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Building Conceptual Knowledge Of Fraction Operations Among Pre-Service Teachers: Effect Of A Representation-Based Teaching Approach Within A Teacher Education Program, Elise J. Thurtell, Patricia A. Forrester, Mohan Chinnappan

Faculty of Social Sciences - Papers (Archive)

A deep understanding of fraction concepts and operations is necessary if pre-service teachers (PSTs) are to present the concepts in multiple forms to learners. Such an understanding needs to be grounded in rich conceptual knowledge. In the present study, we explore the development of this understanding by supporting a cohort of 103 PSTs, who had previously demonstrated poor conceptual understanding of fraction concepts and operations, with a Representational Reasoning in Teaching and Learning (RRTL) approach aimed at strengthening their conceptual knowledge. A comparison of pre- and post-test results indicated that participants showed a significant improvement in shifting the balance of …

Effect Of Water-Based Nanolubricant Containing Nano-Tio2 On Friction And Wear Behaviour Of Chrome Steel At Ambient And Elevated Temperatures, Hui Wu, Fanghui Jia, Jingwei Zhao, Shuiquan Huang, Lianzhou Wang, Sihai Jiao, Han Huang, Zhengyi Jiang

Faculty of Engineering and Information Sciences - Papers: Part B

A novel experimental method was developed through a ball-on-disk tribometer to study the friction and wear behaviour of a chrome steel at temperatures of 25, 200 and 500 °C. Water-based nanolubricants containing different concentrations of nano-TiO2 from 0.4 to 8.0 wt% were used to investigate their effects on friction-reduction and anti-wear mechanisms, in comparison to the benchmarks under dry and water conditions. The results show that the water-based nanolubricants can significantly reduce coefficient of friction (COF) and improve wear resistance of the chrome steel at both ambient and elevated temperatures. In particular, the use of nanolubricant containing an optimal concentration …

Evidence For Sample Selection Effect And Hawthorne Effect In Behavioural Hiv Prevention Trial Among Young Women In A Rural South African Community, Molly Rosenberg, Audrey Pettifor, Rhian Twine, James Hughes, F Gomez-Olive, Ryan Wagner, Afolabi Sulaimon, Stephen Tollman, Amanda Selin, Catherine L. Mac Phail, Kathleen Kahn

Faculty of Social Sciences - Papers (Archive)

Objectives We examined the potential influence of both sample selection effects and Hawthorne effects in the behavioural HIV Prevention Trial Network 068 study, designed to examine whether cash transfers conditional on school attendance reduce HIV acquisition in young South African women. We explored whether school enrolment among study participants differed from the underlying population, and whether differences existed at baseline (sample selection effect) or arose during study participation (Hawthorne effect). Methods We constructed a cohort of 3889 young women aged 11-20 years using data from the Agincourt Health and socio-Demographic Surveillance System. We compared school enrolment in 2011 (trial start) …

Effect Of Cannabis Use In People With Chronic Non-Cancer Pain Prescribed Opioids: Findings From A 4-Year Prospective Cohort Study, Gabrielle Campbell, Wayne Hall, Amy Peacock, Nicholas Lintzeris, Raimondo Bruno, Briony K. Larance, Suzanne Nielsen, Milton Cohen, Gary Chan, Richard P. Mattick, Fiona Blyth, Marian D. Shanahan, Timothy Dobbins, Michael P. Farrell, Louisa Degenhardt

Faculty of Social Sciences - Papers (Archive)

Background Interest in the use of cannabis and cannabinoids to treat chronic non-cancer pain is increasing, because of their potential to reduce opioid dose requirements. We aimed to investigate cannabis use in people living with chronic non-cancer pain who had been prescribed opioids, including their reasons for use and perceived effectiveness of cannabis; associations between amount of cannabis use and pain, mental health, and opioid use; the effect of cannabis use on pain severity and interference over time; and potential opioid-sparing effects of cannabis. Methods The Pain and Opioids IN Treatment study is a prospective, national, observational cohort of people …

Radiosensitisation Enhancement Effect Of Brudr And Ta2o5 Nsps In Combination With 5-Fluorouracil Antimetabolite In Kilovoltage And Megavoltage Radiation, Marjorie Mcdonald, Sianne Oktaria, Konstantin K. Konstantinov, Anatoly B. Rosenfeld, Michael L. F Lerch, Stephanie Corde, Moeava Tehei

Faculty of Engineering and Information Sciences - Papers: Part B

This article demonstrates in vitro a synergistic effect on 9L gliosarcoma cells when exposed to bromodeoxyuridine (BrUdR) and a low concentration (100 times lower than the IC50) of 5-Fluorouracil (5-FU), in combination with x-ray irradiation. The synergy is brought about by several important factors including the x-ray beam energy, atomic number of the BrUdR (Z = 35), effectiveness of 5-FU in reducing the available repair processes and distribution of the BrUdR in and around the 9L cells (32% of the total substitution of BrUdR for thymidine into nucleus DNA). Our results show that the synergistic effect, evident in an optimised …

Effect Of Schooling On Age-Disparate Relationships And Number Of Sexual Partners Among Young Women In Rural South Africa Enrolled In Hptn 068, Marie Stoner, Jessie Edwards, William Miller, Allison Aiello, Carolyn Halpern, Aimee Julien, Amanda Selin, James Hughes, Jing Wang, F Gomez-Olive, Ryan Wagner, Catherine L. Mac Phail, Kathleen Kahn, Audrey Pettifor

Faculty of Social Sciences - Papers (Archive)

Background:

Attending school may have a strong preventative association with sexually transmitted infections among young women, but the mechanism for this relationship is unknown. One hypothesis is that students who attend school practice safer sex with fewer partners, establishing safer sexual networks that make them less exposed to infection.

Setting:

We used longitudinal data from a randomized controlled trial of young women aged 13–20 years in the Bushbuckridge district, South Africa, to determine whether the percentage of school days attended, school dropout, and grade repetition are associated with having a partner 5 or more years older (age–disparate) and with the …

The Delaying Effect Of Stigma On Mental Health Help-Seeking In Sri Lanka, Sunera M. Fernando, Frank P. Deane, Hamish J. Mcleod

Faculty of Social Sciences - Papers (Archive)

Background: Mental health stigma has been associated with delays in seeking treatment. Aims: To describe perceived stigma experienced by patients and carers in Sri Lanka and to determine the effects of stigma on help-seeking delay. Methods: Survey of outpatients and family carers (n = 118 dyads) attending two psychiatric hospitals in Sri Lanka, using the Disclosure and Discrimination subscales of the Stigma Scale. Results: Stigma was positively related to help-seeking delay for carers but not patients. Public stigma experienced by carers accounted for 23% of the variance in help-seeking delay. Conclusion: Reducing stigma may reduce help-seeking delays during the course …

Effect Of Scattered Electrons On The 'Magic Plate' Transmission Array Detector Response, Z A. Alrowaili, Michael L. F Lerch, Marco Petasecca, Martin G. Carolan, Anatoly B. Rosenfeld

Faculty of Engineering and Information Sciences - Papers: Part A

Transmission type detectors can provide a measure of the energy fluence and if they are real-time systems that do not significantly attenuate the radiation beam have a distinct advantage over the current method as Quality Assurance (QA) could in principle be done during the actual patient treatment. The use of diode arrays in QA holds much promise due to real-time operation and feedback when compared to other methods e.g. films which are not real-time. The goal of this work is to describe the characterization of the radiation response of a silicon diode array called the Magic Plate (MP) when operated …

Strain-Induced Ferrite Formation And Its Effect On Mechanical Properties Of A Dual Phase Steel Produced Using Laboratory Simulated Strip Casting, Zhiping Xiong, Ahmed A. Saleh, Andrii Kostryzhev, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part B

Thermo-mechanical processing of a strip cast dual phase (DP) steel was carried out using a Gleeble thermo-mechanical simulator. The effect of deformation temperatures in the range from 1050 to 700 °C on the microstructure evolution was investigated using optical, scanning and transmission electron microscopy along with electron backscattering diffraction (EBSD). Strain-induced ferrite (SIF) formation was observed following austenite deformation (∼0.41 reduction) in the 800–700 °C temperature range, leading to a ferrite grain refinement down to 3.1 ± 2.3 μm. A novel segmentation procedure was applied to separate selected EBSD maps into polygonal ferrite, SIF and second phase regions (bainite/martensite). Following …

In Vitro Investigation Of The Dose-Rate Effect On The Biological Effectiveness Of Megavoltage X-Ray Radiation Doses, Sianne Oktaria, Michael L. F Lerch, Anatoly B. Rosenfeld, Moeava Tehei, Stephanie Corde

Faculty of Engineering and Information Sciences - Papers: Part B

Radiation therapy is rapidly evolving toward the delivery of higher dose rates to improve cancer treatment. In vitro experiments were performed to investigate the response of 9L and MCF-7 cancer cell lines, exposed to 10 MV X-ray radiations. Up to 8 Gy was delivered at a dose-rate of 50 cGy/min compared to 5 Gy/min. The data obtained emphasizes the importance of taking into account not only the physical, but also the radiobiological parameters, when planning a particular cancer treatment.

Effect Of Groove Spacing On Bond Strength Of Near-Surface Mounted (Nsm) Bonded Joints With Multiple Frp Strips, Shi Shun Zhang, Tao Yu

Faculty of Engineering and Information Sciences - Papers: Part B

In the strengthening of existing deficient structures using the near-surface mounted (NSM) FRP method, a group of parallel NSM FRP strips are usually needed to meet the capacity enhancement requirement. When the groove spacing (i.e., the net distance between grooves) is relatively small, the bond behaviour of each NSM FRP strip is detrimentally influenced by the adjacent grooves/FRP strips, and such detrimental effect should be taken into account for a safe design of the NSM FRP strengthening system. All the existing models, however, have been proposed for NSM bonded joints with a single FRP strip and thus cannot consider the …

The Effect Of Imputing Missing Clinical Attribute Values On Training Lung Cancer Survival Prediction Model Performance, Mohamed S. Barakat, Matthew Field, Aditya K. Ghose, David Stirling, Lois C. Holloway, Shalini K. Vinod, Andre Dekker, David Thwaites

Faculty of Engineering and Information Sciences - Papers: Part B

According to the estimations of the World Health Organization and the International Agency for Research in Cancer, lung cancer is the most common cause of death from cancer worldwide. The last few years have witnessed a rise in the attention given to the use of clinical decision support systems in medicine generally and in cancer in particular. These can predict patients' likelihood of survival based on analysis of and learning from previously treated patients. The datasets that are mined for developing clinical decision support functionality are often incomplete, which adversely impacts the quality of the models developed and the decision …

The Effect Of Nursing Participation In The Design Of A Critical Care Information System: A 4 Case Study In A Chinese Hospital, Yanhong Qin, Ranyun Zhou, Qiong Wu, Xiaodi Huang, Xinli Chen, Weiwei Wang, Xun Wang, Hua Xu, Jing Zheng, Siyu Qian, Changqing Bai, Ping Yu

Faculty of Engineering and Information Sciences - Papers: Part B

No abstract provided.

The Effect Of Sailuotong (Slt) On Neurocognitive And Cardiovascular Function In Healthy Adults: A Randomised, Double-Blind, Placebo Controlled Crossover Pilot Trial, Genevieve Z. Steiner, Alan Yeung, Jian Liu, David A. Camfield, Frances M. De Blasio, Andrew Pipingas, Andrew Scholey, Con Stough, Dennis Chang

Faculty of Social Sciences - Papers (Archive)

Background: Sailuotong (SLT) is a standardised herbal medicine formula consisting of Panax ginseng, Ginkgo biloba, and Crocus sativus, and has been designed to enhance cognitive and cardiovascular function. Methods: Using a randomised, double-blind, placebo controlled crossover design, this pilot study assessed the effect of treatment for 1 week with SLT and placebo (1 week washout period) on neurocognitive and cardiovascular function in healthy adults. Sixteen adults completed a computerised neuropsychological test battery (Compass), and had their electroencephalographic (EEG) activity and cardiovascular system function assessed. Primary outcome measures were cognitive test scores and oddball task event-related potential (ERP) component amplitudes. Secondary …

Effect Of Deformation On Microstructure And Mechanical Properties Of Dual Phase Steel Produced Via Strip Casting Simulation, Zhiping Xiong, Andrii Kostryzhev, Nicole Stanford, Elena V. Pereloma

Faculty of Engineering and Information Sciences - Papers: Part A

The strip casting is a recently appeared technology with a potential to significantly reduce energy consumption in steel production, compared to hot rolling and cold rolling. However, the quantitative dependences of the steel microstructure and mechanical properties on strip casting parameters are unknown and require investigation. In the present work we studied the effects of strain and interrupted cooling temperature on microstructure and mechanical properties in conventional dual phase steel (0.08C-0.81Si-1.47Mn-0.03Al wt%). The strip casting process was simulated using a Gleeble 3500 thermo-mechanical simulator. The steel microstructures were studied using optical, scanning and transmission electron microscopy. Mechanical properties were measured …

Effect Of Grain Size On Springback And System Energy In Micro V-Bending With Phosphor Bronze Foil, Zhi Fang, Zhengyi Jiang, Xiaogang Wang, Cunlong Zhou, Xianming Zhao, Xiaoming Zhang, Di Wu

Faculty of Engineering and Information Sciences - Papers: Part A

In this paper, the effect of grain size on springback in the micro V-bending process of phosphor bronze foil (face-centered cubic structure) is investigated. Grain size effect is expressed by the ratio of material thickness (T) to average grain size (D), and these T/D values are divided into three groups: larger than 1, less than 1, and approximately equal to 1. It has been found that springback angles were the lowest when T/D ≈ 1. Electron backscattering diffraction (EBSD) measurement results show that the twinning boundaries change with the ratios of T/D before and after bending. When T/D > 1, the …

Effect Of Cyano Dipolar Groups On The Performance Of Lithium-Ion Battery Electrospun Polyimide Gel Electrolyte Membranes, A Maceiras, A Goren, Vitor Sencadas, Carlos M. Costa, J L. Vilas, Senentxu Lanceros-Méndez, L M. Leon

Faculty of Engineering and Information Sciences - Papers: Part A

Three polyimide membranes (polymer 0CN, copolymers 0CN/2CN (50/50) and polymer 2CN), with and without [Formula presented] dipolar groups, have been prepared by electrospinning and evaluated as lithium-ion battery separators. The prepared membranes show average fiber diameters between 0.5 and 1.09 μm and a degree of porosity of ~ 80%. The thermal stability, uptake, tortuosity and ionic conductivity values are influenced by the presence of the [Formula presented] dipolar groups in the polyimide polymer chain. The best battery performance in LFP/Li system is obtained for the 0CN sample, which shows discharge capacity values of 149.7 mAh·g− 1, 146.5 mAh·g− 1 and …

Experimental And Numerical Study On The Effect Of Zddp Films On Sticking During Hot Rolling Of Ferritic Stainless Steel Strip, Liang Hao, Zhengyi Jiang, Dongbin Wei, Dianyao Gong, Xiawei Cheng, Jingwei Zhao, Suzhen Luo, Laizhu Jiang

Faculty of Engineering and Information Sciences - Papers: Part A

The aim of this study is to investigate the effect of zinc dialkyl dithio phosphate (ZDDP) films on sticking during hot rolling of a ferritic stainless steel strip. The surface characterization and crack propagation of the oxide scale are very important for understanding the mechanism of the sticking. The high-temperature oxidation of one typical ferritic stainless was conducted at 1373 K (1100 °C) for understanding its microstructure and surface morphology. Hot-rolling tests of a ferritic stainless steel strip show that no obvious cracks among the oxide scale were observed with the application of ZDDP. A finite element method model was …

Effect Of Mineral Matter On The Reactivity Of Coke And Its Replication In A Coke Analogue, Raymond Longbottom, Brian J. Monaghan, Azrin A. Chowdhury, Mark H. Reid, Guangqing Zhang, Merrick R. Mahoney, Kim Hockings

Faculty of Engineering and Information Sciences - Papers: Part A

The reactivity of coke analogues doped with minerals to mimic the mineralogy of specific industrial cokes was compared with the reactivity of the industrial cokes. The reactivity was assessed in a pseudo-CRI type test. This involved reacting the carbonaceous materials (analogue and industrial coke) in CO2 at 1 100°C in a thermos-gravimetric system. In this comparison, the mineral matter added to the coke analogue was prepared from ashing of the industrial cokes. A distinct ranking of reactivity for the industrial cokes was determined to be coke A < coke B < coke C. The high reactivity of coke C was attributed to the high iron content in its ash. The higher reactivity of coke B over coke A was attributed to its higher porosity and lower rank (of the original coal carbon type) of the industrial cokes. The coke analogue replicated the increased reactivity of coke C over cokes A and B, indicating that the coke analogue is able to some extent to replicate the effect of coke mineralogy on coke reactivity in CO2. The use of the coke analogue allowed assessment of the difference in the reactivities of cokes A and B. When porosity and carbon type were fixed by use of the analogue, the reactivities of the analogues of cokes A and B were found to be similar.

Sequential Processing And The Matching-Stimulus Interval Effect In Erp Components: An Exploration Of The Mechanism Using Multiple Regression, Genevieve Z. Steiner, Robert J. Barry, Craig J. Gonsalvez

Faculty of Social Sciences - Papers (Archive)

In oddball tasks, increasing the time between stimuli within a particular condition (target-to-target interval, TTI; nontarget-to-nontarget interval, NNI) systematically enhances N1, P2, and P300 event-related potential (ERP) component amplitudes. This study examined the mechanism underpinning these effects in ERP components recorded from 28 adults who completed a conventional three-tone oddball task. Bivariate correlations, partial correlations and multiple regression explored component changes due to preceding ERP component amplitudes and intervals found within the stimulus series, rather than constraining the task with experimentally constructed intervals, which has been adequately explored in prior studies. Multiple regression showed that for targets, N1 and TTI …

The Effect Of Respiratory Induced Density Variations On Non-Tof Pet Quantitation In The Lung, Beverley F. Holman, Vesna Cuplov, Brian F. Hutton, Ashley M. Groves, Kris Thielemans

Faculty of Engineering and Information Sciences - Papers: Part A

Accurate PET quantitation requires a matched attenuation map. Obtaining matched CT attenuation maps in the thorax is difficult due to the respiratory cycle which causes both motion and density changes. Unlike with motion, little attention has been given to the effects of density changes in the lung on PET quantitation. This work aims to explore the extent of the errors caused by pulmonary density attenuation map mismatch on dynamic and static parameter estimates. Dynamic XCAT phantoms were utilised using clinically relevant 18F-FDG and 18F-FMISO time activity curves for all organs within the thorax to estimate the expected parameter errors. The …

Coupled Grain Boundary Motion In Aluminium: The Effect Of Structural Multiplicity, Kuiyu Cheng, Liang Zhang, Cheng Lu, Anh Kiet Tieu

Faculty of Engineering and Information Sciences - Papers: Part A

The shear-induced coupled grain boundary motion plays an important role in the deformation of nanocrystalline (NC) materials. It has been known that the atomic structure of the grain boundary (GB) is not necessarily unique for a given set of misorientation and inclination of the boundary plane. However, the effect of the structural multiplicity of the GB on its coupled motion has not been reported. In the present study we investigated the structural multiplicity of the symmetric tilt Σ 5(310) boundary in aluminium and its influence on the GB behaviour at a temperature range of 300 K-600 K using molecular dynamic …

The Effect Of Binary And Ternary Mineral Combinations On The Reactivity Of A Coke Analogue, Raymond Longbottom, Brian J. Monaghan, Guangqing Zhang, Azrin A. Chowdhury, Merrick R. Mahoney, Kim Hockings, Mark H. Reid

Faculty of Engineering and Information Sciences - Papers: Part B

The effect of the mineral matter on the reactivity of a coke analogue was examined through the addition of binary and ternary combinations of magnetite (Fe3O4), troilite (FeS) and quartz (SiO2). The use of coke at a laboratory scale has issues arising from it heterogeneity and complex nature. The coke analogue was developed to help alleviate these issues, being a laboratory tool that has a simplified carbon structure and in which the mineral content, particle size and distribution is largely controlled. The reactivity of the coke analogue with CO2 was measured using a TGA system at 1100°C under conditions similar …

The Effect Of Urban Form On Wellbeing, Thomas E. Astell-Burt, Xiaoqi Feng

Faculty of Social Sciences - Papers (Archive)

The purpose of this Evidence Check was to conduct a rapid review of existing evidence on the impact of the built environment on mental health and psychological wellbeing (hereafter referred to collectively as wellbeing). A total of 103 studies were reviewe d after a systematic search of the literature. Most studies used the Center for Epidemiologic Studies Depression scale, the General Health Questionnaire, or the Kessler scales to measure wellbeing.

Risk Assessment Of Exposure To Needle-Stick Injuries By Healthcare Failure Mode And Effect Analysis Method In A Large Hospital, R Yarahmadi, Mehdi Aligol, Meysam Eyvazlou, Shahnaz Bakand

Faculty of Social Sciences - Papers (Archive)

Article in Persian Background and Objectives: Healthcare workers (HCWs) are one of the most important jobs in exposure to Needle Stick (NS) and, therefore, are in risk of infection to diseases such as Hepatitis B (HB) and AIDS. The aim of this study was to identify and assess risk of injuries caused by needle and sharps in healthcare personnel of a hospital in Tehran. Methods: In this study, hazard analysis method of Healthcare Failure Mode and Effect Analysis (HFMEA) was selected. After several meetings with related experts, by the help of a provided checklist, hazardous processes related to NS injuries …

Improved Correction For The Tissue Fraction Effect In Lung Pet/Ct Imaging, Beverley F. Holman, Vesna Cuplov, Lynn Millner, Brian F. Hutton, Toby M. Maher, Ashley M. Groves, Kris Thielemans

Faculty of Engineering and Information Sciences - Papers: Part A

Recently, there has been an increased interest in imaging different pulmonary disorders using PET techniques. Previous work has shown, for static PET/CT, that air content in the lung influences reconstructed image values and that it is vital to correct for this 'tissue fraction effect' (TFE). In this paper, we extend this work to include the blood component and also investigate the TFE in dynamic imaging. CT imaging and PET kinetic modelling are used to determine fractional air and blood voxel volumes in six patients with idiopathic pulmonary fibrosis. These values are used to illustrate best and worst case scenarios when …

Effect Of Temperature On Microstructure And Deformation Mechanism Of Fe-30mn-3si-4al Twip Steel At Strain Rate Of 700 S-1, Zhiping Xiong, Xue-Ping Ren, Jian Shu, Zhe-Lei Wang, Wei-Ping Bao, Shu-Xia Li

Faculty of Engineering and Information Sciences - Papers: Part A

As twinning-induced plasticity (TWIP) steel is one potential material for shaped charge liner due to the combination of high strength and high plasticity, deformation mechanism at high strain rate and high temperature is required to study. Compression experiments of Fe-30Mn-3Si-4Al TWIP steel were conducted using a Gleeble-1500 thermal simulation machine and a split-Hopkinson pressure bar (SHPB) between 298 and 1073 K at strain rates of 10-3 and 700 s-1, respectively. Microstructures were observed using optical microscopy (OM) and transmission electron microscopy (TEM). Results show that flow stress and densities of deformation twins and dislocations decrease with increasing deformation temperature at …

Grain Size Effect Of Thickness/Average Grain Size On Mechanical Behaviour, Fracture Mechanism And Constitutive Model For Phosphor Bronze Foil, Zhi Fang, Zhengyi Jiang, Xiaogang Wang, Cunlong Zhou, Dongbin Wei, Xianghua Liu

Faculty of Engineering and Information Sciences - Papers: Part A

Size effects play a significant role in microforming process, and any dimensional change can have a great impact on materials' mechanical properties. In this paper, the size effects on deformation behaviour and fracture of phosphor foil were investigated in the form of grain size effect: the ratio of materials' thickness (T) to average grain size (D) by micro tensile tests. The ratio was designed to be closed to but larger than, less than and equal to 1, respectively. The results show that the amount of plastic deformation decreases with the decrease of the ratio of T/D, which indicates that the …

The Bulk-Edge Correspondence For The Quantum Hall Effect In Kasparov Theory, Christopher J. Bourne, Alan L. Carey, Adam C. Rennie

Faculty of Engineering and Information Sciences - Papers: Part A

We prove the bulk-edge correspondence in K-theory for the quantum Hall effect by constructing an unbounded Kasparov module from a short exact sequence that links the bulk and boundary algebras. This approach allows us to represent bulk topological invariants explicitly as a Kasparov product of boundary invariants with the extension class linking the algebras. This paper focuses on the example of the discrete integer quantum Hall effect, though our general method potentially has much wider applications.

Effect Of Extreme Pressure Additives On The Deformation Behavior Of Oxide Scale During The Hot Rolling Of Ferritic Stainless Steel Strips, Liang Hao, Zhengyi Jiang, Xiawei Cheng, Jingwei Zhao, Dongbin Wei, Laizhu Jiang, Suzhen Luo, Ming Luo, Li Ma

Faculty of Engineering and Information Sciences - Papers: Part A

High-speed steel (HSS) materials are universally used as work rolls for the hot rolling of stainless steels. Their use has increased the output of the rolling mill and decreased roll material consumption and grinding. Sticking defects often occur, however, during the hot rolling process. In this article, extreme pressure (EP) additives were dropped on the HSS samples at high temperature. Zinc dialkyl dithiophosphate (ZDDP) was chosen as the most effective EP additive by scratch tests on the HSS samples. In order to determine the optimum proportion of ZDDP in the lubricant, two reduction rates were tested on a Hille 100 …