小型绝对式金属光电编码盘

为了提高光电编码器的抗强冲击振动性能,设计了一种新型的小型绝对式金属光电编码盘。首先介绍了小型金属光电编码器的工作原理;然后采用单圈循环格雷码的编码方式,在1圈码道上实现0°～360°的全量程绝对编码,设计出绝对式金属码盘;最后依据金属码盘码道的排列方式及精码、粗码信息的采集要求设计出金属狭缝盘。码盘及狭缝盘基底材料采用不锈钢,通过采用电子学细分技术、精粗校正可使编码器分辨力达到5.27″。小型绝对式金属光电编码器具有成本低、抗冲击性强、分辨力高等特点,在强冲击、强振动工作环境及对体积质量有严苛要求的场合具有很高的应用价值。

一种新型高可靠光电倍增管的研制

主要介绍一种具有良好能量响应特性的金属盘封结构的光电倍增管的特点和性能指标 ,它的机械性能大大超过传统结构类型的光电倍增管 ,特别能满足军事、地质、石油。

Analysis of high-power disk laser welding stability based on classification of plume and spatter characteristics

Classification of plume and spatter images was studied to evaluate the welding stability. A high-speed camera was used to capture the instantaneous images of plume and spatters during high power disk laser welding. Characteristic parameters such as the area and number of spatters, the average grayscale of a spatter image, the entropy of a spatter grayscale image, the coordinate ratio of the plume centroid and the welding point, the polar coordinates of the plume centroid were defined and extracted. Karhunen-Loeve transform method was used to change the seven characteristics into three primary characteristics to reduce the dimensions. Also, K-nearest neighbor method was used to classify the plume and spatter images into two categories such as good and poor welding quality. The results show that plume and spatter have a close relationship with the welding stability, and two categories could be recognized effectively using K-nearest neighbor method based on Karhunen-Loeve transform.

高压条件下油脂表面形貌特征研究

实验装置是将一个金属针垂直悬于金属板的上方,同时在金属板上滴一些油脂。本实验研究了当在金属板上施加恒定高压电时,金属板上油脂表面所形成的"蜂窝"状格子结构的实验现象与规律。主要考察了不同类型油脂、金属板上施加的电压大小、针尖与金属板的距离等因素对油滴形成的蜂窝状格子结构的影响。研究结果表明金属板上所施加的电压和针尖-金属板的距离对油滴形成的"蜂窝"状格子结构为主要影响因素。"蜂窝"状格子的个数与金属板上所施加的电压和针尖-金属板的距离均有非线性增加关系;当金属板上所加电压为16k V^21k V,针尖-金属板的距离为3.0cm时,蜂巢个数介于18个~36个,蜂巢格子的直径介于2.5cm^3.6cm,深度介于2mm^3mm。基于我们的知识,截至目前类似的研究工作在国内外鲜见研究报道。

套桶式洗衣机脱水桶偏心故障的修复

套桶式洗衣机脱水桶出现故障,需拆下脱水桶,调节脱水桶的轴线,使其与离合器内外轴的轴线重合,具体方法如下: (1)在取出脱水桶之前,拿下防水罩时,可用短尺检查脱水桶与洗涤外桶之间的间距,间距小的方位,便是脱水桶轴线偏移的方向,要用铅笔在该方位的平衡圈上作一记号。 (2)取下脱水桶后,将其倒置于工作台上(平衡圈向下)。此时可看到脱水桶底部的金属盘,旋松金属盘上所有螺钉,找到与铅笔所作记号对应的脱水桶壁上的螺钉。

Role of ADAM10 and ADAM17 in CD16b Shedding Mediated by Different Stimulators

Objective To investigate the main proteinases responsible for CD16b shedding under different stimulators. Methods HEK293 cell line stably expressing CD16b was constructed by lentivirus system. The cell line was then overexpressed with a disintegrin and metalloproteinase 10 （ADAM10） or ADAM17, sup- pressed with short hairpin RNA of ADAM10 or ADAM I 7, and reconstituted with ADAM 10 or ADAM17, respectively. After each treatment, the cell line was stimulated with ionomycin or phorbol 12-myristate- 13-acetate （PMA） for 12 hours. The soluble CD 16b released from cell membrane was detected by immuno- precipition and immunoblot. Quantitation was then implemented to compare the amount of soluble CD 16b in cell supernatant after stimulation. Results HEK293 cell line stably expressing CD16b was successfully established. When CDI6b ex- pressing cell line was overexpressed with ADAM 10, shedding of CD 16b was increased after stimulation with ionomycin but not PMA; when the cell line overexpressed with ADAM I7, shedding of CDI6b was increased after stimulation with PMA but not ionomycin. Similarly, when ADAM10 was suppressed by short hairpin RNA, CD 16b shedding was decreased after stimulation with ionomycin; when ADAM 17 was suppressed by short hairpin RNA, CD16b shedding was decreased after stimulation with PMA. The shedding of CD16b was increased again when CD16b expressing cell line was reconstituted with ADAM10 and stimulated by ionomycin or reconstituted with ADAM 17 and stimulated by PMA. Conclusions Both ADAM10 and ADAM17 could shed CD16b, but they possess differed prefer- ences. ADAM10 is the main sheddase under stimulation of ionomycin, while ADAM17 is the main sheddase under stimulation of PMA.

Characteristics of the ore forming fluid from the zinc poly-metallic deposit in the Mopan mine area,Guangxi Nandan

Fluid inclusions from samples from the layered and veined mineralized belt in the Mopan mine area were studied using microscopic temperature measurements and laser Raman spectroscopy.Further studies were conducted on the nature and source of the ore forming fluid and on the mechanism of deposit formation.The results show that there are three types of inclusions that occur in both the layered and veined ore body.These are liquid inclusions,CO 2 inclusions with a liquid phase,and NaCl-H 2 O multiphase inclusions.The fluid inclusions in both the layered and veined ore bodies have similar characteristics.The ore forming fluid is strongly reducing,was exposed to low to medium temperatures,salinity,and pressures.The source of this ore forming fluid was a mix of submarine volcanic spring(blow-piping),magmatic hydrothermal jet,and underground water.

Poly-active centric CoO-CeO/Co-N-C composites as superior oxygen reduction catalysts for Zn-air batteries

Zinc-air battery is one of the most promising next-generation energy conversion and storage systems.Green and low-cost catalysts with high oxygen reduction reaction(ORR)catalytic activity are desired to meet the requirements of Zinc-air batteries.Herein,poly-active centric Co3O4-CeO2/Co-N-C(ketjenblack carbon)catalysts were prepared by a facile method.The Co3O4 and CeO2 nanoparticles are uniformly anchored on the surface of Co and N doped carbon support.The half-wave potential of Co3O4-CeO2/Co-N-C in the rotating disk electrode testing is close to that of Pt/C.The Zn-air battery using Co3O4-CeO2/Co-N-C as the cathode catalyst can provide a high specific capacity of 728 mA h g^-1 at 20 mA cm^-2 and maintain a stable discharge voltage.The remarkable catalytic performance is mainly attributed to the synergistic effect among Co3O4,CeO2 and Co-N-C,the outstanding electrical conductivity and the large surface area.Benefitting from the high catalytic activity,environmental friendliness and the facile synthesis process,Co3O4-CeO2/Co-N-C catalyst lends itself well to a great prospect in the application of metalair batteries.

Effect of Electro-acupuncture on Matrix Metalloproteinase in Degenerated Cervical Intervertebral Disc of Rats

Objective： To observe the effect of electro-acupuncture on matrix metalloproteinase in degenerated cervical intervertebral disc rats. Methods： The rat model of cervical intervertebral disc degeneration was induced by unbalanced dynamic and static forces, then the rats were randomly allocated to model group, electro-acupuncture group Ⅰ（acupoints Dazhu （BL 11） and Tianzhu （BL 10） were electro-acupunctured）, and electro-acupuncture group Ⅱ（acupoints Dazhu （BL 11）,Tianzhu （BL 10） and Shenshu （BL 23） were electro-acupunctured）, with the normal rats as control, then the HE staining method was adopted to observe the morphological change of cervical intervertebral disc and the immunohistochemical staining method was used to detect the matrix metalloproteinases-l（MMP-1） and matrix metalloproteinases-3（MMP-3） in cervical intervertebral disc. Results： The morphological observation showed that after electro-acupuncture treatment, the degrees of cervical intervertebral disc degeneration in electro-acupuncture group Ⅰ and electro-acupuncture group Ⅱ were alleviated, and the electro-acupuncture group Ⅱ was superior to electro-acupuncture group Ⅰ. The expressions of MMP-1 and MMP-3 in degenerated cervical intervertebral disc were increased （P〈0.01）, and after electro-acupuncture treatment, the expressions of MMP-1 and MMP-3 in degenerated cervical intervertebral disc were decreased, especially the electro-acupuncture group Ⅱ presented the better effect as compared with electro-acupuncture group Ⅰ（P〈0.05）. Conclusions： Electro-acupuncture at acupoints Dazhu （BL 11） and Tianzhu （BL 10） had a certain therapeutic effect on cervical intervertebral disc degeneration, and in combination with acupoint Shenshu （BL 23）, this therapeutic effect could be enhanced, its action mechanism might be that electro-acupuncture can reduce the expressions of MMP-1 and MMP-3 in degenerated cervical intervertebral disc, inhibit the degradation of matrix in intervertebral disc, so as to relieve cervical intervertebral disc degeneration.