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Singh, Swati,Hong, Seunghyun,Jeon, Wonjae,Lee, Dongmok,Hwang, Jae-Yeol,Lim, Seulky,Kwon, Gi Duk,Pribat, Didier,Shin, Hyunjung,Kim, Sung Wng,Baik, Seunghyun American Chemical Society 2015 Chemistry of materials Vol.27 No.7
<P>The successful mechanical exfoliation and chemical synthesis of graphene has attracted considerable attention for the synthesis of other two-dimensional materials on graphene template. Chalcogenide materials such as Sb2Te3 are of interest due to the rhombohedral lattice structure with two-dimensional hexagonally closed-packed atomic layers along the c-axis. Here we synthesized c-axis-oriented Sb2Te3 nanoplates (NPs) on graphene substrates by the microwave-assisted solvothermal method. The microwave irradiation resulted in a higher temperature of graphene, compared with the synthesis solution, which was revealed by the single-mode microwave experiments and an analytical model based on energy balance and convective heat transfer. Besides, the lattice mismatch between c-axis-oriented Sb2Te3 and bridge sites of graphene was only 4%, which is also favorable for the graphene-templated Sb2Te3 synthesis. c-Axis-oriented single-crystalline Sb2Te3 NPs as large as 7 mu m could be successfully synthesized on graphene with negligible damage of the graphene template. Larger surface coverage could be obtained by merging Sb2Te3 NPs. The merged Sb2Te3 NPs were polycrystalline with rotated grain boundaries. This work provides a facile, rapid, and low-cost synthesis route of c-axis-oriented Sb2Te3 NPs on graphene templates, which may be extended for the synthesis of various two-dimensional materials with hexagonally closed-packed atomic layers along the c-axis.</P>
Singh, Swati,Kim, Seongkyun,Jeon, Wonjae,Dhakal, Krishna P.,Kim, Jeongyong,Baik, Seunghyun Elsevier 2019 Carbon Vol.153 No.-
<P><B>Abstract</B></P> <P>The electrical and thermal transport at the interface of hetero-structures plays a critical role in device performance. Here, we successfully grew single-crystalline Sb<SUB>2</SUB>Te<SUB>3</SUB> nanoplates (NPs) on graphene by the solvothermal method due to the small lattice mismatch (∼4%) between c-axis aligned rhombohedral Sb<SUB>2</SUB>Te<SUB>3</SUB> and bridge sites of graphene. The growth of Sb<SUB>2</SUB>Te<SUB>3</SUB> NPs was bound by the graphene grain boundary, and the average size of Sb<SUB>2</SUB>Te<SUB>3</SUB>NPs increased from 2.2 to 8.8 μm, with a maximum of 21 μm, as the graphene grain size increased from 2.2 to 9.4 μm. The Ohmic contact was realized between the Sb<SUB>2</SUB>Te<SUB>3</SUB> NP and graphene. However, a limited thermal boundary conductance (<I>K</I> <SUB> <I>BD</I> </SUB>, average and maximum:13.45 and 17.69 MW m<SUP> <I>−2</I> </SUP> K<SUP> <I>−</I>1</SUP>) was observed by Raman thermometry due to the large acoustic mismatch (Debye temperature difference = 1935 K). Both small lattice and acoustic mismatch was required to achieve high <I>K</I> <SUB> <I>BD</I> </SUB>. The electrical and thermal contact was poor (average and minimum <I>K</I> <SUB> <I>BD</I> </SUB>: 0.16 and 0.08 MW m<SUP> <I>−2</I> </SUP> K<SUP> <I>−</I>1</SUP>) when Sb<SUB>2</SUB>Te<SUB>3</SUB> NPs were separately synthesized and drop-deposited on graphene. This demonstrated that the direct growth of Sb<SUB>2</SUB>Te<SUB>3</SUB> on graphene was very important, rather than the simple transfer method, to achieve good electrical and thermal contact at the interface of hetero-structures.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Swati Singh,Sheifali Gupta 보안공학연구지원센터 2016 International Journal of Bio-Science and Bio-Techn Vol.8 No.4
The proposed paper surveys different techniques for early spotting and classification of diseased plant using digital image processing. As in agribusiness, agriculturists detect plant diseases straight through the bare eyes. This type of detection requires continuum supervisory which can be expensive as well as time consuming on large farms. Therefore, recognizing the disease on plants is of extreme importance in agriculture sector. The selected proposal is divided into three classes: detection, classification and extraction. The three classes are further sub divided according to the different algorithm. This paper provides an overview of different image processing techniques and classification methods.
장민규(Mingyu Jang),Swati Singh(Swati Singh ),서준기(Joonki Suh) 한국세라믹학회 2023 세라미스트 Vol.26 No.1
Understanding thermal energy transport of crystalline materials, often highly dependent on their crystalline directions, is crucial for energy harvesting and thermal management applications. In this sense, anisotropy in thermal conductivity (κ), which is the unique characteristic of two-dimensional (2D) materials involving graphene and transition metal dichalcogenides (TMDs), has been attracting tremendous attention in terms of fundamental science and application-driven technology aspects. This distinctive heat transport behavior of 2D van der Waals (vdW) materials generally originates from their intrinsic crystal structures and associated lattice vibrations. Here, we thoroughly review and summarize the anisotropic thermal conductivity in 2D vdW crystals in two different categories: 1) in-plane vs. out-of-plane and 2) between two different in-plane directions. In addition, we introduce a range of thermal conductivity measurement techniques that can be employed for 2D vdW materials provided with their working principles, advantages, and limitations. Beyond their intrinsic anisotropic ratio, we conclude with perspectives on the extrinsic modulations of thermal conductivities, thereby maximizing it toward effective thermal management.
( Jain Swati S. Ponmariappan ),( Om Kumar ),( Lokendra Singh ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.7
Botulism is a neuroparalytic disease caused by Clostridium botulinum, which produces seven (A-G) antigenically diverse neurotoxins (BoNTs). BoNTs are the most poisonous substances known to humans, with a median lethal dose (LD50) of approximately 1 ng/kg of body weight. Owing to their extreme potency and lethality, they have the potential to be used as a bioterrorism agent. The mouse bioassay is the gold standard for the detection of botulinum neurotoxins; however, it requires at least 3-4 days for completion. Attempts have been made to develop an ELISA-based detection system, which is potentially an easier and more rapid method of botulinum neurotoxin detection. The present study was designed using a synthetic gene approach. The synthetic gene encoding the catalytic domain of BoNT serotype B from amino acids 1-450 was constructed with PCR overlapping primers (BoNT/B LC), cloned in a pQE30 UA vector, and expressed in an E. coli M15 host system. Recombinant protein production was optimized at 0.5 mM IPTG final concentration, 4 h post induction, resulting in a maximum yield of recombinant proteins. The immunogenic nature of the recombinant BoNT/B LC protein was evaluated by ELISA. Antibodies were raised in BALB/c mice using various adjuvants. A significant rise in antibody titer (p<0.05) was observed in the Alum group, followed by the Titermax Classic group, Freund`s adjuvant, and the Titermax Gold group. These developed high-titer antibodies may prove useful for the detection of botulinum neurotoxins in food and clinical samples.
The current approach to the diagnosis of vascular anomalies of the head and neck: A pictorial essay
Sinny Goel,Swati Gupta,Aarti Singh,Anjali Prakash,Sujoy Ghosh,Poonam Narang,Sunita Gupta 대한영상치의학회 2015 Imaging Science in Dentistry Vol.45 No.2
Throughout the years, various classifications have evolved for the diagnosis of vascular anomalies. However, it remains difficult to classify a number of such lesions. Because all hemangiomas were previously considered to involute, if a lesion with imaging and clinical characteristics of hemangioma does not involute, then there is no subclass in which to classify such a lesion, as reported in one of our cases. The recent classification proposed by the International Society for the Study of Vascular Anomalies (ISSVA, 2014) has solved this problem by including non-involuting and partially involuting hemangioma in the classification. We present here five cases of vascular anomalies and discuss their diagnosis in accordance with the ISSVA (2014) classification. A non-involuting lesion should not always be diagnosed as a vascular malformation. A non-involuting lesion can be either a hemangioma or a vascular malformation depending upon its clinicopathologic and imaging characteristics.
Patterns of Cancer: A Study of 500 Punjabi Patients
Bal, Manjit Singh,Bodal, Vijay Kumar,Kaur, Jaspreet,Kaur, Mohanvir,Sharma, Swati Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.12
The State of Punjab has been in focus because of aperceived increasing rate of cancer. Both print and electronic media have created an impression that Punjab, especially the cotton belt of Malwa Region, has become a high incidence cancer region. Actually the increased number of cancer patients might be at least partly because of increasing population and heightened health awareness and reporting. The purpose of this study is to find out the pattern of cancer amongst patients registered in Mukh Mantri Punjab Cancer Rahat Kosh Scheme (MMPCRKS), under cancer registry at Rajindra Hospital Patiala from the various districts of Punjab. The study covers 500 cancer patients registered under MMPCRKS at Rajindra Hospital Patiala, for free cancer treatment. Information regarding age, gender, religion, method of diagnosis and affected sites was obtained. Results were analyzed statistically. Of the 500 patients, 65% were females and 35% were males. The most affected female age groups were 50-54 and 60-64; while males in the age groups of 65-69 and 60-64 had the highest risk. The leading cancers in females were breast followed by cervix and ovary where as in males they were were colon followed by esophagus and tongue. The commonest histological type was adenocarcinoma followed by squamous cell carcinoma. The increasing trend of cancer in Punjab is alarming. Since this study is a preliminary investigation, it could provide a leading role in prevention, treatment and future planning regarding cancer in Punjab.
Preeti Kumari,Swati Sinha,Renuka Gahtori,Afshana Quadiri,Paras Mahale,Deepali Savargaonkar,Veena Pande,Bina Srivastava,Himmat Singh,Anupkumar R. Anvikar 대한기생충학ㆍ열대의학회 2022 The Korean Journal of Parasitology Vol.60 No.4
Malaria elimination and control require prompt and accurate diagnosis for treatment plan. Since microscopy and rapid diagnostic test (RDT) are not sensitive particularly for diagnosing low parasitemia, highly sensitive diagnostic tools are required for accurate treatment. Molecular diagnosis of malaria is commonly carried out by nested polymerase chain reaction (PCR) targeting 18S rRNA gene, while this technique involves long turnaround time and multiple steps leading to false positive results. To overcome these drawbacks, we compared highly sensitive cytochrome oxidase gene-based single-step multiplex reaction with 18S rRNA nested PCR. Cytochrome oxidase (cox) genes of P. falciparum (cox-III) and P. vivax (cox-I) were compared with 18S rRNA gene nested PCR and microscopy. Cox gene multiplex PCR was found to be highly specific and sensitive, enhancing the detection limit of mixed infections. Cox gene multiplex PCR showed a sensitivity of 100% and a specificity of 97%. This approach can be used as an alternative diagnostic method as it offers higher diagnostic performance and is amenable to high throughput scaling up for a larger sample size at low cost.