管

Furthermore the performances of heat transfers including corrugate plate, tube and fin-tube were compared under the same conditions. The results show that when the air frontal velocity is between 2.45 and 4.1m/s, the overall heat-transfer coefficient of plate heat exchanger ranges from 100 to 160 W/m^2/ equal to one sixth of that of fin- tube cooler based on tube outside area, which is about 70% higher than that of tube cooler. The volumetric heat transfer capacity of plate cooler is 1.5 times as that of fin-tube cooler and 15 times as that of tube cooler. The heat transfer capacity of per unit power of plate cooler is 5.5 times as that of tube cooler and similar results for fin-tube cooler.

在相同工况下，比较了波纹板式、光管式和翅片管式空冷器的性能指标，结果表明：迎面风速在2.45~4.1m/s之间，波纹板式空冷器传热系数达到100~160W/平方公尺/℃；约比光管式提高70%，但只有以管束外表面为基准的翅片管式传热系数的六分之一；板式空冷器单位体积换热量约是翅片管式空冷器的1.5倍，是光管式的15倍；板式空冷器单位功耗换热量约是光管式空冷器的5.5倍，而翅片管式空冷器与光管式空冷器则相差不大。

Professional production and sale of "a relaxation" brand various types of cloth hose, the main varieties: cloth pipes, air pipes, pipelines, transmission of acid-base tubes, steam pipes, pipe sand blasting, cement injection tube, lose food pipe, Oil hot food pipe, bridge hole system pipes, to attract pipe, oil heat pipe.

专业生产，销售"创驰"牌各类夹布胶管，主要品种：夹布输水管，空气管，输油管，输酸碱管，蒸汽管，喷砂管，水泥喷射管，输食品管，油热食品管，桥梁制孔管，吸引管，耐油热管。

Conclusion1 Critically ill patients with indwelling catheters were of the high positive rate of microorganisms,and microorganism spectrum was of special properties;BF formed mainly inside the catheter,the occurrence rate of BF inside the catheter was high and the formation time was short;Changes on catheters and the result of microorganisms was positively correlated with the BF formation.2 Indwelling catheter time was the independent risk factors for the BF formatiom, while age、APACHEⅡscore、sex、urine sugar and the types of antibiotic usage were the potential risk factors for the BF formation;Nurses should perfect the catheter measures for critical ill patients,emphasis on the assessment of risk factors of BF formation,and implement special care in high-risk patients.3 In the early stage of BF formation,irrigation could play the role of eradicative BF effectively;While later,it couldn't,but it can delay the speed of BF formation and maturation;In the choice of washing methods,injection type washing method is superior to infusion.

结论1重危患者留置尿管微生物培养阳性率高，且微生物菌谱具有特殊性；重危患者尿管表面BF主要在尿管内壁形成；内壁BF的发生率高，形成时间短；肉眼观察尿管表面改变情况以及微生物鉴定结果与BF形成呈正相关。2尿管留置时间是重危患者留置尿管表面BF形成的独立危险因素；年龄、APAcHEⅡ评分、性别、尿糖定性以及抗生素使用种类是其可能的危险因素；护理过程中应完善重危患者尿管护理措施，注重对BF危险因素的评估，并对高危患者实施重点护理。3 BF形成早期，冲洗能发挥较好的清除作用；BF形成后期，冲洗无法彻底清除尿管表面BF，但冲洗能延缓BF形成与成熟的速度；在冲洗方式的选择上，注洗式冲洗法对尿管BF的清除效果优于输注式冲洗法。

The head is slowly turned 90° toward the side where nystagmus is induced less intensely. Then the head is rotated 180° rapidly toward the opposite side. This article reports three cases of the ageotropic form of HC-BPPV that were cured by rapid head rotation. The three cases demonstrated that rapid head rotation was an effective maneuver to treat cupulolithiasis on the utricle side. It is recommended that rapid head rotation can be used for therapeutic diagnosis: If nystagmus subsides immediately after this maneuver, the diagnosis is cupulolithias is on utricle side. If nystagmus changes into the geotropic form, the diagnosis is cupulolithiasis on canal side or canalolithiasis in the anterior arm of horizontal semicircular canal. A repositioning maneuver for geotropic form can then be applied to treat these patients.

逆地眼振型水平半规管良性阵发位置性眩晕的3种耳石可能位置如下：水平半规管前臂的管耳石、管侧的顶帽沉石(canal side cupulo-lithias1s)与囊侧的顶帽沉石，本文报告3例以快速转头治疗逆地眼振型水平半规管良性阵发位置性眩晕成功的病例，显示快速转头法对囊侧的顶帽沉石具迅速有效的治疗效果，对於逆地眼振型水平半规管良性阵发位置性眩晕的治疗，作者建议先以快速转头作治疗性诊断，若病人马上复原，诊断为囊侧的顶帽沉石；若眼振转为向地型，则诊断为水平半规管前臂的管耳石或管侧的顶帽沉石，进一步再以向地型的耳石复位法治疗病人。

For naturally cooled monobloc barrel, its thermal condition in regular regime can be evaluated by measuring the outside temperature of two arbitrary rounds;(2) During a sustained firing process, unsteady heat conduction exists in a monobloc barrel, whereas unsteady and quasi steady heat conduction exist with actively cooled composite barrels, meaning that the thermal condition changes from uncontrolled to controlled;(3) Different combinations of the convective heat transfer coefficient h and thickness of gun barrel δ have much effects on cooling the bore temperature.

利用有限元软件分析了某大口径火炮身管的温度场分布，并对自然散热条件下的单筒身管和主动冷却条件下的复合身管温度场进行了比较，其结果为(1)身管温度场分布存在初始和正规工况阶段，后者的单筒身管热状态可以通过测定任意两发身管外表面温度来评估；(2)持续射击过程中，单筒身管始终处于非稳态导热过程，主动冷却身管则包括非稳态和准稳态两个过程，实现了身管热状态由不可控向可控转变；(3)对流传热系数h和身管壁厚δ的组合对降低内膛温度具有很大影响。

Professional production and sale of "a relaxation" brand various types of cloth hose, the main varieties: cloth pipes, air pipes, pipelines, transmission of acid-base tubes, steam pipes, pipe sand blasting, cement injection tube, lose food pipe, Oil hot food pipe, bridge hole system pipes, to attract pipe, oil heat pipe.

专业生产，销售&创驰&牌各类夹布胶管，主要品种：夹布输水管，空气管，输油管，输酸碱管，蒸汽管，喷砂管，水泥喷射管，输食品管，油热食品管，桥梁制孔管，吸引管，耐油热管。

The heavy-caliber petroleum pipe line, the air conduit, the seamless steel pipe, the welded pipe, the stainless steel steel pipe (Fang Xing, moment, circle stainless steel pipe and so on), fittings, the cold rolling seamless tube, the box thread seamless steel pipe, the cold draw seamless steel pipe, the corrosion preventing special steel pipe, the compo pipe, the boiler pipe, the bushed bearing and so on conical seamless steel pipe, seamless heterogeneous steel pipe, metal corrugated pipe, industry welded pipe, carbon steel tube and so on, construct the steel pipe, the multiple-unit tube, the compound steel pipe, the wire conduit, the thread steel pipe welded steel pipe, the pot galvanize steel pipe, the electricity galvanization steel pipe, the KBG line drive pipe, the delivery pipe and so on;..

大口径输油管、输气管、无缝钢管、焊管、不锈钢钢管（方型、矩型、圆型不锈钢管等）、锥型无缝钢管、无缝异型钢管、金属波纹管、工业焊接管、碳钢管等配件、冷轧无缝管、内螺纹无缝钢管、冷拔无缝钢管、防腐蚀特种钢管、合金管、锅炉管、轴承管等、建筑钢管、复合管、复合钢管、导线管、螺纹钢管焊接钢管、热镀锌钢管、电镀锌钢管、KBG线路导管、供水管等；。。

The plastic deformation mechanism of the process is explained. The vector equations of the curved conical surface and the figure of the particle motion for the forming process of the bending tube are presented. The theoretical model of stress and strain fields of the forming process is deduced. The practical forming process of tubes of large diameter demonstrates the validity of the new type of design method of the ox-horned core bar and the computation formula of the length of the raw tube.

本文通过研究弯管成形瞬时应力、应变状态及演化过程，阐明了弯管成形过程受力变形特点及力学原理；提出了一种适合弯管变形分析的新单元及数值方法；建立了弯管成形过程应力、应变场&标准图象&；通过研究弯管成形过程金属流动规律及力学条件，阐明了本工艺塑性变形机理；建立了描述弯管成形过程的曲锥面向量方程及其质点运动学图象；推导了弯管成形过程应力、应变场理论模型；结合大口径弯管生产过程，验证了本文给出的新型牛角芯棒设计方法和管坯长度计算公式的正确性。

Main PPR, ABS, PEX Pipe Production Line, PVC, HDPE gas pipe production line, large-caliber hollow-wall winding pipe production line, silicon core pipe production line, steel-plastic composite, medical tube, nylon tube production line, PVC foam core pipe, with spiral pipe production line, posts and telecommunications perforated pipe production line, double-wall corrugated pipe, spiral pipe production line, peroxides, cross-linked polyethylene, pipe production lines, two-pipe extrusion production line, plastic board material production line, plastic foam picture frame-type material production line, SJYF plastic profile extrusion production lines, blow molding Blow Molding Machines, Single Screw eager, cold-cut granulator unit, with the parallel twin-screw extruder, SJSZ conical twin-screw plastic extruder, SJ single screw extruder, SRL-Z series mixing unit, SHR series high speed mixer, auxiliary products sold nationwide and exported to Southeast Asia more than 10 countries and regions.

主要有PPR、ABS、PEX管材生产线、PVC、HDPE燃气管生产线、大口径中空壁缠绕管生产线、硅芯管生产线、、钢塑复合、医用管、尼龙管生产线、PVC芯层发泡管、内螺旋管生产线、邮电通讯多孔管生产线、双壁波纹管、螺旋管生产线、过氧化物、交联聚乙烯、管材生产线、双管挤出生产线、塑料板材生产线、塑料发泡镜框型材生产线、SJYF塑料挤出异型材生产线、吹塑中空成型机、单螺杆热切、冷切造粒机组、同向平行双螺杆挤出机、SJSZ锥形双螺杆塑料挤出机、SJ单螺杆挤出机、SRL-Z系列混合机组、SHR系列高速混合机、辅机系列产品畅销全国并出口东南亚等十多个国家和地区。

objective to evaluate clinical effect of the handling protaper nickel-titanium rotary instruments in preparation of canals of posterior teeth.methods 96teeth with pulpitis or periapical periodontitis were instrumented by handling protaper rotary instruments using step-down technique,and by k files using step-back technique for control.all teeth were obturated with lateral condensation methods.the efficiency of preparation was analyzed with ra-diographs before and after operation.results no transportation,apical blockage and ledge were found in test.the technique could keep canals smooth.there were two ledge,one instrument fracture and nine transportation in control.the operative time was shorter and post treatment pain seldom occurred in handling protaper group.conclusion the handling protaper niti rotary instruments can prepare the canals effectively and safety.after the preparation,the canals could be easily washed,sterilized and filled.it is an efficient instrumentation method for posterior teeth's canals and be used widely.

目的 评价手用protaper预备后牙根管的临床效果。方法选取患有牙髓炎和根尖周炎的后牙96例，随机分成试验组和对照组各48例，试验组用手用protaper多锥度镍钛旋转器械逐步伸入法预备根管，对照组用k锉，逐步后退法预备根管，两组均用侧向加压充填法充填根管，根据治疗前后的x线片，评价后牙根管预备效果。结果试验组无根管偏移、根尖阻塞、台阶，且根管壁平滑流畅，无器械折断等并发症发生。对照组有2例台阶形成，器械折断1例，根管偏移9例。试验组操作时间短且术后疼痛轻微。结论应用手用protaper预备后牙根管快速、安全，成形效果好，易于根管冲洗消毒及填充，可视为临床上预备后牙根管的有效方法。

On closer examination, though, this is not a vote for multilateralism but just the opposite.

仔细审视后我们发现，这并非是对多边主义投出的赞成票，而是恰好相反。

Uncovering their weak spots, so I can defeat them.

揭露出他们的弱点，这样我就可以打败他们了。