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New shakedown criterion and permanent deformation properties of unbound granular materials 预览
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作者 Ali Alnedawi Kali Prasad Nepal Riyadh Al-Ameri 《现代交通学报:英文版》 2019年第2期108-119,共12页
Unbound granular material specifications for road pavements in Australia are primarily based on physical material specification rather than mechanical characterisation. This simplified approach does not reflect the ac... Unbound granular material specifications for road pavements in Australia are primarily based on physical material specification rather than mechanical characterisation. This simplified approach does not reflect the actual material performance under repeated dynamic traffic loads. There is a little information available on the influence of the local crushed rock properties and compacted layer properties on permanent deformation (PD). This study aims to characterise the local unbound granular materials in Victoria according to their PD behaviour under repeated loads and to develop a suitable shakedown criterion that could describe the PD of the tested materials to simplify the flexible pavement design. Repeated-load triaxial tests were conducted over several samples with a range of moisture contents, gradations, densities, and stress conditions. The laboratory test results showed that PD behaviour was influenced by several factors. In addition, the tested subbase-specified unbound granular materials reflect high PD resistance that is almost equivalent to basequality unbound granular materials. This may indicate that current requirements for the subbase-quality unbound granular materials are over-prescribe. Moreover, as the existing shakedown criterion was not applicable for the multi-stage repeated-load triaxial test and the local tested materials, a new shakedown criterion and new boundaries are proposed based on the PD behaviour. In the proposed criterion, the shakedown ranges are identified based on the curve angle of the PD vs. logarithm of the number of loading cycles, and this new criterion was validated using several materials from existing literature. The local tested base and subbase materials can be assigned as Range A when PD\1%, Range B when 1%\PD\3%, and Range C when PD[3%. The proposed criterion could provide a useful and quick approach to assess the PD of the unbound granular materials with both single and multistages of stresses. 展开更多
关键词 Flexible PAVEMENT Unbound GRANULAR materials Repeated load TRIAXIAL test PERMANENT deformation SHAKEDOWN theory
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Roof filling control technology and application to mine roadway damage in small pit goaf 预览
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作者 Weiyi Cai Zechao Chang +3 位作者 Dongsheng Zhang Xufeng Wang Wenhao Cao Yazhou Zhou 《矿业科学技术学报:英文版》 CSCD 2019年第3期477-482,共6页
To recover coal resources that have been damaged by traditional mining methods and ensure stability of the lower roadway in a small pit goaf,the goaf area must be filled and reinforced.In this research,the 1202 workin... To recover coal resources that have been damaged by traditional mining methods and ensure stability of the lower roadway in a small pit goaf,the goaf area must be filled and reinforced.In this research,the 1202 working face of the Hanzui mine is considered as an example for classifying the roof of the mining tunnel under the small kiln destruction zone,the effect of the goaf on the roadway is determined based on the radio tunnel penetration method,a mechanical model to determine the roof filling control mechanism was established,and the duct foaming system and roof filling process were designed.The results show that the scope and degree of influence of the goaf on the mining lane are large,but safe tunneling can be ensured through the use of a steel shed and advanced grouting techniques.When the roof conditions are not similar,materials with different filling heights and filling strengths can be used to control the roof filling of the roadway.By combining field experience and laboratory tests,it was determined that a high-foaming material with a water-cement ratio of 1:0.6,a suitable high-foaming additive,and a water volume ratio of 1:30 is cost-efficient for filling and meets the filling strength requirements.Finally,the reliability of the proposed technology was verified by field experiments,which provide a reference for filling operations in similar mines. 展开更多
关键词 Repeated MINING ROADWAY ROOF control High foam material FILLING MINING
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Effect of vertical stress rest period on deformation behaviour of unbound granular materials:Experimental and numerical investigations 预览
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作者 Ali Alnedawi Kali Prasad Nepal +1 位作者 Riyadh Al-Ameri Mohanad Alabdullah 《岩石力学与岩土工程学报:英文版》 CSCD 2019年第1期172-180,共9页
Repeated load triaxial test is used to assess the deformation behaviour of unbound granular materials(UGMs)in flexible road pavements.Repeated load pulse characteristics(i.e.shape,loading period and rest period)are th... Repeated load triaxial test is used to assess the deformation behaviour of unbound granular materials(UGMs)in flexible road pavements.Repeated load pulse characteristics(i.e.shape,loading period and rest period)are the stress configurations used in the experimental set-up to simulate the passing axle loads.Some researchers and standard testing protocols suggest a rest period of varying durations after a loading phase.A thorough review of existing literature and practises has revealed that there is no agreement about the effect of the rest period of vertical stress pulse on the deformation behaviour of the UGMs.Therefore,the main objective of this study is to investigate the effect of repeated stress rest period on the deformation behaviour of UGMs experimentally.Experiments are conducted,both with and without rest period,using basalt and granite crushed rocks from Victoria,Australia.Furthermore,in order to gain insight into the effect of the rest period,finite element modelling is also developed.Both the experimental and modelling results show that the rest period has a noticeable effect on both resilient and permanent deformation behaviours of UGMs.It is,therefore,recommended to take extra precautions while adopting a particular standard testing protocol and to supplement the results by additional tests with different loading configurations. 展开更多
关键词 Flexible PAVEMENT Unbound GRANULAR materials(UGMs) Repeated load TRIAXIAL test Resilient MODULUS PERMANENT deformation Finite element modelling
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Impact of repeated loading on mechanical response of a reinforced sand 预览
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作者 Aida Mehrpazhouh Seyed Naser Moghadas Tafreshi Mehdi Mirzababaei 《岩石力学与岩土工程学报:英文版》 CSCD 2019年第4期804-814,共11页
Pavements constructed over loosely compacted subgrades may not possess adequate California bearing ratio (CBR) to meet the requirements of pavement design codes,which may lead to a thicker pavement design for addressi... Pavements constructed over loosely compacted subgrades may not possess adequate California bearing ratio (CBR) to meet the requirements of pavement design codes,which may lead to a thicker pavement design for addressing the required strength.Geosynthetics have been proven to be effective for mitigating the adverse mechanical behaviors of weak soils as integrated constituents of base and sub-base layers in road construction.This study investigated the behaviors of unreinforced and reinforced sand with nonwoven geotextile using repeated CBR loading test (followed by unloading and reloading).The depth and number of geotextile reinforcement layers,as well as the compaction ratio of the soil above and below the reinforcement layer(s) and the compaction ratio of the sand bed,were set as variables in this context.Geotextile layers were placed at upper thickness ratios of 0.3,0.6 and 0.9 and the lower thickness ratio of 0.3.The compaction ratios of the upper layer and the sand bed varied between 85% and 97% to simulate a dense layer on a medium dense sand bed for all unreinforced and reinforced testing scenarios.Repeated CBR loading tests were conducted to the target loads of 100 kgf,150 kgf,200 kgf and 400 kgf,respectively (1 kgf=9.8 N).The results indicated that placing one layer of reinforcement with an upper thickness ratio of 0.3 and compacting the soil above the reinforcement to compaction ratio of 97% significantly reduced the penetration of the CBR piston for all target repeated load levels.However,using two layers of reinforcement sandwiched between two dense soil layers with a compaction ratio of 97% with upper and lower thickness ratios of 0.3 resulted in the lowest penetration. 展开更多
关键词 GEOSYNTHETICS GEOTEXTILE Reinforced soil California bearing ratio (CBR) ELASTIC behavior Repeated loading DENSE SAND Medium DENSE SAND
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On a Certain Method of Rejecting Games With Too Much Risk and Not Enough Expected Gain 预览
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作者 Ewa Drabik 《经济世界:英文版》 2018年第6期487-496,共10页
Many important economic decisions involve an element of risk.Risk aversion is a concept in economics,game theory,finance,and psychology related to the behavior of consumers,players,and investors under uncertainty.Loss... Many important economic decisions involve an element of risk.Risk aversion is a concept in economics,game theory,finance,and psychology related to the behavior of consumers,players,and investors under uncertainty.Loss aversion is an important component of a phenomenon that has been widely discussed in recent years.It refers to a tendency to feel the pain of a loss more acutely than the pleasure of an equal-sized gain.Many scientists have analyzed the problem of profitability in games.Some authors presented certain features which characterize“safe”games played once.Kahneman and Tversky(1991)showed that the ratio of loss aversion to gain attraction should amount to 1:2.The aim of this paper is to show an asymptotically efficient strategy which enables the risk-averse player to establish boundary variables of loss and gain at each stage of a repeated game. 展开更多
关键词 ASYMPTOTICALLY efficient adaptive allocation rule one-armed BANDIT problem RISK AVERSION repeated GAMES
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某地区流动人口女性重复人工流产、避孕状况及服务需求研究 预览
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作者 杨婷 王旭 +2 位作者 周燕 龙春燕 曹莉 《中国卫生标准管理》 2018年第10期37-39,共3页
目的探讨乌鲁木齐市地区流动人口女性重复人工流产、避孕状况及服务需求。方法采用普查法对2016年12月—2017年12月我院收治的420例流动人口人工流产患者作为研究对象,其中筛查出208例为重复人工流产患者,对其进行问卷调查。分析其避孕... 目的探讨乌鲁木齐市地区流动人口女性重复人工流产、避孕状况及服务需求。方法采用普查法对2016年12月—2017年12月我院收治的420例流动人口人工流产患者作为研究对象,其中筛查出208例为重复人工流产患者,对其进行问卷调查。分析其避孕状况、服务需求情况。结果 420例流动人口女性中,出现重复人工流产208例,发生率为49.5%;流产次数为2~5次,平均(2.54±0.86)次;与上次流产间隔时间3~13个月,平均(9.68±0.73)个月;妊娠的原因:避孕失败47例,未行避孕95例,避孕套破裂25例,其他41例;以避孕套为主要避孕措施,占80.8%;避孕措施以偶尔使用为主,占53.8%;配偶避孕态度以积极为主,占66.3%;避孕知识需求程度以需要为主,占80.3%;避孕咨询需求占比为80.7%;避孕知识获取途径以医务人员为主,占74.0%,宣传材料占比为53.8%。结论本地区重复人工流产状况不容忽视,应加强避孕宣教和认知教育。 展开更多
关键词 流动人口 女性 重复 人工流产 避孕状况 服务需求
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匹多莫德+玉屏风颗粒对小儿反复呼吸道感染患儿肺功能的改善分析 预览
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作者 张慧 《中外医疗》 2018年第35期81-83,共3页
目的观察对反复呼吸道感染患儿采取匹多莫德+玉屏风颗粒同时治疗的效果,及对患儿的肺功能改善情况。方法方便选取该院2017年5月—2018年5月收治的140例反复性呼吸道感染患儿中,匹多莫德治疗的70例作为甲组,匹多莫德+玉屏风颗粒治疗的70... 目的观察对反复呼吸道感染患儿采取匹多莫德+玉屏风颗粒同时治疗的效果,及对患儿的肺功能改善情况。方法方便选取该院2017年5月—2018年5月收治的140例反复性呼吸道感染患儿中,匹多莫德治疗的70例作为甲组,匹多莫德+玉屏风颗粒治疗的70例作为乙组,比较其结果。结果乙组治疗后的IgM、IgA、IgG、CD8+、CD3+、CD4+依次是(1.69±0.31)g/L、(1.52±0.20)g/L、(12.08±2.41)g/L、(18.99±2.03)%、(56.66±5.33)%、(45.45±3.35)%,与甲组的(1.30±0.36)g/L、(1.04±0.25)g/L、(10.01±2.24)g/L、(23.35±1.88)%、(52.33±5.44)%、(38.55±3.39)%比较差异有统计学意义(P<0.05)。乙组治疗后PEF、FEV1、FVC、IL-8、IL-6、TNF-α依次是(3.03±0.32)L/s、(2.75±0.25)L、(3.12±0.15)L、(42.32±11.50)pg/mL、(8.45±2.33)pg/mL、(8.44±2.35)pg/mL,与甲组的(2.40±0.28)L/s、(2.02±0.24)L、(2.50±0.15)L、(56.12±12.35)pg/mL、(11.78±2.79)pg/mL、(13.77±5.75)pg/mL比较差异有统计学意义(P<0.05)。甲组治疗总有效率是78.57%,较乙组的95.71%低,对比差异有统计学意义(χ^2=9.180 3,P<0.05)。结论匹多莫德+玉屏风颗粒治疗小儿反复性呼吸道感染的效果明显。 展开更多
关键词 反复 呼吸道感染 匹多莫德 玉屏风颗粒 治疗疗效
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人工流产术后开展延伸护理对重复人工流产的影响 预览
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作者 严亚萍 《中国继续医学教育》 2018年第10期173-174,共2页
目的探究实施人工流产术后开展延伸护理对重复流产影响。方法选取本院2016年7月—2017年10月我院收入2 000例行人工流产术患者作为本次观察对象。按照临床护理模式不同,将其分为观察组和对照组,每组各1 000例。对照组予以常规护理,观察... 目的探究实施人工流产术后开展延伸护理对重复流产影响。方法选取本院2016年7月—2017年10月我院收入2 000例行人工流产术患者作为本次观察对象。按照临床护理模式不同,将其分为观察组和对照组,每组各1 000例。对照组予以常规护理,观察组在对照组基础上,实施延伸护理,比较两组术后避孕知识掌握情况以及避孕方式比较。结果观察组患者术后1个月、术后3个月、术后6个月避孕知识掌握情况均优于对照组,两组数据对比,差异具有统计学意义(P<0.05);观察组使用避孕套、避孕药人数多于对照组,两组对比,差异具有统计学意义(P<0.05);观察组中使用体外射精、安全期、其他方式的人数多于对照组,两组各数据对比,差异具有统计学意义(P<0.05)。结论对人工流产手术后患者实施有效护理干预,能够提高患者人流知识知晓率,降低临床上人工流产重复率,为女性生殖健康起着重要临床意义。 展开更多
关键词 人工流产术 延伸护理 重复 避孕方式
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Repeated Failure in Reward Pursuit Alters Innate Drosophila Larval Behaviors
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作者 Yue Fei Dikai Zhu +3 位作者 Yixuan Sun Caixia Gong Shenyang Huang Zhefeng Gong 《神经科学通报:英文版》 SCIE CAS CSCD 2018年第6期901-911,共11页
Animals always seek rewards and the related neural basis has been well studied. However, what happens when animals fail to get a reward is largely unknown,although this is commonly seen in behaviors such as predation.... Animals always seek rewards and the related neural basis has been well studied. However, what happens when animals fail to get a reward is largely unknown,although this is commonly seen in behaviors such as predation. Here, we set up a behavioral model of repeated failure in reward pursuit(RFRP) in Drosophila larvae. In this model, the larvae were repeatedly prevented from reaching attractants such as yeast and butyl acetate, before finally abandoning further attempts. After giving up, they usually showed a decreased locomotor speed and impaired performance in light avoidance and sugar preference,which were named as phenotypes of RFRP states. In larvae that had developed RFRP phenotypes, the octopamine concentration was greatly elevated, while tbh mutants devoid of octopamine were less likely to develop RFRP phenotypes, and octopamine feeding efficiently restored such defects. By down-regulating tbh in different groups of neurons and imaging neuronal activity, neurons that regulated the development of RFRP states and the behavioral exhibition of RFRP phenotypes were mapped to a small subgroup of non-glutamatergic and glutamatergic octopaminergic neurons in the central larval brain. Our results establish a model for investigating the effect of depriving an expected reward in Drosophila and provide a simplified framework for the associated neural basis. 展开更多
关键词 DROSOPHILA larva Repeated FAILURE in REWARD pursuit.Octopamine
Mixed PEGylated surfactant modifying system decrease the accelerated blood clearance phenomenon of nanoemulsions in rats 预览
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作者 Yuqing Su Wenya Tang +7 位作者 Yanzhi Song Chunling Wang Qingjing Tian Xuling Wang Jingjing Quan Buoqun Li Shaoning Wang Yihui Deng 《亚洲药物制剂科学(英文)》 2017年第1期28-36,共9页
The accelerated blood clearance(ABC) phenomenon which is induced by repeated injection of poly(ethylene glycol)(PEG)-coated colloidal carriers gives clinical challenge to the promising drug delivery system. It is nece... The accelerated blood clearance(ABC) phenomenon which is induced by repeated injection of poly(ethylene glycol)(PEG)-coated colloidal carriers gives clinical challenge to the promising drug delivery system. It is necessary to decrease this unexpected immunological response.A novel 4-arm poly(ethylene glycol-5000)4-cholesteryl methyl amide(4-arm PEG5000-CHMA)has been synthesized. The structure of 4-arm PEG5000-CHMA was confirmed by IR and 1H-NMR spectrum. The pharmacokinetics of the tocopheryl nicotinate(TN)-loaded nanoemulsions modified with 4-arm PEG5000-CHMA or/and 1, 2-distearoyl-Sn-glycero-3-phosphoethanolamine-n-[methoxy(poly-ethyleneglycol)-2000](mPEG2000-DSPE) have been studied. Furthermore, the ABC phenomenon has been detailed investigated in rats by TN-loaded nanoemulsions modified with 4-arm PEG5000-CHMA and mPEG2000-DSPE(CPNE). The plasma levels of TN and anti-PEG IgM antibody were determined by HPLC and ELISA, respectively.The circulation time of the CPNEs were comparable to the mPEG2000-DSPE coated nanoemulsions. Moreover, the ABC phenomenon can be decreased by CPNEs. This study designs a method to decrease the ABC phenomenon and develops a clinical promising nanoemulsion for therapeutic or imaging purpose. 展开更多
关键词 ACCELERATED blood clearance(ABC) phenomenon Repeated administration 4-arm PEG5000-CHMA Anti-PEG IgM
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Extreme long survival of a patient operated with uterine leiomyosarcoma 预览
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作者 Zsolt Baranyai Valéria Jósa Attila Zaránd 《普通外科》 2017年第1期3-6,共4页
Leiomyosarcomas of the uterus are rare tumours that recur and metastasize early. Adjuvant chemotherapy or postoperative radiotherapy has not been proven effective in treating it. The most successful therapeutic approa... Leiomyosarcomas of the uterus are rare tumours that recur and metastasize early. Adjuvant chemotherapy or postoperative radiotherapy has not been proven effective in treating it. The most successful therapeutic approach seems to be repeated surgical resection and removal of metastases. The authors presented a case of a female who had metastases resections, both from the abdomen and thoracic cavity, for a total of 10 times following hysterectomy due to leiomyosarcoma of the uterus. The patient is still alive 23 years later following the first surgery. 展开更多
关键词 LEIOMYOSARCOMA of the UTERUS repeated RESECTION ADJUVANT chemotherapy ADJUVANT irradiation OOPHORECTOMY pulmonary METASTASES survival
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康复期截瘫患者泌尿系感染反复发作的特点调查分析 被引量:1
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作者 杜小芳 彭文旭 +2 位作者 熊盛杰 李洪 邹再莉 《中华医院感染学杂志》 CAS CSCD 北大核心 2017年第3期593-596,共4页
目的探讨康复期截瘫患者泌尿系感染反复发作的特点,为患者泌尿系感染反复发作的预防治疗提供参考。方法选取医院2015年1月-2016年6月诊治的康复期截瘫泌尿系感染患者100例,对患者相关资料进行调查,分析结果。结果 76例患者为泌尿系感染... 目的探讨康复期截瘫患者泌尿系感染反复发作的特点,为患者泌尿系感染反复发作的预防治疗提供参考。方法选取医院2015年1月-2016年6月诊治的康复期截瘫泌尿系感染患者100例,对患者相关资料进行调查,分析结果。结果 76例患者为泌尿系感染反复发作,占76.00%,24例患者为初次感染,占24.00%;76例泌尿系感染反复发作患者中段尿培养阳性者56例,阳性率为73.68%,培养出菌株61株,其中革兰阴性菌36株、革兰阳性菌21株、支原体与衣原体各2株,分别占59.02%、34.43%、3.28%、3.28%,主要感染病原菌为大肠埃希菌,占检出病原菌的39.34%;不同性别、年龄、截瘫类型及留置尿管方式对泌尿系感染反复发作无影响,泌尿系感染反复发作率完全性截瘫、合并尿路结石时分别为85.96%、100.00%,高于不完全截瘫、未合并尿路结石时62.79%、71.76%,截瘫时间〉2年时为84.78%,高于〈1年、1~2年时45.45%、74.42%,比较差异有统计学意义(P〈0.05)。结论康复期截瘫患者容易出现泌尿系感染反复发作,感染病原菌主要以大肠埃希菌为主的革兰阴性菌,合并有尿路结石、完全性截瘫及截瘫时间长的患者更容易出现泌尿系感染的反复发作是其特点。 展开更多
关键词 截瘫 泌尿系感染 康复期 反复发作
银镧合金重复成型对烧结的影响 预览
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作者 刘涛 张航 +3 位作者 史振琦 王岗 杨威 师阿维 《中国钨业》 北大核心 2017年第4期39-43,共5页
为了研究钼镧合金重复成型对烧结的影响,对钼镧合金的形貌、化学及物理指标进行了测试,结果表明:重复成型与正常成型的钼镧合金烧结后的宏观及微观组织形态没有差异。碾压钼粉与正常钼粉相比,粒度变化不大为3.8um,松比是正常钥粉的... 为了研究钼镧合金重复成型对烧结的影响,对钼镧合金的形貌、化学及物理指标进行了测试,结果表明:重复成型与正常成型的钼镧合金烧结后的宏观及微观组织形态没有差异。碾压钼粉与正常钼粉相比,粒度变化不大为3.8um,松比是正常钥粉的2倍为2.46g/cm3。烧结后,重复成型合金密度为9.76g/cm3,相比正常合金提_了0.16g/dm3e碼压钼粉氧含量是正常钼粉的两倍,其他化学元素含量与正常钼粉基本接近。重复成型合金烧结后的化学元素含量与正常合金无显著差异。 展开更多
关键词 钼镧合金 氧化镧:粉末烧结 重复成型
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对叠框架“X来X去”的语法化和修辞化 被引量:2
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作者 周红 《当代修辞学》 CSSCI 北大核心 2017年第1期24-34,共11页
“X来X去”受“来、去”的往返位移性、“X”的同范畴性以及顺序、次第扫描和数量象似性的认知作用,在惯常性语境的激发下,成为表达反复义的对叠框架,通过不断类推,由修辞化走向语法化,又由语法化再面临修辞化。“X来X去”蕴含动... “X来X去”受“来、去”的往返位移性、“X”的同范畴性以及顺序、次第扫描和数量象似性的认知作用,在惯常性语境的激发下,成为表达反复义的对叠框架,通过不断类推,由修辞化走向语法化,又由语法化再面临修辞化。“X来X去”蕴含动作行为或性质变化的方式特征,具有“耗费较大劳力或心力”的意味。A类用于空间域,是循环反复;B类用于时间域,是持续反复。A类到B类,语篇依附性越来越强,“来/去”由位移动词虚化为趋向动词、准动态助词,“X”由顺序/位移特征扩展至非顺序/非位移特征。 展开更多
关键词 对叠框架 X来X去 反复 方式 语法化 修辞化
地屈孕酮治疗反复性早期流产的效果研究 预览 被引量:3
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作者 于喜红 王尹 《中国继续医学教育》 2016年第35期130-132,共3页
目的 研究地屈孕酮治疗反复性早期流产的临床效果。方法 以反复性早期流产患者86例为研究对象,随机分为实验组和对照组,实验组应用地屈孕酮治疗,对照组应用黄体酮治疗,对两组患者的临床效果进行对比。结果 实验组血清孕酮水平高于对照组... 目的 研究地屈孕酮治疗反复性早期流产的临床效果。方法 以反复性早期流产患者86例为研究对象,随机分为实验组和对照组,实验组应用地屈孕酮治疗,对照组应用黄体酮治疗,对两组患者的临床效果进行对比。结果 实验组血清孕酮水平高于对照组,保胎成功率(93.0%)高于对照组(76.7%);不良反应发生率(11.6%)低于对照组(32.6%),差异均具有统计学意义(P〈0.05)。结论 应用地屈孕酮治疗反复性早期流产,能够显著升高血清孕酮水平,提高保胎成功率,且不良反应少。 展开更多
关键词 地屈孕酮 反复性 早期流产
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Dysfunction of visual spatial attention in occipital stroke patients with hemianopia during the acute phase
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作者 刘晓楠 《中国医学文摘:内科学分册(英文版)》 2016年第1期60-61,共2页
<正>Objective To investigate the visual spatial attention of occipital stroke patients with hemianopia during acute phase.Methods Eight occipital stroke patients with homonymous hemianopia of left side in the ac... <正>Objective To investigate the visual spatial attention of occipital stroke patients with hemianopia during acute phase.Methods Eight occipital stroke patients with homonymous hemianopia of left side in the acute stage and10 age-matched healthy controls were recruited to examine the capability of visual spatial attention.The cue-tar- 展开更多
关键词 matched BLIND statistically repeated BEHAVIORAL REHABILITATION emphasize impair displayed variance
脂溶性维生素注射液治疗摄食不良婴幼儿频发感染
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作者 郭洪新 《中国实用医刊》 2016年第5期4-6,共3页
目的观察脂溶性维生素注射液对摄食不良婴幼儿出现的反复感染的疗效。方法选取2007年3月至2013年1月于邹平县中心医院就诊的摄食不良伴反复呼吸道感染患儿204例,将患儿依据分层随机分组法分为治疗组及对照组,每组102例;对照组予以常... 目的观察脂溶性维生素注射液对摄食不良婴幼儿出现的反复感染的疗效。方法选取2007年3月至2013年1月于邹平县中心医院就诊的摄食不良伴反复呼吸道感染患儿204例,将患儿依据分层随机分组法分为治疗组及对照组,每组102例;对照组予以常规抗感染等对症治疗,治疗组在常规治疗的基础上加用为期10d的脂溶性维生素注射液11131/(kg·d),不超过10ml/d以辅助治疗。结果治疗前两组患儿的白细胞计数(WBC)、血细胞沉降速率(ESR)及体温比较差异未见统计学意义(P〉0.05);治疗3d及1周后,治疗组WBC为(12.46±3.50)×10^9/L、(9.27±3.29)×10^9/L,ESR为(17.39±5.72)mm/h、(14.49±4.76)mm/h,体温为(37.95±1.82)℃、(36.89±2.03)℃,明显低于对照组治疗3d及1周后的WBC(13.91±3.84)×10^9/L、(10.65±3.57)×10^9/L,ESR(19.68±6.83)mm/h、(16.86±5.81)mm/h及体温(38.56±1.90)℃、(37.73±2.14)℃(P〈0.05);治疗组治疗1周后总有效率为98.04%,对照组为91.18%,治疗组高于对照组(P〈0.05)。治疗组治疗1周后咳嗽3例,喘息2例,治疗结束后1年内呼吸道感染复发平均频次为(1.69±0.65)次,均低于对照组的咳嗽12例、喘息10例及1年内呼吸道感染复发平均频次(2.01±0.82)次,差异均有统计学意义(P〈0.05)。结论应用脂溶性维生素注射液可明显增强摄食不良呼吸道感染患儿治疗效果,并可有效改善其呼吸道感染的反复发作。 展开更多
关键词 脂溶性维生素 摄食不良 婴幼儿 呼吸道感染 反复
心脏术后远期三尖瓣关闭不全行右胸微创手术与正中开胸手术的病例对照研究
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作者 姜兆磊 袁源 +6 位作者 尹航 丁芳宝 鲍春荣 马南 黄健兵 张俊文 梅举 《中国胸心血管外科临床杂志》 CAS CSCD 2015年第10期961-965,共5页
目的对比分析右胸前外侧微创手术与常规正中开胸手术治疗心脏术后远期重度三尖瓣关闭不全的安全性及其疗效。方法选取2002年6月至2013年6月在上海交通大学附属新华医院因心脏术后远期重度三尖瓣关闭不全行再次手术治疗的89例患者,其中... 目的对比分析右胸前外侧微创手术与常规正中开胸手术治疗心脏术后远期重度三尖瓣关闭不全的安全性及其疗效。方法选取2002年6月至2013年6月在上海交通大学附属新华医院因心脏术后远期重度三尖瓣关闭不全行再次手术治疗的89例患者,其中右胸前外侧微创手术51例,年龄(46.59±11.53)岁,男28例、女23例,为微创手术组;常规正中开胸手术38例,年龄(50.42±9.30)岁,男15例、女23例,为常规手术组。对比分析两组患者的临床资料及疗效。结果 89例患者均顺利实施再次手术,其中行三尖瓣置换术68例(微创手术vs.常规手术:38例vs.30例),三尖瓣成形术21例(13例vs.8例)。微创手术组的手术时间、建立体外循环时间及术后住院时间较常规手术组明显缩短(P<0.001),且术后早期胸腔积液引流量明显少于常规手术组(P=0.008),而两组体外循环时间差异无统计学意义(P=0.091)。术后早期常规手术组有1例开胸探查止血,2例切口愈合不良。全组术后早期死亡3例(1例vs.2例)。出院前复查超声心动图,显示三尖瓣置换术患者均无瓣周漏出现,三尖瓣成形者均为无反流或仅有轻度的反流。随访12~144个月,全组死亡4例(2例vs.2例)。微创手术组有1例患者为三尖瓣成形术后5年因感染性心内膜炎合并重度三尖瓣关闭不全,行再次三尖瓣置换术;1例三尖瓣成形术后再次出现中度三尖瓣关闭不全,现予药物保守治疗。常规手术组有1例为三尖瓣置换术后机械瓣血栓形成行再次三尖瓣置换术。结论与常规正中开胸手术相比,右胸前外侧微创手术可安全、有效、可靠地应用于心脏术后远期三尖瓣重度关闭不全的治疗中,两组患者瓣膜矫治效果相似,但微创手术组手术时间和住院时间缩短、创伤更小。 展开更多
关键词 微创手术 三尖瓣关闭不全 再次
利用周期重复CLEAN的GNSS欺骗式干扰抑制算法 预览 被引量:3
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作者 王璐 李素姣 +1 位作者 张耀天 吴仁彪 《信号处理》 CSCD 北大核心 2015年第12期1636-1641,共6页
欺骗式干扰能够引导接收机出现定位错误甚至是控制接收机,对全球卫星导航系统在民用以及军事领域的安全应用构成极大的威胁。本文针对转发式欺骗干扰的问题,提出了一种基于周期重复CLEAN的卫星导航欺骗式干扰抑制算法。首先,利用欺骗式... 欺骗式干扰能够引导接收机出现定位错误甚至是控制接收机,对全球卫星导航系统在民用以及军事领域的安全应用构成极大的威胁。本文针对转发式欺骗干扰的问题,提出了一种基于周期重复CLEAN的卫星导航欺骗式干扰抑制算法。首先,利用欺骗式干扰空间和功率特征以及C/A码的周期重复特性,采用CLEAN方法估计多个欺骗式干扰源来向以及欺骗式干扰源个数。其次,结合线性约束最小方差(LCMV)算法和一阶微分约束算法,计算天线自适应权值。高保真数据实验表明本文方法能抑制多个欺骗干扰,且无需接收机反馈信息,可以作为一个独立的抗欺骗式干扰模块嵌入普通接收机。 展开更多
关键词 欺骗式干扰 周期重复 干扰抑制 零陷加宽
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经食道超声心动图在运用腔静脉内阻断技术实施微创三尖瓣再次手术中的应用 预览 被引量:1
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作者 姜兆磊 梅举 +3 位作者 吴淑彬 张韫佼 尹航 沈赛娥 《上海交通大学学报:医学版》 CAS CSCD 北大核心 2014年第2期161-164,共4页
目的探讨经食道超声心动图(TEE)在运用腔静脉内阻断技术实施微创三尖瓣再次手术中的应用价值。方法2002年12月一2012年6月,经右胸前外侧切口,运用腔静脉腔内阻断技术在体外循环心脏不停跳下实施微创三尖瓣再次手术46例,其中男性27... 目的探讨经食道超声心动图(TEE)在运用腔静脉内阻断技术实施微创三尖瓣再次手术中的应用价值。方法2002年12月一2012年6月,经右胸前外侧切口,运用腔静脉腔内阻断技术在体外循环心脏不停跳下实施微创三尖瓣再次手术46例,其中男性27例,女性19例;年龄13~67岁。术中运用TEE全程监测配合整个手术,主要包括指导和评价腔静脉插管的位置、球囊阻断效果,以及评估术前、术后瓣膜反流及心功能情况。结果在TEE引导下运用腔静脉内阻断技术,46例患者均顺利实施了微创三尖瓣再次手术。在建立体外循环时,所有患者上、下腔静脉插管顺利,无再次插管病例;有2例患者TEE显示腔静脉首次阻断不完全,在TEE指引下重新调整插管球囊的位置和大小至阻断完全。46例患者平均手术时间(161±52)min,平均建立体外循环时间(手术开始至体外循环开始时间)(55±15)min,平均体外循环时间(58±23)min。术中TEE显示所有患者三尖瓣启闭功能良好,无明显残余反流,无瓣周漏。全组患者均成功治愈出院。结论运用腔静脉内阻断技术实施微创三尖瓣再次手术时,TEE可安全、可靠地引导和监测手术,具有重要的临床应用价值。 展开更多
关键词 经食道超声心动图 腔内阻断 三尖瓣手术 再次 微创外科手术
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