检索结果-南通市图书馆

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

一种高精度宽范围共模输入的电流检测电路

微电子学与计算机 2024年第7期41卷 56-63页

作者：张子同江月艳李珂徐叶中国电子科技集团第五十八研究所江苏无锡214035

基于0.18μm HV SOI CMOS工艺,设计实现了一种应用于电流保护系统中的高精度宽范围共模输入的电流检测电路。该电路通过检测采样电阻上的压降来获取电流值变化量;同时基于包含了LDMOS管的保护电路单元实现了宽的共模电压变化范围。此外... 详细信息

基于0.18μm HV SOI CMOS工艺,设计实现了一种应用于电流保护系统中的高精度宽范围共模输入的电流检测电路。该电路通过检测采样电阻上的压降来获取电流值变化量;同时基于包含了LDMOS管的保护电路单元实现了宽的共模电压变化范围。此外,通过电路内置的逻辑控制单元实现输入正负压状态下高低侧运放的切换使用,降低了功耗;利用差分放大器以及跨阻放大器对获取的信号值进行处理,提高了检测精度。测试结果表明,在25℃温度下电路总输出误差<0.67%,在-55℃~125℃温度范围内电路可承受-18V~80 V宽范围共模输入且带宽大于200 kHz,当输入电压在-18V~80 V范围内变化时,输出电压的变化小于40 mV。

关键词：电流检测宽范围高精度逻辑控制

中国共产党历史主动精神的内涵阐释、表现形态和经验启迪

在线全文

学校读者我要写书评

暂无评论

大理大学学报 2024年第1期9卷 21-27页

作者：李祥祥徐叶孙兆静安徽职业技术学院马克思主义学院合肥230011 合肥师范学院马克思主义学院合肥230011

以唯物史观为研究视域,中国共产党历史主动精神是在科学理论指导、长期实践历练、主动担当作为中所形成的主动创造历史的能力素质和精神品格。因不同时期社会实践的丰富性而呈现多样的具体形态,在理论形态上表现为实现马克思主义中国化... 详细信息

以唯物史观为研究视域,中国共产党历史主动精神是在科学理论指导、长期实践历练、主动担当作为中所形成的主动创造历史的能力素质和精神品格。因不同时期社会实践的丰富性而呈现多样的具体形态,在理论形态上表现为实现马克思主义中国化时代化的三次飞跃,实践形态上表现为取得了全方位历史性伟大发展成就,精神形态上表现为建构起中国共产党人的精神谱系,经验形态上表现为形成党史上三个重要历史决议。以史为鉴,继续发扬历史主动精神走好新时代赶考路,应坚持党的领导、强化核心意识,掌握看家本领、坚定崇高信仰,依靠人民群众、激发首创精神,总结历史经验、汲取智慧力量。

关键词：中国共产党历史主动精神唯物史观

维普期刊数据库博看期刊

Changes of tear film and tear secretion after phacoemulsification in diabetic patients

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2008年第4期9卷 324-328页

作者： Xi LIU Yang-shun GU ye-sheng xu Ophthalmology Center the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China

Objective: To evaluate tear film stability and tear secretion in patients with diabetes after phacoemulsification. Methods: Twenty-five diabetic cataract patients and 20 age-matched non-diabetic cataract patients as control underwent pha- coemulsification. Tear film break-up time (TFBUT), Schirmer I test (SIT), corneal fluorescein staining, and dry eye symptoms were measured pre- and postoperatively. Results: Diabetics had a decreased preoperative TFBUT and SIT. TFBUT was reduced on Day 1 and recovered on Day 180 postoperatively in both groups. SIT was increased after phacoemulsification, but returned to preoperative levels by Day 180 in non-diabetics, whereas it was lower than preoperative level in diabetics. Positive corneal fluo- rescein staining was elevated in both groups, and returned to preoperative levels only in controls. Dry eye symptoms were similar to fluorescein staining in both groups. Conclusion: Tear secretion was reduced in diabetic cataract patients after phacoe- mulsification, which worsened dry eye symptoms and predisposed those patients to ocular damage.

关键词： Phacoemulsification Diabetes Cataract Tear

在线全文

学校读者我要写书评

暂无评论

不同类型添加剂对玉米秸秆青贮品质的影响

饲料研究 2024年第5期47卷 99-103页

作者：李旭业董扬尤海洋郭文凯王佳黑龙江省农业科学院畜牧兽医分院黑龙江齐齐哈尔161005 黑龙江省农业科学院齐齐哈尔分院黑龙江齐齐哈尔161006

试验旨在探讨不同添加剂对玉米秸秆青贮品质的影响。试验以京科糯2000收获鲜食玉米穗后的茎秆为青贮原料,设T1 (0.02‰植物乳杆菌)、T2 (2.0%蔗糖)、T3 (0.05‰纤维素酶)、T4 (4%尿素)和CK(对照组,等量蒸馏水)共5个处理,每个处理3次重... 详细信息

试验旨在探讨不同添加剂对玉米秸秆青贮品质的影响。试验以京科糯2000收获鲜食玉米穗后的茎秆为青贮原料,设T1 (0.02‰植物乳杆菌)、T2 (2.0%蔗糖)、T3 (0.05‰纤维素酶)、T4 (4%尿素)和CK(对照组,等量蒸馏水)共5个处理,每个处理3次重复。室温条件下青贮60 d,进行感官评价,测定营养成分、发酵品质及有氧稳定性。结果显示:各添加剂处理组玉米秸秆青贮的感官评价均优于CK。各添加剂处理组的pH值均显著低于CK (P<0.05),乳酸(LA)含量均显著高于CK (P<0.05);除T2外,各添加剂处理组的氨态氮(NH3-N)含量均显著低于CK (P<0.05)。T1和T4的干物质(DM)含量显著低于CK (P<0.05);T2、T3的粗蛋白(CP)含量显著高于CK (P<0.05);T2、T4的中性洗涤纤维(NDF)含量显著低于CK (P<0.05);T1和T2的粗灰分(Ash)含量均显著低于CK (P<0.05);T3的粗脂肪(EE)含量显著高于CK (P<0.05)。各添加剂处理组的有氧稳定时间均显著低于CK (P<0.05)。模糊隶属函数计算结果表明,纤维素酶处理玉米秸秆的D值最高。研究表明,各添加剂处理均可改善玉米秸秆青贮品质,纤维素酶处理效果最好,植物乳杆菌处理效果次之。

关键词：添加剂玉米秸秆青贮品质

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

BL Lac的光学多普勒因子估算

天文学报 2024年第5期65卷 70-77页

作者：黄家伟潘树蓉吴健叶旭鸿曹健鸿樊军辉广州大学物理与材料科学学院广州510006 帕多瓦大学“G.Galilei”物理与天文学院帕多瓦35131 广州大学天体物理中心广州510006 国家天文科学数据中心大湾区分中心广州510006 广东省高等学校天文观测与技术重点实验室广州510006

蝎虎天体(BL Lacertae object,BL Lac)是一类特殊的活动星系核,表现出极端的观测特征,如高光度和偏振、快速光变、超光速运动、射电核主导、极高能辐射等,极端观测特性可能都与喷流效应有关,而表征喷流效应的物理量是多普勒因子(Doppler... 详细信息

蝎虎天体(BL Lacertae object,BL Lac)是一类特殊的活动星系核,表现出极端的观测特征,如高光度和偏振、快速光变、超光速运动、射电核主导、极高能辐射等,极端观测特性可能都与喷流效应有关,而表征喷流效应的物理量是多普勒因子(Doppler factor).多普勒因子有助于了解BL Lac的辐射物理和本征特性.基于BL Lac和Fanaroff-Riley type I/Fanaroff-Riley type II(G)的统一模型思路,提出BL Lac的本征视星等与红移(哈勃图)的分布应该与FRI/FRII(G)的观测视星等与红移的分布相似,并提出了估算BL Lac的光学多普勒因子的方法.该方法所估算的多普勒因子与前人的光学多普勒因子比较具有很好的相关性,说明该光学波段估算BL Lac多普勒因子的方法是可靠的.

关键词：蝎虎天体:普通星系:活动星系:距离和红移星系:喷流

同方期刊数据库

Spatio-temporal variations of vegetation carbon use efficiency and potential driving meteorological factors in the Yangtze River Basin

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2020年第8期17卷 1959-1973页

作者： ye xu-chun LIU Fu-hong ZHANG Zeng-xin xu Chong-yu LIU Jia Chongqing Key Laboratory of Karst Environment&School of Geographical Sciences of Southwest University Chongqing 400715China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098China Department of Geosciences University of Oslo N-0316Norway State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin Institute of Water Resources and Hydropower ResearchBeijing 100038China

Understanding of the vegetation dynamics is essential for addressing the potential threats of terrestrial *** recent years,the vegetation coverage of the Yangtze River Basin(YRB)has increased significantly,yet the spatio-temporal variations and potential driving meteorological factors of carbon use efficiency(CUE)under the context of global warming are still not *** this study,MODIS-based public-domain data during 2000–2015 was used to analyze these aspects in the YRB,a large river basin with powerful ecological functions in ***-temporal variations of CUE in different sub-basins and land cover types were investigated and the correlations with potential driving meteorological factors were *** revealed that CUE in the YRB had strong spatiotemporal variability and varied remarkably in different land cover *** the whole YRB,the average CUE of vegetated land was 0.519,while the long-term change trend of CUE was *** the rising altitude,CUE generally showed an increasing trend until the altitude of 3900 m and then followed by a decreasing *** of grasslands was generally higher than that of croplands,and then forest *** inter-annual variation of CUE in the YRB is likely to be driven by precipitation as a strong positive partial correlation between the inter-annual variability of CUE and precipitation was observed in most of sub-basins and land cover types in the *** influence of temperature and relative humidity is also outstanding in certain regions and land cover *** findings are useful from the view point of carbon cycle and reasonable land cover management under the context of global warming.

关键词： Carbon use efficiency Climate variability MODIS Altitude Land cover type Precipitation

An Asymmetric Non-fullerene Acceptor with Low Energy Loss and High Photovoltaic Efficiency

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2023年第9期41卷 1045-1050页

作者： ye xu Jingwen Wang Huifeng Yao Pengqing Bi Tao Zhang Jianmei xu Jianhui Hou Beijing National Laboratory for Molecular Sciences State Key Laboratory of Polymer Physics and ChemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Photovoltaic Science and Technology Trina SolarChangzhouJiangsu 213031China

Minimizing energy loss(E_(loss))plays a key role in improving the power conversion efficiencies(PCEs)of organic solar cells(OSCs).Here,to reveal the feasibility of the asymmetric molecular strategy in designing high-efficiency and low E_(loss)s OSC materials,we adopt the alkyl-alkoxy modification to design an asymmetric non-fullerene acceptor(NFA)named OC8-4F,where its symmetric alkyl-and alkoxy-substituted counterparties(2OC8-4F,eC9-4F)are also *** results suggest that the introduction of a symmetric alkoxy at the edge of eC9-4F can effectively decrease the lowest unoccupied molecular orbit level without greatly changing the highest occupied molecular orbit level,leading to a mediated *** the devices,the OC8-4F possesses well-balanced charge generation and E_(loss),giving the highest PCE of 18%.Our results imply that finely tuning the asymmetric structure can be used as an effective molecular design strategy to improve the photovoltaic performance of OSCs.

关键词： Organic photovoltaic cells Non-fullerene acceptors Asymmetric synthesis Energy conversion Polymers

Design of ultranarrow-bandgap acceptors for efficient organic photovoltaic cells and highly sensitive organic photodetectors

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

Journal of Energy Chemistry 2022年第9期31卷 388-394,I0011页

作者： ye xu Tao Zhang Huifeng Yao Jingwen Wang Pengqing Bi Jianhui Hou Beijing National Laboratory for Molecular Sciences State Key Laboratory of Polymer Physics and ChemistryCAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

The fabrication of multifunctional electronic devices based on the intriguing natures of organic semiconductors is crucial for organic ***-bandgap materials are in urgent demand for fabricating high-performance organic photovoltaic(OPV)cells and highly sensitive near-infrared organic photodetectors(OPDs).By combining alkoxy modification and an asymmetric strategy,three narrowbandgap electronic acceptors(BTP-4F,DO-4F,and QO-4F)were synthesized with finely tuned molecular electrostatic potential(ESP)*** the careful modulation of electronic configurations,the optical absorption onsets of DO-4F and QO-4F exceeded 1μ*** experimental and theoretical results suggest that the small ESP of QO-4F is beneficial for achieving a low nonradiative voltage loss,while the large ESP of BTP-4F can help obtain high exciton dissociation *** contrast,the asymmetric acceptor DO-4F with a moderate ESP possesses balanced voltage loss and exciton dissociation,yielding the best power conversion efficiency of 13.6%in the OPV *** were also fabricated based on the combination of PBDB-T:DO-4F,and the as-fabricated device outputs a high shot-noise-limited specific detectivity of 3.05×10^(13) Jones at 850 nm,which is a very good result for near-infrared *** work is anticipated to provide a rational way of designing high-performance ultranarrow-bandgap organic semiconductors by modulating the molecular ESP.

关键词： Ultranarrow-bandgap acceptors Asymmetric design strategies Molecular electrostatic potentials Exciton dissociation Non-radiative energy loss

宽筋散热熨治疗骨质疏松性椎体压缩性骨折经皮椎体成形术后残留腰背痛的疗效

在线全文

学校读者我要写书评

暂无评论

中国中西医结合外科杂志 2024年第2期30卷 209-214页

作者：刘华陈晓芳徐晔蔡志刚魏爱淳江苏省海安市中医院骨伤科江苏海安226600

目的:观察并分析宽筋散热熨治疗骨质疏松性椎体压缩性骨折(OVCF)经皮椎体成形术(PVP)后残留腰背痛的临床疗效。方法:纳入2021年3月—2023年8月在我院就诊的PVP术后仍然残留有腰背痛的OVCF患者80例,按照随机数字表法分为治疗组和对照组,... 详细信息

目的:观察并分析宽筋散热熨治疗骨质疏松性椎体压缩性骨折(OVCF)经皮椎体成形术(PVP)后残留腰背痛的临床疗效。方法:纳入2021年3月—2023年8月在我院就诊的PVP术后仍然残留有腰背痛的OVCF患者80例,按照随机数字表法分为治疗组和对照组,每组均40例。对照组口服碳酸钙D3片与阿法骨化醇片,治疗组在对照组基础上加用宽筋散热熨治疗,两组疗程均为4周。观察两组治疗前后视觉模拟疼痛(VAS)评分、腰椎日本骨科协会评估(JOA)评分、血液流变学指标(全血低切黏度、血浆黏度、红细胞聚集指数)、骨密度(左侧股骨颈、左侧桡骨远端)、骨代谢指标[骨钙素(BGP)、Ⅰ型胶原氨基端延长肽(PINP)、β-胶原特殊序列(β-CTX)、抗酒石酸酸性磷酸酶-5b(TRAP-5b)]水平变化,同时进行临床疗效和安全性评价。结果:治疗后,两组较治疗前的VAS评分、全血低切黏度、血浆黏度、红细胞聚集指数、β-CTX及TRAP-5b水平均明显降低(P<0.05);而腰椎JOA评分、骨密度(BMD)、BGP及PINP水平均明显升高(P<0.05)。治疗后,治疗组VAS评分、腰椎JOA评分、血液流变学指标、BMD及骨代谢指标水平均优于对照组(P<0.05)。治疗组、观察组总优良率分别为85.00%、52.50%,治疗组疗效优于对照组(P<0.05)。两组均未发生胃肠道反应、过敏、头晕及皮肤烫伤等不良反应。结论:宽筋散热熨治疗OVCF患者PVP术后残留腰背痛的临床疗效良好,可显著改善临床症状、血液流变学指标、BMD及骨代谢相关指标水平。

关键词：宽筋散热熨骨质疏松性椎体压缩性骨折经皮椎体成形术残留腰背痛