Form Error Research Articles

Expense Tracker

Expense Tracker A company expense tracker is developed using the React JavaScript library. The app allows employees to log and track their business expenses, including the cost, date, and details of each expense. The app's user interface was designed to be user-friendly, with clear input fields and an organized layout for displaying expenses entries. To build the app, the we use a variety of tools and technology including React components, the fetch function, and a backend service for storing and retrieving data. we also have to implement form validation and error handling to ensure the accuracy and completeness of the expense data. In addition to the core expense tracking functionality, we added several additional features, such as the ability to filter and sort expense entries and the option to generate reports of total expenses by category or date range. Overall, the expense tracker app is a useful tool for employees to manage their business expenses

Accuracy analysis for machine tool spindles considering full parallel connections and form errors based on skin model shapes

Abstract The rotation accuracy of a machine tool spindle is essential for ensuring the machining precision. Due to the existence of manufacturing and assembly errors, the rotation accuracy of the spindle will be inevitably impacted and degraded. Therefore, to reduce the influence of the errors and improve the work performance, this paper focuses on accuracy analysis for the spindle and a novel optimization-oriented skin model shape method to tackle this highly complex problem. First, a structural analysis of the spindle is carried out to elaborate the intractable full parallel collections in the assembly. Then, based on the iterative closest point method, the deviation propagation of the spindle considering complex full parallel collections is transformed into an optimization problem, in which the skin model shapes and small displacement torsor are utilized to represent the form and pose errors of the part, respectively. By solving the optimization problem, assembly accuracy analysis for the spindle in terms of full parallel connections and form errors is accordingly achieved. On this basis, the tolerance analysis model of the spindle is also comprehensively established by employing the corresponding error simulation. Finally, measurement experiments are conducted to validate the effectiveness of the proposed method. The experiments show the predicted rotation runout and tolerance magnitude are close to the testing results, therefore indicating the proposed method can provide effective accuracy analysis for spindles.

The Influence Factors of Incremental Forming Geometric Accuracy based on the Weighted Gray Correlation Analysis Method

In view of the process complexity of the pillow effect phenomenon, the orthogonal experiment was designed, and the numerical simulation of the single-point incremental forming process under various process parameters was carried out by using the finite element software. Taking the height of the specific position (i.e., bulging) of the pillow effect phenomenon as the evaluation index, the data were analyzed based on the weighted gray correlation analysis method. The influence of the forming height, sheet thickness, forming angle, layer feed, tool head diameter, and part size process parameters on the forming geometric accuracy was studied. The optimal process parameters of single-point incremental forming and the primary and secondary order of the influence on the evaluation index were obtained. The results show that the weighted gray correlation analysis can effectively reduce the geometric error of the pillow effect phenomenon form of the target part and improve the forming accuracy.

Analysis and compensation for the dominant tool error in ultra-precision diamond ball-end milling

Diamond ball-end milling is an enabling technology to fabricate complex curved surfaces with a nanometer level roughness. However, limited by the errors of tool manufacturing and installation, the cutting edge profile of a single-bladed diamond milling tool cannot form an ideal sphere crown in rotation, which will significantly worsen the machining accuracy. Although a titled milling method and a tool error reduction method based on milling-test have been proposed to improve the machining accuracy, a complete analysis of the effects of multiple tool errors on the machining accuracy have not been performed. Therefore, the present work contributes an analytical model to accurately calculate the tool rotation profile under various position and orientation errors. The results reveal that the horizontal off-center error of tool cutting edge is the dominant error among all the tool errors. According to the results, a novel high precision identification process is developed to evaluate the horizontal off-center error in view of the cutting-mark, and subsequently a tool center shift method is proposed to compensate for such error. Finally, experiments on millimeter scale spherical surface, micro sphere array and micro sinusoidal surface confirm that the proposed tool error compensation method can significantly improve the form accuracy. The average form errors (PV) of three test surfaces are reduced from 2.29 μm, 0.90 μm and 0.88 μm to 0.61 μm, 0.28 μm and 0.18 μm, respectively.

Ultra-precision grinding of light-weighted SiC aspheric mirror

Based on the approximate 3D model of light-weighted SiC aspheric mirror, the deformation and stress at different positions along the radius caused by the grinding force on the mirror surface was analysed. Then the influence of processing parameters on grinding force was experimentally studied, and the prediction model of grinding force was established. Finally, the grinding experiment of light-weighted SiC aspheric mirror was carried out. The PV value of the aspheric surface form error was 4.15μm, and the Ra of surface roughness was about 28nm. The experimental results verified the feasibility of ultra-precision forming of lightweight SiC mirror by controlling grinding force based on process parameters.

Ultra-precision grinding of monocrystalline silicon cylindrical mirror

As one of the important functional components in the optical diagnosis system, the processing accuracy of monocrystalline silicon cylindrical mirror directly affects the overall performance of the entire experimental device. In order to obtain high-precision monocrystalline silicon cylindrical optical elements, the coordinate transfer function models of the diamond wheel in the cylindrical surface parallel grinding process were established, and the forming process scheme was proposed based on the wheel dressing precision and element grinding precision. At the end, the experiment for a monocrystalline silicon cylindrical mirror with size of 440mm × 50mm was carried out. The PV value of form error after grinding was about 2.7μm, which proved the correctness of the transfer function and the forming process scheme of monocrystalline silicon cylindrical optical element.

과학영재 학생과 일반 고등학생의 과학 논문 특징 비교

Research is an effective way for high school students to develop critical thinking, creative problem-solving, and communication skills. However, students often need help writing papers and need systematic training in writing papers. For this purpose, it is necessary first to understand the characteristics of students’ papers. Therefore, this study analyzed the science papers written by science-gifted students in science high schools, gifted schools, and general high school students in science core schools by analyzing each step of the science paper structure to compare their features and errors. The analysis utilized a self-developed step-by-step checklist of science paper structure for 17 science papers of gifted students and 40 science papers for general high school students. The results of the study were as follows. First, both groups lacked structure and volume in the abstract and limitations of the study in the conclusion and suggestion section. The general high school students’ deficiencies included irrelevant theories in the theoretical background, inaccurate data visualization in the results and discussion, missing citations, and formal reference errors. Second, students’ errors in their science papers varied across the stages of the science paper structure. From the above results, both groups commonly offer paper writing education regarding the abstract, conclusion, and recommendation stages. In contrast, other stages of paper structure and research ethics education are more necessary for general high school students. We hope paper writing education related to scientific research activities will be systematized.

Oral medicine administration errors in a patient with an enteral feeding tube

Proper nutrition is vital for all patients with an expected lifespan. It is strongly recommended that patients whose oral intake is impaired or suspected to be impaired should be provided nutritional support. Concurrent medication administration during enteral nutrition may result in complications unless necessary precautions are taken. This study presents a case of a 94-year-old male patient with poor general health condition and being treated in a palliative care service. The patient was fed with an enteral feeding tube for seven drugs. There have been two tube occlusions causing the replacement of the tube since the enteral feeding tube was placed.The clinical pharmacist checked how the patient’s drugs were given through a nasogastric tube and how the patient’s relatives administered the drugs. Inappropriate dosage form selections and errors in administration through the nasogastric tube were identified. The interaction and incompatibility of the patient’s medications with the nutritional formula were also investigated. The clinical pharmacist informed the person giving the medicine to the patient about the correct administration of the medicine from the tube. The proper method for administering medications from the tube was ensured accordingly. Following the clinical pharmacist’s training, it was observed that the nasogastric tube was correctly used to administer the drug and the patient being monitored had no tube obstruction in the later phases of the treatment.It may be beneficial for a pharmacist to review drug dosage forms and applications in patients with a feeding tube in order to ensure correct administration and avoid undesired drug interactions.

Kesalahan Penerjemahan Bahasa Indonesia-Bahasa Arab (Studi Kasus Hasil Terjemahan Mahasiswa Prodi Pendidikan Bahasa Arab IAIDA Blokagung Banyuwangi)

The aim of this study is to identify and describe the errors in the translation of the Indonesian language into Arabic and the causes that occurred in the results of the translations of Indonesians-Arabic texts by students of the Arabic Language Education Institute of Islamic Religion Darussalam Blokagung Banyuwangi. This type of research is qualitative research. This research data is obtained from the translations of the students taken using analytical techniques. After the translation results are obtained, then the error identification, error classification and error reconstruction is carried out. The results of this research are, the forms of errors that occur in the students' translations are word selection errors, word deletion errors, word addition errors and word form errors. As for the cause of the error, there are two factors underlying the occurrence of the errors found, interlingual transfer and intralingual transfer.

A Comparison between EFL Writing Errors in Computer-Based and Paper-Based Assignments

Advances in writing technologies have fostered the gradual move from Paper-Based (PB) to Computer-Based (CB) writing assessment in foreign language (FL) education. The trend was further boosted by the outburst of the Covid-19 pandemic, which led to drastic changes in teaching and assessment practices. In higher education (HE) contexts, writing assessment in English as a foreign language (EFL) is more and more often managed by means of online learning platforms, where students create and submit written assignments on the computer. This paper examines a sample of 100 EFL exam essays completed by 100 Italian university students. Half of the essays were computer-typed on Moodle from home during the Covid-19 lockdown, whereas the other half were handwritten on paper during a face-to-face exam session after the Covid-19 emergency. The study presented herein compares the amount and types of formal errors in the CB and PB written assignments respectively. The results of the comparison may be useful to suggest hypotheses on the impact that both writing modality and environment can have on the quality of EFL writing in assessment contexts.

On the reduction in accuracy of finite difference schemes on manifolds without boundary

Abstract We investigate error bounds for numerical solutions of divergence structure linear elliptic partial differential equations (PDEs) on compact manifolds without boundary. Our focus is on a class of monotone finite difference approximations, which provide a strong form of stability that guarantees the existence of a bounded solution. In many settings including the Dirichlet problem, it is easy to show that the resulting solution error is proportional to the formal consistency error of the scheme. We make the surprising observation that this need not be true for PDEs posed on compact manifolds without boundary. We propose a particular class of approximation schemes built around an underlying monotone scheme with consistency error $O(h^{\alpha })$. By carefully constructing barrier functions, we prove that the solution error is bounded by $O(h^{\alpha /(d+1)})$ in dimension $d$. We also provide a specific example where this predicted convergence rate is observed numerically. Using these error bounds, we further design a family of provably convergent approximations to the solution gradient.

An Analysis of Students’ Grammatical Errors in Writing Narrative Texts

Senior high school students still make a large number of errors related to grammar when they have writing narrative text. This study aimed to analyze the types of grammatical errors, identifying the sources of errors, and knowing the writing difficulties commonly faced by the tenth grade students of senior high school in their narrative texts. Descriptive qualitative method was used in this study. There were two kinds of data being used namely quantitative data and qualitative data. There were three different instruments applied such as, the teacher, writing test, and questionnaires. There were only 23 narrative texts collected and analyzed. Based on the error analysis, there were 308 grammatical errors classified into four types, namely ‘omission’, ‘misformation’, ‘addition’, and ‘misordering errors’ in students’ narrative texts. ‘Misformation errors’ are the biggest number of errors there were 131, the most dominant errors are ‘misformation of alternating form errors’. The errors occured because of the students’ interlingual and intralingual transfer. There were cognitive problem that made the students feel difficult in writing narrative texts because of their lack of knowledge of English grammar and vocabularies.

High-frequency ultrasonic vibration-assisted sculpturing with a smoothed tool path for optical 3D micro-structured surfaces with sharp edges

The fabrication of complex 3D micro-structured surfaces on difficult-to-machine materials such as steel and tungsten carbide is the premise for mass production of glass components with functional surfaces by the glass moulding process. Ultrasonic vibration-assisted cutting (UVAC) is an effective method to machine 3D micro-structured surfaces on these difficult-to-machine materials. However, it is challenging and difficult for UVAC to machine microlens arrays with sharp edges, at which sudden acceleration of the z-axis slide is required to make the cutting tool follow the tool path. This could induce tool vibration and cause relative tool-work displacement, resulting in poor machining accuracy and surface finish of the machined 3D microstructure. In this paper, high-frequency ultrasonic vibration-assisted sculpturing (HFUVAS) with a smoothed tool trajectory is used to machine microlens array on steel mould for fine machining accuracy and surface quality. A comparison is made between the cutting performance of the circular microlens arrays machined by diamond turning and diamond sculpturing. The results found that relative tool-work displacement arising at sharp edge in diamond turning could be eliminated in HFUVAS with a smoothed tool path, demonstrating the effectiveness of a smoothed tool path in reducing relative tool-workpiece displacement in the fabrication of 3D micro-structured surfaces. Furthermore, a quadrilateral microlens array and hexagonal microlens array are also fabricated in order to extend the applications of HFUVAS, with a form error within 1 μm and surface roughness with an arithmetical mean height Sa of below 10 nm achieved.

Normal-Stressed Electromagnetic Triaxial Fast Tool Servo for Microcutting

Short strokes and complicated structures commonly degrade the operating performance of current piezo-actuated triaxial fast tool servos (FTSs). To overcome those deficiencies, we present a novel normal-stressed electromagnetic triaxial FTS for micro-cutting, which achieves a compact structure and a high resonant frequency with triaxial motions in hundreds of micrometers. The magnetic FTS has a single armature to provide the triaxial decoupled and non-contact driving forces, as well as a symmetric 3-DOF corrugated compliant bearing to support and guide the decoupled outputs. With the parameters jointly optimized by an analytical and finite element model, the prototype showed a high degree of agreement with the design target for both static and dynamic performances. A linear active disturbance rejection control is implemented for the triaxial FTS, and an iterative learning scheme is further employed for the triaxial FTS to achieve fast and accurate trajectory tracking. The developed triaxial FTS is comprehensively demonstrated by fabricating a hexagonal spherical micro-lens array with each lenslet generated within 0.24&#x00A0;s. The practical error for the spatial trajectory tracking was within <inline-formula><tex-math notation="LaTeX">$ \pm$</tex-math></inline-formula>30&#x00A0;nm, and good surface quality with a form error of 63.66&#x00A0;nm and surface roughness of <i>Sa</i>=2.05&#x00A0;nm is achieved.

Grammarly and Grammatical Errors Reduction: A Case for Non-Native English Teachers’ Professional Learning

Grammar has long been a source of aggravation for anyone learning a second language, not just English language learners, but also non-native English teachers. People can now employ Grammarly to correct their grammar mistakes, owing to the sophistication of modern technology. The debate over whether teachers use Grammarly as part of their professional development is ongoing. The purpose of this study was to identify the grammatical errors made by non-native English teachers when writing narrative texts before and after Grammarly checked them. The participants in this qualitative study were 24 English teachers from the English Teacher Association of Buleleng Regency in Bali, Indonesia. This study employed the surface approach taxonomy to analyze the grammatical errors and interviewed the teachers to elicit factors that contribute to grammatical errors. This study found that the most common type of misformation error, specifically the alternating form error, was found in both Grammarly-corrected and Grammarly-uncorrected texts. Furthermore, intralingual factors were responsible for the majority of errors. The integration of Grammarly into teachers' professional learning is discussed.

A novel calibration method for angular misalignment in independently controlled fast tool servo-based diamond turning

With significant technological progress in optics fields, such as VR and 3D sensing technologies, the demand for optical components with complex shapes (e.g., freeform surfaces) has expanded significantly in recent years. Ultra-precision diamond turning is one of the common manufacturing methods used for freeform optics. There are two tool-motion mechanisms for freeform diamond turning: slow tool servo (STS), which moves the entire tool rest, and fast tool servo (FTS), which only drives the diamond tool. In particular, high-frequency and long-stroke FTS units driven by a separate control system from the machine tool controller have recently been developed as a new trend in FTS-based diamond turning. However, this type of independent FTS control system causes a time delay between the machine tool instruction and the FTS tool motion. Even a millisecond-scale time delay can cause a considerable angular misalignment owing to the high rotation rate of the spindle, resulting in a micron-scale form error on the workpiece surface. In this paper, a novel method for precisely measuring the time delay from the machined workpiece surface and compensating for the misalignment based on the measured time delay was proposed. To measure the time delay, spherical dimples were machined on the workpiece surface by using STS and FTS. Subsequently, the angular misalignment and time delay were obtained by comparing the measured surface profiles at specific positions of the spherical dimples. Thus, the time delay can be measured with microsecond-scale accuracy. Based on the measured time delay, the shifted tool position along the spindle axis by the time delay was compensated to the ideal tool position by considering the cutting velocity. Consequently, the angular misalignment was completely eliminated, and submicron-level form accuracy was achieved. This calibration method of angular misalignment for an independent FTS unit is expected to significantly improve the accuracy of ultra-precision machining of freeform optics.

ANALISIS KESALAHAN PENULISAN SOKUON DAN YO’ON PADA ANGGOTA KLUB BAHASA JEPANG MAN 2 KOTA MALANG

The purpose of this research is to describe the errors in writing yo'on and sokuon in noun vocabulary made by Japanese language club members of MAN 2 Malang City. The method used in this research is a descriptive qualitative research method and the data analysed are the test results. The data analysis in this study was classified using Tarigan's theory of errors according to the perspective of surface tactics. This research was conducted against the background of several errors found in the writing of vocabulary in hiragana letters by students. This study focused on examining errors in the forms of yo'on and sokuon in noun vocabulary. Based on the test results that have been analysed, yo'on form errors are more common than sokuon form errors. Out of 5 vocabularies of yo'on form, in all vocabularies, there are some students who make mistakes in each vocabulary item. While from 5 vocabularies of sokuon form, students only made mistakes in 2 vocabularies, the other 3 vocabularies all students answered correctly. Then the type of error that is often made by students is the type of wrong formation error. From the results that have been analysed, there are 14 forms of wrong formation errors (misformation), while there are only 2 forms of omission errors (omission) and 1 form of addition error (addition).

Control of Tooth Form Deformation in Heat Treatment of Spiral Bevel Gears Based on Reverse Adjustment of Cutting Parameters.

The tooth surface structure of spiral bevel gear is complex and requires high machining accuracy. In order to reduce the tooth form deformation of heat treatment, this paper proposes a reverse adjustment correction model of tooth cutting for heat treatment tooth form deformation of spiral bevel gear. Based on the Levenberg-Marquardat method, a stable and accurate numerical solution for the reverse adjustment amount of the cutting parameters is solved. Firstly, a mathematical model of the tooth surface of spiral bevel gears was established based on the cutting parameters. Secondly, the effect law of each cutting parameter on tooth form was studied by using the method of small variable perturbation. Finally, based on the tooth form error sensitivity coefficient matrix, a reverse adjustment correction model of tooth cutting is established to compensate the heat treatment tooth form deformation by reserving the tooth cutting allowance in the tooth cutting stage. The effectiveness of the reverse adjustment correction model of tooth cutting was verified through experiments on reverse adjustment of tooth cutting processing. The experimental results show that the accumulative tooth form error of the spiral bevel gear after heat treatment is 199.8 μm, which is reduced by 67.71%, and the maximum tooth form error is 8.7 μm, which is reduced by 74.75%, after reverse adjustment of cutting parameters. This research can provide technical support and a theoretical reference for heat treatment tooth form deformation control and high-precision tooth cutting processing of spiral bevel gears.

Plasma Figure Correction Method Based on Multiple Distributed Material Removal Functions.

In the process of plasma figure correction for a quartz sub-mirror, the plasma parallel removal process and ink masking layer are combined for the first time. A universal plasma figure correction method based on multiple distributed material removal functions is demonstrated, and its technological characteristics are analyzed. Through this method, the processing time is independent of the workpiece aperture, which saves time for the material removal function to scan along the trajectory. After seven iterations, the form error of the quartz element is converged from the initial figure error of ~114 nm RMS to a figure error of ~28 nm RMS, which shows the practical potential of the plasma figure correction method based on multiple distributed material removal functions in optical element manufacturing and the possibility of becoming a new stage process in the optical manufacturing chain.

Least-squares phase-shifting algorithm of coherence scanning interferometry with windowed B-spline fitting, resampled and subdivided phase points for 3D topography metrology

3D topography metrology of optical micro-structured surfaces is critical for characterizing surface texture and form errors. The coherence scanning interferometry (CSI) faces many challenges for improving the accuracy of 3D topography metrology. In this paper, the least-squares (L-S) phase-shifting algorithm of coherence scanning interferometry with windowed B-spline fitting, resampled and subdivided phase points is proposed, which provides high accuracy of 3D surface topography. The proposed algorithm avoids the introduction of complex judgment criterion of fringe orders, and tedious phase unwrapping. Comparison with generalized phase-shifting algorithm, the wrong textures do not appear on the reconstructed 3D surfaces and 2D profiles for optical grating and Micro-lens array (MLA) surfaces using the proposed algorithm. Experimental results show that a VLSI step surface has high repeated measurement accuracy with a standard deviation of 1.6 nm, the periodic error of the proposed algorithm for PMMA MLA sub-aperture units is about 20 nm, and the mean value of PMMA MLA four random sub-aperture units are 6.66 nm (Sq), 77.63 nm (Sp), 36.38 nm (Sv), 114.18 nm (Sz) and 4.90 nm (Sa), respectively.