In this paper, we prove the global existence of Maxwell Klein Gordon equation (MKG) with the addition of general couplings in 4-dimensional Minkowski space. It is well known that the MKG system is ...globally well-posed in consideration of the Coulomb gauge condition for finite energy, while here we use the temporal gauge condition to prove its existence. The result shows that the solution does not blow up in finite time. For complete proof of global existence, we show that (H2 × H1) norm in the form of "modification of energy" is not also blow up in finite time.
Snakes on Lieb lattice Kusdiantara, R.; Akbar, F. T.; Nuraini, N. ...
Journal of nonlinear science,
08/2022, Letnik:
32, Številka:
4
Journal Article
Recenzirano
We consider the discrete Allen–Cahn equation with cubic and quintic nonlinearity on the Lieb lattice. We study localized nonlinear solutions of the system that have linear multistability and ...hysteresis in their bifurcation diagram. In this work, we investigate the system’s homoclinic snaking, i.e. snaking-like structure of the bifurcation diagram, particularly the effect of the lattice type. Numerical continuation using a pseudo-arclength method is used to obtain localized solutions along the bifurcation diagram. We then develop an active-cell approximation to classify the type of solution at the turning points, which gives good agreement with the numerical results when the sites are weakly coupled. Time dynamics of localized solutions inside and outside the pinning region is also discussed.
The growth of particleboard production is parallel with the growth of world population. Yet, supply on wood chips as raw material for particleboard facing the shortage. Indonesia as a tropical ...country has various source of renewable resources, including agricultural residuals and non-wood forest product. This research was conducted to investigate the properties of particleboard made from core and rattan bark, from corn stalk and wood waste. Particles with moisture content less than 5% were mixed with adhesive. Phenol formaldehyde (PF) 10% was used as the adhesive. Mixed particles were then hot pressed for 10 minutes at 150°C with 25 Kgf/cm2. Targeted density of the board was 0.7 g/cm3. Prior to testing, boards were conditioned for seven days at room temperature. Testing was conducted for physical and mechanical properties as well as the surface roughness. Standard for physical and mechanical properties reffered to the JIS A 5908-2003. Results show that the particleboard from corn stalk had the lowest thickness swelling which was 16.7%. The highest modulus of rupture was given by particleboard from wood waste which was 21.69 MPa.
Zinc oxide (ZnO) nanoparticles (NPs) were synthesized hydrothermally and doped with 4% Neodymium (Nd). The produced NPs were characterized using UV–Vis spectroscopy, X-ray diffraction (XRD), Energy ...dispersive X-ray analysis, Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Thermogravimetric analysis (TGA) and Photoluminescence (PL) spectroscopy. With the addition of 4% Nd, the bandgap reduced from 3.20 to 3.00 eV which confirmed successful doping with Nd which also evident from FTIR study. The XRD study showed hexagonal structure of the synthesized material, while SEM study confirmed that Nd-doped ZnO (Nd–ZnO) NPs are well dispersed as compare to ZnO. TGA study revealed that synthesized NPs were much stable to temperature and only 11.3% and 7.2% the total loss occurred during heating range (40–600 °C) in case of ZnO and Nd–ZnO NPs, respectively. The PL intensity of the visible peaks of ZnO reduced after doping with Nd. The degradation of Acid yellow-3 over both the catalysts followed first-order kinetics. The activation energy calculated for the photodegradation reaction was 43.8 and 33.7 kJ/mol using pure ZnO and Nd–ZnO NPs, respectively. About 91% and 80% dye was degraded at the time interval of 160 min using Nd–ZnO and ZnO NPs, respectively. High percent degradation of dye was found at low concentration (10 ppm) and at optimal dosage (0.035 g) of the catalyst. The rate of Acid yellow-3 dye degradation was found to increase with increase in temperature (up to 50 °C) and pH(8) of the medium. The recyclability study showed that both pure ZnO and Nd–ZnO NPs could be reused for the degradation of the given dye. With the addition of H
2
O
2
up to 5 µL, the rate of reaction increased clearly indicating the effect of OH
·
generation during photocatalysis. When compared with Nd–ZnO NPs at low concentrations, ZnO NPs at higher concentrations were found to be less hazardous. Both the NPs showed best antibacterial activities against
Staphylococcus aureus
. The hemolytic study indicated that at low concentration, pure ZnO was non-hemolytic as compared to Nd–ZnO.
Hijaiyah alphabet is letters used in the Qur'an. An attractive and exciting learning process of Hijaiyah alphabet is necessary for the children. One of the alternatives to create attractive and ...interesting learning process of Hijaiyah alphabet is to develop it into a mobile application using augmented reality technology. Augmented reality is a technology that combines two-dimensional or three-dimensional virtual objects into actual three-dimensional circles and projects them in real time. The purpose of application aims to foster the children interest in learning Hijaiyah alphabet. This application is using Smartphone and marker as the medium. It was built using Unity and augmented reality library, namely Vuforia, then using Blender as the 3D object modeling software. The output generated from this research is the learning application of Hijaiyah letters using augmented reality. How to use it is as follows: first, place marker that has been registered and printed; second, the smartphone camera will track the marker. If the marker is invalid, the user should repeat the tracking process. If the marker is valid and identified, the marker will have projected the objects of Hijaiyah alphabet in three-dimensional form. Lastly, the user can learn and understand the shape and pronunciation of Hijaiyah alphabet by touching the virtual button on the marker
In this paper, we study about the wellposedness of scalar wave equation on Robertson-Walker universe as a background with zero spatial curvature, k = 0. We start from non-minimal Lagrangian for ...scalar field on curved background with potential turned on. Then we derive the equations of motion and tensor energy-momentum. After that we specify our case to k = 0. Finally, we prove the local existence and uniqueness of the solution of the equation of motion.
The 2018 United-Network-for-Organ-Sharing (UNOS) allocation-system changes resulted in greater recognition of mechanical circulatory support (MCS), leading to more heart transplantations (HTx) in ...patients with MCS. We aimed to investigate the effect of the new UNOS allocation system on the need for a permanent pacemaker and associated complications following HTx.
The UNOS Registry was questioned, to identify patients that received HTx in the US between 2000 and 2021. The primary objectives were to identify risk factors for the need for a pacemaker implantation following HTx.
49,529 HTx patients were identified, 1421 (2.9%) requiring a pacemaker post-HTx. Patients who required a pacemaker were older (53.9 ± 11.5 vs. 52.6 ± 12.8 years,
< 0.001), more frequently white (73% vs. 67%;
< 0.001) and less frequently black (18% vs. 20%;
< 0.001). In the pacemaker group, UNOS status 1A (46% vs. 41%;
< 0.001) and 1B (31% vs. 27%;
< 0.001) were more prevalent, and donor age was higher (34.4 ± 12.4 vs. 31.8 ± 11.5 years;
< 0.001). One-year survival was no different between the groups (HR: 1.08; 95% CI: 0.85, 1.37;
= 0.515). An era effect was observed (per year: OR: 0.97; 95% CI: 0.96, 0.98;
= 0.003), while ECMO pre-transplant was associated with lower risk of a pacemaker (OR: 0.41; 95% CI: 0.19, 0.86;
< 0.001).
While associated with various patient and transplant characteristics, pacemaker implantation does not seem to impact one-year survival after HTx. The need for pacemaker implantation was lower in the more recent era and in patients who required ECMO pre-transplant, a finding explained by recent advances in perioperative care.
.
With the availability of high luminosity electron beams at the accelerators, there is now the possibility of studying weak quasielastic hyperon production off the proton,
i.e.
e
-
p
→
ν
e
Y
(
Y
=
Λ
...,
Σ
0
)
, which will enable the determination of the nucleon-hyperon vector and axial-vector transition form factors at high
Q
2
in the strangeness sector and provide test of the Cabibbo model, G-invariance, CVC, PCAC hypotheses and
SU
(3) symmetry. In this work, we have studied the total cross section, differential cross section as well as the longitudinal and perpendicular components of polarization of the final hyperons (
Λ
and
Σ
0
produced in these reactions) and presented numerical results for these observables and their sensitivity to the transition form factors.
The present study aims to evaluate the prevalence and antimicrobial sensitivity of Staphylococcus aureus associated with bovine mastitis to selected antibiotics and plant extracts. In the current ...study, 140 milk samples were collected from cows and buffaloes. Among the 140 samples, 93 samples were positive for sub-clinical mastitis based on the California Mastitis Test (CMT). Out of the total positive samples, 45 were confirmed for S. aureus on a Mannitol salt agar media. The antimicrobial susceptibility test revealed that 44.82% of the isolates were resistant to cefoxitin (oxacillin) confirming methicillin-resistant S. aureus (MRSA) with a higher percentage (51.61%) in the buffalo than in the cow samples. Furthermore, the PCR assay confirmed the presence of the mecA gene in all the MRSA isolates. Among the seven tested antibiotics, sulfamethoxazole + trimethoprim showed high efficacy (71.1%) against methicillin-susceptible S. aureus isolates (MSSA). Oxytetracycline and sulfamethoxazole + trimethoprim showed 20% efficacy against MRSA followed by enrofloxacin (10%). On the other hand, the tested samples from Pistacia chinensis revealed that the ethyl acetate extract of bark showed a maximum zone of inhibition of 21.3 mm against MSSA and MRSA isolates at 3 000 μg/disc. Moreover, the methanol extract of Cotoneaster microphyllus formed a 12.3 mm and 9.1 mm zone of inhibition against the MSSA and MRSA isolates, respectively.
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