The effect of RGO on dielectric and energy harvesting properties of P(VDF-TrFE) matrix by optimizing electroactive β phase without traditional polling process

Habibur, Rahaman Md,Yaqoob, Usman,Muhammad, Sheeraz,Uddin, A.S.M.Iftekhar,Kim, Hyeon Cheol Elsevier 2018 Materials chemistry and physics Vol.215 No.-

<P><B>Abstract</B></P> <P>This study explores the role of RGO in improving the energy harvesting potentiality of P(VDF-TrFE) matrix without applying the conventional polling process. Five different piezoelectric sheets were prepared by varying the RGO contents in P(VDF-TrFE) matrix to realize its optimum concentration in the matrix. The effect of RGO on the electroactive polar beta (<I>β</I>) phase of P(VDF-TrFE) was investigated through the X-ray diffraction (XRD) pattern and the Fourier transform infrared spectroscopy (FT-IR). To elaborate the RGO role, dielectric properties of the as-prepared piezoelectric sheets were also checked over the frequency range of 1 kHz–100 kHz at room temperature. Finally, these piezoelectric sheets were used to fabricate the piezoelectric nanogenerators (PENGs) devices. Among the fabricated PENGs, the PENG with 0.1% RGO contents reveals the maximum open circuit voltage of 2.4 V and highest peak of short-circuit current around 0.8 μA at an applied force of 2 N. Moreover, it exhibits the highest output power of 3.2 μW at 1.8 MΩ load resistance, all the outputs were recorded without applying polling process. It was estimated that our fabricated self-poled, flexible piezoelectric nano-generator can be a useful candidate to powering futuristic nano-devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The effect of RGO nanosheets on the electroactive polar <I>β</I> phase of P(VDF-TrFE) was explored. </LI> <LI> RGO nanofillers act as a polling medium in the P(VDF-TrFE) matrix. </LI> <LI> Enhancement in energy harvesting was observed with increasing of RGO concentration. </LI> </UL> </P>

Evolving Insights into the Pathophysiology of Diabetic Neuropathy: Implications of Malfunctioning Glia and Discovery of Novel Therapeutic Targets

Habibur Rahman, Md,Kumar Jha, Mithilesh,Suk, Kyoungho Bentham Science 2016 CURRENT PHARMACEUTICAL DESIGN Vol.22 No.6

Status, Distribution and Diversity of Invasive Forest Undergrowth Species in the Tropics: a Study from Northeastern Bangladesh

Md. Habibur Rahman,Mohammed Abu Sayed Arfin Khan,Most. Jannatul Fardusi,Bishwajit Roy 강원대학교 산림과학연구소 2010 Journal of Forest Science Vol.26 No.3

This paper analyzes data on the composition, status, diversity, and distribution pattern of invasive forest undergrowth species in a protected area (Khadimnagar National Park) of Northeastern Bangladesh. Assessment was done by means of stratified random sampling to diversify the invasive forest undergrowth species. For vegetation survey, 45 plots were taken randomly in (2 m × 2 m) circular plot from three topographical regions namely top of the hill, middle slope and plain land (15 plots from each region) and a total of 715 individuals, 22 invasive species belonging to 17 families were recorded from the study site. Among invasive species, shrubs constitute 10 species, herbs 9 species, and vines 3 species respectively. Mass number of invasive undergrowth species was grows in plain land (45.45%) followed by middle slope (31.82%). Based on the survey, invasive undergrowth plants of study areas were also categorized into three degrees of invasiveness e.g., highly invasive, moderately invasive and potentially invasive. Herbs, shrubs, and vines constitute the highest density at Chromolaema odorata (Linn.) King. (1.09), relative density at Chromolaema odorata (Linn.) King. 6.85%; highest and lowest frequency was calculated at Cassia alata L. (64.44%) and Diplazium esculentum (24.44%); for relative frequency the highest was Cassia alata L., which occupies 6.64%. Determination of the abundance of the different species revealed that Cassia alata L., constitutes (3.36) followed by Pteris cretica Wilsonii (3.14) of the area. The presence of invasive undergrowth species always reduced the number of associated species. Therefore, an extensive in-depth long-term investigation, proper policy formulation and management interventions and further study and continuous monitoring on their impacts need to be triggered targeting the control of the invasive undergrowth species of this protected area. In this aspect, national and international organization could help to conserve its biodiversity.

Detection of OCT image Parameters Based on Deep Learning algorithm

Md Habibur Rahman(하비부르 라만),Hang Chan Jo(조항찬),Dong Jin Lee(이동진),Dae Yu Kim(김대유) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6

In this article, we present a computerized detection of optical coherence tomography (OCT) image parameters using a deep learning method. To detect the parameters, Bruch’s membrane opening (BMO) and laminar cribrosa (LC) in OCT image, proposed system work with a convolutional neural network (CNN) algorithm. Herein, we designed detection method using YOLOv3 algorithm where darknet53 CNN used as a backbone network. We used OCT medical images for testing the detection performance. The excremental result for detection performance show that, 99.92% and 99.18% average detection precision of parameters BMO and LC, respectively on the testing image.

Present Status of Rooftop Gardening in Sylhet City Corporation of Bangladesh: an Assessment Based on Ecological and Economic Perspectives

Md. Habibur Rahman,Most. Jannatul Fardusi,Mizanur Rahman,Md. Mostafa Kamal,Md. Jasim Uddin,Bishwajit Roy 강원대학교 산림과학연구소 2013 Journal of Forest Science Vol.29 No.1

Present study analyzes the rooftop gardening status, floristic composition and cost and return of the rooftop garden in Sylhet City Corporation of northeastern Bangladesh. Data was collected from 450 rooftop gardeners randomly during July-September 2010. Study reveal that rooftop gardening is generally for mental satisfaction (95.3%) followed by leisure time activity (87.8%) in the study area and almost all the family members of gardeners’ were involved; while collection of planting materials, sites preparation and marketing of products were reported to be carried out by males only (male 71.33%). Middle income classes were most interested in rooftop gardening (43.78%). The survey recorded 53 plant species (35 families) of which Cucurbitaceae family represented highest eight species. Shrubs (28%) were highest followed by herbs (26%) among agri-crops (36%) and flower species (30%). About 89% of the rooftop gardeners procured planting materials from nursery, market, fair, neighbor, relative and friends and they mostly prefer to use seedlings (48%) for roof gardening followed by direct seed sowing (21%). Gardeners sell products sporadically in different local markets, directly or through intermediaries, with no uniform pricing for system. Rooftop gardening improves the food security and meet nutritional deficiency to the gardeners. Survey revealed that generally very few people consider rooftop gardening commercially to get profit and from the cost-return analysis this gardening system can be economically viable if proper and scientifically managed. The study conclude that active government and NGOs could play vital role to increasing this activities by providing training and motivate people with technical aspects of rooftop gardening.

Hash indexing on Rete nodes for efficient spatiotemporal continuous query rule processing

Muhammad Habibur Rahman,Bonghee Hong,Dongjun Lim,Sanghyun Lee,Woochan Kim,Hari Setiawan 한국차세대컴퓨팅학회 2021 한국차세대컴퓨팅학회 학술대회 Vol.2021 No.11

This paper proposes a hash index for spatiotemporal continuous query processing rules for filtering, classifying, analyzing, and responding to consecutively collected target objects. The Rete technique for improving the performance of rule-based complex event processing shows better performance than the rule interpretation method as it creates a compiled data structure for the rule. This paper proposes a performance improvement method that eliminates the rule search overhead by creating a spatiotemporal index for the Rete nodes expressing spatiotemporal continuity query rules and stabbing the Rete node of the rule by employing hash indexing on the stream data.

Skin Safety Evaluation of Long-Term treatment of an Electrolyzed Neutral Oxidizing Water on C57BL/6 mice

Md. Habibur Rahman,Ailyn Fadriquela,Johny Bajgai,Seong-Hoon Goh,Cheol-Su Kim,Kyu-Jae Lee 한국물학회 2020 한국물학회지 Vol.8 No.1

Skin is a complex barrier organ that can fight against various endogenous and exogenous factors. The damaged skin barrier can lead to different skin problems that can exhibit the skin condition such as a decrease of elasticity and sebum level, an increase of water loss, strengthening of keratinocyte cohesion and wrinkle formation, which will eventually lead to different skin diseases. With the current use of chlorine-rich water as disinfectant and its potential in medical field, it is important to check its safety use. The objective of the study was to evaluate skin safety of electrolyzed neutral oxidizing water (ENOW) (pH: 7.11, oxidation reduction potential: 450 mV, available chlorine concentration: 5.0 ppm) after the long-term use (90-day skin application) on the skin of C57BL/6 mice compared to normal control group (NC) treated with tap water (TW) (pH: 7.8, oxidation reduction potential: 500mV, available chlorine concentration: 0.7 ppm). We were measured skin state such as the moisture, elasticity, sebum, pore size, and wrinkle. Oxidative stress markers such as reactive oxygen species (ROS), nitric oxide (NO), glutathione peroxides (GPx) and catalase (CAT) were measuredin using serum and skin lysate samples. Inflammation cytokines such as IL-1α, IL-1β, IL-13, GM-CSF and TNF-α, and the Th1/Th2 cytokines such as IL-2, IL-4, IL-5, IL-6, IL-10 and IL-12 were also analyzed. In consequently, The skin state of ENOW group showed higher level of elasticity and moisture compared to NC group. ROS and NO levels in skin did not show adverse effect in ENOW group. GPx were also controlled in all groups, however, a significant decrease in CAT level was observed in both NC and ENOW groups. Moreover, serum inflammatory cytokine of ENOW group did not show significant difference as compared to NC and TW groups, however, GM-CSF showed a significantly lower level in the ENOW group than NC group. Cytokines related to allergic response showed no difference in the skin. Taken together, long term treatment of ENOW might be safe on skin in vivo . However, more clinical studies are needed to verify the skin safety of ENOW.

IoE Based Factory Energy Management System

Md. Habibur Rahman,Md Morshed Alam,Yeong Min Jang 한국통신학회 2020 한국통신학회 학술대회논문집 Vol.2020 No.8

Safety Evaluation of Drinking Mineral Supplement Hypochlorous Acid Water on Helicobacter pylori-Infected C57BL/6 Mouse Model

Md. Habibur Rahman,Johny Bajgai,Ailyn Fadriquela,Subham Sharma,Trinh Thi Thuy,Seong-Hoon Goh,Cheol-Su Kim,Kyu-Jae Lee 한국물학회 2020 한국물학회지 Vol.8 No.1

Hypochlorous acid water can promote pruritus as an adverse effect under certain conditions, which should be taken into account to ensure safety. In recent days, Mineral Supplement Hypochlorous Acid Water (MS-HOCl) has received massive attention in research as a new-concept cleansing agent due to its high sterilizing properties, easy accessibility, and safety aspects. This present study was conducted to evaluate the drinking effects of MS-HOCl treatment of the Helicobacter pylori (H. pylori )-infected C57BL/6 mouse model to verify the safety effects. The experimental mice were divided into 3 groups: NC (Purified water + no infection), PW (Purified water + H. pylori infection), and MS-HOCL (MS-HOCl + H. pylori infection). Water was supplied through water bottle for mouse for 4 weeks, and changed once a day. We measured the bodyweight, and total WBC and its differential counts such as lymphocytes, monocytes, neutrophil, eosinophil and basophil. Besides that, we also tested biochemical markers such as reactive oxygen species (ROS), nitric oxide (NO), glutathione peroxides (GPx), and calcium activity in both serum and stomach lysate samples. Our results showed that daily oral administration of MS-HOCl water for 4 wk did not show any abnormal findings about hematological and biochemical parameters such as ROS, NO, GPx, and calcium activity in both serum and stomach lysate. There were no significant differences in bodyweight between the three groups. Overall, our results showed no negative effects of drinking MS-HOCl in the H. pylori -infected C57BL/6 mice model. However, more controlled studies are needed to determine the safety of drinking MS-HOCl.

차아염소산수 공중 분무를 통한 인체 병원성 황색포도상구균 살균효과 평가

Md. Habibur Rahman,Johny Bajgai,Ailyn Fadriquela,Subham Sharma,Trinh Thi Thuy,Goh Seong Hoon,Cheol-Su Kim,Kyu-Jae Lee 한국물학회 2020 한국물학회지 Vol.8 No.1

Hypochlorous acid has very ideal condition such as powerful and broad sterilizing effect, easy accessibility, low price and high safety as a disinfectant. It can be applied by various ways, but the effect may vary depending on the method, so it is necessary to establish use standard for the maximized effect. In this study, we investigated the sterilizing effect of hypochlorous acid indoor environments contaminated with Staphylococcus aureus using fogging method. Hypochlorous acid water was classified two: Huureka-E generated by electrolysis [pH 5.4, oxidation-reduction potential (ORP) 530, active chlorine concentration (ACC) 51], and Huureka-M produced by a mixing and dilution method (pH 5.5, ORP 913, ACC 53). Blood agar plate were put on the table 1 m high in an enclosed room, then hypochlorous acid was fogged up to 80% humidity, and S. aureus-diluted solution was sprayed three times on the air. The plate was moved for bacterial culture 0 min 30 min, 60 min, and 90 min after spraying bacteria. As a result of the bacterial culture, the growth inhibitory rate of Huureka-M was 92.2 ± 0.8%, 96.0 ± 0.6% and 97.4 ± 0.1% time-dependently (p < 0.001 vs. 0 minm, respectively), and that of Huureka-E was 66.1 ± 1.3%, 76.4 ± 2.4% and 98.2 ± 0.6% (p < 0.001 vs. 0 min, respectively). In confluence, the fogging of both electrolysis-type and mixing-type hypochlorous acid water showed highly satisfactory sterilizing power as a disinfectant. Since spraying or fogging is a highly effective application method for a large space, hypochlorous acid can be recommended to be utilized in the hospital, agriculture sector, livestock industry, public facilities, etc. Further study will be necessary to be standardized the sterilizing protocol according to the application method and ACC.