U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

You searched for: Subject "principal component analysis" Remove constraint Subject: "principal component analysis"
Start Over

Search

27,480  Search Results

« Previous | 1 - 20 of 27,480 |
Number of results to display per page

Search Results

1. Spatial segmentation of mass spectrometry imaging data featuring selected principal components

Author:
Yuchen Zou; Weiwei Tang; Bin Li
Source:
Talanta 2023 v.253 pp. 123958
ISSN:
0039-9140
Subject:
principal component analysis,   etc   ; data collection; mass spectrometry; mice; rats;     Show all 5 Subjects
Abstract:
... Spatial segmentation aims to find homogeneous/heterogeneous subgroups of spectra or ion images in mass spectrometry imaging (MSI) data. The maps it generated inform researchers of vital characteristics of the data and thus provide the basis for strategizing further biological analysis. Dimensional reduction and clustering are two basic steps of segmentation. Due to the variations in the quality, r ...
DOI:
10.1016/j.talanta.2022.123958

2. Data cluster analysis and machine learning for classification of twisted bilayer graphene

Author:
Tom Vincent; Kenji Kawahara; Vladimir Antonov; Hiroki Ago; Olga Kazakova
Source:
Carbon 2023 v.201 pp. 141-149
ISSN:
0008-6223
Subject:
principal component analysis,   etc   ; Raman spectroscopy; automation; cluster analysis; graphene; models;     Show all 6 Subjects
Abstract:
... Twisted bilayer graphene (TBLG) has emerged as an exciting new material with tunable electronic properties, but current methods of fabrication and identification of TBLG are painstaking and laborious. We combine Raman spectroscopy with Gaussian mixture model (GMM) data clustering to identify areas with particular twist angles, from a TBLG sample with a mixture of orientations. We present two appro ...
DOI:
10.1016/j.carbon.2022.09.021

3. Characterization and comparison of the aroma-active compounds on different grades of sesame-flavor Baijiu by headspace solid-phase microextraction and gas chromatography-olfactometry-mass spectrometry

Author:
Dan Qin; Jiawen Duan; Hehe Li; Fuping Zheng; Huan Cheng; Xingqian Ye; Baoguo Sun
Source:
Food science and human wellness 2023 v.12 no.1 pp. 79-88
ISSN:
2213-4530
Subject:
principal component analysis,   etc   ; food science; headspace analysis; humans; odors; phenylacetaldehyde; solid phase microextraction; spectroscopy;     Show all 8 Subjects
Abstract:
... This study investigated the aroma-active compounds and compared the differences of three different grades of sesame-flavor Baijiu by headspace solid-phase microextraction (HS-SPME) coupled with gas chromatography-olfactometry-mass spectrometry (GC-O-MS). A total of 54 aroma-active compounds were detected. Principal component analysis showed that JZ1, JZ2, and JZ3 were well separated from each othe ...
DOI:
10.1016/j.fshw.2022.07.025

4. Time-dependent rheological behavior of pineapple pulp foam and its relationship with foaming properties and quality attributes of dried powder

Author:
Arjuara Begum; Dipsikha Kalita; Suvendu Bhattacharya; Brijesh Srivastava
Source:
Journal of food engineering 2023 v.336 pp. 111208
ISSN:
0260-8774
Subject:
principal component analysis,   etc   ; drainage; dried skim milk; foams; moisture diffusivity; pineapples; pulp; rheological properties;     Show all 8 Subjects
Abstract:
... The time-dependent rheological characteristics of pineapple pulp foam (PPF), prepared by whipping the pulp with varying concentrations (2–6%) of skim milk powder (SMP), were investigated at different shear rates (1, 10, and 50 s⁻¹). The PPF showed time-dependent shear-thinning behavior that could be explained by the Hahn and Figoni-Shoemaker models (r≤0.997). The time and shear-rate-dependent stru ...
DOI:
10.1016/j.jfoodeng.2022.111208

5. Extraction of heterocyclic amines and polycyclic aromatic hydrocarbons from pork jerky and the effect of flavoring on formation and inhibition

Author:
Y.W. Lai; Y.T. Lee; H. Cao; H.L. Zhang; B.H. Chen
Source:
Food chemistry 2023 v.402 pp. 134291
ISSN:
0308-8146
Subject:
principal component analysis,   etc   ; acetic acid; acetonitrile; food chemistry; heterocyclic compounds; meat jerky; soy sauce; temperature;     Show all 8 Subjects
Abstract:
... Heterocyclic amines (HAs) and polycyclic aromatic hydrocarbons (PAHs)are widely distributed in foods.This study aims to extract PAHs and HAs from pork jerky simultaneously by QuEChERS for analysis by GC–MS/MS and UPLC-MS/MS, respectively. Also,the effects of flavoring materials and processing temperature on the formation of PAHs and HAswere studied. Acetonitrile containing 1% acetic acid possessed ...
DOI:
10.1016/j.foodchem.2022.134291

6. Size characteristics of asbestiform fibers in lung tissue of animals that grazed in areas rich in ophiolitic outcrops in Central Calabria (Southern Italy)

Author:
Maria Rosaria Bruno; Annapaola Cannizzaro; Angelo Olori; Francesca Tombolini; Federica Angelosanto; Francesco Sinopoli; Biagio Maria Bruni; Francesco Casalinuovo; Antonella Campopiano
Source:
Science of the total environment 2023 v.856 pp. 159061
ISSN:
0048-9697
Subject:
principal component analysis,   etc   ; animal age; asbestos; carcinogenicity; durability; environment; humans; lungs; macrophages; phagocytosis; sheep; Italy;     Show all 12 Subjects
Abstract:
... In Calabria (Southern Italy) naturally occurring asbestos (NOA) mainly occurs in the ophiolitic sequences cropping in the Mount Reventino area. The most common type of asbestos detected was the amphibole tremolite; fibrous antigorite and minor chrysotile were also found. The development of asbestos-related diseases depends on, among other things, the morphological characteristics of fibers, length ...
DOI:
10.1016/j.scitotenv.2022.159061

7. Electrochemical investigation of edible oils: Experimentation, electrical signatures, and a supervised learning–case study of adulterated peanut oils

Author:
Anoop C. Patil; Ana Fernández la Villa; Arjun Kesav Mugilvannan; Untzizu Elejalde
Source:
Food chemistry 2023 v.402 pp. 134143
ISSN:
0308-8146
Subject:
principal component analysis,   etc   ; absorption; adulterated products; case studies; chromatography; dielectric spectroscopy; electrochemistry; food chemistry; oils; peanuts;     Show all 10 Subjects
Abstract:
... Traditional approaches to characterize edible oils such as chemical, chromatographic and light absorption techniques are laborious, expensive, and bulky to implement. This paper presents the electrochemical impedance spectroscopy of 13 types of edible oils, a rapid robust approach to characterizing the electrical behavior of oils without sample preparation. This is achieved through probing the oil ...
DOI:
10.1016/j.foodchem.2022.134143

8. Effects of different thermal processing methods on bioactive components, phenolic compounds, and antioxidant activities of Qingke (highland hull-less barley)

Author:
Qingyue Hong; Guangjing Chen; Zhirong Wang; Xuhui Chen; Jianquan Kan
Source:
Food science and human wellness 2023 v.12 no.1 pp. 119-129
ISSN:
2213-4530
Subject:
principal component analysis,   etc   ; antioxidant activity; barley; beta-glucans; dietary fiber; flavonoids; heat; humans; hydroxyl radicals; pentosans;     Show all 10 Subjects
Abstract:
... Qingke (highland hull-less barley) is a grain replete with substantial nutrients and bioactive ingredients. In this study, we evaluated the effects of boiling (BO), steaming (ST), microwave baking (MB), far-infrared baking (FB), steam explosion (SE), and deep frying (DF) on bioactive components, phenolic compounds, and antioxidant activities of Qingke compared with the effects of traditional roast ...
DOI:
10.1016/j.fshw.2022.07.030

9. Effect of cooking processes on tilapia aroma and potential umami perception

Author:
Danni Zhang; Charfedinne Ayed; Ian D. Fisk; Yuan Liu
Source:
Food science and human wellness 2023 v.12 no.1 pp. 35-44
ISSN:
2213-4530
Subject:
principal component analysis,   etc   ; Maillard reaction; color; freshwater fish; humans; odor compounds; odors; umami; water activity; water content;     Show all 10 Subjects
Abstract:
... Tilapia is a freshwater fish group with a sustainable prospect but suffers off-notes appearing during cooking processes. To promote pleasant odorants by thermal cooking processes, tilapia fillets were cooked in different ways (roasting, microwave-heating, boiling and steaming). Their aroma profiles were analysed with special focus on off-notes and umami-enhancing odorants by principal component an ...
DOI:
10.1016/j.fshw.2022.07.016

10. Toxicity assessment of polyethylene microplastics in combination with a mix of emerging pollutants on Physalaemus cuvieri tadpoles

Author:
Amanda Pereira da Costa Araújo; Thiarlen Marinho da Luz; Mohamed Ahmed Ibrahim Ahmed; Mir Mohammad Ali; Md. Mostafizur Rahman; Bojan Nataraj; Daniela de Melo e Silva; Damià Barceló; Guilherme Malafaia
Source:
Journal of environmental sciences (China) 2023 v.127 pp. 465-482
ISSN:
1001-0742
Subject:
principal component analysis,   etc   ; Physalaemus; amphibians; antioxidants; biomarkers; biometry; cholinesterase; cytotoxicity; microplastics; mutagenicity; polyethylene; stress response; water pollution; China;     Show all 14 Subjects
Abstract:
... Studies in recent years have shown that aquatic pollution by microplastics (MPs) can be considered to pose additional stress to amphibian populations. However, our knowledge of how MPs affect amphibians is very rudimentary, and even more limited is our understanding of their effects in combination with other emerging pollutants. Thus, we aimed to evaluate the possible toxicity of polyethylene MPs ...
DOI:
10.1016/j.jes.2022.05.013

11. VIS-NIR spectroscopy for detection of citrus core rot caused by Alternaria alternata

Author:
Narges Ghanei Ghooshkhaneh; Mahmood Reza Golzarian; Kaveh Mollazade
Source:
Food control 2023 v.144 pp. 109320
ISSN:
0956-7135
Subject:
principal component analysis,   etc   ; Alternaria alternata; Citrus; cultivars; food safety; fruits; fungi; industry; reflectance; spectrometers; spectroscopy; support vector machines;     Show all 12 Subjects
Abstract:
... Non-destructive identification of the fungal disease has great importance as one of the challenges of the citrus post-harvest industry. In order to identify the fungal disease of Alternaria alternata, which occurred internally, the reflectance spectra were collected in 3 areas of the stem-end, equatorial and stylar-end of healthy and fungus-infected oranges using VIS-NIR spectrometer (400–1100 nm) ...
DOI:
10.1016/j.foodcont.2022.109320

12. Geochemical fingerprint and spatial pattern of mine water quality in the Shaanxi-Inner Mongolia Coal Mine Base, Northwest China

Author:
Shen Qu; Xiangyang Liang; Fu Liao; Hairu Mao; Binhu Xiao; Limin Duan; Zheming Shi; Guangcai Wang; Ruihong Yu
Source:
Science of the total environment 2023 v.854 pp. 158812
ISSN:
0048-9697
Subject:
principal component analysis,   etc   ; coal; ecosystems; environment; fluorine; groundwater; groundwater flow; salinity; sodium carbonate; sulfates; water quality; China; Mongolia;     Show all 13 Subjects
Abstract:
... The spatial distribution of mine water quality and geochemical controls must be investigated for water safety and ecosystem protection in Shaanxi-Inner Mongolian Coal Mine Base (SICMB). Based on 122 mine water samples collected from 14 mining areas, self-organizing maps (SOM) combining with principal component analysis (PCA) derived that the mine water samples were classified into seven clusters. ...
DOI:
10.1016/j.scitotenv.2022.158812

13. Source apportionment of serum PFASs in two highly exposed communities

Author:
Dylan J. Wallis; Kelsey E. Barton; Detlef R.U. Knappe; Nadine Kotlarz; Carrie A. McDonough; Christopher P. Higgins; Jane A. Hoppin; John L. Adgate
Source:
Science of the total environment 2023 v.855 pp. 158842
ISSN:
0048-9697
Subject:
principal component analysis,   etc   ; National Health and Nutrition Examination Survey; blood serum; environment; humans; nutrition; regression analysis; Colorado; North Carolina;     Show all 9 Subjects
Abstract:
... Per- and polyfluoroalkyl substances (PFASs) are synthetic chemicals that are ubiquitous in environmental and biological systems, including human serum. PFASs are used in many products and industrial processes and are tied to numerous health effects. Due to multiple sources and exposure pathways, methods are needed to identify PFAS sources in communities to develop targeted interventions. We assess ...
DOI:
10.1016/j.scitotenv.2022.158842

14. Absorbance-transmission and fluorescence excitation-emission matrix (A-TEEM) with multi-block data analysis and machine learning for accurate intraregional classification of Barossa Shiraz wine

Author:
Ranaweera K.R. Ranaweera; Susan E.P. Bastian; Adam M. Gilmore; Dimitra L. Capone; David W. Jeffery
Source:
Food control 2023 v.144 pp. 109335
ISSN:
0956-7135
Subject:
principal component analysis,   etc   ; absorption; alcohols; cluster analysis; data collection; discriminant analysis; fluorescence; food safety; fructose; glucose; pH; titratable acidity; wines;     Show all 13 Subjects
Abstract:
... Authentication of wine can be considered at different scales, with classification according to country, province/state, or appellation/wine producing region. An absorbance-transmission and excitation-emission matrix (A-TEEM) technique was applied for the first time to examine intraregional differences, using Shiraz wines (n = 186) produced during three vintages from five subregions of Barossa Vall ...
DOI:
10.1016/j.foodcont.2022.109335

15. Diagnosis of grape leaf diseases using automatic K-means clustering and machine learning

Author:
Seyed Mohamad Javidan; Ahmad Banakar; Keyvan Asefpour Vakilian; Yiannis Ampatzidis
Source:
Smart agricultural technology 2023 v.3 pp. 100081
ISSN:
2772-3755
Subject:
principal component analysis,   etc   ; color; computer vision; crop yield; disease diagnosis; grapes; leaf blight; leaves; measles; product quality; support vector machines;     Show all 11 Subjects
Abstract:
... Plant diseases often reduce crop yield and product quality; therefore, plant disease diagnosis plays a vital role in farmers’ management decisions. Visual crop inspections by humans are time-consuming and challenging tasks and, practically, can only be performed in small areas at a given time, especially since many diseases have similar symptoms. An intelligent machine vision monitoring system for ...
DOI:
10.1016/j.atech.2022.100081

16. PSP with trained assessors as alternative for descriptive analysis of a product with a complex sensory profile

Author:
E.I. Moelich; M. Muller; M. Kidd; M. van der Rijst; T. Næs; E. Joubert
Source:
Food quality and preference 2023 v.103 pp. 104704
ISSN:
0950-3293
Subject:
principal component analysis,   etc   ; Cyclopia genistoides; Cyclopia subternata; data collection; factor analysis; flavor; food quality; industry; odors; palate; quality control; sensory evaluation;     Show all 12 Subjects
Abstract:
... Rapid sensory profiling of a product over time presents a challenge in quality control, particularly when the product has a complex aroma and flavour profile. Polarized sensory positioning (PSP), based on the comparison of samples to fixed references, allows for rapid sensory profiling and data collection across multiple sessions. The efficacy of partial and global PSP for broad-based sensory prof ...
DOI:
10.1016/j.foodqual.2022.104704

17. Characteristics and distribution of phosphorus in surface sediments of a shallow lake

Author:
Ziwei Long; Zehua Ji; Yuansheng Pei
Source:
Journal of environmental sciences (China) 2023 v.124 pp. 50-60
ISSN:
1001-0742
Subject:
principal component analysis,   etc   ; agricultural pollution; bioavailability; biogeochemical cycles; esters; lakes; nuclear magnetic resonance spectroscopy; organic matter; orthophosphates; pH; risk; rivers; sediments; China;     Show all 14 Subjects
Abstract:
... Phosphorus (P) in sediments plays an important role in shallow lake ecosystems and has a major effect on the lake environment. The mobility and bioavailability of P primarily depend on the contents of different P forms, which in turn depend on the sedimentary environment. Here, sediment samples from Baiyangdian (BYD) lake were collected and measured by the Standards, Measurements, and Testing proc ...
DOI:
10.1016/j.jes.2021.10.012

18. Differentiating Thai Hom Mali rice cultivated inside and outside the Thung Kula Rong-Hai Plain using stable isotopic data combined with multivariate analysis

Author:
Supalak Kongsri; Chunyapuk Kukusamude
Source:
Journal of food composition and analysis 2023 v.115 pp. 104883
ISSN:
0889-1575
Subject:
principal component analysis,   etc   ; food composition; food quality; multivariate analysis; prediction; protected designation of origin; provenance; quality control; rice; stable isotopes; variance; Mali;     Show all 12 Subjects
Abstract:
... Rice geographic authentication has become an important issue in promoting food quality assurance and protection of consumer rights. Thai Hom Mali (THM) rice cultivated inside the Thung Kula Rong-Hai Plain is registered under the European Protected Geographical Indication (PGI). Stable isotope ratio (δ¹³C, δ¹⁵N, and δ¹⁸O) fingerprinting of THM rice cultivated inside (PGI) and outside (non-PGI) the ...
DOI:
10.1016/j.jfca.2022.104883

19. Fruit morphological and nutritional quality features of goji berry (Lycium barbarum L.) during fruit development

Author:
Yaping Ma; Zhuangji Wang; Yunmao Li; Xuerui Feng; Lihua Song; Handong Gao; Bing Cao
Source:
Scientia horticulturae 2023 v.308 pp. 111555
ISSN:
0304-4238
Subject:
principal component analysis,   etc   ; Lycium barbarum; betaine; cultivars; fertilizers; flavonoids; flowering; fructose; fruiting; fruits; galactose; growth models; nutritive value; polysaccharides; sucrose; sugar content;     Show all 16 Subjects
Abstract:
... Goji berry (Lycium barbarum L.) is one of the most pivotal economic crops with an exceptional nutritional value. Based on its high global consumption, understanding the fruit growth patterns and nutrient accumulation at each developmental stage is crucial for the field and production management of high-quality goji berry cultivars. In this study, a fruit growth and development model of goji berry ...
DOI:
10.1016/j.scienta.2022.111555

20. Determination of protein content in single black fly soldier (Hermetia illucens L.) larvae by near infrared hyperspectral imaging (NIR-HSI) and chemometrics

Author:
J.P. Cruz-Tirado; José Manuel Amigo; Douglas Fernandes Barbin
Source:
Food control 2023 v.143 pp. 109266
ISSN:
0956-7135
Subject:
principal component analysis,   etc   ; Hermetia illucens; Simuliidae; chemical analysis; chemometrics; feeds; food safety; least squares; markets; model validation; prediction; protein content; support vector machines;     Show all 13 Subjects
Abstract:
... The production of alternative proteins to meet the demand of a growing population has accelerated the growth of the market for edible insects. Black fly soldier (BFS) larvae (Hermetia illucens L.) have been widely studied globally due to their high content of fat, protein, and minerals, being mainly used for animal feed. Chemical analysis for determination of its composition is time consuming and ...
DOI:
10.1016/j.foodcont.2022.109266