Basis sets for light-matter interaction: from static coherent states to moving Gaussians

This thesis develops a computationally efficient way of employing Gaussian wave packets to study laser-induced electron dynamics in atomic and molecular systems by directly solving the time-dependent Schrödinger equation (TDSE). First, we investigate charge migration (treating the nuclei classically), high-order harmonic generation (HHG), and single-isolated attosecond pulse generation in the Hydrogen molecular ion subjected to intense laser fields in a different range of frequencies with a basis of static coherent states (SCS). Then, seeking for a smarter way of constructing and guiding a minimal set of time-dependent basis functions, we introduce a fast and accurate approach for optimizing s-type Gaussian type orbitals (GTOs) and apply it to calculate electronic states of different 1D and 3D time-independent systems. Finally, we apply our optimization approach to time-dependent problems. With our approach we obtain excellent agreement with the exact results for HHG spectra of the 1D Hydrogen atom and molecular ion exposed to intense laser fields, which is not possible even with a much larger basis of static s-type GTOs.Diese Arbeit sucht nach einem computereffizienten Ansatz für die Verwendung von Gaußschen Wellenpaketen zur Untersuchung der Quantenelektronendynamik in atomaren und molekularen laserinduzierten Systemen durch direkte Lösung der zeitabhängigen Schrödingergleichung (TDSE). Beginnend mit statischen kohärenten Zuständen (SCS) untersuchen wir die Ladungsmigration (wobei wir die Kerne klassisch behandeln), die Erzeugung von Oberwellen höherer Ordnung (HHG) und die Erzeugung von isolierten Attosekundenimpulsen im 3D-Wasserstoffmolekül-Ion \ih, das intensiven Laserfeldern in einem unterschiedlichen Frequenzbereich ausgesetzt ist. Auf der Suche nach einer intelligenteren Methode zur Konstruktion und Führung eines minimalen Satzes von Basisfunktionen stellen wir einen schnellen und genauen Ansatz zur Optimierung von Gauß-Orbitalen (GTOs) vom s-Typ vor und wenden ihn erfolgreich zur Berechnung gewünschter elektronischer Zustände verschiedener 1D- und 3D-Quantensysteme an. Letztendlich erweitern wir unseren Optimierungsansatz auf zeitabhängige Szenarien. Wir demonstrieren, wie diese Methode eine ausgezeichnete Übereinstimmung mit den exakten Ergebnissen in den HHG-Spektren des 1D-Wasserstoffatoms und des 1D-\ih, die intensiven Laserfeldern ausgesetzt sind, erzielt, wo die nicht optimierten s-Typ GTOs nicht übereinstimmen, selbst nach den ersten paar Harmonien im Plateaubereich

Application of Multiple Kernel Support Vector Regression for Weld Bead Geometry Prediction in Robotic GMAWProcess

Modelling and prediction of weld bead geometry is an important issue in robotic GMAW process. This process is highly non-linear and coupled multivariable system and the relationship between process parameters and weld bead geometry cannot be defined by an explicit mathematical expression. Therefore, application of supervised learning algorithms can be useful for this purpose. Support vector machine is a very successful approach to supervised learning. In this approach, a higher degree of accuracy and generalization capability can be obtained by using the multiple kernel learning framework, which is considered as a great advantage in prediction of weld bead geometry due to the high degree of prediction accuracy required. In this paper, a novel approach for modelling and prediction of the weld bead geometry, based on multiple kernel support vector regression analysis has been proposed, which benefits from a high degree of accuracy and generalization capability. This model can be used for proper selection of welding parameters in order to obtain a desired weld bead geometry in robotic GMAW process

A Comprehensive Review of General Characteristics of Peptides of Serum Immunoglobulins and Their Health Benefits

As we know Immunoglobulin or antibodies are kind of protein which is produced by the immune system and fight against microbes or germs. Immunoglobulins are: IgM, IgG and IgA which supply long-term and short-term defense against contamination or infection. Several studies had found that the milk immunoglobulins are able to improve immune defense system response against germs and make available passive immunity, specially, in infants and young animals. The existence of immunologic agents in milk, like lactoferrin and lysozyme, can assist more to its protective effects. And also by incorporation of immunoglobulins and other immune improving materials to the formula milk, we can supply or make ready for the infants the same immunologic benefits like those which got from breastfeeding. We can say that this approach is beneficial for all infants specially it is beneficial for babies that are not able to feed from breast or have compromised Immune Systems.&nbsp

Association of Serum Vitamin D Level and Serum Lipids Profile

Introduction: High level of vitamin D is associated with a better health status. The role of vitamin D deficiency in the incidence of cardiovascular events is demonstrated in previous studies. The current study aimed at evaluating the effect of vitamin D supplement therapy on serum lipids profile, as a risk factor for cardiovascular diseases.Methods: The current prospective cohort study included 221 patients admitted to a university hospital from March 2014 to March 2015. The baseline levels of the patients' serum vitamin D and lipid profile of the study subjects were recorded. After three months treatment with vitamin D, the patients' serum vitamin D level and lipid profile were re-evaluated. The results before and after the supplement therapy were compared using statistical methods.Results: The mean age of the patients was 48.2 ± 14.0 years. The mean vitamin D level was 21.0 ± 16.6 ng/mL at baseline, which increased to 35.8 ± 32.7 ng/mL (P = 0.001) after a three-month vitamin D supplement therapy. Mean low-density lipoprotein (LDL) decreased from 112.1 ± 30.0 to 98.7 ± 31.7 mg/dL (P = 0.003) after the supplement therapy. Mean high-density lipoprotein (HDL) increased from 42.8 ± 11.2 to 44.5 ± 9.0 mg/dL, but the difference was insignificant before and after the treatment (P = 0.2). Mean cholesterol reduced from 183.8 ± 42.3 to 169.5 ± 41.9 mg/dL (P = 0.02) and the mean TG dropped from 147.5 ± 98.7 to 134.7 ± 71.1 mg/dL, (P = 0.1) after vitamin D intake.Conclusions: The mean levels of LDL and cholesterol significantly decreased during the three-month intervention; in addition, although some changes were observed in the level of HDL and TG, the differences were statistically insignificant. Further studies on larger sample sizes and longer follow-ups are recommended

Prediction of Mortar Compressive Strengths for Different Cement Grades in the Vicinity of Sodium Chloride Using ANN

AbstractThe compressive strength values of cement mortar usually affect by sodium chloride quantities, chemical admixtures and cement grades so that an artificial neural network model was performed to predict the compressive strength of mortar value for different cement grades and sodium chloride (NaCl) percent. A three layer feed forward artificial neural network (ANN) model having four input neurons such as cement grades, various water to cement ratio, sodium chloride solution content, one output neuron and five hidden neurons was developed to predict of mortar each compressive strength.To this aim, twelve different mixes under three sodium chloride solution of 0%, 5% and 10% submerged after 60 days has been adopted to measure compressive strength.Artificial neural network (ANN) analysis indicated that by using ANN as non-linear statistical data modeling tool, a strong correlation between the sodium chloride percent of cement mortar and compressive strength can be established. Moreover modeling tools has great influence on the different cement grade such as 42.5 and 32.5 MPa

Involvement of the nucleus accumbensshell presynaptic NMDA receptors on anxiolytic-like behaviors induced by NMDA in adult male Wistar rat

     Glutamatergic system stimulationthe nucleus accumbens shell, may affect anxiety-related behaviors, aversive learning and memory. Glutamate receptors are differentially distributed in pre- and postsynaptic sites contributing to neuronal communications.The present study aimed to examine the possible involvement of the NAc shell presynaptic NMDA receptors on NMDA induced responses, using the elevated-plus maze (EPM) task in maleWistar rats. Bilateral guide cannulae were implanted to allow microinjection of glutamatergic agonist (NMDA) or ca+2 channel blocker (SKF96365 hydrochloride) agents. Pretest intra-NAc shell infusion of NMDA induced anxiolytic-like behaviors and impaired the EPM-associated memory upon test and retest, respectively. In addition our findings showed that, the intra-NAc shell infusion of Ca+2 channel blocker at applied doses, does not alter the anxiety-like response and aversive memory upon test and retest, respectively. Furthermore, infusing the subthreshold dose SKF prior to the injection of effective doses of NMDA, reduced the anxiolytic-like response and improved the aversive memory impairment which had already been induced by intra-NAc shell NMDA injection. Our study showed that,inhibition of the neurotransmitter exocytosis from pre-synaptic neuron via Ca+2 channel blockade bySKF96365 decreases affected induced by NMDA in the NAc shell region, indicating the involvement of the pre-synaptic NMDA receptors in NMDA induced responses.Therefore, NMDA's ability to increase anxiolytic-like behaviors and the aversive memory impairment may be the result of an action on pre-synaptic glutamatergic receptors which in turn decrease the glutamate effect at synaptic terminal level

Revolutionizing Oil Extraction: Lechinysin's Potential in Microbial Enhanced Oil Recovery as a Biosurfactant

As conventional oil recovery techniques have numerous deficiencies in oil recovery rate (up to 40% OOIP), process safety, financial aspects, sustainability and environmental impacts other efficient techniques like MEOR had been invented that utilize microbes or their metabolites like biosurfactants to enhance oil recovery process from depleted reservoirs and increase the recovery rate up to 50% of remained oil in the reservoirs. Biosurfactants are the interesting chemicals that encompass a large group of compounds with unique properties to play crucial role in improving oil recovery. Among biosurfactants, lichenysin produced by B. lichenoformis or B. mojavensis Jf-2 and it has several different variants based on the producing strains. It is an alternative candidate with amazing features like stability in extremely high temperature up to 140 °C, saving its optimal activity in a wide range of pH values from 6 up to 10 pH, high salinity up to 10% NaCl concentration, and a significant CMC from 10 to 20 mg/L that is the lowest CMC among studied biosurfactants suitable for MEOR. All these characteristics indicate its signifance as a biosurfactant that has the capability to revolutionize the MEOR technique in the future.&nbsp

The role of glutamatergic pathway between septum and hippocampus in the memory formation

The N-methyl-D-aspartate (NMDA) receptor is a subtype of glutamate receptor that is presented in highest density in the hippocampus and septum. NMDA receptors of the septum and the hippocampus are involved in cognitive performance, especially in learning and memory processes. The septum nucleus and hippocampal formation are two regions of the limbic system. The septum and the hippocampus are anatomically and functionally connected to each other. These areas made the septo-hippocampal and hippocampo-septal pathways, which are implicated in the cognitive processes. The activity of septal and hippocampal neurons is modulated by several neurotransmitters such as glutamate. Thus, changes in the glutamatergic transmission in the septum and hippocampus may influence learning and memory processes in these pathways

Low Cost Solar Power System with Open Loop Tracking for Rural and Developing Areas

Solar energy continues to enjoy interest and is becoming one of the important elements in the world's future energy consumption and economic growth. One way to increase the use of solar power systems, particularly in rural and developing areas, is through the employment of low cost, power efficient systems. This paper presents a possible low cost solution where an open loop tracking system is implemented with a small size 50 Watt (W) Monocrystalline Photovoltaic (PV) panel. The system’s performance is monitored at different tropical weather conditions. In addition, the output power is measured and compared between a static solar panel and one that includes the proposed tracking system. The measurements over the course of 6 months in Pathum Thani, north of Bangkok (Thailand), showed that the output energy with tracking system, on average, is 18 % higher than with static panel (45 Watt hour (Wh) compared to 36.5 Wh). The overall generated energy in 7 hours in a day are 315 Watt hour per day (Wh/day) and 255 Wh/day for tracking and static panel respectively. On rainy days, the average measured output power is reduced to 25% of that on the sunny days. The experimental results have been compared to those of a deduced first order simulation output and this over a period of five months. The experiment shows similarity in the trend between experimental and simulation results.  Finally, multiple sensors were added to the solar unit, and measured environmental data sent obtained by these sensors were over a low bandwidth communication link, and recorded/processed on a remote server

Effect of Low Level Laser Application at the End of Surgery to Reduce Pain after Tonsillectomy in Adults

Introduction: Tonsillectomy is among commonest otorhinolaryngologic surgeries. Many methods have been used to control post surgical pain, but despite it, pain is still one of the problems related to this operation. Recently, due to the non invasiveness of low level lasers, this modality has attracted attention. The purpose of this study is to evaluate the effects of low level laser irradiation at the end of surgery on reduction of pain after tonsillectomy in adults.Methods: In a clinical trial, 60 adult patients, candidates for tonsillectomy were randomly assigned to two groups, A and B, and both groups were anesthetized similarly by the same technique. At the end of surgery, in the case group, the tonsils’ bed were irradiated by infrared laser with 980nm wavelength, 100Hz, 4J/cm2 from the infra mandibular angle. In the controlgroup, the tonsils’ bed had laser therapy with a turned off probe.Follow ing laser treatment, the patients were reversed and extubated and consciousness achieved, pain and odynophagia were assessed at 2, 4, 6, 8, 12 and 24h post surgery based on visual analog scale for pain (VAS) and analgesic consumption.Results: In the laser group frequency of patients with pain sensation in each evaluated hour was lower than in the control group. The amount of pain decrease and analgesic consumption reduction was significantly higher in patients who received laser (P=0.01).Conclusion: Based on the results of this study, use of low level lasers is effective in reducing tonsillectomy post surgical pain in adults