Based on the high-accuracy data obtained from the GPS measurements carried out in 1992, 1995 and 1996, the isochronous active units with different kinematic property inside the North China area have been distinguished...Based on the high-accuracy data obtained from the GPS measurements carried out in 1992, 1995 and 1996, the isochronous active units with different kinematic property inside the North China area have been distinguished, 4 active units and 1 transition zone with distinct differential movement have been determined. They are Ordos-Yinshan unit, Yanshan unit, Shanxi-Hebei-Shandong (Jin-Ji-Lu) unit, Jiaodong-Liaoning-Shandong (Jiao-Liao-Lu) unit and Yanshan-Hebei (Yan-Ji) transition zone. The relative movements among the neighboring units in this period have been given. ① The compressive movement between Ordos-Yinshan unit and Yanshan unit is not obvious with an amount of 0.4(1.3 mm/a.②in-Ji-Lu unit moves E40(S off the Ordos-Yinshan unit and the magnitude is 4.4(1.0 mm/a. ③elative to the Yan-Ji transition zone of differential movement, Yanshan unit shifts W38(N with a value of 2.4(1.3 mm/a and Jin-Ji-Lu unit moves eastward 35( by south with an amount of 2.3(0.9 mm/a. ④Jin-Ji-Lu unit has a tensional left-lateral movement of 4.7(1.4 mm/a in the direction of E37(S relative to Yanshan unit. ⑤ Some area near Tanlu belt which is located in the southern part of Jin-Ji-Lu block has a southward movement 14( by west with a magnitude of 1.5(1.1 mm/a off the Jin-Ji-Lu unit. ⑥ Relative to Jin-Ji-Lu unit, Jiao-Liao-Lu unit has a trend of clockwise movement with a tensional right-lateral motion at the north end which neighbors Yanshan unit and a compressive motion at the south end. It should be noted that the errors given in the paper are obtained based on the divergence among the displacements of the sites in the unit, rather than the value calculated from the displacement error of the sites. The analyzed results indicate that: ① Shanxi tectonic zone and Yan-Ji transition zone are the major tectonic active zones to show the frame and magnitude of interior relative movement in North China area, and others are the secondary tectonic active zones; ② The complete horizontal deformation in the North China area is not homogeneous nor successive; ③ The kinetic model of North China area might be (mantle dragging plus boundary coupling(.展开更多
The key to achieving nonlinear optical(NLO)crystals with superior optical properties lies in the development of new high-performance functional units and their precise arrangement.In this study,we identify the polar c...The key to achieving nonlinear optical(NLO)crystals with superior optical properties lies in the development of new high-performance functional units and their precise arrangement.In this study,we identify the polar covalent tetrahedron(PO_(3)NH_(3))^(-),with its remarkable optical properties,as a novel deep-ultraviolet(DUV)NLO-active unit for the first time.展开更多
This study investigates the efficacy of the Mathematics Independent Learning Activity Practice and Play Unite Scheme(MILAPlus)as an instructional strategy to improve the proficiency levels of Grade 9 students in quadr...This study investigates the efficacy of the Mathematics Independent Learning Activity Practice and Play Unite Scheme(MILAPlus)as an instructional strategy to improve the proficiency levels of Grade 9 students in quadratic equations and functions through a study carried out at Quezon National High School.The research involved 116 Grade 9 students and utilized a quantitative approach,incorporating both pre-assessment and post-assessment measures.The research utilizes a quasi-experimental design,examining the academic performance of students before and after the introduction of MILAPlus.The pre-assessment establishes a baseline,and the subsequent post-assessment measures the impact of the instructional strategy.Statistical analyses,including t-tests,assess the significance of differences in mean scores and mean percentage scores,providing quantitative insights into the effectiveness of MILAPlus.Findings from the study revealed a statistically significant improvement in both mean scores and mean percentage scores after the utilization of MILAPlus,indicating enhanced proficiency in quadratic equations and functions.The Mean Proficiency Scores(MPS)also showed a substantial increase,demonstrating a marked improvement in overall proficiency levels among Grade 9 students.In light of the results,recommendations were given including the continued utilization of MILAPlus as an instructional strategy and aligning its development with prescribed learning competencies.Emphasizing the consistent adherence to policies and guidelines for MILAPlus implementation is suggested for sustaining positive effects on students’long-term performance in mathematics.This research contributes valuable insights into the practical application and effectiveness of MILAPlus within the context of Grade 9 mathematics education at Quezon National High School.展开更多
We report a series of redox-active bis(pincer)Pd(II)complexes in which the redox active units are based on either a diarylamido or a carbazolide framework.Compounds 1 and 2 contain two full diarylamido/bis(pincer)PNP ...We report a series of redox-active bis(pincer)Pd(II)complexes in which the redox active units are based on either a diarylamido or a carbazolide framework.Compounds 1 and 2 contain two full diarylamido/bis(pincer)PNP units connected either via an Ar–O–Ar linker(1)or an Ar–Ar bond(2).Compound 3 is a fused bis(pincer)where the two PNP units share an aromatic ring.展开更多
High anisotropy birefringent materials are urgently needed as essential elements for modern optical technology.The integration of organic π-conjugated moieties with inorganic active units produces hybrid materials ex...High anisotropy birefringent materials are urgently needed as essential elements for modern optical technology.The integration of organic π-conjugated moieties with inorganic active units produces hybrid materials exhibiting pronounced optical anisotropy and tunable birefringence characteristics.However,the exploration and development of materials exhibiting large birefringence present ongoing challenges.In this work,three new organic-inorganic hybrid polyiodides,namely,C_(4)H_(6)N_(3)I_(2),(C_(5)H7N2)I·I_(3) and(C_(5)H_(6)NO)_(2)I_(4),have been synthesized by a solution method.It has been established that the structures of all three compounds contain two types of polyiodide anions(I_(3)^(-)and I_(4)^(2-)),which are formed by different Ⅰ-Ⅰ bonds.It is noteworthy that C_(4)H_(6)N_(3)I_(2),(C_(5)H_(7)N_(2))I·I_(3),and(C_(5)H_(6)NO)_(2)I_(4) exhibit significant birefringence at 1064 nm,with calculated values of 1.384,0.829,and 0.891,respectively.Theoretical calculations indicate that the combination of linear polyiodide anions with appropriately arranged π-conjugated groups results in high optical anisotropy.This work demonstrates that polyiodides are promising candidates for the development of superior birefringent materials.展开更多
Recently,organic planarπ-conjugated groups have received increasing attention from researchers for the construction of linear/nonlinear optical crystals with excellent performance in the UV/DUV region.Compared with i...Recently,organic planarπ-conjugated groups have received increasing attention from researchers for the construction of linear/nonlinear optical crystals with excellent performance in the UV/DUV region.Compared with inorganic optically active units([BO_(3)]^(3-),[B_(3)O_(6)]^(3-),[CO_(3)]^(2-),and[NO_(3)]^(-)),organic planarπ-conjugated groups have larger microscopic hyperpolarizability and polarizability anisotropy,which enable the synthesis of birefringent crystals with large birefringence or NLO crystals with a high SHG response and large birefringence.展开更多
It is vital to recognize the intention of finger motions for human-machine interaction(HMI).The latest research focuses on fine myoelectric control through the decoding of neural motor unit action potential trains(MUA...It is vital to recognize the intention of finger motions for human-machine interaction(HMI).The latest research focuses on fine myoelectric control through the decoding of neural motor unit action potential trains(MUAPt) from high-density surface electromyographic(sEMG) signals.However,the existing EMG decoding algorithms rarely obtain the spatial matching relationship between decoded motion units(MU) and designated muscles,and the control interface can only recognize the trained hand gestures.In this study,a semi-supervised HMI based on MU-muscle matching(MMM) is proposed to recognize individual finger motions and even the untrained combined multi-finger actions.Through automatic channel selection from high-density s EMG signals,the optimal spatial positions to monitor the MU activation of finger muscles are determined.Finger tapping experiment is carried out on ten subjects,and the experimental results show that the proposed s EMG decomposition algorithm based on MMM can accurately identify single finger motions with an accuracy of 93.1%±1.4%,which is comparable to that of state-of-the-art pattern recognition methods.Furthermore,the MMM allows unsupervised recognizing the untrained combined multi-finger motions with an accuracy of 73%±3.8%.The outcomes of this study benefit the practical applications of HMI,such as controlling prosthetic hand and virtual keyboard.展开更多
Optically active binaphthyl units have been introduced onto the periphery of the phthalocyanine chromophores in phthalocyanine-porphyrin-fused oligomers,resulting in the first(R)-and(S)-enantiomers of Pc-Por-fused dim...Optically active binaphthyl units have been introduced onto the periphery of the phthalocyanine chromophores in phthalocyanine-porphyrin-fused oligomers,resulting in the first(R)-and(S)-enantiomers of Pc-Por-fused dimer 1 and trimer 2 with induced chirality nature.This represents the largest chiral tetrapyrrole-based conjugated system,to the best of our knowledge.Electronic absorption,MCD,and CD spectroscopic results in combination with theoretical calculations disclose the effective transfer of the chiral information from the binaphthyl groups to both the central tetrapyrrole-fused chromophores,indicating the effective delocalization of theπ-electron density over the fused systems due to the effective electronic communication between/among the tetrapyrrole chromophores.展开更多
基金The National Key Basic Research Project Mechanism and Prediction of Continental Earthquakes (G1998040700).
文摘Based on the high-accuracy data obtained from the GPS measurements carried out in 1992, 1995 and 1996, the isochronous active units with different kinematic property inside the North China area have been distinguished, 4 active units and 1 transition zone with distinct differential movement have been determined. They are Ordos-Yinshan unit, Yanshan unit, Shanxi-Hebei-Shandong (Jin-Ji-Lu) unit, Jiaodong-Liaoning-Shandong (Jiao-Liao-Lu) unit and Yanshan-Hebei (Yan-Ji) transition zone. The relative movements among the neighboring units in this period have been given. ① The compressive movement between Ordos-Yinshan unit and Yanshan unit is not obvious with an amount of 0.4(1.3 mm/a.②in-Ji-Lu unit moves E40(S off the Ordos-Yinshan unit and the magnitude is 4.4(1.0 mm/a. ③elative to the Yan-Ji transition zone of differential movement, Yanshan unit shifts W38(N with a value of 2.4(1.3 mm/a and Jin-Ji-Lu unit moves eastward 35( by south with an amount of 2.3(0.9 mm/a. ④Jin-Ji-Lu unit has a tensional left-lateral movement of 4.7(1.4 mm/a in the direction of E37(S relative to Yanshan unit. ⑤ Some area near Tanlu belt which is located in the southern part of Jin-Ji-Lu block has a southward movement 14( by west with a magnitude of 1.5(1.1 mm/a off the Jin-Ji-Lu unit. ⑥ Relative to Jin-Ji-Lu unit, Jiao-Liao-Lu unit has a trend of clockwise movement with a tensional right-lateral motion at the north end which neighbors Yanshan unit and a compressive motion at the south end. It should be noted that the errors given in the paper are obtained based on the divergence among the displacements of the sites in the unit, rather than the value calculated from the displacement error of the sites. The analyzed results indicate that: ① Shanxi tectonic zone and Yan-Ji transition zone are the major tectonic active zones to show the frame and magnitude of interior relative movement in North China area, and others are the secondary tectonic active zones; ② The complete horizontal deformation in the North China area is not homogeneous nor successive; ③ The kinetic model of North China area might be (mantle dragging plus boundary coupling(.
基金supported by the National Natural Science Foundation of China(Grant No.22222510,21975255,21921001,and 52302008)the Natural Science Foundation of Fujian Province(2023J02026)+1 种基金the Foundation of Fujian Science&Technology Innovation Laboratory(2021ZR202)the Self-deployment Project Research Program of Haixi Institutes,Chinese Academy of Sciences(CXZX-2022-JQ01).
文摘The key to achieving nonlinear optical(NLO)crystals with superior optical properties lies in the development of new high-performance functional units and their precise arrangement.In this study,we identify the polar covalent tetrahedron(PO_(3)NH_(3))^(-),with its remarkable optical properties,as a novel deep-ultraviolet(DUV)NLO-active unit for the first time.
文摘This study investigates the efficacy of the Mathematics Independent Learning Activity Practice and Play Unite Scheme(MILAPlus)as an instructional strategy to improve the proficiency levels of Grade 9 students in quadratic equations and functions through a study carried out at Quezon National High School.The research involved 116 Grade 9 students and utilized a quantitative approach,incorporating both pre-assessment and post-assessment measures.The research utilizes a quasi-experimental design,examining the academic performance of students before and after the introduction of MILAPlus.The pre-assessment establishes a baseline,and the subsequent post-assessment measures the impact of the instructional strategy.Statistical analyses,including t-tests,assess the significance of differences in mean scores and mean percentage scores,providing quantitative insights into the effectiveness of MILAPlus.Findings from the study revealed a statistically significant improvement in both mean scores and mean percentage scores after the utilization of MILAPlus,indicating enhanced proficiency in quadratic equations and functions.The Mean Proficiency Scores(MPS)also showed a substantial increase,demonstrating a marked improvement in overall proficiency levels among Grade 9 students.In light of the results,recommendations were given including the continued utilization of MILAPlus as an instructional strategy and aligning its development with prescribed learning competencies.Emphasizing the consistent adherence to policies and guidelines for MILAPlus implementation is suggested for sustaining positive effects on students’long-term performance in mathematics.This research contributes valuable insights into the practical application and effectiveness of MILAPlus within the context of Grade 9 mathematics education at Quezon National High School.
基金the Welch Foundation(grant A-1717 to O.V.O.)and the National Science Foundation(grant DMR-1654029 to L.F.)for support of this research.The。
文摘We report a series of redox-active bis(pincer)Pd(II)complexes in which the redox active units are based on either a diarylamido or a carbazolide framework.Compounds 1 and 2 contain two full diarylamido/bis(pincer)PNP units connected either via an Ar–O–Ar linker(1)or an Ar–Ar bond(2).Compound 3 is a fused bis(pincer)where the two PNP units share an aromatic ring.
基金supported by the National Natural Science Foundation of China(Grant No.21975062 and 52072109)the Natural Science Foundation of Hebei Province(E2023201017)the Excellent Youth Research Innovation Team of Hebei University(QNTD202403).
文摘High anisotropy birefringent materials are urgently needed as essential elements for modern optical technology.The integration of organic π-conjugated moieties with inorganic active units produces hybrid materials exhibiting pronounced optical anisotropy and tunable birefringence characteristics.However,the exploration and development of materials exhibiting large birefringence present ongoing challenges.In this work,three new organic-inorganic hybrid polyiodides,namely,C_(4)H_(6)N_(3)I_(2),(C_(5)H7N2)I·I_(3) and(C_(5)H_(6)NO)_(2)I_(4),have been synthesized by a solution method.It has been established that the structures of all three compounds contain two types of polyiodide anions(I_(3)^(-)and I_(4)^(2-)),which are formed by different Ⅰ-Ⅰ bonds.It is noteworthy that C_(4)H_(6)N_(3)I_(2),(C_(5)H_(7)N_(2))I·I_(3),and(C_(5)H_(6)NO)_(2)I_(4) exhibit significant birefringence at 1064 nm,with calculated values of 1.384,0.829,and 0.891,respectively.Theoretical calculations indicate that the combination of linear polyiodide anions with appropriately arranged π-conjugated groups results in high optical anisotropy.This work demonstrates that polyiodides are promising candidates for the development of superior birefringent materials.
基金supported by the National Natural Science Foundation of China(22335007 and 22361132544)the Xinjiang Major Science and Technology Project(2021A01001).
文摘Recently,organic planarπ-conjugated groups have received increasing attention from researchers for the construction of linear/nonlinear optical crystals with excellent performance in the UV/DUV region.Compared with inorganic optically active units([BO_(3)]^(3-),[B_(3)O_(6)]^(3-),[CO_(3)]^(2-),and[NO_(3)]^(-)),organic planarπ-conjugated groups have larger microscopic hyperpolarizability and polarizability anisotropy,which enable the synthesis of birefringent crystals with large birefringence or NLO crystals with a high SHG response and large birefringence.
基金supported in part by the China National Key R&D Program(Grant No.2018YFB1307200)the National Natural Science Foundation of China (Grant Nos.51905339&91948302)。
文摘It is vital to recognize the intention of finger motions for human-machine interaction(HMI).The latest research focuses on fine myoelectric control through the decoding of neural motor unit action potential trains(MUAPt) from high-density surface electromyographic(sEMG) signals.However,the existing EMG decoding algorithms rarely obtain the spatial matching relationship between decoded motion units(MU) and designated muscles,and the control interface can only recognize the trained hand gestures.In this study,a semi-supervised HMI based on MU-muscle matching(MMM) is proposed to recognize individual finger motions and even the untrained combined multi-finger actions.Through automatic channel selection from high-density s EMG signals,the optimal spatial positions to monitor the MU activation of finger muscles are determined.Finger tapping experiment is carried out on ten subjects,and the experimental results show that the proposed s EMG decomposition algorithm based on MMM can accurately identify single finger motions with an accuracy of 93.1%±1.4%,which is comparable to that of state-of-the-art pattern recognition methods.Furthermore,the MMM allows unsupervised recognizing the untrained combined multi-finger motions with an accuracy of 73%±3.8%.The outcomes of this study benefit the practical applications of HMI,such as controlling prosthetic hand and virtual keyboard.
基金support from the National Key Basic Research Program of China(Grant No.2013CB933402)the Natural Science Foundation of China(no.21290174,21401009,and 21631003)the Beijing Municipal Commission of Education,and the University of Science and Technology Beijing is gratefully acknowledged.
文摘Optically active binaphthyl units have been introduced onto the periphery of the phthalocyanine chromophores in phthalocyanine-porphyrin-fused oligomers,resulting in the first(R)-and(S)-enantiomers of Pc-Por-fused dimer 1 and trimer 2 with induced chirality nature.This represents the largest chiral tetrapyrrole-based conjugated system,to the best of our knowledge.Electronic absorption,MCD,and CD spectroscopic results in combination with theoretical calculations disclose the effective transfer of the chiral information from the binaphthyl groups to both the central tetrapyrrole-fused chromophores,indicating the effective delocalization of theπ-electron density over the fused systems due to the effective electronic communication between/among the tetrapyrrole chromophores.
