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      • Phenol-formaldehyde-resin-based activated carbons with controlled pore size distribution for high-performance supercapacitors

        Talreja, Neetu,Jung, SungHoon,Yen, Le Thi Hai,Kim, TaeYoung Elsevier 2020 Chemical engineering journal Vol.379 No.-

        <P><B>Abstract</B></P> <P>Carbon-based materials with a controlled pore size distribution are highly desirable to achieve fast diffusion of electrolytes and enhance supercapacitor performance. Here, we report a method to effectively control porosity of the phenol formaldehyde (PF) resin-based carbons along with pore volume and pore size distribution using a combined metal templating and physical/chemical activation approach. The combined metal templating and physical/chemical activation approach allows the precise control of the pore size of the carbons. PF resin synthesized by suspension polymerization was used as a carbon source and metal ions (Fe<SUP>+</SUP> and Zn<SUP>+</SUP>) were used as templating agents. The pore size could be superbly tuned in the 2–50 nm range by varying the metal ion. Carbonization and CO<SUB>2</SUB> activation of the metal-embedded PF resins yielded carbon microparticles (M-CMP), which turned into carbon microparticles (M-CMP-S) having mesopores in the range of 35–51 nm by sonication and KOH activation. The specific capacitances of Fe-CMP-S and Zn-CMP-S were as high as 132 and 152 F g<SUP>−1</SUP> (58 and 74 F cm<SUP>−3</SUP>) in ionic liquid electrolyte with energy densities of 56 and 64 Wh kg<SUP>−1</SUP>, respectively. In organic electrolyte, the Zn-CMP-S showed the specific capacitance of 136 F g<SUP>−1</SUP> with a maximum power density of 709 kW kg<SUP>−1</SUP>. Adjustable pore size of the M-CMP-S facilitated the diffusion of electrolyte ions into the electrode, thereby achieving supercapacitor with high energy and power density.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Porous carbons with a controlled porosity and large pore volume were developed. </LI> <LI> Control over porosity was enabled by combined metal templating and activation. </LI> <LI> The resulting carbons were used as electrodes for supercapacitors. </LI> <LI> The supercapacitors showed both high energy density and power density. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

      • KCI등재

        Tailoring the Rheology of Shear Thickening Fluids by Regulating the Particle Size of Dispersed Phase for Enhancing the Impact Resistance of Aramid Fabrics

        Komal Talreja,Aranya Ghosh,Sanchi Arora,Abhijit Majumdar,Bhupendra Singh Butola 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5

        Rheological behaviour of shear thickening fluid (STF) is influenced by particle size, particle shape, concentrationof particles etc. This study deals with the effect of particle size and its distribution on the rheological behaviour of STFs andensuing impact resistance of Kevlar® fabrics treated with them. Synthesis of submicron sized silica particles of three differentsizes was carried out by following the Stöber method. Corresponding STFs consisting of 67 % silica particles were preparedand their rheological behaviour was evaluated. Decrease in particle size coupled with particle size uniformity significantlycontributes to enhancement in dilatancy of STFs. Further, Kevlar® fabric was impregnated with these STFs for assessing theirimpact resistance performance. Fabric impregnated with STF prepared from the finest and uniform silica particles, having thehighest peak viscosity, exhibited the best impact resistance performance among all STF impregnated fabrics. These findingsshow that the particle size and its distribution decisively influence the thickening behaviour of STF which in turn plays acritical role in determining the impact energy absorption by high-performance fabrics.

      • KCI등재

        Photodynamic Therapy in Unresectable Cholangiocarcinoma: Not for the Uncommitted

        Jayant P. Talreja,Marisa DeGaetani,Kristi Ellen,Timothy Schmitt,Monica Gaidhane,Michel Kahaleh 대한소화기내시경학회 2013 Clinical Endoscopy Vol.46 No.4

        Background/Aims: Photodynamic therapy (PDT) in unresectable cholangiocarcinoma has been associated with improved survival. We report a single tertiary care center experience over the past 6 years. Methods: Fifty-five patients with unresectable cholangiocarcinoma received PDT between 2004 and 2010. Plastic stents were placed after PDT to prevent cholangitis. Results: Twenty-seven patients (49%) showed Bismuth type IV, 22 (41%) showed Bismuth type III, and six (10 %) showed Bismuth type I and II. Twenty patients (37%) received chemotherapy and radiation therapy, five (9%) received chemotherapy only; and one (2%) received radiation therapy only. Mean number of PDT sessions was 1.9±1.5 sessions (range, 1 to 9). Mean survival duration was 293±266 days (median 190; range, 25 to 1,332). PDT related complications included three (5%) facial burn, three (5%) photosensitivity, and two (3%) rash. Kaplan-Meier analysis comparing the survival means of patients who received PDT and chemotherapy/radiation therapy (median survival 257 days; 95% confidence interval [CI], 166 to 528) versus who received PDT only (median survival 183 days; 95% CI, 129 to 224) showed no significant difference (log-rank p=0.20). Conclusions: PDT has a measurable impact on survival in unresectable cholangiocarcinoma but requires aggressive stenting post therapy.

      • SCIESCOPUSKCI등재

        Review : Photodynamic Therapy for Cholangiocarcinoma

        ( Jayant P. Talreja ),( Michel Kahaleh ) The Editorial Office of Gut and Liver 2010 Gut and Liver Vol.4 No.s1

        Cholangiocarcinoma is the primary malignancy arising from the biliary epithelium, and it presents as jaundice, cholestasis, and cholangitis. Over 50 percent of patients present with advanced-stage disease, and the prognosis is poor with the survival measured in months even after biliary decompression. Palliative management has become the standard of care for unresectable disease, and this involves an endoscopic approach. Photodynamic therapy (PDT) involves the administration of a photosensitizer followed by local irradiation with laser therapy. The use of PDT for palliation of bile-duct tumors has produced promising results. Several studies conducted in Europe and the United States have shown that PDT produces a marked improvement in the symptoms of cholestasis, survival, and quality of life. This chapter summarizes the principle of PDT, the technique employed, and the published experience regarding PDT for cholangiocarcinoma. (Gut Liver 2010;4(Suppl. 1):S62-66)

      • KCI등재

        Synthesis of reduced graphene oxide incorporated bimetallic (Cu/Bi) nanorods based photocatalyst materials for the degradation of gallic acid and bacteria

        Mohammad Ashfaq,Neetu Talreja,Divya Chauhan,C.A. Rodríguez,Adriana C. Mera,Mangalaraja Ramalinga Viswanathan 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-

        Gallic acid (GA) is a polyphenols compound commonly present in wastewater that immensely affectsaquatic and human life. GA is also responsible for the inhibitory effects on the microbial activity in thesoil, thereby decreasing the fertility of the soil. Therefore, the removal of GA from the wastewater is necessaryto combat such issues. The present study focused on the synthesis of reduced graphene oxide (r-GO) incorporated bimetallic (Cu/Bi) based nanorods (r-GO-Cu/Bi-NRs) and their photocatalytic applications. Incorporating GO within the CuBi2O4-NRs might decrease the bandgap value, thereby increasingthe interfacial charge transfer. Moreover, GO increased the reactive sites and oxygen defects onto ther-GO-Cu/Bi-NRs that led to the separation rate of the photo-induced charge carriers and migration,thereby enhancing the photodegradation ability of the synthesized r-GO-Cu/Bi-NRs. The synthesis processof the r-GO-Cu/Bi-NRs is facile, novel, and economically viable for the photocatalytic degradationof organic pollutants.

      • KCI등재

        Nickel nanoparticles-doped rhodamine grafted carbon nanofibers as colorimetric probe: Naked eye detection and highly sensitive measurement of aqueous Cr3+ and Pb2+

        Dinesh Kumar,Neetu Talreja 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.1

        Nickel nanoparticle (NiNPs)-doped carbon nanofiber (CNF) grafted with Rhodamine-B (RhB) dye (Ni- CNF-RhB), was prepared and utilized as a colorimetric probe for detection and measurements of chromium (Cr3+) and lead (Pb2+) metal ions in aqueous systems. An intense pink solution was obtained within 30 s on the exposure of the colorless Ni-CNF-RhB probe to the metal ions (Cr3+ and Pb2+) solution. Briefly, the NiNPs-doped carbon beads were synthesized and applied as a substrate to grow CNFs by chemical vapor deposition. The Ni-CNF-RhB colorimetric probe exhibited fast response and selective determination towards Cr3+ and Pb2+ over the 0.1-10 ppm concentration range of their respective solution pH. The developed probe also showed the pH-dependent colorimetric response, thereby, selectivity determination of the metal ions. The detection limits of the colorimetric probe against Cr3+ and Pb2+ are 203 and 132 nM, respectively. The binding ability of the RhB-dye was augmented by CNF and NiNPs, while the carbon beads provided support to CNF to help probe in detection application and its re-usability. The method to prepare the colorimetric probe is simple, novel, selective, and the probe can be efficiently used for the fast detection (naked eye) and measurements of toxic metal ions in aqueous systems.

      • KCI등재
      • KCI등재
      • KCI등재

        Microscopic varicocelectomy as a treatment option for patients with severe oligospermia

        Chirag Gupta,Arun Chinchole,Rupin Shah,Hemant Pathak,Deepa Talreja,Ankit Kayal 대한비뇨의학회 2018 Investigative and Clinical Urology Vol.59 No.3

        Purpose: Many studies have shown improved semen parameters after varicocele surgery; however, the benefit in terms of improved pregnancy rates and live births is still disputed in cases of severe oligoasthenozoospermia (OAS). The present study evaluated the outcome of microscopic subinguinal varicocelectomy in terms of the spontaneous pregnancy rate in patients with severe OAS. Materials and Methods: This was a retrospective, observational, analytic study of 56 men with OAS who underwent microscopic varicocelectomy at our center between 2008 and 2015. The subjects were followed for a mean period of 12.4 months. Outcome was compared among groups of men with mild (sperm concentration, 10.2–19 million/mL), moderate (5.7–9.5 million/mL), and severe (<5 million/mL) OAS who were operated on during the same period. Results: A total of 13 of 35 men (37.1%) with severe OAS achieved spontaneous pregnancy. Mean sperm density increased from 2.29 million/mL preoperatively to 14.09 million/mL postoperatively. The mean time to pregnancy from the date of surgery was 8.5 months. The spontaneous pregnancy rate in men with mild and moderate OAS was 62.5% and 46.2%, respectively. Conclusions: Although pregnancy rates after varicocele surgery are lower preoperatively in men with severe OAS than in men with mild or moderate OAS, the spontaneous pregnancy rate of 37.1% still compares very favorably with outcomes after a single attempt at in vitro fertilization.

      • SCOPUSKCI등재

        Perioperative Epirubicin, Oxaliplatin, and Capecitabine Chemotherapy in Locally Advanced Gastric Cancer: Safety and Feasibility in an Interim Survival Analysis

        Ostwal, Vikas,Sahu, Arvind,Ramaswamy, Anant,Sirohi, Bhawna,Bose, Subhadeep,Talreja, Vikas,Goel, Mahesh,Patkar, Shraddha,Desouza, Ashwin,Shrikhande, Shailesh V. The Korean Gastric Cancer Association 2017 Journal of gastric cancer Vol.17 No.1

        Purpose: Perioperative chemotherapy improves survival outcomes in locally advanced (LA) gastric cancer. Materials and Methods: We retrospectively analyzed patients with LA gastric cancer who were offered perioperative chemotherapy consisting of epirubicin, oxaliplatin, and capecitabine (EOX) from May 2013 to December 2015 at Tata Memorial Hospital in Mumbai. Results: Among the 268 consecutive patients in our study, 260 patients (97.0%) completed neoadjuvant chemotherapy, 200 patients (74.6%) underwent D2 lymphadenectomy, and 178 patients (66.4%) completed adjuvant chemotherapy. The median follow-up period was 17 months. For the entire cohort, the median overall survival (OS), 3-year OS rate, median progression-free survival (PFS), and 3-year PFS rate were 37 months, 64.4%, 31 months, and 40%, respectively. PFS and OS were significantly inferior in patients who presented with features of obstruction than in those who did not (P=0.0001). There was no difference in survival with respect to tumor histology (well to moderately differentiated vs. poorly differentiated, signet ring vs. non-signet ring histology) or location (proximal vs. distal). Survival was prolonged in patients with an early pathological T stage and a pathological node-negative status. In a multivariate analysis, postoperative pathological nodal status and gastric outlet obstruction on presentation significantly correlated with survival. Conclusions: EOX chemotherapy with curative resection and D2 lymphadenectomy is a suggested alternative to the existing perioperative regimens. The acceptable postoperative complication rate and relatively high resections, chemotherapy completion, and survival rates obtained in this study require further evaluation and validation in a clinical trial.

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