Root Shape Research Articles

Damage detection and localization of a steel truss bridge model subjected to impact and white noise excitations using empirical wavelet transform neural network approach

This paper aims to present a computational and experimental investigation on the performance of a new damage detection approach based on empirical wavelet transform (EWT) and an artificial neural network (ANN) named EWT-ANN to detect the damage existence, intensity, and location in a laboratory-scale model of a steel truss bridge in healthy and damaged states when exposed to white noise and impact excitations. In addition, five signal features of the decomposed mode components by EWT including energy, root mean square (RMS), shape factor, kurtosis, and entropy are extracted and defined as the targets of ANN to quantitatively and qualitatively assess the proposed approach. It is found that the proposed approach based on the time-domain signal features is efficiently able in identifying the damage location, and severity when the truss is subjected to impact loading excitation.

The resin-matrix cement layer thickness resultant from the intracanal fitting of teeth root canal posts: an integrative review.

The aim of this study was to perform an integrative review on the layer thickness and microstructure of resin-matrix cements around custom-made or standard teeth root intracanal posts. An electronic search was conducted on the PubMed using a combination of the following scientific terms: intraradicular post, root intracanal post, resin cement, thickness, adaptation, endodontic post, layer thickness, fit, shape, and endodontic core. The literature selection criteria accepted articles published in the English language, up to May 2021, involving in vitro analyses, meta-analyses, randomized controlled trials, and prospective cohort studies. The search identified 154 studies, of which 24 were considered relevant to this study. The selectedstudies provided important data considering cement layer thickness, tooth preparation, endodontic post, and type of resin-matrix cement. The anatomical variability of root canal systems, such as the oval- orC-shaped, represents a challenge in dental restoration with tooth root intracanal posts. The fitting of intracanal posts to different rootregions is variable resulting in thick and irregular layers of resin-matrix cement. Defects like pores, micro-cracks, and micro-gaps were detected in the resin-matrix cement microstructure and represent spots of stress concentration and fracture. Custom-made tooth rootintracanal posts provide a proper fitting and decrease the layer thickness of resin-matrix cement. In fact, the layer thickness of resin-matrix cements depends on the fitting of endodontic posts to tooth root canals. An increase of resin cementthickness causes the appearance ofdefects like pores, micro-cracks, and micro-gaps that can induce stress concentration and fractures at interfaces. The fitting of the endodonticpost into the teeth root canal determine the layer thickness of the resin-matrix cement to establishan adequate retention.However, the increase in the thickness of the resin-matrix cement layer can lead to a high number of defects like pores or cracks and therefore decrease the strength of the interface.

RSAtrace3D: robust vectorization software for measuring monocot root system architecture

BackgroundThe root distribution in the soil is one of the elements that comprise the root system architecture (RSA). In monocots, RSA comprises radicle and crown roots, each of which can be basically represented by a single curve with lateral root branches or approximated using a polyline. Moreover, RSA vectorization (polyline conversion) is useful for RSA phenotyping. However, a robust software that can enable RSA vectorization while using noisy three-dimensional (3D) volumes is unavailable.ResultsWe developed RSAtrace3D, which is a robust 3D RSA vectorization software for monocot RSA phenotyping. It manages the single root (radicle or crown root) as a polyline (a vector), and the set of the polylines represents the entire RSA. RSAtrace3D vectorizes root segments between the two ends of a single root. By utilizing several base points on the root, RSAtrace3D suits noisy images if it is difficult to vectorize it using only two end nodes of the root. Additionally, by employing a simple tracking algorithm that uses the center of gravity (COG) of the root voxels to determine the tracking direction, RSAtrace3D efficiently vectorizes the roots. Thus, RSAtrace3D represents the single root shape more precisely than straight lines or spline curves. As a case study, rice (Oryza sativa) RSA was vectorized from X-ray computed tomography (CT) images, and RSA traits were calculated. In addition, varietal differences in RSA traits were observed. The vector data were 32,000 times more compact than raw X-ray CT images. Therefore, this makes it easier to share data and perform re-analyses. For example, using data from previously conducted studies. For monocot plants, the vectorization and phenotyping algorithm are extendable and suitable for numerous applications.ConclusionsRSAtrace3D is an RSA vectorization software for 3D RSA phenotyping for monocots. Owing to the high expandability of the RSA vectorization and phenotyping algorithm, RSAtrace3D can be applied not only to rice in X-ray CT images but also to other monocots in various 3D images. Since this software is written in Python language, it can be easily modified and will be extensively applied by researchers in this field.

New Strategies and Instruments for Root Canal Shaping Procedure: An Overview

Cone-beam computed tomography-based three-dimensional analysis of root canal trajectories and shapes have clearly shown that root canals are more complex in 3D, compared to traditional 2D visualization,1-4 and consequently, these findings affect properties of the nickel-titanium (NiTi) files requiring the following factors.

A Digital Image-Based Phenotyping Platform for Analyzing Root Shape Attributes in Carrot

Root shape in carrot (Daucus carota subsp. sativus), which ranges from long and tapered to short and blunt, has been used for at least several centuries to classify carrot cultivars. The subjectivity involved in determining market class hinders the establishment of metric-based standards and is ill-suited to dissecting the genetic basis of such quantitative phenotypes. Advances in digital image acquisition and analysis has enabled new methods for quantifying sizes of plant structures and shapes, but in order to dissect the genetic control of the shape features that define market class in carrot, a tool is required that quantifies the specific shape features used by humans in distinguishing between classes. This study reports the construction and demonstration of the first such platform, which facilitates rapid phenotyping of traits that are measurable by hand, such as length and width, as well as principal component analysis (PCA) of the root contour and its curvature. This latter approach is of particular interest, as it enabled the detection of a novel and significant quantitative trait, defined here as root fill, which accounts for 85% of the variation in root shape. Curvature analysis was demonstrated to be an effective method for precise measurement of the broadness of the carrot shoulder, and degree of tip fill; the first principal component of the respective curvature profiles captured 87% and 84% of the total variance. This platform’s performance was validated in two experimental panels. First, a diverse, global collection of germplasm was used to assess its capacity to identify market classes through clustering analysis. Second, a diallel mating design between inbred breeding lines of differing market classes was used to estimate the heritability of the key phenotypes that define market class, which revealed significant variation in the narrow-sense heritability of size and shape traits, ranging from 0.14 for total root size, to 0.84 for aspect ratio. These results demonstrate the value of high-throughput digital phenotyping in characterizing the genetic control of complex quantitative phenotypes.

Molecular genetic diversity and population structure analyses of rutabaga accessions from Nordic countries as revealed by single nucleotide polymorphism markers

BackgroundRutabaga or swede (Brassica napus ssp. napobrassica (L.) Hanelt) varies in root and leaf shape and colour, flesh colour, foliage growth habits, maturity date, seed quality parameters, disease resistance and other traits. Despite these morphological differences, no in-depth molecular analyses of genetic diversity have been conducted in this crop. Understanding this diversity is important for conservation and broadening the use of this resource.ResultsThis study investigated the genetic diversity within and among 124 rutabaga accessions from five Nordic countries (Norway, Sweden, Finland, Denmark and Iceland) using a 15 K single nucleotide polymorphism (SNP) Brassica array. After excluding markers that did not amplify genomic DNA, monomorphic and low coverage site markers, the accessions were analyzedwith 6861 SNP markers. Allelic frequency statistics, including polymorphism information content (PIC), minor allele frequency (MAF) and mean expected heterozygosity ( overline{H} e) and population differentiation statistics such as Wright’s F-statistics (FST) and analysis of molecular variance (AMOVA) indicated that the rutabaga accessions from Norway, Sweden, Finland and Denmark were not genetically different from each other. In contrast, accessions from these countries were significantly different from the accessions from Iceland (P < 0.05). Bayesian analysis with the software STRUCTURE placed 66.9% of the rutabaga accessions into three to four clusters, while the remaining 33.1% constituted admixtures. Three multivariate analyses: principal coordinate analysis (PCoA), the unweighted pair group method with arithmetic mean (UPGMA) and neighbour-joining (NJ) clustering methods grouped the 124 accessions into four to six subgroups.ConclusionOverall, the correlation of the accessions with their geographic origin was very low, except for the accessions from Iceland. Thus, Icelandic rutabaga accessions can offer valuable germplasm for crop improvement.

Numerical modeling to optimize nitrogen fertigation with consideration of transient drought and nitrogen stress

Optimization of nitrogen (N) fertigation is a formidable challenge involving complex interactions between water and N uptake and their effects on crop production. Numerical models can be useful in studying the interaction of multiple variables like those found in mechanistic simulations of N fertigation strategies. The physical aspects can often be accurately represented in soil-plant-atmosphere continuum models, while the biological factors lag due to their oversimplification. When optimizing N fertigation using numerical models, it is essential to consider the effects of N and water stresses on the plant size and corresponding feedback on potential transpiration and N uptake. The HYDRUS (2D/3D) model was modified to allow for active uptake and decay of multiple solutes and reduce potential transpiration due to a limitation in N uptake. Subsequently, we calibrated and validated the model with a dataset that consisted of 3 nitrate (NO3-) concentration and 6 irrigation levels: a total of 18 distinct treatments used to fertigate cucumber plants grown in lysimeters. The calibration was based on the treatment that received the highest N fertigation. The model was validated by testing its ability to accurately reduce potential N uptake and transpiration in water and N deficiency cases. Simulations showed that the N stress function could explain 82% of the reduction in transpiration measured in the experimental setup. The sensitivity analysis, evaluating the effects of the root shape and distribution parameters by increasing and decreasing their values by 20%, showed that these parameters had little impact on the results. Following its validation, the model was used to determine the optimal N concentration in irrigation water and the optimal N application amount to obtain maximal yield with minimal N loss. The optimal irrigation water NO3--N concentration and seasonal NO3--N application were determined to be 75 mg L−1 and 40 mg m−2, respectively.

Genetic variation in a radish (Raphanus sativus L.) geodiversity collection

A radish panel of 152 accessions with diverse root shapes was assembled from the National Plant Germplasm System (NPGS) collection based on weighted geographical sampling. Accessions represented 35 countries and were categorized into eight geographical regions—North America, Europe, Africa, West Asia, Central Asia, South Asia, East Asia, and Southeast Asia. Multiple plants per accession were assayed using genotyping by sequencing (GBS), and 8539 high-quality polymorphisms were discovered. Average observed heterozygosity (Ho) of the markers consistently ranged from 5 to 7% in all geographical regions. Central Asia was most diverse in terms of average expected heterozygosity (He = 0.107), while Southeast Asia was the least diverse (He = 0.050). Europe and Southeast Asia were the most divergent from each other (pairwise FST = 0.199), while Europe and North America were the least divergent (pairwise FST = 0.022). The clustering of genotypes based on principal components analysis (PCA) illustrated an east/west geographical pattern. Large numbers of private alleles and a substantial proportion (3%) of markers showing signals of selection based on allele frequency differences indicate that allelic variation is available for cultivar development. European and North American gene pools could be expanded by crossing with East Asian and Southeast Asian germplasm, and vice-versa. Both could potentially benefit from South Asian sources, while the addition of West Asian germplasm could increase East Asian and Southeast Asian diversity. This resource for molecular marker development combined with an understanding of global genetic relationships will inform the continued germplasm conservation and genetic improvement of radish.

A cellophane-supported Arabidopsis culture for seamless transfer between different media is useful for studying various nitrogen responses

ABSTRACT Transferring plants between different nutritional media is a common technique in plant nutrition research. Solidified sterile media are often used for plant culture and subsequent transfer experiments. Transplanting is generally performed one plant at a time using sterile tweezers. This method has several challenges: it is time-consuming, which makes analyzing short-term responses to nutritional changes difficult; plants can be mechanically damaged, which can confound results; transferring mature plants is accompanied by root wounding due to root penetration into the solidified medium; and root shapes are altered, which precludes a precise evaluation on nutritional responses of root system architecture. To solve these problems, this study tried to adopt a system for Arabidopsis culture using solidified media covered with cellophane disks for the transfer experiments to analyze nitrogen responses as a case study. The cellophane disk prevented the penetration of roots into the solidified medium and fixed the roots loosely; thereby, facilitating sterile, rapid and noninvasive transfer of young and mature Arabidopsis plants between media without changing root shape. The plants-on-cellophane grown on the solidified media were directly transferred onto hydroponics, where plants vegetate and propagate seeds under strict nutritional control. The root proliferation on the cellophane disk allowed direct observations of root architecture and green fluorescent protein (GFP) fluorescence in the roots. Collectively, we conclude that the introduction of a cellophane sheet to the existing culture system would accelerate experiments in plant nutritional research.

Genetic diversity structure of western-type carrots

BackgroundCarrot is a crop with a wide range of phenotypic and molecular diversity. Within cultivated carrots, the western gene pool comprises types characterized by different storage root morphology. First western carrot cultivars originated from broad-based populations. It was followed by intercrosses among plants representing early open-pollinated cultivars, combined with mass phenotypic selection for traits of interest. Selective breeding improved root uniformity and led to the development of a range of cultivars differing in root shape and size. Based on the root shape and the market use of cultivars, a dozen of market types have been distinguished. Despite their apparent phenotypic variability, several studies have suggested that western cultivated carrot germplasm was genetically non-structured.ResultsNinety-three DcS-ILP markers and 2354 SNP markers were used to evaluate the structure of genetic diversity in the collection of 78 western type open-pollinated carrot cultivars, each represented by five plants. The mean percentage of polymorphic loci segregating within a cultivar varied from 31.18 to 89.25% for DcS-ILP markers and from 45.11 to 91.29% for SNP markers, revealing high levels of intra-cultivar heterogeneity, in contrast to its apparent phenotypic stability. Average inbreeding coefficient for all cultivars was negative for both DcS-ILP and SNP, whereas the overall genetic differentiation across all market classes, as measured by FST, was comparable for both marker systems. For DcS-ILPs 90–92% of total genetic variation could be attributed to the differences within the inferred clusters, whereas for SNPs the values ranged between 91 to 93%. Discriminant Analysis of Principal Components enabled the separation of eight groups cultivars depending mostly on their market type affiliation. Three groups of cultivars, i.e. Amsterdam, Chantenay and Imperator, were characterized by high homogeneity regardless of the marker system used for genotyping.ConclusionsBoth marker systems used in the study enabled detection of substantial variation among carrot plants of different market types, therefore can be used in germplasm characterization and analysis of genome relationships. The presented results likely reveal the actual genetic diversity structure within the western carrot gene pool and point at possible discrepancies within the cultivars’ passport data.

The human EDAR 370V/A polymorphism affects tooth root morphology potentially through the modification of a reaction\u2013diffusion system

Morphological variations in human teeth have long been recognized and, in particular, the spatial and temporal distribution of two patterns of dental features in Asia, i.e., Sinodonty and Sundadonty, have contributed to our understanding of the human migration history. However, the molecular mechanisms underlying such dental variations have not yet been completely elucidated. Recent studies have clarified that a nonsynonymous variant in the ectodysplasin A receptor gene (EDAR 370V/A; rs3827760) contributes to crown traits related to Sinodonty. In this study, we examined the association between the EDAR polymorphism and tooth root traits by using computed tomography images and identified that the effects of the EDAR variant on the number and shape of roots differed depending on the tooth type. In addition, to better understand tooth root morphogenesis, a computational analysis for patterns of tooth roots was performed, assuming a reaction–diffusion system. The computational study suggested that the complicated effects of the EDAR polymorphism could be explained when it is considered that EDAR modifies the syntheses of multiple related molecules working in the reaction–diffusion dynamics. In this study, we shed light on the molecular mechanisms of tooth root morphogenesis, which are less understood in comparison to those of tooth crown morphogenesis.

Ama Verbs in Comparative Perspective

Ama verbs are comparable with Nubian and other related languages in their clause-final syntax, CVC root shape, and some affixes. However, there is also considerable innovation in adjoined relative clauses, a shift from number to aspect marking traced by T/K morphology, and other changes in the order and meaning of affixes. These developments show a unique trend of concretization of core clause constituents, and internal growth in the complexity of verbs in isolation from other languages. On the other hand, Ama’s stable distributive pluractional represents a wider Eastern Sudanic category. The late loss of pronominal subject marking supports a hypothesis that the Ama language was used for inter-group communication with Kordofan Nubians.

Effects of root-cortex relationship, root shape, and impaction side on treatment duration and root resorption of impacted canines.

This retrospective longitudinal study aimed to evaluate the factors that affect the orthodontic treatment duration (OTD) and external apical root resorption (EARR) of maxillary impacted canines (MIC) as root-cortex relationship, root shape, impaction side, and gender. Thirty-eight patients (mean age 15.28 ± 1.48 years) who had unilateral MIC and undergone orthodontic treatment were included in this study. Root-cortex relationship, root-cortex intersection amount, root shape, impaction side, height, alpha angle, impaction zone, and length of the MIC were evaluated on cone-beam computed tomography images at the beginning of the treatment. Final assessments were performed on ortopantograms at the end of the treatment as canine angulation and tooth length. The sample was characterized by descriptive statistics; t-tests, Mann-Whitney U-test, ANOVA, and Kruskal-Wallis tests were used for the comparison of EARR and OTD values between the categorical groups. Root shape affected OTD, and the longest value was detected in MIC with bent root (P < 0.000). The presence of root-cortex relationship also prolonged OTD for approximately 3 months (P = 0.006). MIC with risk factors like positive root-cortex relationship and bent roots had higher EARR values than those with negative root-cortex relationship and normal roots (P = 0.042, P = 0.021, respectively). EARR of the palatal MIC was also higher than the buccal MIC (P = 0.009). OTD was significantly influenced by root-cortex intersection amount (P = 0.004). The presence of root-cortex relationship and abnormal root shape were risk factors for greater EARR of MIC along OTD, which was also significantly influenced by root shape and root-cortex relationship.

Magiczne i lecznicze właściwości pokrzyku na podstawie staropolskich zielników

The aim of the article is to analyse the way of the description the nightshade as curative herb as well as polish mandrake’s equivalent. Researches based on Old Polish herbariums written by Stefan Falimirz, Marcin from Urzędów and Szymon Syreński. In this article was also important the issue of etymology of polish name of Atropa belladonna (in polish: pokrzyk – krzyk [scream], krzak [bush]) and level of medical knowledge in 16th and 17th centuries. The author also compared nightshade to mandrake: their properties (psychedelic, curative), morphologic qualities and beliefs connected to anthropoid shape of root, supposed deadly scream of plant pulled from the ground or use of this herb in magic.

There is no Stem: the Distribution of Verbal Allomorphs, a Distributed Morphology Analysis

It is widely accepted by traditional grammarians and linguists that Persian verbal roots fall into two forms depending on their tense feature: present stem and past stem. In contrast to this traditional view, the present study considers an alternative notion of allomorphy, indicating that a few verbs use a basic form, called “morph”, in all morphosyntactic contexts while some other roots allow for having two or more allomorphs. Within the framework of Distributed Morphology, especially on the basis of underspecification condition, I will review the empirical evidence adduced in favor of the hypothesis that the tense feature has no role in producing and selecting the so-called present and past stems. In this approach, the systematic distribution of verbal allomorphs like /suz/ and /sux/ (derived from “OSUZ” = burn) is constrained by some other formal features, such as adjacency to the morphophoneme {D}, absorbing the causative suffix (“-ān” or its free variation “-un”) or appearing in the boundary of a word. Finally, to avoid terminological and empirical confusion, I will suggest that we should avoid the use of the term “stem” altogether and speak of root, morph and allomorphs only. It should be added that the different variations in phonetic shape of lexical roots are divided into two classes: the first one follows from the phonological rules and the second one is affected by the morphophonological (or readjustment) rules. Phonological changes are predictable and produce automatic alternations, but unpredictable morphophonological changes lead to non-automatic alternations. Following the general trend of DM, I restrict the term “allomorphy” to those cases in which the variation in phonetic shape of a morpheme does not follow from the automatic phonological rules of the language. This analysis raises the theoretical question of whether language-specific readjustment rules (i.e. the alteration of root or affix phonology) are needed for morphological theory. Rejecting readjustment rules, I show that allomorphs of verbal roots are independently stored in Vocabulary.

EXTRACTION OF ECTOPIC MAXILLAR THIRD MOLARS AFTER CONE BEAM COMPUTED TOMOGRAPHY SURGICAL PLANNING: A CASE REPORT

Intraoperative imaging is increasingly used by surgeons and has become an integral part of many surgical procedures. Ectopically impacted third molars in the upper jaw, become a common developmental abnormality. Surgical planning of a case with bilaterally impacted maxillary teeth by using cone beam computed tomography is presented. The 3D model provide valuable information for improved diagnosis and treatment plan and ultimately results in more successful treatment, as in the present case. The surgeon, knowing the precise location of the tooth and shape of roots in all projections would reduce the invasiveness of surgery. This report describes a case of impacted upper wisdom teeth without any associated pathologic condition. Keywords:&nbsp;Third Molar; Ectopic Molar, Maxillary Sinus; Headache; Cone Beam Computed Tomography

Agro-morphometric Diversity Analysis in Carrot Germplasm from Indian Genebank

Carrot is a nutrient rich and commercially important root vegetable in India. A study was undertaken in rabi seasons of 2015-16 and 2016-17 to assess the agro-morphological diversity in 100 accessions collected from different regions of India and from other countries. Wide variation was observed in accessions for qualitative (root and core colour) and quantitative (plant length, root length and length, shoulder, root, core size, number of leaves per plant, total plant weight root yield etc.) traits. Maximum accessions had red and mixture of light red (45) to light purple roots (38). Only orange accessions had uniformity in root shape and colour. Wide variation was observed in root length (13.6-25.6 cm) and shoot length (25.0 - 88.3 cm). The study revealed wide variation in carrot germplasm maintained by Indian genebank, however, intra-population variation needs to be fixed before use in breeding.

Oral manifestations and rehabilitation of a patient with osteogenesis imperfecta

Introduction. Osteogenesis imperfecta is a rare heritable connective tissue disorder characterized by increased fragility of the bony tissue. The incidence of orofacial alterations associated with osteogenesis imperfecta is variable and includes dentinogenesis imperfecta, malocclusions, hypoplasia of the jaws, delayed dental development and structural abnormalities of the teeth. Case outline. A 22-year-old female was referred to the Clinic for Pediatric and Preventive Dentistry for dental treatment. Enlarged head, triangular-shaped face, mandibular prognathism with excessive maxillary hypoplasia, lowered vertical occlusal dimension were present features. The intraoral findings included dentinogenesis imperfecta with Kennedy?s class IV in the upper jaw and class II in the lower jaw. Panoramic radiograph revealed abnormalities in the crown and root shape, obliteration of the pulp chamber and severe deficiency of alveolar bone mass. Overall treatment involved five phases: I ? preventive and prophylactic treatment, II ? direct restauration of five teeth with glass ionomer cement, III ? extraction of severely damaged teeth, IV ? prosthodontic rehabilitation with removable partial dentures, V ? maintenance and follow-up phase. Conclusion. Low prevalence and wide variety of signs and symptoms make dental treatment of osteogenesis imperfecta overly complex and challenging. Nevertheless, it is essential to improve craniofacial and dental function along with facial aesthetic.

The Prevalence of Root Resorption after Orthodontic Treatment in Patients Attending a University Hospital Dental Clinic.

Introduction:After orthodontic treatment, some teeth undergo external root resorption due to different factors, such as the root shape, oral habits, biological and genetic factor, gender, and age. Furthermore, extraction cases, long treatment duration, and the amount of force applied during the treatment might be related to root resorption.Materials and Methods:Panoramic radiographs for 226 patients treated in the orthodontic department were screened. The lower first permanent molars, lower second premolars, and lower first premolars were measured in centimeters on a ruler using ImageJ System. Teeth were measured from the cusp tip to the cementoenamel junction (CEJ) and from the CEJ to the root apex, and then, the tooth was measured as a whole before and after the treatment.Results:Multiple analysis of variance showed that there were no interactions between the root lengths of all teeth tested and either gender, treatment type, or treatment duration (P > 0.05).Conclusion:Based on the results of this study, no statistically significance relationship between external apical root resorption and gender, type of treatment, and treatment duration was found.

Fault Dynamic Modeling and Characteristic Parameter Simulation of Rolling Bearing with Inner Ring Local Defects

To further study the fault mechanism and fault features of rolling bearings, a two‐DOF rolling bearing fault dynamic model with inner ring local defects considering the bearing radial clearance and time‐varying displacement excitation is established based on Hertz contact theory. By comparing the simulated fault signal with bearing fault test data in the time domain and frequency domain, the accuracy of the established fault dynamic model is verified. Finally, the change rules of the characteristic parameters of the bearing inner ring fault signal, including effective value, absolute mean value, square root amplitude, peak value, kurtosis factor, pulse factor, peak factor, and shape factor, are simulated by the fault dynamic model. The results highlight that the proposed fault dynamic model is in good agreement with the experimental results. The model can simulate the fault signal characteristic parameters with the change of defect width, external load, and rotating speed effectively. The study in this paper is of engineering application value for bearing condition monitoring and fault diagnosis.