We describe a modiication of the Hu{Tucker algorithm for constructing an optimal alphabetic tree that runs in O(n) time for several classes of inputs. These classes can be described in simple terms and can be detected in linear time. We also give simple conditions and a linear algorithm for determining, in some cases, if two adjacent nodes will be combined in the optimal alphabetic tree.

This article presents the segmentation of brain tumors in MRI images by using optimal morphology thresholding methods. The number patients with diseases is increased. Therefore, needs for are Accordingly, accurate and quick identification methods really necessary. These also include planning diagnosis tools automatic images. new that can automatically solve problems diagnose diseases. consist R...

Nanostructured Ni1-xLnxSb2O6 (Ln = Eu, Gd, Ho and Yb) powders were synthesized via stoichiometric 1:2 Ni:Sb molar ratio by solid state reaction at 800 ºC for 8 h using Ni(NO3)2, Sb2O3, Eu2O3, Gd2O3 and Ho2O3 raw materials. The synthesized materials were characterized by X-ray diffraction (XRD) technique. Structural analyses were done by FullProf program employing profile matching with constant ...

A new method to prepare composite nanofiltration membrane directly and efficiently by controlling the pore structure surface morphology of is proposed in this paper. The fabrication mesoporous silicon modified polysulfone blend membranes via a phase inversion method. structural morphology, functional group analysis, elemental hydrophilicity, chargeability, nitrogen pollutant (ammonia nitrogen, ...

Nanocomposite of polyaniline (PAn) containing nanometre size Sb2O3 was prepared in aqueous media in situ chemical oxidative polymerization method at room temperature in the presence of hydroxypropylcellulose (HPC) as a surfactant. The ability of product to removal of lead ions from aqueous solution was studied. The chemical structure and morphology were studied by fourier transform infrared (FT...

A hydrophilic macromolecular network is prepared by performing graft copolymerization of poly (sodium acrylate) chains onto salep and silica gel. The reaction parameters affecting the water absorbency of the superabsorbent composite were optimized using Taguchi method. FT-IR spectroscopy and Thermo Gravimetric Analysis (TGA) were used for confirming the s...

The Ni-W/PTFE co-depositions were successfully prepared on steel via pulse electrodeposition methods. Electrodeposition was perform by dispersing 5-20 g/L PTFE particles from Ni-Watt bath. surface morphology, phase analyses crstalytallite size, distorsion and hardness of the samples characterized SEM, XRD, Vicker?s microhardness tester. friction coefficient coatings carried out using CSM microt...

When a firm starts a new monthly customer account, they typically will bill new customers one month from the start of the new account. However, if they have the opportunity to choose the date of the first bill, this results in missing an opportunity for additional profit. This paper calculates the initial billing period that maximizes the net present value to the firm, and calculates the net ga...

Inheritances create a second distinguishing characteristic of individuals, in addition to earning abilities. We incorporate this fact into an optimum income taxation model with bequests motivated by joy of giving, and show that a tax on inherited wealth is equivalent to a tax on expenditures, i. e. to a uniform tax on consumption plus bequests. These taxes have a positive effect on intertempora...

The recently studied planar-doped triangular barrier structure is analyzed theoretically for a possible application as a barrier injection transit time device (BARMT). The small signal impedance as well as the large-signal power characteristics are calculated. Compared to the conventional Bm structures the new device offers a sign&ant improvement in its frequency range and generated power. The ...