摘要：为提高稻壳中木聚糖的提取率,稻壳经3%的硫酸预处理后再用碱法进行木聚糖的提取,采用响应面法优化工艺条件,先对提取温度、NaOH浓度、固液比、提取时间4个因素进行单因素试验。根据单因素试验结果设计中心组合试验,以木聚糖提取率为考察指标,采用响应面分析法确定最优工艺参数。结果表明:提取温度69.8℃、NaOH浓度10.7%、固液比1∶13(m∶V)、提取时间5.1h。该条件下,木聚糖提取率可达76.57%。

摘要：在对保鲜方便米粉生产实践及工艺分析的基础上,对国内外食品机械设备进行对比选型,设计了一套适于生产出口欧盟等国,班产3万份保鲜方便米粉的生产线,并对保鲜方便米粉车间设计中出现的技术问题提出了有效的解决方案。

摘要：利用响应面法对酵母富硒的发酵条件进行优化。首先通过Plackett-Burman法分析出4个重要因素,然后经最陡爬坡试验及响应面法(RSM)中的Box-Behnken法设计优化试验,确定主要因素的最佳值,即接种量24.9%(V∶V)、Se添加量18.7mg/L、培养时间29.4h、装液量68.8mL/250mL三角瓶,此时,酵母生物量和硒含量分别达到12.8614,2.6593mg/g,与有关报道[1]相比分别增加了19.54%,5.99%。

摘要：以玉米浆作为重组大肠杆菌培养基的主要碳源和氮源,在单因素优化的基础上,选择玉米浆、MgSO4和微量元素3个因素对玉米浆培养基进行响应面设计,采用BoxBehnken试验设计和响应面分析法,确定基因工程菌最佳的玉米浆培养基配方。结果表明,最佳的玉米浆培养基配方为:玉米浆26g/L,MgSO42.1g/L,微量元素7mL/L。该条件下,重组大肠杆菌产海藻糖合成酶酶活达到120.5U/mL。试验证明了玉米浆作为重组大肠杆菌培养基唯一的碳源和氮源生产海藻糖合成酶的可行性。

摘要：为优化水晶砂梨果醋的酿造工艺参数,以固态发酵法为基础,酸度为评价指标,拟合多因子试验中4个因子与试验结果的关系,构建1个二次回归方程:Y=5.72333+0.27875X1+0.13792X2+0.14375X3-0.33625X4-0.15563X1X2+0.30187X1X3+0.15937X1X4-0.010625X2X3+0.27937X2X4-0.25063X3X4-0.29948X12-0.32823X22-0.33948X32-0.30948X42,R2=0.9531。在初始酒精度7.32%、醋酸菌接入量9.86%、温度31.72℃、发酵时间153.12 h条件下,酸度最高,即6.01%。验证试验的酸度为(6.16±0.08)%(N=3),说明该模型可靠。

摘要：介绍一种人体模型多通道电子语音解说系统的设计,该系统利用大规模语音合成芯片的特点,建立了多路语音通道的手动寻址方式,实现了各路语音通过寻址电路和语音芯片的同步复位,完成了多路通道的录制与再生,因而提高了模型在医学教学中的价值。

摘要：A broadband and ultra-thin absorber for solar cell application is designed. The absorber consists of three layers, and the difference is that the four split ring resonators made of metal gold are encrusted in the gallium arsenide （GaAs） plane in the top layer. The simulated results show that a perfect absorption in the region from 481.2 to 684.0THz can be obtained for either transverse electric or magnetic polarization wave due to the coupling effect between the material of GaAs and gold. The metamaterial is ultra-thin, having the total thickness of 56nm, which is less than one-tenth resonance wavelength, and the absorption coefficients at the three resonance wavelengths are above 90%. Moreover, the effective medium theory, electric field and surface current distributions are adopted to explain the physical mechanism of the absorption, and the permittivity sensing applications are also discussed. As a result, the proposed structure can be used in many areas, such as solar cell, sensors, and integrated photodetectors.

摘要：我们设计制作了一套简便、安全而适用的实验装置，对医学生日后分析人体中所含微量元素及诊断大有帮助，现报告如下。