Revision of Dolabraulax Quicke (Hymenoptera: Braconidae) with the description of three new species from south India

A.P. Ranjith,Junli Yao,Dharma Rajan Priyadarsanan,Donald L.J. Quicke,M. Nasser 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.2

The braconine genus, Dolabraulax Quicke is reported for the first time from the Indian sub-continent and three new species, namely D. aruni Ranjith sp. nov., D. athirae Ranjith sp. nov. and D. jalalae Ranjith sp. nov. are described and illustrated. A key to all species of Dolabraulax is provided and its generic diagnosis is revised.

Two new species of Conobregma van Achterberg, 1995 (Hymenoptera: Braconidae, Rogadinae) from India and Thailand

Ranjith A.P.,Quicke Donald L.J.,Mithun V.,Pradeep N.S.,Butcher Buntika A.,Priyadarsanan Dharma Rajan 한국응용곤충학회 2024 Journal of Asia-Pacific Entomology Vol.27 No.1

The rogadine genus Conobregma is newly reported from India and Thailand. We describe two new species, C. embigi Ranjith from India and C. lek Ranjith from Thailand. Key to the Old World species is provided with the illustration of new species. LSID: urn:lsid:zoobank.org:pub:416406EE-855A-473F-A4E9-A0268115854E.

First record of the genus Leluthia Cameron, 1887 (Hymenoptera: Braconidae, Doryctinae) in the Oriental region with description of two new species from India

Belokobylskij Sergey A.,Ranjith A.P.,P. Girish Kumar,Priyadarsanan Dharma Rajan 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.4

The genus Leluthia Cameron, 1887 is recorded for the first time from the Oriental region. Two new species, Leluthia (Euhecabolodes) areola Ranjith et Belokobylskij, sp. nov. and L.(E.) indica Belokobylskij et Ranjith, sp. nov. are described and illustrated from the Indian states Kerala and Goa, respectively. The new species are most similar to the Western Palaearctic Hecabolus hungaricus (Szépligeti, 1900), which is reinstated from its synonymy with Polystenus and transferred to the genus Leluthia Cameron (stat. resurr. and comb. nov.).

Numerical study on the rotation of an elastic rod in a viscous fluid using an immersed boundary method

Ranjith Maniyeri,강상모 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.5

"We present a three–dimensional computational model based on an immersed boundary (IB) method to study the hydrodynamic features of a solid flexible cylindrical rod in a viscous fluid driven at one side by a tiny motor. The elastic rod is modelled by a number of circular cross-sections with twelve IB points on each cross-section. Three types of elastic links are created from each IB point to obtain an elastic network model of the rod and the first cross-section is modelled as the motor part. The elastic forces are computed based on an elastic energy approach and the motor forces are obtained from the applied angular frequency of rotation of the motor. The Stokes equations governing the fluid are solved on a staggered Cartesian grid system using the fractional-step based finite-volume method. Numerical simulations are performed to demonstrate the three dynamical stages of rod motion- twirling, whirling and overwhirling for different rotational frequency of the motor. It is revealed that for low rotational frequencies, the rod undergoes stable rigid body motion known as twirling. For high rotational frequencies of the motor, it is observed that the rod initially undergoes whirling motion and attains an unstable helical shape. Further, it is noticed that a discontinuous shape transition occurs for the rod and it folds back on itself. This unstable motion is referred to as overwhirling. It is also found that there exists a critical value of angular frequency of rotation of the motor below which the rod is subjected to twirling motion and above which it undergoes overwhirling motion."

Flower-like Cu_1.8S nanostructures for high-performance flexible solid-state supercapacitors

Ranjith Kumar, Deivasigamani,Kesavan, Srinivasan,Baynosa, Marjorie Lara,Shim, Jae-Jin Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.448 No.-

<P><B>Abstract</B></P> <P>In wearable and portable electronic devices, small size, light weight, flexibility, and easy operability are necessary for energy storage systems, such as battery and supercapacitor. To improve the performance, high specific capacity and high energy and power densities are also required. In this study, flower-like Cu<SUB>1.8</SUB>S nanostructures are synthesized from a single source tris(thiourea)copper(I) chloride complex precursor. The different-sized Cu<SUB>1.8</SUB>S nanostructures with flower-like petal morphology are successfully synthesized by addition of capping agents such as sodium dodecyl sulfate (SDS) and ethylenediaminetetraacetic acid (EDTA) with ethylene glycol (EG) as a solvent. The petal thicknesses vary from 60 to 30 nm, resulting in the increase in its specific surface area. The as-prepared nanostructures are tested for their supercapacitor performances in KOH electrolyte medium. The EDTA-Cu<SUB>1.8</SUB>S electrode provides a high specific capacitance of 1050.0 F g<SUP>−1</SUP> as compared with SDS-Cu<SUB>1.8</SUB>S (773.0 F g<SUP>−1</SUP>) and EG-Cu<SUB>1.8</SUB>S (625.4 F g<SUP>−1</SUP>). Flexible solid-state symmetric supercapacitors are also fabricated from EDTA-Cu<SUB>1.8</SUB>S which deliver a high volumetric capacitance (4.5 F cm<SUP>−3</SUP>) and energy density (0.5 mWh cm<SUP>−3</SUP>).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Flower-like Cu<SUB>1.8</SUB>S was synthesized from tris(thiourea)copper(I)chloride complex. </LI> <LI> Flower-like Cu<SUB>1.8</SUB>S with different petal morphology was prepared. </LI> <LI> A flexible SSC decorated with 3D flower-like Cu<SUB>1.8</SUB>S was prepared. </LI> <LI> Flower-like Cu<SUB>1.8</SUB>S SSC with thinner petal thickness showed high capacitance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Facile Nanostructured Composite Synthesis of Selenium and Molybdenum Chalcogenides/Carbon Nanotubes for Li-Ion Batteries

Ranjith Bose,김재민,김태현,고범수,고낙규,문준영,이성철 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.11

For lithium-ion batteries (LIBs), MoS2, which has conversion reaction pathways that can accommodate lithium ions during charge, is a very special inorganic material that has a two-dimensional planar structure similar to graphite. For reliable performance of high-energy LIBs, Se–molybdenum chalcogenides with sulfide and selenide (Se–MC) were prepared via the incorporation of a carbon nanotube (CNT) conducting matrix to solve the crucial limitations of MoS2, which include poor electronic conductivity and severe volume changes during cycling. For the preparation of Se–MC/CNT, a facile, one-pot synthetic method using molybdic acid, selenium dioxide, and thioacetamide, which are the precursors for molybdenum, selenide, and sulfide, respectively, and CNT was developed. A detailed investigation of the surfaces and crystal structures of the prepared samples was conducted using transmission electron microscopy and X-ray photoelectron spectroscopy analyses. Furthermore, LIBs containing the Se–MC/CNT exhibited a significantly extended cycle life and an improved rate capability that revealed the synergetic effect of the CNTs and selenide for controlling the morphology.

A new species of Ceylonitermellus Emerson, 1960 (Blattodea: Termitidae: Nasutitermitinae) from India with a key to the genus

Ranjith M.,Kalleshwaraswamy C.M.,Meghana K.J.,Santhrupthi B. 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.2

Ceylonitermellus Emerson is a rarely collected soil inhabiting nasute termite endemic to Oriental region with three known species. A fourth species, Ceylonitermellus sahyadriensis sp. nov. is described and illustrated based on morphological characters of soldier and gut morphology of workers. Both the castes have poorly sclerotized body and paler in colour. This is the second species from India and fourth species of the genus from world. The species can be distinguished from the closely related C. periyarensis by the pyriform and shorter head capsule and with other two species of the genus by its larger head capsule as compared to C. kotuae and smaller head capsule as compared to C. hantanae. The new species was collected from tropical evergreen forest from a small colony near the base of a tree. LSID: urn:lsid:zoobank.org:pub:34616357-2CC9-46B2-8B8D-3CFD984CED89.

Computational Investigation of Lightning Strike Effects on Aircraft Components

Ranjith, Ravichandran,Myong, Rho Shin,Lee, Sangwook The Korean Society for Aeronautical and Space Scie 2014 International Journal of Aeronautical and Space Sc Vol.15 No.1

A lightning strike to the aircraft seriously affects the aircraft and its components in various ways. As one of the most critical threats to the flight safety of an aircraft, fuel vapour ignition by lightning can occur through various means, notably through hot spot formation on the fuel tank skins. In this study, a coupled thermal-electrical approach using the commercial software ABAQUS is used to study the effects of a lightning strike on aircraft fuel tanks. This approach assumes that the electrical conductivity of a material depends on temperature, and that a temperature rise in a material due to Joule heat generation depends on electrical current. The inter-dependence of thermal and electrical properties-the thermal-electrical coupling-is analyzed by a coupled thermal-electrical analysis module. The analysis elucidates the effects of different material properties and thicknesses of tank skins and identifies the worst case of lightning zones.

Temporary Placement of Stent Grafts in Postsurgical Benign Biliary Strictures: a Single Center Experience

Ranjith Vellody,Jonathon M Willatt,Mohammad Arabi,Wojciech B Cwikiel 대한영상의학회 2011 Korean Journal of Radiology Vol.12 No.6

Objective: To evaluate the effect of temporary stent graft placement in the treatment of benign anastomotic biliary strictures. Materials and Methods: Nine patients, five women and four men, 22-64 years old (mean, 47.5 years), with chronic benign biliary anastomotic strictures, refractory to repeated balloon dilations, were treated by prolonged, temporary placement of stent-grafts. Four patients had strictures following a liver transplantation; three of them in bilio-enteric anastomoses and one in a choledocho-choledochostomy. Four of the other five patients had strictures at bilio-enteric anastomoses, which developed after complications following laparoscopic cholecystectomies and in one after a Whipple procedure for duodenal carcinoma. In eight patients, balloon-expandable stent-grafts were placed and one patient was treated by insertion of a self-expanding stent-graft. Results: In the transplant group, treatment of patients with bilio-enteric anastomoses was unsuccessful (mean stent duration, 30 days). The patient treated for stenosis in the choledocho-choledochostomy responded well to consecutive self-expanding stent-graft placement (total placement duration, 112 days). All patients with bilio-enteric anastomoses in the non-transplant group were treated successfully with stent-grafts (mean placement duration, 37 days). Conclusion: Treatment of benign biliary strictures with temporary placement of stent-grafts has a positive effect, but is less successful in patients with strictures developed following a liver transplant. Objective: To evaluate the effect of temporary stent graft placement in the treatment of benign anastomotic biliary strictures. Materials and Methods: Nine patients, five women and four men, 22-64 years old (mean, 47.5 years), with chronic benign biliary anastomotic strictures, refractory to repeated balloon dilations, were treated by prolonged, temporary placement of stent-grafts. Four patients had strictures following a liver transplantation; three of them in bilio-enteric anastomoses and one in a choledocho-choledochostomy. Four of the other five patients had strictures at bilio-enteric anastomoses, which developed after complications following laparoscopic cholecystectomies and in one after a Whipple procedure for duodenal carcinoma. In eight patients, balloon-expandable stent-grafts were placed and one patient was treated by insertion of a self-expanding stent-graft. Results: In the transplant group, treatment of patients with bilio-enteric anastomoses was unsuccessful (mean stent duration, 30 days). The patient treated for stenosis in the choledocho-choledochostomy responded well to consecutive self-expanding stent-graft placement (total placement duration, 112 days). All patients with bilio-enteric anastomoses in the non-transplant group were treated successfully with stent-grafts (mean placement duration, 37 days). Conclusion: Treatment of benign biliary strictures with temporary placement of stent-grafts has a positive effect, but is less successful in patients with strictures developed following a liver transplant.

2LN-7 Enhancing hydrogen evolution activity of molybdenum sulphoselenide by surface modification with phosphide

( Ranjith Bose ),이성철 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1

Development of highly active, cost effective, stable and earth abundant electrocatalyst for hydrogen evolution reaction (HER) is still a major challenge for energy conversion technologies. At present, MoS₂ and its derivatives have attracted intensive interest due to its excellent catalytic performance. However, improving the overall catalytic activity of structural modified MoS₂ is still remains a key challenge for further reducing a overpotential for the HER of electrochemical water splitting. In this regard, we report a surface modified molybdenum sulphoselenide with phosphorous on carbon fiber paper (P-MoS_xSe_y/CFP) for the HER. Remarkably, P-MoS_xSe_y/CFP electrode delivered a low over potential (η) of 93 mV at a current density (j) of 10 mA/㎠ in 0.5M H₂SO₄, when compared with MoS₂/CFP (η=242 mV @ 10 mA/cm2), MoS_xSe_y/CFP (η=200 mV @ 10 mA/㎠). Moreover, the observed HER activity of P-MoS_xSe_y/CFP has outperformed over the current molybdenum phosphides and chalcogenides catalysts