检索结果-南通市图书馆

New Development of Acid Regeneration in Steel Pickling Plants

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2008年第4期15卷 1-6页

作者： w F Kladnig ICC Chemical Consulting Vienna A-1193 Austria

For acid pickling heat treated mild steel and steel products, up to the middle of the last century, sulfuric acid was primarily in use, which has been replaced stepwise by hydrochloric acid since the sixties. During this time, the pickling of high alloyed steel with hydrofluoric acid or mixtures for hydrofluoric acid together with nitric acid has also been applied on industrial scale. The technologies used by several plant contractors hereby show considerable differences in their engineering. The study provides a survey of the progress in the state of art of regeneration technology as well as the use of different *** media in the form of a review on existing technologies as well as improvements done within the recent years in the area.

关键词： pickling mild steel high alloyed steel acid recycling technology global emission standard treatment of stack gas

RESEARCH AND DEVELOPMENT OF NEw SUPERALLOY REMELTING PROCES

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2005年第1期18卷 81-90页

作者： w.Xie BaosteelGroupShanghaiNo.5SteelCo. Ltd.Shanghai200940China

Shanghai No.5 Steel Co., Ltd. has recently introduced a set of 5-ton protective atmosphere elec-troslag remelting furnace and a set of 10-ton helium-cooling vacuum arc remelting furnace, both of them are the first one of its kind in China. with these equipment, remelting processes about alloy GH4169, CH2132 and GH738 were researched, the process of producing alloy GH4169 by VIM+VAR+ESR triplex-process was developed, and their effects were discussed.

关键词： superalloy argon shield ESR helium cooling VAR VIM+VAR+ESR

Hormone naive prostate cancer： predicting and maximizing response intervals

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2015年第6期17卷 929-935,I0007,I0008页

作者： Judd w Moul Division of Urology Department of Urology Duke Cancer Institute Duke South Duke University Medical Center Durham NC 27710 USA.

Hormone naive advanced prostate cancer is subdivided into two disease states： biochemical recurrence and traditional M 1 （metastatic） prostate cancer and characterized by no prior hormonal therapy or androgen deprivation therapy （ADT）. In biochemical recurrence/ prostate-specific antigen （PSA） recurrence, men should be risk-stratified based on their PSA doubling time, the Gleason score and the timing of the recurrence. In general, only men who are at high risk should be considered for early/immediate ADT although this is best done using shared decision with the patient. The type of ADT to be used in biochemical recurrence ranging from oral-only peripheral blockade （peripheral androgen deprivation） to complete hormonal therapy （combined androgen blockade [CAB]） remains in debate owing to lack of randomized controlled trials （RCT）. However, there is good RCT support for use of intermittent hormonal therapy （IHT）. There is also limited research on biomarker response （PSA and testosterone decline） to predict prognosis. On the other hand, in the setting of M1 hormone naive prostate cancer, there are many more RCT＇s to inform our decisions. CAB and gonadotrophin-releasing hormone antagonists perhaps provide a slight efficacy advantage while IHT may be slightly inferior with minimal M1 disease. The PSA nadir at 7 months after starting ADT is a powerful prognostic tool for M1 patients. There is growing recognition that serum testosterone （T） control while on ADT is linked to the development of castrate-resistant prostate cancer. Especially for a M 1 patient, maintaining a serum T below 20-30 ng d1-1 prolongs the response to ADT. Novel oral agents （abiraterone and enzalutamide） may soon find use in hormone naive disease and may alter the treatment landscape. Despite over 75 years of experience with ADT, many questions remain, and the field continues to evolve.

关键词： androgen deprivation therapy cancer gonadotrophin-releasing hormone antagonists hormonal therapy luteinizing hormone-releasing hormone agonists prostate prostate-specific antigen testosterone

Structural behaviour of fibre metal laminates subjected to a low velocity impact

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

Science China(Physics,Mechanics & Astronomy) 2011年第6期54卷 1168-1177页

作者： CANTwELL w J University of Liverpool Department of Engineering

Structural impact tests were first presented to cover typical fibre metal laminates (FMLs) subjected a low velocity projectile impact,which produced the corresponding load-displacement traces and deformation/failure modes for the validation of numerical *** element (FE) models were then developed to simulate the impact behaviour of FMLs *** aluminium (alloy grade 2024-0) layer was modelled as an isotropic elasto-plastic material up to the on-set of post failure stage,followed by shear failure and tensile failure to simulate its failure *** glass fibre laminate (woven glass-fibre reinforced composite) layer was modelled as an orthotropic material up to its on-set of damage,followed by damage initiation and evolution using the Hashin *** damage initiation was controlled by failure tensile and compressive stresses within the lamina plane which were primarily determined by *** damage evolution was controlled by tensile/compressive fracture energies combined with both fibre and *** FE models developed for the 2/1,3/2 and 4/3 FMLs plates made with 4-ply and 8-ply glass fibre laminate cores were validated against the corresponding experimental *** correlation was obtained in terms of load-displacement traces,deformation and failure *** validated models were ready to be used to undertake parametric studies to cover FMLs plates made with various stack sequences and composite cores.

关键词： damage Hashin criterion finite element impact FMLs progressive failure

Mechanical Behaviors of Ti-Si-N Coatings Deposited by Bias Sputtering

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2012年第S1期41卷 18-23页

作者： P w Shum Advanced Coatings Applied Research Laboratory(ACARL) Department of Mechanical and Biomedical Engineering(MBE)City University of Hong KongHong KongChina

Ti-Si-N hard coatings were deposited on steel substrates by reactive unbalanced magnetron sputtering from Ti and Si elemental targets in a mixture of Ar and N2 *** influences of negative bias voltage(in the range of-30 to-80 V)on the mechanical properties of the coatings were *** particular,the critical cycle during dynamic impact tests was employed to indicate the bonding strength of the *** was found that the Ti-Si-N coatings prepared at lower constant bias voltages could effectively improve the adhesion and the cyclic impact performance,but their hardness was dropped significantly to 13 GPa at a bias of-30 *** bias voltage values induced greater hardness.A maximum hardness of 47 GPa was obtained at a bias of-60 ***,the coating adhesion was worse in this case,and the number of impact cycles(～8×10 3)that the coatings could endure was much shorter than that of TiN binary coatings(～2×104).On the other hand,the bias voltage was varied linearly from-40 to-60 V during Ti-Si-N *** this circumstance,the hardness of the coatings deposited with the bias-graded configuration remained very high(42 GPa),and the adhesion strength was improved ***,the critical impact cycle could reach as high as 1.8×***,bias-graded deposition can provide an effective processing route to prepare Ti-Si-N superhard coatings with high adhesion strength and impact resistance.

关键词： Ti-Si-N coatings magnetron sputtering bias voltage mechanical properties impact test

Lateral distributions of streamwise velocity in compound channels with partially vegetated floodplains

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2009年第11期52卷 3357-3362页

作者： KNIGHT Donald w School of Civil Engineering The University of Birmingham Birmingham B15 2TT UK

Natural rivers are commonly characterized by a main channel for primary flow conveyance and a floodplain, often partially covered with vegetation such as shrubs or trees, to carry extra flow during floods. The hydraulic resistance due to vegetation on the floodplain typically causes a further reduction of flow velocity and increases the velocity difference between the main channel and the floodplain. As a consequence a strong lateral shear layer leads to the exchange of mass and momentum between the main channel and floodplain, which in turn affects the overall channel conveyance and certain fluvial processes. The prediction of the lateral velocity distribution is important for many flood alleviation schemes, as well as for studies on sediment transport and dispersion in such channels. The present paper proposes a method for predicting the depth-averaged velocity in compound channels with partially vegetated floodplains, based on an analytical solution to the depth-integrated Reynolds-Averaged Navier-Stokes equation with a term included to account for the effects of vegetation. The vegetation is modelled via an additional term in the momentum equation to account for the additional drag force. The method includes the effects of bed friction, drag force, lateral turbulence and secondary flows, via four coefficients f, CD, λ & Γ respectively. The predicted lateral distributions of depth-averaged velocity agree well with the experimental data. The analytical solutions can also be used to predict the distribution of boundary shear stresses, which adds additional weight to the method proposed.

关键词： vegetation compound channel floodplain velocity

Generalized Hopfian Property, a Minimal Haken Manifold, and Epimorphisms Between 3-Manifold Groups

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2002年第1期18卷 157-172页

作者： REID Alan w Department of Mathematics. University of Texas Austin. TX 78712. USA

we address the question that if π_1-surjective maps between closed aspherical 3-manifolds have the same rank on π_1 they must be of non-zero degree. The positive answer is proved for Seifert manifolds, which is used in constructing the first known example of minimal Haken manifold. Another motivation is to study epimorphisms of 3-manifold groups via maps of non-zero degree between 3- manifolds. Many examples are given.

关键词： Non-zero degree maps Epimorphisms 3-Manifolds

Epidemiology of Sexual dysfunction in Asia compared to the rest of the world

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2011年第1期13卷 152-158页

作者： Ronald w Lewis Section of Urology Medical College of Georgia Augusta GA 30912 USA

There have been a limited number of epidemiological studies published on sexual disorders in persons from Asia. This paper aims to assess the reports of sexual dysfunction epidemiological studies published in the English language that involved Asian countries. Key points are summarized in this paper from nine epidemiological papers on sexual dysfunction from Asia that were published in the English language. Seven met the criteria for evidence-based studies reaching a Prins score of at least 10 or more. Papers included in this report came from national and regional representative studies in peer review journals. These results for sexual dysfunction in the nine papers are summarized for various sexual dysfunctions in men and women in Asian countries. In three of these, worldwide data were presented in the same paper allowing comparisons with Asian data on prevalence rates. Detailed descriptions from each of these studies are presented in paragraph form. More detailed data on erectile dysfunction （ED） is presented in a tabular form. Collectively, there seems to be a need for country- and population-specific further descriptive and analytical epidemiological studies in all of the sexual disorders from Asia. This critical review paper should help guide these studies for reachinj[ evidence-based literature standards.

关键词： descriptive epidemiology male and female dysfunction male ED premature ejaculation

The QT interval in Parkinson′s disease:a systematic review

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 Geriatric Cardiology 2024年第9期21卷 855-864页

作者： Simon w Rabkin Division of Cardiology University of British ColumbiaVancouverBC V5Z 1M9Canada

Background PD(PD)is associated with a twofold increase in the risk of death especially sudden death.A predisposing factor for cardiac sudden death is prolongation of the QT *** study evaluated the potential association between QT interval and *** A systematic search was conducted of Medline and EMBASE using the search terms“PD”AND“QT interval”OR“Cardiac Repolarization”to identify *** Seven studies with persons with PD(n=981)and control groups were *** was a significant difference in QT interval comparing patients with PD and persons without *** odds ratio showed a significant(Pwas a significantly longer QT in patients with PD than controls of 10.7±2.8 *** analysis did not show much publication *** only on studies that related the QT interval to the severity of PD as assessed by Hoehn–Yahr classification(n=6),there was a significant(P=0.004)overall correlation between QT interval and the severity of *** was little publication *** data directly examining patients with PD taking any drug than might prolong QT do not support an association between these mediations and QT *** Individuals with PD have a longer QT interval than individuals without *** QT interval is associated with a greater severity of PD and a greater probability of developing more severe *** QT interval should be considered in assessment of PD and possibly as a target for the treatment of PD.

关键词： QT QTc Focus