氨酸法工艺在复合肥料生产中的应用

介绍氨酸法工艺用于复合肥料生产的发展进程及其特点,比较了氨酸法管式反应器工艺与氨酸法料床直接反应工艺的优缺点.进行了初步的技术经济比较.氨酸法工艺用于传统团粒法生产装置的改造切实可行.     

Skin exposure to epoxy in the pipe relining trade - an observational study

Background. Epoxy resin systems (ERSs) are frequent causes of occupational allergic contact dermatitis. Epoxy pipe relining has become a widely used alternative to replacing old and worn drain pipes in housing, and involves a high risk of skin exposure to ERSs. Objectives. To map out work methods, protective measures and skin and surface contamination among workers involved in epoxy pipe relining, as a basis for prevention of occupational skin disease. Methods. Twenty‐one employees in eight relining companies in Stockholm County were observed. Contact and contamination with ERSs and the use of personal protective equipment during relining work were noted. Results. Contamination by uncured ERSs on gloves, personal and shared tools and work areas was identified during mixing, wetting, installation, and cleaning. The gloves used were often inadequate for handling ERSs. Conclusions. Relining pipes poses an extensive risk of uncured ERS exposure, and contamination was identified during the whole work process. Shared and personal tools and work areas were extensively contaminated. Changes in work routines and logistics for handling ERSs are essential, and knowledge among both employers and employees regarding the risks caused by ERS exposure is vital to create a safe work environment and prevent contact allergies.     

Epoxy pipe relining - an emerging contact allergy risk for workers

Background. Epoxy pipe relining is a method of repairing old and worn water pipes supplying households. The method, using epoxy resin systems (ERSs), involves creating a new pipe inside an existing pipe. Large amounts of epoxy are normally handled at small, temporary worksites. Objectives. To describe working conditions and contact allergies to ERSs in 8 patients with occupational contact dermatitis related to their work in the relining trade. Methods. Eight patients with suspected work‐related eczema in the relining trade were referred to our Occupational and Environmental Dermatology outpatient unit. They were examined and patch‐tested between August 2010 and May 2011. Results. Seven patients were patch test‐positive to ERSs, and 6 of 8 reacted to the epoxy resin (MW 340) in the baseline series. Five of the patients were patch test‐positive to their own work products. Seven of the cases had to leave the relining trade because of skin problems. Conclusions. Relining is a widely used alternative to replacing old pipes, and entails a risk of massive skin exposure to ERSs and consequently a high risk of developing allergic contact dermatitis. Further mapping of working methods and use of personal protective equipment (PPE) is crucial to reduce hazardous skin exposure.     

颈内静脉与股静脉临时置管在血液透析中应用的比较

目的比较颈内静脉及股静脉临时置管在血液透析中的应用。方法将124例中心静脉临时置管后血液透析的患者分为两组,其中股静脉置管组76例,颈内静脉置管组48例,观察两组患者导管留置时间、导管使用次数、透析血流量、Kt/v、并发症等指标。结果颈内静脉置管组导管留置时间、导管使用次数、透析血流量、Kt/v分别为（41.81±10.96）d、（17.17±4.83）次、（230.94±20.33）mL/min及1.48±0.16,显著高于股静脉置管组的（27.09±9.77）d、（10.46±4.13）次、（215.46±28.07）mL/min及1.18±0.22,差异有统计学意义。股静脉置管组感染、栓塞及穿刺并发症分别为34.2%、26.3%及18.4%,显著高于颈内静脉置管组的8.3%、6.3%及10.4%。结论对比而言,颈内静脉置管是一种更为理想的血液透析临时血管通路。     

乳磨牙根尖周炎空管药物疗法106例疗效观察

目的:观察空管药物治疗乳磨牙急慢性根尖周炎的临床疗效。方法:临床随机选择106例乳磨牙急慢性根尖周炎的患牙,清理根管无症状后,将自制空管药物盖在根管口,常规垫底永久充填。结果:106颗乳磨牙治疗成功85颗(80.2%),好转14颗(13.2%),失败7颗(6.6%)。结论:本方法是治疗急慢性根尖周病的有效方法。     

简易垃圾堆填场治理技术探讨

通过青岛市太原路垃圾转运站（太原路垃圾场上）场地治理工程实例,分析了简易垃圾堆填场场地治理中需要考虑的问题,探讨了简易垃圾场快速转化为建设用地的治理技术。     

Test and Finite Element Analysis of a New Type of Double-Limb Double-Plate Connection Joint in Narrow Base Tower

The connection between the leg members and diagonal members of the urban transmission line tower is mostly in the form of single-limb connection. This paper puts forward a new connection form of pipe double-limb double-plate connection joint, which is based on the model of key joints in an urban narrow base tower structure. The traditional pipe single-limb single-plate and new pipe double-limb double-plate joint are analyzed and studied from three aspects of theory, numerical simulation and experimental study. Through finite element analysis, it is obtained that the section stress of angle steel under eccentric load is 2.05 times of that under axial load, which is basically consistent with the 2.5 times of the theoretical calculation. This shows that the stress of the angle steel in the pipe double-limb double-plate joint is greatly reduced as the axial stress component, which can ensure the safety of the angle steel. Based on the theoretical analysis of the tensile force of two kinds of joints, through the test research and corresponding numerical simulation of pipe single-limb single-plate and pipe double-limb double-plate joints, under the same load, compared with pipe single-limb single-plate joints, the pipe double-limb double-plate joints designed in this paper can greatly reduce the stress of connection plates and members, and compared with the existing joint forms, the bending stress of joint plates can be reduced by about four times, which greatly improves the bearing capacity of the joint. The research on the pipe double-limb double-plate connection joint will provide the basis for the design of new connection joints of narrow base towers in urban areas.     

塑料管扩张上颌窦口在鼻内窥镜术后的应用

目的：探讨鼻内窥镜术后用塑料管扩张上颌窦口避免上颌窦口闭塞及术腔黏连的临床效果。方法：为106例、190侧慢性鼻窦炎、鼻息肉患者在鼻内窥镜术后应用塑料管扩张上颌窦口。结果：随访12个月以上,根据内窥镜鼻窦手术疗效评定标准（1997,海口）,治愈率为87．9％（167／190）,好转率为12．1％（32／190）。无1例术腔黏连及上颌窦口闭塞。结论：鼻内窥镜术后用塑料管扩张上颌窦口方法简便,效果满意,可作为常规方法应用。     

Thermal Characterization of Medium-Temperature Phase Change Materials (PCMs) for Thermal Energy Storage Using the T-History Method

To reduce energy consumption and increase energy efficiency in the building sector, thermal energy storage with phase change materials (PCMs) is used. The knowledge of the thermophysical properties and the characteristics of PCMs (like their enthalpy changes and the distribution of stored energy over a specified temperature range) is essential for proper selection of the PCM and optimal design of the latent thermal energy store (LHTES). This paper presents experimental tests of the thermophysical properties of three medium-temperature PCMs: OM65, OM55, RT55, which can be used in domestic hot water installations and heating systems. Self-made test chambers with temperature control using Peltier cells were used to perform measurements according to the T-history method. In this way the temperature range of the phase transition, latent heat, specific heat capacity, enthalpy and the distributions of stored energy of the three PCMs were determined. The paper also presents measurements of the thermal conductivity of these PCMs in liquid and solid state using a self-made pipe Poensgen apparatus. The presented experimental tests results are in good agreement with the manufacturers’ data and the results of other researchers obtained with the use of specialized instruments. The presented research results are intended to help designers in the selection of the right PCM for the future LHTES co-working with renewable energy systems, waste heat recovery systems and building heating systems.     

肝癌介入术后随访的影像学比较

经导管肝动脉化疗栓塞术（TACE）治疗肝细胞癌（HCC）已有30年历史,1979年开始用碘化油栓塞治疗肝癌并逐渐应用于临床,现已成为HCC非手术治疗的有效和首选方法。其基本原理：肝细胞癌的血供主要来自肝动脉,尤其是有包膜的肝细胞癌,经导管自肝动脉注入化疗药物的杀伤作用与药物的浓度及与癌细胞的接触时间成正比,肝动脉灌注化疗可明显提高抗癌药物的杀伤作用,减少副反应。将提供肿瘤营养的肝动脉支栓塞,使肿瘤缺血坏死。灌注化疗与碘油栓塞并用可增加化疗药物与癌肿的接触时间,最终达到肿瘤缩小,控制肿瘤生长的目的。