Static charges on optical ant-counterfeiting membranes may lead to materials structural changes,dust stain aggravation,and misreading of optical information.Incorporating conductive particles is a common way to transf...Static charges on optical ant-counterfeiting membranes may lead to materials structural changes,dust stain aggravation,and misreading of optical information.Incorporating conductive particles is a common way to transfer accumulative charges,but the key issue is how to achieve high dispersion and effective distribution of particles.According to the strategy of assembly-induced structural colors,cellulose nanocrystals(CNCS)were employed as a solid emulsifier to stabilize hydrophobic carbon nanoparticles(CNPs)in aqueous media;subsequently.by solvent evaporation-modulated co-assembly under a condition of 30°C and 20 RH%,the binary suspensions containing 2wt% CNC and CNPs with the equivalent concentration relative to CNC ranged from 1:40 to 1:10 were used to prepare antistatic composite membranes.Surface chemistry regulation of CNCs was applied to optimize the dispersiblity of CNPs and the orientation of assembled CNC arrays,and the hydrophilic CNCS were more favorable for dispersion and assembly of binary suspension systems.Meanwhile,one dimension carbon nanotube(CNT)and zero-dimension carbon black(CB)were found to show better dispersibility than two dimension graphene,which was verified by a semi-quantitative theoretical study.Moreover,the stable binary systems of CNT/CNC and CB/CNC were chosen for co-assembly as membranes,and the uniaxial orientation could be optimized as the fll-width of 9.8°at half maximum deviation angle while the surface resistivity could also drop down to 3.42 × 102 Qcmcm-1.The structural color character of such paper homology and antistatic integrated membranes contributes to optical information hiding and-reading,and shows great potential as optical mark recognition materials for electrostatic discharge protective packaging and anti.counterfeiting applications.展开更多
This paper presents a wide-bandwidth back-illuminated modified uni-traveling-carrier photodiode(MUTC-PD)packaged with standard WR-5 rectangular waveguide for high-speed wireless communications.With optimized epitaxy s...This paper presents a wide-bandwidth back-illuminated modified uni-traveling-carrier photodiode(MUTC-PD)packaged with standard WR-5 rectangular waveguide for high-speed wireless communications.With optimized epitaxy structure and coplanar waveguide electrodes,the fabricated 4-μm-diameter PD exhibits ultra-flat frequency response and high saturation power.Integrated passive circuits including low-loss bias-tee and E-plane probe are designed to package the PD into a compact module with waveguide output.The packaged PD module has demonstrated a flat frequency response with fluctuations within±2.75 d B over a broadband of 140–220 GHz and a high saturated output power of-7.8 d Bm(166μW)at 140 GHz.For wireless communication applications,the packaged PD is used to implement 1-m free space transmission at carrier frequencies of 150.5 and 210.5 GHz,with transmission rates of 75 and 90 Gbps,respectively.展开更多
Growth of gallium nitride(GaN)inverted pyramids on c-plane sapphire substrates is benefit for fabricating novel devices as it forms the semipolar facets.In this work,GaN inverted pyramids are directly grown on c-plane...Growth of gallium nitride(GaN)inverted pyramids on c-plane sapphire substrates is benefit for fabricating novel devices as it forms the semipolar facets.In this work,GaN inverted pyramids are directly grown on c-plane patterned sapphire substrates(PSS)by metal organic vapor phase epitaxy(MOVPE).The influences of growth conditions on the surface morphol-ogy are experimentally studied and explained by Wulff constructions.The competition of growth rate among{0001},{1011},and{1122}facets results in the various surface morphologies of GaN.A higher growth temperature of 985 ℃ and a lowerⅤ/Ⅲratio of 25 can expand the area of{}facets in GaN inverted pyramids.On the other hand,GaN inverted pyramids with almost pure{}facets are obtained by using a lower growth temperature of 930℃,a higherⅤ/Ⅲratio of 100,and PSS with pattern arrangement perpendicular to the substrate primary flat.展开更多
Background:Parathyroid cysts(PCs)are rare lesions that often resemble other cervical cystic conditions,making preoperative diagnosis challenging,especially in resource-limited settings.Methods:We report a case of a pa...Background:Parathyroid cysts(PCs)are rare lesions that often resemble other cervical cystic conditions,making preoperative diagnosis challenging,especially in resource-limited settings.Methods:We report a case of a parathyroid cyst diagnosed and treated at Chongqing University Fuling Hospital in 2020.Clinical presentation,imaging,cytological features,pathological fi ndings,diff erential diagnosis and management strategies were analyzed in conjunction with an updated review of the literature.Conclusion:PCs represent a rare subset of parathyroid lesions and are most often non-functioning.Their imaging and cytological characteristics frequently resemble those of thyroid cysts,which may lead to misdiagnosis.Mea-surement of parathyroid hormone levels in aspirated cyst fl uid is essential when a PC is suspected.Surgical excision remains the defi nitive treatment.This case underscores the diagnostic challenges and highlights the importance of heightened clinical awareness,particularly in primary and rural healthcare settings.展开更多
Background:Thyrolipoma is a rare benign thyroid neoplasm composed of mature adipocytes within a follicular adenoma.Most lesions are asymptomatic,though some may enlarge and compress adjacent structures.Methods:We repo...Background:Thyrolipoma is a rare benign thyroid neoplasm composed of mature adipocytes within a follicular adenoma.Most lesions are asymptomatic,though some may enlarge and compress adjacent structures.Methods:We report a 30-year-old man with an incidentally detected thyroid nodule.Ultrasound showed a well-circumscribed,hyperechoic lesion,and shear-wave elastography indicated medium to high stiff ness.The patient underwent right hemithyroidectomy,and histopathology confi rmed thyrolipoma.Conclusion:Surgical excision is curative,with excellent long-term outcomes and no reported malignant transformation.Advanced imaging can aid preoperative assessment,and regular follow-up is recommend-ed to monitor for recurrence or new lesions.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(Nos.51973175 and 51603171)the Project for Chongqing University Innovation Research Group(No.CXQT19008)+1 种基金the Chongqing Talent Plan for Innovation and Entrepreneurship Demonstration Team(No.CQYC201903243)the Key Laboratory of Polymeric Composite&Functional Materials of Ministry of Education(No.PCFM201605).
文摘Static charges on optical ant-counterfeiting membranes may lead to materials structural changes,dust stain aggravation,and misreading of optical information.Incorporating conductive particles is a common way to transfer accumulative charges,but the key issue is how to achieve high dispersion and effective distribution of particles.According to the strategy of assembly-induced structural colors,cellulose nanocrystals(CNCS)were employed as a solid emulsifier to stabilize hydrophobic carbon nanoparticles(CNPs)in aqueous media;subsequently.by solvent evaporation-modulated co-assembly under a condition of 30°C and 20 RH%,the binary suspensions containing 2wt% CNC and CNPs with the equivalent concentration relative to CNC ranged from 1:40 to 1:10 were used to prepare antistatic composite membranes.Surface chemistry regulation of CNCs was applied to optimize the dispersiblity of CNPs and the orientation of assembled CNC arrays,and the hydrophilic CNCS were more favorable for dispersion and assembly of binary suspension systems.Meanwhile,one dimension carbon nanotube(CNT)and zero-dimension carbon black(CB)were found to show better dispersibility than two dimension graphene,which was verified by a semi-quantitative theoretical study.Moreover,the stable binary systems of CNT/CNC and CB/CNC were chosen for co-assembly as membranes,and the uniaxial orientation could be optimized as the fll-width of 9.8°at half maximum deviation angle while the surface resistivity could also drop down to 3.42 × 102 Qcmcm-1.The structural color character of such paper homology and antistatic integrated membranes contributes to optical information hiding and-reading,and shows great potential as optical mark recognition materials for electrostatic discharge protective packaging and anti.counterfeiting applications.
基金supported in part by National Key Research and Development Program of China(No.2022YFB2803002)National Natural Science Foundation of China(Nos.62235005,62127814,62225405,61975093,61927811,61991443,61925104 and 61974080)Collaborative Innovation Centre of Solid-State Lighting and Energy-Saving Electronics.
文摘This paper presents a wide-bandwidth back-illuminated modified uni-traveling-carrier photodiode(MUTC-PD)packaged with standard WR-5 rectangular waveguide for high-speed wireless communications.With optimized epitaxy structure and coplanar waveguide electrodes,the fabricated 4-μm-diameter PD exhibits ultra-flat frequency response and high saturation power.Integrated passive circuits including low-loss bias-tee and E-plane probe are designed to package the PD into a compact module with waveguide output.The packaged PD module has demonstrated a flat frequency response with fluctuations within±2.75 d B over a broadband of 140–220 GHz and a high saturated output power of-7.8 d Bm(166μW)at 140 GHz.For wireless communication applications,the packaged PD is used to implement 1-m free space transmission at carrier frequencies of 150.5 and 210.5 GHz,with transmission rates of 75 and 90 Gbps,respectively.
基金the National Key Research and Development Program(2021YFA0716400)the National Natural Science Foundation of China(62225405,62350002,61991443)+1 种基金the Key R&D Project of Jiangsu Province,China(BE2020004)the Collaborative Innovation Centre of Solid-State Lighting and Energy-Saving Electronics.
文摘Growth of gallium nitride(GaN)inverted pyramids on c-plane sapphire substrates is benefit for fabricating novel devices as it forms the semipolar facets.In this work,GaN inverted pyramids are directly grown on c-plane patterned sapphire substrates(PSS)by metal organic vapor phase epitaxy(MOVPE).The influences of growth conditions on the surface morphol-ogy are experimentally studied and explained by Wulff constructions.The competition of growth rate among{0001},{1011},and{1122}facets results in the various surface morphologies of GaN.A higher growth temperature of 985 ℃ and a lowerⅤ/Ⅲratio of 25 can expand the area of{}facets in GaN inverted pyramids.On the other hand,GaN inverted pyramids with almost pure{}facets are obtained by using a lower growth temperature of 930℃,a higherⅤ/Ⅲratio of 100,and PSS with pattern arrangement perpendicular to the substrate primary flat.
基金supported by the Fuling District Science and Technology and Health Joint Medical Research Program(Chongqing)(grant number 2024KWLH008)the Fuling District Research Project(Chongqing)(grant number FLKJ,2024AAN3046).
文摘Background:Parathyroid cysts(PCs)are rare lesions that often resemble other cervical cystic conditions,making preoperative diagnosis challenging,especially in resource-limited settings.Methods:We report a case of a parathyroid cyst diagnosed and treated at Chongqing University Fuling Hospital in 2020.Clinical presentation,imaging,cytological features,pathological fi ndings,diff erential diagnosis and management strategies were analyzed in conjunction with an updated review of the literature.Conclusion:PCs represent a rare subset of parathyroid lesions and are most often non-functioning.Their imaging and cytological characteristics frequently resemble those of thyroid cysts,which may lead to misdiagnosis.Mea-surement of parathyroid hormone levels in aspirated cyst fl uid is essential when a PC is suspected.Surgical excision remains the defi nitive treatment.This case underscores the diagnostic challenges and highlights the importance of heightened clinical awareness,particularly in primary and rural healthcare settings.
基金supported by the Fuling District Science and Technology and Health Joint Medical Research Program(Chongqing)(grant number 2024KWLH008)the Fuling District Research Project(Chongqing)(grant number FLKJ,2024AAN3046).
文摘Background:Thyrolipoma is a rare benign thyroid neoplasm composed of mature adipocytes within a follicular adenoma.Most lesions are asymptomatic,though some may enlarge and compress adjacent structures.Methods:We report a 30-year-old man with an incidentally detected thyroid nodule.Ultrasound showed a well-circumscribed,hyperechoic lesion,and shear-wave elastography indicated medium to high stiff ness.The patient underwent right hemithyroidectomy,and histopathology confi rmed thyrolipoma.Conclusion:Surgical excision is curative,with excellent long-term outcomes and no reported malignant transformation.Advanced imaging can aid preoperative assessment,and regular follow-up is recommend-ed to monitor for recurrence or new lesions.
