High Definition Metrology-Based Quality Improvement of Surface Texture in Face Milling of Workpieces with Discontinuous Surfaces

2021 ◽  
pp. 1-38
Author(s):  
Guilong Li ◽  
Shichang Du ◽  
Bo Wang ◽  
Jun Lv ◽  
Yafei Deng
Keyword(s):  
Quality Improvement ◽  
Surface Texture ◽  
Mechanical Performance ◽  
Processing Parameters ◽  
Milling Process ◽  
Face Milling ◽  
Measurement Instruments ◽  
High Definition ◽  
Tool Marks

Abstract In face milling process, the quality of surface texture is vital for mechanical performance of workpieces. The quality of surface texture, especially for waviness, is directly affected by tool marks, a commonly observed phenomenon in face milling. However, appropriate approaches for evaluation and modeling of tool marks are absent to date. Limited to the resolution as well as the efficiency of conventional measurement instruments, the height data of tool marks is hard to be entirely obtained, leading to valuable information omission. Besides, most existing models of tool marks are established for general workpieces with regular geometry and continuous surfaces. Since the cutter-workpiece engagement mode has a significant impact on the generation of tool marks, current models could be inaccurate or invalid when dealing with workpieces with discontinuous surfaces. To overcome this shortage, a novel approach is proposed in this paper, aimed at quality improvement of surface texture in face milling of workpieces with discontinuous surfaces. Firstly, the evaluation indexes for tool marks are defined based on the recently developed high definition metrology (HDM). Secondly, the physical modeling of tool marks is presented, taking the face milling mechanism into account. Thirdly, the physical-informed optimization model is developed to search for the optimal processing parameters for surface quality improvement. At last, the effectiveness of the proposed approach is verified by a face milling experiment on the engine blocks.

scholarly journals Methods of comparison of surface texture based on fractal dimension and Hotelling’s T2 test

2019 ◽  
Vol 19 (4) ◽  
pp. 82-90
Author(s):  
Damian GOGOLEWSKI
Keyword(s):  
Fractal Dimension ◽  
Surface Texture ◽  
Statistical Tests ◽  
Milling Process ◽  
Face Milling ◽  
Machining Parameters ◽  
Hotelling's T2 ◽  
Hotelling’S T2 ◽  
Machine Parts ◽  
Hotelling’S T2 Test

Comparative analysis of the surface texture of machine parts can be successfully carried out using statistical tests. The paper presents a methodology of method used to compare the surface texture by applying Hotelling’s T2 test as well as a method used to evaluate surface topography by applying fractal dimension. The tests were carried out on samples produced with the use of face milling process for four types of materials. The following types of steel were used: 40HM, C45, NC6 and WCL. For each type of material, four areas were machined with the same machining parameters. Based on these results a decision was made whether the surfaces, despite the same machining conditions, were significantly different from each other. Furthermore, the analysis indicated that the fractal dimension enabled to characterise signal irregularities in quantitative and qualitative way.

SEKOLAH GRATIS DAN MUTU SEKOLAH: STUDI KASUS DI SMAN 2 BABAT TOMAN MUSI BANYUASIN SUMSEL

2015 ◽  
Vol 8 (1) ◽  
pp. 1
Author(s):  
Afriantoni Afriantoni ◽  
Ibrahim Ibrahim
Keyword(s):  
Quality Improvement ◽  
Qualitative Method ◽  
School Quality ◽  
School Policy ◽  
School Education ◽  
Education Quality ◽  
Free School ◽  
School Costs

This study aimed to describe in depth between the link of school policy and the school quality improvement. The method in this study is a qualitative method using the case study presented descriptively. This research was conducted at SMA Negeri 2 Babat Tomat Kabupaten Musi Banyuasin. Based on this study it was found that the First, free school policy can help the economy / ease the burden of school costs to be incurred by the parents. Second, the policy constraints of the application for free school educa-tion at SMAN 2 Babat Toman is not very effective, so that the students' interest is not increasing, infrastructure is one of the obstacles in the implementation of free school education, how the quality of schools will be increased if it is not supported by facilities and complete infrastructure. Third, the quality of school education free SMAN 2 Babat Toman already realized well with regard to input, input turns unselected maximum, that is the students. Fourth, the implementation of free school education in Banyuasin, the quality of school SMAN 2 Babat Toman Muba Sumsel was not increased. This means that the implementation for free school education quality of school SMAN 2 Babat Toman was not increased.Keywords : free schools, school quality, case studies

Edukasi dan Peningkatan Kualitas Pengelolaan Obat di Rumah Tangga: Studi Kasus di Dusun Sidasari Wetan Desa Kubangkangkung Kawunganten Cilacap (Education and Quality Improvement of Drug Management in Family: A Case Study at Dusun Sidasari Wetan, Kubang

2018 ◽  
Vol 2 (2) ◽  
pp. 93
Author(s):  
Hendri Wasito ◽  
Hening Pratiwi ◽  
Adi Wibowo ◽  
Nia Kurnia Solihat
Keyword(s):  
Quality Improvement ◽  
Home Visit ◽  
Behavioral Changes ◽  
Drug Management ◽  
Educational Effort ◽  
The Family ◽  
Service Activity ◽  
Knowledge And Attitude

Drugs are an important component of health services that are the needs of the community. There is still a lack ofcommunity knowledge of medicines and management especially for family members, hence an educational effort as well asimprovement of quality of drug management in family through training program and mentoring by pharmacist. Thiscommunity service activity aims to determine the knowledge and attitude of the community in managing drugs in the familyand improve the quality of drug management by the community in the family. The activity was conducted in SidasariWetanKubangkangkung Village Kawunganten Cilacap. The workshop on drug management in family was conducted by pharmaciststo the 33 participants. Data collection was done by using questionnaire and observation through home visit. The result of theactivity shows that the increase of knowledge and attitude of the society in managing drugs in the familywere 10% and 7%,respectively. Workshop activities and mentoring by pharmacists can provide benefits and behavioral changes in family drugsmanagement.

scholarly journals Smoothing additive manufactured parts using ns-pulsed laser radiation

2021 ◽  
Author(s):  
Florian Kuisat ◽  
Fernando Lasagni ◽  
Andrés Fabián Lasagni
Keyword(s):  
Surface Roughness ◽  
Mechanical Performance ◽  
State Of The Art ◽  
Pulsed Laser ◽  
Industrial Applications ◽  
Laser Source ◽  
Pulsed Laser Radiation ◽  
Current State ◽  
The Impact

AbstractIt is well known that the surface topography of a part can affect its mechanical performance, which is typical in additive manufacturing. In this context, we report about the surface modification of additive manufactured components made of Titanium 64 (Ti64) and Scalmalloy®, using a pulsed laser, with the aim of reducing their surface roughness. In our experiments, a nanosecond-pulsed infrared laser source with variable pulse durations between 8 and 200 ns was applied. The impact of varying a large number of parameters on the surface quality of the smoothed areas was investigated. The results demonstrated a reduction of surface roughness Sa by more than 80% for Titanium 64 and by 65% for Scalmalloy® samples. This allows to extend the applicability of additive manufactured components beyond the current state of the art and break new ground for the application in various industrial applications such as in aerospace.

scholarly journals Implementation of the Multidisciplinary Guideline on Chronic Pain in Vulnerable Nursing Home Residents to Improve Recognition and Treatment: A Qualitative Process Evaluation

Healthcare ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 905
Author(s):  
Lizanne E. van den Akker ◽  
Margot W. M. de Waal ◽  
Paul J. E. M. Geels ◽  
Else Poot ◽  
Wilco P. Achterberg
Keyword(s):  
Chronic Pain ◽  
Nursing Home ◽  
Guideline Implementation ◽  
Nursing Home Residents ◽  
Implementation Process ◽  
Measurement Instruments ◽  
Policy Document ◽  
Multidisciplinary Meetings ◽  
Qualitative Process Evaluation

The recognition and treatment of pain in nursing home residents presents challenges best addressed by a multidisciplinary approach. This approach is also recommended in the applicable Dutch guideline; however, translating guidelines into practical strategies is often difficult in nursing homes. Nevertheless, a better understanding of guideline implementation is key to improving the quality of care. Here we describe and qualitatively evaluate the implementation process of the multidisciplinary guideline ‘Recognition and treatment of chronic pain in vulnerable elderly’ in a Dutch nursing home. The researchers used interviews and document analyses to study the nursing home’s implementation of the guideline. The project team of the nursing home first filled out an implementation matrix to formulate goals based on preferred knowledge, attitudes, and behaviors for the defined target groups. Together with experts and organizations, pharmacotherapy audit meetings were organized, an expert pain team was appointed, a policy document and policy flowchart were prepared, and ‘anchor personnel’ were assigned to disseminate knowledge amongst professionals. Implementation was partially successful and resulted in a functioning pain team, a pain policy, the selection of preferred measurement instruments, and pain becoming a fixed topic during multidisciplinary meetings. Nevertheless, relatively few professionals were aware of the implementation process.

scholarly journals Engaging community pharmacists in quality improvement (QI): a qualitative case study of a partnership between a Higher Education Institute and Local Pharmaceutical Committees

2021 ◽  
Vol 10 (1) ◽  
pp. e001047
Author(s):  
Asam Latif ◽  
Nargis Gulzar ◽  
Fiona Lowe ◽  
Theo Ansong ◽  
Sejal Gohil
Keyword(s):  
Quality Improvement ◽  
Focus Groups ◽  
Qualitative Methodology ◽  
Positive Impact ◽  
Community Pharmacists ◽  
Educational Institute ◽  
Collaboration And Communication ◽  
Improve Service Quality ◽  
The Impact

BackgroundQuality improvement (QI) involves the use of systematic tools and methods to improve the quality of care and outcomes for patients. However, awareness and application of QI among healthcare professionals is poor and new strategies are needed to engage them in this area.ObjectivesThis study describes an innovative collaboration between one Higher Educational Institute (HEI) and Local Pharmaceutical Committees (LPCs) to develop a postgraduate QI module aimed to upskill community pharmacists in QI methods. The study explores pharmacist engagement with the learning and investigates the impact on their practice.MethodsDetails of the HEI–LPCs collaboration and communication with pharmacist were recorded. Focus groups were held with community pharmacists who enrolled onto the module to explore their motivation for undertaking the learning, how their knowledge of QI had changed and how they applied this learning in practice. A constructivist qualitative methodology was used to analyse the data.ResultsThe study found that a HEI–LPC partnership was feasible in developing and delivering the QI module. Fifteen pharmacists enrolled and following its completion, eight took part in one of two focus groups. Pharmacists reported a desire to extend and acquire new skills. The HEI–LPC partnership signalled a vote of confidence that gave pharmacists reassurance to sign up for the training. Some found returning to academia challenging and reported a lack of time and organisational support. Despite this, pharmacists demonstrated an enhanced understanding of QI, were more analytical in their day-to-day problem-solving and viewed the learning as having a positive impact on their team’s organisational culture with potential to improve service quality for patients.ConclusionsWith the increased adoption of new pharmacist’s roles and recent changes to governance associated with the COVID-19 pandemic, a HEI–LPC collaborative approach could upskill pharmacists and help them acquire skills to accommodate new working practices.

scholarly journals Long-fibre reinforced polymer composites by 3D printing: influence of nature of reinforcement and processing parameters on mechanical performance

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Francis Dantas ◽  
Kevin Couling ◽  
Gregory J. Gibbons
Keyword(s):  
Carbon Fibre ◽  
Polymer Composites ◽  
Mechanical Performance ◽  
Flexural Modulus ◽  
Matrix Material ◽  
Processing Parameters ◽  
Fibre Reinforcement ◽  
Reinforced Polymer ◽  
Unreinforced Material ◽  
Fibre Reinforced Polymer

Abstract The aim of this study was to identify the effect of material type (matrix and reinforcement) and process parameters, on the mechanical properties of 3D Printed long-fibre reinforced polymer composites manufactured using a commercial 3D Printer (Mark Two). The effect of matrix material (Onyx or polyamide), reinforcement type (Carbon, Kevlar®, and HSHT glass), volume of reinforcement, and reinforcement lay-up orientation on both Ultimate Tensile Strength (UTS) and Flexural Modulus were investigated. For Onyx, carbon fibre reinforcement offered the largest increase in both UTS and Flexural Modulus over unreinforced material (1228 ± 19% and 1114 ± 6% respectively). Kevlar® and HSHT also provided improvements but these were less significant. Similarly, for Nylon, the UTS and Flexural Modulus were increased by 1431 ± 56% and 1924 ± 5% by the addition of carbon fibre reinforcement. Statistical analysis indicated that changing the number of layers of reinforcement had the largest impact on both UTS and Flexural Strength, and all parameters were statistically significant.

scholarly journals Optimisation of Shrinkage and Strength on Thick Plate Part Using Recycled LDPE Materials

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1795
Author(s):  
Norshahira Roslan ◽  
Shayfull Zamree Abd Rahim ◽  
Abdellah El-hadj Abdellah ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Katarzyna Błoch ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Thick Plate ◽  
Processing Parameters ◽  
Processing Parameter ◽  
Plastic Injection Moulding ◽  
Optimal Setting ◽  
Quality Of Products ◽  
Validation Tests ◽  
Plastic Injection

Achieving good quality of products from plastic injection moulding processes is very challenging, since the process comprises many affecting parameters. Common defects such as warpage are hard to avoid, and the defective parts will eventually go to waste, leading to unnecessary costs to the manufacturer. The use of recycled material from postindustrial waste has been studied by a few researchers. However, the application of an optimisation method by which to optimise processing parameters to mould parts using recycled materials remains lacking. In this study, Response Surface Methodology (RSM) and Particle Swarm Optimisation (PSO) methods were conducted on thick plate parts moulded using virgin and recycled low-density polyethylene (LDPE) materials (100:0, 70:30, 60:40 and 50:50; virgin to recycle material ratios) to find the optimal input parameters for each of the material ratios. Shrinkage in the x and y directions increased in correlation with the recycled ratio, compared to virgin material. Meanwhile, the tensile strength of the thick plate part continued to decrease when the recycled ratio increased. R30 (70:30) had the optimum shrinkage in the x direction with respect to R0 (100:0) material where the shrinkage increased by 24.49% (RSM) and 33.20% (PSO). On the other hand, the shrinkage in the y direction for R30 material increased by 4.48% (RSM) and decreased by 2.67% (PSO), while the tensile strength of R30 (70:30) material decreased by 0.51% (RSM) and 2.68% (PSO) as compared to R0 (100:0) material. Validation tests indicated that the optimal setting of processing parameter suggested by PSO and RSM for R0 (100:0), R30 (70:30), R40 (60:40) and R50 (50:50) was less than 10%.

scholarly journals Measuring perceived adequacy of staffing to incorporate nurses’ judgement into hospital capacity management: a scoping review

BMJ Open ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. e045245
Author(s):  
Carmen J E M van der Mark ◽  
Hester Vermeulen ◽  
Paul H J Hendriks ◽  
Catharina J van Oostveen
Keyword(s):  
Psychometric Properties ◽  
Scoping Review ◽  
Care Delivery ◽  
Hospital Setting ◽  
Workforce Planning ◽  
Nurse Staffing ◽  
Measurement Instruments ◽  
Health Measurement ◽  
Factors Influencing

BackgroundMatching demand and supply in nursing work continues to generate debate. Current approaches focus on objective measures, such as nurses per occupied bed or patient classification. However, staff numbers do not tell the whole staffing story. The subjective measure of nurses’ perceived adequacy of staffing (PAS) has the potential to enhance nurse staffing methods in a way that goes beyond traditional workload measurement or workforce planning methods.ObjectivesTo detect outcomes associated with nurses’ PAS and the factors that influence PAS and to review the psychometric properties of instruments used to measure PAS in a hospital setting.Design and methodsA scoping review was performed to identify outcomes associated with PAS, factors influencing PAS and instruments measuring PAS. A search of PubMed, Cumulative Index to Nursing and Allied Health Literature (CINAHL), Business Source Complete and Embase databases identified 2609 potentially relevant articles. Data were independently extracted, analysed and synthesised. The quality of studies describing influencing factors or outcomes of PAS and psychometric properties of instruments measuring PAS were assessed following the National Institute for Health and Care Excellence quality appraisal checklist and the COnsensus-based Standards for the selection of health Measurement INstruments guidelines.ResultsSixty-three studies were included, describing 60 outcomes of PAS, 79 factors influencing PAS and 21 instruments measuring PAS. In general, positive PAS was related to positive outcomes for the patient, nurse and organisation, supporting the relevance of PAS as a staffing measure. We identified a variety of factors that influence PAS, including demand for care, nurse supply and organisation of care delivery. Associations between these factors and PAS were inconsistent. The quality of studies investigating the development and evaluation of instruments measuring PAS was moderate.ConclusionsMeasuring the PAS may enhance nurse staffing methods in a hospital setting. Further work is needed to refine and psychometrically evaluate instruments for measuring PAS.

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