Frequency-Doubling of Femtosecond Pulses in “Thick” Nonlinear Crystals With Different Temporal and Spatial Walk-Off Parameters

We present a comparative study on frequency-doubling characteristics of femtosecond laser pulses in thick nonlinear crystals with different temporal and spatial walk-off parameters. Using single-pass second harmonic generation (SHG) of 260 fs pulses at 1064 nm from a high-average-power femtosecond Yb-fiber laser in 5-mm-long crystals of β-BaB2O4 (BBO) and BiB3O6 (BIBO), we find that for comparable values of temporal and spatial walk-off parameters in each crystal, the optimum focusing condition for SHG is more strongly influenced by spatial walk-off than temporal walk-off. It is also observed that under such conditions, the Boyd and Kleinman theory commonly used to define the optimum focusing condition for frequency-doubling of cw and long-pulse lasers is also valid for SHG of ultrafast lasers. We also investigate the effect of focusing on the spectral, temporal, and spatial characteristics of the second harmonic (SH) radiation, as well as angular acceptance bandwidth for the SHG process, under different temporal and spatial walk-off conditions in the two crystalsPeer ReviewedPostprint (author's final draft

Critically phase-matched Ti:sapphire-laserpumped deep-infrared femtosecond optical parametric oscillator based on CdSiP2

We report a high-repetition-rate femtosecond optical parametric oscillator (OPO) for the deep-infrared (deep-IR) based on type-I critical phase-matching in CdSiP2 (CSP), pumped directly by a Ti:sapphire laser. Using angle-tuning in the CSP crystal, the OPO can be continuously tuned across 7306–8329 nm (1201–1369  cm−1) in the deep-IR. It delivers up to 18 mW of idler average power at 7306 nm and >7  mW beyond 8000 nm at 80.5 MHz repetition rate, with the spectra exhibiting bandwidths of >150  nm across the tuning range. Moreover, the signal is tunable across 1128–1150 nm in the near-infrared, providing up to 35 mW of average power in ∼266  fs pulses at 1150 nm. Both beams exhibit single-peak Gaussian distribution in TEM00 spatial profile. With an equivalent spectral brightness of ∼5.6×1020photons s−1 mm−2 sr−10.1% BW−1, this OPO represents a viable alternative to synchrotron and supercontinuum sources for deep-IR applications in spectroscopy, metrology, and medical diagnostics.Peer ReviewedPostprint (author's final draft

Wireless Multichannel Multipoint Broadcast Service for Mobile Stations

In wireless Multicast Broadcast Service (MBS), the common channel is used to multicast the MBS content to the Mobile Stations (MSs) on the MBS calls within the coverage area of a Base Station (BS), which causes interference to the dedicated channels serving the traditional calls, and degrades the system capacity. The MBS zone technology is proposed in Mobile Communications Network (MCN) standards to improve system capacity and reduce the handoff delay for the wireless MBS calls. In the MBS zone technology, a group of BSs form an MBS zone, where the macro diversity is applied in the MS, the BSs synchronize to transmit the MBS content on the same common channel, interference caused by the common channel is reduced, and the MBS MSs need not perform handoff while moving between the BSs in the same MBS zone. However, when there is no MBS MS in a BS with the MBS zone technology, the transmission on the common channel wastes the bandwidth of the BS. It is an important issue to determine the condition for the MBS Controller (MBSC) to enable the MBS zone technology by considering the Quality of Services (QoS) for traditional calls and MBS calls are used to reduce the dependency over the common channel and also it is going to reduce the delay over the network. By enabling Dynamic Channel Allocation (DCA) and Enhance Dynamic Channel Allocation (EDCA) we are going to overcome these problems

Preemptive Routing & Intrusion Detection for MANETs

An ad-hoc network will often change rapidly in topology, this courses for routes in the network to often disappear and new to arise. The Ad-hoc On-Demand Distance Vector Routing Protocol(AODV), is based on the principle of discover routes as needed. In this paper we will extend the definition of AODV with the ability to discover multiple routes to a host and switch between them, if an active route is becoming weak and there is a risk that it will disappear. We will refer to it as pre-emptive AOMDV . We will show that the performance of pre-emptive AOMDV do handle changes in topology better than AODV it self. To show the effect of extending AODV, the suggested protocol is implemented in a simulator. Performance enhancements will be presented from different scenarios, to compare pre-emptive AOMDV with the ordinary AODV. In this paper we also focus on intrusion detection based on Finite State Machine and cache memory in ad hoc networks. Security is one of the most important issues in current networks. The most common cases of attacks in mobile Ad hoc networks can be drop of routing packets and changes in the incoming packets which aims at disrupting the network routing and overall network reduce performance. The presented approach based on FSM focuses at recognizing the malicious nodes within the network in a fast and accurate way, then it deals with rapid introduction of the malicious nodes to other nodes in the network to prevent sending multiple packets and drop and packet change. Finally, we will show the significant improvement in comparison with others, we simulated our methods by NS2 software

New frontiers and conceptual frameworks for energy justice

This article explores how concepts from justice and ethics can inform energy decision-making and highlight the moral and equity dimensions of energy production and use. It defines “energy justice” as a global energy system that fairly distributes both the benefits and burdens of energy services, and one that contributes to more representative and inclusive energy decision-making. The primary contribution of the article is its focus on six new frontiers of future energy justice research. First is making the case for the involvement of non-Western justice theorists. Second is expanding beyond humans to look at the Rights of Nature or non-anthropocentric notions of justice. Third is focusing on cross-scalar issues of justice such as embodied emissions. Fourth is identifying business models and the co-benefits of justice. Fifth is better understanding the tradeoffs within energy justice principles. Sixth is exposing unjust discourses. In doing so, the article presents an agenda constituted by 30 research questions as well as an amended conceptual framework consisting of ten principles. The article argues in favor of “justice-aware” energy planning and policymaking, and it hopes that its (reconsidered) energy justice conceptual framework offers a critical tool to inform decision-making

IMPLEMENTATION AND EVALUATION OF HEALTH SCREENING SERVICES TO DIABETIC AND HYPERTENSIVE PATIENTS IN A SELECTED COMMUNITY PHARMACY AT BELGAUM CITY

OBJECTIVE: To select, set up and initiate the health screening services in the community pharmacy, to design and develop patient data collection form and patient identity card, to implement health screening services in a selected community pharmacy & to evaluate the health screening services data.METHOD: The study was a prospective, investigational and community interventional study, conducted for a period of ten months from May 2008 to February 2009.RESULT: 98 patients and 24 customers under risk factors were screened during the study. Out of which 58 (59.18%) patients were diabetic with hypertensive, 26 (26.53%) were hypertensive and 14 (14.28%) were diabetic. The systolic and diastolic blood pressure, random blood sugar and body mass index values of the screened patients reveals the need for the provision of health screening services in the community pharmacy by a pharmacist. Various demographic factors like age, gender, occupation, economic status, educational background, periodic check-up showed equal impact of pharmacist involvement and need to provide these services in the community pharmacy.CONCLUSION: This study suggest that there is ample scientific evidence showing that certain risk factors pre-dispose individuals to development of diabetes and hypertension, there is sufficient evidence to conclude that community screening is a cost effective approach to reduce the morbidity and mortality associated with these diseases in healthy individuals. Community screening programs may provide a means to enhance public awareness regarding seriousness of diabetes and hypertension and its complications. KEYWORDS: Health Screening Services, Community Pharmacy, Diabetes, Hypertension

A Comparative Study of Clonidine and Dexmedetomidine with 0.5% Levobupivacaine in ultrasound-guided Axillary Brachial Plexus Block for Upper Limb Surgeries

Background: Clonidine and Dexmedetomidine as an additive to Levobupivacaine in ultrasound-guided axillary brachial plexus block are not studied well. Hence, this study was designed to compare the efficacy of the Clonidine and Dexmedetomidine, used as an adjunct to Levobupivacaine in ultrasound-guided axillary brachial plexus block in upper limb elective surgery.Materials and Methods: Eighty patients of the American Society of Anesthesiologists Grade I/II undergoing upper limb elective surgery were divided into two equal age/gender-matched groups. Group-LD received ultrasound-guided axillary brachial plexus block using injection 0.5% Levobupivacaine 20 ml+dexmedetomidine (1 μg/Kg), and group LC received ultrasound-guided axillary brachial plexus block using injection 0.5% Levobupivacaine 20 ml + Clonidine (1.5 μg/Kg). The onset and duration of sensory and motor block, hemodynamics, and side effects were recorded. Results: The time for onset of sensory block and motor block in group LD was significantly faster than group LC (4.53±1.07 and 7.88±1.29 min vs. 5.90±0.81 and 8.85±1.81min, p<0.0001). The duration of motor block in group LD was significantly longer than group LC (Sensory and motor block: 662.50 ± 50.95 and 625.50 ± 51.95min, vs 567.75 ± 62.33 and 560.62 ± 67.19 min. p< 0.0001). The sedation score was highly significant at 30 min (p<0.0001) and was significant at 60 min (p<0.05), postoperatively. Conclusion: The addition of Dexmedetomidine (1μg/Kg) as an adjuvant to Levobupivacaine (0.5%) for upper limb surgeries by axillary brachial plexus block had provided the rapid onset of sensory block and motor block and enhanced duration of sensory and motor block with arousable sedation without any adverse effects compared to clonidine (1.5μg/Kg)