专家言论：鼠不尽的Q&As，鼠不尽的收获!

Q1:我非常喜爱《caraudio》杂志!你们太棒了!,听君一席话如拨云雾见青天,你们的解答总能让我们豁然开朗。我很好奇:低音的安装条件究竟是怎样的?但如果低音炮是一个必需的玩艺,为什么不是每辆车都安装它呢?谢谢!——Ryan Sippel Otsego,WI     

Thermal conductivity mapping of oxidized SiC/SiC composites by time-domain thermoreflectance with heterodyne detection

Silicon carbide/silicon carbide (SiC/SiC) composites are often used in oxidizing environments at high temperatures. Measurements of the thermal conductance of the oxide layer provide a way to better understand the oxidation process with high spatial resolution. We use time-domain thermoreflectance (TDTR) to map the thermal conductance of the oxide layer and the thermal conductivity of the SiC/SiC composite with a spatial resolution of 3 μm. Heterodyne detection using a 50-kHz-modulated probe beam and a 10-MHz-modulated pump suppresses the coherent pick-up and enables faster data acquisition than what has previously been possible using sequential demodulation. By analyzing the noise of the measured signals, we find that in the limit of small integration time constants or low laser powers, the dominant source of noise is the input noise of the preamplifier. The thermal conductance of the oxide that forms on the fiber region is lower than the oxide on the matrix due to small differences in thickness and thermal conductivity.     

Design of a functional box for take‐away pizza

Pizza is one of the world‐famous Italian dishes because of its simplicity, taste, nutritional value and low cost. It is usually consumed at specialized vending points, which also offer a take‐away service. The packaging must guarantee adequate protection against rapid temperature decrease and water vapour elimination, to maintain quality. In this paper the performance of a traditional corrugated cardboard container is compared with that of a new package, realized with expanded polystyrene and a water‐absorbing polymer. The tests performed (water absorption, WVTR, thermal insulation and sensory profile) showed that the new packaging was better than the traditional one. The ‘consumption life’ of take‐away pizza was increased, allowing the product to reach consumers nearly in the same condition in which it left the oven: warm and not softened. Copyright © 1999 John Wiley & Sons, Ltd.     

Citrate Starch — Application as Resistant Starch in Different Food Systems

Chemically modified starch was used as resistant starch (RS) to enhance the dietary fibre content in foods. Citrate starch was produced by esterification of starches of various origins and added to toast bread, wafers, pasta and extruded products. The RS content as well as relevant product features were determined and results compared to those of products without any citrate starch addition. The results show that the RS content in toast bread could be increased by approximately 3%, when 7.5% citrate starch was added, compared to non-fortified bread. Changes in product features due to addition of citrate starch could be compensated for by variation in the recipe, such as increasing the amount of water. Thus, appealing products could be obtained with an enriched dietary fibre content. The extend of the RS enhancement depends highly on the food system chosen.     

Direct Enzymatic Synthesis of a Deep-Blue Fluorescent Noncanonical Amino Acid from Azulene and Serine

We report a simple, one-step enzymatic synthesis of the blue fluorescent noncanonical amino acid β-(1-azulenyl)-l -alanine (AzAla). By using an engineered tryptophan synthase β-subunit (TrpB), stereochemically pure AzAla can be synthesized at scale starting from commercially available azulene and l -serine. Mutation of a universally conserved catalytic glutamate in the active site to glycine has only a modest effect on native activity with indole but abolishes activity on azulene, suggesting that this glutamate activates azulene for nucleophilic attack by stabilization of the aromatic ion.     

呼风唤雨

圣迭戈充电器经销商Kassim Osgood拥有一辆2002年产的Cadillac(凯迪拉克) Escalade。其车身印有一小段《圣经·诗篇》:The Lord is my Light and my Salvation.Whom Shall I Fear?(中文翻译:耶和华是我的亮光,是我的拯救!我还怕谁呢?)每天,这辆250多磅重的家伙都在你眼前晃来晃去,自然而然,你就会形成     

德国制造，美国改装

当对汽车施展拳脚准备大干一场时,有些车主朋友比汽车更经受不起折腾。对于Hi-Velocity Motorsports(HVM)的Don Whitmire来说,各式各样的高档车或者SEMA车展的展示样车已经是司空见惯了,然而。他对梅赛德斯一奔驰S600仍赞赏有加。我们的老朋友——汽车改装迷Dennis Scalpi就拥有一辆梅赛德斯-奔驰S600,它是一款高性能的新车型。Dennis Scalpi要求HVM对他的爱车进行音响改装并非一时心血来潮,Whitmire对此也心知肚明。值得一提的是,梅赛德斯-奔驰S600装备了双涡轮增压的顶级v12发动机。排量为5.51,最大功率为368kw     

牛改

对于许多国家的普通中产阶级而言,把钱大把大把地砸在改装车上.有点荒唐且不可思议。既便是林宝坚尼(Lambo)、保时捷(Porsche)、玛莎拉蒂(Maserati).或是其他高端车的改装.我们在欣赏它的原装设计的同时,都期望它的改装意念不要过火。车主与改装技师的深入沟通才可以产生经典牛改。     

宝马635csi改装(续集)

我们继续改装宝马635csi(雅称Bavarian Baller)的内饰。这次,我们要改装汽车前座椅和后座椅的内饰。尽量保持宝马635csi的原车面貌,但我们也要融入一些改装的元素。问题的关键就是努力寻求到两     

Humor and anxiety.

Psychoanalytic literature, recognizing a relationship between humor and anxiety and emphasizing the aggressive and sexual, as well as the nonsensical, aspects of humor, led to the experimental question whether Ss differentiated on the basis of a self-rated anxiety scale respond differently to humorous stimuli. Based upon a general anxiety questionnaire, extreme groups of 28 high anxiety and 28 low anxiety Ss containing equal numbers of men and women were selected. Cartoons selected from the Mirth Response Test were presented to each S one at a time in a standardized order that intermingled the various content categories of aggression, sex, and nonsense. There was a relationship found between S's rating of his susceptibility to anxiety and his preference for cartoons of aggressive content, and this relationship was seen to depend upon the social context of the humor stimuli. To a lesser extent there was also a relationship between anxiety, preference, and social context in the case of nonsensical cartoons. (PsycINFO Database Record (c) 2010 APA, all rights reserved)