检索结果-南通市图书馆

中医药及活性成分靶向M1/M2巨噬细胞极化平衡治疗慢性阻塞性肺疾病的研究进展

在线全文

学校读者我要写书评

暂无评论

中国中药杂志 2024年第16期49卷 4298-4312页

作者：邓亚胜范燕萍郑艺清习兰花李汶玥梁天薇黄慧林江广西中医药大学基础医学院广西南宁530200 海南省中医院海南海口570100

慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)是一种因长期吸入有毒颗粒,特别是吸烟所导致的进行性肺功能障碍(疾病),持续接触这些有害物质会引发异常的炎症反应,进而造成呼吸系统永久性损伤,最终导致不可逆的病理变... 详细信息

慢性阻塞性肺疾病(chronic obstructive pulmonary disease,COPD)是一种因长期吸入有毒颗粒,特别是吸烟所导致的进行性肺功能障碍(疾病),持续接触这些有害物质会引发异常的炎症反应,进而造成呼吸系统永久性损伤,最终导致不可逆的病理变化。肺巨噬细胞(lung macrophages,LMs)是关键的先天免疫效应细胞,在识别、吞噬和清除病原体,以及处理吸入的有害颗粒物(如香烟烟雾和颗粒物PM)方面扮演着重要角色。LMs在炎症因子的激活下向M1或M2方向极化,分别发挥着促炎/抗炎作用,参与COPD肺实质的损伤(肺气肿)和修复(气道重塑)的全过程。它们还负责吞噬和清除凋亡或坏死的组织细胞,共同维护COPD患者肺内的微环境稳定。现代研究揭示,巨噬细胞极化在COPD的发病与发展中占据着举足轻重的地位,其具备减轻气道炎症、抑制组织重塑,以及抗氧化应激等多重功效,因此被视为COPD治疗的潜在靶点。近年来,中医药及其活性成分靶向M1/M2巨噬细胞极化平衡治疗COPD的研究成为热点领域,以巨噬细胞极化状态的调节为目标,通过中医药及其活性成分的干预平衡COPD患者肺组织中的炎症反应,并促进修复过程。该文深入探讨了近年中医药及其活性成分在这一领域的研究成果,旨在为COPD的精准诊疗策略提供新的科学依据和有力支持。

关键词：慢性阻塞性肺疾病巨噬细胞极化肺巨噬细胞中医药有效成分研究进展

Remaining Useful Life Prediction Method for Multi-Component System Considering Maintenance:Subsea Christmas Tree System as A Case Study

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2024年第2期38卷 198-209页

作者： WU Qi-bing CAI Bao-ping fan Hong-yan WANG Guan-nan RAO Xi GE Weifeng SHAO Xiao-yan LIU Yong-hong CNOOC Safety Technology Services Co. Ltd.Tianjin 300456China College of Mechanical and Electronic Engineering China University of PetroleumQingdao 266580China CNOOC EnerTech Safety&Environmental Protection BranchTianjin 300456China

Maintenance is an important technical measure to maintain and restore the performance status of equipment and ensure the safety of the production process in industrial production,and is an indispensable part of prediction and health ***,most of the existing remaining useful life(RUL)prediction methods assume that there is no maintenance or only perfect maintenance during the whole life cycle;thus,the predicted RUL value of the system is obviously lower than its actual operating *** complex environment of the system further increases the difficulty of maintenance,and its maintenance nodes and maintenance degree are limited by the construction period and working conditions,which increases the difficulty of RUL *** RUL prediction method for a multi-omponent system based on the Wiener process considering maintenance is *** performance degradation model of components is established by a dynamic Bayesian network as the initial model,which solves the uncertainty of insufficient data *** on the experience of experts,the degree of degradation is divided according to Poisson process simulation random failure,and different maintenance strategies are used to estimate a variety of condition maintenance *** example of a subsea tree system is given to verify the effectiveness of the proposed method.

关键词： remaining useful life Wiener process dynamic Bayesian networks maintenance subsea Christmas tree system

Silencing transformer and transformer-2 in Zeugodacus cucurbitae causes defective sex determination with inviability of most pseudomales

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第3期23卷 938-947页

作者： Qin Ma Zizhen fan ping Wang Siya Ma Jian Wen Fengqin Cao Xianwu Lin Rihui yan Key Laboratory of Green Prevention and Control of Tropical Plant Diseases and Pests of Ministry of Education School of Plant ProtectionHainan UniversityHaikou 570228China School of Life Sciences HainanUniversityHaikou 570228China Hainan Yazhou Bay Seed Lab Sanya 572000China

transformer is a switch gene for sex determination in many insects, which cooperates with transformer-2 that is expressed in both sexes to regulate female differentiation, particularly in dipterans. Zeugodacus cucurbitae(Coquillett) is a very destructive pest worldwide, however, its sex determination pathway remains largely uncharacterized. Here, we show that the female sex ratio is sharply reduced with knockdown of either transformer or transformer-2 by RNA interference in early embryos of Z. cucurbitae. Most of the males grown from the embryos with transient transformer and transformer-2 suppression mated with wild-type females and produced mixed sex progeny, with one exception that produced only female progeny, and all of the few remaining males failed to mate with wild-type females and produced no progeny. The exceptional male and those males with mating failure were XX pseudomales as determined by the detection of Y chromosome-linked Maleness-on-the-Y, indicating that most XX pseudomales are not viable. The phenotypes of transformer and transformer-2 suggest that they play a key role in regulating sex determination and are required for female sexual development of Z. cucurbitae. Our results will be beneficial to the understanding of sex determination in Z. cucurbitae and can facilitate the development of genetic sexing strains for its biological control.

关键词： Zeugodacus cucurbitae transformer transformer-2 sex determination RNA interference biological control

Crystal Structure of Scheelite-type LiTb(WO4)2 and Multi-color Emitting Properties Doped by Eu^3+

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2020年第2期39卷 310-320,187页

作者： XUE Ya-Li ZHAO Dan CUI Xiao-Qi HAN Xiao-yang LIU Bao-Zhong fan yan-ping College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo 454000China

Single crystal of lithium terbium tungstate LiTb(WO4)2 has been grown by the flux method. The crystal structure was refined from single-crystal X-ray data. It crystallizes in tetragonal system, space group I41/a with a = 5.1749(9), c = 11.1953(19) ?, V = 299.81(12) ?~3, Z = 2, Mr = 661.56, Dc = 7.328 g/cm^3, F(000) = 560, μ(MoKα) = 49.94 mm^(-1), R(F^2 > 2σ(F^2)) = 0.026 and wR(F^2) = 0.070. It features a typical scheelite-type structure composed of two-direction packing of isolated WO4 tetrahedra. Li and Tb atoms in the structure occupy the same crystallographic site. Moreover, a series of solid solution phosphors LiTb(1-x)Eux(WO4)2(x = 0.004~0.1) were synthesized by high temperature solid-state reactions. The phosphors could be effectively excited by a wavelength range from 379 to 487 nm, which matches well with the UV and near-UV LED chip. The emission color of the phosphor can be tuned from green, through yellow to red by simply adjusting the relative Eu^(3+) and Tb^(3+) concentration due to the Tb^(3+) to Eu^(3+) energy transfer.

关键词： rare earth compounds crystal structure optical properties phosphor charge transfer

Application of immune checkpoint inhibitors and microsatellite instability in gastric cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第21期30卷 2734-2739页

作者： Shi-yan yan Jian-Gao fan Department of Gastroenterology Xinhua HospitalShanghai Jiaotong University School of MedicineShanghai 200092China

In this editorial we comment on the article by Li published in the recent issue of the World Journal of *** focus specifically on the application of immune checkpoint inhibitors(ICIs)and microsatellite instability(MSI)in gastric cancer(GC).The four pillars of GC management have long been considered,including surgery,chemotherapy,radiotherapy and targeted ***,immunotherapy has recently emerged as a“fifth pillar”,and its use is rapidly *** are four principal strategies for tumor immunotherapy:ICIs,tumor vaccines,adoptive immunotherapy and nonspecific *** them,ICIs are the most advanced and widespread type of cancer immunotherapy for *** breakthrough results for ICIs have paved the way to a new era of cancer *** particular,inhibition of the PD-1/PD-L1 axis with ICIs,including nivolumab and pembrolizumab,has emerged as a novel treatment strategy for advanced ***,these therapies are sometimes associated with often subtle,potentially fatal immune-related adverse events(irAEs),including dermatitis,diarrhea,colitis,endocrinopathy,hepatotoxicity,neuropathy and *** must be aware of these irAEs and improve the detection of these processes to prevent inappropriate discharges,emergency department revisits,and downstream *** studies have revealed that MSI-high or mismatch-repair-deficient tumors,regardless of their primary site,have a promising response to ***,it is important to detect MSI before applying ICIs for treatment of GC.

关键词： Gastric cancer Immune checkpoint inhibitors Microsatellite instability Immunotherapy Immune-related adverse events

Climatic implications in earlywood and latewood width indices of Chinese pine in north central China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Forestry Research 2024年第3期35卷 143-153页

作者： Kaixuan yang Junzhou Zhang Haowen fan Yuan yan College of Geographic Sciences Qinghai Normal UniversityXining 810016People's Republic of China Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation(Ministry of Education) Xining 810016People's Republic of China Key Laboratory of Western China's Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730030People's Republic of China Gansu Liancheng Forest Ecosystem Field Observation and Research Station Lanzhou UniversityLanzhou 730333People's Republic of China School of Geography and Information Engineering University of GeoscienceWuhan 430074People's Republic of China

Latewood width(LWW)indices of trees are considered a reliable proxy of summer precipitation in the Northern ***,the strong coupling and high correlation between earlywood width(EWW)and LWW indices often prevent registration of climate signals of the LWW *** this study,328-year-long earlywood width and latewood width chronologies were developed from Chinese pine at two sites in the Hasi Mountains,north central *** climate responses of these chronologies were analyzed and the LWW index used to derive sum-mer precipitation *** analyses showed that LWW was particularly influenced by earlywood growth and recorded stronger climate signals of the previous year as EWW,rather than those of the current year with infrequent summer climate ***,after removing the effect of earlywood growth using a simple regression model,the adjusted LWW chronology(LWW_(adj))showed a strong relationship with July precipitation in dry *** suggests that the LWW_(adj) chronology has the potential to be used to investigate long-term variability in summer precipitation in drought-limited regions.

关键词： Dendroclimatology Latewood width Climate response Summer precipitation Earlywood effect

Bioinspired designs in active metal-based batteries

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第2期17卷 587-601页

作者： fan Zhang Ting Liao Cheng yan Ziqi Sun School of Chemistry and Physics Queensland University of TechnologyGeorge StreetBrisbaneQLD 4000Australia School of Mechanical Medical and Process Engineering Queensland University of TechnologyGeorge StreetBrisbaneQLD 4000Australia QUT Centre for Materials Science Queensland University of TechnologyGeorge StreetBrisbaneQLD 4000Australia

Active metal-based batteries are drawing increased attention because of their inherent high energy density and specific *** grand challenges,such as dendrite growth,electrode degradation,rapid performance fading,etc.,have limited their practical ***,which involves taking cues from the structures and functions of the natural world,can lead to a wealth of conceptually fresh approaches to regulator the metal ion transportation to achieve a dendrite-free metal plating,thwart the side-reaction reactions,and retard the structural distortions,for a more reliable and secure operation of active metal-based *** this review,we concentrate on the fabrication and application of bioinspired designs in active metal-based batteries with enhanced performance,along with discussion on the challenges and opportunities associated with this promising *** anticipate that this review can offer some insights into the development of functional materials by learning from nature and provide some approaches for the innovations of either the battery structures or the energy materials for metal-based batteries.

关键词： bioinspired materials energy storage devices metal-based batteries

Channel assignment and power allocation for throughput improvement with PPO in B5G heterogeneous edge networks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Digital Communications and Networks 2024年第1期10卷 109-116页

作者： Xiaoming He Yingchi Mao Yinqiu Liu ping ping yan Hong Han Hu The College of Computer and Information Hohai UniversityNanjingChina The Key Laboratory of Water Big Data Technology of Ministry of Water Resources Hohai UniversityNanjing China The School of Computer Science and Engineering Nanyang Technological UniversitySingapore The College of Textile and Clothing Engineering Soochow UniversitySuzhouChina The College of Internet of Things Nanjing University of Posts and TelecomurunicationsNanjingChina

In Beyond the Fifth Generation(B5G)heterogeneous edge networks,numerous users are multiplexed on a channel or served on the same frequency resource block,in which case the transmitter applies coding and the receiver uses interference ***,uncoordinated radio resource allocation can reduce system throughput and lead to user inequity,for this reason,in this paper,channel allocation and power allocation problems are formulated to maximize the system sum rate and minimum user achievable *** the construction model is non-convex and the response variables are high-dimensional,a distributed Deep Reinforcement Learning(DRL)framework called distributed Proximal Policy Optimization(PPO)is proposed to allocate or assign ***,several simulated agents are trained in a heterogeneous environment to find robust behaviors that perform well in channel assignment and power ***,agents in the collection stage slow down,which hinders the learning of other ***,a preemption strategy is further proposed in this paper to optimize the distributed PPO,form DP-PPO and successfully mitigate the straggler *** experimental results show that our mechanism named DP-PPO improves the performance over other DRL methods.

关键词： B5G Heterogeneous edge networks PPO Channel assignment Power allocation Throughput

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

一种声表面波转矩传感器快速解调方法设计

上海交通大学学报 2015年第8期49卷 1096-1100,1107页

作者：范彦平吉小军蔡萍上海交通大学电子信息与电气工程学院上海200240

针对多个谐振器组成的无线无源声表面波(SAW)转矩传感器阅读过程复杂、耗时长的问题,利用SAW谐振器的频率响应特性设计了一种基于时域的转矩传感器快速解调方法.分析了SAW谐振器的响应特性并设计了信号的截断与去噪声方法,以及周期计算... 详细信息

针对多个谐振器组成的无线无源声表面波(SAW)转矩传感器阅读过程复杂、耗时长的问题,利用SAW谐振器的频率响应特性设计了一种基于时域的转矩传感器快速解调方法.分析了SAW谐振器的响应特性并设计了信号的截断与去噪声方法,以及周期计算方法.根据设定的高频与响应信号周期的关系确定各个谐振器谐振频率的范围,然后通过谱估计具有最大周期的信号以解调出频率.提出的扫描方法只需采集一路信号,即降低了阅读器硬件系统的复杂性,同时在时域中简化了信号解调算法.通过实验测试了该扫描方法,完成一次搜索过程只需521ms,而传统的2路正交信号(IQ)扫描方法需要828ms.实验结果表明:设计的算法与IQ法相比扫描速度提高了37.1%,验证了该算法的有效性.

关键词：声表面波转矩传感器无线无源信号解调