检索结果-南通市图书馆

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

铝的真空无钎剂钎焊

热处理 1989年第1期49卷 29-32页

作者： c.h.luiten 沈振馨

1.前言自七十年代初以来,汽车工业中铝制热交换器的应用日趋广泛,其原因是铝的重量轻因而可降低能耗。另一方面,当轻质铸铝发动机箱在水冷却系统中的普通黄铜散热器旁,则使腐蚀的危险性增大了。1971年,美国研制了第一台用于车辆空调系... 详细信息

1.前言自七十年代初以来,汽车工业中铝制热交换器的应用日趋广泛,其原因是铝的重量轻因而可降低能耗。另一方面,当轻质铸铝发动机箱在水冷却系统中的普通黄铜散热器旁,则使腐蚀的危险性增大了。1971年,美国研制了第一台用于车辆空调系统蒸发器(图1)(略)无钎剂钎焊的连续式真空炉。几年后,真空无钎剂钎焊技术又应用于车辆散热器的钎焊並推广至日本和欧洲。

关键词：钎焊方法钎剂钎焊技术普通黄铜铝制真空炉真空钎焊水冷却系统空调系统钎料

在线全文

学校读者我要写书评

暂无评论

热处理炉中直接制备气氛及其控制

国外化学热处理 1982年第4期 36-40页

作者： W.Ghring c.h.luiten 朱保华

用燃料气和空气的混合气或只用燃料气直接送入灼热炉膛所产生的气氛,提供了通常由独立的吸热型发生器所制备气氛的一种切合实用的代用品。作者概述了此二种技术的操作、控制和优点,并着重于渗碳应用。前言吸热型炉气氛通常在吸热型发生... 详细信息

用燃料气和空气的混合气或只用燃料气直接送入灼热炉膛所产生的气氛,提供了通常由独立的吸热型发生器所制备气氛的一种切合实用的代用品。作者概述了此二种技术的操作、控制和优点,并着重于渗碳应用。前言吸热型炉气氛通常在吸热型发生器中,通过催化裂解控制的烧料气和空气的混合气而产生。碳势控制是根据化学平衡的假设。

关键词：碳势控制炉膛混合气热处理炉工业炉窑直接制备燃料气气体燃料渗层深度

炉气在热处理炉内的直接发生和控制(超级渗碳法)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

现代机械 1983年第1期 56-60页

作者： W·Goehring c.h.luiten 赵锡新

在热处理炉内,用直接通入未处理过的燃料气或燃料气和空气的混合物,以产生滲碳或保护气氛,是长期来众所周知的。在许多情况下,用薄金属片取样检验碳势,但实际的控制方法是不合适的,会造成无规律的结果。这样,就导致了后来预先热裂气氛(... 详细信息

在热处理炉内,用直接通入未处理过的燃料气或燃料气和空气的混合物,以产生滲碳或保护气氛,是长期来众所周知的。在许多情况下,用薄金属片取样检验碳势,但实际的控制方法是不合适的,会造成无规律的结果。这样,就导致了后来预先热裂气氛(吸热型气体)的研究,基于设想的化学平衡,可以测量和控制碳势。对于活性渗碳,增加碳氢化合物并须同吸热型气体反应产生渗碳气氛。这种方法在原则

关键词：渗碳层表面层碳势控制快速渗碳热处理炉工业炉窑炉气

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

真空炉渗碳

热处理技术与装备 1982年第3期 37-39页

作者： c.h.luiten F.LIMQUE F.BLESS 王宏印一机部郑州机械研究所

在真空炉内进行热处理有许多优点,这已为人们所熟知。除了中性处理外,由于技术的发展,真空炉的用途更加广泛。向真空炉内注入碳氢化合物,比如甲烷或丙烷,便可进行渗碳。为了防止渗碳气体在炉内出观紊流,可以添加纯氮,增加炉压,以便采用... 详细信息

在真空炉内进行热处理有许多优点,这已为人们所熟知。除了中性处理外,由于技术的发展,真空炉的用途更加广泛。向真空炉内注入碳氢化合物,比如甲烷或丙烷,便可进行渗碳。为了防止渗碳气体在炉内出观紊流,可以添加纯氮,增加炉压,以便采用机械手段使炉气更好流通。真空渗炉温度一般为900～1050℃,若

关键词：渗碳甲烷丙烷碳氢化合物含碳量炉气表面硬化沼气烷烃电炉真空炉渗碳温度

Status and prospects for symmetric organic redox flow batteries

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy chemistry 2025年第1期100卷 125-143页

作者： Md Al Raihan c.Adam Dyker Department of chemistry University of New Brunswick

As environmental concerns from fossil fuel consumption intensify, large-scale energy storage becomes imperative for the integration of renewable sources like wind, hydro, and solar with the electrical *** flow batteries, particularly those employing organic molecules, are positioned as a key technology for this purpose. This review explores the growing field of symmetric organic redox flow batteries(ORFBs) within this context. Unlike traditional asymmetric designs based on unique active materials for each electrode, symmetric ORFBs involve a single bipolar species for both electrodes. This review highlights the benefits of a symmetric design, and categorizes five distinct classes of organic bipolar molecules used in both aqueous and non-aqueous solvents. By providing a comprehensive overview of their cell cycling and performance characteristics, the strengths and weaknesses of the diverse categories of bipolar molecules are highlighted for both solvent systems, as are opportunities for future development. This should guide new research directions and advance the development of practical symmetric ORFBs.

关键词： Redox flow battery Symmetric battery Organic battery Aqueous electrolyte Non-aqueous electrolyte

Neuroinflammation as a therapeutic target in huntington's disease

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第3期20卷 817-818页

作者： Andrea Kwakowsky Thulani h.Palpagama center for Brain Research and Department of Anatomy and Medical Imaging Faculty of Medical and Health SciencesUniversity of AucklandAucklandNew Zealand Pharmacology and Therapeutics School of MedicineGalway Neuroscience CentreUniversity of GalwayGalwayIreland

In 1872, George huntington presented his essay “On chorea” to the Meigs and Mason Academy of Medicine and, in doing so, detailed a disease that would later bear his name. huntington's disease(hD) is a genetic, neurodegenerative disease that manifests as the loss of motor control,cognitive impairment,and mood and psychiatric changes in paents.

关键词： huntington inflammation Medicine

Glial response in the midcingulate cortex in huntington’s disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第1期20卷 207-208页

作者： Thulani h.Palpagama Andrea Kwakowsky center for Brain Research and Department of Anatomy and Medical Imaging Faculty of Medical and Health SciencesUniversity of AucklandAucklandNew Zealand Pharmacology and Therapeutics School of MedicineGalway Neuroscience CenterUniversity of GalwayGalwayIreland

huntington’s disease(hD)is a genetic disease characterized by the progressive degeneration of the striatum and *** can present with a variety of symptoms that can broadly be classified into motor symptoms,inclusive of choreatic movements and rigidity,mood and psychiatric symptoms,such as depression and apathy,and cognitive symptoms,such as cognitive *** causal mutation underlying hD results from an expansion of a cAG repeat sequence on the IT15 gene,resulting in the formation and accumulation of a mutant huntingtin protein.

关键词： huntington degeneration cortex

Acquired sensorineural hearing loss,oxidative stress,and microRNAs

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第9期20卷 2513-2519页

作者： Desmond A.Nunez Ru c.Guo Division of Otolaryngology–head&Neck Surgery Department of SurgeryFaculty of MedicineThe University of British ColumbiaVancouverBCCanada Division of Otolaryngology–head&Neck Surgery Gordon&Leslie Diamond Health Care CentreVancouver General HospitalVancouverBCCanada Faculty of Medicine–The University of British columbia VancouverBCCanada

hearing loss is the third leading cause of human ***-related hearing loss,one type of acquired sensorineural hearing loss,is largely responsible for this escalating global health ***-induced,ototoxic,and idiopathic sudden sensorineural are other less common types of acquired hearing *** etiology of these conditions is complex and multi-fa ctorial involving an interplay of genetic and environmental *** stress has recently been proposed as a likely linking cause in most types of acquired sensorineural hearing *** non-coding RNA sequences known as microRNAs(miRNAs)have increasingly been shown to play a role in cellular hypoxia and oxidative stress responses including promoting an apoptotic *** hair cell death is a central histopathological finding in sensorineural hearing *** these cells do not regenerate in humans,it underlies the irreversibility of human age-related hearing *** EMBASE,Ovid MEDLINE,Web of Science core collection,and *** databases over the period August 1,2018 to July 31,2023 were searched with"hearing loss,""hypoxamiRs,""hypoxia,""microRNAs,""ischemia,"and"oxidative stress"text words for English language primary study publications or registered clinical *** red clinical trials known to the senior author we re also assessed.A total of 222studies were thus *** excluding duplicates,editorials,retra ctions,secondary research studies,and non-English language articles,39 primary studies and clinical trials underwent full-text *** resulted in 11 animal,in vitro,and/or human subject journal articles and 8 registered clinical trial database entries which form the basis of this narrative *** miR-34a and miR-29b levels increase with age in *** miRNAs were demonstrated in human neuroblastoma and murine cochlear cell lines to target Sirtuin 1/peroxisome proliferato r-activated receptor gamma coactivator-1-alpha(SIRT1/P Gc-1α),SIRT

关键词： hearing loss hypoxia microRNAs oxidative stress sensorineural

comparative chemical sensor for detection of chromium(Ⅵ) in aqueous solution

在线全文

学校读者我要写书评

暂无评论

Optoelectronics Letters 2025年第1期21卷 21-27页

作者： Sura h.AL-REKABI A.A.ALWAhIB Electrical Technique Department Al Suwayrah Technical Institute Middle Technical University Laser and Optoelectronics Department University of Technology-Iraq

A process for purifying aqueous solutions containing heavy and toxic metals such as chromium（cr） has been investigated. One of the extremely harmful pollutants in rivers and seawater is the heavy metal ions due to their direct impacts on human, animals and plants are hexavalent cr（Ⅵ）. consequently, highly sensitive sensor to detect cr is essential. Surface plasmon resonance（SPR） technique has attracted huge research interest in detecting heavy metals specifically. In this study, three types of prism-based SPR sensor, gold（Au）/silver（Ag）, Au/polyaniline（PANI） and Au/titanium dioxide（TiO2） nanostructured films, are investigated as potential sensing material to detect the presence of cr（Ⅵ） ions in water. The base Au layer with thickness of 48.3 nm is deposited on a glass slide for all sensors. For Au/Ag, Au/PANI nanofibers and Au/TiO2sensor films, the cr（Ⅵ） concentration is varied from 1 ppm to 15 ppm with sensitivity of 0.270 °ppm-1, 0.082 °ppm-1and 0.039 °ppm-1, respectively. Based on these results, the Au/PANI nanofibers are the most sensitive to cr（Ⅵ） among the tested sensing materials.

关键词： Titanium dioxide