Qiao, XuanlinRomanova, Galina E.Zhukova, Tatiana I.
7页
查看更多>>摘要：The method was proposed choosing the initial construction and for the design of collimation and side-emitting lenses which includes the lens profile generating on the base of the conic curves using simple theoretical expressions from the third-order aberration theory. Compared to the other methods, this one gives the possibility to evaluate the necessary size and basic parameters of conic curves without any time-consuming procedures. In the paper, the accuracy of the solutions obtained on the basis of aberration theory has been analyzed from the viewpoint of lens efficiency and the forming surfaces' shape both for different lens types and extended LED sources. The goal of the work was in researching how close to the more exact configuration the proposed solution was obtained using optimization technique. For different cases of lens size and lens dimensions, we have demonstrated that the deviation of the lens profile is comparable to the surface manufacturing accuracy. Thus, the method using aberration theory provides a basis for the fast automatic and visual tool for designing illumination lenses.
查看更多>>摘要：The optical absorption coefficients (OACs) and refractive index changes (RICs) in the GaAs/Ga1-x AlxAs spherical quantum dots (QDs) under Hulthen plus Hellmann confining potential have been investigated by adjusting the structural parameters with the applied tuning elements. Energy levels and wavefunctions of this system have been determined by means of the Nikiforov- Uvarov (NU) method. Expressions for the OACs and RICs are derived by the density matrix method. We display that both the radius of QDs and the depth of the Hulthen plus Hellmann confining potential have a significant impact on OACs and RICs. Furthermore, we can draw conclusions that the applied tuning elements can manage the amplitudes and resonances frequency of the OACs and RICs.
查看更多>>摘要：Based on the contributions of Phosphorus and its compound species are great advances in photocatalytic degradation performance. In this article, pure and P doped MnO2 nanoparticles were synthesized by the hydrothermal method. The evenly distributed Phosphorus has good contact with MnO2. The findings of the XRD diffraction validated the synthesis of a well-defined tetragonal phase of pure and P doped MnO2. The bonding of functional groups Phosphorus band is strongly related to the Phosphorus-oxy compound (P-O-C) confirmed by Fourier transform infrared spectroscopy (FTIR) analysis. Morphology of pure and P doped MnO2 was studied using scanning electron microscopy (SEM) and Field emission scanning electron microscopy (FESEM). The existences of all component atoms in the crystal structure of all samples are verified using energy-dispersive X-ray spectroscopy (EDX).UV-visible diffuse reflectance spectroscopy (UV-Vis DRS) was used to characterize bandgap values. The bandgap values of pure and 2%, 4%, 6% of P doped MnO2 are 2.61 eV and 2.19 eV, 2.10 eV, 1.90 eV, respectively. They confirmed the bandgap values decreases by increasing the percentage of P dopant. The photocatalytic performance of all pure and P doped MnO2 samples are investigated utilizing photodegradation of MO and RhB dyes in the sight of sunshine. Trapping experiments confirmed the dyes sensitization photodegradation is eliminated by active photodegradation, such as TEOA, Ag(NO)(3), IPA, and BQ, which represents photogenerated h(+), e(-) , center dot OH, and O-2(-) created and active during photocatalytic degradation procedure were enhanced. The photocatalytic activity of pure and P doped MnO2 nanoparticles show the degradation efficiency of MO and RhB dyes at 85% and 90%, respectively. Furthermore, P/MnO2 doping was effectively utilized for five photodegradation cycles without a significant change in activity, and crystalline characteristics. Moreover, the mechanism of catalytic performance enhancement also has been discussed. These nanoparticle materials are the potential candidates for high-performance photocatalytic application.
Alharshan, Gharam A.Alrowaili, Z. A.Olarinoye, I. O.Al-Buriahi, M. S....
9页
查看更多>>摘要：Glasses are versatile materials whose uses span across a wide technological spectrum. The application of glasses in radiation protection directly depends on their chemical description. In the present study, we investigate the influence of Ho2O3 on the gamma-ray shielding performance of P2O5-B2O3-ZnSO4 glasses for selected gamma energies between 0.284 and 2.506 MeV. Three glass samples with the chemical composition: (40-x)P2O5 + 30B2O3 + 30ZnSO4 + xHo2O3, where x = 0.0, 0.5, and 1.0 mol% represents PBZH1-3 accordingly. The computation of the photon shielding parameters started with photon transmission simulation using GEANT4 simulation code and validated by XCOM. The mass attenuation coefficient MAC obtained via both methods were very close with deviations between 0.72% and 1.79%. The MAC of the glasses varied from 0.039 to 0.109 cm2 g-1 for PBZH1, 0.039 to 0.111 cm2 g-1 for PBZH2, and 0.039 to 0.113 cm2 g-1 for PBZH3. The mass attenuation coefficient exhibits strong dependence on the energy of gamma-ray and the changes in the chemical composition of the glasses. The half value layer values of the PBZH1, and PBZH3 samples ranged from 2.21 cm to 6.22 cm and 2.00 cm to 5.87 cm, respectively. The values of the effective atomic number for PbZH3 ranged from 10.80 to 10.30 within the selected incident photon energy. On the other hand, the effective atomic number of PbZH1 samples ranged from 10.29 to 10.19. Generally, PbZH samples with higher Ho2O3 content gave a composition with higher density, linear attenuation coefficient, and effective atomic number; but lower half value layer and mean free path within photons with energies of 0.284-2.506 MeV. The PbZH glass samples had better shielding efficiencies than commercial RS253-G18 glass and ordinary concrete thus making them applicable for gamma-ray absorption purposes.
Arab, Alireza A.Rostami, Mohammad Javad B.Ghavami, Behnam
8页
查看更多>>摘要：Nowadays, as the science and technology are advanced, users are more willing to use the visual data and also such kind of data in medical and military applications. Therefore, unauthorized access to personal and confidential information has become a critical problem in today's digital world. Encryption is an appropriate method for fixing such problems. Due to high size of data and high correlation among the image's adjacent pixels, texts encryption algorithms are not good for image encryption. In designing an algorithm for the future generations, three principles should be met: firstly, algorithm should be so simple that it is evaluated and analyzed easily, accurately and completely. Secondly, an encryption algorithm should have a security margin much more than the required for current identified attacks. Thirdly, in design, the tools and ideas already known and reliable should be utilized as much as possible. Hence, in this paper, an image encryption algorithm is proposed by combination of two Henon chaos and Logistic systems. Experimental results confirm and demonstrate that the proposed method yields better outcomes in the field of security against the statistical and differential attacks compared to the original AES encryption algorithm and previous modified encryption algorithms.
Zayed, Elsayed M. E.Shohib, Reham M. A.Alngar, Mohamed E. M.Nofal, Taher A....
10页
查看更多>>摘要：The present work addresses, for the first time, the cubic-quartic optical solitons in magneto optic waveguides (MOW) for NLSE with Kudryashov's law (KL) arbitrary refractive index and generalized non-local laws of nonlinearity. Two integrative methods, namely, the modified Kudryashov's (MK's) methodology and the addendum to Kudryashov's (AK's) methodology are utilized. Many different pattern of soliton solutions are deduced such as dark, bright optical solutions, candid solutions and combo bright-singular (CBS) solutions.
查看更多>>摘要：We proposed and demonstrated a highly sensitive humidity sensor based on a fiber Mach-Zehnder Interferometer (MZI). This sensor is composed of a short section of tapered dual side-hole fiber (DSHF) sandwiched between two single mode fibers. At the tapered section, both the fundamental and higher order cladding modes are stimulated and interfere with each other, forming an inter-modal MZI. The existence of air holes in the DSHF makes the cladding mode more easily excited and has higher refractive index sensitivity. In addition, by coating graphene oxide (GO) film with large specific surface area on the tapered DSHF, the humidity sensitivity of the sensor has been further improved. Experimental results show that the humidity sensitivity of the sensor can reach -0.142 nm/%RH, which increased 7.9 times than that without GO coating. In addition, the rising and falling time of respiration were 0.23 s and 2.19 s, respectively. The excellent performance demonstrates it is a good candidate for humidity measurement.
查看更多>>摘要：A serious error exists in the above paper. The equation (7) in [1] is as follows d2y(t) dt2 + ?? dy(t) dt + ??y(t) = x(t) (1) where the functions x(t) and y(t) are the input and output signals. From figure 2 in [1] it is seen that the units of parameter ?? are meters(length). From figure 3 in [1] it is seen that the units of parameter ?? are also meters(length). From figure 4 in [1] it is seen that the units of parameter t are second(time). Thus the units of the terms in Eq. (1) are as follows d2y(t) dt2 : y(t)sec???2 ?? dy(t) dt : y(t)msec??? 1 ??y(t) : y(t)m In a Physics equation all terms must have the same units. For that reason the Eq. (1) is wrong. The entire work in [1] is based on Eq. (1). Taking into account that Eq. (1) is the basic equation in [1] it is obvious that all subsequent results are wrong. Superscript/Subscript Available</comment
查看更多>>摘要：The light-emitting electrochemical cells (LECs) have received extensive attention from researchers in recent years due to their simple single-layer structure, air-stable metal electrodes, and low manufacturing cost. So far, reports on the use of LEC active layer emitter materials have mainly focused on ionic transition metal complexes (iTMCs) and conjugated polymers (CPs). The application of the above materials in blue LECs is restricted due to high cost, complicated synthesis process, and poor stability, which results in the slow development of blue LECs. A novel blue LECs device based on aggregation-induced emission (AIE) small molecule (2,3-diphenylbenzo[b]thiophene S, S-sulfur dioxide, DP-BTO) with a peak luminance of 36.58 cd/m(2), a CEmax of 1.14 cd/A, and an EQEmax of 0.46% was reported in this work. The blue light emission centered at ~460 nm was exhibited at a voltage above 6 V. This work successfully constructed blue light-emitting LECs devices based on AIE materials, opening up a new research avenue for the application of AIE materials in the field of thin-film device development.
Bhoyar, Rajani A.Nayak, A. C.Wankhede, S. P.Belsare, P. D....
6页
查看更多>>摘要：New results on luminescence in Na3ScSi2O7 are reported. Bi3+ and Ce3+ were chosen as activators. A strong characteristic photoluminescence (PL) originating in transitions from the lowest energy state of 4 fn-15d1 configuration to the ground state of 4 f7/4 f1 configuration was observed for Ce3+. Bi3+ doped sample also showed characteristic emission attributable to P-3( 1) -> (1)So transition.
NSTL
Elsevier