瞬态法测量木材热物性的理论与实验研究

为了有效测量不同含水率木材的热物性，提出了一种新的瞬态平面热源测量法。在一定的简化条件下求解一维有限厚度平板的非稳态导热微分方程，得到了平板木材试样的温度随时间和平板厚度变化的短时间公式，并由此建立了在恒定热流加热条件下木材热物性的瞬态测量实验台。利用此实验台测量了不同含水率的落叶松和红松试样的径向导热系数、热扩散系数和比定压热容等热物性参数并与文献数据进行了比较。结果表明，该瞬态测量方法具有较高的精度，比准稳态法更好地满足了一维导热条件，利用此方法能够有效而快速地对不同含水率的木材进行热物性测量。     

Y320滚齿机的刀架改造

为了扩大Y320滚齿机的加工范围,针对行星架渐开线花键的加工,设计了附加刀架。文中介绍了附加刀架的设计原理、结构特点及使用时分齿挂轮的计算方法。     

制动闸斜孔的加工

在我厂MXA-380型电牵引采煤机中，有一制动闸的闸壳，名为法兰壳。此法兰壳毛坯是铸件，结构比较复杂，加工难度比较大，特别是壳体上的6个斜孔，润滑油通过6个斜孔润滑轴承，否则润滑油起不到润滑轴承的作用，轴承易损坏，因此6个斜孔的加工非常重要。     

艾柯夫采煤机摇臂一级法兰返修方案设计

简要介绍了艾柯夫采煤机摇臂一级法兰大修中存在的外圆啃伤,内孔尺寸超差和销孔位置度偏差3个问题,根据工件不同位置的装配性能和尺寸要求,以减小变形和减小加工余量为原则,分别制定了以XHD646、Fe基不锈钢粉末和ER49-1为焊材的手弧焊、激光熔敷焊和混合气体保护焊为主的方案设计,最终使工件修复完好,交付使用。     

Promising red phosphors LaNbO4:Eu3+,Bi3+ for LED solid-state lighting application

La0.75NbO4:Eu3+0.25 and La0.65NbO4:Eu3+0.25,Bi3+0.10 phosphors were synthesized by solid-state reaction method,and their photoluminescence properties were discussed in detail.With the increased incorporation of the co-activator Bi3+,the charge transfer(CT) bands of Nb5+→O2-and Eu3+→O2-(-280 nm) weakened and a new and significant broad band Bi3+-O2-(-330 nm) appeared,while the peaks at 395 and 466 nm assigned to f-f transitions of Eu3+ was slightly changed.Compared with the commercial phosphor Y2O2S:0.05Eu3+...     

温度和热流方向对木材传热特性的影响

以4种常用木材为实验对象,研究了不同温度和热流方向对木材的导热系数、比热和热扩散率的影响,并分析了热物理性质变化的原因.实验结果表明：温度和热流方向对木材的传热特性影响显著.在25～200 ℃内,木材导热系数和比热呈现非线性变化,开始是随着温度的升高而逐渐增加,在接近80 ℃时达到一个峰值,然后又逐渐降低.而木材热扩散率的变化与温度的关系不明显.同一温度下,木材的顺纹（热流平行于纹理方向）导热系数要大于其横纹（热流垂直于纹理方向）导热系数,前者是后者的2.4～3.0倍.     

火焰原子吸收法测定电镀用硫酸铜中微量镍

采用基体匹配消除基体干扰,通过火焰原子吸收法测定电镀用硫酸铜中微量镍。该方法测定的相对标准偏差在5%以内,回收率95.2%~103.7%。同时量化硫酸铜基体背景吸收值。     

Luminescent properties of Ba3Gd（BO3）3：Eu^3＋ phosphor for white LED applications

Luminescent material Ba3Gd(BO3)3 doped with Eu3+ ion was prepared by high temperature solid-state method. The preparing conditions, luminescent properties, and particle morphology of Ba3Gd(BO3)3:Eu3 + phosphor were studied with X-ray diffraction (XRD), fluorescence spectroscopy, and scanning electron microscopy (SEM). The results obtained by XRD showed that pure phase of Ba3Gd(BO3)3 was obtained at 1000℃. Images from SEM displayed that the particles of Ba3Gd(BO3)3:Eu3+ phosphor had a spherical shape with an average diameter of about 200-400 nm. The luminescence spectra showed that Ba3Gd(BO3)3:Eu3+ phosphor was effectively excited by the near ultraviolet (UV) light (396 nm) and blue light (466 nm). The main emission peaks of Ba3Gd(BO3)3:Eu3+ phosphor were assigned to the supersensitive transition 5D0-7F2 (611 and 616 nm) of Eu3+ ion when samples were excited at 255 and 396 nm, respectively, and the luminescent intensity of Ba3Gd(BO3)3:Eu3+ at 611 and 616 nm reached to the maximum when the doped content of Eu3+ ion was 10mol.%. Therefore, this phosphor could be a promising red component for possible applications in the field of white LED.