DS/CDMA通信系统盲差分自适应接收器

针对标准MMSE自适应接收器在频率非选择性衰落信道中的相位滑动和失锁问题，提出了一种无需进行训练和信道参数估计的盲差分自适应接收器，为自适应地实现该接收器，同时提出了一种基于正交分解的盲平均随机梯度（Orthogonal Decomposition-based Blind Averaged stochastic Gradient,ODBAG)算法，仿真结果，这种以ODBAG算法实现的盲差分自适应接收器的瑞利（Rayleigh)衰落信道中，误码率性能比传统匹配滤波器（Matched Filter,MF)接收器有显著的提高，并接近改进的MMSE自适应接收器的性能。     

Supramolecular assemblies based on 2-ureido-4[1H]-pyrimidinone building block

Supramolecular systems are broadly defined as multi-component molecular assemblies, in which the components are held together by a variety of weaker non-covalent interactions, such as hydrogen bonding, π-π stacking,and hydrophobic and lipophilic interac…     

军队服装订货和供应系统的计算机仿真

美军服装订货和供应系统采用传统的经济订货量法和分发中心供货。由于生产厂不能预测订货周期和数量，很难计划生产；而维护分发中心也增加了开销。讨论了现行系统模型，并提出一个新的系统方案。新方案采用正常，的固定的订货量，不但直接有利于生产厂安排生产，产能减少库存。     

Population bases and the 2011 Census

In an increasingly complex society there are a number of different population definitions that can be relevant for users, beyond the standard definition used in counting the population. This article describes the enumeration base for the 2011 Census and how alternative population outputs may be produced. It provides a background as to how the questions on the questionnaire were decided upon and how population bases can be constructed from the Census. Similarities and differences between the information collected across the three UK Censuses (England and Wales, Scotland and Northern Ireland) are discussed. Finally, issues around estimating the population on alternative bases are presented.     

Di-electrophoresis assembly and fabrication of SWCNT field-effect transistor

In the process of fabricating nano electrical device or system based on single-walled carbon nanotube （SWCNT）, the controllable assembly and fabrication of SWCNT field-effect transistor （SWCNT FET） is a key issue. SWCNT FET is the most basic and important component in nano electronics. After microelectrode chip of back-gate FET is designed and fabricated, di-electrophoresis technology is adopted to realize the controllable alignment and assembly of SWCNTs, based on dispersing SWCNT by sodium dodecyl sulphate （SDS） facilitated ultra-sonication technique and removing impurities by centrifugal technique. The experiments of SWCNTs assembly demonstrate that SWCNTs are aligned and assembled uniformly at the microelectrodes gap with the alignment density nearly proportional to di-electrophoresis duration and solution concentration. After the processes of rinsing, drying and improving, metallic SWCNTs among the assembled SWCNTs are burned out and residual SDS is removed, and perfect field-effect performance of SWCNT FET is eventually obtained.     

Dynein mutations impair autophagic clearance of aggregate-prone proteins

Mutations that affect the dynein motor machinery are sufficient to cause motor neuron disease. It is not known why there are aggregates or inclusions in affected tissues in mice with such mutations and in most forms of human motor neuron disease. Here we identify a new mechanism of inclusion formation by showing that decreased dynein function impairs autophagic clearance of aggregate-prone proteins. We show that mutations of the dynein machinery enhanced the toxicity of the mutation that causes Huntington disease in fly and mouse models. Furthermore, loss of dynein function resulted in premature aggregate formation by mutant huntingtin and increased levels of the autophagosome marker LC3-II in both cell culture and mouse models, compatible with impaired autophagosome-lysosome fusion.     

Indication of drier periods on Mars from the chemistry and mineralogy of atmospheric dust

The ubiquitous atmospheric dust on Mars is well mixed by periodic global dust storms, and such dust carries information about the environment in which it once formed and hence about the history of water on Mars. The Mars Exploration Rovers have permanent magnets to collect atmospheric dust for investigation by instruments on the rovers. Here we report results from M?ssbauer spectroscopy and X-ray fluorescence of dust particles captured from the martian atmosphere by the magnets. The dust on the magnets contains magnetite and olivine; this indicates a basaltic origin of the dust and shows that magnetite, not maghemite, is the mineral mainly responsible for the magnetic properties of the dust. Furthermore, the dust on the magnets contains some ferric oxides, probably including nanocrystalline phases, so some alteration or oxidation of the basaltic dust seems to have occurred. The presence of olivine indicates that liquid water did not play a dominant role in the processes that formed the atmospheric dust.     

Circadian rhythms from flies to human

In this era of jet travel, our body 'remembers' the previous time zone, such that when we travel, our sleep wake pattern, mental alertness, eating habits and many other physiological processes temporarily suffer the consequences of time displacement until we adjust to the new time zone. Although the existence of a circadian clock in humans had been postulated for decades, an understanding of the molecular mechanisms has required the full complement of research tools. To gain the initial insights into circadian mechanisms, researchers turned to genetically tractable model organisms such as Drosophila.