Under the background of a transformation of the global energy structure,coal gasification technology has a wide application prospect,but its by-product,the coal gasification residue(CGR),is still not being efficiently...Under the background of a transformation of the global energy structure,coal gasification technology has a wide application prospect,but its by-product,the coal gasification residue(CGR),is still not being efficiently utilized for recycling.The CGR contains abundant carbon components,which could be applied to the microwave absorption field as the carbon matrix.In this study,Fe/CGR composites are fabricated via a two-step method,including the impregnation of Fe^(3+)and the reduction process.The influence of the different loading capacities of the Fe component on the morphology and electromagnetic properties is studied.Moreover,the loading content of Fe and the surface morphology of the Fe/CGR can be reasonably controlled by adjusting the concentration of the ferric nitrate solution.Meanwhile,Fe particles are evenly inserted on the CGR framework,which expands the Fe/CGR interfaces to enhance interfacial polarization,thus further improving the microwave-absorbing(MA)properties of composites.Particularly,as the Fe^(3+)concentration is 1.0 mol/L,the Fe/CGR composite exhibits outstanding performance.The reflection loss reaches-39.3 dB at 2.5 mm,and the absorption bandwidth covers 4.1 GHz at 1.5 mm.In this study,facile processability,resource recycling,appropriately matched impedance,and excellent MA performance are achieved.Finally,the Fe/CGR composites not only enhance the recycling of the CGR but also pioneer a new path for the synthesis of excellent absorbents.展开更多
Through studying on the heating process of titanium microalloyed steels, the influence of heating temperature on the austenite grain size and the solid dissolution, precipitation law of Ti microalloying element were a...Through studying on the heating process of titanium microalloyed steels, the influence of heating temperature on the austenite grain size and the solid dissolution, precipitation law of Ti microalloying element were analyzed, and the results showed that, the austenite grain size increased with the increase of heating temperature, When the heating temperature reached 1050°C and 1250°C, the austenite grains appeared the obvious coarsening process twice. TiC particles dissolved gradually as the heating temperature increased. When the heating temperature rose to 1100°C, TiC particles disappeared basically, When the heating temperature rose to 1250°C, TiN particles began to be dissolved and grow up.展开更多
Increasing porosity is one of the most direct ways to improve the thermal insulation and dielectric properties of materials.Until now,many wet methods for preparing Si_(3)N_(4) ceramic foams usually face the problems ...Increasing porosity is one of the most direct ways to improve the thermal insulation and dielectric properties of materials.Until now,many wet methods for preparing Si_(3)N_(4) ceramic foams usually face the problems of complex rheology,long period,and expensive cost,and the reported pore sizes of Si_(3)N_(4) ceramic foams are typically micron-grade,resulting in a lack of competitiveness in thermal insulation and wave-transparent applications.In this paper,the Si_(3)N_(4)@SiO_(2) ceramic foams were prepared using an efficient dry-method,which combined three processes of low temperature chemical vapor deposition(LTCVD),template,and isostatic pressing.The method has the advantages of simple operation and short preparation period,and can realize near-net size molding and mass production.In addition,the evolution mechanisms of honeycomb microstructure and composition of Si_(3)N_(4)@SiO_(2) ceramic foam during sintering were studied by chemical reaction thermodynamics.The as-prepared Si_(3)N_(4)@SiO_(2) ceramic foam possesses low density(0.377 g·cm^(-3)),high compressive strength(7.5 MPa),low thermal conductivity(0.0808 W·m^(-1)·K^(-1)),and excellent dielectric properties(ε<1.32,tanδ<0.009)in the frequency range of 8-18 GHz,and its maximum working temperature in air can reach up to 1100℃.It will be recommended to be applied in the interlayer of Si_(3)N_(4) ceramic radome to improve its thermal insulation and electromagnetic wave transparency performances.展开更多
To the editor,Pancreatic ductal adenocarcinoma(PDAC)has the worst prognosis among all common malignant solid tumors,with a 5-year overall survival(OS)rate of less than 10%[1].Few effective targets for anticancer ther-...To the editor,Pancreatic ductal adenocarcinoma(PDAC)has the worst prognosis among all common malignant solid tumors,with a 5-year overall survival(OS)rate of less than 10%[1].Few effective targets for anticancer ther-apy have been confirmed in pancreatic cancer.Recently,it was substantiated that pancreatic cancer patients carry-ing deleterious mutations of the DNA damage response(DDR)genes are more likely to benefit from platinum-based chemotherapy[2]and poly(adenosine diphosphate-ribose)polymerase(PARP)inhibitor[3].展开更多
基金supported by the National Nature Science Foundation of China(No.51802212)the National College Students’Innovation and Entrepreneurship Training Program(No.2021465)+2 种基金the Natural Science Foundation of Shanxi Province,China(No.201801D221119)the Open Foundation of China-Belarus Belt and Road Joint Laboratory on Electromagnetic Environment Effect(Nos.ZBKF2022030802 and ZBKF2022030702)the Graduate Education Innovation Programs of Taiyuan University of Science and Technology(No.XCX212003)。
文摘Under the background of a transformation of the global energy structure,coal gasification technology has a wide application prospect,but its by-product,the coal gasification residue(CGR),is still not being efficiently utilized for recycling.The CGR contains abundant carbon components,which could be applied to the microwave absorption field as the carbon matrix.In this study,Fe/CGR composites are fabricated via a two-step method,including the impregnation of Fe^(3+)and the reduction process.The influence of the different loading capacities of the Fe component on the morphology and electromagnetic properties is studied.Moreover,the loading content of Fe and the surface morphology of the Fe/CGR can be reasonably controlled by adjusting the concentration of the ferric nitrate solution.Meanwhile,Fe particles are evenly inserted on the CGR framework,which expands the Fe/CGR interfaces to enhance interfacial polarization,thus further improving the microwave-absorbing(MA)properties of composites.Particularly,as the Fe^(3+)concentration is 1.0 mol/L,the Fe/CGR composite exhibits outstanding performance.The reflection loss reaches-39.3 dB at 2.5 mm,and the absorption bandwidth covers 4.1 GHz at 1.5 mm.In this study,facile processability,resource recycling,appropriately matched impedance,and excellent MA performance are achieved.Finally,the Fe/CGR composites not only enhance the recycling of the CGR but also pioneer a new path for the synthesis of excellent absorbents.
文摘Through studying on the heating process of titanium microalloyed steels, the influence of heating temperature on the austenite grain size and the solid dissolution, precipitation law of Ti microalloying element were analyzed, and the results showed that, the austenite grain size increased with the increase of heating temperature, When the heating temperature reached 1050°C and 1250°C, the austenite grains appeared the obvious coarsening process twice. TiC particles dissolved gradually as the heating temperature increased. When the heating temperature rose to 1100°C, TiC particles disappeared basically, When the heating temperature rose to 1250°C, TiN particles began to be dissolved and grow up.
基金supported by the Special Project of Science and Technology Cooperation and Exchange of Shanxi Province(No.202204041101014)the National Key Research and Development Program of China(No.2023YFB3811302)+1 种基金the Jinzhong University Research Funds for Doctor(No.JUD2023014)the Shanxi Provincial Key Research and Development Project(No.2022ZDYF027).
文摘Increasing porosity is one of the most direct ways to improve the thermal insulation and dielectric properties of materials.Until now,many wet methods for preparing Si_(3)N_(4) ceramic foams usually face the problems of complex rheology,long period,and expensive cost,and the reported pore sizes of Si_(3)N_(4) ceramic foams are typically micron-grade,resulting in a lack of competitiveness in thermal insulation and wave-transparent applications.In this paper,the Si_(3)N_(4)@SiO_(2) ceramic foams were prepared using an efficient dry-method,which combined three processes of low temperature chemical vapor deposition(LTCVD),template,and isostatic pressing.The method has the advantages of simple operation and short preparation period,and can realize near-net size molding and mass production.In addition,the evolution mechanisms of honeycomb microstructure and composition of Si_(3)N_(4)@SiO_(2) ceramic foam during sintering were studied by chemical reaction thermodynamics.The as-prepared Si_(3)N_(4)@SiO_(2) ceramic foam possesses low density(0.377 g·cm^(-3)),high compressive strength(7.5 MPa),low thermal conductivity(0.0808 W·m^(-1)·K^(-1)),and excellent dielectric properties(ε<1.32,tanδ<0.009)in the frequency range of 8-18 GHz,and its maximum working temperature in air can reach up to 1100℃.It will be recommended to be applied in the interlayer of Si_(3)N_(4) ceramic radome to improve its thermal insulation and electromagnetic wave transparency performances.
基金supported by a senior investigator LWW’s fundings from the Innovation Group Project of Shanghai Municipal Health Commission(2019CXJQ03),National Natural Science Foundation of China(81874048),Shang-haiMunicipal Commission of Health and Family Planning(2018ZHYL0223),Fostering Fund of Renji Hospital affili-ated to Shanghai Jiao Tong University School of Medicine(PYIV-17-001),Shanghai Municipal Commission of Health and Family Planning Grant(2018ZHYL0223),Clinical Research Plan of SHDC(No.SHDC2020CR1035B),Shang-hai Key Clinical Speciality(Oncology),Shanghai leading talents project,Innovative research teamof high-level local universities in Shanghai.Also supported by XFZ’s grant from Clinical plus Excellence Project(2020ZYA003)from Shanghai Nucleic Acid Chemistry and Nanomedicine Key Laboratory.
文摘To the editor,Pancreatic ductal adenocarcinoma(PDAC)has the worst prognosis among all common malignant solid tumors,with a 5-year overall survival(OS)rate of less than 10%[1].Few effective targets for anticancer ther-apy have been confirmed in pancreatic cancer.Recently,it was substantiated that pancreatic cancer patients carry-ing deleterious mutations of the DNA damage response(DDR)genes are more likely to benefit from platinum-based chemotherapy[2]and poly(adenosine diphosphate-ribose)polymerase(PARP)inhibitor[3].
