LiCoO_(2) is the preferred cathode material for consumer electronic products due to its high volumetric energy density. However, the unfavorable phase transition and surface oxygen release limits the practical applica...LiCoO_(2) is the preferred cathode material for consumer electronic products due to its high volumetric energy density. However, the unfavorable phase transition and surface oxygen release limits the practical application of LiCoO_(2)at a high-voltage of 4.6 V to achieve a higher energy density demanded by the market. Herein, both bulk and surface structures of LiCoO_(2)are stabilized at 4.6 V through oxygen charge regulation by Gd-gradient doping. The enrichment of highly electropositive Gd on LiCoO_(2) surface will increase the effective charge on oxygen and improve the oxygen framework stability against oxygen loss.On the other hand, Gd ions occupy the Co-sites and suppress the unfavorable phase transition and microcrack. The modified LiCoO_(2) exhibits superior cycling stability with capacity retention of 90.1% over 200 cycles at 4.6 V, and also obtains a high capacity of 145.7 m Ah/g at 5 C. This work shows great promise for developing high-voltage LiCoO_(2) at 4.6 V and the strategy could also contribute to optimizing other cathode materials with high voltage and large capacity, such as cobalt-free high-nickel and lithiumrich manganese-based cathode materials.展开更多
BACKGROUND Malignant proliferating trichilemmal tumor(MPTT)is an infrequent malignant neoplasm originating from cutaneous appendages,with only a handful of documented cases.This report delineates a unique instance of ...BACKGROUND Malignant proliferating trichilemmal tumor(MPTT)is an infrequent malignant neoplasm originating from cutaneous appendages,with only a handful of documented cases.This report delineates a unique instance of MPTT situated in the neck,accompanied by lymph node metastasis.A comprehensive exposition of its clinical trajectory and imaging manifestation is presented,aiming to enhance comprehension and management of this atypical ailment.CASE SUMMARY Patient concerns:A 79-year-old male presented with a longstanding right neck mass persisting for over six decades,exhibiting recent enlargement over the past year.Diagnoses:Enhanced magnetic resonance imaging of the neck unveiled an elliptical mass on the right neck side,characterized by an ill-defined border and a heterogeneous signal pattern.The mass exhibited subdued signal intensity on T1-weighted imaging(T1WI)and a heterogeneous high signal on T2-weighted imaging(T2WI),interspersed with a lengthy T1 and T2 cystic signal motif.Close anatomical association with the submandibular gland joint was noted,and intravenous gadolinium diethylene triamine pentaacetic acid administration facilitated conspicuous enhancement.Substantial enhancement of the solid segment prompted an initial preoperative diagnosis of malignant nerve sheath tumor.However,post-surgery histopathological and immunohistochemical analysis conclusively confirmed the diagnosis as malignant hyperplastic external hair root sheath tumor.Intervention:Complete excision of the tumor was successfully executed.Outcomes:The patient experienced a favorable postoperative recovery.CONCLUSION Malignant proliferative trichilemmal tumor external hair root sheath tumor is a cystic-solid lesion,appearing as low signal on T1WI images or high signal on T2WI with enhancement of the solid component.Suspicions of malignancy are heightened when the tumor border is indistinct,tissue planes are breached,or when linear or patchy high signals are observed in the subcutaneous tissue on T1 liver acquisition with volume acceleration enhanced images along with intermediate signal on T2WI and restricted diffusion on diffusion-weighted imaging images.Strong consideration for malignancy should arise if there are signs of compromised adjacent tissue relationships or direct invasion evident on imaging.We have incorporated the above-mentioned content into the entire manuscript.展开更多
Background:To report the clinical results and experiences of endoleak management and postoperative surveillance following endovascular repair of internal carotid artery vascular diseases(ICAVDs)using Willis covered st...Background:To report the clinical results and experiences of endoleak management and postoperative surveillance following endovascular repair of internal carotid artery vascular diseases(ICAVDs)using Willis covered stents.METHODS:Seventy-three patients with ICAVD who received Willis covered stent implantation between November 2013 and September 2018 were retrospectively reviewed.The clinical data of endoleak management and postoperative surveillance were analyzed.RESULTS:Seventy-three cases with ICAVD,including 57 aneurysms,11 carotid-cavernous sinus fistulas(CCF),and 5 surgical injuries,were all successfully installed with covered stents.Total isolation of ICAVDs was achieved in 59 patients(80.8%),and endoleaks were observed in 14 patients(19.2%).Of the 14 patients with endoleaks,12 had type I endoleaks and 2 had type II;13 had aneurysms and one had CCF.10 patients with type I endoleaks received balloon dilatation,and 7 of them underwent a second stent-graft implantation after then.One patient with type II endoleak received embolization of the branch artery,and another one received follow-up observation.Endoleaks resolved in 6 patients and were minimal in 5 patients after balloon dilatation or the second stent implantation.During the follow-up period,minor endoleaks spontaneously resolved in 4 patients and minimal endoleaks were still demonstrated in 4 patients without enlargement of residual lumen and rupture.CONCLUSIONS:Endoleaks are the major complication after endovascular repair of ICAVDs and represent one of the limitations of this procedure.Improving the understanding and management of endoleaks can be beneficial in the clinical setting,including the popularization and application of this technique.展开更多
为进一步提高高镍三元放电比容量,将充电截止电压从4.3 V提高到4.5/4.7 V,放电比容量可从200 mAh g^(-1)提高到230 mAh g^(-1),这对提高能量密度是非常有利的,但同时会导致界面稳定性进一步降低.本文在商业电解液(1 mol L^(-1)LiPF_(6)/...为进一步提高高镍三元放电比容量,将充电截止电压从4.3 V提高到4.5/4.7 V,放电比容量可从200 mAh g^(-1)提高到230 mAh g^(-1),这对提高能量密度是非常有利的,但同时会导致界面稳定性进一步降低.本文在商业电解液(1 mol L^(-1)LiPF_(6)/EC:DEC=1:1,体积比)基础上,加入双添加剂二氟草酸硼酸锂(LiDFOB)和三甲基硅基磷酸酯(TMSP),一方面形成富含F,B,Si等元素的无机组分界面膜增加高电压下界面稳定性;另一方面,TMSP中的Si-O键具有清除电解液中高腐蚀性HF的作用,以此增加电解液的稳定性.在成膜和除HF的双重作用下,抑制了4.5/4.7 V高截止电压下的界面反应、过渡金属溶出、表面相变及产气.组装的LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)/Li电池在4.5 V下具有800圈的循环寿命,在4.7 V下具有500圈的循环寿命.展开更多
本文采用球磨和喷雾干燥法,制备了类西瓜型可控内膨胀核-缓冲-壳结构Si/电化学剥离石墨烯/C(Si/EG/C)复合材料.在纳米硅和碳壳之间填充了含大量褶皱和空隙的EG,不仅缓冲了Si/EG/C颗粒内部硅的体积变化,还提供了锂离子的快速传输通道.凭...本文采用球磨和喷雾干燥法,制备了类西瓜型可控内膨胀核-缓冲-壳结构Si/电化学剥离石墨烯/C(Si/EG/C)复合材料.在纳米硅和碳壳之间填充了含大量褶皱和空隙的EG,不仅缓冲了Si/EG/C颗粒内部硅的体积变化,还提供了锂离子的快速传输通道.凭借这些优势,核-缓冲-壳结构的Si/EG/C表现出优异的电化学性能.半电池中Si/EG/C负极在100次循环后相对于初始容量没有下降(834 mA h g^(-1)).此外,Si/EG/C//LiCoO_(2)全电池在500次循环后相对于初始放电容量的容量保持率接近100%.这些结果表明Si/EG/C在下一代锂离子电池中具有潜在应用前景.展开更多
We propose a contraction transformation algorithm to plan a complete coverage trajectory for a mobile robot to ac-complish specific types of missions based on the Arnold dynamical system. First, we construct a chaotic...We propose a contraction transformation algorithm to plan a complete coverage trajectory for a mobile robot to ac-complish specific types of missions based on the Arnold dynamical system. First, we construct a chaotic mobile robot by com-bining the variable z of the Arnold equation and the kinematic equation of the robot. Second, we construct the candidate sets including the initial points with a relatively high coverage rate of the constructed mobile robot. Then the trajectory is contracted to the current position of the robot based on the designed contraction transformation strategy, to form a continuous complete cov-erage trajectory to execute the specific types of missions. Compared with the traditional method, the designed algorithm requires no obstacle avoidance to the boundary of the given workplace, possesses a high coverage rate, and keeps the chaotic characteristics of the produced coverage trajectory relatively unchanged, which enables the robot to accomplish special missions with features of completeness, randomness, or unpredictability.展开更多
Spatiotemporal continuity of surface water datasets widely known for its significance in the surface water dynamic monitoring and assessments,are faced with drawbacks like cloud influence,which hinders the direct extr...Spatiotemporal continuity of surface water datasets widely known for its significance in the surface water dynamic monitoring and assessments,are faced with drawbacks like cloud influence,which hinders the direct extraction of data from time-series remote sensing images.This study proposes a Time-series Surface Water Reconstruction method(TSWR).The initial stage of this method involves the effective use of remote sensing images to automatically construct multi-stage surface water boundaries based on Google Earth Engine(GEE).Then,we reconstructed regions the reconstruction of regions with missing water pixels using the distance relationship between the multi-stage water boundaries in previous and later periods.When applied to 10 large rivers around the world,this method yielded an overall accuracy of 98%for water extraction,an RMSE of 0.41 km2.Furthermore,time-series reconstruction tests conducted in 2020 on the Lancang and Danube rivers revealed a significant improvement in the image availability.These findings demonstrated that this method could not only be used to accurately reconstruct the surface water distribution missing water images,but also to depict a more pronounced time variation characteristic.The successful application of this method on GEE demonstrates its importance for use on large scales or in global studies.展开更多
Background The Catfish stent retriever is a newly developed mechanical thrombectomy device for rapid recanalisation in emergent large vessel occlusion(ELVO)stroke.The current trial aimed to assess whether the Catfish ...Background The Catfish stent retriever is a newly developed mechanical thrombectomy device for rapid recanalisation in emergent large vessel occlusion(ELVO)stroke.The current trial aimed to assess whether the Catfish stent retriever is non-inferior to the Solitaire stent retriever in terms of outcomes in ELVO stroke.Methods This was a randomised,prospective,parallel-group,multicentre,open-label,non-inferiority study conducted at 18 sites in China.The primary outcome was the proportion of cases with successful recanalisation(modified thrombolysis in cerebral infarction score of 2b or 3)following the procedure.Secondary efficacy outcomes included the National Institutes of Health Stroke Scale scores at 24 hours and 7 days or discharge if earlier,time from artery puncture to successful recanalisation and good clinical outcome(modified Rankin scale score≤2)at 90 days.Safety outcomes included symptomatic intracranial haemorrhage,all cause-death and severe adverse events at 90 days.Results Between 3 March 2019 and 5 June 2021,118 and 120 patients were randomly allocated to the Catfish and Solitaire groups,respectively.The primary endpoint after all endovascular procedures was non-inferior in the Catfish group(88.5%,100/113)than in the Solitaire group(87.7%,100/114),with a rate difference(RD)of 0.78%(95%CI-7.64 to-9.20;p=0.001).Sensitivity analysis only considering the per-protocol set also yielded similar results,with an RD of 0.83%(95%CI-7.03 to-8.70;p<0.001).Additionally,the proportions of cases with good clinical outcomes(47.8%vs 50.0%,p=0.739)and all-cause death rates(17.7%vs 18.8%,p=0.700)were similar in both groups at 90 days.Conclusions The Catfish stent retriever is an effective and safe device for endovascular recanalisation in ELVO stroke..展开更多
基金supported by the National Natural Science Foundation of China (52102249, 52172201, 51732005, 51902118)the China Postdoctoral Science Foundation (2019M662609 and 2020T130217)+1 种基金the international postdoctoral exchange fellowship program (PC2021026)the Major Technological Innovation Project of Hubei Province (2019AAA019) for financial support。
文摘LiCoO_(2) is the preferred cathode material for consumer electronic products due to its high volumetric energy density. However, the unfavorable phase transition and surface oxygen release limits the practical application of LiCoO_(2)at a high-voltage of 4.6 V to achieve a higher energy density demanded by the market. Herein, both bulk and surface structures of LiCoO_(2)are stabilized at 4.6 V through oxygen charge regulation by Gd-gradient doping. The enrichment of highly electropositive Gd on LiCoO_(2) surface will increase the effective charge on oxygen and improve the oxygen framework stability against oxygen loss.On the other hand, Gd ions occupy the Co-sites and suppress the unfavorable phase transition and microcrack. The modified LiCoO_(2) exhibits superior cycling stability with capacity retention of 90.1% over 200 cycles at 4.6 V, and also obtains a high capacity of 145.7 m Ah/g at 5 C. This work shows great promise for developing high-voltage LiCoO_(2) at 4.6 V and the strategy could also contribute to optimizing other cathode materials with high voltage and large capacity, such as cobalt-free high-nickel and lithiumrich manganese-based cathode materials.
文摘BACKGROUND Malignant proliferating trichilemmal tumor(MPTT)is an infrequent malignant neoplasm originating from cutaneous appendages,with only a handful of documented cases.This report delineates a unique instance of MPTT situated in the neck,accompanied by lymph node metastasis.A comprehensive exposition of its clinical trajectory and imaging manifestation is presented,aiming to enhance comprehension and management of this atypical ailment.CASE SUMMARY Patient concerns:A 79-year-old male presented with a longstanding right neck mass persisting for over six decades,exhibiting recent enlargement over the past year.Diagnoses:Enhanced magnetic resonance imaging of the neck unveiled an elliptical mass on the right neck side,characterized by an ill-defined border and a heterogeneous signal pattern.The mass exhibited subdued signal intensity on T1-weighted imaging(T1WI)and a heterogeneous high signal on T2-weighted imaging(T2WI),interspersed with a lengthy T1 and T2 cystic signal motif.Close anatomical association with the submandibular gland joint was noted,and intravenous gadolinium diethylene triamine pentaacetic acid administration facilitated conspicuous enhancement.Substantial enhancement of the solid segment prompted an initial preoperative diagnosis of malignant nerve sheath tumor.However,post-surgery histopathological and immunohistochemical analysis conclusively confirmed the diagnosis as malignant hyperplastic external hair root sheath tumor.Intervention:Complete excision of the tumor was successfully executed.Outcomes:The patient experienced a favorable postoperative recovery.CONCLUSION Malignant proliferative trichilemmal tumor external hair root sheath tumor is a cystic-solid lesion,appearing as low signal on T1WI images or high signal on T2WI with enhancement of the solid component.Suspicions of malignancy are heightened when the tumor border is indistinct,tissue planes are breached,or when linear or patchy high signals are observed in the subcutaneous tissue on T1 liver acquisition with volume acceleration enhanced images along with intermediate signal on T2WI and restricted diffusion on diffusion-weighted imaging images.Strong consideration for malignancy should arise if there are signs of compromised adjacent tissue relationships or direct invasion evident on imaging.We have incorporated the above-mentioned content into the entire manuscript.
基金supported by the Project from Shanghai Natural Science Fund Project(Grant no.19ZR1449000)Training Program of Shanghai Tongji hospital(Grant no.GJPY1812 and ITJ(ZD)1907)+1 种基金Shanghai“Rising Stars of Medical Talent”Youth Development Program(Grant no.[2019]72)Program of Outstanding Young Scientists of Tongji Hospital of Tongji University no.HBRC1808。
文摘Background:To report the clinical results and experiences of endoleak management and postoperative surveillance following endovascular repair of internal carotid artery vascular diseases(ICAVDs)using Willis covered stents.METHODS:Seventy-three patients with ICAVD who received Willis covered stent implantation between November 2013 and September 2018 were retrospectively reviewed.The clinical data of endoleak management and postoperative surveillance were analyzed.RESULTS:Seventy-three cases with ICAVD,including 57 aneurysms,11 carotid-cavernous sinus fistulas(CCF),and 5 surgical injuries,were all successfully installed with covered stents.Total isolation of ICAVDs was achieved in 59 patients(80.8%),and endoleaks were observed in 14 patients(19.2%).Of the 14 patients with endoleaks,12 had type I endoleaks and 2 had type II;13 had aneurysms and one had CCF.10 patients with type I endoleaks received balloon dilatation,and 7 of them underwent a second stent-graft implantation after then.One patient with type II endoleak received embolization of the branch artery,and another one received follow-up observation.Endoleaks resolved in 6 patients and were minimal in 5 patients after balloon dilatation or the second stent implantation.During the follow-up period,minor endoleaks spontaneously resolved in 4 patients and minimal endoleaks were still demonstrated in 4 patients without enlargement of residual lumen and rupture.CONCLUSIONS:Endoleaks are the major complication after endovascular repair of ICAVDs and represent one of the limitations of this procedure.Improving the understanding and management of endoleaks can be beneficial in the clinical setting,including the popularization and application of this technique.
基金supported by the National Natural Science Foundation of China(52172201,51732005,51902118,and 52102249)China Postdoctoral Science Foundation(2019M662609 and 2020T130217)。
文摘为进一步提高高镍三元放电比容量,将充电截止电压从4.3 V提高到4.5/4.7 V,放电比容量可从200 mAh g^(-1)提高到230 mAh g^(-1),这对提高能量密度是非常有利的,但同时会导致界面稳定性进一步降低.本文在商业电解液(1 mol L^(-1)LiPF_(6)/EC:DEC=1:1,体积比)基础上,加入双添加剂二氟草酸硼酸锂(LiDFOB)和三甲基硅基磷酸酯(TMSP),一方面形成富含F,B,Si等元素的无机组分界面膜增加高电压下界面稳定性;另一方面,TMSP中的Si-O键具有清除电解液中高腐蚀性HF的作用,以此增加电解液的稳定性.在成膜和除HF的双重作用下,抑制了4.5/4.7 V高截止电压下的界面反应、过渡金属溶出、表面相变及产气.组装的LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)/Li电池在4.5 V下具有800圈的循环寿命,在4.7 V下具有500圈的循环寿命.
基金supported by the National Key R&D Program of China(2018YFB0905400)the Key Laboratory Open Project of Guangdong Province(2018B030322001)the National Natural Science Foundation of China(52172201,51732005 and 11905081)。
文摘本文采用球磨和喷雾干燥法,制备了类西瓜型可控内膨胀核-缓冲-壳结构Si/电化学剥离石墨烯/C(Si/EG/C)复合材料.在纳米硅和碳壳之间填充了含大量褶皱和空隙的EG,不仅缓冲了Si/EG/C颗粒内部硅的体积变化,还提供了锂离子的快速传输通道.凭借这些优势,核-缓冲-壳结构的Si/EG/C表现出优异的电化学性能.半电池中Si/EG/C负极在100次循环后相对于初始容量没有下降(834 mA h g^(-1)).此外,Si/EG/C//LiCoO_(2)全电池在500次循环后相对于初始放电容量的容量保持率接近100%.这些结果表明Si/EG/C在下一代锂离子电池中具有潜在应用前景.
基金Project supported by the National Natural Science Foundation of China(Nos.61473179,61602280,and 61573213)the Natural Science Foundation of Shandong Province,China(Nos.ZR2017MF047,ZR2015CM016,and ZR2014FM007)the Shandong University of Technology&Zibo City Integration Development Project,China(No.2018ZBXC295)。
文摘We propose a contraction transformation algorithm to plan a complete coverage trajectory for a mobile robot to ac-complish specific types of missions based on the Arnold dynamical system. First, we construct a chaotic mobile robot by com-bining the variable z of the Arnold equation and the kinematic equation of the robot. Second, we construct the candidate sets including the initial points with a relatively high coverage rate of the constructed mobile robot. Then the trajectory is contracted to the current position of the robot based on the designed contraction transformation strategy, to form a continuous complete cov-erage trajectory to execute the specific types of missions. Compared with the traditional method, the designed algorithm requires no obstacle avoidance to the boundary of the given workplace, possesses a high coverage rate, and keeps the chaotic characteristics of the produced coverage trajectory relatively unchanged, which enables the robot to accomplish special missions with features of completeness, randomness, or unpredictability.
基金The research was funded by the National Natural Science Foundation of China[grant no 42171283]the Major Science and Technology Projects of Qinghai Province[grant no 2021-SF-A6]+1 种基金the Second Tibetan Plateau Scientific Expedition and Research Program(STEP)[grant number 2019QZKK0202]Strategic Priority Research Program of the Chinese Academy of Sciences[grant number XDA19090120].
文摘Spatiotemporal continuity of surface water datasets widely known for its significance in the surface water dynamic monitoring and assessments,are faced with drawbacks like cloud influence,which hinders the direct extraction of data from time-series remote sensing images.This study proposes a Time-series Surface Water Reconstruction method(TSWR).The initial stage of this method involves the effective use of remote sensing images to automatically construct multi-stage surface water boundaries based on Google Earth Engine(GEE).Then,we reconstructed regions the reconstruction of regions with missing water pixels using the distance relationship between the multi-stage water boundaries in previous and later periods.When applied to 10 large rivers around the world,this method yielded an overall accuracy of 98%for water extraction,an RMSE of 0.41 km2.Furthermore,time-series reconstruction tests conducted in 2020 on the Lancang and Danube rivers revealed a significant improvement in the image availability.These findings demonstrated that this method could not only be used to accurately reconstruct the surface water distribution missing water images,but also to depict a more pronounced time variation characteristic.The successful application of this method on GEE demonstrates its importance for use on large scales or in global studies.
文摘Background The Catfish stent retriever is a newly developed mechanical thrombectomy device for rapid recanalisation in emergent large vessel occlusion(ELVO)stroke.The current trial aimed to assess whether the Catfish stent retriever is non-inferior to the Solitaire stent retriever in terms of outcomes in ELVO stroke.Methods This was a randomised,prospective,parallel-group,multicentre,open-label,non-inferiority study conducted at 18 sites in China.The primary outcome was the proportion of cases with successful recanalisation(modified thrombolysis in cerebral infarction score of 2b or 3)following the procedure.Secondary efficacy outcomes included the National Institutes of Health Stroke Scale scores at 24 hours and 7 days or discharge if earlier,time from artery puncture to successful recanalisation and good clinical outcome(modified Rankin scale score≤2)at 90 days.Safety outcomes included symptomatic intracranial haemorrhage,all cause-death and severe adverse events at 90 days.Results Between 3 March 2019 and 5 June 2021,118 and 120 patients were randomly allocated to the Catfish and Solitaire groups,respectively.The primary endpoint after all endovascular procedures was non-inferior in the Catfish group(88.5%,100/113)than in the Solitaire group(87.7%,100/114),with a rate difference(RD)of 0.78%(95%CI-7.64 to-9.20;p=0.001).Sensitivity analysis only considering the per-protocol set also yielded similar results,with an RD of 0.83%(95%CI-7.03 to-8.70;p<0.001).Additionally,the proportions of cases with good clinical outcomes(47.8%vs 50.0%,p=0.739)and all-cause death rates(17.7%vs 18.8%,p=0.700)were similar in both groups at 90 days.Conclusions The Catfish stent retriever is an effective and safe device for endovascular recanalisation in ELVO stroke..