Clinical observation on prognosis of mixed hemorrhoids treated with polidocanol injection combined with automatic elastic thread ligation operation

BACKGROUND A total of 100 patients diagnosed with mixed hemorrhoids from October 2022 to September 2023 in our hospital were randomly divided into groups by dice rolling and compared with the efficacy of different treatment options.AIM To analyze the clinical effect and prognosis of mixed hemorrhoids treated with polidocanol injection combined with automatic elastic thread ligation operation(RPH).METHODS A total of 100 patients with mixed hemorrhoids who visited our hospital from October 2022 to September 2023 were selected and randomly divided into the control group(n=50)and the treatment group(n=50)by rolling the dice.The procedure for prolapse and hemorrhoids(PPH)was adopted in the control group,while polidocanol foam injection+RPH was adopted in the treatment group.The therapeutic effects,operation time,wound healing time,hospital stay,pain situation(24 hours post-operative pain score,first defecation pain score),quality of life(QOL),incidence of complications(post-operative hemorrhage,edema,infection),incidence of anal stenosis 3 months post-operatively and recurrence rate 1 year post-operatively of the two groups were compared.RESULTS Compared with the control group,the total effective rate of treatment group was higher,and the difference was significant(P<0.05).The operation time/wound healing time/hospital stay in the treatment group were shorter than those in the control group(P<0.05).The pain scores at 24 hours after operation/first defecation pain score of the treatment group was significantly lower than those in the control group(P<0.05).After surgery,the QOL scores of the two groups decreased,with the treatment group having higher scores than that of the control group(P<0.05).Compared with the control group,the incidence of postoperative complications in the treatment group was lower,and the difference was significant(P<0.05);However,there was no significant difference in the incidence of postoperative bleeding between the two groups(P>0.05);There was no significant difference in the incidence of anal stenosis 3 months after operation and the recurrence rate 1 year after operation between the two groups(P>0.05).CONCLUSION For patients with mixed hemorrhoids,the therapeutic effect achieved by using polidocanol injection combined with RPH was better.The wounds of the patients healed faster,the postoperative pain was milder,QOL improved,and the incidence of complications was lower,and the short-term and long-term prognosis was good.

Automatic Recognition and Construction of Draft Angle for Injection Mold Design

In the injection molding process, plastic products are difficult to demold due to friction force between the cavity and products, thus, finished products might be deformed or damaged. Therefore, designers should add a draft angle to the geometric surface of products, which is parallel to the unloading direction, in order to help the products eject smoothly from the cavity. This study uses CAD software as the main architecture to develop the function of automatic draft angle recognition and construction. The study is divided into three stages. First, the geometric features of products are identified in the CAD model by induced algorithm, then the quilts to be added in the draft design are determined and classified. Finally, draft angles are created in different ways according to different surfaces. An algorithm suitable for automatic draft recognition and construction, as well as the constraints of automatic creation of draft angle, is proposed. The feature recognition algorithm of this study can automatically inspect 90% of the surfaces to be drafted, and the automatic creation of draft features can economize 80% of required mouse clicks, thus, effectively increasing draft angle design efficiency, and preventing errors in mold design and manufacturing.

Control effect of boring pests on fruit trees by high-pressure injection of pesticides

This research is to control the pests inside fruits and buds by injecting pesticides into the tree with the high-pressure injector. The soluable pesticides injected into the trunk can transported insides to every part of the tree to kill pests. The change of pesticides inside the tree was observed. The result showed that injecting pesticides once a year could kill above 80% of the pests which happened once annually. The effect of injection lasts longer than that of applying the pesticide outside. The pesticides injected into the tree are not affected by environment and do not kill natural enemies directly,and the residual amount of pesticides is below the international standard level.

Development and Application of a Surface High-pressure Injection Device Using a Submersible Electric Pump

Injection recovery is an important measure for increasing the oil recovery rate of an oil field. One way is that centrifugal pumps or plunger pumps are used in an injection station to responsible for injection over a large area under the same pressure. This method is ineffective for low-permeability layers. For the oilfields in dispersed distribution in the marginal areas of Daqing, the low water-absorbing section needs an injection with a high delivery pressure and a low discharge capacity; another way is to install the submersible electric pump upside down, but because the submersible electric pump and the motor are underground, it is difficult for installation and maintenance. Introduced in this paper is the development and application of a surface high-pressure injection device with a submersible electric pump. Bysuccessful resolving some problems, such as the axial force of the submersible electric pump, sealing, level regulation of the pump, coaxiality and vibration, the device has the good points of running smoothly, moving easily, installation and maintains quickly and long period of running. This device can effectively solve the injection of the low water-absorbing section and of oilfields in dispersed locations. The recovery rate of oilfields is also enhanced.

Characteristics of High-Pressure Spray of a Gasoline Direct Injection Injector Under Non-Flash Boiling and Flash Boiling Conditions

The increasingly stringent emission regulations and fuel consumption requirements have elevated the demands of internal combustion engines with higher fuel efficiency and lower emissions.It has been widely demonstrated that fash boiling spray can generate shorter and wider spray with improved atomization and evaporation to promote a better air-fuel mixing process.In this study,macroscopic(far-field)spray morphologies and primary breakup(near-field)characteristics of a two-hole gasoline direct injection injector are investigated under non-flash boiling and flash boiling conditions.High speed macroscopic and microscopic imaging was used to capture the overall spray structure and near-field characteristics,respectively.N-Hexane is used as the test fuel with the injection pressure ranging from 10 MPa up to 40 MPa.For sub-cooled liquid fuel sprays,increasing fuel pressure contributes to enhanced fuel atomization and evaporation.Evident collapses occurred under fare flash boiling conditions,and higher injection pressure weakened this phenomenon since the spray cone angle decreased due to a higher injection velocity.

High-pressure capacity expansion and water injection mechanism and indicator curve model for fractured-vuggy carbonate reservoirs

Water injection for oil displacement is one of the most effective ways to develop fractured-vuggy carbonate reservoirs.With the increase in the number of rounds of water injection,the development effect gradually fails.The emergence of high-pressure capacity expansion and water injection technology allows increased production from old wells.Although high-pressure capacity expansion and water injection technology has been implemented in practice for nearly 10 years in fractured-vuggy reservoirs,its mechanism remains unclear,and the water injection curve is not apparent.In the past,evaluating its effect could only be done by measuring the injection-production volume.In this study,we analyze the mechanism of high-pressure capacity expansion and water injection.We propose a fluid exchange index for high-pressure capacity expansion and water injection and establish a discrete model suitable for high-pressure capacity expansion and water injection curves in fractured-vuggy reservoirs.We propose the following mechanisms:replenishing energy,increasing energy,replacing energy,and releasing energy.The above mechanisms can be identified by the high-pressure capacity expansion and water injection curve of the well HA6X in the Halahatang Oilfield in the Tarim Basin.By solving the basic model,the relative errors of Reservoirs I and II are found to be 1.9%and 1.5%,respectively,and the application of field examples demonstrates that our proposed high-pressure capacity expansion and water injection indicator curve is reasonable and reliable.This research can provide theoretical support for high-pressure capacity expansion and water injection technology in fracture-vuggy carbonate reservoirs.

内牙水管接头的注塑模具设计及CAE仿真

针对一端带有内螺纹和另一端为光孔的水管接头,设计了一套带有齿轮传动+抽芯液压缸的自动脱螺纹机构和斜导柱侧抽芯机构的三板式注塑模具。首先,结合塑件的结构特点,确定了点浇口进胶以及浇口位置和直流循环式的冷却回路,利用模流仿真分析软件moldflow对确定的模流分析模型进行注塑成型工艺过程模拟分析。结果表明,塑料熔体的充填时间、缩痕指数、气穴分布以及翘曲变形量等成型工艺参数都在合理范围之内,验证了浇注系统和冷却系统设计的合理性。其次,对模具结构进行设计,将主分型面取在塑件的轴心面上,其余两个分型面顺序分型实现浇注系统凝料的自动脱落。由于塑件为带内螺纹的管状零件,针对内螺纹脱模难的问题,设计了齿轮传动机构驱动螺纹侧型芯旋转和抽芯液压缸的直线移动的两套运动机构实施自动脱螺纹,塑件光孔部分的成型和抽芯采用斜导柱侧抽芯机构来实现。通过模流分析,验证了模具结构的合理性,并且缩短了模具设计的开发周期,有效地提高了塑件的成型质量。

草鱼疫苗连续自动注射装置设计与试验

草鱼疫苗注射主要依靠人工注射,具有劳动强度大、注射效率低、注射位置非标准化和注射精准度差等缺点,严重制约水产养殖的发展。根据草鱼疫苗注射特点,制定了疫苗自动注射作业策略,通过开展鱼苗姿态自动识别与快速调整、注射工位自动分配、鱼体输送与拨杆LS-DYNA动力学仿真分析、鱼体柔性固定与快速注射等技术研究,研制了疫苗自动注射样机,以100~120 mm长的草鱼鱼苗为自动注射对象进行试验。结果显示:草鱼疫苗自动注射装置产量约为900尾/h,试验鱼苗注射疫苗后3周内的存活率达到98.3%,存活率较人工疫苗注射提高4个百分点。该装置实现了草鱼幼苗的高效连续注射,提高了水产养殖装备自动化水平,对纺锤形鱼幼苗的连续注射均具有参考意义,具有较高应用价值与经济效益。

基于PLC的油田注水全自动监控模型构建

油田注水全自动监控能够减少能耗,为实现油田注水全自动监控,构建一种基于PLC的油田注水全自动监控模型。首先设定监测目标,将注水量、供水量、注水井压力和注水井总流量作为约束条件,并建立基于油压、套压、注水水质、注水量、注水温度等预警指标,采用PID与PLC结合的方法实现油田注水全自动监控。实验结果表明,所提油田注水全自动监控模型在注水量监控、缓存罐液位监测、回水管路液体压力、油压监测等方面具有较高的准确性,能够满足方法设计需求,具有一定应用价值。

化学驱集约化配注关键装备开发与应用

胜利油田化学驱地面配注技术自1991年以来,以先导试验技术设备为起点,历经国产化与部分单项技术研发应用。特别是近几年贯彻“绿色企业发展”理念,按照“模块化、标准化、自动化、撬块化”目标,研发自干粉储运、母液配制熟化至增压混配注入的关键装备,形成全程隔氧保黏、全程自动控制、母液熟化程度可控的化学驱集约化配注工艺,为化学驱项目高效安全开发提供了技术支撑和解决方案。

油田注水管道全位置自动焊接技术研究

针对油田注水管道手工焊接存在劳动强度高、效率低、成本高、焊接质量难以保证等难题,研发了注水管道全位置自动焊接技术,根据不同的保护气体配比80%Ar+20%CO_(2)、100%CO_(2),对焊材进行选型匹配,进行了2组试件焊接工艺评定试验。结果表明:2组试验焊缝表面外观检查和无损检测均合格,拉伸、弯曲均符合标准规范要求。根据施工现场环境、焊接操作性、焊接成型质量等综合因素考虑,确定了合理的焊接工艺,并在多项工程应用,焊接外观及成型质量好,焊接一次合格率高。

一种针对FPGA位流的自动化故障注入分析方法

理论上通过篡改FPGA位流,利用其实现的密码算法的错误输出可以分析出密钥,但这种攻击通常需要非常了解目标FPGA的内部结构与位流的对应关系。而位流逆向的难度很大,导致此类攻击的实用性不高。文章提出一种针对FPGA位流的自动化故障注入分析方法,不需要逆向位流,结合张帆等人提出的持久性故障分析理论,把因篡改算法常量导致的出错结果作为可利用的故障。并首次在Xilinx-7系列FPGA开发板上利用Spider进行电压故障注入实验,480条错误密文就可以得到AES-128的密钥,且在10 min内可以完成数据的采集和分析。对于加密位流的情况,可以先利用电磁侧信道分析方法得到明文位流,再结合该文的分析方法来进行密钥破解。

射流无针注射器发展现状与展望

射流无针注射器是指通过特定的装置,使药液形成微小的高速射流来穿透人体皮肤,从而实现不借助针筒来向人体内输送药物的一种医疗仪器。在过去的几十年中,射流无针注射器随着医疗卫生体系的发展和相关技术的进步而不断产生变革。该文介绍了射流无针注射器的发展历程、研究现状和临床应用,简要概述了不同驱动方式的射流无针注射器的原理,并对其各自的优势与存在的问题进行了总结。结合当下的研究现状与临床应用情况分析了射流无针注射器发展所面临的技术难题。在目前医疗设备朝智能化、自动化发展的背景下,展望了射流无针注射器未来的发展和机遇。

基于真实世界数据的注射用尖吻蝮蛇血凝酶儿童用药安全性评价

目的基于医疗机构真实世界数据,运用单臂观察性研究的方法评价注射用尖吻蝮蛇血凝酶在儿童中使用的安全性,为该药的安全使用和风险管控提供参考。方法构建儿童用药真实世界数据库,利用大数据人工智能挖掘技术,建立药品不良反应自动监测模型,监测2014年2月25日至2021年1月28日首都儿科研究所附属儿童医院使用注射用尖吻蝮蛇血凝酶的住院儿童电子病历,系统报警病例经人工评价并汇总统计,获得药品不良反应的发生情况,并分析可能影响用药安全性的因素。结果纳入研究的患者共35720例,注射用尖吻蝮蛇血凝酶所致皮疹、呕吐、头痛、过敏性休克的药品不良反应发生率分别为0.008%、0.003%、0.003%、0.003%,未见新的药品不良反应,在临床实践中用药天数、给药方式、单次给药剂量的合理选择有助于降低药品不良反应的发生率。结论利用计算机辅助药品安全性评价,基于医疗机构真实世界数据获得了注射用尖吻蝮蛇血凝酶的儿童用药安全性情况,各不良反应均较为罕见,药品在整体上具有较好的安全性。

基于新型BIST的LUT测试方法研究

针对FPGA内部的LUT资源覆盖测试,提出一种新型BIST的测试方法。通过改进的LFSR实现了全地址的伪随机向量输入,利用构造的黄金模块电路与被测模块进行输出比较,实现对被测模块功能的快速测试,并在Vivado 2018.3中完成了仿真测试。通过ATE测试平台,加载设计的BIST测试向量,验证结果与仿真完全一致,仅2次配置即可实现LUT的100%覆盖率测试。此外,还构建了LUT故障注入模拟电路,人为控制被测模块的输入故障,通过新型BIST的测试方法有效诊断出被测模块功能异常,实现了准确识别。以上结果表明,该方法不仅降低了测试配置次数,而且能够准确识别LUT功能故障,适用于大规模量产测试。

自动替换镶件的双色注塑模具设计

在双色注塑成型过程中,第一射成型的基体塑件滞留于子动模侧,并随子动模移动至第二射子定模处合模后完成第二射包胶成型。为解决在基体塑件背面(与动模型腔接触的面)进行第二射包胶问题,必须更换子动模相应部位的镶件;为此,通过控制模具开合模动作顺序,利用固定在第一射子定模侧的弯销带动动模滑块及镶件一起移动,实现第一射与第二射不同镶件之间的替换动作,再利用限位块、回位弹簧控制镶件伸出及回位。为防止开模时基体塑件粘附子定模型腔,在第一射的子定模侧设计了以氮气弹簧为主动力的顶出基体塑件机构。为保证自动替换镶件、顶出等机构安全、准确可靠地运行,设计了相应的保障机构。

全自动流动注射分光光度法测定锰厂排放水中的总氮

探讨了全自动流动注射分光光度法测定锰厂排放水质总氮含量的方法.在0~6.000 mg·L^(-1)浓度范围内呈线性关系,其回归方程为y=134.86x+116.7,相关系数R达到1.000 0,方法检出限为0.006 7 mg·L^(-1),加标回收率在98.6%~109%之间,实验结果表明线性关系良好,方法准确可靠.并采用全自动流动注射分光光度法和碱性过硫酸钾消解-紫外分光光度法对质控样品进行了对比测试,两种方法测定结果无显著差异,测定值均在标准值范围内.该法应用于电解锰厂排放废水水质总氮测定,具有操作简单、测试快速、准确度高、精密度好、检出限低的优点,能快速完成大批量样品测定.

一种便携式气体自动进样装置的研制及性能验证

根据JJG 700-2016《气相色谱仪检定规程》对火焰离子化检测器(FID)和热导检测器(TCD)的检校要求,设计并研制一种便携式气体自动进样装置。该装置可实施气体的连续自动进样,进样体积范围覆盖(0.1~5.0)mL,且性能验证实验测得的连续7次峰面积重复性(RSD)为0.9%。同时,装置自身的稳定性和操作的便利性,能有效提高气相色谱仪的计量质量和效率。

自动弹力线痔疮套扎器联合硬化剂注射治疗女性混合痔的临床效果

目的探讨自动弹力线痔疮套扎器联合硬化剂注射治疗女性混合痔的临床效果。方法选取2021年6月至2023年6月兴义市人民医院收治的235例混合痔女性患者,采用随机数字表法分为对照组(117例)和观察组(118例)。对照组采用传统外剥内扎术治疗,观察组采用自动弹力线痔疮套扎器联合硬化剂注射治疗,比较两组治疗效果、术后并发症发生情况。结果观察组治疗总有效率高于对照组(P<0.05);观察组术后并发症总发生率低于对照组(P<0.05)。结论女性混合痔患者采用自动弹力线痔疮套扎器联合硬化剂注射治疗效果较好,可提升治疗有效率,降低术后并发症发生率。

EDTA-2Na-磷酸蒸馏-全自动流动注射分析仪联用测定高粱、大曲、酒醅中氰化物含量

该实验采用乙二胺四乙酸二钠(EDTA-2Na)-磷酸(2 g-5 m L)蒸馏体系对高粱、大曲、酒醅中的氰化物进行蒸馏提取,并结合全自动流动注射分析技术建立了高粱、大曲、酒醅中氰化物的快速测定方法。结果表明,氰化物在5~200μg/L范围内具有良好的线性关系(R2=0.999 6),检出限(LOD)为8.10μg/kg,定量限(LOQ)为25.00μg/kg;精密度、重复性、稳定性均良好,相对标准偏差(RSD)均<10%;样品的加标回收率为82.23%~97.64%。该检测技术前处理简便,检测效率较高,定量结果准确可靠,适用于大批量高粱、大曲、酒醅样品中氰化物的检测分析,对于提升白酒的质量安全监测能力具有重要的实际意义。