检索结果-南通市图书馆

Journal of Materials Science & Technology 2019年第1期35卷 94-99页

作者： Zhongwei Ma Yanye Jin Shude Ji xiangchen Meng lin Ma Qinghua li School of Aerospace Engineering Shenyang Aerospace University

Ultrasonic assisted friction stir welding(UaFSW) was used to join 6061-T6 aluminum and Ti6Al4 V alloys.A small plunge depth endowed with the low heat input was used and the sound joints without obvious thickness reduction were achieved. A diffusion-type bonding without the intermetallic compounds layer was observed at the joint interface. The ultrasonic improved the diffusion thickness and decreased the average size of grains and titanium alloy fragments. A hook-like structure was formed at the bottom interface of the UaFSW joint, which improved the bonding length and the mechanical interlocking. The microhardness of the stir zone was increased because of the further grain refinement induced by ultrasonic. The maximum tensile strength of the UaFSW joint was 236 MPa, which reached 85% of the base6061-T6 alloy.

关键词： Friction stir welding Ultrasonic Aluminum/titanium alloys Microstructure Mechanical properties

阿扎胞苷联合维奈克拉或CAG方案治疗老年初治急性髓系白血病患者效果和安全性比较

在线全文

学校读者我要写书评

暂无评论

肿瘤研究与临床 2024年第5期36卷 356-360页

作者：葛文军葛宋钰张向臣李霞王丽段建宇杨晶马一栋大同市第五人民医院血液科大同037009 中国医科大学第一临床学院沈阳110000 大同市第五人民医院肿瘤放疗科大同037009

目的比较阿扎胞苷联合维奈克拉或CAG方案对初治老年急性髓系白血病(AML)的疗效和安全性。方法回顾性队列研究。回顾性分析2018年5月至2023年8月大同市第五人民医院收治的34例老年初治AML患者的临床资料。依据治疗方案将患者分为维奈克拉... 详细信息

目的比较阿扎胞苷联合维奈克拉或CAG方案对初治老年急性髓系白血病(AML)的疗效和安全性。方法回顾性队列研究。回顾性分析2018年5月至2023年8月大同市第五人民医院收治的34例老年初治AML患者的临床资料。依据治疗方案将患者分为维奈克拉组(阿扎胞苷+维奈克拉,17例)和CAG组(阿扎胞苷+CAG方案,17例)。比较两组患者的临床特征、疗效、不良反应及生存情况。结果两组临床资料比较,差异均无统计学意义(均P>0.05)。维奈克拉组完全缓解率和客观反应率分别为70.6%(12/17)、82.4%(14/17),均高于CAG组的47.1%(8/17)、64.7%(11/17),但两组差异均无统计学意义(χ2=2.00,P=0.163;χ2=2.00,P=0.244)。患者随访时间[M(Q1,Q3)]为25.4个月(7.2个月,60.3个月)。至随访结束,34例患者中19例生存(维奈克拉组13例,CAG组6例),15例死亡(维奈克拉组4例,CAG组11例)。维奈克拉组和CAG组中位总生存时间分别为14.22个月(95%CI:8.2~60.3个月)和10.56个月(95%CI:7.2~50.2个月),中位无进展生存时间分别为9.97个月(95%CI:5.4~40.5个月)和6.82个月(95%CI:5.0~36.2个月),两组总生存、无进展生存时间差异均无统计学意义(均P>0.05)。维奈克拉组和CAG组分别有16、14例患者发生3~4级血液学不良反应。两组粒细胞缺乏时间、血小板缺乏时间、感染及出血发生率比较,差异均无统计学意义(均P>0.05)。结论阿扎胞苷联合维奈克拉或CAG方案治疗老年初治AML患者均有较好的临床效果和安全性。

关键词：白血病髓样急性老年人阿扎胞苷维奈克拉 CAG方案治疗结果

Modulate the superficial structure of La_(2)Ce_(2)O_(7) catalyst with anchoring CuO_(x) species for the selective catalytic oxidation of NH_(3)

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第16期111卷 1-8页

作者： xiangchen Kong Zhenguo li Yuankai Shao Xiaoning Ren Kaixiang li Hanming Wu Congjie Lv Cheng Lv Shengli Zhu National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research Center Co.Ltd.Tianjin 300300China School of Materials Science and Engineering Tianjin UniversityTianjin 300350China School of Materials Science and Engineering Lanzhou Jiaotong UniversityLanzhou 730070China

Air contamination caused by the ammonia slip phenomenon has gradually captured the researcher’s extensive *** effective strategy for controlling fugitive NH_(2)is critical to improving the air quality and living *** the present work,CuO_(x)/La_(2)Ce_(2)O_(7)composite as a potential candidate catalyst is synthesized through the electrostatic adsorption method for the selective catalytic oxidation(SCO_(2))of NH_(2)to *** 5%Cu Ox/La_(2)Ce_(2)O_(7)exhibits the best catalytic activity(T=243℃)and ammonia conversion *** improvement of performance is mainly attributed to the superficial connection of[Ce-O-Cu],which enhances the capturing ability of ammonia molecule and accelerates the dissociating efficiency of N–H bonding for Nevolution,*** work provides a facile method to synthesis pyrochlore-like composite catalyst of NH_(2)-SCO_(2) for solving the problem of ammonia slip pollution in the future.

关键词： La_(2)Ce_(2)O_(7)catalyst Selective catalytic oxidation CuO_(x)species Ammonia slip

水-岩作用对富有机质页岩应力敏感性的影响——以渝东南地区龙马溪组页岩为例

在线全文

学校读者我要写书评

暂无评论

油气藏评价与开发 2019年第5期9卷 54-62页

作者：康毅力白佳佳李相臣陈明君游利军李鑫磊李清房大志西南石油大学油气藏地质及开发工程国家重点实验室四川成都610500 中国石化华东油气分公司勘探开发研究院江苏南京210000

页岩气的产出是跨越多种尺度,历经多种传质方式的复杂过程。每一个路径的应力敏感性都会对页岩气的传质过程产生重要影响。尤其是当巨量压裂液滞留在页岩储层中,水—岩作用必然会对页岩应力敏感性产生影响。以渝东南地区龙马溪组页岩为... 详细信息

页岩气的产出是跨越多种尺度,历经多种传质方式的复杂过程。每一个路径的应力敏感性都会对页岩气的传质过程产生重要影响。尤其是当巨量压裂液滞留在页岩储层中,水—岩作用必然会对页岩应力敏感性产生影响。以渝东南地区龙马溪组页岩为研究对象,开展了水—岩作用前后页岩应力敏感性评价实验,表征了应力敏感实验前后裂缝面性质变化特征,分析了水—岩作用对裂缝面的作用机理。页岩初始缝宽越宽,应力敏感性越强。页岩发生水—岩作用后其应力敏感程度从高到低依次为:碱敏>矿化度降低的盐敏>水敏。矿化度降低的盐敏和水敏过程中,黏土矿物水化膨胀,并发生了微粒运移,裂缝表面更加光滑;而碱敏过程流体不仅与裂缝表面发生了水化作用,而且发生了碱液侵蚀,加剧了页岩应力敏感程度。含支撑剂的裂缝页岩应力敏感程度减弱,支撑剂的嵌入和破碎是产生应力敏感性的主要原因,支撑剂优选和合理铺置是降低应力敏感程度的关键。

关键词：孔隙结构裂缝面性质水-岩作用应力敏感性页岩

Signal acquisition of Luojia-1A low earth orbit navigation augmentation system with software defined receiver

在线全文

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2022年第1期25卷 47-62页

作者： liang Chen xiangchen Lu Nan Shen Lei Wang Yuan Zhuang Ye Su Deren li Ruizhi Chen State Key Laboratory Of Information Engineering In Surveying Mapping And Remote SensingWuhan UniversityWuhanChina

Low Earth Orbit(LEO)satellite navigation signal can be used as an opportunity signal in the case of a Global Navigation Satellite System(GNSS)outage,or as an enhancement by means of traditional GNSS positioning *** matter which service mode is used,signal acquisition is a prerequisite for providing enhanced LEO navigation *** with the medium orbit satellite,the transit time of the LEO satellite is ***,it is of great significance to expand the successful acquisition time range of the LEO *** studies on LEO signal acquisition are based on simulation ***,signal acquisition research based on real data is *** this work,the signal characteristics of LEO satellites:power space density in free space and the Doppler shift of LEO satellites are individually *** unified symbolic definitions of several integration algorithms based on the parallel search signal acquisition algorithm are *** verify these algorithms for LEO signal acquisition,a Software Defined Receiver(SDR)is *** performance of these integration algorithms on expanding the successful acquisition time range is verified by the real data collected from the Luojia-1A *** experimental results show that the integration strategy can expand the successful acquisition time range,and it will not expand indefinitely with the integration *** performance of the coherent integration and differential integration algorithms is better than the other two integration algorithms,so the two algorithms are recommended for LEO signal acquisition and a 20 ms integration duration is *** detection threshold of 2.5 is not suitable for all integration algorithms and various integration durations,especially for the Maximum-to-Mean Ratio indicator.

关键词： Coherent integration differential coherent integration Low Earth Orbit(LEO) non-coherent integration navigation augmentation signal acquisition

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

自体角膜缘移植与羊膜移植治疗翼状胬肉

山东大学基础医学院学报 2003年第2期17卷 109-110页

作者：陶祥臣牟国营李新袁中芳朱丽贞国纪林济南市中心医院眼科济南250013

目的 :观察自体角膜缘移植与羊膜移植治疗翼状胬肉的疗效。方法 :为初发性翼状胬肉 2 0例、2 0眼行自体角膜缘移植 ,33例、35眼行羊膜移植 ,随访 5～ 19月 ,平均 12月。结果 :自体角膜缘植片轻度水肿 ,1周内消失 ,2～ 3周巩膜裸露区结... 详细信息

目的 :观察自体角膜缘移植与羊膜移植治疗翼状胬肉的疗效。方法 :为初发性翼状胬肉 2 0例、2 0眼行自体角膜缘移植 ,33例、35眼行羊膜移植 ,随访 5～ 19月 ,平均 12月。结果 :自体角膜缘植片轻度水肿 ,1周内消失 ,2～ 3周巩膜裸露区结膜上皮修复 ,长入新生血管。羊膜植片水肿 ,7～ 10d消失 ,2～ 3周新生血管化 ,无排斥反应发生。随访期内 ,2组均无胬肉复发。结论 :自体角膜缘移植和羊膜移植可有效地阻止胬肉复发。

关键词：自体角膜缘移植羊膜移植手术治疗翼状胬肉眼表疾病并发症

硬性透气性角膜接触镜对散光性弱视的矫治作用

在线全文

学校读者我要写书评

暂无评论

眼视光学杂志 2008年第5期10卷 394-395页

作者：陶祥臣石岩李云杰张慧卿牟国营山东大学附属济南市中心医院眼科山东济南250013 山西省眼科医院山西太原030002

目的评价硬性透气性角膜接触镜(rigid gas per-meable contact lens,RGPCL)对儿童散光性弱视的矫治作用及其安全性。方法选取框架眼镜矫治效果欠佳的儿童散光性弱视23例(46眼),其中,单纯远视性散光5眼,复合远视性散光23眼,复合近视性散... 详细信息

目的评价硬性透气性角膜接触镜(rigid gas per-meable contact lens,RGPCL)对儿童散光性弱视的矫治作用及其安全性。方法选取框架眼镜矫治效果欠佳的儿童散光性弱视23例(46眼),其中,单纯远视性散光5眼,复合远视性散光23眼,复合近视性散光14眼,混合散光4眼。依据框架眼镜矫正视力分为轻度弱视组(13眼),中度弱视组(22眼),重度弱视组(11眼)。所有患儿配戴高透气性RGPCL,随访12个月,观察其矫治作用。结果配戴RGPCL即时,矫正视力较框架眼镜提高1～4行,平均(2.7±0.9)行,达到或超过5.0者7眼(15.22%)。12个月后,28眼(60.87%)的矫正视力≥5.0,其中,轻度弱视组11眼(84.62%),中度弱视组17眼(77.27%),重度弱视组无一眼达到5.0。观察期内无严重角、结膜损伤以及感染等并发症发生,无因不能耐受而停戴者。结论RGPCL对儿童散光性弱视的矫治是有效而安全的,框架眼镜矫治效果欠佳者可优先选择RGPCL。

关键词：弱视硬性透气性角膜接触镜散光儿童

A Multifunctional {P_(2)Mo_(5)}-based Hybrid Applying to Catalysis, Electrocatalysis and Dye Adsorption

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2022年第6期38卷 1553-1560页

作者： liU Xiaodong WANG xiangchen XU Na ZHANG Zhong li Xiaohui liU Guocheng WANG Xiuli liaoning Professional Technology Innovation Center of liaoning Province for Conversion Materials of Solar Cell College of Chemistry and Materials EngineeringBohai UniversityJinzhou121013P.R.China

As a common environmental pollutant, thioether can cause serious environmental pollution, so selective oxidation of thioether has become one of the current research hotspots. In this paper, an inorganic-organic hybrid based on a Standberg-type polyoxometalate, [Hbiz]_(5)[HP_(2)Mo_(5)O_(23)]·5H_(2)O(1)(biz=benzimidazole), was obtained by adjusting pH under hydrothermal conditions. The structure was characterized by infrared spectroscopy, thermogravimetric analysis, and single-crystal X-ray diffraction. Compound 1 can be used as an excellent catalyst for the oxidation of thioanisole. The experimental results showed that thioanisole could be catalytically oxidized to methyl phenyl sulfoxide by compound 1 as a catalyst within 40 min. The conversion rate and selectivity reached 99%. Compound 1 had good cycling stability as a heterogeneous catalyst. In addition, the electrocatalytic reduction of H_(2)O_(2) and Cr_(2)O_(7)^(2−) for hybrid 1 was preliminarily investigated. In addition, the adsorption performance of hybrid 1 on cationic dye crystal violet and methylene blue was tested, and the adsorption efficiencies can reach 98.5% and 86.3%, respectively.

关键词： Polyoxometalate Catalysis Electrocatalysis Dye adsorption

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

致密煤岩气藏压裂液损害实验评价

断块油气田 2014年第2期21卷 269-272页

作者：康毅力周来诚池晓明李相臣陈德飞陈飞西南石油大学油气藏地质及开发工程国家重点实验室四川成都610500 中国石油川庆钻探工程有限公司长庆井下技术作业公司陕西西安710000

致密煤岩气藏必须采取增产改造措施才能获得经济产量。部分煤层气井在压裂施工后,未达到理想产量,主要原因之一是压裂液对储层的损害。国内外开展压裂液对煤岩储层损害评价时,多采用煤粉压制的人造岩心,不能真实反映煤岩储层天然结构特... 详细信息

致密煤岩气藏必须采取增产改造措施才能获得经济产量。部分煤层气井在压裂施工后,未达到理想产量,主要原因之一是压裂液对储层的损害。国内外开展压裂液对煤岩储层损害评价时,多采用煤粉压制的人造岩心,不能真实反映煤岩储层天然结构特性。文中以宁武盆地致密煤岩为研究对象,钻取柱状煤岩样品,开展了盐敏和压裂液损害评价实验。盐敏实验确定实验用KCl溶液的质量分数为1%。压裂液损害实验表明,活性水压裂液、清洁压裂液A、离子平衡压裂液的平均损害程度分别为46.61%,39.12%,85.42%,煤样与这3种压裂液作用后接触角减小、亲水性增强、压裂液返排困难;而弱酸性清洁压裂液B使煤样渗透率平均提高了46.57%,亲水性减弱。综合分析认为,损害煤岩储层的主要机理是亲水性压裂液吸附导致的煤岩基质膨胀。该研究方法及获得的认识对致密煤岩气藏压裂液设计具有借鉴意义。

关键词：煤层气致密煤岩储层损害压裂液润湿性

在线全文

学校读者我要写书评

暂无评论

无角道塞特羊胚胎移植技术研究

中国农学通报 2005年第7期21卷 13-16页

作者：权富生赵晓娥张志平刘凤军李向臣张涌西北农林科技大学生物工程研究所陕西杨凌712100

(1)超排处理无角道塞特绵羊163只,育成羊(76只)只均回收胚胎5.53枚,可用胚3.91枚,经产母羊(87只)只均回收胚胎7.55枚,可用胚6.34枚。经产羊平均回收胚胎总数高于育成羊(P0.05)。(2)共处理受体876只,春季和秋季受体的同期发情率分别为56.... 详细信息

(1)超排处理无角道塞特绵羊163只,育成羊(76只)只均回收胚胎5.53枚,可用胚3.91枚,经产母羊(87只)只均回收胚胎7.55枚,可用胚6.34枚。经产羊平均回收胚胎总数高于育成羊(P0.05)。(2)共处理受体876只,春季和秋季受体的同期发情率分别为56.37%和89.02%,发情受体利用率分别为84.67%和88.77%。(3)移植受体545只,妊娠318只,产羔396只,受体移植妊娠率为58.35%,移植胚胎成羔率为57.47%,在移植受体中,小尾寒羊的妊娠率最高为61.2%,同羊和内蒙细毛羊分别为54.62%和56.58%,受体品种之间移植妊娠率差异不显著(P>0.05)。受体黄体数对移植妊娠率及胚胎成羔率有一定的影响。胚胎的发育阶段对移植妊娠率也有影响,移植囊胚受体妊娠率最高为64.76%,明显高于早期桑椹胚移植妊娠率42.86%(P0.05)。

关键词：胚胎移植技术无角道塞特羊移植妊娠率胚胎成羔率重复超排同期发情率超排处理超排效果小尾寒羊发育阶段育成羊可用胚桑椹胚受体回收胚胎数共处理利用率细毛羊平均秋季春季囊胚绵羊母羊产羔同羊