Quasi-antiferromagnetic multilayer stacks with 90 degree coupling mediated by thin Fe oxide spacers

We fabricated quasiantiferromagnetic (quasi-AFM) layers with alternating antiparallel magnetization in the neighboring domains via 90 degrees magnetic coupling through an fe-o layer. we investigated the magnetic properties and the relationship between the magnetic domain size and the 90 degrees magnetic coupling via experiments and calculations. two types of samples with a ru buffer and a (ni80fe20)cr-40 buffer were prepared, and we found that with the nifecr buffer, the sample has a flatter fe-o layer, leading to stronger 90 degrees magnetic coupling and a smaller domain size compared with the ru buffer sample. this trend is well explained by the bilinear and biquadratic coupling coefficients, a(12) and b-12, in landau-lifshitz-gilbert simulations, suggesting the possibility of using both afm and fm properties by controlling the quasi-afm domain size

Infrastructure for Detector Research and Development towards the International Linear Collider

The EUDET-project was launched to create an infrastructure for developing and testing new and advanced detector technologies to be used at a future linear collider. The aim was to make possible experimentation and analysis of data for institutes, which otherwise could not be realized due to lack of resources. The infrastructure comprised an analysis and software network, and instrumentation infrastructures for tracking detectors as well as for calorimetry.Comment: 54 pages, 48 picture

Topological insights in polynuclear Ni/Na coordination clusters derived from a schiff base ligand

This article presents the syntheses, crystal structures, topological features and magnetic properties of two NiII/NaI coordination clusters (CCs) formulated [NiII3Na(L1)3(HL1 (MeOH)2] (1) and [NiII6Na(L1)5(CO3)(MeO (MeOH)3(H2O)3]·4(MeOH) 2(H2O) [2 4(MeOH) 2(H2O)] where H2L1 is the semi rigid Schiff base ligand (E)-2-(2-hydroxy-3 methoxybenzylideneamino)-phenol). Compound 1 possesses a rare NiII3NaI cubane (3M4-1) topology and compound 2 is the first example in polynuclear Ni/Na chemistry that exhibits a 2,3,4M7-1 topology

Research and Design of a Routing Protocol in Large-Scale Wireless Sensor Networks

无线传感器网络，作为全球未来十大技术之一，集成了传感器技术、嵌入式计算技术、分布式信息处理和自组织网技术，可实时感知、采集、处理、传输网络分布区域内的各种信息数据，在军事国防、生物医疗、环境监测、抢险救灾、防恐反恐、危险区域远程控制等领域具有十分广阔的应用前景。 本文研究分析了无线传感器网络的已有路由协议，并针对大规模的无线传感器网络设计了一种树状路由协议，它根据节点地址信息来形成路由，从而简化了复杂繁冗的路由表查找和维护，节省了不必要的开销，提高了路由效率，实现了快速有效的数据传输。 为支持此路由协议本文提出了一种自适应动态地址分配算——ADAR（AdaptiveDynamicAddre...As one of the ten high technologies in the future, wireless sensor network, which is the integration of micro-sensors, embedded computing, modern network and Ad Hoc technologies, can apperceive, collect, process and transmit various information data within the region. It can be used in military defense, biomedical, environmental monitoring, disaster relief, counter-terrorism, remote control of haz...学位：工学硕士院系专业：信息科学与技术学院通信工程系_通信与信息系统学号：2332007115216

Operation of a GEM-TPC with pixel readout

A prototype time projection chamber with 26 cm drift length was operated with a short-spaced triple gas electron multiplier (GEM) stack in a setup triggering on cosmic muon tracks. A small part of the anode plane is read out with a CMOS pixel application-specified integrated circuit (ASIC) named Timepix, which provides ultimate readout granularity. Pixel clusters of charge depositions corresponding to single primary electrons are observed and analyzed to reconstruct charged particle tracks. A dataset of several weeks of cosmic ray data is analyzed. The number of clusters per track length is well described by simulation. The obtained single point resolution approaches 50 m at short drift distances and is well reproduced by a simple model of single-electron diffusion

Development of charged particle detectors by integrating gas amplification stages and CMOS ASICs on wafer level

Gaseous detectors with a highly pixelized readout have demonstrated good capabilities of tracking high energetic particles. In particular, using post-processing methods to integrate the gas amplification stage on top of pixel readout chips has proven to detect single electrons with a very high efficiency and accuracy. So far, these detectors called InGrids or GEMGrids have been produced in a chip based process at the University of Twente. A new wafer based production process has been set up. A first test sample has been produced and tested. Signals from a as well as from a source could be observed

Adsorptive separation of C2/C3/C4-hydrocarbons on a flexible Cu-MOF: The influence of temperature, chain length and bonding character

In this work, manometrically and gravimetrically measured adsorption isotherms on the flexible copper MOF material Cu-4(mu(4)-O)(mu(2)-OH)(2)(Me(2)trzpba)(4) (1) are presented and discussed. This includes nitrogen (N-2) adsorption at 77.3 K, carbon dioxide (CO2) adsorption at 298.15 K (Supplementary Material) and the adsorption of the five hydrocarbons ethane, ethene, propane, n-butane and 1-butene at 273.15 K, 298.15 K and 323.15 K. Up to the saturation pressure, all isotherms show distinct inflection characteristics, that are relatable to structural transitions of the flexible solid. The number of inflections and the relative pressure at which the inflections manifest depend on the characteristics of the relevant adsorptive and on temperature. For the hydrocarbon adsorption isotherms, we studied the influence of i) measurement temperature, ii) bonding character, and iii) the chain length of the alkanes and alkenes. In addition, the origin of decreasing equilibrium pressure with increasing adsorbed volume in the nitrogen adsorption isotherms on the flexible MOF material 1 is discussed. Calculations using the Ideal Adsorbed Solution Theory (LAST), based on the unary isotherm fits, along with transient breakthrough simulations, are used to demonstrate that Cu-MOF 1 has the potential to separate 5-component ethane/ethene/propane/n-butane/1-butene mixtures to yield three different fractions with increasing carbon numbers. (C) 2016 Elsevier Inc. All rights reserved