“Words lie in our way”

The central claim of computationalism is generally taken to be that the brain is a computer, and that any computer implementing the appropriate program would ipso facto have a mind. In this paper I argue for the following propositions: (1) The central claim of computationalism is not about computers, a concept too imprecise for a scientific claim of this sort, but is about physical calculi (instantiated discrete formal systems). (2) In matters of formality, interpretability, and so forth, analog computation and digital computation are not essentially different, and so arguments such as Searle's hold or not as well for one as for the other. (3) Whether or not a biological system (such as the brain) is computational is a scientific matter of fact. (4) A substantive scientific question for cognitive science is whether cognition is better modeled by discrete representations or by continuous representations. (5) Cognitive science and AI need a theoretical construct that is the continuous analog of a calculus. The discussion of these propositions will illuminate several terminology traps, in which it's all too easy to become ensnared.     

A Study on Residential Clothes Drying Using Waste Heat Rejected from a Split-Type Room Air Conditioner (RAC)

This article reports on a study of developing a novel residential clothes dryer using waste heat rejected from a room air conditioner. An experimental rig has been set up and extensive experimental work under various operating conditions carried out. A simplified mathematical expression (SME) for the clothes drying process using rejected waste heat from a RAC has also been developed and validated by the experimental results. The study results showed that in tropical or sub-tropical regions, where air conditioning is operated for at least 7-8 months in a year, the use of waster heat from an air cooled RAC can achieve both effective clothes drying and energy use reduction.     

Temperature dependent optical properties of single, hierarchically self-assembled GaAs/AlGaAs quantum dots

We report on the experimental observation of bright photoluminescence emission at room temperature from single unstrained GaAs quantum dots (QDs). The linewidth of a single-QD ground-state emission (≈ 8.5 meV) is comparable to the ensemble inhomogeneous broadening (≈ 12.4 meV). At low temperature (T  ≤  40 K) photon correlation measurements under continuous wave excitation show nearly perfect single-photon emission from a single GaAs QD and reveal the single photon nature of the emitted light up to 77 K. The QD emission energies, homogeneous linewidths and the thermally activated behavior as a function of temperature are discussed.     

用PAT研究两种硅橡胶的大分子结构特征

用未硫化的甲基乙烯基硅橡胶和接枝室温硫化硅橡胶作正电子湮没实验的结果表明，甲基乙烯基硅橡胶的τ１，τ２均较ＲＴＶ的短，而τ３较长。对这一现象作了定性的解释。     

机房系统维护两种方法

介绍机房计算机系统的恢复和重装两种方法。     

Structural and catalytic properties of Ti–MCM-41 synthesised at room temperature up to high Ti content

A study of the pore structural properties and catalytic activity of MCM-41 containing titanium, prepared by direct synthesis at ambient temperature and pressure, using tetraethoxysilane, titanium alcoxides, cationic surfactants and ammonia is presented. The influence of different metal sources (titanium ethoxide, isopropoxide or n-butoxide), alcohols (ethanol or propan-2-ol), metal content (2  Si/Ti  100) and surfactants (tetra-, hexa- or octadecyltrimethylammonium bromide) is considered. The materials were characterised by X-ray diffraction, nitrogen adsorption at 77 K and diffuse reflectance UV–Vis spectroscopy. The catalytic activity was evaluated in the model reaction of oxidation of cyclohexene with anhydrous tert-butylhydroperoxide, for representative samples. It is concluded that this method allows the preparation in a short period of time of well structured and catalytically active Ti–MCM-41. Down to Si/Ti = 10 the materials have high pore volumes and very uniform pore size, with highest conversion and excellent selectivity demonstrated in the compositional range 30  Si/Ti  100, corresponding to materials containing predominantly isolated and tetracoordinated Ti. The increase in Ti content to Si/Ti ratios of 10 and 5 implied a reduction both in conversion and selectivity, although the MCM-41 structure was still observed for Si/Ti = 2.     

Characterization of Radon Decay Products in a Domestic Environment

Field measurements of the concentration and activity size distribution of radon decay products were conducted in a one-story house located in the Princeton, NJ area. Radon concentration and particle number concentration were also measured. The concentration and activity-weighted size distribution of radon decay products were determined using a microcomputer-controlled, semi-continuous screen diffusion battery system with 6 parallel sampler/detector units. A condensation nuclei counter was used for the measurements of indoor panicle number concentration. Several measurements were made in the living room as well as more than one hundred measurements in the master bedroom of the Princeton house. Aerosols were generated from taking a shower, burning a candle, smoldering a cigarette, vacuuming, and cooking. Therefore, the influence of various indoor panicle sources on the behavior of radon decay products was investigated. With panicles generated from typical household activities, Potential Alpha Energy Concentration (PAEC) increases and the unattached fraction decreases. Larger panicles generated from cigarette smoke and cooking dramatically shifted most of the radon decay products into the attached mode (15-500 nm). With regard to the higher attachment rate, the size distributions of radon decay products remained stable for long periods of time after particle generation. On the other hand, aerosols produced from candle burning and vacuuming were much smaller, with an average attachment diameter of 15 nm. These panicles did decrease the unattached fraction, especially during the aerosol generation period. However, the size distributions of radon decay products returned to the background condition within ISO minutes after the end of particle generation. In these cases, the panicles had a higher deposition rate and a lower attachment rate. The dose of alpha radiation per unit radon concentration resulting from each of these aerosol conditions was calculated using the measured activity size distributions and the most recent James dosimetric model. These doses to basal cells at a breathing rate of 0.45 m³ hr¹ ranged from 3 to 14 μGy Bq^?1 hr while the dose to secretory cells at a breathing rate of 1.5 m³ hr¹ ranged from 13 to 77 μGy Bq^?1 hr for the various aerosol conditions.     

智能热交换器与空调系统构建的“绿色基站”解决方案与实践

在分析基站耗电的主要构成、机房内外气温变化统计情况的基础上,介绍"绿色基站"节能散热解决方案的架构和实践情况。应用情况表明,该解决方案可在保证机房环境温湿度、洁净度等要求的同时,充分利用自然冷源,大幅降低基站空调耗电,给通信企业带来显著的经济和社会效益。     

孕产妇居室布置

居室对孕产妇健康和孩子发育有着重要的作用,本文以孕产妇身心需要为原则。详细分析了孕产妇各个阶段的身心特征和对居室的要求,归纳总结了孕产妇居室布置的方法。     

管翅式全铝换热器在家用空调上的应用研究

本文对家用空调器换热器采用管翅式全铝换热器的材料选择、试验分析、焊接工艺等进行了研究和分析,提出了管翅式全铝换热器在家用空调器上的应用可行性。