The Asian Conference on Psychology and the Behavioral Sciences 2015

Conference Note

High quality Fe3-deltaO4/InAs hybrid structure for electrical spin injection

Single Crystalline Fe3-deltaO4 (0<=delta<=0.33) films have been epitaxially grown on InAs (001) substrates by molecular beam epitaxy using O2 as source of active oxygen. Under optimum growth conditions in-situ real time reflection high-energy electron diffraction patterns along with ex-situ atomic force microscopy indicated the (001) Fe3-deltaO4 to be grown under step-flow-growth mode with a characteristic surface reconstruction. X-ray photoelectron spectroscopy demonstrate the possibility to obtain iron oxides with compositions ranging from Fe3O4 to gamma-Fe2O3. Superconducting quantum interference device magnetometer at 300K shows well behaved magnetic properties giving therefore credibility to the promise of iron based oxides for spintronic applications.Comment: 3 pages, 4 figures appeared in Virtual Journal of Nanoscale Science and Technology, Vol:15, issue12, March 26, 200

Phase diagram of the 1/3-filled extended Hubbard model on the Kagome lattice

We study the phase diagram of the extended Hubbard model on the kagome lattice at 1/3 filling. By combining a configuration interaction approach to an unrestricted Hartree-Fock, we construct an effective hamiltonian which takes the correlations back on top of the mean-field solution. We obtain a rich phase diagram with, in particular, the presence of two original phases. The first one consists of polarized droplets of metal standing on the hexagons of the lattice, and an enlarged kagome charge order, inversely polarized, on the remaining sites. The second, obeying a local ice-rule type constraint on the triangles of the kagome lattice, is driven by an antiferromagnetically coupling of spins and is constituted of disconnected 6-spin singlet rings. The nature and stability of these phases at large interactions is studied via variational wave functions and perturbation theory.Comment: 6 pages, 5 figure

A high power handling capability CMOS T/R switch for x-band phased array antenna systems

This paper presents a single-pole double-throw (SPDT) transmit/receive (T/R) switch fabricated in 0.25-μm SiGe BiCMOS process for X-Band (8 – 12 GHz) phased array radar applications. The switch is based on series-shunt topology with combination of techniques to improve insertion loss (IL), isolation and power handling capability (P1dB). These techniques include optimization of transistor widths for lower insertion loss and parallel resonance technique to improve isolation. In addition, DC biasing of input and output ports, on-chip impedance transformation networks (ITN) and resistive body-floating are used to improve P1dB of the switch. All these design techniques resulted in a measured IL of 3.6 dB, isolation of 30.8 dB and P1dB of 28.2 dBm at 10 GHz. The return losses at both input and output ports are better than 16 dB from 8 to 12 GHz. To our knowledge, this work presents the highest P1dB at X-Band compared to other reported single-ended CMOS T/R switches in the literature

Measuring Baseball’s Heartbeat: The Hidden Harms of Wearable Technology to Professional Ballplayers

Föreliggande examensarbete undersöker möjligheterna att effektivisera order- och lagerhanteringen av surfplattor hos företaget Företag A. Arbetet är avgränsat till företagets varuhus i Barkarby och till de två största märkena på marknaden just nu; Apple och Samsung. Detta är ett ämne som är relativt nytt eftersom det är en relativt ny marknad runt hela världen som har exploderat sedan Apples första lansering av surfplattan. Eftersom Företag A säljer samtliga märkens surfplattor vilka har helt olika efterfrågan, så kan deras order- och lagerhantering bli svårhanterlig. De uppställda frågeställningarna som ligger till grund för arbetet är: Vilken/vilka teoretiska modeller om orderhantering kan bäst tillämpas på fallet Företag A Barkarby? Vilka åtgärder skulle kunna genomföras för att effektivisera det nuvarande arbetssättet? Utifrån dessa frågor har en del modeller undersöks huruvida de passar in i både teori och praktik på Företag As sätt att hantera de mest sålda surfplattorna på sitt lager. Genom att studera deras arbetssätt när det gäller ordrar och förvaring på lagret kan sedan passande modeller appliceras. Fallstudien har till stor del genomförts genom att utifrån studielitteratur diskutera ämnet med personal från Företag A; både från huvudkontoret och från Barkarbyvaruhuset.Resultatet från uppsatsen är att det inte finns någon befintlig modell som passar in till 100% på Företag As arbetssätt, däremot finns det andra faktorer som kan ändras på för att få en mer kontinuerlig och överseende orderhantering. Marknaden för surfplattor är otroligt oförutsägbar och fluktuerar ofta utan något utstuderat mönster. Det enda som har visat sig vara säkert är åtgången av de två mest populära märkena när de släpper en ny modell.Marknaden för elektronikkedjor är otroligt konkurrensstyrd, inte bara i Sverige utan i hela Europa, vilket gör det än viktigare att ha rätt kvantitet på lager. Finns inte det kunderna vill ha så går de någon annanstans, eftersom priserna på surfplattor är densamma överallt.This paper examines the possibilities to make the handling of orders and storage for tablets more efficient for Företag As warehouse in Barkarby. The work is limited to the company’s warehouse in Barkarby and to the two largest manufacturers for tablets; Apple and Samsung. This is a relatively new subject because it is a relatively new market around the world, which has exploded since Apple released their first tablet. Because Företag A sells every manufacturer’s tablet, all with different demands, it makes the organisation of orders and storage quite difficult.The formulated questions which this paper is based on are: Which of the theoretical models about orderhandeling can best be applied on the case of Företag A Barkarby? What measures can be used to make the current way of working more efficient? With these questions as a starting point some models have been studied whether they fit in theory and practice in the way Företag A works when it comes to handling the most sold tablets in their storage. Through studying their way of working suiting models can be applied. The case study has mainly been implemented by after reading student literature discussing the problems with people who works at Företag A; both at the head quarters and in the warehouse in Barkarby.The result from this essay is that there isn’t any model which fits 100 % on Företag A’s way of work, but there are other factors that can be changed to get a more continuous and overseeing order process. The market for tablets is very unpredictable and fluctuates often without a worked out pattern. The only sure thing is the demand with the two most popular manufacturers when they release a new model.The market for electronic chains is extremely competition controlled, not only in Sweden but in all of Europe, which makes it even more important to have the right quantity in storage. If the product that the customers want isn’t available they simply go somewhere else, since the prices are the same everywhere

A new resonant circuit for 2.45 GHz LC VCO with linear frequency tuning

A new MOS varactor bank is proposed to implement a 2.45 GHz SiGe BiCMOS LC-tank voltage controlled oscillator (VCO) with linear frequency tuning. Compared to a conventional VCO, the proposed technique improves the quality factor of the LC-tank while preserving the linearity of the circuit. Realized in 0.25-μm SiGe BiCMOS technology, VCO exhibits 35% VCO gain (KVCO) variation from 2.29 to 2.66 GHz with a 16% tuning ratio. The VCO also exhibits a phase noise of -113 dBc/Hz at 1 MHz offset frequency and consumes 1.7 mA from 1.8 V supply