无粘结预应力施工探讨

随着工程实践和设计、施工技术的不断发展完善,目前已形成设计、施工、无粘结预应力 钢筋的加工制作互相配套的技术体系,该项技术在国内得到普遍的推广和应用,尤其在高层建筑、大荷载、 大跨度梁板建筑结构中。     

天然树脂A在聚氯乙烯电缆料中的应用研究

将天然树脂Ａ改性后，代替聚氯乙烯电线电缆料加工过程中传统使用的盐基性铅盐稳定性，生产无铅电线电缆料，经检测符合ＧＢ８８１５－８８标准，为天然树脂Ａ的合理利用提供了新的途径。     

钢丝网架聚苯乙烯夹心板墙抹灰面层裂缝防治

钢丝网架聚苯乙烯夹心板是一种性能优良的轻质墙体材料,具有诸多优点。但在施工中也有不尽人意的地方——即夹心极墙抹灰面层在板间拼缝处、阴阳角等部位容易出现裂缝。针对这一现象,作者提出了几点注意事项和有效的防治措施。     

钢丝绳切断机主要零部件的优化设计

根据森工、煤矿等行业使用钢丝绳量大的要求,对钢丝绳切断机进行了设计,并给出了钢丝切断机的主要零部件,即刀床支座、刀床、刀片及刀片支杆的具体优化设计方法和计算过程。     

丝束电极研究水基防锈液的防锈性能

通过丝束电极测试电阻分布,研究了水基防锈液的防锈性能.测试结果表明,水基防锈液的电阻分布在一定范围,相邻区域的电阻存在差异.表明水基防锈液对金属的防锈性能存在一定的不均匀性.根据丝束电极的电阻分布可判别防锈液的防锈能力:在较低阻区出现的电极数越多,则防锈液防护金属的能力越弱,反之则越强.丝束电极评价防锈液的防锈性能结果和经典试验结果有较好的对应性,且具有所需时间短,结果定量的优势.丝束电极电化学法为快速、准确判别防锈液防锈性能提供了一种新型的方法.     

基于内联网的农村智能化小区的构建

随着农村经济的日益发展和农民生活水平的逐步提高，农民对住宅小区智能化配置提出了更高的要求。为此，介绍了农村住宅小区智能化管理系统和综合布线的构建方案。     

蝼蛄爪趾特性仿生钢丝辊刷除椰衣装置设计及参数优化

针对手工剥除椰子纤维外衣中存在的加工效率低、易造成人员受伤等问题,设计了一种基于蝼蛄爪趾特性的仿生钢丝辊刷除椰衣装置。该装置主要由钢丝辊刷、椰子夹紧机构和进给机构组成,其工作时依靠钢丝断面刃口勾刷椰衣纤维,结合钢丝的弹韧性实现除衣后不损坏椰壳。利用除椰衣装置开展参数优化试验,并运用Design Expert软件进行试验方案设计和结果数据分析。试验结果表明,辊刷转动速度对除椰衣厚度影响最大,刷毛栽植间距影响次之,刷毛直径影响最小;在辊刷转动速度一定时,随着刷毛栽植间距的增加,除椰衣厚度呈先增大再减小的变化趋势,但当辊刷转动速度增大时,除椰衣厚度的变化量不明显;当刷毛栽植间距一定时,随着辊刷转动速度的增大,椰衣去除的厚度会逐渐上升,刷毛直径的大小对除椰衣厚度的影响较为显著(P0.05)。试验数据回归分析结果表明,除衣装置的最优组合参数为辊刷转动速度是970rad/min,刷毛直径是6mm,刷毛栽植间距是10mm,预测在最优参数组合下的除衣厚度为31.24 mm,通过重复试验证明最优组合参数可以到达规定的除衣厚度,且不损伤内部椰壳,满足椰子深加工需要。     

Complications after two transphyseal bridging techniques for treatment of angular limb deformities of the distal radius in 568 Thoroughbred yearlings

Reasons for performing study: Surgical correction of carpal angular limb deformities by growth retardation is commonly undertaken with a screws and tension band wire loop technique (S&W) or a single transphyseal screw (STS). This study compares complications after S&W and STS bridging in the distal radius of Thoroughbred yearlings. Objective: To compare the prevalence of complications serious enough to require follow‐up radiographs following either S&W or STS surgery for growth manipulation in the distal radius of Thoroughbred yearlings. Methods: Medical records and radiographs from Thoroughbred yearlings (age range 261–457 days) treated for carpal angular limb deformities at a single hospital over 2 years were reviewed. Each of the techniques was used exclusively during a single year. The complication threshold criterion for inclusion was the need for nonroutine radiographs of the operated site anytime after implant insertion or removal. Results: Of 568 horses, 253 received S&W and 315 received STS. Horses were of similar age at the time of surgery for STS and S&W. Single transphyseal screws were left in place for a significantly shorter amount of time (16 days). Sex, the limb(s) treated and medial vs. lateral placement were not significantly different between techniques. Complications included physitis post implant removal, metaphyseal collapse post implant removal, infection, overcorrection and seroma formation severe enough to require radiography. Physitis and metaphyseal collapse occurred significantly more frequently with STS compared with S&W. Infection, overcorrection and seromas were not significantly different between techniques. Conclusion: The STS and S&W techniques are both viable treatment options for correction of carpal angular limb deformities. However, horses treated with the STS technique have a significantly increased risk of developing physitis or metaphyseal collapse. Potential relevance: Horses treated with STS bridging have a significantly increased risk of developing the post correction complications of moderate to severe physitis and metaphyseal collapse compared with horses treated with S&W bridging.     

Tactical treatment with copper oxide wire particles and symptomatic levamisole treatment using the FAMACHA(©) system in indigenous goats in South Africa

Haemonchosis is considered to be the most economically important gastrointestinal disease of small ruminants in the tropics and subtropics. However, chemical anthelmintics, which were the mainstay of control, have been compromised by a high prevalence of resistance worldwide. Copper oxide wire particles (COWP) have been shown to have anthelmintic effects, but few studies have examined their use under field conditions. The use of COWP was therefore evaluated as a tactical anthelmintic treatment in indigenous goats raised under communal farming conditions in Bergville, KwaZulu-Natal Province, South Africa. At the beginning of the summer rainfall season (October 2007), the faecal egg counts of 172 female goats belonging to 15 farmers were determined and this sampling continued every four weeks until the second week of January 2008. The goats within each of the 15 herds were ranked according to their faecal egg counts for this week. The goats were sequentially paired off within each ranking starting with those goats with the highest counts. One goat from each pair was randomly allocated to a treated or control group. Two weeks later, a 4 g COWP bolus was randomly administered to each goat in the treated group. Faecal egg counts were carried out on the goats two weeks following treatment, and the sampling of the goats then proceeded every four weeks until October 2008. Except for the six-week period prior to the administration of the COWP, the goats were examined according to the FAMACHA^© system and symptomatically treated with 12 mg/kg levamisole when anaemic. The percentage reduction in faecal egg count due to the COWP treatment was 89.0%. Mean pre- and post-treatment faecal egg counts for the COWP-treated group (n = 73) were 2347 eggs per gram of faeces (epg) and 264 epg, respectively. The corresponding values for the untreated controls (n = 66) were 2652 epg and 2709 epg. The prevalence of Haemonchus spp. larvae in pre- and post-treatment faecal cultures was 72% and 46%, respectively. Symptomatic anthelmintic treatments in combination with mid-summer tactical treatments with COWP appear to be useful strategies for the control of Haemonchus contortus in indigenous goats in this farming system and this approach could have application in other similar agro-ecological zones.