)Co_(0.08)and Ni_(1.91)Mn_(1.42)In_(0.5)Co_(0.08)Fe_(0.08)alloys exhibit an A→6M→NM transformation,accompanied by a magnetic *** Co and Fe are co-doped,the hybridization strength between Co and Fe is greater than that between Co/Fe and *** enhancement of magnetocaloric and elastocaloric effects is favored by larger magnetization difference(△M)and lattice volume change(△V/V_(0)).Based on the calculated phase stability,magneto-structure coupling,△V/V 0 and c/a ratio,one can predict that the Ni_(2)-x Mn_(1.5)-y In_(0.5)Co x Fe y alloy with Co content 0≤x≤0.25 and Fe content 0≤y≤0.05 is predicted to have good magneto-controlled functional behavior.

关键词： Ni-Mn-In-Co-Fe Phase stability Magnetocaloric effect Elastocaloric effect

Paleoenvironmental Evolution and Organic Matter Enrichment Genesis of the Late Turonian Black Shale in the Southern Songliao Basin, NE China

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Acta Geologica Sinica(English Edition) 2024年第5期98卷 1338-1358页

作者： bai jing XU Xingyou LIU Weibin ZHAO Wenzhi JIANG Hang State Key Laboratory of Continental Shale Oil Key Laboratory of Unconventional Oil and Gas China Geological Survey Oil and Gas Survey China Geological Survey Research Institute of Petroleum Exploration Development of PetroChina Strategic Research Center of Oil and Gas Resources Ministry of Natural Resources

The Upper Cretaceous Qingshankou Formation black shales, deposited in the late Turonian(LTB shales), are the main source rocks of the Songliao Basin. The origins of organic matter enrichment of the shales is a contentious subject fuelling many ongoing debates. This study investigates the genesis of the organic matter-rich shale by using molecular geochemistry. The LTB shales can be divided into three sections. The Section Ⅰ shales were deposited in saline, stratified and anoxic water conditions, which are related to seawater incursion events. At least three episodic and periodic seawater incursion events were recognized during Section Ⅰ shale deposition. The Section Ⅱ shales deposited in brackish to fresh and deep lake-level conditions with high primary productivity, which are related to lake-level transgression. The Section Ⅲ shales were deposited under fresh and slightly oxidized water conditions, which are related to lake-level regression. Two organic matter enrichment models for the LTB shales are identified, that is, the seawater incursion model and the maximum lake-level transgression sedimentation model, which act on different shale sections, both playing significant roles in the enrichment of organic matter.

关键词： Cretaceous enrichment genetics late Turonian organic matter-rich shale paleoenvironmental evolution Songliao Basin

Cation-πinteractions regulate electrocatalytic water oxidation over iridium single atoms supported on conjugated polymers

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Science China Chemistry 2024年第6期67卷 2063-2069页

作者： jing bai Yunxia Liu Ziwei Ma Shouhan Zhang Guojie Chao Haiping Lin Elke Debroye Longsheng Zhang Tianxi Liu Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi214122China School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi’an710072China School of Physics and Information Technology Shanxi Normal UniversityXi’an710062China Department of Chemistry KU LeuvenCelestijnenlaan 200FLeuven3001Belgium

Designing cost-effective and high-performing metal catalysts is significant for many renewable energy conversion *** metal loading without sacrificing activity and durability is highly desired for the catalyst design,especially for those reactions where the noble metals deliver the best catalyzing ***-atom catalysts(SACs)with maximal metalatom utilization,homogeneous and tailorable active sites have emerged as promising catalyst candidates,where the local coordination structures of the metal atoms in SACs largely determine the reaction *** design strategies of constructing strong metal-support interactions can stabilize the individual metal atoms in SACs,but present obstacles to provide a flexible manipulation platform for elaborately tailoring the coordination structures to achieve performance optimization towards a specifically targeted ***,for the proof-of-concept study,we report a novel design of SAC with iridium(Ir)single atoms supported on conjugated polymer,in which the adsorption energies of reaction intermediates on Ir atoms and the reaction kinetics towards acidic water oxidation can be readily optimized through modulating the formed cation-πinteractions that can be tailored by adjusting the molecular structures of conjugated *** strategy establishes a general route to develop targeted SACs for various catalytic reactions.

关键词： conjugated polymers single-atom catalysts cation-πinteractions oxygen evolution reaction

Dendritic mesoporous silica nanoparticles for enzyme immobilization

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Green Chemical Engineering 2024年第2期5卷 173-186页

作者： Shuling Zhang jing bai Weixi Kong Haolei Song Yunting Liu Guanhua Liu Li Ma Liya Zhou Yanjun Jiang School of Chemical Engineering and Technology Hebei University of TechnologyTianjin300130China College of Food Science and Biology Hebei University of Science&TechnologyShijiazhuang050018China Hebei Yanuo Bioscience Co. Ltd.Shijiazhuang052165China

Dendritic mesoporous silica nanoparticles(DMSNs)are a new class of solid porous materials used for enzyme immobilization support due to their intrinsic characteristics,including their unique open central-radial structures with large pore channels and their excellent *** this review,we review the recent progress in research on enzyme immobilization using DMSNs with different structures,namely,flower-like DMSNs and tree-branch-like *** DMSN synthesis methods are briefly compared,and the distinct characteristics of the two DMSN types and their effects on the catalytic performance of immobilized enzymes are comprehensively *** directions for future research on enzyme immobilization using DMSNs are also proposed.

关键词： Dendritic mesoporous silica nanoparticles Enzyme immobilization Flower-like Tree-branch-like Central-radial structure

Clinical Research of Transumbilical Singleport Laparoscopic Treatment For Pediatric Intussusception

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Expert Review of Chinese Medical

Expert Review of Chinese Medical 2024年第2期2卷 43-47页

作者： jing bai Xianzong Xiang Dalian Children's Hospital Affiliated to Dalian Medical University College of Pharmacy and Nursing Hubei Medical University

Objective:To explore the feasibility and clinical efficacy of single port laparoscopic surgery through the umbilical cord for the treatment of pediatric ***:Clinical data of 38 cases of pediatric intussusception treated with umbilical single port laparoscopic surgery from December 2017 to June 2019 were *** surgical method involves placing Trocar through the umbilical incision to establish pneumoperitoneum,inserting a single hole with a 0°laparoscopic operating channel,exploring intussusception,and performing non-invasive forceps to completely reduce *** the reduction of intussusception,if intestinal malformation is found,the umbilical incision can be expanded to lift the diseased intestinal tract out of the abdominal cavity for *** the same time,clinical data of 24 children who underwent traditional porous laparoscopic intussusception surgery during the same period were collected,and the surgical time,intraoperative blood loss,postoperative hospital stay,and satisfaction score of incision aesthetics were compared between the two groups of ***:Both groups of patients successfully completed the surgery,and compared with the porous laparoscopic group,the single hole laparoscopic group had a shorter surgical time[(32.4±8.6)minutes vs.(40.6±9.8)minutes,P<0.05],decreased bleeding volume[(5.5±1.5)mL vs.(8.6±2.2)mL,P<0.05],significantly shortened postoperative hospital stay[(4.6±1.2)d vs.(6.2±1.4)d,P<0.05],and significantly increased satisfaction score with incision aesthetics[(4.2±0.8)points vs.(3.2±0.7)points,P<0.05].Follow up for 6 months to 2 years showed no recurrence of ***:Transumbilical single port laparoscopic surgery is a safe and effective method for children with intussusception,which is characterized by small trauma,fast recovery,short operation time,and better aesthetic effect.

关键词： intussusception single-port laparoscopy child

Unraveling magnetic properties and martensitic transformation in Mn-rich Ni-Mn-Sn alloys:first-principles calculations and experiments

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Rare Metals 2024年第4期43卷 1769-1785页

作者： Yu Zhang jing bai Ke-Liang Guo Jia-Xin Xu Jiang-Long Gu Nicola Morley Qui-Zhi Gao Yu-Dong Zhang Claude Esling Xiang Zhao Liang Zuo Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang110819China Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province School of Resources and MaterialsNortheastern University at QinhuangdaoQinhuangdao066004China Department of Material Science and Engineering University of SheffieldSheffieldS13JDUK State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao066004China Laboratoire d’Étude des Microstructures Et de Mécanique des Matériaux University of Lorraine57045MetzFrance

We have investigated the phase stability,magnetic properties,and martensitic transformation thermodynamics/kinetics of the Ni_(24-x)Mn_(18+x+y)Sn_(6-y)(x,y=0,1,2)system by combining the first-principles calculations and *** calculation results show that the optimized lattice parameters are consistent with the experimental ***,we obtain the relation equation for the austenite formation energy(E_(form-A))and Mn content(X_(Mn)):E_(form-A)=507.358X_(Mn)-274.126,as well as for the six-layer modulated(6M)martensite formation energy(E_(form-6M))and Ni content(X_(Ni)):E_(form-6M)=-728.484X_(Ni)+*** ternary phase diagram of the total magnetic moment was *** excess Mn will reduce the total magnetic moment of 6M(Mag6M)and non-modulated(NM)(MagNM)martensites,with the following equations relating the total magnetic moment and Mn content:Mag_(6M)=-15.905X_(Mn)+7.902and Mag_(NM)=-14.781X_(Mn)+7.411,while the effect on austenite is *** variation of total magnetic moment is mainly dominated by the Mn atomic magnetic *** 3d electrons of Mn_(Sn)(Mn at Sn sublattice)play an important role in magnetic properties from the perspective of the electronic density of *** on the thermodynamics of martensitic transformation,the alloys will likely undergo austenite?6M?NM transformation *** the thermodynamic and kinetic results,the martensitic transformation temperature decreases with x increasing and increases with y *** results are expected to provide reference for predicting the phase stability and magnetic properties of NiMn-Sn alloys.

关键词： Ni-Mn-Sn First-principles calculations Martensitic transformation Magnetic property Kinetics

Asymmetric reduction of conjugated C=C bonds by immobilized fusion of old yellow enzyme and glucose dehydrogenase

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Green Synthesis and Catalysis

Green Synthesis and Catalysis 2024年第2期5卷 80-87页

作者： Yongxing Li Pengqian Luan Lele Dong Jianqiao Liu Luying Jiang jing bai Fufeng Liu Yanjun Jiang School of Chemical Engineering and Technology Hebei University of TechnologyTianjin 300130China College of Food Science and Biology Hebei University of Science&Technology26 Yuxiang StreetYuhua DistrictShijiazhuang 050018China Key Laboratory of Industrial Fermentation Microbiology of Ministry of Education Tianjin Key Laboratory of Industrial MicrobiologyCollege of BiotechnologyTianjin University of Science&TechnologyTianjin 300457China

Asymmetric reduction of the conjugated C=C bonds by the old yellow enzymes(OYEs)presents a promising field in the synthesis of chiral ***,few natural OYEs have been applied in large-scale applications due to the requirement of costly NADPH and low operational ***,a stable and efficient fusion of YqjM from Bacillus subtilis and glucose dehydrogenase(GDH)from Bacillus megaterium was constructed to stereoselectively reduce the conjugated C=C bonds in a self-sufficient continuous *** effects of the enzyme order and different linkers on the fusions were investigated by structural analysis and all-atom molecular dynamics *** best fusion YqjM_G_GDH gave 98% conversion of 100 mmol/L 2-methylcyclopentenone with an excellent ee value(>99%)in 3 h,while the mixture of individual enzymes only obtained 68% conversion after more than 8 *** improved substrate conversion of YqjM_G_GDH fusion was probably attributed to the increased flexibility of each fused enzyme and the shortening of the diffusion distance of NADPH regenerated.A one-pot process was designed to purify and immobilize the fusion on the Ni2t-nitrilotriacetic acid functionalized magnetic mesoporous silica *** resulting immobilized biocatalyst not only catalyzed the asymmetric reduction of various α,β-unsaturated ketones(20 mmol/L)continuously with only 50μmol/L NADPt to initiate the whole process,but also retained more than 82%of the initial activity after seven cycles,serving as a good candidate for the industrial applications.

关键词： Enzyme fusion Old yellowenzymes Asymmetricreduction C=C bond Cofactor regeneration Immobilization