A convenient co-precipitation method to prepare high performance LiNi 0.5 Mn 1.5 O 4 cathode for lithium ion batteries

Abstract(#br)A convenient and fast strategy to construct multistage spherical LiNi 0.5 Mn 1.5 O 4 by coprecipitation and following gradient temperature calcination has been developed. Considering about the effect of reaction kinetics, ethanol and water were used as co-solvent to accelerate the crystallite nucleation and reduce the reaction time. The precursors could be obtained within an hour with ethanol/water proportion of 1:3. Due to the synergistic effect of nanoscale primary particles and assembled micro-spheres of hierarchical LiNi 0.5 Mn 1.5 O 4 product, the material showed high electrochemical properties as cathode for lithium ion batteries. The cathode delivered 141 mAh g −1 at 1 C and maintained 94.2% after 200 cycles. Even at 10 C, 114 mAh g −1 could be retained. Furthermore, the full cell with Li 4 Ti 5 O 12 delivered 132.4 mAh g −1 at 1 C and kept 92.4% retention after 200 cycles. And the product at 55 °C also exhibited 133.2 mAh g −1 at 1 C and kept 93.2% after 100 cycles

An Alternative to Current Therapies of Functional Dyspepsia: Self-Administrated Transcutaneous Electroacupuncture Improves Dyspeptic Symptoms

Functional dyspepsia is of high prevalence with little treatment options. The aim of this study was to develop a new treatment method using self-management transcutaneous electroacupuncture (TEA) for functional dyspepsia (FD). Twenty-eight patients with FD were enrolled and underwent a crossover clinical trial with 2-week TEA at ST36 and PC6 and 2-week sham-TEA at nonacupuncture sham-points. Questionnaires were used to assess symptoms of dyspepsia and quality of life. Physiological testing included gastric emptying and electrogastrography. It was found that (1) TEA but not sham-TEA significantly improved dyspeptic symptoms and 4 domains in quality of life; improvement was also noted in self-rated anxiety and depression scores; (2) gastric emptying was significantly and substantially increased with 2-week TEA but not sham-TEA; and (3) gastric accommodation was also improved with TEA but not sham-TEA, reflected as increased ingested nutrient volumes at the levels of satiety and maximum tolerance. These findings suggest a therapeutic potential of self-administrated TEA method for functional dyspepsia, possibly attributed to improvement in gastric motility

THz Backward-wave oscillators for plasma diagnostic in nuclear fusion

Summary form only given. The understanding of plasma turbulence in nuclear fusion is related to the availability of powerful THz sources and the possibility to map wider plasma regions. A novel approach to realize compact THz sources to be implemented in the plasma diagnostic at NSTX experiment (Princeton Plasma Physics Laboratory, USA) is reported.Two novel 0.346 THz Backward-Wave Oscillators (BWOs) have been designed and are presently in the fabrication phase. One BWO is based on the Double Staggered Grating (DSG) that supports a sheet electron beam to provide a high output power; the second BWO is based on the Double Corrugated Waveguide (DCW) that supports a cylindrical electron beam generated by a conventional Pierce gun. The performance of both the BWOs was computed by Particle-in-cells (PIC) simulations. The DSG-BWO provides about 1W of output power with a beam current of 10 mA and a beam voltage of 16.8 kV. The DCW-BWO provides 0.74W output power with 10 mA beam current and 13 kV beam voltage. The DSG and the DCW have been realized by state of the art prototype nano-CNC milling machine (DMG Mori-Seiki) that permits one to achieve performance, in term of cost and surface finishing, unavailable with any other technology. It is the first time that this technique is applied to structures above 0.3 THz. The high output power of both the BWOs demonstrates the importance of novel approaches in the emerging field of THz vacuum electron devices

Magnetic fusion energy plasma diagnostic needs novel THz BWOs

The development of collective scattering diagnostics is essential for understanding of the anomalous transport attributed to short scale length microturbulence which poses a threat to the development of nuclear fusion reactors. Signals in the sub-THz range (0.1 – 0.8 THz) with adequate power are required to probe the plasma. A joint international effort is therefore devoted to the design and realization of novel backward wave oscillators at 0.346 THz and above with output power in the 1 Watt range to replace the bulky, high maintenance optically pumped FIR lasers so far utilized for this plasma diagnostic

The Method of Subsuper Solutions for Weighted p(r)-Laplacian Equation Boundary Value Problems

This paper investigates the existence of solutions for weighted p(r)-Laplacian ordinary boundary value problems. Our method is based on Leray-Schauder degree. As an application, we give the existence of weak solutions for p(x)-Laplacian partial differential equations

The Method of Subsuper Solutions for Weighted <inline-formula> <graphic file="1029-242X-2008-621621-i1.gif"/></inline-formula>-Laplacian Equation Boundary Value Problems

Abstract This paper investigates the existence of solutions for weighted -Laplacian ordinary boundary value problems. Our method is based on Leray-Schauder degree. As an application, we give the existence of weak solutions for -Laplacian partial differential equations.</p

Existence of Solutions for a Class of Weighted <inline-formula> <graphic file="1029-242X-2008-791762-i1.gif"/></inline-formula>-Laplacian System Multipoint Boundary Value Problems

<p>Abstract</p> <p>This paper investigates the existence of solutions for weighted <inline-formula> <graphic file="1029-242X-2008-791762-i2.gif"/></inline-formula>-Laplacian system multipoint boundary value problems. When the nonlinearity term <inline-formula> <graphic file="1029-242X-2008-791762-i3.gif"/></inline-formula> satisfies sub-<inline-formula> <graphic file="1029-242X-2008-791762-i4.gif"/></inline-formula><inline-formula> <graphic file="1029-242X-2008-791762-i5.gif"/></inline-formula> growth condition or general growth condition, we give the existence of solutions via Leray-Schauder degree.</p

Existence of Solutions for a Class of Weighted p t -Laplacian System Multipoint Boundary Value Problems

This paper investigates the existence of solutions for weighted p t -Laplacian system multipoint boundary value problems. When the nonlinearity term f t, ·, · satisfies sub-p − −1 growth condition or general growth condition, we give the existence of solutions via Leray-Schauder degree