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Singh, Vijay,Sivaramaiah, G.,Singh, N.,Pathak, M.S.,Srivastava, Anoop K.,Rao, J.L.,Natarajan, V. Elsevier 2018 OPTIK -STUTTGART- Vol.171 No.-
<P><B>Abstract</B></P> <P>Al<SUB>2</SUB>O<SUB>3</SUB>:Gd<SUP>3+</SUP> phosphor was prepared using single step urea combustion method. The prepared phosphor was characterized by X-ray diffraction (XRD), photoluminescence (PL) and electron paramagnetic resonance (EPR) techniques. The formation of the combustion products was confirmed by the XRD analysis. PL studies showed that the Al<SUB>2</SUB>O<SUB>3</SUB>:Gd<SUP>3+</SUP> phosphor could be excited at 273/276 nm, while an ultraviolet (UV) emission centered at ∼ 314/317 nm was exhibited. The EPR spectrum of sample exhibited resonance signals due to Gd<SUP>3+</SUP> ion at low symmetry sites in the host lattice. Both PL as well as EPR studies of the sample confirmed the presence of Gd<SUP>3+</SUP> in the Al<SUB>2</SUB>O<SUB>3</SUB> matrix.</P>
Abhishek Srivastava,Rajat Mahajan,Ankur Nanda,Geetanjali Nanda,Nirajana Mishra,Vijayant Kanagaraju,Sahil Batra,Harvinder Singh Chhabra 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.5
Study Design: A retrospective computed tomography (CT)‒based morphometric study of 84 C1pedicles in an Indian population focusing on critical morphometric dimensions vis-a-vis C1 pedicle screw placement Purpose: To determine the feasibility of C1 pedicle screw placement in an Indian population and propose a novel classification system for the same. Overview of Literature: At present, C1 pedicle screws are rarely used, and very few studies have focused on the feasibility of pedicle screw placement in terms of racial, gender, and ethnic variations in anatomical structures. There are no CT-based data on C1 pedicles that assess the feasibility of pedicle screw placement in the Indian population. Methods: We measured C1 pedicle diameter on CT coronal scan images of 42 adult patients. Extramedullary height (EMH) and intramedullary height (IMH) were measured. We examined the differences between the right and left atlas pedicles and compared measures between males and females. These data were analyzed using significance tests. Based on the results, we propose a novel classification system, which we believe will help in determining the feasibility of C1 pedicle screw placement. Results: Forty-two adult patients (84 pedicles) were examined. Average EMH and IMH were 4.48±0.91 and 0.86±0.77, respectively. Approximately, 32% of the C1 pedicles had bone thicknesses of <4 mm, 49% had IMH of <1 mm, and 38% had no pedicles. The average thickness in women was 4.21±0.93 mm, which was significantly thinner than that in men (4.73±0.81 mm, p =0.004). Right and left pedicles were not significantly different. Conclusions: Our data indicate that approximately one-third of the Indian population may not be suitable candidates for C1 pedicle screw placement. Caution should be exercised while placing type 1B and type 2 pedicles based on our proposed classification system.
Singh, Vijay,Seshadri, M.,Singh, N.,Pathak, M.S.,Kumaran, R. Senthil,Choi, Yong-Keun,Singh, Pramod K.,Dhoble, S.J.,Srivastava, Anoop K. Elsevier 2016 Journal of luminescence Vol.176 No.-
<P><B>Abstract</B></P> <P>Combustion derived In<SUB>2</SUB>O<SUB>3</SUB>:Er<SUP>3+</SUP>, co-doped with Yb<SUP>3+</SUP>phosphor powders have been prepared. Powder X-ray diffraction, scanning electron microscopy, energy dispersive X-ray and Fourier transform infrared spectroscopy methods are used to characterize the prepared phosphor powders. The intensity parameters (<I>Ω<SUB>λ</SUB> </I>, <I>λ</I>=2, 4 and 6), radiative transition probabilities (<I>A<SUB>R</SUB> </I>), radiative lifetime (<I>τ<SUB>R</SUB> </I>) and branching ratios (<I>β</I>) of certain emission transition of Er<SUP>3+</SUP>ions for In<SUB>2</SUB>O<SUB>3</SUB>:Er<SUP>3+</SUP>and In<SUB>2</SUB>O<SUB>3</SUB>:Er<SUP>3+</SUP>/Yb<SUP>3+</SUP>phosphors have been estimated in the framework of the model given by Judd–Ofelt. Upon excitation at 978nm, upconversion luminescence properties of Er<SUP>3+</SUP>and Er<SUP>3+</SUP>/Yb<SUP>3+</SUP>doped In<SUB>2</SUB>O<SUB>3</SUB> phosphors are investigated. The results obtained from optical study confirm the existence of an effective Yb<SUP>3+</SUP>to Er<SUP>3+</SUP>energy transfer process and it also predict possible mechanisms to populate the <SUP>4</SUP>S<SUB>3/2</SUB> and <SUP>4</SUP>F<SUB>9/2</SUB> levels. The possible upconversion mechanisms are discussed for Er<SUP>3+</SUP>and Yb<SUP>3+</SUP>ions with energy level diagram.</P>
Seroma Formation after Breast Cancer Surgery: What We Have Learned in the Last Two Decades
Vivek Srivastava,Somprakas Basu,Vijay Kumar Shukla 한국유방암학회 2012 Journal of breast cancer Vol.15 No.4
Formation of a seroma most frequently occurs after mastectomy and axillary surgery. Prolonged drainage is troublesome as it increases the risk for infection and can significantly delay adjuvant therapy. Seroma has been defined as serous fluid collection under the skin flaps or in the axillary dead space following mastectomy and/or axillary dissection. Because the true etiology of a seroma is unknown, a multifactorial-causation hypothesis has been accepted. Surgical factors include technique, extent of dissection and the surgical devices used for dissection. Obliteration of dead space with various flap fixation techniques, use of sclerosants, fibrin glue and sealants, octreotide, and pressure garments have been attempted with conflicting results and none have been consistent. Early movement of the shoulder during the postoperative period may increase the formation of seroma, although delayed physiotherapy decreases the formation of seroma. A detailed analysis of the use of drains showed that use of single or multiple drains, early or late removal, and drains with or without suction are not significantly different for the incidence of seroma. Although there is evidence for reduced seroma formation after early drain removal, very early removal within 24 hours seems to increase formation of seroma. No patient or tumor factors seem to affect seroma formation except body mass index and body weight. Consensus is lacking among studies/trials with different groups producing conflicting evidence. Besides a few established factors such as body mass index, the use of electrocautery for dissection, early drain removal, low vacuum drains, obliteration of dead space, and delayed shoulder physiotherapy, most of the hypothesized causes have not been demonstrated consistently. Thus, seroma remains a threat to both the patient and surgeon. Recurrent transcutaneous aspiration remains the only successful management.
Desai Yuti,Srivastava Rajiv Ranjan,Srivastava Vijay Kumar,Kaushik Geetanjali,Singh Vinay Kumar 한국자원공학회 2023 Geosystem engineering Vol.26 No.5
The global generation of 2.2 billion tons of municipal solid waste (MSW) as a result of population growth, rapid urbanization, and industrial development has highlighted an urgent need for MSW management. Incineration is widely accepted as one alternative to landfilling; however, the recovery of heavy metals from the incinerated fly ash (IFA) before its final disposal is highly desirable to make the process sustainable. In this study, we studied the recovery of zinc and lead from typical MSW-IFA employing hydrometallurgical techniques. Sulfuric acid leaching was performed to selectively leach out zinc over the lead at the optimal condition of H2SO4 concentration = 1.5 M, temperature = 30°C, S/L ratio = 150 g/L, time = 2 h, and stirring speed = 300 rpm. The sulfate leach liquor was treated with a 5% stoichiometric excess of oxalic acid to precipitate>99% of zinc to be recovered as ZnC2O4·2 H2O. Further, the remaining lead in leach residue was subsequently leached in 50 g/L NaCl solution for 2 h yielded>94% efficiency. The dissolved lead was crystallized to recover the crystals of PbCl2. The demonstrated process leads towards the recovery of critical metals from an alternative source of MSW-IFA.
Jagriti Patel,Sanskriti Mujumdar,Vijay Kumar Srivastava Techno-Press 2023 Advances in environmental research Vol.12 No.2
Pollution, climate change, and waste accumulation are only some of the new problems that have arisen because of the exponential population growth of the past few decades. As the global population expands, managing municipal solid trash becomes increasingly difficult. This is by far the most difficult obstacle for governments to overcome, especially in less developed nations. The improper open dumping of trash, which is causing mayhem across the country, has two immediate effects: it contaminates groundwater and surface water. Air pollution and the accumulation of greenhouse gases are both exacerbated by the release of methane and other harmful waste gases. Leachate from the landfill leaks underground and pollutes groundwater. In most cases, leachate moves into the groundwater zone and pollutes it after forming in association with precipitation that infiltrates via waste. This has far-reaching effects on people's health and disturbs the natural environment. This review article critically examines the current state of Solid Waste Management (SWM), addressing both the highlighted concerns and the government management solutions that have been put in place to address these issues. In addition, the constraints, and difficulties that India will face in the future in terms of solid waste management and the role of models for such a system are discussed.
Gupta Payal,Dube Shriya,Priyadarshini Payal,Singh Shanvi,R Anasuya Pravallika,Srivastava Vijay Lakshmi,Sengupta Abhishek,Narad Priyanka 한국미생물·생명공학회 2023 한국미생물·생명공학회지 Vol.51 No.3
Endometrium receptivity is a complex mechanism of intricate pathways that lead to the shift from the proliferative to the secretory phase. Our goal was to identify high-ranking differentially expressed genes and study the pathways associated with the phenomenon. Raw data were retrieved from six GEO datasets and 705 DEGs were identified through robust ranking aggregation after the integration of five datasets. 20 key genes were identified that were further re-validated in an additional dataset. Supporting evidence through the experimental references confirms them as major biomarkers of the shift from the proliferative to the secretory phase.