摘要：为了研究豇豆干燥特性以缩短干燥时间,该文利用隧道式热风干燥技术探讨了不同干燥风温(60、70和80℃)、风速(0.3、0.4和0.5m/s)和料层厚度(6、18和30mm)对豇豆干燥特性的影响。结果表明:豇豆的隧道式热风干燥前期主要是增速干燥阶段,后期主要是降速干燥阶段。提高干燥风温和风速,较少料层厚度均可缩短干燥时间。豇豆的水分有效扩散系数随着干燥风温和风速的升高而增大,随着料层厚度的增加而降低。通过阿伦尼乌斯公式计算出豇豆的干燥活化能为33.9kJ/mol。使用决定系数R2、均方根误差RMSE和误差平方和SSE对7种常用干燥模型进行评价,结果表明:Page模型的平均R2值最大、平均RMSE值和SSE值最小,分别为0.9988、0.01105和0.00286,是描述豇豆隧道式热风干燥的最优模型。研究结果可以为工程实践中预测豇豆隧道式干燥过程的水分变化提供参考。

摘要：隧道烘干窑内同一横截面的热风均匀性影响着物料干燥均匀性和产品质量,而烘干窑入口风速分布直接影响着窑内热风流场的均匀分布。为了解决单一风机直进风隧道烘干窑存在的风速不均匀问题,提出了多种进风结构设想,并利用计算流体力学方法对实际生产的隧道窑进风流场进行数值模拟,研究3种不同的进风方案(4风机、6风机和9风机)对隧道窑内热风流场均匀性的影响。模拟结果表明:6风机方案下隧道窑入口处进风均匀,热风扩散距离短,窑内热风流场整体均匀性较佳,综合性价比最高。研究结果为隧道窑入口进风的设计提供参考。

摘要：Single-gallium antimonide （GaSb）-nanowire- based photodetectors were fabricated on both rigid SiO2/Si substrate and flexible polyethylene terephthalate （PET） substrates, both of which exhibited high responsivity, fast- response, and long-term stability in photoswitching over a broad spectral range from ultraviolet to near infrared. Besides, the as-fabricated rigid device exhibited high responsivity of 7,350 A/W under illumination of 2 = 350 nm and light intensity P = 0.2 mW/cm^2, while the flexible device displays higher detectivity of 9.67 × 10^9 jones at 700 nm than the rigid one and lower noise equivalent power （NEP, NEP＊700 nm = 2.0 × 10^-12 W/Hz^1/2） for the much lower dark current on PET. The high responsivity, broad spectral detection from ultraviolet to near-infrared and long-term stability make GaSb nanowire one of the most important candidates to construct advanced optical sensors or other optoelectronic devices.

摘要：With the rapid development of portable devices and internet of things,the requirement of system wearability and integration accelerates the investigation of flexible multifunctional *** this study,we developed an integrated flexible sensing system with four nanowire-based sensors and a Ni microwire-based temperature *** four nanowirebased sensors are three kinds of photodetectors responding to lights with different wavelengths and a gas *** to the large surface volume ratio and considerable sub wavelength effect,all the nanowire-based sensors show good sensing response and excellent linear relationship between sensitivity and *** as-fabricated flexible sensing system can simultaneously detect environmental parameters,including temperature change,light intensities from UV-Visible to near infrared regions,and harmful gas *** flexible multifunctional sensing system therefore opens up a new way for the emerging portable and wearable electronics.

摘要：设计了一种滚筒式真空脉动干燥机。该干燥机由干燥滚筒、旋转接头、加热系统、控制系统、真空系统和传动系统组成。控制系统通过控制电磁阀可使干燥滚筒内的干燥压力在真空与常压之间有规律地变化。干燥滚筒在增加装料量的同时,还可通过旋转使物料受热均匀,提高机器的生产率。无核白鸡心葡萄的干燥试验表明,在干燥压力为7kPa,一个循环内真空干燥20 min,常压干燥4 min,干燥温度为60℃的条件下,干燥12 h,葡萄含水率可降至16.4%(湿基),糖酸比达到33.2。

摘要：A simple self-catalyzed chemical vapor deposition process was conducted to synthesize single-crystalline GaSb nanowires,where Ga droplets were utilized as the *** as-grown GaSb nanowires exhibited typical p-type semiconductor behavior with the calculated hole mobility of about 0.042 cm^2 V^-1 s^-*** photoresponse properties of the GaSb nanowires were studied by fabricating nanowire photodetectors on both rigid and flexible *** results revealed that the photodetectors exhibited broad spectral response ranging from ultraviolet,visible,to near-infrared *** the device on rigid substrate,the corresponding responsivity and the detectivity were calculated to be 3.86×10^3 A W-1 and 3.15×10^13 Jones for 500 nm light,and 7.22×10^2 A W-1 and 5.90×10^12 Jones for 808 nm light,respectively,which were the highest value compared with those of other reported Ga1-xInxAsySb1-y structure ***,the flexible photodetectors not only maintained the comparable good photoresponse properties as the rigid one,but also possessed excellent mechanical flexibility and *** study could facilitate the understanding on the fundamental characteristics of self-catalyzed grown GaSb nanowires and the design of functional nano-optoelectronic devices based on GaSb nanowires.

摘要：为保障农户收获后高水分粮食不落地安全储藏,针对一种仓壁透气中心带通风立筒的圆形钢网式农户储粮干燥仓,应用CFD法对收获后高水分小麦在进行机械通风时的气流场进行仿真分析,将仓内小麦堆等效为多孔介质,分析静压、动压、流量等空间分布规律。结果表明:仓内静压和动压值随半径(横向)增加呈指数衰减;柱面流量随半径呈幂函数衰减;横截面流量随高度呈指数衰减;粮堆区竖向通风均匀度显著优于横向(径向);流量分布为仓底>上粮面>仓壁,仓壁气流流量只占总流量的24.6%;实仓风速测试结果与仿真分析结果规律一致,平均相对误差为16.35%,表明基于多孔介质模型和CFD法分析钢网式储粮干燥仓的流场分析具有较好的准确性,研究结果为此类钢网式储粮仓流场分析和优化提供了方法和依据。

摘要：为了探索槟榔的优良加工工艺,研究采用不同水煮时间(10、20、30 min)和水煮温度(80、90、100℃)预处理工艺后槟榔的干燥特性和干燥后长径比变化情况;并研究不同干燥温度(50、55、60、65℃)和装载质量(16、24、32、40 kg/m2)条件下的干燥特性。结果表明:不同水煮时间对槟榔干燥后水分比的变化影响不显著;不同水煮温度对槟榔干燥后水分比的变化影响较显著。不同水煮时间和水煮温度条件下槟榔干燥后的长径比变化差异显著,长径比随着水煮时间的延长而降低,随着水煮温度的升高而升高。较优的水煮预处理工艺为:水煮时间10 min、水煮温度100℃。干燥温度和装载质量对槟榔干燥的含水率变化有显著影响,且干燥速率随着干燥温度的升高而增大,随着装载质量的增加而减少。槟榔的热风干燥没有恒速干燥阶段,只有降速干燥阶段。较优的热风干燥工艺为:干燥温度60℃、装载质量24 kg/m2。

摘要：Hybrid sodium-ion capacitors(SICs)bridge the gap between the supercapacitors(SCs)and batteries and have huge potential applications in large-scale energy ***,designing appropriate anode materials with fast kinetics behavior as well as long cycle life to match with the cathode electrodes remains a crucial ***,Nb2O5 nanotubes and nanowire-to-nanotube homo-junctions were directly grown on the carbon cloth(CC)via a simple hydrothermal process through regulating the pH value of *** as-prepared Nb2O5@CC nanotubes displayed a high reversible capacity of 175 mA hg-1 at the current density of 1Ag-1 with the coulombic efficiency of 97%after 1500 ***,the SICs fabricated with Nb2O5@CC and activated carbon(AC)electrode materials showed a high energy density of 195 W h kg-1 at 120 W kg-1,a power density of 7328 W kg-1 at 28 W hkg-1and 80%of the capacitance retention after 5000 ***,the flexible SIC devices can operate normally at various bendable *** Nb2O5@CC nanotubes in this work can be promising electrode materials in flexible and wearable energy storage devices.

摘要：将气体射流冲击干燥技术应用于红枣的干燥,研究了其在不同干燥风温(55、60、65和70℃)和风速(6、9、12和15 m/s)下的收缩特性、考虑收缩的水分有效扩散系数以及收缩活化能。研究结果表明:随着干燥风温和风速的升高,红枣的体积相对收缩率呈现先增大后减小的趋势;考虑收缩的水分有效扩散系数随着干燥风温和风速的升高而增大,且随着干基含水率的降低先增大后减小;通过阿伦尼乌斯公式计算出红枣收缩活化能为12.81 k J/mol。该研究为红枣干燥后体积的留存提供了技术依据。