This paper discusses the lexical approach in college English teaching and learning. The lexical approach can help students learn to use English in an idiomatic way rather than in a Chinese way which may cause misunder...This paper discusses the lexical approach in college English teaching and learning. The lexical approach can help students learn to use English in an idiomatic way rather than in a Chinese way which may cause misunderstanding or confusion of native English speakers. As for the college English Teaching in China, the lexical approach works better than the traditional word-based teaching and learning. It can help students to learn ＂real＂ or ＂authentic＂ English and improve the students＇ ability to use English in all-around way.展开更多
This paper just focuses on introducing the new model and testing its effectiveness in teaching English. Within this new model, both in-class learning and out-of-class learning are emphasized. In this paper, an experim...This paper just focuses on introducing the new model and testing its effectiveness in teaching English. Within this new model, both in-class learning and out-of-class learning are emphasized. In this paper, an experimental study is conducted upon non-English majors to test the effectiveness of autonomous-cooperative teaching and learning model for college English teaching (CET). The experimental study has lasted for half a year. Finally, from the experiment it can prove that the autonomous-cooperative teaching and learning model is feasible for English teaching and learning in large English classes in Higher Vocational College. It can improve English Teaching of Higher Vocational College and the students in the EG would surpass those in the CG in the performance of English learning.展开更多
In today’s society,English has become a core competency that everyone needs.How to use the development advantages of“Internet+”and to develop a hybrid teaching method is the main research content of this paper.Base...In today’s society,English has become a core competency that everyone needs.How to use the development advantages of“Internet+”and to develop a hybrid teaching method is the main research content of this paper.Based on this,this paper firstly summarizes the problems existing in the mixed teaching mode of vocational English from the aspects of single multimedia teaching form and the utilization rate of modern information teaching tools.Subsequently,combining traditional classroom teaching with flipped classes based on microlecture,developing mixed-English teaching,establishing a self-learning environment for students under the network platform,and proposing suggestions are the guidance for students to use the online platform for independent learning,in order to be able to provides new ideas for higher vocational English mixed teaching reform.展开更多
with the rapid development of hi-tech at present, the college English curriculum teaching of higher education in our country faces an inevitable deep reform and innovation. In order to effectively improve the English ...with the rapid development of hi-tech at present, the college English curriculum teaching of higher education in our country faces an inevitable deep reform and innovation. In order to effectively improve the English application ability of undergraduates, this paper analyzes the integration of interpersonal teaching and man-machine teaching in college English, illustrates the connotation and the current situation of interpersonal and man-machine teaching and makes deep research of integration of these two teaching modes. The author proposes to fully exert the features and advantages of interpersonal teaching and multi-media teaching and hopes to improve the teaching quality of college English through the analysis and research of this paper.展开更多
In the current English curriculum,there are quite a few practical examples of such lively teachings as games and scene. English teachers are also employing vital and interesting pedagogies to stimulate students' i...In the current English curriculum,there are quite a few practical examples of such lively teachings as games and scene. English teachers are also employing vital and interesting pedagogies to stimulate students' imagination and to improve their ability to communicate in English. However,there are scarce examples to report successful incorporation of drama into teaching. Hence,the goal of this paper is to integrate communicative pedagogy,multiple intelligence,and whole language teaching to drama teaching,so as to obtain the best complementary effects of both in theory.展开更多
Grounded in educational ecology and constructivist theory,this study examines the challenges and opportunities faced by English teachers in the Gene AI era.While Gene AI is efficient in surface-level tasks,it has limi...Grounded in educational ecology and constructivist theory,this study examines the challenges and opportunities faced by English teachers in the Gene AI era.While Gene AI is efficient in surface-level tasks,it has limitations in cultural interpretation,ethical guidance,and metacognitive development.The paper proposes a tripartite framework for role transformation:cognitive reframing,pedagogical innovation,and ethical repositioning to help tackle the problem of functional substitution anxiety due to AI’s encroachment on traditional roles.The study concludes that English teachers must evolve into“intelligent curators”who can synergize AI’s technical prowess with human wisdom,prioritizing holistic human development over skill acquisition.展开更多
In this article,we study the approximate controllability of neutral partial differential equations with Hilfer fractional derivative and not instantaneous impulses effects.By using the Sadovskii's fixed point theo...In this article,we study the approximate controllability of neutral partial differential equations with Hilfer fractional derivative and not instantaneous impulses effects.By using the Sadovskii's fixed point theorem,fractional calculus and resolvent operator functions,we prove the approximate controllability of the considered system.展开更多
Objective:To summarize evidence on the prevention and management of intradialytic hypotension in maintenance hemodialysis patients,providing reference for clinical practice.Method:Chinese and English databases,guideli...Objective:To summarize evidence on the prevention and management of intradialytic hypotension in maintenance hemodialysis patients,providing reference for clinical practice.Method:Chinese and English databases,guideline websites,and professional society websites were systematically searched for literature on intradialytic hypotension guidance,including clinical decisions,guidelines,evidence summaries,systematic reviews,and expert consensuses,from database inception to October 1,2024.Evidence was extracted after literature quality evaluation.Results:A total of 11 publications were included:2 clinical decisions,7 guidelines,1 systematic review,and 1 expert consensus.38 pieces of evidence were summarized across 4 themes:pre-dialysis assessment and prevention,monitoring and management during dialysis,medication use,and patient self-management.Conclusion:The best evidence for prevention and management of intradialytic hypotension in maintenance hemodialysis patients is scientific and comprehensive.Healthcare professionals are advised to apply this evidence judiciously in conjunction with clinical realities to ensure patient safety.展开更多
Based on the working principles of particle bed comminution, particles produced by high-pressure grinding rolls （HPGR） have surface properties different from particles produced by other grinding patterns, which exer...Based on the working principles of particle bed comminution, particles produced by high-pressure grinding rolls （HPGR） have surface properties different from particles produced by other grinding patterns, which exert great influence on mineral flotation. Flotation performances of calcite particles under different grinding patterns involving the use of HPGR, a jaw crusher, a dry ball mill, a wet ball mill, and a wet rod mill were studied using single mineral flotation tests. The surface properties of the particles under different grinding patterns were characterized to determine the flotation performance variation in terms of specific surface area, particle size distribution, AFM, XPS, and zeta potential. The results show that particles ground by HPGR exhibited improved flotation performance within the lower range of grinding fineness in both NaOL and dodecyl amine flotation systems compared to the particles prepared using other grinding patterns. Specific surface area, particle size distribution, surface roughness, Fe（III） contamination, binding energy, and zeta potential are greatly influenced by grinding patterns, which is the main cause of the flotation performance variation.展开更多
In order to deal with the disadvantages of excessive grinding and non-uniformity in finished particle under high-pressure grinding rolls （HPGR） finished grinding system, four aspects were investigated, including eva...In order to deal with the disadvantages of excessive grinding and non-uniformity in finished particle under high-pressure grinding rolls （HPGR） finished grinding system, four aspects were investigated, including evaluating indicators, effects of operating factors, effect of particle uniformity on the flotation and formation mechanism of particle uniformity. Experiment of HPGR finished grinding system, cationic reverse flotation experiment and simulation test of particle bed comminution under the condition of quasi-static were carried out. Theoretical analyses indicated that both of uniformity coefficient and average particle size should be included in the uniformity analysis of the mineral particles. The results show that the effect of circulation fan impeller speed on particle uniformity is the most evident, HPGR working pressure and roll gap are second and HPGR roller speed is the last. Average particle size has a more obvious effect on the grade of flotation concentrate while uniformity coefficient has a more obvious effect on the flotation recovery. Considering the two aspects of grade and recovery, the optimal uniformity coefficient for flotation is 1.1-1.2 and the optimal average particle size for flotation is 50-55 μm. The operating factors which promote the shielding effect and compact effect in the HPGR finished grinding system should be strengthened based on the uniformity of particles.展开更多
Cr^(3+)doped broadband near-infrared(NIR) emitting phosphors are currently the focus of research.Researchers have developed a variety of strategies to achieve broad and strong NIR emission,However,it is a conundrum to...Cr^(3+)doped broadband near-infrared(NIR) emitting phosphors are currently the focus of research.Researchers have developed a variety of strategies to achieve broad and strong NIR emission,However,it is a conundrum to simultaneously broaden and enhance the emission of Cr^(3+)with a single strategy,In this work,we solved this problem by co-doping Yb^(3+).Under 452 nm excitation,Ga_(1.4)In_(0.6)SnO_(5)(GISO):0.01Cr^(3+)shows ultrabroadband NIR emission covering 650-1300 nm with a peak of 884 nm,The full width half maximum(FWHM) of the emission is 215 nm and the internal quantum yield(IQY) is 25%.This indicates that the double sites occupation strategy is favorable to achieve ultra-broadband NIR emission.The co-doping of Yb^(3+)can effectively broaden and enhance the emission of Cr^(3+).The FWHM for GISO:0.01Cr^(3+),0.002Yb^(3+)extends to 245 nm,and the IQY increases to 28%.Further increasing the concentration of Yb^(3+)to 0.005,the IQY is lifted to 32%.Finally,a phosphor-co nverted light emitting diode(pc-LED) was prepared by integrating the GISO:0.01Cr^(3+),0.002Yb^(3+)with a blue light chip.Under the current drive of 40 mA,the maximum output power of pc-LED is 4.54 mW,and the photoelectric conversion efficiency is 4.12%.These results indicate that Yb^(3+)ions can simultaneously broaden the emission band and improve the emission efficiency.This work provides an effective strategy for the design of efficient broadband NIR phosphors in the future.展开更多
AIM: To determine the expression of c-Fos, caspase-3 and interleukin-1β (IL-1β) in the cervical cord and stomach of rats with cervical spondylosis, to analyze their relationship, and to offer an explanation of one p...AIM: To determine the expression of c-Fos, caspase-3 and interleukin-1β (IL-1β) in the cervical cord and stomach of rats with cervical spondylosis, to analyze their relationship, and to offer an explanation of one possible cause for functional dyspepsia (FD) and irritable bowel syndrome (IBS) caused by cervical spondylosis. METHODS: The cervical spondylosis model in rats was established by destroying the stability of cervical posterior column. The cord segments C4-6 and gastric antrum were collected 3 mo and 5 mo after the operation. Rats with the sham operation were used as controls. The expressions of c-Fos, caspase-3 and IL-1β in the cervical cord and gastric antrum were determined by immunohistochemistry and/or Western blot. RESULTS: Immunohistochemical staining showed a few c-Fos, caspase-3 and IL-1β-positive cells in the cervical cord and antrum in the control. There was a significant increase in c-Fos, caspase-3 and IL-1β expression in model groups compared to the control groups at 3 mo and 5 mo after operation. More importantly, there was a significant (P < 0.05) increase in c-Fos, caspase-3 and IL-1β expression in the model group rats at 3 mo compared to those at 5 mo after the operation (c-Fos: 11.20 ± 2.26 vs 27.68 ± 4.36 in the cervical cord, 11.3 ± 2.3 vs 29.3 ± 4.6 in the gastric antrum; caspase-3: 33.83 ± 3.71 vs 36.32 ± 4.01 in the cervical cord, 13.23 ± 3.21 vs 26.32 ± 4.01 in the gastric antrum; IL-1β: 42.06 ± 2.95 vs 45.91 ± 3.98 in the cervical cord, 26.56 ± 2.65 vs 32.01 ± 2.98 in the gastric antrum). Western blotanalysis showed time-dependent changes of caspase-3 and IL-1β protein in the cervical cord and gastric antrum of rats with cervical spondylosis; there was no significant expression of caspase-3 and IL-1β protein in the control group at 3 mo and 5 mo after the sham operation, whereas there was a significant difference in caspase-3 and IL-1β protein levels between the model group rats followed up for 3 mo and those for 5 mo (P < 0.05). CONCLUSION: There is a significant association of c-Fos, caspase-3 and IL-1β expressions in the gastric antrum with that in the spinal cord in rats with cervical spondylosis, suggesting that the gastrointestinal function may be affected by cervical spondylosis.展开更多
Based on the travelling wave method, a(2 + 1)-dimensional AKNS equation is considered. Elliptic solution and soliton solution are presented and it is shown that the soliton solution can be reduced from the elliptic so...Based on the travelling wave method, a(2 + 1)-dimensional AKNS equation is considered. Elliptic solution and soliton solution are presented and it is shown that the soliton solution can be reduced from the elliptic solution. It also proves that the result is consistent with the soliton solution of simplify Hirota bilinear method by Wazwaz and illustrate the solution are right travelling wave solution.展开更多
A double acid corrosion and subsequent hydrothermal treatment were used to fabricate a micro–nano-structured Ti substrates(Ti–M–N).Afterward,the mesoporous polydopamine(MPDA)nanoparticles as photothermal agent were...A double acid corrosion and subsequent hydrothermal treatment were used to fabricate a micro–nano-structured Ti substrates(Ti–M–N).Afterward,the mesoporous polydopamine(MPDA)nanoparticles as photothermal agent were prepared and immobilized on the surface of Ti–M–N samples,in order to obtain Ti–M–NMPDA sample.Unique micro–nanostructure properties and the photothermal effect of the modified Ti implant caused physical stress on the bacteria and the bacterial membrane damage,and eventually led to bacteria death.More importantly,based on excellent bioactivity and cytocompatibility of mussel-inspired materials,MPDA promoted adhesion,proliferation and osteogenic differentiation of mesenchymal stem cells in vitro.Furthermore,animal experiments in vivo further confirmed that the modified Ti implants could enhance osseointegration.展开更多
Eu3＋ and Ho3＋ doped Sr2TiO4 were synthesized by using solid-state reactions. Samples sintered at 1300 ℃ for 6 h could be indexed to Sr2TiO4 with a single phase. Eu3＋ in Sr2TiO4 emitted orange light under the excit...Eu3＋ and Ho3＋ doped Sr2TiO4 were synthesized by using solid-state reactions. Samples sintered at 1300 ℃ for 6 h could be indexed to Sr2TiO4 with a single phase. Eu3＋ in Sr2TiO4 emitted orange light under the excitation at 365 nm in a broad band which was coupled well with the strongest emission of high pressure mercury vapor lamps. Ho3＋ in Sr2TiO4 emitted yellow light under blue excitation from 450 to 460 nm which agreed well with the emission of blue InGaN-based light-emitting diodes. The present results indicated that Sr2TiO4 was a promis- ing host for high pressure mercury vapor lamps or white light-emitting diodes.展开更多
Software defect feature selection has problems of feature space dimensionality reduction and large search space.This research proposes a defect prediction feature selection framework based on improved shuffled frog le...Software defect feature selection has problems of feature space dimensionality reduction and large search space.This research proposes a defect prediction feature selection framework based on improved shuffled frog leaping algorithm(ISFLA).Using the two-level structure of the framework and the improved hybrid leapfrog algorithm's own advantages,the feature values are sorted,and some features with high correlation are selected to avoid other heuristic algorithms in the defect prediction that are easy to produce local The case where the convergence rate of the optimal or parameter optimization process is relatively slow.The framework improves generalization of predictions of unknown data samples and enhances the ability to search for features related to learning tasks.At the same time,this framework further reduces the dimension of the feature space.After the contrast simulation experiment with other common defect prediction methods,we used the actual test data set to verify the framework for multiple iterations on Internet of Things(IoT)system platform.The experimental results show that the software defect prediction feature selection framework based on ISFLA is very effective in defect prediction of IoT communication software.This framework can save the testing time of IoT communication software,effectively improve the performance of software defect prediction,and ensure the software quality.展开更多
A class of singularly perturbed Robin problems for reaction diffusion equation is considered. Under suitable conditions the asymptotic behavior of the generalized solution for the problems are studied.
The optical and physical properties of an InGaN light-emitting diode （LED） with a specific design of a staggered AlGaN electron-blocking layer （EBL） are investigated numerically in detail. The electrostatic field ...The optical and physical properties of an InGaN light-emitting diode （LED） with a specific design of a staggered AlGaN electron-blocking layer （EBL） are investigated numerically in detail. The electrostatic field distribution, energy band, carrier concentration, electroluminescence （EL） intensity, internal quantum efficiency （IQE）, and the output power are simulated. The results reveal that this specific design has a remarkable improvement in optical performance compared with the design of a conventional LED. The lower electron leakage current, higher hole injection efficiency, and consequently mitigated efficiency droop are achieved. The significant decrease of electrostatic field at the interface between the last barrier and the EBL of the LED could be one of the main reasons for these improvements.展开更多
文摘This paper discusses the lexical approach in college English teaching and learning. The lexical approach can help students learn to use English in an idiomatic way rather than in a Chinese way which may cause misunderstanding or confusion of native English speakers. As for the college English Teaching in China, the lexical approach works better than the traditional word-based teaching and learning. It can help students to learn ＂real＂ or ＂authentic＂ English and improve the students＇ ability to use English in all-around way.
文摘This paper just focuses on introducing the new model and testing its effectiveness in teaching English. Within this new model, both in-class learning and out-of-class learning are emphasized. In this paper, an experimental study is conducted upon non-English majors to test the effectiveness of autonomous-cooperative teaching and learning model for college English teaching (CET). The experimental study has lasted for half a year. Finally, from the experiment it can prove that the autonomous-cooperative teaching and learning model is feasible for English teaching and learning in large English classes in Higher Vocational College. It can improve English Teaching of Higher Vocational College and the students in the EG would surpass those in the CG in the performance of English learning.
文摘In today’s society,English has become a core competency that everyone needs.How to use the development advantages of“Internet+”and to develop a hybrid teaching method is the main research content of this paper.Based on this,this paper firstly summarizes the problems existing in the mixed teaching mode of vocational English from the aspects of single multimedia teaching form and the utilization rate of modern information teaching tools.Subsequently,combining traditional classroom teaching with flipped classes based on microlecture,developing mixed-English teaching,establishing a self-learning environment for students under the network platform,and proposing suggestions are the guidance for students to use the online platform for independent learning,in order to be able to provides new ideas for higher vocational English mixed teaching reform.
文摘with the rapid development of hi-tech at present, the college English curriculum teaching of higher education in our country faces an inevitable deep reform and innovation. In order to effectively improve the English application ability of undergraduates, this paper analyzes the integration of interpersonal teaching and man-machine teaching in college English, illustrates the connotation and the current situation of interpersonal and man-machine teaching and makes deep research of integration of these two teaching modes. The author proposes to fully exert the features and advantages of interpersonal teaching and multi-media teaching and hopes to improve the teaching quality of college English through the analysis and research of this paper.
基金supported by Foundation of Educational Commission of Guangdong Province (No.08JT019)the Foundation of Higher Vocational Education of Guangdong Province of China (No.GDGZ09029)
文摘In the current English curriculum,there are quite a few practical examples of such lively teachings as games and scene. English teachers are also employing vital and interesting pedagogies to stimulate students' imagination and to improve their ability to communicate in English. However,there are scarce examples to report successful incorporation of drama into teaching. Hence,the goal of this paper is to integrate communicative pedagogy,multiple intelligence,and whole language teaching to drama teaching,so as to obtain the best complementary effects of both in theory.
文摘Grounded in educational ecology and constructivist theory,this study examines the challenges and opportunities faced by English teachers in the Gene AI era.While Gene AI is efficient in surface-level tasks,it has limitations in cultural interpretation,ethical guidance,and metacognitive development.The paper proposes a tripartite framework for role transformation:cognitive reframing,pedagogical innovation,and ethical repositioning to help tackle the problem of functional substitution anxiety due to AI’s encroachment on traditional roles.The study concludes that English teachers must evolve into“intelligent curators”who can synergize AI’s technical prowess with human wisdom,prioritizing holistic human development over skill acquisition.
基金Supported by Shandong University of Finance and Economics 2023 International Collaborative Projectsthe National Natural Science Foundation of China(Grant No.62073190)。
文摘In this article,we study the approximate controllability of neutral partial differential equations with Hilfer fractional derivative and not instantaneous impulses effects.By using the Sadovskii's fixed point theorem,fractional calculus and resolvent operator functions,we prove the approximate controllability of the considered system.
文摘Objective:To summarize evidence on the prevention and management of intradialytic hypotension in maintenance hemodialysis patients,providing reference for clinical practice.Method:Chinese and English databases,guideline websites,and professional society websites were systematically searched for literature on intradialytic hypotension guidance,including clinical decisions,guidelines,evidence summaries,systematic reviews,and expert consensuses,from database inception to October 1,2024.Evidence was extracted after literature quality evaluation.Results:A total of 11 publications were included:2 clinical decisions,7 guidelines,1 systematic review,and 1 expert consensus.38 pieces of evidence were summarized across 4 themes:pre-dialysis assessment and prevention,monitoring and management during dialysis,medication use,and patient self-management.Conclusion:The best evidence for prevention and management of intradialytic hypotension in maintenance hemodialysis patients is scientific and comprehensive.Healthcare professionals are advised to apply this evidence judiciously in conjunction with clinical realities to ensure patient safety.
基金Project(2013EG132088)supported by Special Program for Research Institutes of the Ministry of Science and Technology,ChinaProject(12010402c187)supported by Key Science and Technology Program of Anhui Province,ChinaProject(GJKJ-14-89)supported by Science and Technology Program of Nanchang Institute of Science and Technology,China
文摘Based on the working principles of particle bed comminution, particles produced by high-pressure grinding rolls （HPGR） have surface properties different from particles produced by other grinding patterns, which exert great influence on mineral flotation. Flotation performances of calcite particles under different grinding patterns involving the use of HPGR, a jaw crusher, a dry ball mill, a wet ball mill, and a wet rod mill were studied using single mineral flotation tests. The surface properties of the particles under different grinding patterns were characterized to determine the flotation performance variation in terms of specific surface area, particle size distribution, AFM, XPS, and zeta potential. The results show that particles ground by HPGR exhibited improved flotation performance within the lower range of grinding fineness in both NaOL and dodecyl amine flotation systems compared to the particles prepared using other grinding patterns. Specific surface area, particle size distribution, surface roughness, Fe（III） contamination, binding energy, and zeta potential are greatly influenced by grinding patterns, which is the main cause of the flotation performance variation.
基金Project(2013EG132088)supported by Special Program for Research Institutes of the Ministry of Science and Technology,ChinaProject(12010402c187)supported by Key Science and Technology Program of Anhui Province,China
文摘In order to deal with the disadvantages of excessive grinding and non-uniformity in finished particle under high-pressure grinding rolls （HPGR） finished grinding system, four aspects were investigated, including evaluating indicators, effects of operating factors, effect of particle uniformity on the flotation and formation mechanism of particle uniformity. Experiment of HPGR finished grinding system, cationic reverse flotation experiment and simulation test of particle bed comminution under the condition of quasi-static were carried out. Theoretical analyses indicated that both of uniformity coefficient and average particle size should be included in the uniformity analysis of the mineral particles. The results show that the effect of circulation fan impeller speed on particle uniformity is the most evident, HPGR working pressure and roll gap are second and HPGR roller speed is the last. Average particle size has a more obvious effect on the grade of flotation concentrate while uniformity coefficient has a more obvious effect on the flotation recovery. Considering the two aspects of grade and recovery, the optimal uniformity coefficient for flotation is 1.1-1.2 and the optimal average particle size for flotation is 50-55 μm. The operating factors which promote the shielding effect and compact effect in the HPGR finished grinding system should be strengthened based on the uniformity of particles.
基金Project supported by the National Natural Science Foundation of China (62127816)the Guangdong Introducing Innovative and Entrepreneurial Teams of "The Pearl River Talent Recruitment Program"(2019ZT08X340)。
文摘Cr^(3+)doped broadband near-infrared(NIR) emitting phosphors are currently the focus of research.Researchers have developed a variety of strategies to achieve broad and strong NIR emission,However,it is a conundrum to simultaneously broaden and enhance the emission of Cr^(3+)with a single strategy,In this work,we solved this problem by co-doping Yb^(3+).Under 452 nm excitation,Ga_(1.4)In_(0.6)SnO_(5)(GISO):0.01Cr^(3+)shows ultrabroadband NIR emission covering 650-1300 nm with a peak of 884 nm,The full width half maximum(FWHM) of the emission is 215 nm and the internal quantum yield(IQY) is 25%.This indicates that the double sites occupation strategy is favorable to achieve ultra-broadband NIR emission.The co-doping of Yb^(3+)can effectively broaden and enhance the emission of Cr^(3+).The FWHM for GISO:0.01Cr^(3+),0.002Yb^(3+)extends to 245 nm,and the IQY increases to 28%.Further increasing the concentration of Yb^(3+)to 0.005,the IQY is lifted to 32%.Finally,a phosphor-co nverted light emitting diode(pc-LED) was prepared by integrating the GISO:0.01Cr^(3+),0.002Yb^(3+)with a blue light chip.Under the current drive of 40 mA,the maximum output power of pc-LED is 4.54 mW,and the photoelectric conversion efficiency is 4.12%.These results indicate that Yb^(3+)ions can simultaneously broaden the emission band and improve the emission efficiency.This work provides an effective strategy for the design of efficient broadband NIR phosphors in the future.
基金Supported by the Science Foundation of Chinese Post-doctor
文摘AIM: To determine the expression of c-Fos, caspase-3 and interleukin-1β (IL-1β) in the cervical cord and stomach of rats with cervical spondylosis, to analyze their relationship, and to offer an explanation of one possible cause for functional dyspepsia (FD) and irritable bowel syndrome (IBS) caused by cervical spondylosis. METHODS: The cervical spondylosis model in rats was established by destroying the stability of cervical posterior column. The cord segments C4-6 and gastric antrum were collected 3 mo and 5 mo after the operation. Rats with the sham operation were used as controls. The expressions of c-Fos, caspase-3 and IL-1β in the cervical cord and gastric antrum were determined by immunohistochemistry and/or Western blot. RESULTS: Immunohistochemical staining showed a few c-Fos, caspase-3 and IL-1β-positive cells in the cervical cord and antrum in the control. There was a significant increase in c-Fos, caspase-3 and IL-1β expression in model groups compared to the control groups at 3 mo and 5 mo after operation. More importantly, there was a significant (P < 0.05) increase in c-Fos, caspase-3 and IL-1β expression in the model group rats at 3 mo compared to those at 5 mo after the operation (c-Fos: 11.20 ± 2.26 vs 27.68 ± 4.36 in the cervical cord, 11.3 ± 2.3 vs 29.3 ± 4.6 in the gastric antrum; caspase-3: 33.83 ± 3.71 vs 36.32 ± 4.01 in the cervical cord, 13.23 ± 3.21 vs 26.32 ± 4.01 in the gastric antrum; IL-1β: 42.06 ± 2.95 vs 45.91 ± 3.98 in the cervical cord, 26.56 ± 2.65 vs 32.01 ± 2.98 in the gastric antrum). Western blotanalysis showed time-dependent changes of caspase-3 and IL-1β protein in the cervical cord and gastric antrum of rats with cervical spondylosis; there was no significant expression of caspase-3 and IL-1β protein in the control group at 3 mo and 5 mo after the sham operation, whereas there was a significant difference in caspase-3 and IL-1β protein levels between the model group rats followed up for 3 mo and those for 5 mo (P < 0.05). CONCLUSION: There is a significant association of c-Fos, caspase-3 and IL-1β expressions in the gastric antrum with that in the spinal cord in rats with cervical spondylosis, suggesting that the gastrointestinal function may be affected by cervical spondylosis.
文摘Based on the travelling wave method, a(2 + 1)-dimensional AKNS equation is considered. Elliptic solution and soliton solution are presented and it is shown that the soliton solution can be reduced from the elliptic solution. It also proves that the result is consistent with the soliton solution of simplify Hirota bilinear method by Wazwaz and illustrate the solution are right travelling wave solution.
基金This work was financially supported by the State Key Project of Research and Development(Nos.2016YFC1100300 and 2017YFB0702603)the National Natural Science Foundation of China(Nos.51825302,21734002 and 51673032).The Analytical and Testing Center of Chongqing University is greatly acknowledged for the help with the characterization of materials.
文摘A double acid corrosion and subsequent hydrothermal treatment were used to fabricate a micro–nano-structured Ti substrates(Ti–M–N).Afterward,the mesoporous polydopamine(MPDA)nanoparticles as photothermal agent were prepared and immobilized on the surface of Ti–M–N samples,in order to obtain Ti–M–NMPDA sample.Unique micro–nanostructure properties and the photothermal effect of the modified Ti implant caused physical stress on the bacteria and the bacterial membrane damage,and eventually led to bacteria death.More importantly,based on excellent bioactivity and cytocompatibility of mussel-inspired materials,MPDA promoted adhesion,proliferation and osteogenic differentiation of mesenchymal stem cells in vitro.Furthermore,animal experiments in vivo further confirmed that the modified Ti implants could enhance osseointegration.
基金Project supported by National Natural Science Foundation of China (21071034)
文摘Eu3＋ and Ho3＋ doped Sr2TiO4 were synthesized by using solid-state reactions. Samples sintered at 1300 ℃ for 6 h could be indexed to Sr2TiO4 with a single phase. Eu3＋ in Sr2TiO4 emitted orange light under the excitation at 365 nm in a broad band which was coupled well with the strongest emission of high pressure mercury vapor lamps. Ho3＋ in Sr2TiO4 emitted yellow light under blue excitation from 450 to 460 nm which agreed well with the emission of blue InGaN-based light-emitting diodes. The present results indicated that Sr2TiO4 was a promis- ing host for high pressure mercury vapor lamps or white light-emitting diodes.
基金This work was supported by Liaoning Natural Fund Guidance Plan Project(No.20180550021)Dalian Science and Technology Star Project(No.2017RQ021)2019 Qingdao Binhai University-level Science and Technology Plan Research Project(No.2019KY09).
文摘Software defect feature selection has problems of feature space dimensionality reduction and large search space.This research proposes a defect prediction feature selection framework based on improved shuffled frog leaping algorithm(ISFLA).Using the two-level structure of the framework and the improved hybrid leapfrog algorithm's own advantages,the feature values are sorted,and some features with high correlation are selected to avoid other heuristic algorithms in the defect prediction that are easy to produce local The case where the convergence rate of the optimal or parameter optimization process is relatively slow.The framework improves generalization of predictions of unknown data samples and enhances the ability to search for features related to learning tasks.At the same time,this framework further reduces the dimension of the feature space.After the contrast simulation experiment with other common defect prediction methods,we used the actual test data set to verify the framework for multiple iterations on Internet of Things(IoT)system platform.The experimental results show that the software defect prediction feature selection framework based on ISFLA is very effective in defect prediction of IoT communication software.This framework can save the testing time of IoT communication software,effectively improve the performance of software defect prediction,and ensure the software quality.
基金Supported by the National Natural Science Foundation of China(11371248)the Natural Science Foundation of the Education Department of Anhui Province 3(KJ2013A133,KJ2013B003)the Natural Science Foundation of Zhejiang Province(LY13A010005)
文摘A class of singularly perturbed Robin problems for reaction diffusion equation is considered. Under suitable conditions the asymptotic behavior of the generalized solution for the problems are studied.
基金Project supported by the National Natural Science Foundation of China (Grant No. 61176043)the Fund for Strategic and Emerging Industries of Guangdong Province, China (Grant No. 2010A081002005)the Project of Combination of Production and Research Guided by Ministry of Education, China (Grant No. 2010B090400192)
文摘The optical and physical properties of an InGaN light-emitting diode （LED） with a specific design of a staggered AlGaN electron-blocking layer （EBL） are investigated numerically in detail. The electrostatic field distribution, energy band, carrier concentration, electroluminescence （EL） intensity, internal quantum efficiency （IQE）, and the output power are simulated. The results reveal that this specific design has a remarkable improvement in optical performance compared with the design of a conventional LED. The lower electron leakage current, higher hole injection efficiency, and consequently mitigated efficiency droop are achieved. The significant decrease of electrostatic field at the interface between the last barrier and the EBL of the LED could be one of the main reasons for these improvements.
