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Shahkar Falak,신보경,허도성 한국고분자학회 2021 Macromolecular Research Vol.29 No.8
A fabrication strategy for the pore-selective functionalization of silver (Ag) in the honeycomb-patterned (HCP) porous polystyrene (PS) film was demonstrated by a modified breath figure method accompanying an interfacial chemical reaction. It was performed by casting the polymer solution including ferrocene under humid conditions containing AgNO3. The film showed HCP porous morphology with poreselective Ag coating. The coating of Ag was identified by scanning electron microscopy with energy-dispersive X-ray spectroscopy and elemental mapping analysis. The conductivity of the film was obtained by a four-point probe conductivity measuring method, and it was observed that the conductivity increased by increasing the ferrocene, concentration.
Study on Development of Portable Incubator
Amre Eizad(에이자드 아믈),Falak Zahra(파락 자흐라),Hamza Alam(함자 알람),Hassan Tahir(하산 따히르),Afrasiab Khan Bangash(아프라시압 칸 반가시),Sung-Ki Lyu(류성기) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.9
Preterm children require a controlled environment that is as close as possible to that inside the womb. Incubators are well equipped to fulfill this requirement; however, they are cumbersome and expensive, thereby restricting their portability and availability in less developed and rural areas. This research comprises the development and system validation of a portable incubator. The system consists of a collapsible baby enclosure that can be stowed inside the system base when not in use. The enclosure is made from acrylic such that it is easy to clean and allows unhindered visual observation of the occupant while being robust enough to withstand transit conditions. The system can be powered either by a mains supply or a 12-VDC automobile power supply. Additionally, it has an onboard battery to ensure a continuous supply during transit. A Peltier plate controlled using a microcontroller ensures the desired enclosure temperature irrespective of the ambient temperature. Built-in sensor probes can measure the skin temperature, pulse rate, blood oxygenation level, and ECG of the infant and display them on the system screen. The system function is validated by testing its peak power consumption and the heating and cooling performances of the environment control system.
Optimization of cost and mechanical properties of concrete with admixtures using MARS and PSO
Reza Sarkhani Benemaran,Mahzad Esmaeili-Falak 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.26 No.4
The application of multi-variable adaptive regression spline (MARS) in predicting he long-term compressive strength of a concrete with various admixtures has been investigated in this study. The compressive strength of concrete specimens, which were made based on 24 different mix designs using various mineral and chemical admixtures in different curing ages have been obtained. First, The values of fly ash (FA), micro-silica (MS), water-reducing admixture (WRA), coarse and fine aggregates, cement, water, age of samples and compressive strength were defined as inputs to the model, and MARS analysis was used to model the compressive strength of concrete and to evaluate the most important parameters affecting the estimation of compressive strength of the concrete. Next, the proposed equation by the MARS method using particle swarm optimization (PSO) algorithm has been optimized to have more efficient equation from the economical point of view. The proposed model in this study predicted the compressive strength of the concrete with various admixtures with a correlation coefficient of R=0.958 rather than the measured compressive strengths within the laboratory. The final model reduced the production cost and provided compressive strength by reducing the WRA and increasing the FA and curing days, simultaneously. It was also found that due to the use of the liquid membrane-forming compounds (LMFC) for its lower cost than water spraying method (SWM) and also for the longer operating time of the LMFC having positive mechanical effects on the final concrete, the final product had lower cost and better mechanical properties.
Permanand, Soothar,Hao, Wang,Zaheer Ahmed, Dayo,Falak, Naz,Badar, Muneer,Muhammad, Aamir International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.12
In this paper, a high gain, broadband planar vivaldi antenna (PVA) by utilizing a broadband stripline feed is developed for wireless communication for IoT systems. The suggested antenna is designed by attaching a tapered-slot construction to a typical vivaldi antenna, which improves the antenna's radiation properties. The PVA is constructed on a low-cost FR4 substrate. The dimensions of the patch are 1.886λ<sub>0</sub>×1.42λ<sub>0</sub>×0.026λ<sub>0</sub>, dielectric constant Ɛ<sub>r</sub>=4.4, and loss tangent δ=0.02. The width of the feed line is reduced to improve the impedance bandwidth of the antenna. The computed reflection coefficient findings show that the suggested antenna has a 46.2% wider relative bandwidth calculated at a 10 dB return loss. At the resonance frequencies of 6.5 GHz, the studied results show an optimal gain of 5.82 dBi and 85% optimal radiation efficiency at the operable band. The optometric analysis of the proposed structure shows that the proposed antenna can achieve wide enough bandwidth at the desired frequency and hence make the designed antenna appropriate to work in satellite communication and medical internet of things (M-IoT) healthcare applications.
Hayat Alvina,Anas Muhammad,Shaheen Zeenat,Falak Aliza,Quraishi Umar Masood 한국작물학회 2024 Journal of crop science and biotechnology Vol.27 No.2
Cadmium (Cd) is a water-soluble heavy metal. It has adverse effects on rivers and underground water in developing countries. Rice is a hydrophilic crop grown by extensive utilization of water. Presence of Cd in paddy water can lead to destruction of both quality and quantity of rice. To access the variation in impact of Cd on two elite rice cultivars of Pakistan i.e., indica (Super Basmati) and japonica (JP-5), a pot experiment with three replicates was carried out in completely randomized design. To induce stress conditions, both cultivars were subjected to elevated levels of Cd (50 mg/kg) as cadmium chloride. The results indicated that Cd stress had a high impact on morpho-physiological traits such as grain yield, thousand grain weight and tiller number in Supper Basmati compared to JP-5. This was due to high accumulation of the reactive oxygen species and lower levels of enzymatic antioxidants including peroxidase, catalase, carotenoids, glutathione, ascorbate peroxidase, glutathione peroxidase, and phenols in Super basmati. The Cd translocation from roots to leaf and subsequently grains was higher in Super Basmati compared to JP-5. Nutritional profiling of grains showed low level of carbohydrates and proteins in Super Basmati compared to JP-5 which shows that JP-5 is more tolerant, nutritious, and high-yielding under Cd-stress conditions. JP-5 is thus recommended to be cultivated in Cd-stressed areas in future and breeders can further use it to improve crop performance in Cd-stress soil and ensure sustainable food production around the world
Comprehensive analysis of plant rapid alkalization factor (RALF) genes
Sharma, A.,Hussain, A.,Mun, B.G.,Imran, Q.M.,Falak, N.,Lee, S.U.,Kim, J.Y.,Hong, J.K.,Loake, G.J.,Ali, A.,Yun, B.W. Elsevier Science B.V., Amsterdam. 2016 Plant Physiology and Biochemistry Vol. No.
<P>Receptor mediated signal carriers play a critical role in the regulation of plant defense and development. Rapid alkalization factor (RALF) proteins potentially comprise important signaling components which may have a key role in plant biology. The RALF gene family contains large number of genes in several plant species, however, only a few RALF genes have been characterized to date. In this study, an extensive database search identified 39, 43, 34 and 18 RALF genes in Arabidopsis, rice, maize and soybean, respectively. These RALF genes were found to be highly conserved across the 4 plant species. A comprehensive analysis including the chromosomal location, gene structure, subcellular location, conserved motifs, protein structure, protein-ligand interaction and promoter analysis was performed. RALF genes from four plant species were divided into 7 groups based on phylogenetic analysis. In silico expression analysis of these genes, using microarray and EST data, revealed that these genes exhibit a variety of expression patterns. Furthermore, RALF genes showed distinct expression patterns of transcript accumulation in vivo following nitrosative and oxidative stresses in Arabidopsis. Predicted interaction between RALF and heme ligand also showed that RALF proteins may contribute towards transporting or scavenging oxygen moieties. This suggests a possible role for RALF genes during changes in cellular redox status. Collectively, our data provides a valuable resource to prime future research in the role of RALF genes in plant growth and development. (C) 2016 Elsevier Masson SAS. All rights reserved.</P>
Association of a VDR Gene Polymorphism with Risk of Colorectal Cancer in Kashmir
Rasool, Sabha,Kadla, Showkat Ahmad,Khan, Tanzeela,Qazi, Falak,Shah, Nisar Ahmad,Basu, Javed,Khan, Bilal Ahmad,Ahktar, Qulsum,Sameer, Aga Syed,Ganai, Bashir Ahmad Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.10
Roles of the vitamin D receptor in etiology of cancers, including colorectal cancer, have been repeatedly stressed in different parts of the world. A case control study aimed to evaluate the relationship between the two was therefore initiated in Kashmir, known both for its increasing incidence of gastrointestinal cancers and deficiency of micro-nutrients especially vitamin D. The study included a total of 617 subjects (312 colorectal cancer cases and 305 controls), with sampling carried out over a period of 5 years. DNA samples from the blood of the subjects were analyzed for start codon Fok I VDR polymorphism. We obtained a 1.3 fold increased risk among individuals homozygous for f variants as compared to subjects homozygous for F allele (odds ratio OR 1.3, 95%CI, 0.861-1.65). Our study also showed statistically significant results when dwelling and tumor location characteristics were stratified with Fok I polymorphism, all of which suggests a possible role of Fok I polymorphism in the etiology of CRC in Kashmir.