Log in

Relevant bibliographies by topics / Whittle method / Journal articles

To see the other types of publications on this topic, follow the link: Whittle method.

Journal articles on the topic 'Whittle method'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Whittle method.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Vyzhva, Z., V. Demidov, and A. Vyzhva. "STATISTICAL SIMULATION OF RANDOM FIELD ON 2D AREA WITH WHITTLE-MATERN TYPECORRELATION FUNCTION IN THE GEOPHYSICAL PROBLEM OF ENVIRONMENT MONITORING." Visnyk of Taras Shevchenko National University of Kyiv. Geology, no. 3 (86) (2019): 55–61. http://dx.doi.org/10.17721/1728-2713.86.08.

Full text

Abstract:

Due to the increasing number of natural and technogenic disasters the development of geological environment monitoring system is actual one using modern mathematical tools and information technology. The local monitoring of potentially dangerous objects is an important part of the overall environment monitoring system. The complex geophysical research was conducted on Rivne NPP area. The monitoring observations radioisotope study of soil density and humidity near the perimeter of buildings is of the greatest interest among these. In this case a problem occurred to supplement simulated data that were received at the control of chalky strata density changes at the research industrial area with use of radioisotope methods on a grid that included 29 wells. This problem was solved in this work by statistical simulation method that provides the ability to display values (the random field of a research object on a plane) in any point of the monitoring area. The chalk strata averaged density at the industrial area was simulated using the built model and the involvement optimal in the mean square sense Whittle-Matern type correlation function. In this paper the method is used and the model and procedure were developed with enough adequate data for Whittle-Matern type correlation function. The model and algorithm were developed and examples of karst-suffusion phenomena statistical simulation were given in the problem of density chalk strata monitoring at the Rivne NPP area. The statistical model of averaged density chalk strata distribution was built in the plane and statistical simulation algorithm was developed using Whittle-Matern type correlation function on the basis of spectral decomposition. The research subject realizations were obtained with required detail and regularity at the observation grid based on the developed software. Statistical analysis of the numerical simulation results was done and tested for its adequacy.

APA, Harvard, Vancouver, ISO, and other styles

2

Marques, G. O. L. C. "Empirical aspects of the Whittle-based maximum likelihood method in jointly estimating seasonal and non-seasonal fractional integration parameters." Physica A: Statistical Mechanics and its Applications 390, no. 1 (2011): 8–17. http://dx.doi.org/10.1016/j.physa.2010.09.007.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Niño-Mora, José. "A Fast-Pivoting Algorithm for Whittle’s Restless Bandit Index." Mathematics 8, no. 12 (2020): 2226. http://dx.doi.org/10.3390/math8122226.

Full text

Abstract:

The Whittle index for restless bandits (two-action semi-Markov decision processes) provides an intuitively appealing optimal policy for controlling a single generic project that can be active (engaged) or passive (rested) at each decision epoch, and which can change state while passive. It further provides a practical heuristic priority-index policy for the computationally intractable multi-armed restless bandit problem, which has been widely applied over the last three decades in multifarious settings, yet mostly restricted to project models with a one-dimensional state. This is due in part to the difficulty of establishing indexability (existence of the index) and of computing the index for projects with large state spaces. This paper draws on the author’s prior results on sufficient indexability conditions and an adaptive-greedy algorithmic scheme for restless bandits to obtain a new fast-pivoting algorithm that computes the n Whittle index values of an n-state restless bandit by performing, after an initialization stage, n steps that entail (2/3)n3+O(n2) arithmetic operations. This algorithm also draws on the parametric simplex method, and is based on elucidating the pattern of parametric simplex tableaux, which allows to exploit special structure to substantially simplify and reduce the complexity of simplex pivoting steps. A numerical study demonstrates substantial runtime speed-ups versus alternative algorithms.

APA, Harvard, Vancouver, ISO, and other styles

4

Cowan, Richard. "Expected frequencies of DNA patterns using whittle's formula." Journal of Applied Probability 28, no. 4 (1991): 886–92. http://dx.doi.org/10.2307/3214691.

Full text

Abstract:

Given a realisation of a Markov chain, one can count the numbers of state transitions of each type. One can ask how many realisations are there with these transition counts and the same initial state. Whittle (1955) has answered this question, by finding an explicit though complicated formula, and has also shown that each realisation is equally likely. In the analysis of DNA sequences which comprise letters from the set {A, C, G, T}, it is often useful to count the frequency of a pattern, say ACGCT, in a long sequence and compare this with the expected frequency for all sequences having the same start letter and the same transition counts (or ‘dinucleotide counts' as they are called in the molecular biology literature). To date, no exact method exists; this paper rectifies that deficiency.

APA, Harvard, Vancouver, ISO, and other styles

5

Cowan, Richard. "Expected frequencies of DNA patterns using whittle's formula." Journal of Applied Probability 28, no. 04 (1991): 886–92. http://dx.doi.org/10.1017/s0021900200042790.

Full text

Abstract:

Given a realisation of a Markov chain, one can count the numbers of state transitions of each type. One can ask how many realisations are there with these transition counts and the same initial state. Whittle (1955) has answered this question, by finding an explicit though complicated formula, and has also shown that each realisation is equally likely. In the analysis of DNA sequences which comprise letters from the set {A, C, G, T}, it is often useful to count the frequency of a pattern, say ACGCT, in a long sequence and compare this with the expected frequency for all sequences having the same start letter and the same transition counts (or ‘dinucleotide counts' as they are called in the molecular biology literature). To date, no exact method exists; this paper rectifies that deficiency.

APA, Harvard, Vancouver, ISO, and other styles

6

Sun, Lianwei, Zhong-chao Li, and Rong-zhu Liang. "Simplified Analytical Method for Predicting the Lateral Ground Displacements due to Shield Tunnelling." Advances in Civil Engineering 2021 (June 21, 2021): 1–10. http://dx.doi.org/10.1155/2021/5524557.

Full text

Abstract:

Earth pressure balance or slurry shield tunnelling will squeeze the subsoils and lead to lateral outward ground displacement. However, current methods to estimate the shield tunnelling-induced ground displacements generally use the methods based on the face unsupported tunnelling (e.g., New Austrian tunnelling and open shield excavation), which cannot predict the lateral ground movement due to shield tunnelling. In this paper, a novel simplified analytical method is proposed to predict the ground lateral displacement during the shield advancing process. The key shield tunnelling operation factors, including the additional pressure of cutter head, the friction forces around shield body, the back-fill grouting pressure, and the soil volume loss are all considered. The lateral ground displacements induced by the four former factors are calculated by using Mindlin’s solutions. The soil volume loss-induced lateral ground displacement is calculated by employing the expression introduced by Pinto and Whittle. Combining with the displacement obtained from all the factors, the analytical method for lateral ground displacement induced by shield tunnelling is obtained. The applicability of the proposed analytical approach is verified with three well-documented case histories involving slurry shield and EPB shield machines.

APA, Harvard, Vancouver, ISO, and other styles

7

Niño-Mora, José. "Fast Two-Stage Computation of an Index Policy for Multi-Armed Bandits with Setup Delays." Mathematics 9, no. 1 (2020): 52. http://dx.doi.org/10.3390/math9010052.

Full text

Abstract:

We consider the multi-armed bandit problem with penalties for switching that include setup delays and costs, extending the former results of the author for the special case with no switching delays. A priority index for projects with setup delays that characterizes, in part, optimal policies was introduced by Asawa and Teneketzis in 1996, yet without giving a means of computing it. We present a fast two-stage index computing method, which computes the continuation index (which applies when the project has been set up) in a first stage and certain extra quantities with cubic (arithmetic-operation) complexity in the number of project states and then computes the switching index (which applies when the project is not set up), in a second stage, with quadratic complexity. The approach is based on new methodological advances on restless bandit indexation, which are introduced and deployed herein, being motivated by the limitations of previous results, exploiting the fact that the aforementioned index is the Whittle index of the project in its restless reformulation. A numerical study demonstrates substantial runtime speed-ups of the new two-stage index algorithm versus a general one-stage Whittle index algorithm. The study further gives evidence that, in a multi-project setting, the index policy is consistently nearly optimal.

APA, Harvard, Vancouver, ISO, and other styles

8

Numapau Gyamfi, Emmanuel, Kwabena A. Kyei, and Ryan Gill. "Long-memory in asset returns and volatility: evidence from West Africa." Investment Management and Financial Innovations 13, no. 2 (2016): 24–28. http://dx.doi.org/10.21511/imfi.13(2).2016.03.

Full text

Abstract:

This paper measures the degree of long-memory or long-range dependence in asset returns and volatility of two stock indices in Ghana and Nigeria. The presence of long-memory opens up opportunities for abnormal returns to be made by analyzing price history of a particular market. The authors employ the Hurst exponent to measure the degree of long-memory which is evaluated by a semiparametric method, the Local Whittle estimator. The ﬁndings show strong evidence of the presence of long-memory in both returns and volatility of the indices studied, suggesting that neither of the markets in Ghana and Nigeria is weak-form eﬃcient

APA, Harvard, Vancouver, ISO, and other styles

9

Poskitt, D. S., Gael M. Martin, and Simone D. Grose. "BIAS CORRECTION OF SEMIPARAMETRIC LONG MEMORY PARAMETER ESTIMATORS VIA THE PREFILTERED SIEVE BOOTSTRAP." Econometric Theory 33, no. 3 (2016): 578–609. http://dx.doi.org/10.1017/s0266466616000050.

Full text

Abstract:

This paper investigates bootstrap-based bias correction of semiparametric estimators of the long memory parameter, d, in fractionally integrated processes. The re-sampling method involves the application of the sieve bootstrap to data prefiltered by a preliminary semiparametric estimate of the long memory parameter. Theoretical justification for using the bootstrap technique to bias adjust log periodogram and semiparametric local Whittle estimators of the memory parameter is provided in the case where the true value of d lies in the range 0 ≤ d < 0.5. That the bootstrap method provides confidence intervals with the correct asymptotic coverage is also proven, with the intervals shown to adjust explicitly for bias, as estimated via the bootstrap. Simulation evidence comparing the performance of the bootstrap bias correction with analytical bias-correction techniques is presented. The bootstrap method is shown to produce notable bias reductions, in particular when applied to an estimator for which some degree of bias reduction has already been accomplished by analytical means.

APA, Harvard, Vancouver, ISO, and other styles

10

Liu, Y., D. Liu, Y. Du, et al. "Calculated interdiffusivities resulting from different fitting functions applied to measured concentration profiles in Cu-rich fcc Cu-Ni-Sn alloys at 1073 K." Journal of Mining and Metallurgy, Section B: Metallurgy 53, no. 3 (2017): 255–62. http://dx.doi.org/10.2298/jmmb170626022l.

Full text

Abstract:

Employing six groups of bulk diffusion couples together with electron probe microanalysis technique, the compositiondependences of ternary interdiffusion coefficients in Cu-rich fcc Cu-Ni-Sn alloys at 1073 K were determined via the Whittle and Green method. Different fitting functions applied to the measured concentration profiles are utilized to extract the interdiffusion coefficients of fcc Cu-Ni-Sn alloys. The errors for the obtained interdiffusivities are evaluated by a scientific method considering the error propagation. The calculated diffusion coefficients using the Boltzmann and additive Boltzmann functions are found to be with reasonable errors and show a general agreement with those using other fitting functions. Based on the Boltzmann and additive Boltzmann functions, the interdiffusivities in Cu-rich fcc Cu-Ni-Sn alloys at 1073 K are obtained and validated by thermodynamic constraints. The Boltzmann and additive Boltzmann functions are recommended to be used for the fitting of measured concentration profiles in other ternary systems for the sake of extracting ternary diffusivities.

APA, Harvard, Vancouver, ISO, and other styles

11

Ilhan, Mert, Fatma Tuğçe Gürağaç Dereli, Ibrahim Tümen, and Esra Küpeli Akkol. "Anti-inflammatory and antinociceptive features of Bryonia alba L.: As a possible alternative in treating rheumatism." Open Chemistry 17, no. 1 (2019): 23–30. http://dx.doi.org/10.1515/chem-2019-0003.

Full text

Abstract:

AbstractBryonia species have traditionally been used as a diuretic and laxative, to reduce edema and relieve joint pain. B. alba roots are used especially to treat rheumatic pain and applied to painful joints in Turkish folk medicine. B. alba roots were extracted with n-hexane, ethyl acetate (EtOAc), and methanol, successively. The carrageenan-induced hind paw edema model and the Whittle method were used to evaluate the anti-inflammatory activity of the extracts in mice. The p-benzoquinone-induced abdominal constriction test and tail flick test were used to evaluate the antinociceptive activity of the extracts in mice. DPPH-radical-scavenging activity, ABTS radical–scavenging activity, total antioxidant activity, and hydroxyl radical– scavenging activity were assessed. Furthermore, the total phenolic and total flavonoid contents were calculated for all the extracts. The EtOAc extract prepared from B. alba roots had the most promising anti-inflammatory, antinociceptive, and antioxidant activities. Moreover, it had high phenolic and flavonoid contents. Therefore, B. alba roots could be alternative treatment method for rheumatic disorders.

APA, Harvard, Vancouver, ISO, and other styles

12

Ovenston, C. A. "Studying Colour Appearance by the Uniform Scaling of Colour Circles." Perception 26, no. 1_suppl (1997): 302. http://dx.doi.org/10.1068/v970040.

Full text

Abstract:

Scaling experiments presented at ECVP 1996 (Ovenston and Whittle, 1996 Perception25 Supplement, 16) demonstrated the importance of the background chromaticity in setting subjective equal-interval colour scales along the L(-M)-cone and S-cone axes of Macleod - Boynton isoluminant chromaticity space. In the current experiments we also investigate colour scaling but around circles centred on different background chromaticity points. This is done in a logarithmic version of the MacLeod - Boynton diagram, which is much closer to an equal-subjective-interval diagram than the linear version. However, colour circles set with even geometrical spacing in the log diagram do not appear to have even subjective spacing. Preliminary results show that setting hue to even subjective spacing is a convenient and powerful method for studying the role of constant-cone-excitations and opponent-colour axes in determining hue.

APA, Harvard, Vancouver, ISO, and other styles

13

Bai, Weimin, Guanglong Xu, Mingyue Tan, et al. "Diffusivities and Atomic Mobilities in bcc Ti-Mo-Zr Alloys." Materials 11, no. 10 (2018): 1909. http://dx.doi.org/10.3390/ma11101909.

Full text

Abstract:

β-type (with bcc structure) titanium alloys have been widely used as artificial implants in the medical field due to their favorable properties. Among them, Ti-Mo alloy attracted numerous interests as metallic biomaterials. Understanding of kinetic characteristics of Ti alloys is critical to understand and manipulate the phase transformation and microstructure evolution during homogenization and precipitation. In this work, diffusion couple technique was employed to investigate the diffusion behaviors in bcc Ti-Mo-Zr alloys. The diffusion couples were prepared and annealed at 1373 K for 72 h and 1473 K for 48 h, respectively. The composition-distance profiles were obtained via electron probe micro-analysis (EPMA). The chemical diffusion coefficients and impurity diffusion coefficients were extracted via the Whittle-Green method and Hall method. The obtained diffusion coefficients were assessed to develop a self-consistent atomic mobility database of bcc phase in Ti-Mo-Zr system. The calculated diffusion coefficients were compared with the experimental results. They showed good agreement. Simulations were implemented by Dictra Module in Thermo-Calc software. The predicted composition-distance profiles, inter-diffusion flux, and diffusion paths are consistent with experimental data, confirming the accuracy of the database.

APA, Harvard, Vancouver, ISO, and other styles

14

Steinbock, Eliza. "The wavering line of foreground and background: a proposal for the schematic analysis of trans visual culture." Journal of Visual Culture 19, no. 2 (2020): 171–83. http://dx.doi.org/10.1177/1470412920944480.

Full text

Abstract:

This article endeavors to describe the impact of ‘visual essentialism’ as an approach towards trans visual culture, including the violence it enacts and the mistrust it fosters towards self-defining language for gender identities. It borrows Susan Stryker’s insight in her introduction to her Transgender Studies Reader (2006, edited with Stephen Whittle) that trans phenomena move to the foreground when set against an ambient background consisting of gender normative conditions. It extrapolates this visual metaphor for understanding trans in contrast to non-trans into a method to analyze trans visual culture. The author argues that, by focusing on how the figure and ground relate in alignment, or not, the analyst can better examine how the components of visuality are working together to position one’s value-laden perspective on visible transgender and non/trans things. This elaboration along three proposed categories of value, namely political, symbolic and commercial, is offered to better understand and parse the noted problem of trans visibility increasing alongside transphobic violence.

APA, Harvard, Vancouver, ISO, and other styles

15

Hidalgo, J., and Y. Yajima. "PREDICTION AND SIGNAL EXTRACTION OF STRONGLY DEPENDENT PROCESSES IN THE FREQUENCY DOMAIN." Econometric Theory 18, no. 3 (2002): 584–624. http://dx.doi.org/10.1017/s0266466602183022.

Full text

Abstract:

We frequently observe that one of the aims of time series analysts is to predict future values of the data. For weakly dependent data, when the model is known up to a finite set of parameters, its statistical properties are well documented and exhaustively examined. However, if the model was misspecified, the predictors would no longer be correct. Motivated by this observation and because of the interest in obtaining adequate and reliable predictors, Bhansali (1974, Journal of the Royal Statistical Society, Series B 36, 61–73) examined the properties of a nonparametric predictor based on the canonical factorization of the spectral density function given in Whittle (1963, Prediction and Regulation by Linear Least Squares) and known as FLES.However, the preceding work does not cover the so-called strongly dependent data. Because of the interest in this type of processes, one of our objectives in this paper is to examine the properties of the FLES for these processes. In addition, we illustrate how the FLES can be adapted to recover the signal of a strongly dependent process, showing its consistency. The proposed method is semiparametric in the sense that, in contrast to other methods, we do not need to assume any particular model for the noise except that it is weakly dependent.

APA, Harvard, Vancouver, ISO, and other styles

16

Branigan, Keith, Kevin J. Edwards, and Colin Merrony. "Bronze Age fuel: the oldest direct evidence for deep peat cutting and stack construction?" Antiquity 76, no. 293 (2002): 849–55. http://dx.doi.org/10.1017/s0003598x0009133x.

Full text

Abstract:

IntroductionPeat has been used as a fuel and as an additive to arable fields to aid fertility since prehistoric times in many parts of northern Europe (e.g. Fenton 1986; Whittle et al. 1986). The cutting of deep peat and the construction of peat stacks as part of the drying process has been documented from Medieval times, but the antiquity of such activities is unknown. Peat stacks are ephemeral structures whose purpose is to aid the drying of hard-won, wet peat in areas where other fuels such as wood and coal are expensive or unobtainable. They are typically cleared within a few months of construction and leave no traces of their former presence. Here we report the unprecedented discovery of a ‘fossil’ pyramidal peat stack dating to the 2nd millennium BC, from the Isle of Barra in the Outer Hebrides of Scotland. Individual turves contained finger and thumb impressions and pollen analysis reveals environmental conditions at around the time of cutting. The method of extracting and stacking the peat used some 3500 years ago may be similar to that used today.

APA, Harvard, Vancouver, ISO, and other styles

17

Tang, Shuhan, Peter F. Craigmile, and Yunzhang Zhu. "Spectral Estimation Using Multitaper Whittle Methods With a Lasso Penalty." IEEE Transactions on Signal Processing 67, no. 19 (2019): 4992–5003. http://dx.doi.org/10.1109/tsp.2019.2932879.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Dehghani, H., and M. Ataee-Pour. "The Role of Economic Uncertainty on the Block Economic Value – a New Valuation Approach / Rola Czynnika Niepewności Przy Obliczaniu Wskaźnika Rentowności – Nowe Podejście." Archives of Mining Sciences 57, no. 4 (2012): 991–1014. http://dx.doi.org/10.2478/v10267-012-0066-6.

Full text

Abstract:

Abstract The block economic value (BEV) is one of the most important parameters in mine evaluation. This parameter can affect significant factors such as mining sequence, final pit limit and net present value. Nowadays, the aim of open pit mine planning is to define optimum pit limits and an optimum life of mine production scheduling that maximizes the pit value under some technical and operational constraints. Therefore, it is necessary to calculate the block economic value at the first stage of the mine planning process, correctly. Unrealistic block economic value estimation may cause the mining project managers to make the wrong decision and thus may impose inexpiable losses to the project. The effective parameters such as metal price, operating cost, grade and so forth are always assumed certain in the conventional methods of BEV calculation. While, obviously, these parameters have uncertain nature. Therefore, usually, the conventional methods results are far from reality. In order to solve this problem, a new technique is used base on an invented binomial tree which is developed in this research. This method can calculate the BEV and project NPV under economic uncertainty. In this paper, the BEV and project NPV were initially determined using Whittle formula based on certain economic parameters and a multivariate binomial tree based on the economic uncertainties such as the metal price and cost uncertainties. Finally the results were compared. It is concluded that applying the metal price and cost uncertainties causes the calculated block economic value and net present value to be more realistic than certain conditions.

APA, Harvard, Vancouver, ISO, and other styles

19

Brown, Richard D., Johnathan M. Bardsley, and Tiangang Cui. "Semivariogram methods for modeling Whittle–Matérn priors in Bayesian inverse problems." Inverse Problems 36, no. 5 (2020): 055006. http://dx.doi.org/10.1088/1361-6420/ab762e.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Ergene Öz, Burçin, Mert Ilhan, Serkan Ozbilgin, et al. "Effects of Alchemilla mollis and Alchemilla persica on the wound healing process." Bangladesh Journal of Pharmacology 11, no. 3 (2016): 577. http://dx.doi.org/10.3329/bjp.v11i3.26024.

Full text

Abstract:

<p class="Abstract"><em>Alchemilla mollis</em>, is used in traditional medicine for the treatment of wounds and excessive menstruation. Aqueous methanol extracts of<em> A. mollis</em> and <em>A. persica</em> were evaluated for wound healing acivity by using linear incision and circular excision wound models along with hydroxyproline estimation and histopathological analysis. Anti-inflammatory effect was determined according to Whittle method. The extracts prepared from the aerial parts of <em>A. mollis</em> and <em>A. persica</em> exerted significant wound healing activity with the tensile strength values of 39.3% and 33.3%, respectively, and with the contraction values of 51.4% and 43.5%, respectively. Hydroxyproline estimation and histopathological analysis also confirmed the results. The extracts of <em>A. mollis</em> and <em>A. persica</em> showed significant anti-inflammatory activity with the values of 30.6% and 26.6% respectively. These results showed that <em>A. mollis</em> and <em>A. persica</em> possess significant wound healing and anti-inflammatory activities.</p><p class="Abstract"><strong>Video Clip</strong></p><p class="Subheading"><a href="https://youtube.com/v/k2Hz7f1e4SI">Circular excision wound model</a>: 2 min</p><p> </p>

APA, Harvard, Vancouver, ISO, and other styles

21

Du Hailong, 杜海龙, 段照斌 Duan Zhaobin та 孙晓东 Sun Xiaodong. "基于Fourier频谱分析的白光干涉信号解算方法". Laser & Optoelectronics Progress 58, № 9 (2021): 0907001. http://dx.doi.org/10.3788/lop202158.0907001.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Zeng, Yuehua, Keiiti Aki, and Ta-Liang Teng. "Source inversion of the 1987 Whittier Narrows earthquake, California, using the isochron method." Bulletin of the Seismological Society of America 83, no. 2 (1993): 358–77. http://dx.doi.org/10.1785/bssa0830020358.

Full text

Abstract:

Abstract We determine the earthquake source process from an isochron synthetic method and the recursive stochastic inverse algorithm. Using the strong-motion records from 16 stations within 15 km of the epicenter, we determined the earthquake slip and rupture time distribution on the fault with different fault geometries for the Whittier Narrows earthquake. In our study, we have chosen two best-fit fault geometries, with strike direction and dip angle of 270° and 35°, and 280° and 30°, respectively. The inversion results indicated dominantly two regions of slip on the fault plane for the Whittier Narrows mainshock, one located immediately below the hypocenter and the other near the lower east corner of the fault. In addition, there are three or four other smaller localized source areas near the hypocenter. Together, they indicate a highly heterogeneous fault slip distribution for the Whittier Narrows mainshock. The great majority of seismic moment release occurs in a 10 by 4 km region, which is consistent with the geodetic modeling results. The inversion result for the model allowing variable slip and rupture time model gave the best fit in terms of both the Euclidean norm and the weighted Euclidean norm, suggesting that the rupture velocity may be not constant. But we find no simple causal relation between these rupture velocity variations and the slip amplitude distributions. On the other hand, by comparing the mainshock slip pattern of our inversion results with the early aftershock, we found that the aftershocks tend to occur over patches on the rupture surface deficient in mainshock slip. This observation can be well explained by the barrier model of fault heterogeneity.

APA, Harvard, Vancouver, ISO, and other styles

23

Cox, Sonja G., and Kristin Kirchner. "Regularity and convergence analysis in Sobolev and Hölder spaces for generalized Whittle–Matérn fields." Numerische Mathematik 146, no. 4 (2020): 819–73. http://dx.doi.org/10.1007/s00211-020-01151-x.

Full text

Abstract:

AbstractWe analyze several types of Galerkin approximations of a Gaussian random field $$\mathscr {Z}:\mathscr {D}\times \varOmega \rightarrow \mathbb {R}$$ Z : D × Ω → R indexed by a Euclidean domain $$\mathscr {D}\subset \mathbb {R}^d$$ D ⊂ R d whose covariance structure is determined by a negative fractional power $$L^{-2\beta }$$ L - 2 β of a second-order elliptic differential operator $$L:= -\nabla \cdot (A\nabla ) + \kappa ^2$$ L : = - ∇ · ( A ∇ ) + κ 2 . Under minimal assumptions on the domain $$\mathscr {D}$$ D , the coefficients $$A:\mathscr {D}\rightarrow \mathbb {R}^{d\times d}$$ A : D → R d × d , $$\kappa :\mathscr {D}\rightarrow \mathbb {R}$$ κ : D → R , and the fractional exponent $$\beta >0$$ β > 0 , we prove convergence in $$L_q(\varOmega ; H^\sigma (\mathscr {D}))$$ L q ( Ω ; H σ ( D ) ) and in $$L_q(\varOmega ; C^\delta (\overline{\mathscr {D}}))$$ L q ( Ω ; C δ ( D ¯ ) ) at (essentially) optimal rates for (1) spectral Galerkin methods and (2) finite element approximations. Specifically, our analysis is solely based on $$H^{1+\alpha }(\mathscr {D})$$ H 1 + α ( D ) -regularity of the differential operator L, where $$0<\alpha \le 1$$ 0 < α ≤ 1 . For this setting, we furthermore provide rigorous estimates for the error in the covariance function of these approximations in $$L_{\infty }(\mathscr {D}\times \mathscr {D})$$ L ∞ ( D × D ) and in the mixed Sobolev space $$H^{\sigma ,\sigma }(\mathscr {D}\times \mathscr {D})$$ H σ , σ ( D × D ) , showing convergence which is more than twice as fast compared to the corresponding $$L_q(\varOmega ; H^\sigma (\mathscr {D}))$$ L q ( Ω ; H σ ( D ) ) -rate. We perform several numerical experiments which validate our theoretical results for (a) the original Whittle–Matérn class, where $$A\equiv \mathrm {Id}_{\mathbb {R}^d}$$ A ≡ Id R d and $$\kappa \equiv {\text {const.}}$$ κ ≡ const. , and (b) an example of anisotropic, non-stationary Gaussian random fields in $$d=2$$ d = 2 dimensions, where $$A:\mathscr {D}\rightarrow \mathbb {R}^{2\times 2}$$ A : D → R 2 × 2 and $$\kappa :\mathscr {D}\rightarrow \mathbb {R}$$ κ : D → R are spatially varying.

APA, Harvard, Vancouver, ISO, and other styles

24

Aoki, Shigeru, Tadashi Nishimura, and Tetsumaro Hiroi. "OS04W0014 Analytical method for reduction of residual stress of welded joint using filtered white noise." Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2003.2 (2003): _OS04W0014. http://dx.doi.org/10.1299/jsmeatem.2003.2._os04w0014.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Shibano, J., K. Kajiwara, K. Fukuda, M. Eguchi, A. Shiro, and T. Shobu. "OS3-6 Evaluation of Ductile Damage Progress of Aluminum Single Crystal under Tensile Loading by Using Synchrotron White X-ray(Microstructure and damage evaluation,OS3 Stress/strain analyses by diffraction method,MEASUREMENT METHODS)." Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2015.14 (2015): 40. http://dx.doi.org/10.1299/jsmeatem.2015.14.40.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

del Castillo Collazo, Nelson, Luis Felipe Alvarado Pegueros, Víctor Flores Rodríguez, and Noé Amir Rodríguez. "Estudio de las preferencias para el vino blanco y el vino tinto utilizando métodos de clasificación binaria." Revista de Investigación en Tecnologías de la Información 8, no. 16 (2020): 23–32. http://dx.doi.org/10.36825/riti.08.16.003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Khmil, D. N. "Method for determination of the absorption coefficient in films based on photoluminophore suspension for white LEDs." Semiconductor Physics Quantum Electronics and Optoelectronics 18, no. 2 (2015): 215–19. http://dx.doi.org/10.15407/spqeo18.02.215.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Fan, Ying, Asli Odabasi, Charles A. Sims, Keith R. Schneider, Zhifeng Gao, and Paul J. Sarnoski. "Determination of aquacultured whiteleg shrimp ( Litopanaeus vannemei ) quality using a sensory method with chemical standard references." Journal of the Science of Food and Agriculture 101, no. 12 (2021): 5236–44. http://dx.doi.org/10.1002/jsfa.11172.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Paniagua Chávez, Carmen Guadalupe. "A simple method for short-term storage and transportation of spermatophores of Pacific white shrimp (Litopenaeus vannamei )." Hidrobiológica 26, no. 1 (2016): 9–14. http://dx.doi.org/10.24275/uam/izt/dcbs/hidro/2016v26n1/paniagua.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

E, Nasambaev. "Assessment of the Breeding Qualities of Kazakh White-headed Calves Using the Method of Testing Own Productivity." Journal of Advanced Research in Dynamical and Control Systems 12, SP7 (2020): 476–81. http://dx.doi.org/10.5373/jardcs/v12sp7/20202130.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Jingjing Zhang, Jingjing Zhang, Tao Zhang Tao Zhang, Shishen Liu Shishen Liu, Shidong Yuan Shidong Yuan, Yafang Jin Yafang Jin, and Sheng Yang Sheng Yang. "Feasibility analysis of junction temperature measurement for GaN-based high-power white LEDs by the peak-shift method." Chinese Optics Letters 11, no. 9 (2013): 091204–91206. http://dx.doi.org/10.3788/col201311.091204.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Krivoshey, N. S., and V. G. Kobak. "Study on modified Whitley model with different number and various methods of forming elite individuals." Vestnik of Don State Technical University 18, no. 2 (2018): 223–29. http://dx.doi.org/10.23947/1992-5980-2018-18-2-223-229.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Borisov, R. R., I. N. Nikonova, A. V. Parshin-Chudin, and N. P. Kovacheva. "Evaluation effectiveness of methods for regulating the coloring of whiteleg shrimp Penaeus vannamei in aquaculture." Trudy VNIRO 183 (2021): 87–95. http://dx.doi.org/10.36038/2307-3497-2021-183-87-95.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Cervellione, F., C. McGurk, P. Silva, M. A. G. Owen, and W. Van den Broeck. "Optimization of fixation methods for image analysis of the hepatopancreas in whiteleg shrimp,Penaeus vannamei(Boone)." Journal of Fish Diseases 40, no. 4 (2016): 517–27. http://dx.doi.org/10.1111/jfd.12531.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Perez-Enriquez, Ricardo, Raul Llera-Herrera, Pavel Galindo Torres, and Susana Avila. "A fast sex detection method for the Whiteleg shrimp Litopenaeus vannamei by post-PCR high resolution melting (HRM)." Aquaculture 520 (April 2020): 734784. http://dx.doi.org/10.1016/j.aquaculture.2019.734784.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Jones, B. G., and C. N. Nicolaides. "The Whittier Narrows, California Earthquake of October 1, 1987—Buildings at Risk." Earthquake Spectra 4, no. 1 (1988): 35–42. http://dx.doi.org/10.1193/1.1585463.

Full text

Abstract:

Current methods of risk assessment require determining the incidence of damage to the elements at risk in order to establish vulnerability. Recent disasters can provide extremely useful information for calibrating various parameters of damage rates. It is necessary to produce estimates of the elements at risk and apply the best information available concerning damage. This requires considering the total physical context in which the disaster occurred. We estimate population, number of buildings, building floor area, and building replacement cost for the Modified Mercalli Intensity VI, VII and VIII areas for the Whittier Narrows Earthquake and calculate incidence rates.

APA, Harvard, Vancouver, ISO, and other styles

37

Van Nyen, Pieter L. M., Henny P. G. Van Ooijen, and J. Will M. Bertrand. "Simulation results on the performance of Albin and Whitt's estimation method for waiting times in integrated production–inventory systems." International Journal of Production Economics 90, no. 2 (2004): 237–49. http://dx.doi.org/10.1016/s0925-5273(03)00178-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Lusiana, Evellin Dewi, Muhammad Musa, Mohammad Mahmudi, Sulastri Arsad, and Nanik Retno Buwono. "SUSTAINABILITY ANALYSIS OF WHITELEG SHRIMP POND AQUACULTURE AT JATIRENGGO VILLAGE, LAMONGAN REGENCY." Jurnal Ekonomi Pembangunan 16, no. 2 (2018): 95. http://dx.doi.org/10.22219/jep.v16i2.8215.

Full text

Abstract:

Whiteleg shrimp (Litopenaeus vannamei) is a fisheries commodity which has high economic value because of its high demand and easier cultivation. Lamongan regency is one of the minapolitan region in East Java Province, especially at Glagah district, Jatirenggo village which becomes the minapolist, with one of the superior commodities is whiteleg shrimp. The development of a certain village can be determined by village developing index or IDM which consists of three categories, they are left behind, developing, and advance village. Jatirenggo village has a village developing index (IDM) of 0.6080 which classified as developing category or category 2. Thus, in order to increase its status, the welfare of its people need to be considered. Whiteleg shrimp pond aquaculture can be one of the effort to increase the income of Jatirenggo’s. This study aims to analyze the sustainability of whiteleg shrimp aquaculture activity in Jatirenggo village according to ecology, socio-economic, technology-infrastructure, and institutional dimension. The used method was MDS Rapfish. The results showed that the whiteleg shrimp aquaculture in Jatirenggo village is classified as sustainable, or it means the situation in Jatirenggo village is suitable for a successful aquaculture. Thus, it can be expected to increase the income of the farmers.

APA, Harvard, Vancouver, ISO, and other styles

39

Lusiana, Evellin Dewi, Muhammad Musa, Mohammad Mahmudi, Sulastri Arsad, and Nanik Retno Buwono. "SUSTAINABILITY ANALYSIS OF WHITELEG SHRIMP POND AQUACULTURE AT JATIRENGGO VILLAGE, LAMONGAN REGENCY." Jurnal Ekonomi Pembangunan 16, no. 2 (2018): 95. http://dx.doi.org/10.22219/jep.v16i2.8225.

Full text

Abstract:

Whiteleg shrimp (Litopenaeus vannamei) is a fisheries commodity which has high economic value because of its high demand and easier cultivation. Lamongan regency is one of the minapolitan region in East Java Province, especially at Glagah district, Jatirenggo village which becomes the minapolist, with one of the superior commodities is whiteleg shrimp. The development of a certain village can be determined by village developing index or IDM which consists of three categories, they are left behind, developing, and advance village. Jatirenggo village has a village developing index (IDM) of 0.6080 which classified as developing category or category 2. Thus, in order to increase its status, the welfare of its people need to be considered. Whiteleg shrimp pond aquaculture can be one of the effort to increase the income of Jatirenggo’s. This study aims to analyze the sustainability of whiteleg shrimp aquaculture activity in Jatirenggo village according to ecology, socio-economic, technology-infrastructure, and institutional dimension. The used method was MDS Rapfish. The results showed that the whiteleg shrimp aquaculture in Jatirenggo village is classified as sustainable, or it means the situation in Jatirenggo village is suitable for a successful aquaculture. Thus, it can be expected to increase the income of the farmers.

APA, Harvard, Vancouver, ISO, and other styles

40

Lusiana, Evellin Dewi, Muhammad Musa, Mohammad Mahmudi, Sulastri Arsad, and Nanik Retno Buwono. "SUSTAINABILITY ANALYSIS OF WHITELEG SHRIMP POND AQUACULTURE AT JATIRENGGO VILLAGE, LAMONGAN REGENCY." Jurnal Ekonomi Pembangunan 16, no. 2 (2018): 93. http://dx.doi.org/10.22219/jep.v16i2.9054.

Full text

Abstract:

Whiteleg shrimp (Litopenaeus vannamei) is a fisheries commodity which has high economic value because of its high demand and easier cultivation. Lamongan regency is one of the minapolitan region in East Java Province, especially at Glagah district, Jatirenggo village which becomes the minapolist, with one of the superior commodities is whiteleg shrimp. The development of a certain village can be determined by village developing index or IDM which consists of three categories, they are left behind, developing, and advance village. Jatirenggo village has a village developing index (IDM) of 0.6080 which classified as developing category or category 2. Thus, in order to increase its status, the welfare of its people need to be considered. Whiteleg shrimp pond aquaculture can be one of the effort to increase the income of Jatirenggo’s. This study aims to analyze the sustainability of whiteleg shrimp aquaculture activity in Jatirenggo village according to ecology, socio-economic, technology-infrastructure, and institutional dimension. The used method was MDS Rapfish. The results showed that the whiteleg shrimp aquaculture in Jatirenggo village is classified as sustainable, or it means the situation in Jatirenggo village is suitable for a successful aquaculture. Thus, it can be expected to increase the income of the farmers.

APA, Harvard, Vancouver, ISO, and other styles

41

Nakonechna, O. A., A. I, Bezrodna, E. M. Kornienko, et al. "The Fluorescent Probe Method in Investigation of the State of Erythrocyte Membranes in White Rats at Exposure to Chemical Environmental Factors." Ukraïnsʹkij žurnal medicini, bìologìï ta sportu 3, no. 6 (2018): 299–303. http://dx.doi.org/10.26693/jmbs03.06.299.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Jamalan, Shadi, and Farshad Rashidinejad. "RETRACTED: Compare Methods of Fix Lead, Milawa NPV and Milawa Balance Algorithm in Optimizing the Production of Open Pit Mines with Whittel Software." Open Journal of Geology 07, no. 05 (2017): 603–7. http://dx.doi.org/10.4236/ojg.2017.75041.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Olkowicz, Klaudia, Zofia Buczko, and Piotr Tomassi. "Formation of white oxide coatings on aluminum using electrochemical method." Inżynieria Powierzchni 24, no. 3 (2019): 10–16. http://dx.doi.org/10.5604/01.3001.0013.5779.

Full text

Abstract:

The possibility of obtaining white oxide coatings on aluminum was investigated. Until now, an industrial method of producing white and opaque oxide coatings on aluminum by electrochemical method has not been worked out. In some industries there is a need for a white surface finish of aluminum products. Two methods of obtaining white coatings and three sealing methods have been tested during the work. The quality of coatings has been tested according to standard QUALANOD tests, decorative values were additionally evaluated. The obtained coatings have been compared with transparent oxide coatings on aluminum, which have been obtained by conventional methods.

APA, Harvard, Vancouver, ISO, and other styles

44

Wald, D., P. G. Somerville, and L. J. Burdick. "The Whittier Narrows, California Earthquake of October 1, 1987—Simulation of Recorded Accelerations." Earthquake Spectra 4, no. 1 (1988): 139–56. http://dx.doi.org/10.1193/1.1585469.

Full text

Abstract:

We have simulated accelerograms from many of the strong motion stations close to the mainshock of the 1987 Whittier Narrows earthquake using a semi-empirical Green's function summation technique. This method allows gross aspects of the source rupture process to be treated deterministically using a kinematic model based on first motion studies, teleseismic modeling and the distribution of aftershocks. Stochastic aspects of the rupture process are then included to simulate irregularity in both rupture and slip velocity. Gross aspects of wave propagation are modeled using theoretical Green's functions calculated with generalized rays. Detailed aspects of the source radiation at high frequencies, as well as unmodeled propagational aspects such as scattering, are included empirically by using multiple recordings of a smaller Imperial Valley earthquake as empirical source functions. Our main objective is to see how well we can predict the peak ground accelerations, time histories and response spectra of ground motions of a moderate sized earthquake within the Los Angeles Basin having limited detailed source information. We find that the simulations predict the observations accurately enough to identify which phases and amplitudes in the observed data may be due to local site response rather than source or radiation effects. Comparisons between observed and simulated accelerograms for all the stations modeled are made using peak ground acceleration, and using time histories and response spectra for the stations that have been hand-digitized to date. The Bright Avenue Whittier station has the largest simulated peak acceleration, in agreement with the recorded peak acceleration data.

APA, Harvard, Vancouver, ISO, and other styles

45

Xu, Li Li, and Bao Xian Jia. "Automatic White Balance Based on Gray World Method and Retinex." Applied Mechanics and Materials 462-463 (November 2013): 837–40. http://dx.doi.org/10.4028/www.scientific.net/amm.462-463.837.

Full text

Abstract:

In different illumination, the same scene has different images. These images have different color. While adjust the image color, white balance is a very critical step. In the color adjustment, effective and automatic white balance algorithm can realize the intelligent adjustment of image color and save time. There are two kinds balance methods are Gray world method and Retinex theory. Two methods are commonly used. These have different treatment goals and have different characteristics. And their applications are relate to image attribute. Therefore, the two methods are combined and improve the white balance effect. In this paper, image was processed with gray world method firstly. Using the color constancy of Retinex, we maintain the green channel. We use nonlinear methods to adjust the pixel intensity. Through different parameters, we change the R, G, B channel value and realize the non linear adjustment of image intensity. The experimental results show that the proposed automatic white balance method can effectively avoid image distortion and keep the white balance is better.

APA, Harvard, Vancouver, ISO, and other styles

46

Fourooghifard, Hojjatollah, Abbas Matinfar, Mohammad Seddiq Mortazavi, Kiuomars Roohani Ghadikolaee, and Maryam Mirbakhsh. "Growth parameters of whiteleg shrimp Litopenaeus vannamei and red seaweed Gracilaria corticata in integrated culturing method under zero water exchange system." Aquaculture Research 48, no. 10 (2017): 5235–42. http://dx.doi.org/10.1111/are.13335.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Thanh, Tran Trung, Nathan Bott, Le Hoang Duc, Dang Thi Hoang Oanh, Nguyen Trung Nam, and Chu Hoang Ha. "Comparison of bacterial community structures in digestive tract between healthy and disease whiteleg shrimp (Litopenaeus vannamei) in Soc Trang, Vietnam." Vietnam Journal of Biotechnology 16, no. 3 (2018): 543–51. http://dx.doi.org/10.15625/1811-4989/16/3/13086.

Full text

Abstract:

Gut bacteria comprise a complex bacterial community related to many functions in a host. The stability of gut bacteria plays important models in the health and immunology of a host. Many studies on intestine bacteria constructed via cultivation and Denaturation Gradient Gel Electrophoresis (DDGE) methods have proved a limited efficiency. In order to tackle these drawbacks, the next generation sequencing method was developed on 16S-rRNA-based sequences (Metabarcoding). The composition of bacterial communities was revealed based on the analysis of 16S rRNA sequences of intestine bacteria in Litopenaeus vannamei ponds in comparison with microbial communities in a Penaeus monodon pond and a muscle of shrimp. These results showed that the dominant phyla of intestine bacteria in Litopenaeus vannamei were Proteobacteria (49.3–57.4%), Firmicutes (15.6–34.4%) and Bacteroidetes (0.1–16.9%). Rhizobium(0.4%-26.1%), Vibrio(0–23.9%) and Spongiimonas(0–16,7%) were dominant genera in Litopenaeus vannamei gut. A higher proportion of Fusobacterium (10%), a shrimp pathogen group, was found in a disease shrimp pond (ST4) in comparison with a low growth shrimp pond (ST3) (0%) and a healthy shrimp pond (ST1) (0.6%). Vibrio was marked as shrimp pathogen genus accounted for 22.3% of total genera in ST4 in comparison with 2.4% in ST3 and 3.5% in ST1. Interestingly, a higher percentage of Vibrio rotiferianus (7.98%) was found in ST4 compared to ST3 (1%) and ST1 (0%). Fusobacterium and Vibrio will be the objects for the next experiments to discover shrimp pathogens specifically.

APA, Harvard, Vancouver, ISO, and other styles

48

Adi, Annis Catur, Mahmud Aditya Rifqi, Merryana Adriani, Farapti Farapti, Nila Reswari Haryana, and Junaida Astina. "EFFECT OF COOKING METHODS AND RICE VARIETY ON THE SENSORY QUALITY AND CONSUMER ACCEPTANCE." Media Gizi Indonesia 15, no. 3 (2020): 159. http://dx.doi.org/10.20473/mgi.v15i3.159-166.

Full text

Abstract:

Rice is the staple food of Indonesian which has superior taste which made it rooted in the eating culture in Indonesia. Nowadays, there is still limited research comparing cooking methods in various rice varieties. This study aim to analyze the eff ect of various cooking methods and rice variety on sensory quality. There were two cooking methods tested, traditional method that combines boiling and steaming, and rice cooker steaming method. Sensory test (quality characteristic) and acceptance test were measured using hedonic scale on 30 semi-trained panelist to evaluate the eff ect of cooking method on four rice variety, that are white rice Berlian Sae, white rice Super Slyp, brown rice, and black rice. Statistical test used was ANOVA and continued with Duncan test. Results showed diff erences in ratio of water and cooking time of various types of rice with diff erent methods. White rice (Slyp Super) with conventional cooking methods was more acceptable to panelist with the characteristics of bright colors, smell, neutral taste, and delicate texture. There was a signifi cant diff erence in panelist acceptance based on type of rice (p<0.05) which brown rice and black rice had lower acceptability than white rice. There was no signifi cant diff erence in acceptance by cooking method (p>0.05), but there was a tendency that traditional method has higher acceptability. Color indicator became main indicator for panelist determined overall acceptability, so that it can be considered in the development of rice cooking methods.

APA, Harvard, Vancouver, ISO, and other styles

49

Špička, J. "Farming under environmental restrictions in the Beskyds and White Carpathians." Agricultural Economics (Zemědělská ekonomika) 55, No. 9 (2009): 459–66. http://dx.doi.org/10.17221/2405-agricecon.

Full text

Abstract:

The paper presents the results of research aimed at the analysis of the viability of agricultural enterprises which farm in less favoured areas and under the environmental restrictions pertaining to protected landscape areas. The target objects of the research were farmers taking care of mountain grasslands (meadows and grazing lands) in two protected landscape areas of the Czech Republic – the Beskyds and White Carpathians. The results are based on the sample survey carried out in 2006 and 2007. The first stage of the survey was devoted to the quality of life and business of farmers. The second stage of the survey concerned the financial condition of the farming businesses. Two statistical methods (analysis of variance, logistic regression) and the financial analysis method were used as analytic tools. The agricultural enterprises farming under environmental restrictions perceive their farming activities as a deal and mission. Farmers also accept restrictions while using the current subsidies. Compared to the farms outside the protected landscape areas, the farms in both protected land areas showed a higher profitability but a lower business activity. The analysis found out that the adverse age structure of farmers is a very important risk factor for rural development.

APA, Harvard, Vancouver, ISO, and other styles

50

Lim, Dong Kyu, Nguyen Phuoc Long, Changyeun Mo, Ziyuan Dong, Jongguk Lim, and Sung Won Kwon. "Optimized Mass Spectrometry-Based Metabolite Extraction and Analysis for the Geographical Discrimination of White Rice (Oryza sativa L.): A Method Comparison Study." Journal of AOAC INTERNATIONAL 101, no. 2 (2018): 498–506. http://dx.doi.org/10.5740/jaoacint.17-0158.

Full text

Abstract:

Abstract In this study, we examined the effects of different extraction methods for the GC-MS- and LC-MS-based metabolite profiling of white rice (Oryza sativa L.). In addition, the metabolite divergence of white rice cultivated in either Korea or China was also evaluated. The discrimination analysis of each extraction method for white rice from Korea and China and the corresponding discriminatory markers were estimated by unpaired t-test, principal component analysis, k-means cluster analysis, partial least-squares discriminant analysis (PLS-DA), and random forest (RF). According to the prediction parameters obtained from PLS-DA and RF classifiers as well as features that could be identified, the extraction method using 75% isopropanol heated at 100°C coupled with LC-MS analysis was confirmed to be superior to the other extraction methods. Noticeably, lysophospholipid concentrations were significantly different in white rice between Korea and China, and they are novel markers for geographical discrimination. In conclusion, our study suggests an optimized extraction and analysis method as well as novel markers for the geographical discrimination of white rice.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!