期刊文献+
共找到3,116篇文章
< 1 2 156 >
每页显示 20 50 100
Enhanced Thermal Performance of a Shell and Coil Tube Heat Exchanger Using Fins and Slots
1
作者 Najiba Hasan Hamad RanjSirwan Abdullah Ahmed Mohammed Adham 《Energy Engineering》 2026年第1期314-331,共18页
Coiled tube heat exchangers are widely preferred in shell structures due to their superior heat transfer performance,driven by favorable flow characteristics.This study investigates the effect of modifying coil and sh... Coiled tube heat exchangers are widely preferred in shell structures due to their superior heat transfer performance,driven by favorable flow characteristics.This study investigates the effect of modifying coil and shell configurations on heat transfer efficiency.Two key enhancements were examined:adding fins to the outer coil surface and integrating longitudinal slots within a hollowed shell.These modifications promote turbulence and extend heat transfer duration,thereby improving performance.However,they also introduce challenges,including increased pressure loss andmanufacturing complexity.Numerical simulationswere conducted usingANSYS Fluent 2024R1 under identical boundary conditions.With a fixed cold-side flow rate of 3 L/min,the input temperatures for the hot and cold fluids were 333.15 and 291.65 K,respectively.The hot-side flow rate varied between 2 and 6 L/min.Simulation outcomes were reported for the objectives of the study that included the improvement in heat exchangers’heat transfer enhancement.As it was indicated in the study outcomes,the average heat transfer rate increased by 15.56%,the overall heat transfer coefficient enhanced by about 29.51%,and the convective heat transfer coefficient improved by about 75.96%compared to the conventional shell-and-coil tube heat exchanger model.However,the modified technique resulted in a significant pressure drop. 展开更多
关键词 Heat transfer modified heat exchanger COIL convective heat transfer coefficient pressure drop
在线阅读 下载PDF
Cooperative Metaheuristics with Dynamic Dimension Reduction for High-Dimensional Optimization Problems
2
作者 Junxiang Li Zhipeng Dong +2 位作者 Ben Han Jianqiao Chen Xinxin Zhang 《Computers, Materials & Continua》 2026年第1期1484-1502,共19页
Owing to their global search capabilities and gradient-free operation,metaheuristic algorithms are widely applied to a wide range of optimization problems.However,their computational demands become prohibitive when ta... Owing to their global search capabilities and gradient-free operation,metaheuristic algorithms are widely applied to a wide range of optimization problems.However,their computational demands become prohibitive when tackling high-dimensional optimization challenges.To effectively address these challenges,this study introduces cooperative metaheuristics integrating dynamic dimension reduction(DR).Building upon particle swarm optimization(PSO)and differential evolution(DE),the proposed cooperative methods C-PSO and C-DE are developed.In the proposed methods,the modified principal components analysis(PCA)is utilized to reduce the dimension of design variables,thereby decreasing computational costs.The dynamic DR strategy implements periodic execution of modified PCA after a fixed number of iterations,resulting in the important dimensions being dynamically identified.Compared with the static one,the dynamic DR strategy can achieve precise identification of important dimensions,thereby enabling accelerated convergence toward optimal solutions.Furthermore,the influence of cumulative contribution rate thresholds on optimization problems with different dimensions is investigated.Metaheuristic algorithms(PSO,DE)and cooperative metaheuristics(C-PSO,C-DE)are examined by 15 benchmark functions and two engineering design problems(speed reducer and composite pressure vessel).Comparative results demonstrate that the cooperative methods achieve significantly superior performance compared to standard methods in both solution accuracy and computational efficiency.Compared to standard metaheuristic algorithms,cooperative metaheuristics achieve a reduction in computational cost of at least 40%.The cooperative metaheuristics can be effectively used to tackle both high-dimensional unconstrained and constrained optimization problems. 展开更多
关键词 Dimension reduction modified principal components analysis high-dimensional optimization problems cooperative metaheuristics metaheuristic algorithms
在线阅读 下载PDF
Latest progress and challenges in drug development for degenerative motor neuron diseases
3
作者 Xiangjin Wen Tianxiang Lan +3 位作者 Weiming Su Bei Cao Yi Wang Yongping Chen 《Neural Regeneration Research》 2026年第5期1849-1863,共15页
Motor neuron diseases are sporadic or inherited fatal neurodegenerative conditions.They selectively affect the upper and/or lower motor neurons in the brain and spinal cord and feature a slow onset and a subacute cour... Motor neuron diseases are sporadic or inherited fatal neurodegenerative conditions.They selectively affect the upper and/or lower motor neurons in the brain and spinal cord and feature a slow onset and a subacute course contingent upon the site of damage.The main types include amyotrophic lateral sclerosis,progressive muscular atrophy,primary lateral sclerosis,and progressive bulbar palsy,the pathological processes of which are largely identical,with the main disparity lying in the location of the lesions.Amyotrophic lateral sclerosis is the representative condition in this group of diseases,while other types are its variants.Hence,this article mainly focuses on the advancements and challenges in drug research for amyotrophic lateral sclerosis but also briefly addresses several other important degenerative motor neuron diseases.Although the precise pathogenesis remains elusive,recent advancements have shed light on various theories,including gene mutation,excitatory amino acid toxicity,autoimmunology,and neurotrophic factors.The US Food and Drug Administration has approved four drugs for use in delaying the progression of amyotrophic lateral sclerosis:riluzole,edaravone,AMX0035,and tofersen,with the latter being the most recent to receive approval.However,following several phaseⅢtrials that failed to yield favorable outcomes,AMX0035 has been voluntarily withdrawn from both the US and Canadian markets.This article presents a comprehensive summary of drug trials primarily completed between January 1,2023,and June 30,2024,based on data sourced from clinicaltrials.gov.Among these trials,five are currently in phaseⅠ,seventeen are in phaseⅡ,and eleven are undergoing phaseⅢevaluation.Notably,24 clinical trials are now investigating potential disease-modifying therapy drugs,accounting for the majority of the drugs included in this review.Some promising drugs being investigated in preclinical studies,such as ATH-1105,are included in our analysis,and another review in frontiers in gene therapy and immunotherapy has demonstrated their therapeutic potential for motor neuron diseases.This article was written to be an overview of research trends and treatment prospects related to motor neuron disease drugs,with the aim of highlighting the latest potentialities for clinical therapy. 展开更多
关键词 amyotrophic lateral sclerosis clinical trial degenerative motor neuron diseases disease modifying therapy drug development motor neuron disease
暂未订购
Floquet Weyl Semimetals with Linked Fermi Arcs
4
作者 Dongling Liu Zheng-Yang Zhuang Zhongbo Yan 《Chinese Physics Letters》 2026年第1期218-224,共7页
Floquet engineering provides a powerful and flexible method for modifying the band structures of quantum materials.While circularly polarized light has been shown to convert curved nodal lines in three-dimensional sem... Floquet engineering provides a powerful and flexible method for modifying the band structures of quantum materials.While circularly polarized light has been shown to convert curved nodal lines in three-dimensional semimetals into Weyl points,such a transformation is forbidden for an isolated straight nodal line.In this work,we uncover a dramatic shift in this paradigm when multiple straight nodal lines intersect.We observe that circularly polarized light not only gaps them into Weyl points but also induces unprecedented surface-state Fermi arcs that extend across the entire surface Brillouin zone and form a linked topological structure.These findings advance our fundamental understanding of light-driven transitions in topological semimetals and unveil a unique Weyl semimetal phase defined by linked Fermi arcs.We discuss potential exotic phenomena arising from this phase,applications of our predictions to spin-split antiferromagnets,and the extension of this Weyl semimetal phase to classical systems. 展开更多
关键词 curved nodal lines weyl points weyl pointssuch floquet engineering quantum materialswhile modifying band structures circularly polarized light Floquet Weyl Semimetals
原文传递
基于Modified Page模型的玉米含水率预测及动力学分析
5
作者 齐迹 李健 +4 位作者 窦雪峰 孙旸 胡雅婷 李伟 张芳靖 《吉林农业大学学报》 北大核心 2025年第2期373-378,共6页
为了研究玉米的干燥特性以提高干燥效率,分析了微波功率、装载量、籽粒的初始含水率及初始温度等指标,得到了玉米籽粒干燥特性的变化规律。结果表明:微波干燥功率和温度对玉米籽粒的干燥特性有着很大的影响。使用SPSS运用回归分析和数... 为了研究玉米的干燥特性以提高干燥效率,分析了微波功率、装载量、籽粒的初始含水率及初始温度等指标,得到了玉米籽粒干燥特性的变化规律。结果表明:微波干燥功率和温度对玉米籽粒的干燥特性有着很大的影响。使用SPSS运用回归分析和数值分析方法对玉米微波干燥试验数据与Modified Page模型进行拟合,得到其评价指标R^(2)>0.991 0,χ^(2)<0.053 4,RMES<0.087,并经过验证试验,实测值与模型的预测值具有良好的相关系数(R^(2)>0.99),这表明该模型有利于提高干燥效率,提升玉米含水率的预测精度,以期确保玉米品质和安全。 展开更多
关键词 玉米 Modified Page模型 微波干燥 含水率 回归分析
原文传递
Establishment of a field visualization detection method for multiplex recombinase polymerase amplification combined with CRISPR/Cas12a in genetically modified crops 被引量:2
6
作者 YAN Jingying NI Liang +2 位作者 SHEN Xingyu LÜ Bingtao LI Yu 《浙江大学学报(农业与生命科学版)》 北大核心 2025年第3期391-401,共11页
With the approval of more and more genetically modified(GM)crops in our country,GM safety management has become more important.Transgenic detection is a major approach for transgenic safety management.Nevertheless,a c... With the approval of more and more genetically modified(GM)crops in our country,GM safety management has become more important.Transgenic detection is a major approach for transgenic safety management.Nevertheless,a convenient and visual technique with low equipment requirements and high sensitivity for the field detection of GM plants is still lacking.On the basis of the existing recombinase polymerase amplification(RPA)technique,we developed a multiplex RPA(multi-RPA)method that can simultaneously detect three transgenic elements,including the cauliflower mosaic virus 35S gene(CaMV35S)promoter,neomycin phosphotransferaseⅡgene(NptⅡ)and hygromycin B phosphotransferase gene(Hyg),thus improving the detection rate.Moreover,we coupled this multi-RPA technique with the CRISPR/Cas12a reporter system,which enabled the detection results to be clearly observed by naked eyes under ultraviolet(UV)light(254 nm;which could be achieved by a portable UV flashlight),therefore establishing a multi-RPA visual detection technique.Compared with the traditional test strip detection method,this multi-RPA-CRISPR/Cas12a technique has the higher specificity,higher sensitivity,wider application range and lower cost.Compared with other polymerase chain reaction(PCR)techniques,it also has the advantages of low equipment requirements and visualization,making it a potentially feasible method for the field detection of GM plants. 展开更多
关键词 genetically modified crop recombinase polymerase amplification CRISPR/Cas12a field detection
在线阅读 下载PDF
观察性研究中的因果图和混杂因素的识别和选择准则
7
作者 刘慧珍 周小芹 +1 位作者 王婷 康德英 《药物流行病学杂志》 2025年第10期1206-1212,共7页
在观察性研究中,准确可靠地估计暴露对结局的因果效应是其核心目标,而确定并充分矫正混杂因素是实现这一目标的关键前提和核心挑战。混杂因素控制不当——无论是遗漏关键混杂(导致残余混杂),还是过度调整无关变量(引入碰撞偏倚等)——... 在观察性研究中,准确可靠地估计暴露对结局的因果效应是其核心目标,而确定并充分矫正混杂因素是实现这一目标的关键前提和核心挑战。混杂因素控制不当——无论是遗漏关键混杂(导致残余混杂),还是过度调整无关变量(引入碰撞偏倚等)——都会直接扭曲效应估计结果,进而可能产生误导性的科学结论和临床决策。因此,开发并应用系统、透明且可重复的混杂因素识别与选择策略,对提升观察性研究因果推断的效度与可靠性具有根本性意义。本文通过系统综述有向无环图(DAGs)这一强大的可视化因果建模工具,并深入评析3种基于DAGs的主流混杂因素选择准则(Pre-exposure准则、Common cause准则、Modified disjunctive cause准则),为研究者提供一个结构化、理论依据充分的混杂因素识别与选择框架,以期显著优化观察性研究中因果效应的估计过程。 展开更多
关键词 混杂因素 混杂 有向无环图 Pre-exposure准则 Common cause准则 Modified disjunctive cause准则
原文传递
New insights into the mechanisms of modified Pulsatilla decoction in alleviating chemotherapy-induced intestinal mucositis 被引量:2
8
作者 Ajitha G Gopika Naresh Sachdeva 《World Journal of Gastroenterology》 2025年第12期192-195,共4页
Chemotherapy-induced intestinal mucositis(IM)is a prevalent complication affecting up to 80%of cancer patients undergoing treatment.Current therapies focus on symptomatic relief rather than addressing the underlying m... Chemotherapy-induced intestinal mucositis(IM)is a prevalent complication affecting up to 80%of cancer patients undergoing treatment.Current therapies focus on symptomatic relief rather than addressing the underlying mechanism.Recent advances in integrative medicine highlight the potential of traditional Chinese medicine formulations as alternatives or adjuncts to existing therapies.In this context,this editorial discusses the recent results of a study published by Qiu et al,which investigates the multifaceted potential of modified Pulsatilla decoction(PD),a formulation of PD with licorice(Glycyrrhiza uralensis)and Ejiao(Colla corii asini),on 5-fluorouracil-induced IM in mice to alleviate clinical symptoms including diarrhea,weight loss,and intestinal damage.A series of histological,biochemical,bioinformatic,and microbiological assays evaluated body weight,diarrhea scores,inflammatory cytokine profiles,oxidative stress modulation,and microbiota composition.The findings indicated a reduction in diarrhea and oxidative stress,as well as an improvement in body weight and intestinal histopathology.Furthermore,the modified PD suppressed the TLR4/MyD88/nuclear factor kappa-B inflammatory pathway and down-regulated key proinflammatory cytokines.Moreover,the study underscores the role of gut microbiota in IM pathogenesis.Modified PD treatment reshaped microbial diversity by promoting beneficial genera such as Bacteroides acidifaciens while suppressing pathogenic species like Salmonella.These findings suggest that the therapeutic effects of the modified PD extend beyond inflammation modulation to encompass microbiome reprogramming and mucosal barrier repair.Although the study provides significant insights,several limitations still prevail.The broader implications of modified PD in gastrointestinal disorders and integrative oncology need further exploration. 展开更多
关键词 Modified Pulsatilla decoction Intestinal mucositis Oxidative stress Gut microbiota TLR4/MyD88/nuclear factor kappa-B pathway Inflammatory response
暂未订购
State of the art review on inorganic powders modified asphalt materials: Reducing the temperature of asphalt pavement 被引量:1
9
作者 Chaohui Wang Tonghao Zhang +3 位作者 Anquan Li Dawei Zhao Luqing Liu Qian Chen 《Journal of Road Engineering》 2025年第2期279-296,共18页
To reduce the temperature diseases of asphalt pavement,improve the service quality of road and extend service life,the research of inorganic powders that reduce the temperature of asphalt pavements was systematically ... To reduce the temperature diseases of asphalt pavement,improve the service quality of road and extend service life,the research of inorganic powders that reduce the temperature of asphalt pavements was systematically sorted out.The common types,physicochemical properties and application methods of inorganic powders were defined.The road performances of modified asphalt and its mixture were evaluated.The modification mechanism of inorganic powders in asphalt was analyzed.On this basis,the cooling effect and cooling mechanism of inorganic powders was revealed.The results indicate that inorganic powders are classified into hollow,porous,and energy conversion types.The high-temperature performance of inorganic powders modified asphalt and its mixture is significantly improved,while there is no significant change in low-temperature performance and water stability.The average increase in rutting resistance factor(G*/sin(δ))and dynamic stability is 40%–72%and 30%–50%,respectively.The modification mechanism of inorganic powders in asphalt is physical blending.The thermal conductivity of hollow and porous inorganic powders modified asphalt mixture decreases by 30.05%and 43.14%,respectively.The temperature of hollow,porous and energy conversion inorganic powders modified asphalt mixture at 5 cm decreases by 2.3 ℃–3.5 ℃,0.8 ℃–3.7 ℃and 4.1 ℃–4.7℃,respectively.Hollow and porous inorganic powders block heat conduction,while energy conversion inorganic powders achieve cooling through their functional properties. 展开更多
关键词 Road materials COOLING Modified asphalt Inorganic powders PERFORMANCES
在线阅读 下载PDF
Application of modified Roux-en-Y digestive tract reconstruction in total gastrectomy for patients with gastric cancer 被引量:1
10
作者 Jing Yu Min Li +6 位作者 Xiang-Zhi Qin Lei Gong Long Qin Zhen-Bing Lv Wei Guo Bin Huang Yun-Hong Tian 《World Journal of Gastrointestinal Surgery》 2025年第6期206-216,共11页
BACKGROUND At present,the concept of surgical treatment of gastric cancer(GC)has changed from“radical treatment”to“care for patients”to a certain extent.The reconstruction method is the most likely to affect the p... BACKGROUND At present,the concept of surgical treatment of gastric cancer(GC)has changed from“radical treatment”to“care for patients”to a certain extent.The reconstruction method is the most likely to affect the postoperative life of the patient.Currently,the traditional Roux-en-Y esophagojejunostomy anastomosis is a commonly used method for gastrointestinal reconstruction after total gastrectomy for GC.However,more recent studies have shown that the traditional Roux-en-Y anastomosis is complicated in operation procedure,with more reconstruction steps and longer reconstruction time,and the incidence of postoperative complications such as adhesive intestinal obstruction,internal abdominal hernia and volvulus is high.Moreover,the incidence of Roux stasis syndrome is 10%-30%after traditional Roux-en-Y reconstruction.Thus,we modified the traditional Roux-en-Y alimentary tract reconstruction,and designed a new digestive tract reconstruction method for laparoscopy-assisted Roux-en-Y anastomosis for total gastrectomy of GC.AIM To evaluate the clinical advantages,feasibility,and safety of a modified Roux-en-Y digestive tract reconstruction in laparoscopy-assisted total gastrectomy for the treatment of GC compared with the traditional Roux-en-Y method.METHODS Ninety-seven patients who underwent laparoscopy-assisted D2 radical gastrectomy(total gastrectomy)for GC were divided into two groups:fifty-four in the conventional Roux-en-Y reconstruction group(Orr group)and forty-three in the modified Roux-en-Y reconstruction group(the modified group).Perioperative and short-term outcomes were analyzed,including complications,postoperative weight loss,hemoglobin levels,and nutritional status.RESULTS The Orr group and the modified group showed no statistically significant differences in baseline characteristics.Compared with the Orr group,the modified group had shorter digestive tract reconstruction and operation times,less intraoperative bleeding,and shorter postoperative hospital stays compared to the Orr group.Although both groups had similar amounts of intraoperative blood loss,postoperative recovery times,and hospital expenses,the Orr group experienced longer operation times and digestive tract reconstruction times.Furthermore,the modified Roux-en-Y group demonstrated significantly fewer short-term and long-term complications,with a reduced incidence of reflux esophagitis and improved nutritional status.CONCLUSION The modified Roux-en-Y digestive tract reconstruction method after laparoscopy-assisted total gastrectomy for GC offers safety,simplicity,and a reduction in bile reflux.This method shortens operation times and minimizes postoperative complications,aligns with modern rapid rehabilitation surgery trends and potentially improves patient prognosis and overall survival.This method warrants further clinical application and promotion. 展开更多
关键词 Gastric cancer Modified Roux-en-Y Gastrointestinal reconstruction Total gastrectomy ROUX-EN-Y
暂未订购
On Modified Rota-Baxter Hom-Lie Algebras 被引量:1
11
作者 Wen TENG 《Journal of Mathematical Research with Applications》 2025年第2期163-178,共16页
Semenov-Tian-Shansky has given the solution of the modified classical Yang-Baxter equation, which was called the modified r-matrix. Relevant studies have been extensive in recent times. In this paper, we introduce the... Semenov-Tian-Shansky has given the solution of the modified classical Yang-Baxter equation, which was called the modified r-matrix. Relevant studies have been extensive in recent times. In this paper, we introduce the concept and representations of modified RotaBaxter Hom-Lie algebras. We develop a cohomology of modified Rota-Baxter Hom-Lie algebras with coefficients in a suitable representation. As applications, we study formal deformations and abelian extensions of modified Rota-Baxter Hom-Lie algebras in terms of second cohomology groups. 展开更多
关键词 Hom-Lie algebra modified Rota-Baxter operator cohomology deformation abelian extension
原文传递
Functionalization of two-dimensional vermiculite composite materials for improved adsorption and catalytic conversion reaction of soluble polysulfides in lithium-sulfur batteries 被引量:1
12
作者 Tiancheng Wang Zehao Shi +5 位作者 Furan Wang Weiya Li Guohong Kang Wei Liu Seung-Taek Myung Yongcheng Jin 《Journal of Energy Chemistry》 2025年第3期586-596,共11页
In lithium-sulfur batteries(LSBs),the limited utilization of sulfur and the sluggish kinetics of redox reaction significantly hinder their electrochemical performance,especially under high rates and high sulfur loadin... In lithium-sulfur batteries(LSBs),the limited utilization of sulfur and the sluggish kinetics of redox reaction significantly hinder their electrochemical performance,especially under high rates and high sulfur loadings.Here,we propose a novel separator structure with an interlayer composed of a vermiculite nanosheet combined with Ketjen Black(VMT@KB)for LSBs,facilitating efficient adsorption and rapid catalytic conversion toward lithium polysulfides(LiPSs).The VMT@KB nanosheets with an electrical double-layer structure and electronic conductivity are obtained through a high-temperature peeling process and Li^(+)exchange treatment in LiCl solution,followed by a mechanical combination process with KB.The results demonstrate that incorporating VMT@KB as an interlayer on a conventional separator enhances the conductivity and limits the LiPSs in the cathode region.The Li-S cell with VMT@KB interlayer shows satisfactory cycle and rate performance,especially in high sulfur loading.It exhibits a remarkable initial discharge capacity of 1225 mAh g^(-1)at 0.5 C and maintains a capacity of 816 mAh g^(-1)after 500 cycles.Besides,the discharge capacity remains 462 mAh g^(-1)even at 6 C.Moreover,the cell with high sulfur loading(8.2 mg cm^(-2))enables stable cycling for 100 cycles at 0.1 C with a discharge capacity of over1000 mAh g^(-1). 展开更多
关键词 VERMICULITE Li-S batteries Modified separators Electrical double layer Lithium polysulfides
在线阅读 下载PDF
Potential reduction of global colorectal cancer,1990–2021 被引量:1
13
作者 Zilin Luo Xuesi Dong +10 位作者 Le Wang Yadi Zheng Chenran Wang Jiaxin Xie Xiaolu Chen Liang Zhao Yongjie Xu Wei Cao Fei Wang Lingbin Du Ni Li 《Journal of the National Cancer Center》 2025年第3期313-321,共9页
Objectives Primary prevention targeting modifiable risk factors would reduce the global burden of colorectal cancer,but the quantitative results are uncertain.We aimed to assess the global burden of colorectal cancer ... Objectives Primary prevention targeting modifiable risk factors would reduce the global burden of colorectal cancer,but the quantitative results are uncertain.We aimed to assess the global burden of colorectal cancer attributed to modifiable lifestyle factors and quantify the potential increase in life expectancy resulting from the elimination of these risk factors.Methods Based on the Global Burden of Disease Study 2021,we examined colorectal cancer deaths and disability-adjusted life years attributed to modifiable risk factors(including smoking,diet low in whole grains,diet low in milk,diet high in red meat,diet low in calcium,diet high in processed meat,and diet low in fiber)at the global,regional,and national levels from 1990 to 2021.The abridged period life table method was utilized to quantify the potential gain in life expectancy from eliminating these risk factors.Results Globally in 2021,57.1%of colorectal cancer deaths and 56.4%of disability-adjusted life years were preventable,with rates of 7.55(4.94–9.64)and 174.67(114.54–222.24)per 100,000 population,respectively.The modifiable burden has diminished in the high,high-middle,and low socio-demographic index quintiles and remained steady in the middle one.However,there is a concerning increase in the low-middle one.In 2021,the elimination of global colorectal cancer attributed to modifiable factors would increase the life expectancy for males and females by 0.107 and 0.109 years,respectively.Conclusion Our results quantitatively demonstrate the substantial burden reduction in colorectal cancer and the significant gain in life expectancy that can be achieved by eliminating modifiable lifestyle factors. 展开更多
关键词 Colorectal cancer Modifiable Risk factors Global burden of disease
暂未订购
Peaked traveling wave solutions of the modified highly nonlinear Novikov equation 被引量:1
14
作者 LI Hui-jun WEN Zhen-shu LI Shao-yong 《Applied Mathematics(A Journal of Chinese Universities)》 2025年第2期375-394,共20页
In this paper,we focus on peaked traveling wave solutions of the modified highly nonlinear Novikov equation by dynamical systems approach.We obtain a traveling wave system which is a singular planar dynamical system w... In this paper,we focus on peaked traveling wave solutions of the modified highly nonlinear Novikov equation by dynamical systems approach.We obtain a traveling wave system which is a singular planar dynamical system with three singular straight lines,and derive all possible phase portraits under corresponding parameter conditions.Then we show the existence and dynamics of two types of peaked traveling wave solutions including peakons and periodic cusp wave solutions.The exact explicit expressions of two peakons are given.Besides,we also derive smooth solitary wave solutions,periodic wave solutions,compacton solutions,and kink-like(antikink-like)solutions.Numerical simulations are further performed to verify the correctness of the results.Most importantly,peakons and periodic cusp wave solutions are newly found for the equation,which extends the previous results. 展开更多
关键词 modified highly nonlinear Novikov equation bifurcation dynamics peakons periodic cusp wave solutions
在线阅读 下载PDF
Assessing the Hydrological and Social Effects of Three Gorges Reservoir Using a Modified SWAT Model 被引量:1
15
作者 Xin Dai Lunche Wang +3 位作者 Qian Cao Zigeng Niu Zengliang Luo Yuhua Luo 《Journal of Earth Science》 2025年第4期1793-1807,共15页
As a crucial human activity,dam construction can profoundly impact the surface hydrology patterns.The Three Gorges Reservoir(TGR),as one of the largest hydraulic engineering projects in the world,has gained continuous... As a crucial human activity,dam construction can profoundly impact the surface hydrology patterns.The Three Gorges Reservoir(TGR),as one of the largest hydraulic engineering projects in the world,has gained continuous attention for its eco-hydrological effects.However,further investigation is necessary to understand the runoff and social impacts of the TGR on the Upper Yangtze River.This study first employed a modified SWAT model to simulate runoff,compared scenarios with and without the TGR,and finally evaluated water supply and demand in the Upper Yangtze River.The results showed a significant increasing trend in the surface water area of the Upper Yangtze River from 2000-2020.The modified SWAT model performs well in simulating the runoff,with Nash-Sutcliffe Efficiency and Percent Bias improved by 0.04-0.30 and 2-31.90,respectively.Scenario simulation results revealed that the TGR reduced seasonal differences in runoff.During the flood season,the runoff volume at the Yichang Station in the scenario with the TGR is lower than in the scenario without the TGR,peaking at 4500 m3/s.Conversely,in the dry season,the runoff volume of the scenario with TGR is higher,with a maximum increase of 1500 m3/s.The region exhibiting the greatest runoff variations is the Yangtze River's main stem in the Three Gorges Reservoir region.Besides,the TGR notably alleviated the water supply-demand imbalance in Chongqing during the winter and spring seasons,with a maximum increase of 0.16 in the supplydemand index.This study can contribute significantly to understanding the natural and social impacts of the TGR from the perspective of hydrological and scenario simulation. 展开更多
关键词 Three Gorges Reservoir the Upper Yangtze River a modified SWAT model water supply water demand
原文传递
Efficacy of modified pancreatic duct stent drainage during endoscopic retrograde cholangiopancreatography for common bile duct stones 被引量:1
16
作者 Li-Jia Qian Chen Xu +1 位作者 Jian-Rong Wang Jun Quan 《World Journal of Gastrointestinal Surgery》 2025年第4期120-131,共12页
BACKGROUND Common bile duct stones pose a high risk of recurrence or disease progression if not promptly treated.However,there is still no optimal treatment approach.AIM To investigate the clinical efficacy of modifie... BACKGROUND Common bile duct stones pose a high risk of recurrence or disease progression if not promptly treated.However,there is still no optimal treatment approach.AIM To investigate the clinical efficacy of modified pancreatic duct stent drainage in endoscopic retrograde cholangiopancreatography(ERCP)for treating common bile duct stones.METHODS This retrospective study included 175 patients with common bile duct stones treated at Taizhou Fourth People’s Hospital between January 1,2021,and November 30,2023.The patients were divided into three groups-the modified pancreatic duct stent drainage group(59 cases),the nasobiliary drainage group(58 cases),and the standard biliary drainage group(58 cases).Preoperative general clinical data,laboratory indicators,and the visual analog scale(VAS)at two time points(24 hours before and after surgery)were compared,along with postoperative complications across the three groups.RESULTS Serum levels of aspartate aminotransferase,alanine aminotransferase,alkaline phosphatase,gamma-glutamyltransferase,total bilirubin,direct bilirubin,Creactive protein,and amylase were significantly lower in the modified pancreatic duct stent drainage group and the standard biliary drainage group than those in the nasobiliary drainage group(P<0.05).However,no statistically significant differences were observed in white blood cells,hemoglobin,or neutrophil levels among the three groups(P>0.05).The standard biliary drainage group had significantly lower VAS scores[(4.36±1.18)points]than those for the modified pancreatic duct stent drainage group[(4.92±1.68)points](P=0.033),and the nasobiliary drainage group[(5.54±1.24)points](P=0.017).There were no statistically significant differences in complication rates across the three groups(P>0.05).CONCLUSION Compared to standard biliary drainage and nasobiliary drainage,the modified pancreatic duct stent used during ERCP for patients with bile duct stones significantly reduced hepatocyte injury,improved liver function parameters,alleviated inflammation and pain,enhanced patient comfort,and demonstrated superior safety. 展开更多
关键词 Modified pancreatic duct stent drainage Endoscopic retrograde cholangiopancreatography Common bile duct stones Curative effect COMPLICATIONS
暂未订购
Nucleoside modified mRNA-lipid nanoparticles as a new delivery platform for the repair of the injured spinal cord
17
作者 Krisztián Pajer Tamás Bellák Antal Nógrádi 《Neural Regeneration Research》 SCIE CAS 2025年第8期2311-2312,共2页
Spinal cord injury and treatment opportunities:The adult mammalian spinal cord has a very limited capacity for spontaneous regeneration due to various intrinsic molecular and cellular factors.Although the spinal cord ... Spinal cord injury and treatment opportunities:The adult mammalian spinal cord has a very limited capacity for spontaneous regeneration due to various intrinsic molecular and cellular factors.Although the spinal cord neurons have the capacity to regenerate their axons,the expression of growth inhibitory factors,lack or suppression of proper guidance cues,and profound inflammatory responses do not permit successful regeneration(Khyeam et al.,2021). 展开更多
关键词 INJURED capacity MODIFIED
暂未订购
Current status of endoscopic resection for small rectal neuroendocrine tumors 被引量:1
18
作者 Jian-Ning Liu Hui Chen Nian Fang 《World Journal of Gastroenterology》 2025年第19期10-27,共18页
Rectal neuroendocrine tumor(rNET)is an indolent malignancy often detected during colonoscopy screening.The incidence of rNET has increased approximately 10-fold over the past 30 years.Most rNETs detected during screen... Rectal neuroendocrine tumor(rNET)is an indolent malignancy often detected during colonoscopy screening.The incidence of rNET has increased approximately 10-fold over the past 30 years.Most rNETs detected during screening endoscopy are small,measuring<10 mm.Current guidelines recommend endoscopic resection for small,well-differentiated rNET using modified endoscopic submucosal resection(mEMR)or endoscopic submucosal dissection.However,the optimal endoscopic treatment method remains uncertain.This paper summarizes the evidence on mEMR with submucosal stretching,mEMR without submucosal stretching,endoscopic submucosal dissection and endoscopic full-thickness resection.Given that rNETs often exhibit submucosal invasion,achieving adequate resection depth is crucial to ensure histological complete resection.mEMR with submucosal stretching appears favorable due to its high rate of histological complete resection,safety and convenience.Risk factors associated with lymph node and distant metastases are also discussed.A treatment algorithm is proposed to facilitate clinical decision-making. 展开更多
关键词 Rectal neuroendocrine tumor Endoscopic resection Endoscopic submucosal dissection Modified endoscopic mucosal resection Histological complete resection Resection depth Risk factor Treatment algorithm
暂未订购
A Verification Theorem for Feedback Nash Equilibrium in Multiple-Player Nonzero-Sum Impulse Game 被引量:1
19
作者 Ruihai Li Yaoyao Tan +1 位作者 Xiaojie Su Jiangshuai Huang 《IEEE/CAA Journal of Automatica Sinica》 2025年第3期648-650,共3页
Dear Editor,This letter addresses the impulse game problem for a general scope of deterministic,multi-player,nonzero-sum differential games wherein all participants adopt impulse controls.Our objective is to formulate... Dear Editor,This letter addresses the impulse game problem for a general scope of deterministic,multi-player,nonzero-sum differential games wherein all participants adopt impulse controls.Our objective is to formulate this impulse game problem with the modified objective function including interaction costs among the players in a discontinuous fashion,and subsequently,to derive a verification theorem for identifying the feedback Nash equilibrium strategy. 展开更多
关键词 impulse game feedback Nash equilibrium multiple player feedback nash equilibrium strategy impulse game problem nonzero sum modified objective function impulse controlsour
在线阅读 下载PDF
Ethical governance of clinical research on the brain-computer interface for mental disorders:a modified Delphi study 被引量:1
20
作者 Qing Zhang Chen Zhang +6 位作者 Haiqing Ji Jing Chen Xingchao Wang Tianhong Zhang Pinan Liu Zhen Wang Yifeng Xu 《General Psychiatry》 2025年第4期308-318,共11页
Background Clinical brain-computer interface(BCI)for mental disorders is an emerging interdisciplinary research field,posing new ethical concerns and challenges,yet lacking practical ethical governance guidelines for ... Background Clinical brain-computer interface(BCI)for mental disorders is an emerging interdisciplinary research field,posing new ethical concerns and challenges,yet lacking practical ethical governance guidelines for stakeholders and the entire community.Aims This study aims to establish a multidisciplinary consensus of principles for ethical governance of clinical BCI research for mental disorders and offer practical ethical guidance to stakeholders involved.Methods A systematic literature review,symposium and roundtable discussions,and a pre-Delphi(round 0)survey were conducted to form the questionnaire for the three-round modified Delphi study.Two rounds of surveys,followed by a third round of independent interviews of 25 experts from BCI-related research domains,were involved.We conducted quantitative analysis of responses and agreements among experts to reveal the consensus and differences regarding the ethical governance of mental BCI research from a multidisciplinary perspective.Results The Delphi panel emphasised important concerns of ethical review practices and ethical principles within the BCI context,identified qualified and highly influential institutions and personnel in conducting and advancing clinical BCI research,and recognised prioritised aspects in the risk-benefit evaluation.Experts expressed diverse opinions on specific ethical concerns,including concerns about invasive technology,its impact on humanity and potential social consequences.Agreement was reached that the practices of ethical governance of clinical BCI for mental disorders should focus on patient voluntariness,autonomy,long-term effects and related assessments of BCI interventions,as well as privacy protection,transparent reporting and ensuring that the research is conducted in qualified institutions with strong data security.Conclusions Ethical governance of clinical research on BCI for mental disorders should include interdisciplinary experts to balance various needs and incorporate the expertise of different stakeholders to avoid serious ethical issues.It requires scientifically grounded approaches,continuous monitoring and interdisciplinary collaboration to ensure evidence-based policies,comprehensive risk assessments and transparency,thereby promoting responsible innovations and protecting patient rights and well-being. 展开更多
关键词 modified Delphi study ethical governance mental disorders establish multidisciplinary consensus principles systematic literature reviewsymposium clinical brain computer interface interdisciplinary research ethical principles
暂未订购
上一页 1 2 156 下一页 到第
使用帮助 返回顶部