There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

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Electronic Transport In Mesoscopic Systems

Time-Frequency Analysis.

Antenna Theory And Design

The nephrotic syndrome

Structural health monitoring (SHM) is a method of localizing damage in infrastructures regarding structural strain, vibration or movements due to external contributing factors which mainly occur as a result of natural disasters. The need to analyze such occurrences can prevent potential damage of massive scale. A sensing system with high sensitivity is needed for reliable structural health monitoring. A capacitive sensing circuit is designed using off-the-self-components and transmit data wirelessly using XBee. The circuit can detect small changes of capacitance variation due to structure vibration.

Wireless structural health monitoring system by capacitor sensing technique

The effects of both the high-k and low-k sidewall spacers on the performance of a GaAs based Double Gate Junctionless Metal Oxide Semiconductor Field Effect Transistor (DG-JLMOSFET) have been investigated. Here, the results have been obtained from SILVACO ATLAS TCAD simulation tool. The proposed DG-JLMOSFET structure shows superior performance when TiO2 is used as the sidewall spacer. Additionally, we observed the improvements in the short channel effects (SCEs), subthreshold swing (SS) and drain induced barrier lowering (DIBL) of 79 mV/decade and 108 mV/decade, respectively. The GaAs based DG-JLMOSFET with sidewall spacer gives high ON current (ION) and low OFF current (IOFF) with high ON-state to OFF -state current ((ION/IOFF) ratio of 9.381×107 compared to the device structure without sidewall spacers. The results have been finally compared with the Si counterpart. The outcomes could be a good insight for fabricating the GaAs based future practical DG-JLMOSFETs for nano-devices.

Effect of Sidewall Spacers on the Performance of GaAs Based DG-JLMOSFET

Patients with HIV or AIDS suffer from wide varieties of complications that are related to infection. The eye as an organ is not spared from HIV-related manifestations. The ocular manifestations can be the presenting sign of a systemic infection in an otherwise asymptomatic HIV-positive person. The disease can have adnexal, anterior segment, posterior segment, orbital and neuro-ophthalmic manifestations. The objective of the study was to evaluate the ophthalmological manifestations among adult HIV infected patients of Bangladesh and co-relate the findings with CD-4+ T cell count. This cross sectional study was conducted in the department of Community Ophthalmology, Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh from January 2013 to September 2015. Purposive sampling technique was applied to enroll the patients. Total 110 patients were enrolled regardless of their immunological status by inclusion and exclusion criteria. Relevant clinical evaluation including history & physical examinations, laboratory investigations and some ocular examinations like- visual acuity, slit lamp biomicroscopy, IOP, indirect ophthalmoscopy with +90D (diopter) and +20D were done. The age of the study population ranged from 20-58 years with mean±SD 37.63±8.16 years. Among the study population 67(60.9%) were male and 43(39.1%) were female. According to ART status, 58(52.7%) were on ART and 52(47.3%) were ART naive. The mean CD4+ T- cells count was 410±281.65 with minimum to maximum was 6-1266 cells/μl. Among them 53(48.2%) had HIV related ocular findings and 57(51.8%) had no HIV related ocular manifestation. In relation with CD+ T- cells count, highly significant relation was found with lower CD4+ T- cells count and ocular manifestation (p=0.001).

Ocular Manifestation and Correlation with CD4+ T Cell Count among Adult HIV/AIDS Patients in Bangladesh.

Rain fade slope is very useful knowledge used to design of the fade countermeasures in satellite communication link. Recently, ITU-R has proposed fade slope model by limiting elevation angle up to 500. Rain fade slope was measured from downlink of space-earth path of MEASAT3 in Kuala Lumpur (3.30 N, 101.70 E), Malaysia for one year period during 1st July 2010 – 30th June 2011. The elevation angle is about 770. This paper has investigated ITU-R model using measured data. A modified ITU-R model has been proposed for higher elevation angle based on measured data.

Fade slope modeling at high elevation angle on space-earth path link

Organic solar cell draws attention because of its low cost and constantly increasing efficiency. Though having many advantages, low power conversion efficiency hinders organic photovoltaic cells from their commercialization. Tandem solar cells combine two or more single junction cells of complementary absorption band undoubtedly provide an effective means to uplift the efficiency organic solar cells. In this paper, we analyze the performance of three individual single junction organic solar cells. Single junction PCDTBT:PCBM cell shows an efficiency of 6.02% whereas PMDPP3T:PCBM and pBBTDPP2:PCBM shows efficiency of 5.99% and 3.15% respectively. Tandem cell consists of PMDPP3T:PCBM and PCDTBT:PCBM shows 10% efficiency with open-circuit voltage 1.48V and short circuit current density of 10.38 mA/cm2, Using pBBTDPP2:PCBM as a middle layer between them form a triple junction structure that offers an open-circuit voltage of 2.1 V, short circuit current density of 9.4 mA/cm2and power conversion efficiency of 12.25%, which means improved performance over the double junction structure.

Md. Rafiqul Islam

Papers

Wireless structural health monitoring system by capacitor sensing technique

Effect of Sidewall Spacers on the Performance of GaAs Based DG-JLMOSFET

Ocular Manifestation and Correlation with CD4+ T Cell Count among Adult HIV/AIDS Patients in Bangladesh.

Fade slope modeling at high elevation angle on space-earth path link

Efficient Triple Junction Organic Solar Cell