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Search Results: 1 - 10 of 13133 matches for " LYNN KAAT LAURA KURNIAWAN "
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Heart Size Evaluation of Indonesian Domestic House Cat by Motion Mode Echocardiography Imaging
DENI NOVIANA,LYNN KAAT LAURA KURNIAWAN
HAYATI Journal of Biosciences , 2013,
Abstract: Indonesian Domestic House Cats (DHC) are prone to various diseases, especially cardiovascular diseases. Physical examination alone is not enough to differenciate cardiac diseases, which is why further screening tests such as heart ultrasonography-echocardiography are needed. Since there has been no information regarding the heart size of Indonesian DHC, the purpose of this study was to determine the heart size of an anesthetized Indonesian DHC through Motion mode echocardiography imaging. Nine male cats weighing between 3.3-3.4 kg were anesthetized using zolazepam-tiletamine. Echocardiographic examinations were taken on the right parasternal short axis view at the papillary muscle and aorta level using a 7.5 MHz transducer. Result showed that the wall thickness, left ventricular internal diameter and fractional shortening of the Indonesian DHC were similar compared with those in other cat breeds with the same average weight. The left atrium internal diameter and the aorta diameter of the Indonesian DHC were relatively smaller. However, the left atrium and aorta diameter ratio were similar to the result in other cat breeds with the same average weight. Through this study, we also could specify the left ventricular volume, stroke volume, cardiac output and ejection fraction that not yet reported before.
Muscle Activation Patterns When Passively Stretching Spastic Lower Limb Muscles of Children with Cerebral Palsy
Lynn Bar-On, Erwin Aertbeli?n, Guy Molenaers, Kaat Desloovere
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0091759
Abstract: The definition of spasticity as a velocity-dependent activation of the tonic stretch reflex during a stretch to a passive muscle is the most widely accepted. However, other mechanisms are also thought to contribute to pathological muscle activity and, in patients post-stroke and spinal cord injury can result in different activation patterns. In the lower-limbs of children with spastic cerebral palsy (CP) these distinct activation patterns have not yet been thoroughly explored. The aim of the study was to apply an instrumented assessment to quantify different muscle activation patterns in four lower-limb muscles of children with CP. Fifty-four children with CP were included (males/females n = 35/19; 10.8±3.8 yrs; bilateral/unilateral involvement n = 32/22; Gross Motor Functional Classification Score I–IV) of whom ten were retested to evaluate intra-rater reliability. With the subject relaxed, single-joint, sagittal-plane movements of the hip, knee, and ankle were performed to stretch the lower-limb muscles at three increasing velocities. Muscle activity and joint motion were synchronously recorded using inertial sensors and electromyography (EMG) from the adductors, medial hamstrings, rectus femoris, and gastrocnemius. Muscles were visually categorised into activation patterns using average, normalized root mean square EMG (RMS-EMG) compared across increasing position zones and velocities. Based on the visual categorisation, quantitative parameters were defined using stretch-reflex thresholds and normalized RMS-EMG. These parameters were compared between muscles with different activation patterns. All patterns were dominated by high velocity-dependent muscle activation, but in more than half, low velocity-dependent activation was also observed. Muscle activation patterns were found to be both muscle- and subject-specific (p<0.01). The intra-rater reliability of all quantitative parameters was moderate to good. Comparing RMS-EMG between incremental position zones during low velocity stretches was found to be the most sensitive in categorizing muscles into activation patterns (p<0.01). Future studies should investigate whether muscles with different patterns react differently to treatment.
Removal of Herbicides from Water Using Heterogeneous Photocatalysis Case Study: MCPA Sodium Monohydrate  [PDF]
Samer Khalaf, Jawad H. Shoqeir, Laura Scrano, Rafik Karaman, Sabino A. Bufo, Tonni Agustiono Kurniawan
Journal of Water Resource and Protection (JWARP) , 2019, DOI: 10.4236/jwarp.2019.118060
Abstract: In this study, the herbicide MCPA sodium salt monohydrate (sodium (4-chloro-2 methylphenoxy) acetate has been studied as are presentative compound used in the agricultural field. Accordingly, direct photolysis and photocatalytic experiments under artificial irradiation simulating solar light in laboratorial conditions were performed. Photocatalytic experiments were performed using TiO2 dispersed powder and as an immobilized thin layer on the surface of blue glasses. The obtained results of photolysis showed a poor efficacy toward degradation of MCPA sodium monohydrate, with half-life (t1/2) 6931.5 min. While, the addition of TiO2 dispersed powder to the photocatalytic process enhances the process dramatically with (t1/2) equal to 36.5 min; furthermore, complete mineralization had been reached after approximately 4 hours, whereas the addition of TiO2 through immobilized system led to enhance the degradation rate with 2236 min. as t1/2. In spite of this, using TiO2 supported on glass substrates with more improvements could be a promising alternative to conventional TiO2 suspension, and provides a clean treatment method.
Sensitivity Analysis of Flutter of A Two-Degree of Freedom Linear Aeroelastic System
Riccy Kurniawan
Jurnal Teknik Mesin , 2011,
Abstract: This paper deals with the problem of the aeroelastic stability of a typical aerofoil section with two degrees of freedom induced by unsteady aerodynamic loads. A method is presented to model the unsteady lift and pitching moment acting on a two dimensional typical aerofoil section, operating under attached flow conditions in an incompressible flow. Starting from suitable generalisations and approximations to aerodynamic indicial functions, the unsteady loads due to an arbitrary forcing are represented in a state-space form. From the resulting equations of motion, the flutter speed is computed through stability analysis of a linear state-space system. The sensitivity analysis of the aeroelastic stability boundaries to the structural parameter is evaluated. The results show that the parameter with the greatest influence on flutter speed is the center of gravity.
The Occurrence of Hyperhydricity on Several Carnations (Dianthus carryophyllus L.) Cultivars during Low Temperature Storage
KURNIAWAN BUDIARTO
Biodiversitas , 2009,
Abstract: The incident of hyperhydricity was a common problem in propagated carnation (Dianthus carryophyllus L.) during in vitro culture. Due to its possible relations with the decrease in phenotypic performance of plantlets, the observation on the occurrence of hyperhydricity was conducted on several in vitro conserved carnation cultivars. The research was conducted from July 2007 to August 2008 at The Indonesian Ornamental Crops Research Institute, Cianjur, West Java. A complete factorial experiment with 24 replications was designed to accomplish the combination of two factors. The first factor was six commercial carnation cultivars, namely light pink candy, malaga, opera, white candy, liberty and pink maladi, while the seconds dealt with type of conservation media, i.e. MS+DMSO 3%, MS+DMSO 3%+3% sucrose and control ( MS+3% sucrose). The results showed that the percentage of hyperhydric plantlet and plantlet viability after in vitro conservation were varied among carnation cultivars. Single treatment of sucrose had the least capacity in inducing plantlet resistance to low temperature conditions during in vitro conservation. Supplemental DMSO postponed the occurrence of hyperhydricity and with the existence of sucrose, higher plantlet viability were achieved.
SPECTRAL QUALITY AFFECTS MORPHOGENESIS ON ANTHURIUM PLANTLET DURING IN VITRO CULTURE
Kurniawan Budiarto
Agrivita : Journal of Agricultural Science , 2010,
Abstract: This paper elucidates the effects of LEDs spectral on callus induction, proliferation and shoot development of anthurium plantlet derived from leaf explants. The research was conducted at the Ornamental Research Station, Fukuyama, Japan from January to August 2008. Three experimental series were designed to determine the effects of LED-based spectral compositions i.e. 100% red, 75% red + 25% blue, 50% red + 50% blue, 25% red + 75% blue and 100% blue LEDs on morphogenetic process of callus formation derived from leaf explants up to plantlet formation on two anthurium cultivars, Violeta and Pink Lady. The results showed no differences among cultivars tested but interaction of factors studied were found in all parameters observed. LEDs spectral gave significant influence on the morphogenetic processes from callus induction to complete plantlet formation. Progressive initial callus was promoted with the decrease of blue LEDs portion. Conversely, to proliferate globose to torpedo callus formation, more blue light was required than red LEDs. During shoot induction and formation, hastened shoot initiation and number of shoots were achieved in higher blue LEDs portions, but not in root formations.
ALTERNATIVE IN VITRO MEDIA FOR MEDIUM-TERM CONSERVATION OF CHRYSANTHEMUM (Dendranthema grandiflora Tvelve)
Kurniawan Budiarto
Bumi Lestari , 2009,
Abstract: Sufficient genetic diversity and gene pool conservation are needed to serve breeding activities of chrysanthemum. In the tropics, in vitro conservation was expected to be a breakthrough in alleviating the limitation of in vivo methods. A previous study using osmotic pressure methods in low temperature has successfully preserved chrysanthemum via in vitro for medium-term conservation. Modified nutrient compositions were also predicted to have the same impact as far as these concerned. The research was then, conducted to evaluate in vitro conservation of chrysanthemum using media modification in low temperature. The research was carried out on the Indonesian Ornamental Crops Research Institute (IOCRI) from January, 2007 to March, 2008. A randomized completely block design with 25 replications was utilized to accomplish the combination of two factors. The first factor was six commercial chrysanthemum cultivars, namely cv. Puma, cv. Kermit, cv. Town Talk, cv. Snowdown, cv. Yellow Fiji and cv. Saraswati. While the second factor dealt with four formulations of conservation media i.e. MS + DMSO 2,5 % + 4 % sucrose, modified hyponex + 4 % sucrose, modified hyponex (no sucrose) and MS + 4 % sucrose (control). The results showed that the medium term of in vitro conservation for chrysanthemum were successfully conducted up to 12 months using MS + DMSO 2,5 % + 4 % sucrose and modified hyponex + 4 % sucrose without any significant differences and decreases in viability when transferred in to shoot induction media. In the absent of sucrose, however, the planlet survival rates decreased on the media of modified hyponex after 8 months of storage. No significant variation was observed among the chrysanthemum accessions tested.
PENGETAHUAN, SIKAP DAN PERILAKU WISATAWAN YANG TERINFEKSI MALARIA TENTANG PENCEGAHAN DAN PENGOBATAN MALARIA
Liliana Kurniawan
Bulletin of Health Research , 2012,
Abstract: PENGETAHUAN, SIKAP DAN PERILAKU WISATAWAN YANG TERINFEKSI MALARIA TENTANG PENCEGAHAN DAN PENGOBATAN MALARIA
Numerical Study of Flutter of a Two-Dimensional Aeroelastic System
Riccy Kurniawan
ISRN Mechanical Engineering , 2013, DOI: 10.1155/2013/127123
Abstract: This paper deals with the problem of the aeroelastic stability of a typical aerofoil section with two degrees of freedom induced by the unsteady aerodynamic loads. A method is presented to model the unsteady lift and pitching moment acting on a two-dimensional typical aerofoil section, operating under attached flow conditions in an incompressible flow. Starting from suitable generalisations and approximations to aerodynamic indicial functions, the unsteady loads due to an arbitrary forcing are represented in a state-space form. From the resulting equations of motion, the flutter speed is computed through stability analysis of a linear state-space system. 1. Introduction Flutter is the dynamic aeroelasticity phenomenon whereby the inertia forces can modify the behaviour of a flexible system so that energy is extracted from the incoming flow. The flutter or critical speed is defined as the lowest air speed at which a given structure would exhibit sustained, simple harmonic oscillations. represents the neutral stability boundary: oscillations are stable at speeds below it, but they become divergent above it. Theodorsen [1] obtained closed-form solution to the problem of an unsteady aerodynamic load on an oscillating aerofoil. This approach assumed the harmonic oscillations in inviscid and incompressible flow subject to small disturbances. Wagner [2] obtained a solution for the so-called indicial lift on a thin aerofoil undergoing a transient step change in angle of attack in an incompressible flow. The indicial lift response makes a useful starting point for the development of a general time domain unsteady aerodynamics theory. A practical way to tackle the indicial response method is through a state-space formulation in the time domain, as proposed, for instance, by Leishman and Nguyen [3]. The main objective of this paper is to investigate the aeroelastic stability of a typical aerofoil section with two degrees of freedom induced by the unsteady aerodynamic loads defined by the Leishman’s state-space model. 2. Aeroelastic Model Formulation The mechanical model under investigation is a two-dimensional typical aerofoil section in a horizontal flow of undisturbed speed , as shown in Figure 1. Its motion is defined by two independent degrees of freedom, which are selected to be the vertical displacement (plunge), , positive down, and the rotation (pitch), . The structural behaviour is modelled by means of linear bending and torsional springs, which are attached at the elastic axis of the typical aerofoil section. The springs in the typical aerofoil section
Coupling Analysis of Electromagnetic Field Transverse Magnetic (TM) on 2D Photonic Crystals with Symmetrical Refractive Index Defect Using Tensor Green Method
Candra Kurniawan
Physics , 2011,
Abstract: Photonic crystal is a dielectric material which has a refractive index or permittivity which vary periodically, thus preventing the propagation of light with specific frequency and direction. The frequency range is called a photonic bandgap (PBG). If the structure of photonic crystals is modified by taking one line of rod in a photonic crystal is obtained a waveguide. Giving structures with symmetrical defects around the waveguide channel with the parameters given occurs coupling between the waveguide and cavity. Coupling indicates transfer part or all of the EM field depends on the frequency of EM field in the photonic crystal. Green tensor method can be used to calculate the total electric field in a 2D photonic crystal. With the aid of MATLAB programs can be shown to the powerful visualization calculation of the total electrical field in 2D photonic crystals. Based on analysis of the literature and the bandgap graphic and the field energy in the defects show that effective frequency which produces maximum energy when coupling occur was in the mid-bandgap frequency interval.
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