检索结果-南通市图书馆

Response of ocean acidification to atmospheric carbon dioxide removal

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第6期140卷 79-90页

作者： Jiu jiang Long Cao Xiaoyu Jin Zechen Yu Han Zhang Jianjie Fu Guibin jiang School of Environment Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Key Laboratory of Geoscience Big Data and Deep Resources of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhou 310058China Zhejiang Climate Center Hangzhou 310052China

Artificial CO_(2)removal from the atmosphere(also referred to as negative CO_(2)emissions)has been proposed as a potential means to counteract anthropogenic climate *** we use an Earth system model to examine the response of ocean acidification to idealized atmospheric CO_(2)removal *** our simulations,atmospheric CO_(2)is assumed to increase at a rate of 1%per year to four times its pre-industrial value and then decreases to the pre-industrial level at a rate of 0.5%,1%,2%per year,*** results show that the annual mean state of surface ocean carbonate chemistry fields including hydrogen ion concentration([H^(+)]),pH and aragonite saturation state respond quickly to removal of atmospheric CO_(2).However,the change of seasonal cycle in carbonate chemistry lags behind the decline in atmospheric CO_(2).When CO_(2)returns to the pre-industrial level,over some parts of the ocean,relative to the pre-industrial state,the seasonal amplitude of carbonate chemistry fields is substantially *** results also show that changes in deep ocean carbonate chemistry substantially lag behind atmospheric CO_(2)*** CO_(2)returns to its pre-industrial value,the whole-ocean acidity measured by[H^(+)]is 15%-18%larger than the pre-industrial level,depending on the rate of CO_(2)*** study demonstrates that even if atmospheric CO_(2)can be lowered in the future as a result of net negative CO_(2)emissions,the recovery of some aspects of ocean acidification would take decades to centuries,which would have important implications for the resilience of marine ecosystems.

关键词： Carbon dioxide removal Net negative CO_(2)emission Ocean acidification Climate change Earth system modeling

Rhyscotus subrisus Li&jiang,***.,representing a new record family Rhyscotidae from China(Isopoda:Oniscidea)

在线全文

学校读者我要写书评

暂无评论

Zoological Systematics 2024年第2期49卷 181-183页

作者： Chonghui Yao Chao jiang Weichun Li College of Agronomy Jiangxi Agricultural UniversityNanchang 330045China State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs National Resource Center for Chinese MateriaMedicaChina Academy of Chinese Medical SciencesBeijing 100700China

The family Rhyscotidae Budde-Lund,1904 contains two genera:Rhyscotoides Schmalfuss&Ferrara,1978 and Rhyscotus Budde-Lund,*** date,twenty-one species within the family are known,occurring in the subtropic and tropic regions(Schmalfuss,2003;Schmidt,2003;Boyko et al.,2022).The members of the family can be recognized by the cephalon with a strongly inflated frons,the antennae with two-jointed flagellum,the maxillae are almost semicircular,the maxillipeds have short palpus and endite,and pleopod exopodites without pseudotracheae(Schmalfuss&Ferrara,1978).Before this study,the members of Rhyscotidae were unknown in *** present research describes a new species of the genus Rhyscotus from Hainan Island,representing a new record of the family Rhyscotidae from China.

关键词： record family

Growth of Ag/g-C_(3)N_(4) nanocomposites on nickel foam to enhance photocatalytic degradation of formaldehyde under visible light

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第3期137卷 432-442页

作者： Ze Wang Zhi Huang jiang Yu Xiao Shao Weidong Peng Jie Yu Yinying jiang Department of Environmental Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China Institute of New Energy and Low Carbon Technology Sichuan UniversityChengdu 610065China School of Agriculture and Environment University of Western AustraliaPerth 6907Western AustraliaAustralia Yibin Institute of Industrial Technology Sichuan UniversityYibin 644000China

Formaldehyde is a pollutant that significantly affects the indoor air ***,conventional remediation approaches can be challenging to deal with low-concentration formaldehyde in an indoor *** this study,Photocatalysts of Ag/graphitic carbon nitride(g-C_(3)N_(4))/Ni with 3D reticulated coral structure were prepared by thermal polymerization and liquid phase photo-deposition,using nickel foam(NF)as the *** demonstrated that when the Ag concentration was 3%,and the relative humidity was 60%,the Ni/Ag/g-C_(3)N_(4)showed the maximum degradation rate of formaldehyde at 90.19%under visible light irradiation,and the formaldehyde concentration after degradation was lower than the Hygienic standard stated by the Chinese *** porous structure of Ni/Ag/g-C_(3)N_(4)and the formation of Schottky junctions promoted the Adsorption efficiency and degradation of formaldehyde,while the nickel foam carrier effectively promoted the desorption of degradation ***,the degradation rate was only reduced by3.4%after 16 recycles,the three-dimensional porous structure extended the lifetime of the *** study provides a new strategy for the degradation of indoor formaldehyde at low concentrations.

关键词： Graphitic carbon nitride(g-C_(3)N_(4)) Nickel foam(NF) Ag Formaldehyde Photocatalysis

CPH-I、CA12-5和HE4对伴乳头状结节的卵巢肿瘤恶性风险的预测价值评估

在线全文

学校读者我要写书评

暂无评论

中国癌症杂志 2020年第8期30卷 599-604页

作者：王志恒毛佩敏蒋红元范灵玲复旦大学附属妇产科医院检验科上海200011 复旦大学附属妇产科医院妇科上海200011

背景与目的:超声提示囊腔内有乳头状结节的卵巢肿瘤因其被怀疑有恶性可能而存在过度治疗风险,轻率的手术无疑会对年轻有生育需求的患者造成卵巢功能损害,因此对这类特殊的卵巢肿瘤进行恶性风险预测,就有可能为恶性风险低的年轻患者争取... 详细信息

背景与目的:超声提示囊腔内有乳头状结节的卵巢肿瘤因其被怀疑有恶性可能而存在过度治疗风险,轻率的手术无疑会对年轻有生育需求的患者造成卵巢功能损害,因此对这类特殊的卵巢肿瘤进行恶性风险预测,就有可能为恶性风险低的年轻患者争取延缓手术的机会。评估哥本哈根指数(Copenhagen index,CPH-I)、糖类抗原12-5(carbohydrate antigen 12-5,CA12-5)和人附睾蛋白4(human epididymis protein 4,HE4)对超声提示有乳头状结节的卵巢肿瘤恶性风险预测价值。方法:收集2015年7月-2019年6月复旦大学附属妇产科医院术前超声提示存在乳头状结节的192例卵巢肿瘤患者的临床资料,包括年龄、绝经与否、乳头状结节数量、肿瘤最大直径、病理学分期分型、术前CA12-5和HE4值,并求出CPH-I值。根据术后病理学检查结果分为良性组、恶性组和交界组,绘制受试者工作特性(receiver operating characteristic,ROC)曲线,评估CPH-I、CA12-5和HE4对卵巢良恶性肿瘤的鉴别能力。结果:CPH-I、CA12-5和HE4对良性组和恶性组均有较好的鉴别能力,其中CPH-I的鉴别能力优于HE4(P<0.01),其余两两比较差异均无统计学意义。CA12-5三者在良性组与恶性组+交界组中均具有良好的鉴别能力,其中CPH-I和CA12-5的鉴别能力均优于HE4(P<0.001,P<0.05)。将≤5 cm的卵巢肿瘤进行独立分组进行分析,其结果与不分组时相类似。无论未分组前还是对≤5 cm独立分组后,CPH-I在鉴别良性组与恶性组时,均有较高的灵敏度、特异度、阳性预测值及阴性预测值。结论:CPH-I、CA12-5和HE4对超声提示有乳头状结节的卵巢肿瘤的恶性风险具有一定的预测价值,总体而言,CPH-I优于CA12-5及HE4,CA12-5优于HE4。因此对于年轻有生育需求的患者,即使B超提示卵巢肿瘤存在乳头状结节,尤其当肿瘤体积不大(≤5 cm)时,可以通过定期监测肿瘤生物标志物和B超检查进行随访和评估。

关键词：哥本哈根指数糖类抗原12-5 人附睾蛋白4 交界性卵巢肿瘤上皮性卵巢肿瘤

Recent Advances on Deep Learning for Sign Language Recognition

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第6期139卷 2399-2450页

作者： Yanqiong Zhang Xianwei jiang School of Mathematics and Information Science Nanjing Normal University of Special EducationNanjing210038China

Sign language,a visual-gestural language used by the deaf and hard-of-hearing community,plays a crucial role in facilitating communication and promoting *** language recognition(SLR),the process of automatically recognizing and interpreting sign language gestures,has gained significant attention in recent years due to its potential to bridge the communication gap between the hearing impaired and the hearing *** emergence and continuous development of deep learning techniques have provided inspiration and momentum for advancing *** paper presents a comprehensive and up-to-date analysis of the advancements,challenges,and opportunities in deep learning-based sign language recognition,focusing on the past five years of *** explore various aspects of SLR,including sign data acquisition technologies,sign language datasets,evaluation methods,and different types of neural *** Neural Networks(CNN)and Recurrent Neural Networks(RNN)have shown promising results in fingerspelling and isolated sign ***,the continuous nature of sign language poses challenges,leading to the exploration of advanced neural network models such as the Transformer model for continuous sign language recognition(CSLR).Despite significant advancements,several challenges remain in the field of *** challenges include expanding sign language datasets,achieving user independence in recognition systems,exploring different input modalities,effectively fusing features,modeling co-articulation,and improving semantic and syntactic ***,developing lightweight network architectures for mobile applications is crucial for practical *** addressing these challenges,we can further advance the field of deep learning for sign language recognition and improve communication for the hearing-impaired community.

关键词： Sign language recognition deep learning artificial intelligence computer vision gesture recognition

A Real-Time Small Target Vehicle Detection Algorithm with an Improved YOLOv5m Network Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第1期78卷 303-327页

作者： Yaoyao Du Xiangkui jiang School of Automation Xi’an University of Posts and TelecommunicationsXi’an710121China

To address the challenges of high complexity,poor real-time performance,and low detection rates for small target vehicles in existing vehicle object detection algorithms,this paper proposes a real-time lightweight architecture based on You Only Look Once(YOLO)***,a lightweight upsampling operator called Content-Aware Reassembly of Features(CARAFE)is introduced in the feature fusion layer of the network to maximize the extraction of deep-level features for small target vehicles,reducing the missed detection rate and false detection ***,a new prediction layer for tiny targets is added,and the feature fusion network is redesigned to enhance the detection capability for small ***,this paper applies L1 regularization to train the improved network,followed by pruning and fine-tuning operations to remove redundant channels,reducing computational and parameter complexity and enhancing the detection efficiency of the *** is conducted on the VisDrone2019-DET *** experimental results show that the proposed algorithmreduces parameters and computation by 63.8% and 65.8%,*** average detection accuracy improves by 5.15%,and the detection speed reaches 47 images per second,satisfying real-time *** with existing approaches,including YOLOv5m and classical vehicle detection algorithms,our method achieves higher accuracy and faster speed for real-time detection of small target vehicles in edge computing.

关键词： Vehicle detection YOLOv5m small target channel pruning CARAFE

Review of Collocation Methods and Applications in Solving Science and Engineering Problems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第7期140卷 41-76页

作者： Weiwu jiang Xiaowei Gao School of Aeronautics and Astronautics Dalian University of TechnologyDalian116024China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian116024China

The collocation method is a widely used numerical method for science and engineering problems governed by partial differential *** paper provides a comprehensive review of collocation methods and their applications,focused on elasticity,heat conduction,electromagnetic field analysis,and fluid *** merits of the collocation method can be attributed to the need for element mesh,simple implementation,high computational efficiency,and ease in handling irregular domain problems since the collocation method is a type of node-based numerical *** with the fundamental principles of the collocation method,the discretization process in the continuous domain is elucidated,and how the collocation method approximation solutions for solving differential equations are *** into the historical development of the collocation methods,their earliest applications and key milestones are traced,thereby demonstrating their evolution within the realm of numerical *** mathematical foundations of collocation methods,encompassing the selection of interpolation functions,definition of weighting functions,and derivation of integration rules,are examined in detail,emphasizing their significance in comprehending the method’s effectiveness and *** last,the practical application of the collocation methods in engineering contexts is emphasized,including heat conduction simulations,electromagnetic coupled field analysis,and fluid dynamics *** specific case studies can underscore collocation method’s broad applicability and effectiveness in addressing complex engineering *** conclusion,this paper puts forward the future development trend of the collocation method through rigorous analysis and discussion,thereby facilitating further advancements in research and practical applications within these fields.

关键词： Collocation method meshless method discrete schemes for functions numerical calculation

基于金属橡胶和介电泳效应的微粒循环过滤实验研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

实验流体力学 2020年第2期34卷 39-45页

作者：宋春磊任玉坤何文俊姜天一姜洪源哈尔滨工业大学机电工程学院哈尔滨150001 哈尔滨工业大学机器人技术与系统国家重点实验室哈尔滨150001

为改善金属橡胶板的过滤能力,将多孔金属橡胶板与介电泳力相结合,并利用液态金属在受限空间内的高效泵送功能,研究了金属橡胶板对5μm聚苯乙烯微球的过滤性能。实验中,将一对金属橡胶板平行嵌入至闭环微流体循环通道内,以实现介电泳力... 详细信息

为改善金属橡胶板的过滤能力,将多孔金属橡胶板与介电泳力相结合,并利用液态金属在受限空间内的高效泵送功能,研究了金属橡胶板对5μm聚苯乙烯微球的过滤性能。实验中,将一对金属橡胶板平行嵌入至闭环微流体循环通道内,以实现介电泳力的交流电场梯度。结果表明:由于金属橡胶板内部孔径远大于聚苯乙烯微球直径,在未施加交流电信号的情况下,较难实现过滤功能;而对两个金属橡胶板适当通电,则电解液中的聚苯乙烯微球将被短距离的介电泳力收集于金属橡胶板周围,明显提高过滤效率。

关键词：金属橡胶介电泳过滤效率微粒微流体

A New Solution to Intrusion Detection Systems Based on Improved Federated-Learning Chain

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第6期79卷 4491-4512页

作者： Chunhui Li Hua jiang School of Computer and Electronic Information Guangxi UniversityNanning530000China Cyber Security and Information Center Guangxi UniversityNanning530000China

In the context of enterprise systems,intrusion detection(ID)emerges as a critical element driving the digital transformation of *** systems spanning various sectors of enterprises geographically dispersed,the necessity for seamless information exchange has surged *** existing cross-domain solutions are challenged by such issues as insufficient security,high communication overhead,and a lack of effective update mechanisms,rendering them less feasible for prolonged application on resource-limited *** study proposes a new cross-domain collaboration scheme based on federated chains to streamline the server-side *** this framework,individual nodes solely engage in training local data and subsequently amalgamate the final model employing a federated learning algorithm to uphold enterprise systems with efficiency and *** curtail the resource utilization of blockchains and deter malicious nodes,a node administration module predicated on the workload paradigm is introduced,enabling the release of surplus resources in response to variations in a node’s contribution *** encountering an intrusion,the system triggers an alert and logs the characteristics of the breach,facilitating a comprehensive global update across all nodes for collective *** results across multiple scenarios have verified the security and effectiveness of the proposed solution,with no loss of its recognition accuracy.

关键词： Cross-domain collaboration blockchain federated learning contribution value node management release slack resources