The wavy interface for similar or the same metal explosive welding（EXW） and the universal mechanism of wavy interface formation in EXW were studied in this work. Based on a new established model, it was deduced that...The wavy interface for similar or the same metal explosive welding（EXW） and the universal mechanism of wavy interface formation in EXW were studied in this work. Based on a new established model, it was deduced that the evolution frequencies of the instability were constrained in a limited range. Then experiments of identical metal EXW were performed and welding interfaces were characterized for examining the final morphology. By calculating the fractal dimensions and multifractal spectra of welding interface, the fractal characteristics of interface were revealed and a quantitative description was achieved for EXW interface structure. Thus, the formation, evolution and final morphology of wavy interface were systemically researched.展开更多
The scanning electronic microscope and automated image analyzer are adopted to investigate the morphology of deposits formed during fiber bundle media filtration, which results in the discovery of the self—similarity...The scanning electronic microscope and automated image analyzer are adopted to investigate the morphology of deposits formed during fiber bundle media filtration, which results in the discovery of the self—similarity of the deposits. Then in this paper it is proposed that the deposits are a fractal structure. Moreover, the fractal dimension value is related to the filter performance. The higher the fractal dimension value, the higher the filtration efficiency, and the longer filtration cycle, but the development of the head loss is also faster.展开更多
Cephalic index(CI)is the percentage of biparietal diameter to the occipitofrontal diameter of the skull and can be used in forensic investigations in cases of disputed identity where only fragments of the head/skull a...Cephalic index(CI)is the percentage of biparietal diameter to the occipitofrontal diameter of the skull and can be used in forensic investigations in cases of disputed identity where only fragments of the head/skull are available.The sella turcica houses the pituitary gland whose hormones regulate the functions of many other glands and systems of the body.Abnormal sizes of sella turcica could indicate sella/pituitary pathology with health implications.This study aimed to assess CI,head shapes and sella turcica dimensions and morphology of the Yoruba tribe of Nigeria.The objectives are:to relate CI and head shapes with sella turcica dimensions and morphology,to use CI and head shape to identify and distinguish the Yoruba tribe from other tribes,to use CI and head shape to distinguish between genders.Skull/head and sella turcica dimensions were measured on 321 retrospectively enlisted normal cranial Computed Tomography(CT)images of Yoruba subjects,mean age 55(SD±17)years,in a Tertiary Hospital in South-West Nigeria between January 2020 and April 2021,and then CI calculated.Data was analyzed using IBM SPSS 27(IBM Corp.Armonk,NY,USA,2019).Predominant head shape of the studied group was dolichocephalic.Mean CI was 70.0±3.7 and showed no statistically significant difference between gender(P=0.097).Mean sella length,depth;and anteroposterior diameter was 1.22±0.24 cm,0.80±0.15 cm,1.34±0.25 cm respectively.Mean sella length and depth showed significant difference between gender(P=0.0001;P=0.032)respectively.Head shape has no association with sella dimensions and morphology.Head shape and CI may stratify populations in forensic practice and surgical planning.展开更多
Understanding the influence of electrode material’s morphology on electrochemical behavior is of great significance for the development of rechargeable batteries,however,such studies are often limited by the inabilit...Understanding the influence of electrode material’s morphology on electrochemical behavior is of great significance for the development of rechargeable batteries,however,such studies are often limited by the inability to precisely control the morphology of electrode materials.Herein,nanostructured titanium niobium oxides(TiNb_(2)O_(7))with three different morphologies(one-dimensional(1D),two-dimensional(2D),and three-dimensional(3D))were synthesized via a facile microwave-assisted solvothermal method.The influence of the morphological dimension of TiNb_(2)O_(7) as electrode material on the electrochemical performance in Li-ion batteries(LIBs)and the underlying correlation with the electrochemical kinetics were studied in detail.2D TiNb_(2)O_(7)(TNO-2D)shows a superior rate capability and cycling stability,associated with improved kinetics for charge transfer and Li-ion diffusion,compared to the 1D and 3D materials.Operando X-ray diffraction measurements reveal the structural stability and crystallographic evolution of TNO-2D upon lithiation and delithiation and correlate the Li-ion diffusion kinetics with the lattice evolution during battery charge and discharge.Moreover,carbon-coated TNO-2D achieves enhanced rate capability(205 mAh·g^(-1) at 50 C)and long-term cycling stability(87%after 1000 cycles at 5 C).This work provides insights into the rational morphology design of electrode materials for accelerated charge transfer and enhanced fast-charging capability,pushing forward the development of electrode materials for high-power rechargeable batteries in future energy storage.展开更多
基金Funded by the National Natural Science Foundation of China(Nos.11202093 and 11662010)
文摘The wavy interface for similar or the same metal explosive welding（EXW） and the universal mechanism of wavy interface formation in EXW were studied in this work. Based on a new established model, it was deduced that the evolution frequencies of the instability were constrained in a limited range. Then experiments of identical metal EXW were performed and welding interfaces were characterized for examining the final morphology. By calculating the fractal dimensions and multifractal spectra of welding interface, the fractal characteristics of interface were revealed and a quantitative description was achieved for EXW interface structure. Thus, the formation, evolution and final morphology of wavy interface were systemically researched.
文摘The scanning electronic microscope and automated image analyzer are adopted to investigate the morphology of deposits formed during fiber bundle media filtration, which results in the discovery of the self—similarity of the deposits. Then in this paper it is proposed that the deposits are a fractal structure. Moreover, the fractal dimension value is related to the filter performance. The higher the fractal dimension value, the higher the filtration efficiency, and the longer filtration cycle, but the development of the head loss is also faster.
文摘Cephalic index(CI)is the percentage of biparietal diameter to the occipitofrontal diameter of the skull and can be used in forensic investigations in cases of disputed identity where only fragments of the head/skull are available.The sella turcica houses the pituitary gland whose hormones regulate the functions of many other glands and systems of the body.Abnormal sizes of sella turcica could indicate sella/pituitary pathology with health implications.This study aimed to assess CI,head shapes and sella turcica dimensions and morphology of the Yoruba tribe of Nigeria.The objectives are:to relate CI and head shapes with sella turcica dimensions and morphology,to use CI and head shape to identify and distinguish the Yoruba tribe from other tribes,to use CI and head shape to distinguish between genders.Skull/head and sella turcica dimensions were measured on 321 retrospectively enlisted normal cranial Computed Tomography(CT)images of Yoruba subjects,mean age 55(SD±17)years,in a Tertiary Hospital in South-West Nigeria between January 2020 and April 2021,and then CI calculated.Data was analyzed using IBM SPSS 27(IBM Corp.Armonk,NY,USA,2019).Predominant head shape of the studied group was dolichocephalic.Mean CI was 70.0±3.7 and showed no statistically significant difference between gender(P=0.097).Mean sella length,depth;and anteroposterior diameter was 1.22±0.24 cm,0.80±0.15 cm,1.34±0.25 cm respectively.Mean sella length and depth showed significant difference between gender(P=0.0001;P=0.032)respectively.Head shape has no association with sella dimensions and morphology.Head shape and CI may stratify populations in forensic practice and surgical planning.
文摘Understanding the influence of electrode material’s morphology on electrochemical behavior is of great significance for the development of rechargeable batteries,however,such studies are often limited by the inability to precisely control the morphology of electrode materials.Herein,nanostructured titanium niobium oxides(TiNb_(2)O_(7))with three different morphologies(one-dimensional(1D),two-dimensional(2D),and three-dimensional(3D))were synthesized via a facile microwave-assisted solvothermal method.The influence of the morphological dimension of TiNb_(2)O_(7) as electrode material on the electrochemical performance in Li-ion batteries(LIBs)and the underlying correlation with the electrochemical kinetics were studied in detail.2D TiNb_(2)O_(7)(TNO-2D)shows a superior rate capability and cycling stability,associated with improved kinetics for charge transfer and Li-ion diffusion,compared to the 1D and 3D materials.Operando X-ray diffraction measurements reveal the structural stability and crystallographic evolution of TNO-2D upon lithiation and delithiation and correlate the Li-ion diffusion kinetics with the lattice evolution during battery charge and discharge.Moreover,carbon-coated TNO-2D achieves enhanced rate capability(205 mAh·g^(-1) at 50 C)and long-term cycling stability(87%after 1000 cycles at 5 C).This work provides insights into the rational morphology design of electrode materials for accelerated charge transfer and enhanced fast-charging capability,pushing forward the development of electrode materials for high-power rechargeable batteries in future energy storage.
