In this paper, the contents and various forms of Cd, Cu, Zn and Pb in the sediments of the Xiangjiang River have been investigated. The presentation of this paper focuses on the various forms and characteristics of th...In this paper, the contents and various forms of Cd, Cu, Zn and Pb in the sediments of the Xiangjiang River have been investigated. The presentation of this paper focuses on the various forms and characteristics of the heavy metals in the column sediments at Xiawan Port of Zhuzhou, which has been severely polluted by a metallurgical plant.The forms of the heavy metals discussed in this paper are: The concentration of the exchangeable forms of Cd, Cu, Zn and Pb, in the forms of carbonates and Fe/ Mn oxide in water, the combination of Cu with organic matter and form, and the proportion of the residue form at each section have been studied.展开更多
Unsafe abortions constitute a public health problem. It is one of the causes of maternal mortality in the world and particularly in developing countries. Despite the progress made, maternal mortality remains high in C...Unsafe abortions constitute a public health problem. It is one of the causes of maternal mortality in the world and particularly in developing countries. Despite the progress made, maternal mortality remains high in Cameroon. The scarcity and disparity of data on abortions lead to a lack of strong evidence to advocate to decision-makers on the extent of the problems associated with abortions in Cameroon. Our objective is to estimate the rates of mortalities and complications related to unsafe abortions, as well as the difficulties of accessing safe abortions in Cameroon. We will carry out a systematic and meta-analytical review in the biomedical databases MEDLINE (Pubmed), Google Scholar and African Journal Online (AJOL) concerning unsafe abortions and/or difficulties in accessing safe abortions in Cameroon, without date or language restriction. Gray literature will be also consulted. Two authors will simultaneously select the studies and data extraction will be done using a Google Form. Proportions will be estimated on a random-effect model. The I<sup>2</sup> and Q statistics will be used to assess the extent of heterogeneity across the studies. The outcome of both the quantitative and qualitative parts of the study will be commented. Death and morbidity due to abortions can be prevented. A concerted multidisciplinary and multicentric action would be essential.展开更多
目的整体评价清浊祛毒丸治疗慢性前列腺炎的临床疗效以及安全性,为临床应用提供科学依据。方法检索Web of science、PubMed、中国知网、万方和维普数据库,搜集自清浊祛毒丸上市(2002年)至2020年10月已发表的关于清浊祛毒丸治疗慢性前列...目的整体评价清浊祛毒丸治疗慢性前列腺炎的临床疗效以及安全性,为临床应用提供科学依据。方法检索Web of science、PubMed、中国知网、万方和维普数据库,搜集自清浊祛毒丸上市(2002年)至2020年10月已发表的关于清浊祛毒丸治疗慢性前列腺炎的临床随机对照试验。由2名研究人员根据纳入和排除标准独立完成文献的筛选、资料提取及质量评价工作。分析两组结果的总有效率、NIH-CPSI评分和不良反应发生率。结果最终纳入6篇随机对照试验,共679例患者。两组的总有效率:[RR=1.22,95%CI(1.05,1.42),P=0.008];NIH-CPSI评分:[MD=-3.29,95%CI(-6.11,-0.48),P=0.02];不良反应发生率:[RR=1.08,95%CI(0.65,1.78),P=0.76]。结论清浊祛毒丸参与干预的试验组比对照组总有效率高、NIP-CPSI评分降低更明显,且较为安全。展开更多
提出了一种基于卷积神经网络的物品矢量检测识别方法:ACDet(self-attention and concatenation based detector),旨在解决照度变化下密集无序药品包装轮廓的高效检测问题。该方法采用组合图像增强技术提升模型学习物品外观特征的能力,...提出了一种基于卷积神经网络的物品矢量检测识别方法:ACDet(self-attention and concatenation based detector),旨在解决照度变化下密集无序药品包装轮廓的高效检测问题。该方法采用组合图像增强技术提升模型学习物品外观特征的能力,对计算模块C2F-A(C2F with attention)采用多条梯度流输出来进行多维度的强化自我注意力增强,包括特征维度和空间维度。设计的WConcat(weighted concatenation)模块可以对不同层次的特征图进行加权拼接并捕捉更关键的特征图,从而使网络具备更好的认知能力。在医药案例数据集(cancer pathological and pharmaceutical dataset,CPPD)实验中实现了81.0%的mAP(mean average precision),79.5%的Smoot hmAP,平均领先其他YOLO(you only look once)架构的模型5.5%~16.6%,在公开数据集平均领先0.7%~6.9%。同时,零样本测试中复核成功率达到99.9%。研究结果显示,ACDet能克服复杂检测场景难题,实现网络鲁棒性提升及轻量化,为工业智能化生产提供了技术支持。展开更多
Recent studies have shown that synergistic precipitation of continuous precipitates(CPs)and discontinuous precipitates(DPs)is a promising method to simultaneously improve the strength and electrical conductivity of Cu...Recent studies have shown that synergistic precipitation of continuous precipitates(CPs)and discontinuous precipitates(DPs)is a promising method to simultaneously improve the strength and electrical conductivity of Cu-Ni-Si alloy.However,the complex relationship between precipitates and two-stage aging process presents a significant challenge for the optimization of process parameters.In this study,machine learning models were established based on orthogonal experiment to mine the relationship between two-stage aging parameters and properties of Cu-5.3Ni-1.3Si-0.12Nb alloy with preferred formation of DPs.Two-stage aging parameters of 400℃/75 min+400℃/30 min were then obtained by multi-objective optimization combined with an experimental iteration strategy,resulting in a tensile strength of 875 MPa and a conductivity of 41.43%IACS,respectively.Such an excellent comprehensive performance of the alloy is attributed to the combined precipitation of DPs and CPs(with a total volume fraction of 5.4%and a volume ratio of CPs to DPs of 6.7).This study could provide a new approach and insight for improving the comprehensive properties of the Cu-Ni-Si alloys.展开更多
The two-photon state with spatial entanglement is an essential resource for testing fundamental laws of quantum mechanics and various quantum applications.Its creation typically relies on spontaneous parametric downco...The two-photon state with spatial entanglement is an essential resource for testing fundamental laws of quantum mechanics and various quantum applications.Its creation typically relies on spontaneous parametric downconversion in bulky nonlinear crystals where the tunability of spatial entanglement is limited.Here,we predict that ultrathin nonlinear lithium niobate metasurfaces can generate and diversely tune spatially entangled photon pairs.The spatial properties of photons including the emission pattern,rate,and degree of spatial entanglement are analyzed theoretically with the coupled mode theory and Schmidt decomposition method.We show that by leveraging the strong angular dispersion of the metasurface,the degree of spatial entanglement quantified by the Schmidt number can be decreased or increased by changing the pump laser wavelength and a Gaussian beam size.This flexibility can facilitate diverse quantum applications of entangled photon states generated from nonlinear metasurfaces.展开更多
The properties of laser signals are affected by deformation of the optical fibre through which they are transmitted.While this deformation dependence is undesirable in telecommunication,it can be exploited for the con...The properties of laser signals are affected by deformation of the optical fibre through which they are transmitted.While this deformation dependence is undesirable in telecommunication,it can be exploited for the construction of novel seismic sensors that fill a niche in data acquisition where traditional seismometer arrays would be difficult to deploy.This includes densely populated urban centers,the oceans,volcanoes and the Earth’s polar regions.These notes complement a presentation on recent methodological developments and applications in fibre-optic seismology.The first part is focused on the use of distributed fibreoptic sensing in cryosphere research,and specifically the investigation of the internal structure and seismicity of glaciers and ice sheets.The second part is dedicated to recent advances in integrated fibre-optic sensing,with emphasis on novel measurement principles and sensitivity.展开更多
The healthcare sector involves many steps to ensure efficient care for patients,such as appointment scheduling,consultation plans,online follow-up,and more.However,existing healthcare mechanisms are unable to facilita...The healthcare sector involves many steps to ensure efficient care for patients,such as appointment scheduling,consultation plans,online follow-up,and more.However,existing healthcare mechanisms are unable to facilitate a large number of patients,as these systems are centralized and hence vulnerable to various issues,including single points of failure,performance bottlenecks,and substantial monetary costs.Furthermore,these mechanisms are unable to provide an efficient mechanism for saving data against unauthorized access.To address these issues,this study proposes a blockchain-based authentication mechanism that authenticates all healthcare stakeholders based on their credentials.Furthermore,also utilize the capabilities of the InterPlanetary File System(IPFS)to store the Electronic Health Record(EHR)in a distributed way.This IPFS platform addresses not only the issue of high data storage costs on blockchain but also the issue of a single point of failure in the traditional centralized data storage model.The simulation results demonstrate that our model outperforms the benchmark schemes and provides an efficient mechanism for managing healthcare sector operations.The results show that it takes approximately 3.5 s for the smart contract to authenticate the node and provide it with the decryption key,which is ultimately used to access the data.The simulation results show that our proposed model outperforms existing solutions in terms of execution time and scalability.The execution time of our model smart contract is around 9000 transactions in just 6.5 s,while benchmark schemes require approximately 7 s for the same number of transactions.展开更多
文摘In this paper, the contents and various forms of Cd, Cu, Zn and Pb in the sediments of the Xiangjiang River have been investigated. The presentation of this paper focuses on the various forms and characteristics of the heavy metals in the column sediments at Xiawan Port of Zhuzhou, which has been severely polluted by a metallurgical plant.The forms of the heavy metals discussed in this paper are: The concentration of the exchangeable forms of Cd, Cu, Zn and Pb, in the forms of carbonates and Fe/ Mn oxide in water, the combination of Cu with organic matter and form, and the proportion of the residue form at each section have been studied.
文摘Unsafe abortions constitute a public health problem. It is one of the causes of maternal mortality in the world and particularly in developing countries. Despite the progress made, maternal mortality remains high in Cameroon. The scarcity and disparity of data on abortions lead to a lack of strong evidence to advocate to decision-makers on the extent of the problems associated with abortions in Cameroon. Our objective is to estimate the rates of mortalities and complications related to unsafe abortions, as well as the difficulties of accessing safe abortions in Cameroon. We will carry out a systematic and meta-analytical review in the biomedical databases MEDLINE (Pubmed), Google Scholar and African Journal Online (AJOL) concerning unsafe abortions and/or difficulties in accessing safe abortions in Cameroon, without date or language restriction. Gray literature will be also consulted. Two authors will simultaneously select the studies and data extraction will be done using a Google Form. Proportions will be estimated on a random-effect model. The I<sup>2</sup> and Q statistics will be used to assess the extent of heterogeneity across the studies. The outcome of both the quantitative and qualitative parts of the study will be commented. Death and morbidity due to abortions can be prevented. A concerted multidisciplinary and multicentric action would be essential.
文摘目的整体评价清浊祛毒丸治疗慢性前列腺炎的临床疗效以及安全性,为临床应用提供科学依据。方法检索Web of science、PubMed、中国知网、万方和维普数据库,搜集自清浊祛毒丸上市(2002年)至2020年10月已发表的关于清浊祛毒丸治疗慢性前列腺炎的临床随机对照试验。由2名研究人员根据纳入和排除标准独立完成文献的筛选、资料提取及质量评价工作。分析两组结果的总有效率、NIH-CPSI评分和不良反应发生率。结果最终纳入6篇随机对照试验,共679例患者。两组的总有效率:[RR=1.22,95%CI(1.05,1.42),P=0.008];NIH-CPSI评分:[MD=-3.29,95%CI(-6.11,-0.48),P=0.02];不良反应发生率:[RR=1.08,95%CI(0.65,1.78),P=0.76]。结论清浊祛毒丸参与干预的试验组比对照组总有效率高、NIP-CPSI评分降低更明显,且较为安全。
文摘提出了一种基于卷积神经网络的物品矢量检测识别方法:ACDet(self-attention and concatenation based detector),旨在解决照度变化下密集无序药品包装轮廓的高效检测问题。该方法采用组合图像增强技术提升模型学习物品外观特征的能力,对计算模块C2F-A(C2F with attention)采用多条梯度流输出来进行多维度的强化自我注意力增强,包括特征维度和空间维度。设计的WConcat(weighted concatenation)模块可以对不同层次的特征图进行加权拼接并捕捉更关键的特征图,从而使网络具备更好的认知能力。在医药案例数据集(cancer pathological and pharmaceutical dataset,CPPD)实验中实现了81.0%的mAP(mean average precision),79.5%的Smoot hmAP,平均领先其他YOLO(you only look once)架构的模型5.5%~16.6%,在公开数据集平均领先0.7%~6.9%。同时,零样本测试中复核成功率达到99.9%。研究结果显示,ACDet能克服复杂检测场景难题,实现网络鲁棒性提升及轻量化,为工业智能化生产提供了技术支持。
基金financially supported by the National Key Research and Development Program of China(No.2023YFB3812601)the National Natural Science Foundation of China(Nos.51925401,92066205 and 92266301)the Young Elite Scientists Sponsorship Program by CAST(No.2022QNRC001).
文摘Recent studies have shown that synergistic precipitation of continuous precipitates(CPs)and discontinuous precipitates(DPs)is a promising method to simultaneously improve the strength and electrical conductivity of Cu-Ni-Si alloy.However,the complex relationship between precipitates and two-stage aging process presents a significant challenge for the optimization of process parameters.In this study,machine learning models were established based on orthogonal experiment to mine the relationship between two-stage aging parameters and properties of Cu-5.3Ni-1.3Si-0.12Nb alloy with preferred formation of DPs.Two-stage aging parameters of 400℃/75 min+400℃/30 min were then obtained by multi-objective optimization combined with an experimental iteration strategy,resulting in a tensile strength of 875 MPa and a conductivity of 41.43%IACS,respectively.Such an excellent comprehensive performance of the alloy is attributed to the combined precipitation of DPs and CPs(with a total volume fraction of 5.4%and a volume ratio of CPs to DPs of 6.7).This study could provide a new approach and insight for improving the comprehensive properties of the Cu-Ni-Si alloys.
基金supported by the Australian Research Council(DP190101559,CE200100010).
文摘The two-photon state with spatial entanglement is an essential resource for testing fundamental laws of quantum mechanics and various quantum applications.Its creation typically relies on spontaneous parametric downconversion in bulky nonlinear crystals where the tunability of spatial entanglement is limited.Here,we predict that ultrathin nonlinear lithium niobate metasurfaces can generate and diversely tune spatially entangled photon pairs.The spatial properties of photons including the emission pattern,rate,and degree of spatial entanglement are analyzed theoretically with the coupled mode theory and Schmidt decomposition method.We show that by leveraging the strong angular dispersion of the metasurface,the degree of spatial entanglement quantified by the Schmidt number can be decreased or increased by changing the pump laser wavelength and a Gaussian beam size.This flexibility can facilitate diverse quantum applications of entangled photon states generated from nonlinear metasurfaces.
基金partially funded by the Real-time Earthquake Risk Reduction for a Resilient Europe project (RISE) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement Number 821 115)provided by the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No. 955 515 (SPIN ITN)by the Swiss National Science Foundation (SNSF) Sinergia grant CRSII5_183579
文摘The properties of laser signals are affected by deformation of the optical fibre through which they are transmitted.While this deformation dependence is undesirable in telecommunication,it can be exploited for the construction of novel seismic sensors that fill a niche in data acquisition where traditional seismometer arrays would be difficult to deploy.This includes densely populated urban centers,the oceans,volcanoes and the Earth’s polar regions.These notes complement a presentation on recent methodological developments and applications in fibre-optic seismology.The first part is focused on the use of distributed fibreoptic sensing in cryosphere research,and specifically the investigation of the internal structure and seismicity of glaciers and ice sheets.The second part is dedicated to recent advances in integrated fibre-optic sensing,with emphasis on novel measurement principles and sensitivity.
基金supported by the Ongoing Research Funding program(ORF-2025-636),King Saud University,Riyadh,Saudi Arabia.
文摘The healthcare sector involves many steps to ensure efficient care for patients,such as appointment scheduling,consultation plans,online follow-up,and more.However,existing healthcare mechanisms are unable to facilitate a large number of patients,as these systems are centralized and hence vulnerable to various issues,including single points of failure,performance bottlenecks,and substantial monetary costs.Furthermore,these mechanisms are unable to provide an efficient mechanism for saving data against unauthorized access.To address these issues,this study proposes a blockchain-based authentication mechanism that authenticates all healthcare stakeholders based on their credentials.Furthermore,also utilize the capabilities of the InterPlanetary File System(IPFS)to store the Electronic Health Record(EHR)in a distributed way.This IPFS platform addresses not only the issue of high data storage costs on blockchain but also the issue of a single point of failure in the traditional centralized data storage model.The simulation results demonstrate that our model outperforms the benchmark schemes and provides an efficient mechanism for managing healthcare sector operations.The results show that it takes approximately 3.5 s for the smart contract to authenticate the node and provide it with the decryption key,which is ultimately used to access the data.The simulation results show that our proposed model outperforms existing solutions in terms of execution time and scalability.The execution time of our model smart contract is around 9000 transactions in just 6.5 s,while benchmark schemes require approximately 7 s for the same number of transactions.
