Using the theory of derivations on finitely generated and graded Lie algebras, we determine that derivations of the BMS-Weyl algebra are all inner. On this basis, it is proved that every 2-local derivation of the BMS-...Using the theory of derivations on finitely generated and graded Lie algebras, we determine that derivations of the BMS-Weyl algebra are all inner. On this basis, it is proved that every 2-local derivation of the BMS-Weyl algebra is a derivation.展开更多
In this paper,we discuss the related properties of some particular derivations in semihoops and give some characterizations of them.Then,we prove that every Heyting algebra is isomorphic to the algebra of all multipli...In this paper,we discuss the related properties of some particular derivations in semihoops and give some characterizations of them.Then,we prove that every Heyting algebra is isomorphic to the algebra of all multiplicative derivations and show that every Boolean algebra is isomorphic to the algebra of all implicative derivations.Finally,we show that the sets of multiplicative and implicative derivations on bounded regular idempotent semihoops are in oneto-one correspondence.展开更多
Cardiac arrest can lead to severe neurological impairment as a result of inflammation,mitochondrial dysfunction,and post-cardiopulmonary resuscitation neurological damage.Hypoxic preconditioning has been shown to impr...Cardiac arrest can lead to severe neurological impairment as a result of inflammation,mitochondrial dysfunction,and post-cardiopulmonary resuscitation neurological damage.Hypoxic preconditioning has been shown to improve migration and survival of bone marrow–derived mesenchymal stem cells and reduce pyroptosis after cardiac arrest,but the specific mechanisms by which hypoxia-preconditioned bone marrow–derived mesenchymal stem cells protect against brain injury after cardiac arrest are unknown.To this end,we established an in vitro co-culture model of bone marrow–derived mesenchymal stem cells and oxygen–glucose deprived primary neurons and found that hypoxic preconditioning enhanced the protective effect of bone marrow stromal stem cells against neuronal pyroptosis,possibly through inhibition of the MAPK and nuclear factor κB pathways.Subsequently,we transplanted hypoxia-preconditioned bone marrow–derived mesenchymal stem cells into the lateral ventricle after the return of spontaneous circulation in an 8-minute cardiac arrest rat model induced by asphyxia.The results showed that hypoxia-preconditioned bone marrow–derived mesenchymal stem cells significantly reduced cardiac arrest–induced neuronal pyroptosis,oxidative stress,and mitochondrial damage,whereas knockdown of the liver isoform of phosphofructokinase in bone marrow–derived mesenchymal stem cells inhibited these effects.To conclude,hypoxia-preconditioned bone marrow–derived mesenchymal stem cells offer a promising therapeutic approach for neuronal injury following cardiac arrest,and their beneficial effects are potentially associated with increased expression of the liver isoform of phosphofructokinase following hypoxic preconditioning.展开更多
Transfer RNA(tRNA)-derived fragments,a new type of tRNA-derived small RNA(tsRNA),can be cleaved from tRNA by enzymes to regulate target gene expression at the transcriptional and translational levels.tsRNAs are not on...Transfer RNA(tRNA)-derived fragments,a new type of tRNA-derived small RNA(tsRNA),can be cleaved from tRNA by enzymes to regulate target gene expression at the transcriptional and translational levels.tsRNAs are not only degradation fragments but also have biological functions,including those in immune inflammation,metabolic disorders,and cell death.tsRNA dysregulation is closely associated with multiple diseases,including various cancers and acute pancreatitis(AP).AP is a common gastrointestinal disease,and its incidence increases annually.AP development is associated with tsRNAs,which regulate cell injury and induce inflammation,especially pyroptosis and ferroptosis.Notably,serum tRF36 has the potential to serve as a non-invasive diagnostic biomarker and leads to pancreatic acinar cell ferroptosis causing inflammation to promote AP.We show the characteristics of tsRNAs and their diagnostic value and function in AP,and discuss the potential opportunities and challenges of using tsRNAs in clinical applications and research.展开更多
Pitch produced by the lique-faction of coal was divided into two frac-tions:soluble in toluene(TS)and insol-uble in toluene but soluble in pyridine(TI-PS),and their differences in molecu-lar structure and oxidation ac...Pitch produced by the lique-faction of coal was divided into two frac-tions:soluble in toluene(TS)and insol-uble in toluene but soluble in pyridine(TI-PS),and their differences in molecu-lar structure and oxidation activity were studied.Several different carbon materi-als were produced from them by oxida-tion in air(350℃,300 mL/min)fol-lowed by carbonization(1000℃ in Ar),and the effect of the cross-linked structure on their structure and sodium storage properties was investigated.The results showed that the two pitch fractions were obviously different after the air oxidation.The TS fraction with a low degree of condensation and abundant side chains had a stronger oxidation activity and thus introduced more cross-linked oxygen-containing functional groups C(O)―O which prevented carbon layer rearrangement during the carbonization.As a result,a disordered hard carbon with more defects was formed,which improved the electrochemical performance.Therefore,the carbon materials derived from TS(O-TS-1000)had an obvious disordered structure and a larger layer spacing,giving them better sodium storage perform-ance than those derived from the TI-PS fraction(O-TI-PS-1000).The specific capacity of O-TS-1000 was about 250 mAh/g at 20 mA/g,which was 1.67 times higher than that of O-TI-PS-1000(150 mAh/g).展开更多
Water contamination in areas of formal and informal polymetallic mining is a growing concern in the Peruvian highlands. At the same time, there are agricultural activities that use contaminated water from these rivers...Water contamination in areas of formal and informal polymetallic mining is a growing concern in the Peruvian highlands. At the same time, there are agricultural activities that use contaminated water from these rivers for irrigation. This could contaminate the agricultural products grown on these lands, such as potatoes. It is, therefore, necessary and a priority to determine the adsorption characteristics of these derivatives and to be able to use these natural adsorbents to decontaminate water contaminated with heavy metals.展开更多
In the past years, we established analytic expressions of various fractals and discussed Hölder derivatives of the expressions. Based on our earlier results, we will study the properties of harmonic functions on ...In the past years, we established analytic expressions of various fractals and discussed Hölder derivatives of the expressions. Based on our earlier results, we will study the properties of harmonic functions on a very important fractal, the Sierpinski gasket (SG). Our main result is that the harmonic function on SG satisfies a Hölder inequality of order α=ln35\ln2.展开更多
Autism spectrum disorder(ASD)is a complex neurodevelopmental disorder affecting over 2%of the global population,marked by social communication deficits and repetitive behaviors.Kabatas et al explored the efficacy and ...Autism spectrum disorder(ASD)is a complex neurodevelopmental disorder affecting over 2%of the global population,marked by social communication deficits and repetitive behaviors.Kabatas et al explored the efficacy and safety of Wharton’s jelly-derived mesenchymal stem cell(WJ-MSC)therapy in a 4-year-old child with ASD.Using the childhood autism rating scale and Denver II develop-mental screening test,significant improvements were seen after six WJ-MSC sessions,with no adverse events over 2 years.Despite promising results,the study’s single-case design limits generalizability.Larger,multi-center trials are needed to validate the findings and assess long-term effects of WJ-MSC therapy in ASD.展开更多
5-Hydroxymethylfurfural(HMF)and its oxidation derivatives have emerged as a bridge between biomass resources and the future energy industry.These renewable biomass resources can be transformed into a variety of value-...5-Hydroxymethylfurfural(HMF)and its oxidation derivatives have emerged as a bridge between biomass resources and the future energy industry.These renewable biomass resources can be transformed into a variety of value-added chemicals,thereby addressing the challenges posed by diminishing fossil fuel reserves and environmental concerns.The immobilization of catalysts represents an innovative method for the sustainable and efficient synthesis of HMF and its oxidation derivatives.This method not only enhances the yield and selectivity of the products but also allows for the optimization of the catalytic performance of immobilized catalysts through the strategic design of their supports.In this review,we provide an overview of the recent advancements in the technology of immobilized catalyst and its application in the synthesis of HMF and its oxidation derivatives,with a particular focus on the preparation and catalytic characteristics of these immobilized catalysts.Furthermore,we discuss potential future directions for the development of immobilized catalysts,including the preparation of high-performance immobilized catalysts,the exploration of their growth and catalytic mechanisms,and the economic implications of raw material utilization.This area of research presents both significant promise and considerable challenges.展开更多
Magnesium hydride(MgH_(2))is an important material for hydrogen(H_(2))storage and transportation owing to its high capacity and reversibility.However,its intrinsic properties have considerably limited its industrial a...Magnesium hydride(MgH_(2))is an important material for hydrogen(H_(2))storage and transportation owing to its high capacity and reversibility.However,its intrinsic properties have considerably limited its industrial application.In this study,the NiFe-800 catalyst as metal-organic framework(MOF)derivative was first utilized to promote the intrinsic properties of MgH_(2).Compared to pure MgH_(2),which releases1.24 wt%H_(2)in 60 min at 275℃,the MgH_(2)-10 NiFe-800 composite releases 5.85 wt%H_(2)in the same time.Even at a lower temperature of 250℃,the MgH_(2)-10 NiFe-800 composite releases 3.57 wt%H_(2),surpassing the performance of pure MgH_(2)at 275℃.Correspondingly,while pure MgH_(2)absorbs 2.08 wt%H_(2)in60 min at 125℃,the MgH_(2)-10 NiFe-800 composite absorbs 5.35 wt%H_(2)in just 1 min,Remarkably,the MgH_(2)-10 NiFe-800 composite absorbs 2.27 wt%H_(2)in 60 min at 50℃and 4.64 wt%H_(2)at 75℃.This indicates that MgH_(2)-10 NiFe-800 exhibits optimum performance with excellent kinetics at low temperatures.Furthermore,the capacity of the MgH_(2)-10 NiFe-800 composite remains largely stable after 10cycles.Moreover,the Mg_(2)Ni/Mg_(2)NiH_(4)acts as a"hydrogen pump",providing effective diffusion channels that enhance the kinetic process of the composite during cycling.Additionally,Fe0facilitates electron transfer and creates hydrogen diffusion channels and catalytic sites.Finally,carbon(C)effectively prevents particle agglomeration and maintains the cyclic stability of the composites.Consequently,the synergistic effects of Mg_(2)Ni/Mg_(2)NiH_(4),Fe^(0),and C considerably improve the kinetic properties and cycling stability of MgH_(2).This work offers an effective and valuable approach to improving the hydrogen storage efficiency in the commercial application of MgH_(2).展开更多
High-energy-density(HED)fuel(e.g.widely used JP-10 and RJ-4),featuring compact 3D polycyclic structure with high strain,is of critical importance for volume-limited military aircraft,since their high density and combu...High-energy-density(HED)fuel(e.g.widely used JP-10 and RJ-4),featuring compact 3D polycyclic structure with high strain,is of critical importance for volume-limited military aircraft,since their high density and combustion heat can provide more propulsion energy.To reduce the reliance on petroleum source,it is highly desirable to develop renewable alternatives for the production of strained polycyclic HED fuel,but which remains a big challenge because of the inaccessibility caused by the high strain,We herein demonstrate a three-step catalytic route towards highly strained C_(17)and C_(18)spirofuel with biomass feedstocks.The process includes catalytic aldol condensation of renewable cyclohexanone/cyclopentanone with benzaldehyde,catalytic spiro Diels-Alder(D-A)reaction of aldol adduct with isoprene,and catalytic hydrodeoxygenation.The key spiro D-A reaction is enabled by the catalysis of heterogeneous Lewis acidic ionic liquid.The chloroaluminate IL,formed by benign urea and AICl3,exhibits good catalytic performance and reusability for this step.An eventual hydrodeoxygenation(HDO)over Pd/C and H-Y produces strained tricyclic spirofuel with density>0.93 g/mL,combustion heat>41 MJ/L and freezing point<-40℃,which are better than the properties of tactical fuel RJ-4.Therefore,it is anticipated that the as-prepared renewable fuels have the potential to replace traditional petroleum-derived HED fuels.展开更多
Goji berry is a famous edible and medicinal substance around the world.In this research,15 phenylpropionyl phenylethylamine derivatives(1-15),in cluding one new compound(1),were separated and identified from g oji ber...Goji berry is a famous edible and medicinal substance around the world.In this research,15 phenylpropionyl phenylethylamine derivatives(1-15),in cluding one new compound(1),were separated and identified from g oji berry.All isolates were elucidated via ex tensive nuclear magnetic resonance spectral analyses and chemical techniques.Six known isolates were first obtained from Lycium genus.Six isolates were effectively split in to double chromatographic peaks accompanied by the basically identical areas,indicating they belong to racemates.The oxygen radical absorbance capacity(ORAC)experiment indicated that all isolates displayed a capacity of scavenging free radicals,and most of them exhibited higher ORAC than epigallocatechingallate.In ethanol/palmitic acid-established in vitro hepatocyte injury model,four phenylpropionyl phenylethylamine derivatives(1,2,9,and 15)significantly alleviated hepatocyte injury,among which compound 1 exerted the strongest protective activity.Notably,the hepatoprotective effect of compound 1 was further confirmed in ethanol-established liver damage mouse model,reflected by the reduction of lipid accumulation and the attenuation of pathological alteration.Combined with the in vitro results,the in vivo observations suggested that compound 1 suppressed cell apoptosis and the outburst of inflammation.Our findings provided first-hand evidence proving that goji berry-derived phenylpropionyl phenylethylamine derivatives hold a potential in treating alcoholic liver disease.展开更多
Through analyzing problems exist in the conceptual planning of Jiuzhouwa Eco-Wetland Park, the derivation process and approach of its core concepts were discussed.
Let F be a field and char F = p > 3. In this paper the derivation algebras of Lie superalgebras W and S of Cartan-type over F are determined by the calculating method.
To determine the optimal or near optimal parameters of PID controller with incomplete derivation, a novel design method based on differential evolution （DE） algorithm is presented. The controller is called DE-PID co...To determine the optimal or near optimal parameters of PID controller with incomplete derivation, a novel design method based on differential evolution （DE） algorithm is presented. The controller is called DE-PID controller. To overcome the disadvantages of the integral performance criteria in the frequency domain such as IAE, ISE, and ITSE, a new performance criterion in the time domain is proposed. The optimization procedures employing the DE algorithm to search the optimal or near optimal PID controller parameters of a control system are demonstrated in detail. Three typical control systems are chosen to test and evaluate the adaptation and robustness of the proposed DE-PID controller. The simulation results show that the proposed approach has superior features of easy implementation, stable convergence characteristic, and good computational efficiency. Compared with the ZN, GA, and ASA, the proposed design method is indeed more efficient and robust in improving the step response of a control system.展开更多
In this article,the authors obtain some results concerning derivations of finitely generated Lie color algebras and discuss the relation between skew derivation space SkDer（L）and central extension H^2（L,F）on some ...In this article,the authors obtain some results concerning derivations of finitely generated Lie color algebras and discuss the relation between skew derivation space SkDer（L）and central extension H^2（L,F）on some Lie color algebras.Meanwhile,they generalize the notion of double extension to quadratic Lie color algebras,a sufficient condition for a quadratic Lie color algebra to be a double extension and further properties are given.展开更多
A new and intelligent design method for PID controller with incomplete derivation is proposed based on the ant system algorithm ( ASA) . For a given control system with this kind of PID controller, a group of optimal ...A new and intelligent design method for PID controller with incomplete derivation is proposed based on the ant system algorithm ( ASA) . For a given control system with this kind of PID controller, a group of optimal PID controller parameters K p * , T i * , and T d * can be obtained by taking the overshoot, settling time, and steady-state error of the system's unit step response as the performance indexes and by use of our improved ant system algorithm. K p * , T i * , and T d * can be used in real-time control. This kind of controller is called the ASA-PID controller with incomplete derivation. To verify the performance of the ASA-PID controller, three different typical transfer functions were tested, and three existing typical tuning methods of PID controller parameters, including the Ziegler-Nichols method (ZN),the genetic algorithm (GA),and the simulated annealing (SA), were adopted for comparison. The simulation results showed that the ASA-PID controller can be used to control different objects and has better performance compared with the ZN-PID and GA-PID controllers, and comparable performance compared with the SA-PID controller.展开更多
Applying the parametric derivation method, Peierls energy and Peierls stress are calculated with a non-sinusoidal force law in the lattice theory, while the results obtained by the power-series expansion according to ...Applying the parametric derivation method, Peierls energy and Peierls stress are calculated with a non-sinusoidal force law in the lattice theory, while the results obtained by the power-series expansion according to sinusoidal law can be deduced as a limiting case of non- sinusoidal law. The simplified expressions of Peierls energy and Peierls stress are obtained for the limit of wide and narrow. Peierls energy and Peierls stress decrease monotonically with the factor of modification of force law. Present results can be used expediently for prediction of the correct order of magnitude of Peierls stress for materials.展开更多
We developed an HPLC method for analysis of the monosaccharide composition of fucoidans. The fucoidan was hydrolyzed into monosaccharides with 2 mol/L trifluoroacetic acid. Using ribose as the internal standard, the m...We developed an HPLC method for analysis of the monosaccharide composition of fucoidans. The fucoidan was hydrolyzed into monosaccharides with 2 mol/L trifluoroacetic acid. Using ribose as the internal standard, the monosaecharide derivatives, obtained with 1-Phenyl-3-methyl-5- pyrazolone （PMP）, were separated by reverse-phase HPLC using a gradient elution process, and monitored by ultraviolet detection at 245 nm. In the concentration range of 0.1-2.0 mmol/L, the peak area of each monosaccharide had a good linear relationship with its concentration （r^2〉0.998）. The average recoveries of mannose, rhamnose, glucuronic acid, glucose, galactose, xylose, and fucose were 86.2%, 95.1%, 62.5%, 102.0%, 94.8%, 66.6%, and 105.1%, respectively. This method was accurate and had good reproducibility and could be used to determine the monosaccharide contents of fucoidans.展开更多
In this paper, we prove that any nonlinear Jordan higher derivation on triangular algebras is an additive higher derivation. As a byproduct, we obtain that any nonlinear Jordan derivation on nest algebras over infinit...In this paper, we prove that any nonlinear Jordan higher derivation on triangular algebras is an additive higher derivation. As a byproduct, we obtain that any nonlinear Jordan derivation on nest algebras over infinite dimensional Hilbert suaces is inner.展开更多
基金National Natural Science Foundation of China(11971315)。
文摘Using the theory of derivations on finitely generated and graded Lie algebras, we determine that derivations of the BMS-Weyl algebra are all inner. On this basis, it is proved that every 2-local derivation of the BMS-Weyl algebra is a derivation.
基金Supported by the National Natural Science Foundation of China(12271319).
文摘In this paper,we discuss the related properties of some particular derivations in semihoops and give some characterizations of them.Then,we prove that every Heyting algebra is isomorphic to the algebra of all multiplicative derivations and show that every Boolean algebra is isomorphic to the algebra of all implicative derivations.Finally,we show that the sets of multiplicative and implicative derivations on bounded regular idempotent semihoops are in oneto-one correspondence.
基金supported by the Natural Science Fund of Fujian Province,No.2020J011058(to JK)the Project of Fujian Provincial Hospital for High-level Hospital Construction,No.2020HSJJ12(to JK)+1 种基金the Fujian Provincial Finance Department Special Fund,No.(2021)848(to FC)the Fujian Provincial Major Scientific and Technological Special Projects on Health,No.2022ZD01008(to FC).
文摘Cardiac arrest can lead to severe neurological impairment as a result of inflammation,mitochondrial dysfunction,and post-cardiopulmonary resuscitation neurological damage.Hypoxic preconditioning has been shown to improve migration and survival of bone marrow–derived mesenchymal stem cells and reduce pyroptosis after cardiac arrest,but the specific mechanisms by which hypoxia-preconditioned bone marrow–derived mesenchymal stem cells protect against brain injury after cardiac arrest are unknown.To this end,we established an in vitro co-culture model of bone marrow–derived mesenchymal stem cells and oxygen–glucose deprived primary neurons and found that hypoxic preconditioning enhanced the protective effect of bone marrow stromal stem cells against neuronal pyroptosis,possibly through inhibition of the MAPK and nuclear factor κB pathways.Subsequently,we transplanted hypoxia-preconditioned bone marrow–derived mesenchymal stem cells into the lateral ventricle after the return of spontaneous circulation in an 8-minute cardiac arrest rat model induced by asphyxia.The results showed that hypoxia-preconditioned bone marrow–derived mesenchymal stem cells significantly reduced cardiac arrest–induced neuronal pyroptosis,oxidative stress,and mitochondrial damage,whereas knockdown of the liver isoform of phosphofructokinase in bone marrow–derived mesenchymal stem cells inhibited these effects.To conclude,hypoxia-preconditioned bone marrow–derived mesenchymal stem cells offer a promising therapeutic approach for neuronal injury following cardiac arrest,and their beneficial effects are potentially associated with increased expression of the liver isoform of phosphofructokinase following hypoxic preconditioning.
基金Supported by the Central South University Innovation-Driven Research Programme,No.2023CXQD075。
文摘Transfer RNA(tRNA)-derived fragments,a new type of tRNA-derived small RNA(tsRNA),can be cleaved from tRNA by enzymes to regulate target gene expression at the transcriptional and translational levels.tsRNAs are not only degradation fragments but also have biological functions,including those in immune inflammation,metabolic disorders,and cell death.tsRNA dysregulation is closely associated with multiple diseases,including various cancers and acute pancreatitis(AP).AP is a common gastrointestinal disease,and its incidence increases annually.AP development is associated with tsRNAs,which regulate cell injury and induce inflammation,especially pyroptosis and ferroptosis.Notably,serum tRF36 has the potential to serve as a non-invasive diagnostic biomarker and leads to pancreatic acinar cell ferroptosis causing inflammation to promote AP.We show the characteristics of tsRNAs and their diagnostic value and function in AP,and discuss the potential opportunities and challenges of using tsRNAs in clinical applications and research.
文摘Pitch produced by the lique-faction of coal was divided into two frac-tions:soluble in toluene(TS)and insol-uble in toluene but soluble in pyridine(TI-PS),and their differences in molecu-lar structure and oxidation activity were studied.Several different carbon materi-als were produced from them by oxida-tion in air(350℃,300 mL/min)fol-lowed by carbonization(1000℃ in Ar),and the effect of the cross-linked structure on their structure and sodium storage properties was investigated.The results showed that the two pitch fractions were obviously different after the air oxidation.The TS fraction with a low degree of condensation and abundant side chains had a stronger oxidation activity and thus introduced more cross-linked oxygen-containing functional groups C(O)―O which prevented carbon layer rearrangement during the carbonization.As a result,a disordered hard carbon with more defects was formed,which improved the electrochemical performance.Therefore,the carbon materials derived from TS(O-TS-1000)had an obvious disordered structure and a larger layer spacing,giving them better sodium storage perform-ance than those derived from the TI-PS fraction(O-TI-PS-1000).The specific capacity of O-TS-1000 was about 250 mAh/g at 20 mA/g,which was 1.67 times higher than that of O-TI-PS-1000(150 mAh/g).
文摘Water contamination in areas of formal and informal polymetallic mining is a growing concern in the Peruvian highlands. At the same time, there are agricultural activities that use contaminated water from these rivers for irrigation. This could contaminate the agricultural products grown on these lands, such as potatoes. It is, therefore, necessary and a priority to determine the adsorption characteristics of these derivatives and to be able to use these natural adsorbents to decontaminate water contaminated with heavy metals.
文摘In the past years, we established analytic expressions of various fractals and discussed Hölder derivatives of the expressions. Based on our earlier results, we will study the properties of harmonic functions on a very important fractal, the Sierpinski gasket (SG). Our main result is that the harmonic function on SG satisfies a Hölder inequality of order α=ln35\ln2.
文摘Autism spectrum disorder(ASD)is a complex neurodevelopmental disorder affecting over 2%of the global population,marked by social communication deficits and repetitive behaviors.Kabatas et al explored the efficacy and safety of Wharton’s jelly-derived mesenchymal stem cell(WJ-MSC)therapy in a 4-year-old child with ASD.Using the childhood autism rating scale and Denver II develop-mental screening test,significant improvements were seen after six WJ-MSC sessions,with no adverse events over 2 years.Despite promising results,the study’s single-case design limits generalizability.Larger,multi-center trials are needed to validate the findings and assess long-term effects of WJ-MSC therapy in ASD.
文摘5-Hydroxymethylfurfural(HMF)and its oxidation derivatives have emerged as a bridge between biomass resources and the future energy industry.These renewable biomass resources can be transformed into a variety of value-added chemicals,thereby addressing the challenges posed by diminishing fossil fuel reserves and environmental concerns.The immobilization of catalysts represents an innovative method for the sustainable and efficient synthesis of HMF and its oxidation derivatives.This method not only enhances the yield and selectivity of the products but also allows for the optimization of the catalytic performance of immobilized catalysts through the strategic design of their supports.In this review,we provide an overview of the recent advancements in the technology of immobilized catalyst and its application in the synthesis of HMF and its oxidation derivatives,with a particular focus on the preparation and catalytic characteristics of these immobilized catalysts.Furthermore,we discuss potential future directions for the development of immobilized catalysts,including the preparation of high-performance immobilized catalysts,the exploration of their growth and catalytic mechanisms,and the economic implications of raw material utilization.This area of research presents both significant promise and considerable challenges.
基金financially supported by the Natural Science Foundation of Guangdong province(2024A1515010228)the Research and demonstration application of intelligent sensing technology for lithium ion battery energy storage(SPICXJ-HTBBC-2022-01).
文摘Magnesium hydride(MgH_(2))is an important material for hydrogen(H_(2))storage and transportation owing to its high capacity and reversibility.However,its intrinsic properties have considerably limited its industrial application.In this study,the NiFe-800 catalyst as metal-organic framework(MOF)derivative was first utilized to promote the intrinsic properties of MgH_(2).Compared to pure MgH_(2),which releases1.24 wt%H_(2)in 60 min at 275℃,the MgH_(2)-10 NiFe-800 composite releases 5.85 wt%H_(2)in the same time.Even at a lower temperature of 250℃,the MgH_(2)-10 NiFe-800 composite releases 3.57 wt%H_(2),surpassing the performance of pure MgH_(2)at 275℃.Correspondingly,while pure MgH_(2)absorbs 2.08 wt%H_(2)in60 min at 125℃,the MgH_(2)-10 NiFe-800 composite absorbs 5.35 wt%H_(2)in just 1 min,Remarkably,the MgH_(2)-10 NiFe-800 composite absorbs 2.27 wt%H_(2)in 60 min at 50℃and 4.64 wt%H_(2)at 75℃.This indicates that MgH_(2)-10 NiFe-800 exhibits optimum performance with excellent kinetics at low temperatures.Furthermore,the capacity of the MgH_(2)-10 NiFe-800 composite remains largely stable after 10cycles.Moreover,the Mg_(2)Ni/Mg_(2)NiH_(4)acts as a"hydrogen pump",providing effective diffusion channels that enhance the kinetic process of the composite during cycling.Additionally,Fe0facilitates electron transfer and creates hydrogen diffusion channels and catalytic sites.Finally,carbon(C)effectively prevents particle agglomeration and maintains the cyclic stability of the composites.Consequently,the synergistic effects of Mg_(2)Ni/Mg_(2)NiH_(4),Fe^(0),and C considerably improve the kinetic properties and cycling stability of MgH_(2).This work offers an effective and valuable approach to improving the hydrogen storage efficiency in the commercial application of MgH_(2).
基金supported by the Fundamental Research Funds for the Central Universities(2023QN1009)Xuzhou Basic Research Project(KC23018)+1 种基金China University of Mining and Technology(CUMT)Open Sharing Fund for Large-scale Instruments and Equipment(DYGX-2024-34)Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘High-energy-density(HED)fuel(e.g.widely used JP-10 and RJ-4),featuring compact 3D polycyclic structure with high strain,is of critical importance for volume-limited military aircraft,since their high density and combustion heat can provide more propulsion energy.To reduce the reliance on petroleum source,it is highly desirable to develop renewable alternatives for the production of strained polycyclic HED fuel,but which remains a big challenge because of the inaccessibility caused by the high strain,We herein demonstrate a three-step catalytic route towards highly strained C_(17)and C_(18)spirofuel with biomass feedstocks.The process includes catalytic aldol condensation of renewable cyclohexanone/cyclopentanone with benzaldehyde,catalytic spiro Diels-Alder(D-A)reaction of aldol adduct with isoprene,and catalytic hydrodeoxygenation.The key spiro D-A reaction is enabled by the catalysis of heterogeneous Lewis acidic ionic liquid.The chloroaluminate IL,formed by benign urea and AICl3,exhibits good catalytic performance and reusability for this step.An eventual hydrodeoxygenation(HDO)over Pd/C and H-Y produces strained tricyclic spirofuel with density>0.93 g/mL,combustion heat>41 MJ/L and freezing point<-40℃,which are better than the properties of tactical fuel RJ-4.Therefore,it is anticipated that the as-prepared renewable fuels have the potential to replace traditional petroleum-derived HED fuels.
基金funded via National Natural Science Foundation of China(81925037,82321004,U22A20371,and 82273801)Guangdong Major Project of Basic and Applied Basic Research(2023B0303000026)+6 种基金Guangdong International Science and Technology Cooperation Base(2021A0505020015)Innovative and Research Teams Project of Guangdong Higher Education Institution(2021KCXTD001)Guangdong Basic and Applied Basic Research Foundation(2022A1515012071)Young Elite Scientists Sponsorship Program by China Association of Chinese Medicine(2021-QNRC2-B21)Guangdong-Hong Kong-Macao Universities Joint Laboratory for the Internationalization of Traditional Chinese Medicine(2023LSYS002)Guangzhou Key Laboratory of Traditional Chinese Medicine&Disease Susceptibility(2024A03J090)Science and Technology Program of Guangzhou(201707010414,202201020066,and 2024A04J9955)。
文摘Goji berry is a famous edible and medicinal substance around the world.In this research,15 phenylpropionyl phenylethylamine derivatives(1-15),in cluding one new compound(1),were separated and identified from g oji berry.All isolates were elucidated via ex tensive nuclear magnetic resonance spectral analyses and chemical techniques.Six known isolates were first obtained from Lycium genus.Six isolates were effectively split in to double chromatographic peaks accompanied by the basically identical areas,indicating they belong to racemates.The oxygen radical absorbance capacity(ORAC)experiment indicated that all isolates displayed a capacity of scavenging free radicals,and most of them exhibited higher ORAC than epigallocatechingallate.In ethanol/palmitic acid-established in vitro hepatocyte injury model,four phenylpropionyl phenylethylamine derivatives(1,2,9,and 15)significantly alleviated hepatocyte injury,among which compound 1 exerted the strongest protective activity.Notably,the hepatoprotective effect of compound 1 was further confirmed in ethanol-established liver damage mouse model,reflected by the reduction of lipid accumulation and the attenuation of pathological alteration.Combined with the in vitro results,the in vivo observations suggested that compound 1 suppressed cell apoptosis and the outburst of inflammation.Our findings provided first-hand evidence proving that goji berry-derived phenylpropionyl phenylethylamine derivatives hold a potential in treating alcoholic liver disease.
文摘Through analyzing problems exist in the conceptual planning of Jiuzhouwa Eco-Wetland Park, the derivation process and approach of its core concepts were discussed.
文摘Let F be a field and char F = p > 3. In this paper the derivation algebras of Lie superalgebras W and S of Cartan-type over F are determined by the calculating method.
基金the National Natural Science Foundation of China (60375001)the Scientific Research Foundation of Hunan Provincial Education Department (05B016).
文摘To determine the optimal or near optimal parameters of PID controller with incomplete derivation, a novel design method based on differential evolution （DE） algorithm is presented. The controller is called DE-PID controller. To overcome the disadvantages of the integral performance criteria in the frequency domain such as IAE, ISE, and ITSE, a new performance criterion in the time domain is proposed. The optimization procedures employing the DE algorithm to search the optimal or near optimal PID controller parameters of a control system are demonstrated in detail. Three typical control systems are chosen to test and evaluate the adaptation and robustness of the proposed DE-PID controller. The simulation results show that the proposed approach has superior features of easy implementation, stable convergence characteristic, and good computational efficiency. Compared with the ZN, GA, and ASA, the proposed design method is indeed more efficient and robust in improving the step response of a control system.
基金National Natural Science Foundation of China(10271076)
文摘In this article,the authors obtain some results concerning derivations of finitely generated Lie color algebras and discuss the relation between skew derivation space SkDer（L）and central extension H^2（L,F）on some Lie color algebras.Meanwhile,they generalize the notion of double extension to quadratic Lie color algebras,a sufficient condition for a quadratic Lie color algebra to be a double extension and further properties are given.
基金This work was supported by the National Natural Science Foundation of China (No. 50275150)the Foundation of Robotics Laboratory, Chinese Academy of Sciences( No. RL200002).
文摘A new and intelligent design method for PID controller with incomplete derivation is proposed based on the ant system algorithm ( ASA) . For a given control system with this kind of PID controller, a group of optimal PID controller parameters K p * , T i * , and T d * can be obtained by taking the overshoot, settling time, and steady-state error of the system's unit step response as the performance indexes and by use of our improved ant system algorithm. K p * , T i * , and T d * can be used in real-time control. This kind of controller is called the ASA-PID controller with incomplete derivation. To verify the performance of the ASA-PID controller, three different typical transfer functions were tested, and three existing typical tuning methods of PID controller parameters, including the Ziegler-Nichols method (ZN),the genetic algorithm (GA),and the simulated annealing (SA), were adopted for comparison. The simulation results showed that the ASA-PID controller can be used to control different objects and has better performance compared with the ZN-PID and GA-PID controllers, and comparable performance compared with the SA-PID controller.
基金Project supported by the National Natural Science Foundation of China (No.10774196)the Science Foundation Project of CQ CSTC (No.2006BB4156)Chongqing University Postgraduates'Science and Innovation Fund (No.2007A1A0030240).
文摘Applying the parametric derivation method, Peierls energy and Peierls stress are calculated with a non-sinusoidal force law in the lattice theory, while the results obtained by the power-series expansion according to sinusoidal law can be deduced as a limiting case of non- sinusoidal law. The simplified expressions of Peierls energy and Peierls stress are obtained for the limit of wide and narrow. Peierls energy and Peierls stress decrease monotonically with the factor of modification of force law. Present results can be used expediently for prediction of the correct order of magnitude of Peierls stress for materials.
基金Supported by the Key Technology Research & Development Program of Shandong Province (No 2007GG1005007)
文摘We developed an HPLC method for analysis of the monosaccharide composition of fucoidans. The fucoidan was hydrolyzed into monosaccharides with 2 mol/L trifluoroacetic acid. Using ribose as the internal standard, the monosaecharide derivatives, obtained with 1-Phenyl-3-methyl-5- pyrazolone （PMP）, were separated by reverse-phase HPLC using a gradient elution process, and monitored by ultraviolet detection at 245 nm. In the concentration range of 0.1-2.0 mmol/L, the peak area of each monosaccharide had a good linear relationship with its concentration （r^2〉0.998）. The average recoveries of mannose, rhamnose, glucuronic acid, glucose, galactose, xylose, and fucose were 86.2%, 95.1%, 62.5%, 102.0%, 94.8%, 66.6%, and 105.1%, respectively. This method was accurate and had good reproducibility and could be used to determine the monosaccharide contents of fucoidans.
文摘In this paper, we prove that any nonlinear Jordan higher derivation on triangular algebras is an additive higher derivation. As a byproduct, we obtain that any nonlinear Jordan derivation on nest algebras over infinite dimensional Hilbert suaces is inner.
