A novel CdTe/Eu-MOF photoanode for application in quantum dot-sensitized solar cell to improve power conversion efficiency

Kaur, R.,Sharma, A.L.,Kim, K.H.,Deep, A. THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2017 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.53 No.-

The quantum dots (QDs) and metal-organic frameworks (MOFs) have emerged as the efficient nanomaterials for light harvesting, photocatalysis, and photovoltaic applications. Here, the application of a composite of CdTe QDs with a europium-MOF was demonstrated as a novel photoanode to achieve the improvement in the short circuit current density from 19.8 (CdTe QD) to 28.45mA/cm<SUP>2</SUP> (CdTe QD/Eu-MOF). So does power conversion efficiency (PCE) between the former (1.67%) and the latter (3.02%). This 1.35% of difference (or absolute enhancement) in the PCE can be attributed to an enhanced surface area and increased photon absorption capacity.

Recent advances in the photovoltaic applications of coordination polymers and metal organic frameworks

Kaur, Rajnish,Kim, Ki-Hyun,Paul, A. K.,Deep, Akash The Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.11

<▼1><P>Coordination polymers and metal organic frameworks (CPs/MOFs) have attracted a great deal of attention in a variety of scientific fields due to their unique and intriguing structural properties.</P></▼1><▼2><P>Coordination polymers and metal organic frameworks (CPs/MOFs) have attracted a great deal of attention in a variety of scientific fields due to their unique and intriguing structural properties. Photovoltaic applications of these porous polymers belong to a relatively new area of research. The current status of research on this subject amply highlights the usefulness of CPs/MOFs in improving the properties of next-generation photovoltaic devices (<I>e.g.</I>, dye-sensitized solar cells). This review article was written to cover the recent advancements that have been achieved in this rapidly expanding area of research. It also compares and contrasts the energy conversion efficiencies in photovoltaic applications using different MOFs and other systems.</P></▼2>

Non-covalent functionalization of graphene with poly(diallyl dimethylammonium) chloride: Effect of a non-ionic surfactant

Kaur, P.,Shin, M.S.,Sharma, N.,Kaur, N.,Joshi, A.,Chae, S.R.,Park, J.S.,Kang, M.S.,Sekhon, S.S. Pergamon Press ; Elsevier Science Ltd 2015 International journal of hydrogen energy Vol.40 No.3

Carbon based nanomaterials (carbon nanotubes, graphene etc) containing various hetero atoms are promising metal free catalysts for oxygen reduction reaction in fuel cells. We report the non-covalent functionalization of graphene with poly(diallyl dimethylammonium) chloride (PDDA), a polyelectrolyte containing nitrogen, using a very simple method. The addition of a non-ionic surfactant (Triton X-100) during functionalization has been observed to improve the interactions between graphene and PDDA. An up-shift in the position of G-peak in the Raman spectra, down-shift in the binding energy (B.E.) of N1s peak and an up-shift in the B.E. of C1s peak in XPS spectra have been observed due to an inter-molecular charge-transfer from carbon in graphene to nitrogen in PDDA, which get enhanced in the presence of Triton X-100. Graphene functionalized with PDDA also show good thermal stability. The addition of a non-ionic surfactant enhances the non-covalent functionalization of graphene with PDDA, which is desirable from applications point of view.

Efficient photocatalytic degradation of rhodamine 6G with a quantum dot-metal organic framework nanocomposite

Kaur, R.,Vellingiri, K.,Kim, K.H.,Paul, A.K.,Deep, A. Pergamon Press 2016 CHEMOSPHERE - Vol.154 No.-

The hybrid structures of metal organic frameworks (MOFs) and nanoparticles may offer the realization of effective photocatalytic materials due to combined benefits of the porous and molecular sieving properties of MOF matrix and the functional characteristics of encapsulated nanoparticles. In this study, cadmium telluride (CdTe) quantum dots (QD) are conjugated with a europium-MOF for the synthesis of a novel nanocomposite material with photocatalytic properties. Successful synthesis of a QD/Eu-MOF nanocomposite was characterized with various spectroscopic and microscopic techniques. This QD/Eu-MOF is found to be an effective catalyst to complete the degradation of Rhodamine 6G dye within 50 min.

Nonlinear Propagation of a Short-Pulse Laser in a Plasma with Density Ripple

Sukhdeep Kaur,A. K. Sharma,C. M. Ryu 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6

In recent experiments, density ripples have been used to achieve phase-matched harmonic generation from plasmas. We report a numerical study of nonlinear propagation of an intense short-pulse laser in a plasma containing a large-amplitude density ripple. The laser with a Gaussian distribution of the intensity along its wavefront undergoes periodic self focusing due to relativistic and ponderomotive nonlinearity. In the region of high plasma density, the self-focusing effect dominates over the diffraction effect and the laser converges. As the beam enters the low-density region, the diffraction effect supercedes the self-focusing effect and diverges the beam. For ripple periods shorter than the Rayleigh diffraction length, the beam width parameter has a minor wiggle as a function of the distance of propagation. When the ripple period is long, the wiggle in the beam width parameter becomes large.

Classical Imaging Triad in a Very Young Child with Swyer-James Syndrome

Damle, Nishikant A.,Mishra, Rohini,Wadhwa, Jasmeet Kaur The Korea Society of Nuclear Medicine 2012 핵의학 분자영상 Vol.46 No.2

Swyer-James syndrome (SJS) or Swyer-James-MacLeod syndrome is a rare disorder characterized by roentgenographical hyperlucency of one lung, lobe, or part of a lobe. As originally described, it shows a unilateral small lung with hyperlucency and air trapping on radiographs. It is postinfectious obliterative bronchiolitis due to childhood respiratory infection. In SJS, the involved lung or portion of the lung does not grow normally. The characteristic radiologic appearance is that of pulmonary hyperlucency on chest X-ray/CT caused by over-distention of the alveoli in conjunction with diminished arterial flow detected on Tc-99 m MAA pulmonary perfusion scan. Radionuclide pulmonary ventilation studies are considered difficult to perform in very young children as patient co-operation is crucial to achieve adequate tracer entry into the lungs. We present here the case of a female child aged 2 years, who presented with chronic productive cough and fever off and on for 1.5 years. She had classical features on imaging and markedly diminished ventilation on Tc-99 m DTPA aerosol study. Our case highlights the typical findings on ventilationperfusion scan (V/Q scan) and suggests that it is possible to conduct a satisfactory ventilation study with Tc-99 m DTPA aerosol even in very young children.

Earthquake Response of Mid-rise to High-rise Buildings with Friction Dampers

Kaur, Naveet,Matsagar, V.A.,Nagpal, A.K. Council on Tall Building and Urban Habitat Korea 2012 International journal of high-rise buildings Vol.1 No.4

Earthquake response of mid-rise to high-rise buildings provided with friction dampers is investigated. The steel buildings are modelled as shear-type structures and the investigation involved modelling of the structures of varying heights ranging from five storeys to twenty storeys, in steps of five storeys, subjected to real earthquake ground motions. Three basic types of structures considered in the study are: moment resisting frame (MRF), braced frame (BF), and friction damper frame (FDF). Mathematical modelling of the friction dampers involved simulation of the two distinct phases namely, the stick phase and the slip phase. Dynamic time history analyses are carried out to study the variation of the top floor acceleration, top floor displacement, storey shear, and base-shear. Further, energy plots are obtained to investigate the energy dissipation by the friction dampers. It is seen that substantial earthquake response reduction is achieved with the provision of the friction dampers in the mid-rise and high-rise buildings. The provision of the friction dampers always reduces the base-shear. It is also seen from the fast Fourier transform (FFT) of the top floor acceleration that there is substantial reduction in the peak response; however, the higher frequency content in the response has increased. For the structures considered, the top floor displacements are lesser in the FDF than in the MRF; however, the top floor displacements are marginally larger in the FDF than in the BF.

Effect of trigger day serum luteinising hormone levels on the in-vitro fertilization outcome: an observational study

Harpreet Kaur,Gautham T Pranesh,Vyshnavi Rao,Kamini A Rao 대한산부인과학회 2024 Obstetrics & Gynecology Science Vol.67 No.2

Objective Controlled ovarian stimulation leads to profound changes in the endocrine characteristics of the ovarian cycle. Serum luteinising hormone (LH) levels on the day of trigger have been shown to correlate with oocyte quality and pregnancy rate in antagonist cycles. Methods This is an observational study of 86 women undergoing an antagonist in-vitro fertilisation cycle. Oocyte maturation trigger used was either Inj. human chorionic gonadotropin or Inj. triptorelin 0.2 mg s/c or a combination of both. Women were categorised into four groups based on serum LH levels on the day of trigger i.e., LH ≤0.5 (n=8), LH=0.6- 1.0 international units (IU)/L (n=12), LH=1.0-1.5 IU/L (n=13), and LH >1.6 IU/L (n=53) and the subgroup analysis was done based on type of trigger used. Results Mature oocyte (MII) retrieval rate did not show a significant relation with serum LH levels (87%, 89%, 77%, and 76% in groups with LH <0.5, 0.5-1.0, 1.0-1.5, and >1.5 IU/L respectively; P-value=0.243). There was no significant difference in the clinical pregnancy rate either when women were split according to the type of trigger given or according to trigger day LH levels. Women with low LH levels (<0.5 IU/L) required significantly more doses of gonadotropins compared to women with LH levels of 1.0-1.5 IU/L. (3,531+1,133 vs. 2,281+938; P-value=0.01). Conclusion Based on the observation from the current study, there was no significant association of serum LH levels with MII retrieval rate and clinical pregnancy rate. The group with low LH levels required slightly longer days of stimulation. Objective Controlled ovarian stimulation leads to profound changes in the endocrine characteristics of the ovarian cycle. Serum luteinising hormone (LH) levels on the day of trigger have been shown to correlate with oocyte quality and pregnancy rate in antagonist cycles.Methods This is an observational study of 86 women undergoing an antagonist <i>in-vitro</i> fertilisation cycle. Oocyte maturation trigger used was either Inj. human chorionic gonadotropin or Inj. triptorelin 0.2 mg s/c or a combination of both. Women were categorised into four groups based on serum LH levels on the day of trigger i.e., LH ≤0.5 (n=8), LH=0.6- 1.0 international units (IU)/L (n=12), LH=1.0-1.5 IU/L (n=13), and LH >1.6 IU/L (n=53) and the subgroup analysis was done based on type of trigger used.Results Mature oocyte (MII) retrieval rate did not show a significant relation with serum LH levels (87%, 89%, 77%, and 76% in groups with LH <0.5, 0.5-1.0, 1.0-1.5, and >1.5 IU/L respectively; <i>P</i>-value=0.243). There was no significant difference in the clinical pregnancy rate either when women were split according to the type of trigger given or according to trigger day LH levels. Women with low LH levels (<0.5 IU/L) required significantly more doses of gonadotropins compared to women with LH levels of 1.0-1.5 IU/L. (3,531+1,133 vs. 2,281+938; <i>P</i>-value=0.01).Conclusion Based on the observation from the current study, there was no significant association of serum LH levels with MII retrieval rate and clinical pregnancy rate. The group with low LH levels required slightly longer days of stimulation.

Managing EGFR Mutant Lung Adenocarcinoma with Tyrosine Kinase Inhibitors: A Pulmonology-centered Approach at a Tertiary Facility in Northern Malaysia

( Kughanishah Jeyabalan ),( Kezreen Kaur Dhaliwal ),( Siti Farah Azwa Aliman ),( Mohd Faizul Abu Samah ),( Chan Tha A Hing ),( Arvindran Alaga ) 대한결핵 및 호흡기학회 2023 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.136 No.0

Salen decorated nanostructured ZnO chemosensor for the detection of mercuric ions (Hg²⁺)

Sharma, S.K.,Kaur, N.,Singh, J.,Singh, A.,Raj, P.,Sankar, S.,Kim, D.Y.,Singh, N.,Kaur, N.,Singh, H. Elsevier Sequoia 2016 Sensors and actuators. B Chemical Vol.232 No.-

Self-assembled ZnO nanoparticles, nanodumbbells and nanorod/nanowire flowers were synthesized by the hydrothermal precipitation method, and tested them for the detection of mercuric ions (Hg<SUP>2+</SUP>) as the chemosensor. Various techniques like X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM) and photoluminescence (PL) were employed for the characterization of nanostructured ZnO powder. The surface of nanostructured ZnO was decorated with salen prepared from reported procedure. The binding ability of different nanostructured ZnO complexes with salen was tested by screening them with various metal ion solutions. The prepared solution of various ZnO complexes showed the selective affinity for mercuric ions, without having any interference from other potential interferent metal ions. The prepared complexes had a variable response and the selectivity for mercury ions, having the lowest detection limits of 20nM (nanoparticle), 18nM (nanodumbbell), 35nM (nanorod flowers) and 10nM (nanowire flowers), respectively. The detection limit/range of prepared complexes was varied with respect to the microstructures: (i) nanoparticles showed a larger dynamic range as they had more binding sites for Hg<SUP>2+</SUP> owing to more binding sites for salen, and (ii) the nanowire flowers detected the better detection limit due to its cluster nature.