温室苗种自动化移植设备的应用研究

针对温室种植技术的快速发展,以及温室人工苗种移植效率低和苗种损坏等问题,设计了一种自动苗种移植机,并对其搅拌机构、螺旋输送机构、切块机构及其功率消耗进行了理论计算和试验验证。结果表明:螺旋挤压机构有利于培植土生成,切块机构动作迅速。自动苗种移植设备降低了农民的劳动强度,提高了苗种成活率。样机试验表明:理论分析和样机试验较吻合,整机结构合理,具有很好的移植效果,达到了预期设计目标。     

浅析气力除尘系统控制技术在木材力口工领域的应用

目前，气力输送与除尘技术相结合构成的气力除尘系统已在木材加工行业中占有举足轻重的地位。本文对气力除尘技术进行了概括性论述，阐述了气力除尘系统控制技术的主要控制方式和存在的问题，并对气力除尘控制技术的发展趋势进行了分析。     

基于SINUMERIK 802S／802C系统数控车床螺纹加工

螺纹的类型很多，在数控车床中，对于不同系统的车床加工螺纹编程的指令也不尽相同，在SINUMERIK 802S／802C系统数控车床中对普通螺纹和梯形螺纹的加工分别加以分析，指出不同类型的螺纹的加工方法也不相同。     

输送木片螺旋机的结构特点

螺旋机作为一种输送设备在矿山、水泥、粮食和造纸等行业中已得到了广泛的应用,一般适用于输送粉状、粒状的物料。在木片厂中,由于场地的限制,输送木片也会用到螺旋机。因木片的流动性比较差,使用螺旋机输送木片,其结构特点与输送其他物料的螺旋机有所不同,如果采用同一结构形式,就会出现送料不畅和堵料等现象,影响生产的正常进行。分析螺旋机在输送木片中的一些结构特点。     

Early detection and treatment of screw loosening in triple pelvic osteotomy

OBJECTIVE: To detect early screw loosening in triple pelvic osteotomy (TPO) and to evaluate the efficacy of retightening using fluoroscopic guidance and minimally invasive surgery to maintain acetabular alignment and achieve bone healing. STUDY DESIGN: Prospective clinical study. SAMPLE POPULATION: Sixteen dogs that had TPO. METHODS: Dogs (16) had TPO (21) by using pre-angled plates secured with 3.5 and 4.0 mm screws, with ischiatic or iliac cerclage, for osteosynthesis. In all but 1 TPO at least 1 screw was inserted into the sacral body (43 screws). The mean radiographic screw length inserted in the sacrum was 10.2 mm, and the mean percent sacral engagement was 22%. Dogs were examined clinically and radiographically immediately postoperatively, and at 10, 30, 60, and 90 days to evaluate screw position. Loose screws were retightened through stab incisions using fluoroscopy to locate the screw. RESULTS: TPO was performed without operative complications. At 10 days, 12 TPOs (57%; 11 dogs) had loose screws primarily located in the cranial aspect of the plate. This represented 20% (25) of the inserted screws. In 5 dogs, screw loosening resulted in medial rotation of the acetabular segment. All loose screws were retightened; 3 screws loosened again in 2 dogs and were detected at 60 days. However, the osteotomies healed with the planned acetabular rotation without further intervention. Screw tightening corrected the acetabular segment displacement. Screws correctly seated at 10 days did not subsequently loosen. Clinical and radiographic outcome was judged excellent in all dogs. CONCLUSION: Loose screws in TPO plates can be identified by 10 days postoperatively and retightened using fluoroscopic guidance to achieve acetabular realignment and healing without need for further surgery. CLINICAL RELEVANCE: Postoperative radiographic evaluation of screw position at 10 days after TPO is recommended to detect loose screws. Retightening loose screws should be considered as an alternative to TPO revision or confinement, especially in immature dogs.     

Comparison of computer-assisted surgery with conventional technique for the treatment of axial distal phalanx fractures in horses: an in vitro study

OBJECTIVES: To compare the precision obtained with computer-assisted screw insertion for treatment of mid-sagittal articular fractures of the distal phalanx (P3) with results achieved with a conventional technique. STUDY DESIGN: In vitro experimental study. SAMPLE POPULATION: Thirty-two cadaveric equine limbs. METHODS: Four groups of 8 limbs were studied. Either 1 or 2 screws were inserted perpendicular to an imaginary axial fracture of P3 using computer-assisted surgery (CAS) or conventional technique. Screw insertion time, predetermined screw length, inserted screw length, fit of the screw, and errors in placement were recorded. RESULTS: CAS technique took 15-20 minutes longer but resulted in greater precision of screw length and placement compared with the conventional technique. CONCLUSION: Improved precision in screw insertion with CAS makes insertion of 2 screws possible for repair of mid-sagittal P3 fractures. CLINICAL RELEVANCE: CAS although expensive improves precision in screw insertion into P3 and consequently should yield improved clinical outcome.     

基于模糊Borda组合评价法筛选适宜基质袋培的螺丝椒品种

【目的】筛选适合基质袋培的高产优质螺丝椒品种，为陕北地区无土栽培辣椒的发展提供依据。【方法】以20个螺丝椒品种（丝路新星、丝路之星、楼兰之星、特早一尺长、中农青螺王子、陇旋339、博收019、HP29017、HP29037、HP29047、HP29082、西域长龙、久保田螺椒王、金椒6号、金椒8号、金椒9号、金椒12号、博陇（37-94）、茎毛802和沃尔斯天萝）为试材，进行基质袋栽培，测定并比较分析各品种辣椒果实的单果质量、果皮厚度、果实长度、维生素C含量、可溶性蛋白含量、游离氨基酸含量、还原糖含量、可溶性总糖含量、硝态氮含量和产量等10项指标，对各指标的相关性进行Pearson分析。同时，采用主成分分析法、TOPSIS分析法、隶属函数分析法和灰色关联度分析法对各品种螺丝椒的产量和品质指标进行评价，经事前一致性检验（Kendall-W）后，采用模糊Borda评价法进行组合评价，以筛选出适合陕北地区基质袋培的螺丝椒品种。【结果】20个螺丝椒品种的单果质量为25.62～52.83 g，以陇旋339最大；果皮厚度为1.58～2.17 mm,以沃尔斯天萝最厚；果实长度为19.42～30.55 cm,以HP29082最长；维生素C含量为276.37～1 058.09 mg/hg,以金椒8号最高；可溶性蛋白含量为0.97～1.61 mg/g,以金椒12号最高；游离氨基酸含量为393.78～969.69 μg/g,以沃尔斯天萝最高；还原糖和可溶性总糖含量分别为3.82%～6.65%及9.87%～13.91%，均以博收019最高；硝态氮含量在各品种间无显著性差异；产量为9 625.98～84 600.00 kg/hm²,以丝路新星最高。4种单一综合评价方法的评价结果存在差异，主成分分析法的评价结果与其他分析方法评价结果的相关性较弱，其余3种单一评价方法间评价结果的相关系数通过了Kendall-W协和系数事前检验，具有相容性，可进行组合评价。模糊Borda组合评价方法的评价结果通过了事后检验，具有可信性，其评价结果显示排名前5位的螺丝椒品种为丝路新星、HP29047、丝路之星、陇旋339和博收019。【结论】丝路新星、HP29047、丝路之星、陇旋339和博收019为适宜陕北地区基质栽培的螺丝椒品种。     

胶带输送机提高运量的几种方法

着眼于不更换运输设备，仅从提带速或增大胶带输送机的货载断面这两个方面入手，来提高胶带输送机的运输能力；探讨其可行性并在理论上进行分析比较