bluuebunny/crossref_metadata_2025 huggingface dataset:
Riesz potential in the local Morrey–Lorentz spaces and some applications
Authors: Guliyev Vagif S. , Kucukaslan Abdulhamit , Aykol Canay , Serbetci Ayhan
Published: October 2018

In this paper, the necessary and sufficient conditions are found for the boundedness of the Riesz potential

I
α

{I_{\alpha}}

in the local Morrey–Lorentz spaces

M

p
,
q
;
λ

loc

⁢

(

ℝ
n

)

{M_{p,q;{\lambda}}^{\mathrm{loc}}({\mathbb{R}^{n}})}

. This result is applied to the boundedness of particular operators such as the fractional maximal operator, fractional Marcinkiewicz operator and fractional powers of some analytic semigroups on the local Morrey–Lorentz spaces

M

p
,
q
;
λ

loc

⁢

(

ℝ
n

)

{M_{p,q;{\lambda}}^{\mathrm{loc}}({\mathbb{R}^{n}})}

.
Modal Current and Cumulative Sum Based Fault Detection Approach in Transmission Lines
Authors: Jarrahi Mohammad Amin , Samet Haidar
Published: October 2018

In this paper, a simple and fast approach is suggested for fault detection in transmission lines. The proposed technique utilizes a modified cumulative sum approach for a modal current to identify faults. The modal current is derived by proper linear mixing of three-phase currents. Since different types of faults may occur in transmission lines, all three-phase currents should be considered during fault analysis. By converting three-phase currents to a modal current, the processing time is reduced and less memory is needed. In this paper, a modal current is processed instead of three-phase currents. The modified cumulative sum approach presented in this paper is capable of decreasing computational burdens on the digital relay and accelerating the fault detection procedure. The proposed fault detection technique is evaluated in four different systems. Moreover, some real recorded field data were deliberated in the efficiency assessment of the proposed method. The results denote high accuracy and quickness of the proposed approach. Furthermore, the performance of the proposed methodology is compared with some other similar methods from different aspects.
Development and Validation of CFD Models of Thermal Treatment on Milk Whey Proteins Dispersion In Batch and Continuous Process Condition
Authors: Rinaldi Massimiliano , Cordioli Matteo , Alinovi Marcello , Malavasi Matteo , Barbanti Davide , Mucchetti Germano
Published: October 2018

The objective of this study was to develop and experimentally validate CFD models of thermal treatments on whey protein dispersions both in batch and continuous conditions, considering several processing times (2 to 9.92 min), shear rates (191 to 519 s−1) and temperatures (70, 80 and 85 °C). Regarding thermo-rheological properties of WP dispersions, the viscosity peak (raising up at 66 °C) decreased as the shear rate increased. Two different CFD models were developed to simulate the thermal process: results showed a good fitting between experimental and simulated data (RMSE <1.7 °C for batch model and mean temperature difference of 0.93 °C for the continuous one). Based on the developed models, cook values of both processes were calculated and slowest heating points were exactly located; by means of these data, equations to estimate the cook value in processing conditions within experimental range were obtained, overcoming the need of experimental tests or in-silico simulations.
Finite groups with two supersoluble subgroups
Authors: Monakhov Victor S. , Trofimuk Alexander A.
Published: October 2018

Let G be a finite group. In this paper we obtain some sufficient conditions for the supersolubility of G with two
supersoluble non-conjugate subgroups H and K of prime index, not necessarily distinct. It is established that the supersoluble residual of such a group coincides with the nilpotent residual of the derived subgroup. We prove that G is supersoluble in the following cases: one of the subgroups H or K is nilpotent; the derived subgroup

G
′

{G^{\prime}}

of G is nilpotent;

|
G
:
H
|
=
q
>
r
=
|
G
:
K
|

{|G:H|=q>r=|G:K|}

and H is normal in G. Also the supersolubility of G with two non-conjugate maximal subgroups M and V is obtained in the following cases: all Sylow subgroups of M and of V are seminormal in G; all maximal subgroups of M and of V are seminormal in G.
Initial layer problem of the Boussinesq system for Rayleigh-Bénard convection with infinite Prandtl number limit
Authors: Fan Xiaoting , Wang Shu , Xu Wen-Qing , Liu Mingshuo
Published: October 2018

The main purpose of this paper is to study the initial layer problem and the infinite Prandtl number limit of Rayleigh-Bénard convection with an ill prepared initial data. We use the asymptotic expansion methods of singular perturbation theory and the two-time-scale approach to obtain an exact approximating solution and the convergence rates $O(\varepsilon^{\frac{3}{2}})$ and O(ε2).
Nonlinear elastic beam problems with the parameter near resonance
Authors: Xu Man , Ma Ruyun
Published: October 2018

In this paper, we consider the nonlinear fourth order boundary value problem of the form

$$ \begin{array}\text
\left\{ \begin{aligned}
&u^{(4)}(x)-\lambda u(x)=f(x, u(x))-h(x), \ \ x\in (0,1),\\
&u(0)=u(1)=u'(0)=u'(1)=0,\\
\end{aligned}\right.
\end{array} $$

which models a statically elastic beam with both end-points cantilevered or fixed. We show the existence of at least one or two solutions depending on the sign of λ−λ1, where λ1 is the first eigenvalue of the corresponding linear eigenvalue problem and λ is a parameter. The proof of the main result is based upon the method of lower and upper solutions and global bifurcation techniques.
On the implementation of multilevel Monte Carlo simulation of the stochastic volatility and interest rate model using multi-GPU clusters
Authors: Lay Harold A. , Colgin Zane , Reshniak Viktor , Khaliq Abdul Q. M.
Published: October 2018

We explore different methods of solving systems of stochastic differential equations by first implementing the Euler–Maruyama and Milstein methods with a Monte Carlo simulation on a CPU. The performance of the methods is significantly improved through the recently developed antithetic multilevel Monte Carlo estimator, which yields a computation complexity of

𝒪
⁢

(

ϵ

-
2

)

{\mathcal{O}(\epsilon^{-2})}

root-mean-square error and does so without the approximation of Lévy areas. Further improvements in performance are gained by moving the algorithms to a GPU - first on a single device and then on a multi-GPU cluster. Our GPU implementation of the antithetic multilevel Monte Carlo displays a major speedup in computation when compared with many commonly used approaches in the literature. While our work is focused on the simulation of the stochastic volatility and interest rate model, it is easily extendable to other stochastic systems, and it is of particular interest to those with non-diagonal, non-commutative noise.
Photonic spin Hall effect of monolayer black phosphorus in the Terahertz region
Authors: Lin Hai , Chen Binguo , Yang Songqing , Zhu Wenguo , Yu Jianhui , Guan Heyuan , Lu Huihui , Luo Yunhan , Chen Zhe
Published: October 2018

As a two-dimensional (2D) material, black phosphorus (BP) has attracted significant attention owing to exotic physical properties such as low-energy band gap, high carrier mobility, and strong in-plane anisotropy. The striking in-plane anisotropy is a promising candidate for novel light-matter interaction. Here, we investigate the photonic spin Hall effect (PSHE) on a monolayer of BP. Due to the in-plane anisotropic property of BP, the PSHE is accompanied with Goos-Hänchen and Imbert-Fedorov effects, resulting in an asymmetric spin splitting. The asymmetric spin splitting can be flexibly tuned by the angle between the incident plane and the armchair crystalline direction of BP and by the carrier density via a bias voltage. The centroid displacements of two opposite spin components of the reflected beam along directions parallel and perpendicular to the incident plane can be considered as four independent channels for information processing. The potential application in barcode-encryption is proposed and discussed. These findings provide a deeper insight into the spin-orbit interaction in 2D material and thereby facilitate the development of optoelectronic devices in the Terahertz region.
Gain lifetime characterization through time-resolved stimulated emission in a whispering-gallery mode microresonator
Authors: Liu Xiao-Fei , Lei Fuchuan , Wang Tie-Jun , Long Gui-Lu , Wang Chuan
Published: October 2018

The precise measurement of gain lifetime at a specific wavelength holds significant importance for understanding the properties of photonic devices and further improving their performances. Here, we show that the evolution of gains can be well characterized by measuring linewidth changes of an optical mode in a microresonator; this method cannot be achieved using time-resolved photoluminescence (PL) spectroscopy. We use an erbium-doped high-Q whispering-gallery microresonator to show the feasibility of this method. With the increase of time after the pump laser is turned off, the transmission spectrum of a probe signal exhibits transitions from a Lorentz peak to a dip; this indicates a decay of optical gains, and the corresponding lifetime is estimated to be 5.1 ms. Moreover, taper fiber coupling is used to increase the pump and collection efficiency. This method can be extended to other materials and nanostructures.
Microalgae based innovative animal fat and proteins replacers for application in functional baked products
Authors: Kafyra Maria-Styliani-Georgia , Papadaki Sofia , Chronis Marios , Krokida Magdalini
Published: October 2018

Animal fat and proteins, such as milk butter and eggs, are the main ingredients of baked products, and are frequently blamed for food allergies, obesity, cancer and type II diabetes. Therefore, there is an urgent need to replace these ingredients with healthier ones without degrading the organoleptic characteristics of the final product. Microalgae are a great source of protein, minerals and lipids such as omega-3 and omega-6 fatty acids, which are beneficial for human health, offering multiple health benefits such as antioxidant and anti-aging activity. In this study, Chlorella vulgaris microalgae were the selected raw material for the innovative replacers because of their high content in proteins and polyunsaturated fatty acids. The obtained microalgal oil was colour corrected and used to produce brioche-type baked products with 100% animal fat substitution. For protein recovery, the aquatic extract was freeze-dried, producing a dry protein powder that fully substituted the animal protein in the baked products. Finally, the development of bakery products with 100% replacement of both animal fat and protein was achieved. These innovative bakery products showed equal performance to the commercial ones, and even improved organoleptic characteristics according to the sensorial analysis that occurred.
Transformations in Breakthrough Research: The Emergence of Mirnas as a Research Routine in Molecular Biology
Authors: Kawalec Paweł
Published: October 2018

Of the three main areas of science studies that emerged after WWII (Kawalec, 2018), namely social studies of science, economics of knowledge and scientometrics, it was the latter that gained particular prominence in science policy around the 1990’s with the advent of New Public Management (Pollitt, Thiel, & Homburg, 2007). One of its focal areas has been identification of emerging topics in science. They are incessantly assumed to be an outcome of a simple cumulative progress of scientific knowledge (Price, 1976; Merton, 1988; Bird, 2007; Fochler, 2016). In my paper I challenge this assumption of simple cumulativity and argue that the emergence of breakthrough topics in science is preceded by a sequence of transformation phases. Using the example of “microRNA&cancer” as an emergent topic identified by a quantitative analysis of a large dataset of publications (Small et al. 2014) I demonstrate that the proposed analysis of transformation phases complements big data quantitative analyses with theoretical understanding of the dynamics mechanism and, in effect, leads to a more adequate characterization of the topic itself as well as a more precise identification of the source publications. While the proposed method uses a more complex (meso-level) unit of analysis (i.e. “research routines”) instead of citations and co-occurrence of single publications (micro-level), it integrates quantitative with qualitative analyses.
Asphalt Pavement Performance Analysis Using “Big Data” Computing Approaches
Authors: Chang Jia-Ruey
Published: October 2018

Rapid deterioration of pavements depends on both objective and subjective factors. This study investigates the relationships among six parameters—climate, traffic volume, distress, friction, longitudinal profile, and transverse profile—related to asphalt pavement performance. For this purpose, LTPP InfoPave, the largest pavement performance database provided by the Long-Term Pavement Performance (LTPP) program, is used. The LTPP InfoPave data exhibit the characteristics of five V’s (volume, velocity, variety, value, veracity) of “big data.” The correlation analyses are conducted on the basis of the LTPP program’s Specific Pavement Study-3 experiments. Analysis results for the data from 1987 to 2005 reveal that the average block cracking area and average raveling area are highly correlated with a correlation coefficient of maximum 0.85. The average mean roughness index (MRI) is correlated with the average block cracking area and the average raveling area with correlation coefficients 0.59 and 0.64, respectively. The results also indicate that smoothness and surface distress have relatively lower correlation; these results are consistent with the previously published results. In addition, for the traffic volume data from 1990 to 2014, the MRI is found to be higher at higher traffic volume, indicating rougher pavement, but this difference is statistically insignificant (correlation coefficient, 0.423). At the beginning and end of the section, traffic volume is highly correlated with friction, having correlation coefficients of 0.711 and 0.646, respectively. This study serves as a reference for the use of big data to gain an in-depth understanding of pavement performance, and engineers can continue to explore the application of the LTPP program using big data computing approaches.
A Potential Technology for Road Sinkhole Assessment: The Rolling Dynamic Deflectometer
Authors: Nam Boo Hyun , Stokoe II Kenneth H. , Cho Byoung Hooi , Kim Yong Je , Youn Heejung
Published: October 2018

In urban areas, excessive underground construction, aging of underground infrastructures (e.g., water pipe leakage), or both, can create underground cavities that ultimately lead to subsidence and sudden road sinkholes. These road collapses have often been reported in metropolitan areas around the world. A quick and accurate in situ testing method is essential to prevent human life loss and damage to civil infrastructure. This article introduces potential technology for road sinkhole assessment that can continuously assess the road subsurface condition in a nondestructive manner. The Rolling Dynamic Deflectometer (RDD) is a continuous pavement deflection profiling device that evaluates the existing structural condition of pavements. As the RDD moves along the pavement, it dynamically loads the pavement, and multiple rolling sensors simultaneously measure the induced dynamic deflection of the pavement. With a soft subgrade or subsurface voids, the RDD deflection profile clearly shows peak deflections. Three RDD case studies that demonstrate its potential as a road sinkhole assessment tool are presented: (i) delineation of stiffer subgrade conditions, softer subgrade conditions, or both, along a runway, (ii) identification of areas with poor subgrade soils, and (iii) detection of subsurface voids (or anomalies) along with ground-penetrating radar.
Методичний аспект підготовки студентів спеціальності «Дошкільна освіта» до участі в студентських олімпіадах
Authors: Lazarovуch Nadiіa
Published: October 2018

У статті проаналізовано науково-дослідну роботу студентів педагогічного факультету спеціальності “Дошкільна освіта”. Обґрунтовано основні шляхи вдосконалення змісту конкурсних завдань та ефективність участі студентів у всеукраїнській олімпіаді спеціальності. Розкрито деякі аспекти науково-дослідної роботи педагога, яка спрямована на створення системи теоретичних знань та практичних умінь, дозволяє формувати ставлення до науки як найважливішого засобу діагностики, проектування, прогнозування та удосконалення педагогічної практики.
Професійно-ціннісні орієнтації майбутніх педагогів ЗДО: моделювання навчально-виховного процесу у сучасних закладах вищої педагогічної освіти
Authors: Lysenko Oleksandra
Published: October 2018

У статті автором представлено окремі приклади концептуальної позиції, що була врахована під час розробки і реалізації експериментального етапу дослідження.

Його цілепокладали на визначення особливостей та окреслення шляхів актуалізації професійно-ціннісних орієнтацій у закладах вищої освіти.
Використання технології розвитку критичного мислення в підготовці майбутніх вихователів закладів дошкільної освіти до формування соціальної компетентності дошкільників
Authors: Prysiazhniuk Larysa
Published: October 2018

У статті актуалізується проблема підготовки майбутніх вихователів закладів дошкільної освіти до формування соціальної компетентності дітей. Дослідження презентує позицію автора щодо технологічного забезпечення процесу підготовки майбутніх вихователів до означеної діяльності в умовах оновлення змісту та підходів в системі вищої педагогічної освіти. Акцентовано увагу на необхідності впровадження інноваційних методів та технологій в освітній процес закладу вищої освіти, зокрема, технології розвитку критичного мислення, що сприяє усвідомленому засвоєнню студентами навчальної інформації, забезпечує розвиток їх педагогічного мислення, проектує професіоналізацію набутих знань і вмінь.
Виховання гуманної поведінки дітей старшого дошкільного віку в сучасному суспільстві
Authors: Kravets Nadiіa
Published: October 2018

У статті проаналізовані дослідження гуманної поведінки дітей старшого дошкільного віку; проблеми формування гуманних відносин; описано ситуації, в яких діти не тільки практично опановують різними навичками і вміннями, а й освоюють певні норми поведінки в колективі однолітків; формування гуманних якостей.

Встановлено, що для організації ефективного процесу формування гуманних відносин дошкільників важливе значення мають психологічні особливості, які охоплюють різні психічні сфери дітей старшого дошкільного віку – пізнавальну, вольову, емоційну –й  свідчать про те, що цей вік є переломним та багатим на новоутворення, які забезпечують перехід дитини до систематичного шкільного навчання.

Простежено, що поняття “гуманні почуття” тісно пов’язано з поняттям “моральні почуття”, що позначається на існуванні достатньо близьких класифікацій означених понять. Відтак, гуманність є вершиною моральності, оскільки в ній любов до всього живого поєднується з милосердям, безкорисливою допомогою людям, чесністю, добротою, миролюбністю, працьовитістю, турботою про людину, повагою її прав на самовизначення і свободу, урахуванням особистісних потреб, а також створенням комфортних умов щодо перебування в навчальному закладі та на шляху до успіху.

У статті проаналізовано особливості розвитку у дитини емоцій та почуття емпатії та виокремлено  ряд умов, що є необхідними для виховання гуманних почуттів:  підтримка позитивного емоційного стану кожної дитини; формування у дитини довільності поведінки; створення позитивного мікроклімату в середовищі її перебування; поглиблення й розширення знань та уявлень малюка про ті чи інші морально-етичні категорії; розвиток у дитини уміння диференціювати різні почуття; надання можливості дитині вправлятися в умінні “вживатися” в різні емоціогенні ситуації, не залишаючись до них байдужими.

Зроблено висновок, що формування особистості дитини, виховання у неї якостей гуманістичної спрямованості та певної моральної позиції – складний педагогічний процес, в основі якого лежить правильний, гармонійний розвиток почуттів, що тісно пов’язаний із розвитком у дітей дошкільного віку емоційного ставлення до навколишнього світу.
Вплив природи на всебічний розвиток дошкільника: стан проблеми дослідження
Authors: Lysenko Oleksandra , Svityk Liubov
Published: October 2018

У статті доведено, що навчально-виховна робота з дітьми повинна спрямовуватись на те, щоб вчити дошкільників знати, розуміти і пояснювати явища природи, їх причини, взаємозв’язки і залежності.Автором показано, щоб навчити дітей усвідомлювати зв’язки і залежності, які існують в природі, необхідно, щоб діти опановували знаннями про її явища, їх суть, причини – все в природі взаємопов’язане, і, водночас, має певне значення в житті людини.З’ясовано, що організоване таким чином навчання дітей сприяє виникненню в них інтересу до живої і неживої природи, формує прагнення до нової інформації про неї, стимулює пізнавальну діяльність.
Шляхи реалізації принципу наступності в екологічному вихованні дітей в сучасних закладах дошкільної освіти і початкових школах
Authors: Marchii-Dmytrash Tamara
Published: October 2018

У статті визначено суть поняття “екологічна культура” і шляхи реалізації принципу наступності як взаємопов’язаності змісту, методів, форм та засобів екологічного виховання з метою формування екологічно вихованої і культурної особистості. Виокремлено компоненти екологічної культури дітей дошкільного і молодшого шкільного віку. Конкретизовано, що важливим показником сформованості екологічної культури дитини 6-7 років є її екологічна вихованість. Акцентовано на педагогічних умовах екологічного виховання дошкільників. Визначено, що на формування екологічної культури дітей старшого дошкільного і молодшого шкільного віку впливають зміст, методи, форми і засоби екологічного виховання, які використовуються педагогами обох ланок.  Обґрунтовано місце ігор, творів художної літератури, моделювання екологічних ситуацій, праці у екологічному вихованні дітей та наведено приклади. Акцентовано на необхідності співпраці закладів дошкільної і початкової освіти з сім’єю.
Інновації у дошкільній освіті: умови ефективності інноваційних педагогічних процесів
Authors: Lysenko Oleksandra , Ivasyk Bohdana
Published: October 2018

У статті розглянуто поняття інновацій. Проаналізовано мету використання інноваційних технологій в освіті. Доведено їх ефективність в навчально-виховному процесі.
Формування готовності майбутніх вихователів закладів дошкільної освіти до моделювання рольової діяльності дошкільників: концептуальні підходи
Authors: Bakhmat Nataliia
Published: October 2018

Реформування системи освіти вимагає вдосконалення системи підготовки вихователів закладів дошкільної освіти, побудови освітнього процесу на внутрішній потенціал їхньої особистості з метою його вияву в життєвій і професійній сферах діяльності. Тому, однією з актуальних встановлено проблему формування готовності майбутнього фахівця у галузі дошкільної освіти до моделювання рольової діяльності дітей дошкільного віку та визначено соціально-педагогічні умови, які забезпечують формування досліджуваного новоутворення. Це орієнтація здобуття освіти у закладі вищої освіти на новий зміст вимог до професійної діяльності сучасного вихователя, побудова її моделі професійної діяльності з урахуванням сукупності теоретичних знань і відповідних компетентностей на рівні цілеспрямованості, що дозволяють педагогу здійснювати інноваційний пошук в умовах закладу, реалізації наступності зв’язків освітнього процесу здобувачів вищої освіти з їхньою майбутньою фаховою діяльністю у закладах вищої освіти.
Принципи впровадження контекстного навчання в процес підготовки майбутніх учителів початкової школи
Authors: Kilichenko Oksana
Published: October 2018

У статті визначено принципи створення освітнього середовища, яке сприяє формуванню компетентного вчителя, допомагає використання контекстного навчання у процесі підготовки фахівців початкової школи.

Контекстне навчання майбутнього вчителя початкової школи включає систему функціонування всіх компонентів педагогічного процесу, яку алгоритмізовано послідовністю певних дій, спрямованих на відтворення в процесі фахової підготовки предметного й соціального контекстів майбутньої професійної діяльності.

Реалізація контекстного навчання у професійній підготовці майбутніх учителів початкової школи здійснюється через процес дотримування принципів.

Виділяють традиційні та інноваційні принципи організації.

Актуальними є такі принципи організації підготовки майбутніх учителів початкової школи із використанням контекстного навчання: принцип науковості; принципу наступ­ності, послідовності і систематичності, принцип зв’язку навчання з життям, практичною діяльністю, принцип наочності; принцип свідомості навчання майбутніх учителів початкової школи, принцип змінності методів і прийомів організації навчального процесу, принцип обов’язковості зворотного зв’язку, принцип рефлексивної парадигми освіти, принцип поваги до особистості студентів у поєднанні з розумною вимогливістю до них.
A Review of Image-guided Approaches for Cardiac Resynchronisation Therapy
Authors: Tang Haipeng ,   School of Computing, University of Southern Mississippi, Long Beach, MS, USA, Tang Shaojie ,   School of Automation, Xi’an University of Posts and Telecommunications, Xi’an, Shaanxi, China, Zhou Weihua ,   School of Computing, University of Southern Mississippi, Long Beach, MS, USA
Published: October 2018

Cardiac resynchronisation therapy (CRT) is a standard treatment for patients with heart failure; however, the low response rate significantly reduces its cost-effectiveness. A favourable CRT response primarily depends on whether implanters can identify the optimal left ventricular (LV) lead position and accurately place the lead at the recommended site. Myocardial imaging techniques, including echocardiography, cardiac magnetic resonance imaging and nuclear imaging, have been used to assess LV myocardial viability and mechanical dyssynchrony, and deduce the optimal LV lead position. The optimal position, presented as a segment of the myocardial wall, is then overlaid with images of the coronary veins from fluoroscopy to aid navigation of the LV lead to the target venous site. Once validated by large clinical trials, these image-guided techniques for CRT lead placement may have an impact on current clinical practice.
Evolution of Force Sensing Technologies
Authors: Shah Dipen ,   Division of Cardiology, Hospital Cantonal de Genève, Switzerland
Published: October 2018

In order to improve the procedural success and long-term outcomes of catheter ablation techniques for atrial fibrillation (AF), an important unfulfilled requirement is to create durable electrophysiologically complete lesions. Measurement of contact force (CF) between the catheter tip and the target tissue can guide physicians to optimise both mapping and ablation procedures. Contact force can affect lesion size and clinical outcomes following catheter ablation of AF. Force sensing technologies have matured since their advent several years ago, and now allow the direct measurement of CF between the catheter tip and the target myocardium in real time. In order to obtain complete durable lesions, catheter tip spatial stability and stable contact force are important. Suboptimal energy delivery, lesion density/contiguity and/or excessive wall thickness of the pulmonary vein-left atrial (PV-LA) junction may result in conduction recovery at these sites. Lesion assessment tools may help predict and localise electrical weak points resulting in conduction recovery during and after ablation. There is increasing clinical evidence to show that optimal use of CF sensing during ablation can reduce acute PV re-conduction, although prospective randomised studies are desirable to confirm long-term favourable clinical outcomes. In combination with optimised lesion assessment tools, contact force sensing technology has the potential to become the standard of care for all patients undergoing AF catheter ablation.
Estimación de aptitud combinatoria de líneas endogámicas y predicción de híbridos de maíz de alta calidad de proteína, Guatemala, 1988
Authors: Soto León Nery , Fuentes Mario Roberto
Published: October 2018

Yellow grain hybrids of high quality protein can provide a comparative advantage because carotenes found in these materials are more easily taken up compared to normal hybrids. This advantage could provide added benefits within the poultry Industry. In this study, 91 possible crosses coming from 14 endogamic lines from the CIMMYT maize hybrid program were evaluated. The single crosses demonstrated superior adaptation notable in the coastal plain of Guatemala having grain yields approaching 7.0 Mg/ha along with excellent agronomic traits, decreased ear rot and uniform plant type. Superior hybrids demonstrated increased yields (average increase of I Mg/ha) versus the best natural check. Inbred parents 2, 1 and 6 demonstrated the highest values for general combinability and they were also amongst the best specific crosses. The yield levels, agronomic characteristics and the expression of stability in the modified endosperm of the single crosses that can be used as females to produce seed for double and three way crosses, suggests anew production alternative that could enhance the use of yellow grain hybrids of high protein quality in the tropical lowlands of Guatemala.
Evaluación de pentacloronitrobenceno (PCNB) en el control de la pudrición radicular cusada por Rhizoctonia solani Kuhn en frijol común (Phaseolus vulgaris L.)
Authors: Pichardo Guido Sergio
Published: October 2018

This experiment was conducted at “La Compañía”, Estación Experimental del Instituto Superior de Ciencias Agropecuarias (ISCA), which is located in the department of Carazo, Nicaragua. The trial was conducted during the months of June through September, 1987 with the following objectives: 1) To determine the appropiate rate of pentachloronitrobenzene (PCNB) for control of Rhizoctonia solani in common beans, 2) To evaluate the effect of mixing PCNB and “ Metalaxyl” on grain yield of common beans, 3) To determine yield reduction percentages caused by R. solani in common beans and 4) To select the best common bean variety in this experiment relative to the defined treatments. The results demonstrated that PCNB applied at a rate of 6.81 kg/ha was 3 % higher than the check and 12% higher than the highest rate of PCNB (11.36 kg/ha). The variety “Revolución 84” provided the highest yields compared to other entries.
Evaluación de cultivares de maíz de grano amarillo en 9 zonas productoras de Panamá
Authors: Pérez Daniel , González Andrés , De Gracia Nivaldo , Hernández Ricardo , Quiróz Eric , Camargo Ismael , Alvarado Alfonso
Published: October 2018

Maize varieties and hybrids from the Panama National l'rogram and experimental and commercial hybrids from priva te companies which distribute seed in Panama were evaluated in order to determine yield, agronomic characteristics and general adaptation. This study was conducted by the Maize Program of the Instituto de Investigacion Agropecuaria de Panama (IDIAP) at 9 different locations. From the combined analysis, significant ditTerences were found between locations, cultivars and a significant cultivar by location interaction was present, with the locations Paraiso, Las Tablas and La Honda having much higher yields. The highest grain yields for the entries evaluated were obtained with hybrid P-8812 and experimental hybrids 477x372 and 477x375 (5.09,5.06 and 4.91 t/ha respectively). All three were superior to the commercial hybrids X-3214 and XL-604. The significant interaction between cultivar and location means that some of the materials evaluated have different responses by location. The cultivares having improved stabi1ity parameters were Guarare- 8128, XL-604, P8802, TOC-890A and TOC-7428.
Efecto del calcio y azufre en el sistema de maíz-frijol en ladera ante un nivel de nitrógeno y fósforo en El Salvador 1989
Authors: Sosa M. José Heriberto , Mendoza O. Víctor M. , Ascencio Edgar Noel , Alvarado Ana Gertrudis , Bonilla Sonia , Raun William R.
Published: October 2018

Two field experiments were established in 1988 at Opico Quezaltepeque, El Salvador, on volcanic-ash derived soils to evaluate maize and bean grain yield response to applied sulfur, calcium and potasium. Also under evaluation was the effect of burning crop residues (common practice in this area) compared to zero tillage. The common system employed in this region is a maize-bean relay whereby the maize is planted in May and the beans in August. Four cycles of data were obtained at both locations (2 Maize, 2 beans). The treatments consisted of various combinations of ammonium sulfate and urea with and without sulfur, calcium and potasium. Grain yields were higher when ammonium sulfate (100 kg N/ha) was joint band applied with formula (16-20-0, 30 kg P2O5 ha) under zero tillage. When this same treatment was evaluated when residues were burned, grain yields were significantly lower. When comparing ammonium sulfate snd urea jointly applied with phosphorus a possible response to sulfur was noted on these soils. Aplications of potasium did not increase grain yields of either maize or beans. When dolomitic limestone was applied at arate of 3 tons/ha, no significant differences were found in maize grain yields, however, a significant bean yield increase was found the second year compared with the no lime treatment.
Sistema experto para diagnóstico de plagas insectiles de maíz (Zea mays L.) en Centro América
Authors: Merino Cisneros Francisco Leopoldo
Published: October 2018

An expert system was developed to diagnose maize insect pests in Central America. This system was established ta improve diagnostic procedures for insect pests and to facilitate the use of integrated pest management systems in maize. This work was based on acquired knowledge by experts in integrated pest management based at the Centro Agronómico Tropical de Investigación y Enseñanza (CATIE). A shell expert system specific for diagnostics was used. This expert system is capable of diagnosing 52 maize insects usingsix inference modules. Criterion used were: plant phenology, damaged organ ofthe plant, general form of the insect, specific form of the insect, general damage, specific damage, and order and family of the insecto In addition, this systemcan provide information on insectsynonyms, common names, life cycle, damage, pest location, and possible control. The system works with IBM compatible MS-DOS, employs the VP-EXPERT shell, requires 512Kb of RAM, and either two 360 Kb or one 720Kb disk drives, or a hard disk. An evaluation ofthe ease of use of the shell dedicated to diagnostics for insect pests was performed. The purpose was to compare the educationallevel of the user with the ease which the shell was used. A completely randomized design was employed with seven treatments and five observations. The treatments were: secretaries, laboratory support staff, extension agents, bachelor level personnel, M.S., and PhD. level persons. Tbe results indicated that no significant differences within the range evaluated, excluding facility of use. It was concluded that the shell presents operationalilty that can be used by various persons at different education le veis within the studied rangc. expert system was also compared with a book key (‘Las plagas invertebradas de cultivos anuales alimenticios en America Central’). A randomized complete block design was used with two treatments and 18 replications, each replication being one persono The results dcmonstrated that the expert system was superior to the book key and that the expcrt system required much less time to obtain an answer.
Efectos genéticos y heterosis en poblaciones parentales y poblaciones derivadas de maíz (Zea mays L)
Authors: Navarro G. Enrique , Borrego E. Fernando
Published: October 2018

This study with the Gardner-Eberhart model (1966) involved eight maize parental populations and their related populations. The objectives were to estimate the cumulative gene effects (additive, dominance and heterotic) which could The justify support of a maize hybrid programo The grain yield inter-varietal dominance effects accounted for 55.54% of the generation means, suggesting large genetic variability within populations. Heterotic effects accounted for 12.11 %, indicating little difference in gene frequency for loci controlling grain yield. Plant height followed the same pattero as grain yield, since dominance effects were the most important. However, homozygote loci (aj) were important in explaining genetic variability for days to bloom and number of ears. For grain yield, the cross Pop. 32 x Pop. 21 maximized the heterotic effects. Population 21 exhibited a high average heterosis, so we suspect that its, combination with Popo 32 and CN(S)-C3, among others, would be a great genetic material for a Reciprocal Recurrent Selection Programo
Rendimiento y estabilidad de híbridos de maíz de cruzas simples evaluadas en Colombia, México y Centro América
Authors: Srinivasan G. , Vasal S. K. , González Ceniceros F. , Córdova H. , Pandey S. , Vergara N.
Published: October 2018

Three hybrid trials (SC 9007, SC 9008, SC 9009) were evaluated in seven to eight locations in Mexico, Central and South America during 1990-91. Sixty-eight white hybrids were tested in SC 9007 and SC 9008, and 25 yellow hybrids in SC 9009 along with two local checks in each trial. SCll, SC12, SC57, and SC44 among whites, and SC67 among yellows were the most stable hybrids. SC07 (6.49 t/ha.), and SC57 (5.95 t/ha) were the highest yielding white hybrids from SC 9007, and SC9008 respectively. Among yellows, SC82 (5.94 t/ha.), SC80 (5.93 t/ha.), and scn (5.88 t/ha.) were the best performers. Maximum gains over the checks were observed in Cuyuta, Guatemala, and EEEJn, Costa Rica. In Honduras, however, the best hybrid was on par with the best local check hybrid. For Panama, the yellow hybrids, SC77, SC80, SC82 are promising. In Colombia, SC03, SCll, and SC57 among whites, were best adapted.
Potencial de producción de líneas de frijol adzuki (Vigna angularis), en tres localidades de Costa Rica
Authors: Araya Rodolfo , Valerio Eddy , Hernández Hugo
Published: October 2018

Between 1984 and 1988, fourteen adzuki bean lines were evaluated in three localities in Costa Rica: Alajuela at 840 masl., Perez Zeledon at 760 masl. and Rio Frio at 100 masl. Three common bean varieties were used as controls: Talamanca, Huetar and Mexico 80. The best adzuki lines in the three localities were U CR - 2 and U CR - 7 (red colored grain) and UCR-3 (black colored grain). In Rio Frio and Perez Zeledon, the adzuki showed a like production as the common bean, due to the low incidence of Web blight (Thanatephorus cucumeris Frank Donk). This is a fungus which slightly affects the adzuki bean, but it is a limiting factor for common bean production in these two localities. In Alajuela, an ideal zone for common bean production, several adzuki lines showed a higher productivity.
Rendimiento y características agronómicas de frijol de temporal en generaciones tempranas
Authors: Rosales Serna R. , Aguilera Charles D. M. , Acosta-Gallegos J. A.
Published: October 2018

In the bean breeding program of the semiarid region of Mexico, the selection for seed yield is delayed to late generations. The present study was conducted to measure the level of heterosis, heterobeltiosis and inbreeding depression upon several agronomic traits in segregating populations of rainfed beans. Four populations derived from black seeded parents in the F2 and F3 generations, and seven derived from colored beans in the F3 and F4 generations were sown under rainfed conditions. Parents were also included in the trial. Among the black seeded populations, the one derived from the cross BA T 76 X Negro Qro. showed, in both generations, the highest values for seed yield, total dry matter and heterosis, as well as the highest heterobeltiosis value in the F3 generation. In the colored group, the population derived from the cross 102-M X Bayo Victoria showed the highest values for seed yield and heterosis in both generations, and was the only one that showed heterobeltiosis in both generations. The populations that showed high seed yield and heterosis in the first generation, retained these characteristics in the latter one and were derived from the best parents. The results indicate that in dry beans it is possible to predict the best crosses and to identify the high yielding populations in early generations.
Introducción de 54 sorgos escobreros en Honduras
Authors: Cerritos Guillermo , Meckenstock Dan H. , Gómez Francisco , Hash Thomas C.
Published: October 2018

The potential market of broomcorn, Sorghum bicolor (L.) Moench, in Honduras is around 800,000 U.S. dollars per annum. However, its potential has been limited by seed availability. The nationaI sorghum project of the Ministry of Natural Resources and the Panamerican Agricultural School, introduced 54 broomcorn varieties from the world collection in 1991 and evaluated them for adaptation and resistance to the pathotype 5 of Peronosclerospora sorghi in Comayagua, Honduras. Although several varieties (Acme, IS 13,IS 24, and IS 18132) showed good resistance to the pathotype 5 of P. sorghi, fiber production of these resistant varieties ranged 1.0 to 1.4 t/ha with 65 to 87% of the fiber being classified as "hurl".
Resistencia al ataque del picudo del ejote Apion spp. en frijol Phaseolus spp.
Authors: Garza García Ramón , Maruaga Martínez José S.
Published: October 2018

During 1990, 218 bean landraces were grown under rainfall conditions in Santa Lucia de Prias, Mexico, to evaluate its reaction to the attack of pod weevil bean (Apion spp.). The bean plants were exposed to natural pressure of the insect. At the end of the growing season, samples of 30 pods were taken in two replicates and the percentage of damaged pods was quantified. A scale of qualification was used for determining the degree of resistance. Fourty one bean landraces were classified as resistant, which Hgo-19-A, Hgo-40-A, Hgo-51, Tlax-65-A, Jal-112 y Mex-49 were outstanding. The susceptible control cultivars, Canario 107 and Bayomex, showed 38 and 52 percent of damaged pods, respectively.
Rentabilidad del sistema de abonera en el Litoral Atlántico de Honduras
Authors: Sain Gustavo , Ponce Ignacio , Borbón Erick
Published: October 2018

A rotation system of corn (Zea mays L.) with Mucuna sp. has spread along the Atlantic Littoral of Honduras, known by the farmers as "abonera". Due that there is little known about the factors intluencing the adoption process, the present study was eondueted to identify them, as well as to determine the profitability of the system in the short and the long run and to set up the factors and mechanisms affecting this profitability. The study was conducted in the Department of Atlantida and comprises part of the Distric of La Ceiba and the Districs of Jutiapa, San Francisco and Tela. An expansion of the partial budget analysis and an incremental analysis for a period, in order to account for the effects along the time, were used as tools for evaluating its profitability. Six years were taken, for the analysis, as the average life span of the "abonera". It was found in the economical evaluation that the "abonera" is more profitable than the traditional system from the second year onwards. If the profitability approach is the return of the family hand labor, the "abonera" system is al so more profitable starting at the second year and remains so for the rest of the periodo.
Evaluación de la Sacharina Seca (Caña enriquecida) como suplemento en la alimentación de vacas lecheras en la época seca.
Authors: Zamora Reina , Solano Romeo
Published: October 2018

This research was conducted in Region I in Nicaragua to evaluate the use of saccharine (enriched sugar can e) as feed supplement for dairy cattle on a 65 day experimental period during the dry season, using the statistical design of overchange, with four sub-periods of 14 days each. Six (three per group) crossed-bred cows (Brown Swiss x Zebu) were used. They were selected according to their lactating period, age, milk produc-tion and calving date. Before starting the trial, the cows weighed an average of 500 kg and were producing 8 liters of milk per day, in one milking. The experimental group was fed (ad libitum) 4.12 kg of saccharine, after the milking. The results show that the effect of the saccharine on the milk production was highly significant (P>0.01) therefore we con-cluded that the use of saccharine as a feed supplement for this type of cattle is convenient and recommendable.
Hornos forrajeros: Una tecnología promisoria para pequeñas fincas ganaderas del trópico seco.
Authors: Solano Romeo , Rauano Roberto , Zamora Reyna
Published: October 2018

The present work was conducted on different farms of the dry tropics of Nicaragua. The experience was obtained mainly in the municipalities of Esteli, Somoto, Condega, Pueblo Nuevo and Limay, which is the area covering the PRONORTE Project. This region is characterized by an irregular rainfall distribution which varies from 600 to 900 mm and a heavy marked dry season with strong shortages of cattle feed. The fodder kilns were built by the farmers, who were informed in detail on the technology used, so this expcrience was considered as a validation. The cost of dry fodder for the kiln was $0.05/kg, which is readily available to the producers of the region, besides of the use of basic grains' residues, that otherwise would lose their quality and quantity. The acceptability of the fodder kilns was high (100%) and its adoption reached 96%, which means that this technology is appropriate and could be adapted to the socioeconomic conditions of the producers from the dry region of northern Nicaragua.
Impacto del desarrollo de híbridos de maíz en Centro América.
Authors: Córdova H. S. , Barreto H. J. , Crossa J.
Published: October 2018

The progress achieved by the corn hybrids' development in Central America is analyzed as the source for the regional data base of the PCCMCA (Programa Colaborativo Centroamericano para el Mejoramiento de Cultivos y Animales), taking as reference the 51 trials conducted between 1988 and 1990. This evaluation was conducted using a methodology which determines the confidence of response (RNi or probability of normalized response above zero) of superior cultivars with respect to a control. The confidence of the cultivars (HB83,HB85, H30, HA46, Dekalb B833, Pio-neer XLH53, HRI7, MAX307, H33 and TACSA203) was determined as a measure which integrates the magnitude of response as we1l as the variability of yields, with respect to the control H5. The evaluated genotypes were divided into three cIasses with respect to the H5. Genotypes of Superior confidence (H30 and HB85, 0.9>= RNi <= 1.0), Good confidence (HB83, HA46, Dekalb B833, XLH53, 0.8 >= RNi < 0.90) and Average confidence (HRI7, MAX307, H33, 0.6 >= RNi < 0.8). The genotypes HB85 and HB83 showed the highest potential as regional controls. In conclusion, further studies are needed to correlate the use of confidence to other methods in order to determine the genotype stability.
Identificación de virus en el tomate (Lycopersicum sculentum L.) en cinco departamento de Guatemala.
Authors: Dardón Danilo , Calderón Felipe , Salguero Víctor , Lastra Ramón , Browmn Judith
Published: October 2018

A sampling was eonducted at the Departments of Zacapa, Jutiapa, Jalapa, Chimaltenango and Guatemala, to determine the presence of the tomato viruses causing the disease known as "Curly Top" and if they are transmitted by the "white fly" (Bemisia tahaci Gennadius), the presence of six virus: TMV, CMV, TEV, PVY, PVX and TSWV, and two geminivirus CdTV and SCLV was detected, The finding of a single TSWV positive sample makes it necessary to reconfirm its presence in Guatemala because it had not been reported before, Likewise, the geminivirus in tomato had not been reported in Guatemala, as well as the Chinesse Virus of Tomato (VCdT) and the Squash Curly Leaf Virus (SCL V), It was concluded that different viruses are associated to the "Curly Top" disease in tomato and that they cause a diversity of symptoms.