Siga este enlace para ver otros tipos de publicaciones sobre el tema: Techniques de double hybride.
Artículos de revistas sobre el tema "Techniques de double hybride"
Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros
Consulte los 50 mejores artículos de revistas para su investigación sobre el tema "Techniques de double hybride".
Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.
También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.
Explore artículos de revistas sobre una amplia variedad de disciplinas y organice su bibliografía correctamente.
1
Sharma, Sam, Takahiro Hiratsuka, Hisashi Hara y Jeffrey Milsom. "Antigravity ESD – double-balloon-assisted underwater with traction hybrid technique". Endoscopy International Open 06, n.º 06 (junio de 2018): E739—E744. http://dx.doi.org/10.1055/a-0578-8081.
Texto completoResumen
Abstract Background and study aims Complex colorectal polyps or those positioned in difficult anatomic locations are an endoscopic therapeutic challenge. Underwater endoscopic submucosal dissection (UESD) is a potential technical solution to facilitate efficient polyp removal. In addition, endoscopic tissue retraction has been confined to limited methods of varying efficacy and complexity. The aim of this study was to evaluate the efficiency of a unique UESD technique for removing complex polyps using double-balloon-assisted retraction (R). Materials and methods Using fresh ex-vivo porcine rectum, 4-cm polyps were created using electrosurgery and positioned at “6 o’clock” within an established ESD model. Six resections were performed in each group. Underwater techniques were facilitated using a novel double-balloon platform (Dilumen, Lumendi, Westport, Connecticut, United States).Three different polypectomy methods were compared: 1. UESD with retraction (UESD-R), 2. UESD, 3. Traditional cap-assisted ESD technique. Results UESD-R had a significantly shorter total procedural time than cap-assisted ESD and UESD alone (24 vs. 58 vs. 56 mins). UESD-R produced a dissection time on average of 5 minutes, attributed to the retraction provided. There was also a subjective significant reduction in electrosurgical smoke with the underwater techniques contributing to improved visualization. Conclusions Here we report the first ex-vivo experience of a unique double-balloon endoscopic platform optimized for UESD with tissue traction capability. UESD-R removed complex lesions in significantly shorter time than conventional means. The combined benefits of UESD and retraction appeared to be additive when tackling complex polyps and should be studied further.
2
Lee, Jaehan, Seoni Kim, Choonsoo Kim y Jeyong Yoon. "Hybrid capacitive deionization to enhance the desalination performance of capacitive techniques". Energy Environ. Sci. 7, n.º 11 (2014): 3683–89. http://dx.doi.org/10.1039/c4ee02378a.
Texto completo
3
Ezzaoua, Mr Omar. "On Double Narration in Wuthering Heights". American Research Journal of English and Literature 7, n.º 1 (28 de mayo de 2021): 1–4. http://dx.doi.org/10.21694/2378-9026.21006.
Texto completoResumen
Emily Bronte's Wuthering Heights is characterized by the narrative mechanisms and techniques it employs. Building on its structure, the novel is obviously rich in its underlying elements that are worth examining. One of these elements is the choice of multiple narrators and the complex organization of narrative time. This theoretical framework deals mainly with narration and narrative techniques as approached by structuralist narratology. As an approach that examines narration and its major hybrids, narratology delves into a structural study of Wuthering Heights allowing for a deep examination of the underlying narrative elements in the novel. Having said that, it is believed that the study of narratology is pertaining in the sense that it sheds light on how the narrative structure of the novel puts into question the status of the narrators as reliable sources. This structure also mystifies the story giving the reader a chance to decipher the intent of the characters involved as both narrators and characters. Without taking such structure into account, the readers are missing some key elements in understanding and interpreting the stories told by the narrators
4
Steinberg, Christian, Maximilian Rumler, Manuel Runkel, Marc Papenheim, Si Wang, Andre Mayer, Marco Becker, Mathias Rommel y Hella-Christin Scheer. "Complex 3D structures via double imprint of hybrid structures and sacrificial mould techniques". Microelectronic Engineering 176 (mayo de 2017): 22–27. http://dx.doi.org/10.1016/j.mee.2017.01.009.
Texto completo
5
Ghirri, Alberto, Samuele Cornia y Marco Affronte. "Microwave Photon Detectors Based on Semiconducting Double Quantum Dots". Sensors 20, n.º 14 (19 de julio de 2020): 4010. http://dx.doi.org/10.3390/s20144010.
Texto completoResumen
Detectors of microwave photons find applications in different fields ranging from security to cosmology. Due to the intrinsic difficulties related to the detection of vanishingly small energy quanta ℏ ω , significant portions of the microwave electromagnetic spectrum are still uncovered by suitable techniques. No prevailing technology has clearly emerged yet, although different solutions have been tested in different contexts. Here, we focus on semiconductor quantum dots, which feature wide tunability by external gate voltages and scalability for large architectures. We discuss possible pathways for the development of microwave photon detectors based on photon-assisted tunneling in semiconducting double quantum dot circuits. In particular, we consider implementations based on either broadband transmission lines or resonant cavities, and we discuss how developments in charge sensing techniques and hybrid architectures may be beneficial for the development of efficient photon detectors in the microwave range.
6
Romero, Jorge, María Varela, Mhamed Assebban, Víctor Oestreicher, Alejandra Guedeja-Marrón, Jose L. Jordá, Gonzalo Abellán y Eugenio Coronado. "Insights into the formation of metal carbon nanocomposites for energy storage using hybrid NiFe layered double hydroxides as precursors". Chemical Science 11, n.º 29 (2020): 7626–33. http://dx.doi.org/10.1039/d0sc00697a.
Texto completoResumen
The low-temperature formation mechanism of NiFe-carbon magnetic nanocomposites prepared using hybrid sebacate intercalated layered double hydroxides as precursors has been deciphered using a set of in situ characterization techniques.
7
Yang, Fan, Xichuan Liu, Rui Mi, Lei Yuan, Xi Yang, Minglong Zhong, Zhibing Fu, Chaoyang Wang y Yongjian Tang. "A Novel Radiation Method for Preparing MnO2/BC Monolith Hybrids with Outstanding Supercapacitance Performance". Nanomaterials 8, n.º 7 (14 de julio de 2018): 533. http://dx.doi.org/10.3390/nano8070533.
Texto completoResumen
A novel facile process for fabrication of amorphous MnO2/bamboo charcoal monolith hybrids (MnO2/BC) for potential supercapacitor applications using γ-irradiation methods is described. The structural, morphological and electrochemical properties of the MnO2/BC hybrids have been investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques. The combination of BC (electrical double layer charge) and MnO2 (pseudocapacitance) created a complementary effect, which enhanced the specific capacitance and good cyclic stability of the MnO2/BC hybrid electrodes. The MnO2/BC hybrids showed a higher specific capacitance (449 F g−1 at the constant current density of 0.5 A g−1 over the potential range from –0.2 V to 0.8 V), compared with BC (101 F g−1) in 1 M of Na2SO4 aqueous electrolyte. Furthermore, the MnO2/BC hybrid electrodes showed superior cycling stability with 78% capacitance retention, even after 10,000 cycles. The experimental results demonstrated that the high performance of MnO2/BC hybrids could be a potential electrode material for supercapacitors.
8
Xie, Hui Min, Yan Jie Li, Hua Du, Bing Pan, Qiang Luo, Chang Zhi Gu y Hai Chang Jiang. "The Technique for Fabricating Submicron Moiré Grating Using FIB Milling". Advanced Materials Research 47-50 (junio de 2008): 710–13. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.710.
Texto completoResumen
In this study, focused gallium ion (Ga+) beam is utilised to fabricate micro/submicron spacing gratings on specimen surface. The grating types include: parallel, cross, and hybrid (grating with double-frequency). Several hybrid gratings with double frequency were produced in combination mode or superposition mode, which have a good potential to measure deformation within different range. Techniques for producing different type of gratings are discussed in detail. As an application, a 5000 lines/mm grating was fabricated on an amorphous SIC MEMS cantilever and was successfully used to measure its virtual strain with aid of digital moiré. The experimental results verify the feasibility of fabricating high frequency grating on metal or non-metal surface using the FIB milling and the resultant grating can be used to measure micro-deformation.
9
Niazkar, Majid y Seied Hosein Afzali. "Parameter estimation of an improved nonlinear Muskingum model using a new hybrid method". Hydrology Research 48, n.º 5 (28 de octubre de 2016): 1253–67. http://dx.doi.org/10.2166/nh.2016.089.
Texto completoResumen
Although various techniques have been proposed to estimate the parameters of different versions of the Muskingum model, more rigorous techniques and models are still required to improve the computational precision of the calibration process. In this research, a new hybrid technique was proposed for Muskingum parameter estimation. Based on the conducted comprehensive literature review on the Muskingum flood routing models, a new improved Muskingum model with nine constant parameters was presented. Since the inflow-weighted parameter in the proposed model is a function of inflow hydrograph, it varies during the flood period and consequently can also be considered as a variable-parameter Muskingum model. The new hybrid technique was successfully applied for parameter estimation of the new version of Muskingum model for two case studies selected from the literature. Results were compared with those of other methods using several common performance evaluation criteria. The new Muskingum model significantly reduces the sum of the square of the deviations between the observed and routed outflows (SSQ) value for the double-peak case study. Finally, the obtained results indicate that not only the hybrid modified honey bee mating optimization-generalized reduced gradient algorithm somehow overcomes the shortcomings of both zero and first-order optimization techniques, but also the new Muskingum model appears to be the most reliable Muskingum version compared with the other methods considered in this study.
10
Amaloo, Christopher, Daryl P. Nazareth y Lalith K. Kumaraswamy. "Comparison of hybrid volumetric modulated arc therapy (VMAT) technique and double arc VMAT technique in the treatment of prostate cancer". Radiology and Oncology 49, n.º 3 (1 de septiembre de 2015): 291–98. http://dx.doi.org/10.1515/raon-2015-0018.
Texto completoResumen
Abstract Background. Volumetric modulated arc therapy (VMAT) has quickly become accepted as standard of care for the treatment of prostate cancer based on studies showing it is able to provide faster delivery with adequate target coverage and reduced monitor units while maintaining organ at risk (OAR) sparing. This study aims to demonstrate the potential to increase dose conformality with increased planner control and OAR sparing using a hybrid treatment technique compared to VMAT. Methods. Eleven patients having been previously treated for prostate cancer with VMAT techniques were replanned with a hybrid technique on Varian Treatment Planning System. Multiple static IMRT fields (2 to 3) were planned initially based on critical OAR to reduce dose but provide some planning treatment volume (PTV) coverage. This was used as a base dose plan to provide 30-35% coverage for a single arc VMAT plan. Results. The clinical VMAT plan was used as a control for the purposes of comparison. Average of all OAR sparing between the hybrid technique and VMAT showed the hybrid plan delivering less dose in almost all cases except for V80 of the bladder and maximum dose to right femoral head. PTV coverage was superior with the VMAT technique. Monitor unit differences varied, with the hybrid plan able to deliver fewer units 37% of the time, similar results 18% of the time, and higher units 45% of the time. On average, the hybrid plan delivered 10% more monitor units. Conclusions. The hybrid plan can be delivered in a single gantry rotation combining aspects of VMAT with regions of dynamic intensity modulated radiation therapy (IMRT) within the treatment arc.
11
Ismail, Mohamed Saleh, Firas Bahdi, Michael Oliver Mercado, Randa Habazi, Angel Alexander, Sahana Prabhu, Sharon John, Chandra Kovvali y Mohamed O. Othman. "ESD with double-balloon endoluminal intervention platform versus standard ESD for management of colon polyps". Endoscopy International Open 08, n.º 10 (22 de septiembre de 2020): E1273—E1279. http://dx.doi.org/10.1055/a-1226-6372.
Texto completoResumen
Abstract Background and study aims Endoscopic submucosal dissection (ESD) with the double-balloon endoluminal intervention platform (DEIP) is a novel technique for removal of complex colon polyps (> 2 cm) or those located in anatomically difficult positions. DEIP helps create a therapeutic zone with improved visualization and stability, facilitating polyp removal. We aimed to compare the outcomes of DEIP with the conventional cap-assisted ESD (standard ESD) technique for colon polyp resection, in particular, the ability to complete the ESD procedure without resorting to hybrid ESD or piecemeal resection. Patients and methods This was a retrospective cohort of all patients who underwent colon ESD in a single large tertiary referral center between September 2016 and October 2019. Information was collected on patient demographics and study outcomes including procedure time, rates of en bloc and curative resection, operative and postoperative complications. All patients were followed up for 1 month after the procedure. Results 111 patients were included in the study (DEIP 60, standard ESD 51). There was no statistically significant difference between mean procedures time (± SD) in the two groups, mean (81.9 ± 35.4 min standard vs. 96.4 ± 42.2 min in DEIP). Mean polyp size (± SD) was similar between the two groups (7.6 ± 6.0 cm2 vs. 6.2 ± 5.5 cm2, P = .2). There were no significant differences in en bloc and curative resection rates or operative and postoperative complications between the two techniques. Conclusion Procedure time was similar using both techniques. However, DEIP enabled the entire procedure to be performed using the ESD technique without resorting to snare resection, which may affect the en bloc and curative resection rate. There were no significant differences in en bloc and curative resection rates between the two groups, probably due to the small sample size.
12
Tran, Vinh Van, Ju-Young Moon y Young-Chul Lee. "Novel Magnesium Aminoclay-Vitamin C Hybrid for Enhanced Stability and Bioactivity in Cosmeceutical Applications". Journal of Nanoscience and Nanotechnology 20, n.º 7 (1 de julio de 2020): 4257–62. http://dx.doi.org/10.1166/jnn.2020.17583.
Texto completoResumen
Vitamin C (VC) is a hydrophilic antioxidant that plays a vital role in the protection of health and is also an integral ingredient in beauty formulations due to its numerous distinct and necessary properties. However, its application in the area of cosmeceuticals still confronts huge challenges relating to its instability and low bioactivity. Therefore, it is necessary to prevent its degradation by utilizing microencapsulation techniques, many and various of which, entailing the use of liposomes, nanoemulsions, lipid particles, and layered double hydroxide, have already been introduced. Nevertheless, such techniques still have several disadvantages in terms of either their difficult preparation or toxicity to skin. Recently, aminoclay (AC), a synthetic organic-nanoclay comprising 3-aminopropyl-functionalized magnesium phyllosilicate, has been proposed as a promising candidate for encapsulation and delivery of active agents in cosmeceuticals. In the present work, a novel magnesium aminoclay/vitamin C (MgAC-VC) hybrid was successfully fabricated by a simple onepot synthesis method via the in situ loading of VC into MgAC. The resultant hybrid was found to highly improve the stability and controllable release of VC. Compared with free VC, the MgAC-VC hybrid exhibited significantly enhanced stability of VC under high temperature (60 °C) as well as slow and controllable release of VC from MgAC-VC hybrids over 24 h. Our results suggest that such MgAC-VC hybrids can potentially be utilized in cosmeceutical applications for delivery of VC and other antioxidants.
13
Sungheetha, Akey y Rajesh Sharma R. "Classification of Remote Sensing Image Scenes Using Double Feature Extraction Hybrid Deep Learning Approach". June 2021 3, n.º 2 (9 de julio de 2021): 133–49. http://dx.doi.org/10.36548/jitdw.2021.2.006.
Texto completoResumen
Over the last decade, remote sensing technology has advanced dramatically, resulting in significant improvements on image quality, data volume, and application usage. These images have essential applications since they can help with quick and easy interpretation. Many standard detection algorithms fail to accurately categorize a scene from a remote sensing image recorded from the earth. A method that uses bilinear convolution neural networks to produce a lessweighted set of models those results in better visual recognition in remote sensing images using fine-grained techniques. This proposed hybrid method is utilized to extract scene feature information in two times from remote sensing images for improved recognition. In layman's terms, these features are defined as raw, and only have a single defined frame, so they will allow basic recognition from remote sensing images. This research work has proposed a double feature extraction hybrid deep learning approach to classify remotely sensed image scenes based on feature abstraction techniques. Also, the proposed algorithm is applied to feature values in order to convert them to feature vectors that have pure black and white values after many product operations. The next stage is pooling and normalization, which occurs after the CNN feature extraction process has changed. This research work has developed a novel hybrid framework method that has a better level of accuracy and recognition rate than any prior model.
14
Chowdhary, Chiranji Lal, Pushpam Virenbhai Patel, Krupal Jaysukhbhai Kathrotia, Muhammad Attique, Kumaresan Perumal y Muhammad Fazal Ijaz. "Analytical Study of Hybrid Techniques for Image Encryption and Decryption". Sensors 20, n.º 18 (10 de septiembre de 2020): 5162. http://dx.doi.org/10.3390/s20185162.
Texto completoResumen
The majority of imaging techniques use symmetric and asymmetric cryptography algorithms to encrypt digital media. Most of the research works contributed in the literature focus primarily on the Advanced Encryption Standard (AES) algorithm for encryption and decryption. This paper propose an analysis for performing image encryption and decryption by hybridization of Elliptic Curve Cryptography (ECC) with Hill Cipher (HC), ECC with Advanced Encryption Standard (AES) and ElGamal with Double Playfair Cipher (DPC). This analysis is based on the following parameters: (i) Encryption and decryption time, (ii) entropy of encrypted image, (iii) loss in intensity of the decrypted image, (iv) Peak Signal to Noise Ratio (PSNR), (v) Number of Pixels Change Rate (NPCR), and (vi) Unified Average Changing Intensity (UACI). The hybrid process involves the speed and ease of implementation from symmetric algorithms, as well as improved security from asymmetric algorithms. ECC and ElGamal cryptosystems provide asymmetric key cryptography, while HC, AES, and DPC are symmetric key algorithms. ECC with AES are perfect for remote or private communications with smaller image sizes based on the amount of time needed for encryption and decryption. The metric measurement with test cases finds that ECC and HC have a good overall solution for image encryption.
15
Asfirane, Salim, Sami Hlioui, Yacine Amara y Mohamed Gabsi. "Study of a Hybrid Excitation Synchronous Machine: Modeling and Experimental Validation". Mathematical and Computational Applications 24, n.º 2 (27 de marzo de 2019): 34. http://dx.doi.org/10.3390/mca24020034.
Texto completoResumen
This paper deals with a parallel hybrid excitation synchronous machine (HESM). First, an expanded literature review of hybrid/double excitation machines is provided. Then, the structural topology and principles of operation of the hybrid excitation machine are examined. With the aim of validating the double excitation principle of the topology studied in this paper, the construction of a prototype is presented. In addition, both the 3D finite element method (FEM) and 3D magnetic equivalent circuit (MEC) model are used to model the machine. The flux control capability in the open-circuit condition and results of the developed models are validated by comparison with experimental measurements. The reluctance network model is created from a mesh of the studied domain. The meshing technique aims to combine advantages of finite element modeling, i.e., genericity and expert magnetic equivalent circuit models, i.e., reduced computation time. It also allows taking the non-linear characteristics of ferromagnetic materials into consideration. The machine prototype is tested to validate the predicted results. By confronting results from both modeling techniques and measurements, it is shown that the magnetic equivalent circuit model exhibits fairly accurate results when compared to the 3D finite element method with a gain in computation time.
16
Baccar, Zouhair M. y Imène Hafaiedh. "Immobilization of HRP Enzyme on Layered Double Hydroxides for Biosensor Application". International Journal of Electrochemistry 2011 (2011): 1–5. http://dx.doi.org/10.4061/2011/934893.
Texto completoResumen
We present a new biosensor for hydrogen peroxide (H2O2) detection. The biosensor was based on the immobilization of horseradish peroxidase (HRP) enzyme on layered double hydroxides- (LDH-) modified gold surface. The hydrotalcite LDH (Mg2Al) was prepared by coprecipitation in constant pH and in ambient temperature. The immobilization of the peroxidase on layered hybrid materials was realized via electrostatic adsorption autoassembly process. The detection of hydrogen peroxide was successfully observed in PBS buffer with cyclic voltammetry and the chronoamperometry techniques. A limit detection of 9 μM of H2O2was obtained with a good reproducibility. We investigate the sensitivity of our developed biosensor for H2O2detection in raw milk.
17
JABEEN, SYEDA DARAKHSHAN. "SPLIT AND DISCARD STRATEGY: A NEW APPROACH FOR CONSTRAINED GLOBAL OPTIMIZATION". International Journal on Artificial Intelligence Tools 22, n.º 04 (agosto de 2013): 1350023. http://dx.doi.org/10.1142/s0218213013500231.
Texto completoResumen
In this paper we develop a new hybrid algorithm incorporating the penalty function technique for solving nonlinear constrained optimization problems. The principle is based on converting the constrained optimization problem into an unconstrained optimization problem by the penalty function technique. Then, we have proposed a new penalty technique, called Big-M penalty that is different from the existing ones. Accordingly, a hybrid algorithm has been developed based on Split and Discard Strategy (SDS) and advanced real coded genetic algorithm (ARCGA), with tournament selection, multiparent whole arithmetical crossover, double mutation (boundary and whole nonuniform mutation) and elitism. In SDS technique, the entire search space is divided into two equal subregions. Then the one containing the feasible solution with better fitness value is selected. This process is repeated until the accepted subregion reduces to a very small region with negligible edges. Finally, to test the performance of the proposed method along with three different penalty function techniques, it is applied to several well-known benchmark test problems available in the literature.
18
Gohi, Bi Foua Claude Alain, Hong-Yan Zeng, Xiao-Ju Cao, Kai-Min Zou, Wenlin Shuai y Yi Diao. "Preparation of the Hybrids of Hydrotalcites and Chitosan by Urea Method and Their Antimicrobial Activities". Polymers 11, n.º 10 (28 de septiembre de 2019): 1588. http://dx.doi.org/10.3390/polym11101588.
Texto completoResumen
Hybrid nano-supra molecular structured materials can boost the functionality of nano- or supra-molecular materials by providing increased reactivity and conductivity, or by simply improving their mechanical stability. Herein, the studies in materials science exploring hybrid systems are investigated from the perspective of two important related applications: healthcare and food safety. Interfacing phase strategy was applied, and ZnAl layered double hydroxide-chitosan hybrids, prepared by the urea method (U-LDH/CS), were successfully synthesized under the conditions of different chitosan(CS) concentrations with a Zn/Al molar ratio of 5.0. The structure and surface properties of the U-LDH/CS hybrids were characterized by X-ray diffraction (XRD), Fourier-transform infrared spectrometer(FTIR), scanning electronmicroscopy (SEM), ultravioletvisible (UV-Vis), and zero point charge (ZPC) techniques, where the effect of CS concentration on the structure and surface properties was investigated. The use of the U-LDH/CS hybrids as antimicrobial agents against Escherichia coli, Staphylococcus aureus, and Penicillium cyclopium was investigated in order to clarify the relationship between microstructure and antimicrobial ability. The hybrid prepared in a CS concentration of 1.0 g∙L−1 (U-LDH/CS1) exhibited the best antimicrobial activity and exhibited average inhibition zones of 24.2, 30.4, and 22.3mm against Escherichia coli, Staphylococcus aureus, and Penicillium cyclopium, respectively. The results showed that the appropriate addition of CS molecules could increase antimicrobial ability against microorganisms.
19
Hoshikawa, Yasuto, Eiichi Yasuda, Takamasa Onoki, Masaru Akao y Yasuhiro Tanabe. "Sol-Gel Derived Methylsiloxane-Ca-Nb-Ta Coating on Titanium Surface by Double Layered Structure". Key Engineering Materials 361-363 (noviembre de 2007): 693–96. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.693.
Texto completoResumen
Titanium (Ti) and its alloy have sufficient mechanical properties to be utilized as artificial hip joints and article teeth. However, they have no bioactivity. In this work, we prepared bioactive coatings on Ti by sol-gel techniques. The coatings had a double layered structure. Underlying layer was methylsiloxane (MS) consisted of methyltriethoxysilane (MTES). Top layer was MS-Ca-Nb-Ta hybrid composed of MTES, calcium nitrate tetrahydrate, pentaethoxy-niobium and pentaethoxy-tantalum. The coating exhibited formation of bone-like apatite in SBF immersion test. Adhesive strength of the coating was found to be 1.8 MPa.
20
Banteywalu, Solomon Mamo, Getachew Bekele, Baseem Khan, Valentijn De Smedt y Paul Leroux. "A High-Reliability Redundancy Scheme for Design of Radiation-Tolerant Half-Duty Limited DC-DC Converters". Electronics 10, n.º 10 (12 de mayo de 2021): 1146. http://dx.doi.org/10.3390/electronics10101146.
Texto completoResumen
Redundancy techniques are commonly used to design radiation- and fault-tolerant circuits for space applications, to ensure high reliability. However, higher reliability often comes at a cost of increased usage of hardware resources. Triple Modular Redundancy (TMR) ensures full single fault masking, with a >200% power and area overhead cost. TMR/Simplex ensures full single fault masking with a slightly more complicated circuitry, inefficient use of resource and a >200% power and area overhead cost, but with higher reliability than that of TMR. In this work, a high-reliability Spatial and Time Redundancy (TR) hybrid technique, which does not abandon a working module and is applicable for radiation hardening of half-duty limited DC-DC converters, is proposed and applied to the design of a radiation-tolerant digital controller for a Dual-Switch Forward Converter. The technique has the potential of double fault masking with a <2% increase in resource overhead cost compared to TMR. Moreover, for a Simplex module failure rate, λ, of 5%, the Reliability Improvement Factor (RIF) over the Simplex system is 20.8 and 500 for the proposed technique’s two- and three-module implementations, respectively, compared to a RIF over the Simplex system of only 7.25 for TMR and 14.3 for the regular TMR/Simplex scheme.
21
Ahmed, N., S. A. Aljunid, Hilal A. Fadil, R. B. Ahmad y M. A. Rashid. "Hybrid OCDMA over WDM System Using Modified Double Weight (MDW) Code for Optical Access Network". Advanced Materials Research 433-440 (enero de 2012): 3878–83. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.3878.
Texto completoResumen
In this paper a hybrid optical code division multiple access (OCDMA) over wavelength division multiplexing (WDM) network is proposed to support large number of subscribers. The system combines two different techniques, namely OCDMA and WDM for supporting many subscribers simultaneously. We used modified double weight (MDW) codes as a signature address in designing the system because this code can accommodate more number of simultaneous active users under considerable standard bit error rate (e.g. ≤ 10-9). The induced MDW code for hybrid system can eliminate multiuser interference fully and increase the bit-error-rate performance compared to other codes at the same time. We ascertained by simulation results that the proposed scheme provides very good performance and enhance the network capability. Therefore, this system can be considered as a promising solution for the next generation optical access network.
22
Beregoi, Mihaela, Nicoleta Preda, Andreea Costas, Monica Enculescu, Raluca Negrea, Horia Iovu y Ionut Enculescu. "Synthesis of Core–Double Shell Nylon-ZnO/Polypyrrole Electrospun Nanofibers". Nanomaterials 10, n.º 11 (12 de noviembre de 2020): 2241. http://dx.doi.org/10.3390/nano10112241.
Texto completoResumen
Core–double shell nylon-ZnO/polypyrrole electrospun nanofibers were fabricated by combining three straightforward methods (electrospinning, sol–gel synthesis and electrodeposition). The hybrid fibrous organic–inorganic nanocomposite was obtained starting from freestanding nylon 6/6 nanofibers obtained through electrospinning. Nylon meshes were functionalized with a very thin, continuous ZnO film by a sol–gel process and thermally treated in order to increase its crystallinity. Further, the ZnO coated networks were used as a working electrode for the electrochemical deposition of a very thin, homogenous polypyrrole layer. X-ray diffraction measurements were employed for characterizing the ZnO structures while spectroscopic techniques such as FTIR and Raman were employed for describing the polypyrrole layer. An elemental analysis was performed through X-ray microanalysis, confirming the expected double shell structure. A detailed micromorphological characterization through FESEM and TEM assays evidenced the deposition of both organic and inorganic layers. Highly transparent, flexible due to the presence of the polymer core and embedding a semiconducting heterojunction, such materials can be easily tailored and integrated in functional platforms with a wide range of applications.
23
Maria y Yassine. "Machine Learning Based Approaches for Modeling the Output Power of Photovoltaic Array in Real Outdoor Conditions". Electronics 9, n.º 2 (12 de febrero de 2020): 315. http://dx.doi.org/10.3390/electronics9020315.
Texto completoResumen
It is important to investigate the long-term performances of an accurate modeling of photovoltaic (PV) systems, especially in the prediction of output power, with single and double diode models as the configurations mainly applied for this purpose. However, the use of one configuration to model PV panel limits the accuracy of its predicted performances. This paper proposes a new hybrid approach based on classification algorithms in the machine learning framework that combines both single and double models in accordance with the climatic condition in order to predict the output PV power with higher accuracy. Classification trees, k-nearest neighbor, discriminant analysis, Naïve Bayes, support vector machines (SVMs), and classification ensembles algorithms are investigated to estimate the PV power under different conditions of the Mediterranean climate. The examined classification algorithms demonstrate that the double diode model seems more relevant for low and medium levels of solar irradiance and temperature. Accuracy between 86% and 87.5% demonstrates the high potential of the classification techniques in the PV power predicting. The normalized mean absolute error up to 1.5% ensures errors less than those obtained from both single-diode and double-diode equivalent-circuit models with a reduction up to 0.15%. The proposed hybrid approach using machine learning (ML) algorithms could be a key solution for photovoltaic and industrial software to predict more accurate performances.
24
Sadiq, Shadman T. y İhsan Yaşa. "New Techniques Used for Removing Antibiotic Residues and Antibiotic Resistance Genes from Water". Recent Advances in Biology and Medicine 5 (2019): 1. http://dx.doi.org/10.18639/rabm.2019.874345.
Texto completoResumen
Overuse and misuse of different antibiotics are considered as one of the main causes of antibiotics accumulation in the environment, most commonly used antibiotics are semimetabolized and excreted by humans to the environment. Studies reported that antibiotic usage exceeds 100,000 tons per year, and this amount may be shocking. However, in fact, the persistence of antibiotic compounds may be more dangerous than the used amount, so it is necessary to develop new methods for elimination of these new pollutants from the environment, especially from water. In this paper, we highlight new and more efficient methods used for removing antibiotic residues (AR) and antibiotic resistance genes (ARGs). The new techniques are Fe3O4/red mud nanoparticles, 3D hierarchical porous-structured biochar aerogels, calcined layered double hydroxides, co-doped UiO-66 nanoparticles, Cu@TiO2 hybrids, bioelectrochemical systems, and aerobic granulation process. Most of these methods showed good performance in removing AR and ARGs that ranged from 85% to 95%. These percentages are consider very efficient compared with traditional wastewater treatment methods.
25
Vyas, A., V. Nizalapur, P. Chhasia, D. Rawal, G. Jain y A. Das. "ANALYSIS OF DIFFERENT POLARIMETRIC DECOMPOSITION TECHNIQUES USING COMPACT POLARIMETRIC NISAR DATA FOR AHMEDABAD, INDIA". International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B3-2021 (28 de junio de 2021): 135–40. http://dx.doi.org/10.5194/isprs-archives-xliii-b3-2021-135-2021.
Texto completoResumen
Abstract. The present study addresses the potential of airborne NASA – ISRO Synthetic Aperture Radar (NISAR) compact polarimetric (CP) data to discriminate the land cover classes emphasizing the urban area for parts of Ahmedabad city, India. This has been carried out by generating m-Delta, m-Chi and m-Alpha polarimetric decompositions using Compact Polarimetric L band NISAR data. In Hybrid Polarimetric data, both m-delta and m-chi decompositions have almost the same formulations, indicating that delta and chi play the same roles as indicators of single-bounce and double-bounce scattering. However, M-delta seem preferable over M-chi as stoke parameter delta is highly susceptible towards orientation. It is also observed that building orientation and density has effect on scattering pattern. This is attributed to the target orientation which is parallel to the look direction of the sensor. Supervised classification of m-Delta decomposition was carried out and over all accuracy of 81.1 % was observed in the study.
26
Eva, Lucian, Letitia Doina Duceac, Liviu Stafie, Constantin Marcu, Geta Mitrea, Elena Roxana Bogdan Goroftei, Elena Hanganu et al. "Physical - Chemical Issues of Cephalosporin Intercalated Nanoparticles for Life - Threatening Infections Treatment". Revista de Chimie 71, n.º 3 (1 de enero de 2001): 342–49. http://dx.doi.org/10.37358/rc.20.3.8007.
Texto completoResumen
The fourth generation cephalosporin antibacterial agent, cefepime, was loaded into layered double hydroxides for enhancing antibiotic efficiency, reducing side effects, as well as achieving the sustained release property. The intercalation of antibiotic into the inter-gallery of ZnAl-layered double hydroxide (LDH) was carried out using ion exchange method, by this constituting a nano-sized organic-inorganic hybrid material for a controlled release novel formulation. Although cefepime is a broad spectrum antibiotic, it has various adverse effects and a significant degradation rate. Thus, the preparation and physico-chemical characterization of nanomaterials able to intercalate this drug is an important study for medical and pharmaceutical field. The antibiotic inclusion into LDHs nanostructure was confirmed by advanced characterization techniques and the release profile of cefepime was analysed with the respect to pH of the simulated media.
27
Zhang, Qian, Qiyu Gu, Fabrice Leroux, Pinggui Tang, Dianqing Li y Yongjun Feng. "Co-intercalated layered double hydroxides as thermal and photo-oxidation stabilizers for polypropylene". Beilstein Journal of Nanotechnology 9 (5 de diciembre de 2018): 2980–88. http://dx.doi.org/10.3762/bjnano.9.277.
Texto completoResumen
An elegant and efficient approach consisting in the co-intercalation of stabilizing molecular anions is described here. The thermal stabilizer calcium diethyl bis[[[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]methyl]phosphonate] (Irganox 1425, MP-Ca) and a photo-oxidation stabilizer (hindered amine light stabilizer, HALS) are co-intercalated into the interlayer regions of layered double hydroxides (LDH) in a one-step coprecipitation. These hybrid organic–inorganic materials are successively dispersed in polypropylene to form H n M n ′-Ca2Al/PP composite films (with H = HALS and M = MP) through a solvent casting method. The corresponding crystalline structure, chemical composition, morphology as well as the resistance against thermal aging and photo-oxidation are carefully investigated by various techniques. The results show that the powdered H n M n ′-Ca2Al-LDHs hybrid materials have a much higher thermal stability than MP-Ca and HALS before intercalation. In addition, the H n M n ′-Ca2Al/PP composites exhibit a higher overall resistance against thermal degradation and photo-oxidation compared to LDHs intercalated with only HALS or MP. This underlines the benefit of the co-intercalation. The co-intercalated LDH materials pave a new way in designing and fabricating high-performance multifunctional additives for polymers.
28
Sobhana, Liji, Lokesh Kesavan, Jan Gustafsson y Pedro Fardim. "Topochemical engineering of composite hybrid fibers using layered double hydroxides and abietic acid". Beilstein Journal of Nanotechnology 10 (28 de febrero de 2019): 589–605. http://dx.doi.org/10.3762/bjnano.10.60.
Texto completoResumen
Topochemical engineering of hybrid materials is an efficient way of synthesizing hydrophobic and highly tensile fiber composites by utilizing the intermolecular hydrogen bonds in natural materials. These materials include wood pulp fibers, abietic acid (resin acid) and inexpensive metal salts. In this work, a hybrid composite was created using bleached and unbleached kraft pulp fibers as cellulose platform. In situ co-precipitation of layered double hydroxide (LDH) was performed to grow LDH crystals on the surface of the cellulose fibers, followed by the immobilization of abietic acid (AA) on LDH-grafted cellulose. Here we aimed to benefit from the hydrogen bonding between –OH groups of cellulose and LDH, and the –COOH groups of AA to obtain charge-directed assembly of one material on the other material. Thus, composite hybrid fibers (C-HF) were produced and then characterized by optical (CAM), spectroscopic (XRD, IR) and microscopic techniques (SEM) to determine their average length and distribution, structure and purity, bonding, and morphology. These fibers further were tested for water contact angle (hydrophobicity), oil absorption (lipophilicity), tensile strength and ISO brightness measurements. The performance of C-HF was compared with unmodified reference fibers (REF), fibers composed with only AA (C-F) and LDH-hybridized fibers (HF). The results revealed a variety of correlations between materials and their properties due to characteristic surface morphology, functional groups, hydrogen bonding and natural co-materials such as lignin and hemicelluloses. Attractive and repulsive van der Waals forces between material entities play a crucial role in the resulting properties.
29
Rebitski, Ediana Paula, Margarita Darder y Pilar Aranda. "Layered double hydroxide/sepiolite hybrid nanoarchitectures for the controlled release of herbicides". Beilstein Journal of Nanotechnology 10 (9 de agosto de 2019): 1679–90. http://dx.doi.org/10.3762/bjnano.10.163.
Texto completoResumen
In this work, organic–inorganic hybrid nanoarchitectures were prepared in a single coprecipitation step by assembling magnesium–aluminum layered double hydroxides (MgAl-LDH) and a sepiolite fibrous clay, with the simultaneous encapsulation of the herbicide 2-methyl-4-chlorophenoxyacetic acid (MCPA) as the MgAl-LDH retains its ion exchange properties. The synthetic procedure was advantageous in comparison to the incorporation of MCPA by ion exchange after the formation of the LDH/sepiolite nanoarchitecture in a previous step, as it was less time consuming and gave rise to a higher loading of MCPA. The resulting MCPA-LDH/sepiolite nanoarchitectures were characterized by various physicochemical techniques (XRD, FTIR and 29Si NMR spectroscopies, CHN analysis and SEM) that revealed interactions of LDH with the sepiolite fibers through the silanol groups present on the outer surface of sepiolite, together with the intercalation of MCPA in the LDH confirmed by the increase in the basal spacing from 0.77 nm for the pristine LDH to 2.32 nm for the prepared materials. The amount of herbicide incorporated in the hybrid nanoarchitectures prepared by the single-step coprecipitation method surpassed the CEC of LDH (ca. 330 mEq/100 g), with values reaching 445 mEq/100 g LDH for certain compositions. This suggests a synergy between the inorganic solids that allows the nanoarchitecture to exhibit better adsorption properties than the separate components. Additionally, in the release assays, the herbicide incorporated in the hybrid nanoarchitectures could be completely released, which confirms its suitability for agricultural applications. In order to achieve a more controlled release of the herbicide and to act for several days on the surface of the soil, the hybrid nanoarchitectures were encapsulated in a biopolymer matrix of alginate/zein and shaped into spheres. In in vitro tests carried out in bidistilled water, a continuous release of MCPA from the bionanocomposite beads was achieved for more than a week, while the non-encapsulated materials released the 100% of MCPA in 48 h. Besides, the encapsulation may allow for better handling and transport of the herbicide.
30
Andriyani, Meita, Sonya Harwasih y Eny Inayati. "Fabrication Technique of Dental Restoration Using Hybrid Ceramic With Cad Cam Method". Journal Of Vocational Health Studies 1, n.º 1 (3 de julio de 2017): 32. http://dx.doi.org/10.20473/jvhs.v1.i1.2017.32-38.
Texto completoResumen
Background : Ceramic is superior in aesthetic but fragile and breakable under bite pressure . Lack of understanding of material requirements for resistance in the oral cavity and minimal ceramic processing techniques is the initial cause of the failure. Hybrid ceramic dental restoration is a material that combines the good properties of ceramics and composites that have elasticity and ensures high strength and minimize the wall thickness of the restoration. Mechanical manufacture of dental restorations currently growing, CAD CAM systems are becoming popular in the field of dentistry. CAD CAM provides the advantage that the effectiveness of the time, does not require a lot of human resources, and produce a restoration with good quality. Purpose: To explain hybrid ceramic material and techniques of making hybrid ceramic dental restorations with CAD CAM system. Review: Hybrid ceramic is a material that combines the advantages of ceramics and composite elasticity. This material contains a hybrid structure with two networks, ceramic and polymer are linked to each other, known as double hybrid network. It added that the structure of the ceramic feldspathic network (86% wt) is reinforced by a polymer network (14% wt) are integrated as a polymer network filling cavities that exist in the network and make its structure ceramic hybrid ceramic material becomes denser. Conclusion: Hybrid ceramic having chewing load capacity and high elasticity, flexural strength 150-160 Mpa and fracture toughness 1.5 Mpa, higher than conventional ceramics. Mechanical manufacture of dental restorations using ceramic hybrid materials with CAD CAM method begins with scanning, selection of materials and tooth shade, designing, milling, followed by finishing, polishing, ends with staining and glazing.
31
Plessis, A. y J. H. Camonis. "Le système double-hybride, mode d'emploi." médecine/sciences 10, n.º 6-7 (1994): R1. http://dx.doi.org/10.4267/10608/2710.
Texto completo
32
Marescalchi, Ombretta y Valerio Scali. "Chromosomal and NOR patterns in the polyclonal stick insect Bacillus atticus atticus (Insecta; Phasmatodea)". Genome 40, n.º 2 (1 de abril de 1997): 261–70. http://dx.doi.org/10.1139/g97-037.
Texto completoResumen
Bacillus atticus atticus is a complex of thelytokous parthenogens, related to the bisexual Bacillus grandii, that ranges from Sardinia to Near Eastern countries. Karyotypic and cytogenetic differentiation of the B. atticus atticus diploid unisexual "isolates" is really higher than expected. Its standard karyotype has 2n = 34 chromosomes, but several instances of repatterned or even aneuploid complements have been found. The number and location of silver-stained NORs are particularly intriguing, since in addition to homozygous NOR patterns, simple or double hemizygous strains are found spread over specific and wide regions. The odd patterns are not due to Ag-NOR staining technique artifacts, since the FISH method, using rDNA probes, apparently labels the same ribosomal clusters. Transpositions and translocations have been suggested to account for some NOR patterns, but hybridizations between different NOR-bearing races are also a possible cause. This chromosomal survey clearly contributes to a better understanding of B. atticus phylogeny.Key words: aneuploidy, interracial hybrids, karyotype repatterning, NOR techniques, unisexuals.
33
Al Naim, A. F., J. Mazher y S. S. Ibrahim. "Morphological and Thermal Properties of Poly(Vinyl Alcohol)/Layered Double Hydroxide Hybrid Nanocomposite Fibers". International Journal of Polymer Science 2020 (5 de noviembre de 2020): 1–14. http://dx.doi.org/10.1155/2020/8858138.
Texto completoResumen
Nanolayered particulate of Zn-based layered double hydroxide (LDH) was prepared by a low temperature greener sol-gel method. X-ray diffraction (XRD) studies were performed on the particles annealed at different temperatures. Hexagonal crystal structure of the as-grown LDH particulates was observed. The crystal structure was modified to tetragonal structure of layered double oxide (LDO) on annealing at 250°C. Rietveld fittings showed a collapse of interlayer separation distance along the preferred orientation of the LDH particles as a result of heat treatment. Further, LDH particles were used as fillers of electrospun poly(vinyl alcohol) (PVA) fibers. Heat treatment of the polymer fibers was also performed at different temperatures, and thermal changes were studied by thermogravimetric analysis (TGA), Raman spectroscopy, and scanning electron microscopy (SEM) techniques. Improved interaction of fibers with LDH nanoparticles was observed and ascribed to LDH-related LDO phase transformation at higher temperature. Thermal mechanisms of the rapid weight loss in filled fibers were discussed in comparison to the pure PVA fiber losses. Experimental Raman frequencies of the composite fibers were compared with the calculated Raman modes of the enol and ZnO monomers. The molecular vibration frequencies were found to differ significantly due to heat treatment. Finally, the role filler in the faster and greener thermal decomposition of polymeric fibers was also discussed in the present work.
34
İpek, Yeliz, M. Kasım Şener y Atıf Koca. "Electrochemical pesticide sensor based on Langmuir–Blodgett film of cobalt phthalocyanine-anthraquinone hybrid". Journal of Porphyrins and Phthalocyanines 19, n.º 05 (mayo de 2015): 708–18. http://dx.doi.org/10.1142/s1088424615500182.
Texto completoResumen
A cathode active and selective pesticide electrochemical sensor based on Langmuir–Blodgett (LB) film of cobalt phthalocyanine-anthraquinone hybrid (CoPc-AQ) was constructed for the first time in this study. Cobalt-based, Pc ring-based, and anthraquinone-based reduction processes of CoPc-AQ indicated suitability of the complex as a possible electrochemical catalyst and sensor for detection of target species. LB film of CoPc-AQ on ITO (ITO/CoPc-AQ electrode) was titrated with eserine and carbofuran pesticides and interaction of the electrode with these pesticides was tested with square wave voltammetry (SWV), electrochemical impedance spectroscopy (EIS), and double potential step chronocoulometry (DPSCC) techniques. ITO/CoPc-AQ electrode selectively sensed carbofuran and eserine pesticides. While ITO/CoPc-AQ electrode senses carbofuran with the voltammetric responses recorded at anodic potentials (1.20 V), eserine sensing affected antraquinone based reduction peaks recorded at cathodic potentials (-0.80 V). Modification of ITO/CoPc-AQ electrode with nano-platinum and nano-gold particles (ITO/CoPc-AQ-n Pt and ITO/CoPc-AQ-n Au ) increased the sensitivity of the electrode. All basic sensor parameters of modified electrodes were derived with different measurement techniques and compared with each other. The lowest detection limit (2.30 × 10-9 M) was recorded with EIS techniques on ITO/CoPc-AQ-n Pt electrode for sensing of eserine.
35
Yasser, Ibrahim, Fahmi Khalifa, Mohamed A. Mohamed y Ahmed S. Samrah. "A New Image Encryption Scheme Based on Hybrid Chaotic Maps". Complexity 2020 (25 de julio de 2020): 1–23. http://dx.doi.org/10.1155/2020/9597619.
Texto completoResumen
Chaos-based encryption algorithms offer many advantages over conventional cryptographic algorithms, such as speed, high security, affordable overheads for computation, and procedure power. In this paper, we propose a novel perturbation algorithm for data encryption based on double chaotic systems. A new image encryption algorithm based on the proposed chaotic maps is introduced. The proposed chaotification method is a hybrid technique that parallels and combines the chaotic maps. It is based on combination between Discrete Wavelet Transform (DWT) to decompose the original image into sub-bands and both permutation and diffusion properties are attained using the chaotic states and parameters of the proposed maps, which are then concerned in shuffling of pixel and operations of substitution, respectively. Security, statistical test analyses, and comparison with other techniques indicate that the proposed algorithm has promising effect and it can resist several common attacks. Namely, the average values for UACI and NPCR metrics were 33.6248% and 99.6472%, respectively. Additionally, unscrambling quality can fulfill security and execution prerequisites as evidenced by PSNR (9.005955) and entropy (7.999275) values. In sum, the proposed method has enough ability to achieve low residual intelligibility with high quality recovered data, high sensitivity, and high security performance compared to some other recent literature approaches.
36
Malela-Majika, Jean-Claude, Sandile C. Shongwe, Muhammad Aslam y Saddam A. Abbasi. "Robust Distribution-Free Hybrid Exponentially Weighted Moving Average Schemes Based on Simple Random Sampling and Ranked Set Sampling Techniques". Mathematical Problems in Engineering 2021 (26 de julio de 2021): 1–21. http://dx.doi.org/10.1155/2021/4035011.
Texto completoResumen
This paper proposes new nonparametric hybrid exponentially weighted moving average (HEWMA) control charts based on simple random sampling (SRS) and ranked set sampling (RSS) techniques using the Wilcoxon rank-sum W statistic. The in-control robustness and out-of-control (OOC) performances are thoroughly investigated using extensive simulations. The HEWMA W chart is shown to be superior to the basic exponentially weighted moving average (EWMA) and double EWMA W charts in many cases under normal and nonnormal distributions. Moreover, the OOC sensitivities of the new HEWMA W -type control charts are further improved by using supplementary 2-of-2 and 2-of-3 standard and improved runs-rules approaches. It is found that the proposed HEWMA W -type charts with runs-rules perform better than the basic HEWMA W SRS and RSS charts. Real-life data based on the impurity of iron ore are used to illustrate the design and implementation of the new control charts.
37
Espinosa, Alejandro, Margarita Tadeo y Angel Piña del Valle. "Estabilidad del rendimiento en híbridos de maíz por diferente orden de cruza en la producción de semilla." Agronomía Mesoamericana 6 (2 de junio de 2016): 98. http://dx.doi.org/10.15517/am.v6i0.24813.
Texto completoResumen
When there is not a synchronized blooming of the progenitors of a double hybrid, the "criss cross" technique can be used, which consist of interchanging lines in a cross to eliminate the blooming differences; as it happens to the H-l37 double corn hybrid for the High Mexican Valleys (2200 to 2350 masl). This technique is used with this corn to ease the seed production process and to lessen the blooming differential. Five different combinations of the H-137 hybrid, as well as two trilineal hybrids (obtained with three out of the four lines of the mentioned double hybrid) were evaluated in this trial. The main objective was to define the productive capacity and stability of the different crossing orders. Three assays were conducted: two in Chapingo and one in Cuautitlan, Mexico; located at 2240 masl. The stability parameters of Eberhart and Russell (1966) were applied, defining the seven genotypes as 'stables'. The original crossing order (M37x M36) x (M17xM18) yielded 5.32 tlha and was numericalIy surpassed by all the other alternating combinations. The inverse crosses (M17xM18) x (M37xM38) and (M36xM 17) x (M37xM18) surpassed the original cross by 13.2% and 16.4%, respectively; although all the combinations were statistically similar. The two trilineal hybrids statistically surpassed all other crosses.
38
Alshehri, Mansoor H. y James M. Hill. "Suction Energy for Double-Stranded DNA Inside Single-Walled Carbon Nanotubes". Quarterly Journal of Mechanics and Applied Mathematics 70, n.º 4 (3 de agosto de 2017): 387–400. http://dx.doi.org/10.1093/qjmam/hbx016.
Texto completoResumen
Summary Deoxyribonucleic acid (DNA) and carbon nanotubes (CNTs) constitute hybrid materials with the potential to provide new components with many applications in various technology areas, such as molecular electronics, field devices and medical applications. Using classical applied mathematical modelling, we investigate the suction force experienced by a double-stranded DNA (dsDNA) molecule which is assumed to be located on the axis near an open end of a semi-infinite single-walled CNT. We employ both the 6-12 Lennard-Jones potential and the continuum approximation, which assumes that a discrete atomic structure can be replaced by a surface with constant average atomic density. While most research in the area is dominated by molecular dynamics simulations, here we use elementary mechanical principles and classical applied mathematical modelling techniques to formulate explicit analytical criteria and ideal model behaviour. We observe that the suction behaviour depends on the radius of the CNT, and we predict that it is less likely for a dsDNA molecule to be accepted into the CNT when the value of the tube radius is ${<}12.9$ Å. The dsDNA molecule will be accepted into the CNT for radii lager than 13 Å, and we show that the optimal single-walled CNT necessary to fully enclose the DNA molecule has a radius of 13.56 Å, which approximately corresponds to the chiral vector numbers (20, 20). This means that the ideal single-walled CNT to be used to encapsulate a dsDNA is (20, 20) which has the required radius of 13.56 Å.
39
Pavel, Octavian D., Ariana Şerban, Rodica Zăvoianu, Elena Bacalum y Ruxandra Bîrjega. "Curcumin Incorporation into Zn3Al Layered Double Hydroxides—Preparation, Characterization and Curcumin Release". Crystals 10, n.º 4 (26 de marzo de 2020): 244. http://dx.doi.org/10.3390/cryst10040244.
Texto completoResumen
Curcumin (CR) is a natural antioxidant compound extracted from Curcuma longa (turmeric). Until now, researches related to the incorporation of CR into layered double hydroxides (LDHs) were focused only on hybrid structures based on a MgxAl-LDH matrix. Our studies were extended towards the incorporation of CR in another type of LDH-matrix (Zn3Al-LDH) which could have an even more prolific effect on the antioxidant activity due to the presence of Zn. Four CR-modified Zn3Al-LDH solids were synthesized, e.g., PZn3Al-CR(Aq), PZn3Al-CR(Et), RZn3Al-CR(Aq) and RZn3Al-CR(Et) (molar ratio CR/Al = 1/10, where P and R stand for the preparation method (P = precipitation, R = reconstruction), while (Aq) and (Et) indicate the type of CR solution, aqueous or ethanolic, respectively). The samples were characterized by XRD, Attenuated Total Reflectance Fourier Transformed IR (ATR-FTIR) and diffuse reflectance (DR)-UV–Vis techniques and the CR-release was investigated in buffer solutions at different pH values (1, 2, 5, 7 and 8). XRD results indicated a layered structure for PZn3Al-CR(Aq), PZn3Al-CR(Et), RZn3Al-CR(Aq) impurified with ZnO, while RZn3Al-CR(Et) contained ZnO nano-particles as the main crystalline phase. For all samples, CR-release revealed a decreasing tendency towards the pH increase, and higher values were obtained for RZn3Al-CR(Et) and PZn3Al-CR(Et) (e.g., 45% and 25%, respectively at pH 1).
40
de Castro, Vander A., Valber G. O. Duarte, Danúbia A. C. Nobre, Geraldo H. Silva, Vera R. L. Constantino, Frederico G. Pinto, Willian R. Macedo y Jairo Tronto. "Plant growth regulation by seed coating with films of alginate and auxin-intercalated layered double hydroxides". Beilstein Journal of Nanotechnology 11 (24 de julio de 2020): 1082–91. http://dx.doi.org/10.3762/bjnano.11.93.
Texto completoResumen
Auxins are a class of organic substances known as plant-growth regulators, which act on plant physiology, promoting its full development. However, due to the great instability of these substances among the diversity of crops and cultivation environments, it is necessary to seek more efficient modes of application, which lead to a homogeneous distribution and promote a sustained release according to the plants demand. Seed coating, using films containing a biodegradable polymer and auxins intercalated into layered compounds, emerges as a very promising approach to a new form of growth regulator application. Thus, the presented work had three aims: (i) the synthesis and characterization of an organic–inorganic hybrid material containing a layered double hydroxide (LDH) of zinc and aluminum and the synthetic auxin 1-naphthalenoacetic acid (ZnAl-NAA-LDH), (ii) the coating of bean seeds (Phaseolus vulgaris L.) with composite films produced from mixtures of alginate polymer and ZnAl-NAA-LDH, and (iii) the evaluation of the plant response by bioassays. The hybrid ZnAl-NAA-LDH was characterized by a set of analytical techniques, including powder X-ray diffraction, thermogravimetric analysis coupled to differential scanning calorimetry and mass spectrometry, specific surface area measurement, and scanning electron microscopy. Bioassays were performed with the seeds coated with the composite film to assess the germination rate and germination speed index of the seeds, as well as biometric analyses including measurements of root area, root fresh matter, and shoot length of the plants. The bioassay performed in soil pots showed that the alginate film containing ZnAl-NAA-LDH yields an enhancement regarding root area, fresh root matter and shoot length of plants. Thus, films produced from a mixture of alginate and the hybrid material containing the growth regulator intercalated into LDH can be a viable alternative to enhance plant development, which can be included in seed management.
41
Chroni, Angeliki, Aleksander Forys, Barbara Trzebicka, Adam Alemayehu, Vaclav Tyrpekl y Stergios Pispas. "Poly[oligo(ethylene glycol) methacrylate]-b-poly[(vinyl benzyl trimethylammonium chloride)] Based Multifunctional Hybrid Nanostructures Encapsulating Magnetic Nanoparticles and DNA". Polymers 12, n.º 6 (3 de junio de 2020): 1283. http://dx.doi.org/10.3390/polym12061283.
Texto completoResumen
We report on the preparation of novel and multifunctional hybrid spherical-shaped nanostructures involving a double-hydrophilic block copolymer, namely the neutral cationic poly[oligo(ethylene glycol) methacrylate]-b-poly[(vinyl benzyl trimethylammonium chloride)] (POEGMA-b-PVBTMAC) diblock copolymer, initially complexed with hydrophilic anionic magnetic nanoparticles (MNPs), and subsequently, with short deoxyribonucleic acid (113 bases DNA). The POEGMA-b-PVBTMAC copolymer, the copolymer/MNPs and the copolymer/MNPs/DNA tricomponent hybrid electrostatic complexes were studied by dynamic/electrophoretic light scattering (DLS/ELS) and cryogenic transmission electron microscopy (cryo-TEM) techniques for the determination of their structure and solution properties. The MNPs were complexed efficiently with the oppositely charged diblock chains, leading to well-defined hybrid organic–inorganic spherical-shaped nanostructures. A significant aggregation tendency of the MNPs is noticed in cryo-TEM measurements after the electrostatic complexation of DNA, implying an accumulation of the DNA macromolecules on the surface of the hybrid tricomponent complexes. Magnetophoretic experiments verified that the MNPs maintain their magnetic properties after the complexation initially with the copolymer, and subsequently, within the block polyelectrolyte/MNPs/DNA nanostructures.
42
Dehnavi, S. y Y. Maghsoudi. "A HYBRID METHOD IN VEGETATION HEIGHT ESTIMATION USING POLINSAR IMAGES OF CAMPAIGN BIOSAR". ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-1-W5 (10 de diciembre de 2015): 141–46. http://dx.doi.org/10.5194/isprsarchives-xl-1-w5-141-2015.
Texto completoResumen
Recently, there have been plenty of researches on the retrieval of forest height by PolInSAR data. This paper aims at the evaluation of a hybrid method in vegetation height estimation based on L-band multi-polarized air-borne SAR images. The SAR data used in this paper were collected by the airborne E-SAR system. The objective of this research is firstly to describe each interferometry cross correlation as a sum of contributions corresponding to single bounce, double bounce and volume scattering processes. Then, an ESPIRIT (Estimation of Signal Parameters via Rotational Invariance Techniques) algorithm is implemented, to determine the interferometric phase of each local scatterer (ground and canopy). Secondly, the canopy height is estimated by phase differencing method, according to the RVOG (Random Volume Over Ground) concept. The applied model-based decomposition method is unrivaled, as it is not limited to specific type of vegetation, unlike the previous decomposition techniques. In fact, the usage of generalized probability density function based on the nth power of a cosine-squared function, which is characterized by two parameters, makes this method useful for different vegetation types. Experimental results show the efficiency of the approach for vegetation height estimation in the test site.
43
Liang, Jintao, Shengdun Zhao, Yongqiang Zhao y Muzhi Zhu. "Hybrid-loop servo control system of double toggle mechanical press for flexible forming process based on sliding mode control and neural network techniques". Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 230, n.º 1 (23 de octubre de 2015): 35–45. http://dx.doi.org/10.1177/0959651815610272.
Texto completo
44
Karampatea, Apostolia y Katherine Siakavara. "Analysis and Synthesis of Double Negative Dielectric Media Rectenna Systems for Ambient Microwave Energy Harvesting". International Journal of Antennas and Propagation 2018 (2018): 1–13. http://dx.doi.org/10.1155/2018/2472738.
Texto completoResumen
The concept of harvesting the ambient electromagnetic radiation energy, coming from public telecommunication wireless networks, has been recently subject of extensive research. Techniques proposed for this target use mainly antennas, as the grade gathering the radiation power. In this work, a method introducing the usage of specific dielectric structures with artificially negative electric permittivity and magnetic permeability (double negative media or DNG) in combination with wire dipole antenna sensors is proposed as an RF harvesting system. Theoretical study of the synthesized DNG medium’s performance and the distribution of the electromagnetic field in its interior is made, with the intention of finding the areas of maximum electric field intensity at which the antenna sensors would be positioned for maximum power scavenging. The received numerical results show that the synthesized schemes are capable of enhancing the energy gathering ability. Compared to the same antenna sensors positioned in free space, they ensure higher input voltage to the rectifier and also an increase of the available power about 10 dB. Moreover, they exhibit this performance for every direction of arrival of the incoming waves. The hybrid schemes DNG dipole antenna were designed for the Universal Mobile Telecommunication System (UMTS) frequency band, but the method is general and would be applied to any other frequency band and also with other antenna types.
45
Komulainen, J., R. S. Laitinen y R. J. Suontamo. "A theoretical study of the 77Se NMR and vibrational spectroscopic properties of SenS8n ring molecules". Canadian Journal of Chemistry 80, n.º 11 (1 de noviembre de 2002): 1435–43. http://dx.doi.org/10.1139/v02-153.
Texto completoResumen
The structures and spectroscopic properties of SenS8n ring molecules have been studied by the use of ab initio molecular orbital techniques and density functional techniques involving Stuttgart relativistic large core effective core potential approximation with double zeta basis sets for valence orbitals augmented by two polarization functions for both sulfur and selenium. Full geometry optimizations have been carried out for all 30 isomers at the Hartree-Fock level of theory. The optimized geometries and the calculated fundamental vibrations and Raman intensities of the SenS8n molecules agree closely with experimental information where available. The nuclear magnetic shielding tensor calculations have been carried out by the Gauge-independent atomic orbital method at the DFT level using Becke's three-parameter hybrid functional with Perdew/Wang 91 correlation. The isotropic shielding tensors correlate well with the observed chemical shift data. The calculated chemical shifts provide a definite assignment of the observed 77Se NMR spectroscopic data and can be used in the prediction of the chemical shifts of unknown SenS8n ring molecules.Key words: selenium sulfides, ab initio, DFT, effective core potentials, geometry optimization, energetics, fundamental vibrations, 77Se chemical shifts.
46
Gopala, Venu Madhav y Obulesu Y.P. "A New Hybrid Artificial Neural Network Based Control of Doubly Fed Induction Generator". International Journal of Electrical and Computer Engineering (IJECE) 5, n.º 3 (1 de junio de 2015): 379. http://dx.doi.org/10.11591/ijece.v5i3.pp379-390.
Texto completoResumen
In this paper, Hybrid Artificial Neural Network (ANN) with Proportional Integral (PI) control technique has been developed for Doubly Fed Induction Generator (DFIG) based wind energy generation system and the performance of the system is compared with NN and PI control techniques. With the increasing use of wind power generation, it is required to instigate the dynamic performance analysis of Doubly Fed Induction Generator under various operating conditions. In this paper, three control techniques have been proposed, the first one is using PI controller, the second one is ANN control, and the third one is based on combination of ANN and PI. The performance of the proposed control techniques is demonstrated through the results, determined by using MATLab/Simulink. From the results it is observed that the dynamic performance of the DFIG is improved with the Hybrid control technique.
47
Latif, Abdul, S. M. Suhail Hussain, Dulal Chandra Das y Taha Selim Ustun. "Design and Implementation of Maiden Dual-Level Controller for Ameliorating Frequency Control in a Hybrid Microgrid". Energies 14, n.º 9 (23 de abril de 2021): 2418. http://dx.doi.org/10.3390/en14092418.
Texto completoResumen
It is known that keeping the power balance between generation and demand is crucial in containing the system frequency within acceptable limits. This is especially important for renewable based distributed hybrid microgrid (DHμG) systems where deviations are more likely to occur. In order to address these issues, this article develops a prominent dual-level “proportional-integral-one plus double derivative {PI−(1 + DD)} controller” as a new controller for frequency control (FC) of DHμG system. The proposed control approach has been tested in DHμG system that consists of wind, tide and biodiesel generators as well as hybrid plug-in electric vehicle and an electric heater. The performance of the modified controller is tested by comparing it with standard proportional-integral (PI) and classical PID (CPID) controllers considering two test scenarios. Further, a recently developed mine blast technique (MBA) is utilized to optimize the parameters of the newly designed {PI − (1 + DD)} controller. The controller’s performance results are compared with cases where particle swarm optimization (PSO) and firefly (FF) techniques are used as benchmarks. The superiority of the MBA-{PI − (1 + DD)} controller in comparison to other two strategies is illustrated by comparing performance parameters such as maximum frequency overshoot, maximum frequency undershoot and stabilization time. The displayed comparative objective function (J) and JFOD index also shows the supremacy of the proposed controller. With this MBA optimized {PI − (1 + DD)} controller, frequency deviations can be kept within acceptable limits even with high renewable energy penetration.
48
Jabbar, Ansam S. "Hybrid PSO-RBFNN and Proposed Algorithms of DDDWT for the Heart Disease Classification". Engineering and Technology Journal 39, n.º 4A (25 de abril de 2021): 520–27. http://dx.doi.org/10.30684/etj.v39i4a.1498.
Texto completoResumen
This paper introduced a Particle Swarm Optimization-Radial Basis Function Neural Networks (PSO-RBFNN)-based system for heart disease detection that used the PSO algorithm to optimize RBFNN parameters. The newly developed signal digital algorithm presents the results of a new image contrast enhancement approach using Double Density Discrete Wavelet transform DDDWT for extraction of features, using adaptive DDDWT for the elimination of noise, and the use of PSO and ANN methods to classify the output from the Electrocardiogram (EGGS). It also provides identification of all techniques and MATLAB codes used to improve the processes. This approach merged the global search power of the PSO algorithm with the high efficiency of RBFNN's local optimums, overcome the inconsistency of the PSO algorithm and the RBFNN downside, quickly leading to a local minimum. The results show that, as compared to other approaches, the PSO-RBFNN model of heart disease diagnosis is highly accurate in detecting and predicting.
49
Resseguie, James. "A Glossary of New Testament Narrative Criticism with Illustrations". Religions 10, n.º 3 (21 de marzo de 2019): 217. http://dx.doi.org/10.3390/rel10030217.
Texto completoResumen
This is the first stand-alone glossary of New Testament narrative-critical terms in the English language. It is an alphabetical listing of prominent terms, concepts, and techniques of narrative criticism with illustrations and cross-references. Commonly used terms are defined and illustrated, these include character, characterization, double entendre, misunderstanding, implied author, implied reader, irony, narrator, point of view, plot, rhetoric, and other constitutive elements of a narrative. Lesser-known terms and concepts are also defined, such as carnivalesque, composite character, defamiliarization, fabula, syuzhet, hybrid character, MacGuffin, masterplot, primacy/recency effect, and type-scene. Major disciplines—for example, narratology, New Criticism, and reader-response criticism—are explained with glances at prominent literary critics/theorists, such as Aristotle, Mikhail Bakhtin, Wayne Booth, Seymour Chatman, Stanley Fish, E. M. Forster, Gérard Genette, Wolfgang Iser, and Susan Sniader Lanser.
50
Sarigiannidis, Athanasios, Minos Beniakar y Antonios Kladas. "Computationally efficient permanent magnet traction motor loss assessment". COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, n.º 6 (5 de noviembre de 2018): 2093–108. http://dx.doi.org/10.1108/compel-08-2017-0326.
Texto completoResumen
Purpose This paper aims to introduce a computationally efficient hybrid analytical–finite element (FE) methodology for loss evaluation in electric vehicle (EV) permanent magnet (PM) traction motor applications. In this class of problems, eddy current losses in PMs and iron laminations constitute an important part of overall drive losses, representing a key design target. Design/methodology/approach Both surface mounted permanent magnet (SMPM) and double-layer interior permanent magnet (IPM) motor topologies are considered. The PM eddy losses are calculated by using analytical solutions and Fourier harmonic decomposition. The boundary conditions are based on slot opening magnetic field strength tangential component in the air gap in the SMPM topology case, whereas the numerically evaluated normal flux density variation on the surface of the outer PM is implemented in the IPM case. Combined analytical–loss evaluation technique has been verified by comparing its results to a transient magnetodynamic two-dimensional FE model ones. Findings The proposed loss evaluation technique calculated the total power losses for various operating conditions with low computational cost, illustrating the relative advantages and drawbacks of each motor topology along a typical EV operating cycle. The accuracy of the method was comparable to transient FE loss evaluation models, particularly around nominal speed. Originality/value The originality of this paper is based on the development of a fast and accurate PM eddy loss model for both SMPM and IPM motor topologies for traction applications, combining effectively both analytical and FE techniques.