检索结果-南通市图书馆

Science China Chemistry 2025年第3期 967-973页

作者： Lin Zhang Jia-Qi Ma Yi-zhao Guo Xiu-yuan Li lei Hou Yao-yu Wang Zhonghua Zhu Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials ScienceNorthwest University School of Chemical Engineering The University of Queensland

Ethylene（C2H4） and propylene（C3H6） produced by methanol to olefin（MTO） technology are important chemical raw ***,the purification and separation between C2H4and C3H6mixtures is very ***,a novel microporous metal-organic framework（MOF） adsorbent Co2（OATA）(DPA) was fabricated through mixed linkers of 5,5'-(oxalylbis（azanediyl）)diisophthalic acid（H4OATA） and V-shaped di（pyridin-4-yl）amine（DPA） with –NHCO– and –NH– functional groups,which was endowed with ideal small pore size,large cavity,and interesting C3H6trap constructed by four sets of –NH– *** 298 K and a crucial low pressure（0.05 bar） for the separation in microporous materials,the MOF shows ultra-high C3H6preferential adsorption(97.8 cm3g-1) and considerable C3H6/C2H4selectivity（about 22）,representing an advanced material for the reported porous materials with C3H6/C2H4separation *** studies of single crystal X-ray diffraction and simulations showed that the customized pore limitation in the MOF provided stronger multiple attractive interactions with C3H6,leading to significant adsorption selectivity in the process of competing adsorption for C3H6and *** one separation step,the MOF generated highly pure C2H4（≥99.9%） and C3H6（≥99.6%） products respectively from C2H4/C3H6mixtures at different ratios,pressures,and temperatures.

关键词：

Cacheap:Portable and Collaborative I/O Optimization for Graph Processing

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2019年第3期34卷 690-706页

作者： Peng zhao chen Ding lei Liu Jiping yu Wentao Han Xiao-Bing Feng State Key Laboratory of Computer Architecture Institute of Computing TechnologyChinese Academy of Sciences Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China Department of Computer Science University of RochesterRochester 14623U.S.A. Department of Computer Science and Technology Tsinghua UniversityBeijing 100084China

Increasingly there is a need to process graphs that are larger than the available memory on today's *** systems have been developed with grapli representations that are efficient and compact for out-of-core processing.A necessary task in these systems is memory *** paper presents a system called Cacheap which automatically and efficiently manages the available memory to maximize the speed of grapli processing,minimize the amount of disk access,and maximize the utilization of memory for graph *** has a simple interface that can be easily adopted by existing graph *** paper describes the new system,uses it in recent graph engines,and demonstrates its integer factor improvements in the speed of large-scale grapli processing.

关键词： out-of-core graph processing system I/O optimization memory cache graph analytics locality

倾斜厚煤层开采卸压瓦斯运储区能量耗散结构时变机理研究

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

中国矿业大学学报 2025年第1期54卷 202-214页

作者：赵鹏翔常泽晨李树刚卓日升贾永勇雷雯邵秋冬裴文博西安科技大学安全科学与工程学院陕西西安710054 新疆工程学院新疆煤炭资源绿色开采教育部重点实验室新疆乌鲁木齐830023 西部矿井瓦斯智能抽采工程研究中心陕西西安710054 新疆工程学院新疆煤矿灾害智能防控与应急重点实验室新疆乌鲁木齐830023 新疆维吾尔自治区煤炭科学研究所新疆乌鲁木齐830091 新疆昌吉市菏泽腾达矿业有限责任公司新疆昌吉831100

为了确定倾斜厚煤层开采过程中覆岩能量耗散结构影响下的卸压瓦斯运储区产生和演化规律,针对新疆昌吉市菏泽腾达矿业B5#煤层主采工作面,采用理论研究和物理相似模拟试验探究覆岩裂隙时变规律,明确卸压瓦斯运储区区域范围,定义卸压瓦斯... 详细信息

为了确定倾斜厚煤层开采过程中覆岩能量耗散结构影响下的卸压瓦斯运储区产生和演化规律,针对新疆昌吉市菏泽腾达矿业B5#煤层主采工作面,采用理论研究和物理相似模拟试验探究覆岩裂隙时变规律,明确卸压瓦斯运储区区域范围,定义卸压瓦斯运储区覆岩中的能量耗散结构,确定能量耗散结构种类、形成判据及演化规律,揭示倾斜厚煤层开采卸压瓦斯运储区能量耗散结构时变机理.结果表明:采动过程中上覆岩层破断裂隙密度突变点5.5条/m和贯通度突变点0.57可将裂隙场划分为瓦斯储集区、瓦斯运移区和压实区;依据能量积聚形式将覆岩能量耗散结构分为点能量耗散结构和线能量耗散结构,能量耗散结构形态呈现出“半月”状,能量耗散结构失稳破坏能量判据计算值和现场微震监测测量值误差小于9.58%;现场将钻孔终孔布置在瓦斯运储区中,平均单孔瓦斯抽采纯量和瓦斯抽采体积分数相较于调控前提升1.56倍和1.96倍,上隅角、工作面和回风巷的平均瓦斯体积分数降低至0.31%,0.12%和0.22%,瓦斯抽采效果良好.研究结果进一步为倾斜厚煤层卸压瓦斯高效抽采提供一定的理论指导.

关键词：倾斜厚煤层能量耗散结构卸压瓦斯运储区 “半月”状时变机理

Discovery of Early Paleozoic Garnet Amphibolite in the Wenquan Complex,Northern Margin of the Yili Block,NW China

在线全文

学校读者我要写书评

暂无评论

Acta geologica Sinica(English Edition) 2021年第2期95卷 696-698页

作者： chen youxin chenG Kaikai pei Xianzhi WANG Meng zhao Shaowei LI Zuochen LI Ruibao pei lei GAO feng Key Laboratory of Western China's Mineral Resources and geological Engineering Ministry of EducationSchool of Earth Science and ResourcesChang'an UniversityXi'an 710054China Mechanical Engineering Institute Xi'an Shiyou UniversityXi'an 710065China

Objective High-pressure(HP)and ultrahigh-pressure(UHP)minerals tend to be preserved in mafic and ultramafic metamorphic rocks(*** and garnet amphibolite)rather than felsic ***,HP and UHP rocks are thought to be formed as a result of the tectonic burial or subduction of oceanic crust or thicked continental lithosphere to depths corresponding to the eclogite facies metamorphism,followed by fast uplift(Ernst et al.,2007).

关键词： uplift depths thick

鸡滑液囊支原体ST-qLAMP检测方法的建立及应用

在线全文

学校读者我要写书评

暂无评论

河北农业大学学报 2025年第1期48卷 81-89页

作者：刘昱裴晓萌董振国时国强石磊河北农业大学生命科学学院河北保定071000 河北省科学院生物研究所河北石家庄050000 河北三狮生物科技有限公司河北石家庄050000

鸡滑液囊支原体(Mycoplasma synoviae,MS)是当今世界传播广泛的一种禽类传染性疾病,是蛋鸡和肉鸡养殖场重点防治的鸡病之一。本研究对传统LAMP(Loop-mediated isothermal amplification)检测方法进行改良,并评估其在鸡滑液囊支原体检测... 详细信息

鸡滑液囊支原体(Mycoplasma synoviae,MS)是当今世界传播广泛的一种禽类传染性疾病,是蛋鸡和肉鸡养殖场重点防治的鸡病之一。本研究对传统LAMP(Loop-mediated isothermal amplification)检测方法进行改良,并评估其在鸡滑液囊支原体检测中的应用价值,旨在建立一种能对MS早期感染进行排查及预防的核酸分子检测方法。通过针对MS的vlhA基因的保守序列设计筛选出LAMP引物组,并将其中1条环引物设计为荧光自淬灭探针,建立ST-qLAMP检测方法。建立的ST-qLAMP检测法最佳检测温度为63℃,无非特性扩增,对7个10倍梯度稀释的重组质粒检测,Ct值的线性相关系数R^(2)为0.998,检出限为2.538 copies/μL。对高、中、低浓度试验质粒重复性检测,Ct值的变异系数(Cv)均小于5%。应用qRCR、ST-qLAMP与LAMP对150份疑似感染MS样本进行平行检测,并以qRCR检测结果作为标准,ST-qLAMP的准确率、敏感率和特异率分别为96.67%、100.00%和95.15%,检测时间为45 min。本研究建立了一种改良型LAMP,可以对鸡滑液囊支原体进行快速准确检测,为LAMP的改良与发展提供了一种新思路。

关键词： ST-qLAMP 自淬灭探针鸡滑液囊支原体快速检测

同方期刊数据库博看期刊

Salt stress-induced changes in soil metabolites promote cadmium transport into wheat tissues

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第5期127卷 577-588页

作者： Lifu Wang Luyao Qin Xiaoyi Sun Shuwen zhao lei yu Shibao chen Meng Wang Key Laboratory of Plant Nutrition and Fertilizer Ministry of Agriculture and Rural Affairs/Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081China

Soil salinity is known to improve cadmium(Cd)mobility,especially in arid ***,the mechanisms involved in how salt stress-associated metabolic profiles participate in mediating Cd transport in the soil-plant system remain poorly *** study was designed to investigate the effects of salinity-induced changes in soil metabolites on Cd *** salts in different combinations according to molar ratio(NaCl:Na_(2)SO_(4)=1:1;NaCl:Na_(2)SO_(4):NaHCO_(3)=1:2:1;NaCl:Na_(2)SO_(4):NaHCO_(3):Na_(2)CO_(3)=1:9:9:1;NaCl:Na_(2)SO_(4):NaHCO_(3):Na_(2)CO_(3)=1:1:1:1)were applied to the Cd-contaminated soils,which increased soil Cd availability by 22.36%and the Cd content in wheat grains by 36.61%,compared to the *** stress resulted in soil metabolic reprogramming,which might explain the decreased growth of wheat plants and increased Cd transport from the soil into wheat *** example,down-regulation of starch and sucrose metabolism reduced the production of sugars,which adversely affected growth;up-regulation of fatty acid metabolism allowed wheat plants to maintain a normal intracellular environment under saline conditions;up-regulation of the tricarboxylic acid(TCA)cycle was triggered,causing an increase in organic acid synthesis and the accumulation of organic acids,which facilitated the migration of soil Cd into wheat *** summary,salt stress can facilitate Cd transport into wheat tissues by the direct effect of salt-based ions and the combined effect of altered soil physicochemical properties and soil metabolic profiles in Cd-contaminated soils.

关键词： Saline stress Cadmium availability Wheat growth Metabolite profile Rhizosphere

Single-cell transcriptome profiling identifies the activation of type I interferon signaling in ossified posterior longitudinal ligament

在线全文

学校读者我要写书评

暂无评论

Frontiers of Medicine 2024年第6期18卷 1087-1099页

作者： Xiao Liu lei Zhang ge Wang Wei zhao chen Liang youzhi Tang Yenan Fu Bo Liu Jing Zhang Xiaoguang Liu Hongquan Zhang yu yu Department of Orthopedics and Beijing Key Laboratory of Spinal Disease Research Peking University Third HospitalBeijing100191China Department of Human Anatomy Histology and EmbryologySchool of Basic Medical SciencesState Key Laboratory of Molecular Oncology and International Cancer InstitutePeking University Health Science CenterBeijing100191China

Ossification of the posterior longitudinal ligament(OPLL)is a condition comprising ectopic bone formation from spinal *** disease is a leading cause of myelopathy in the Asian ***,the molecular mechanism underlying OPLL and efficient preventive interventions remain ***,we performed single-cell RNA sequencing and revealed that type I interferon(IFN)signaling was activated in the ossified ligament of patients with *** also observed that IFN-βstimulation promoted the osteogenic differentiation of preosteoblasts in vitro and activated the ossification-related gene SPP1,thereby confirming the single-cell RNA sequencing ***,blocking the IFN-α/βsubunit 1 receptor(IFNAR1)using an anti-IFNAR1 neutralizing antibody markedly suppressed osteogenic ***,these results demonstrated that the type I IFN signaling pathway facilitated ligament ossification,and the blockade of this signaling might provide a foundation for the prevention of OPLL.

关键词： ossification posterior longitudinal ligament osteogenic differentiation IFN signaling

基于1DCNN和PLSDA酸枣仁真伪高光谱图像鉴别中的关键特征分析

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

光谱学与光谱分析 2025年第3期45卷 869-877页

作者：赵昕石玉娜刘怡彤姜洪喆褚璇赵志磊王宝军陈晗河北大学质量技术监督学院河北保定071002 南京林业大学机械电子工程学院江苏南京210037 仲恺农业工程学院机电工程学院广东广州510225 计量仪器与系统国家地方联合工程研究中心河北保定071002

酸枣仁因其养心益肝的功效,是安神助眠类保健品和中药制剂的重要原料。目前市售酸枣仁掺假现象严重,极大损害了消费者利益,扰乱了市场秩序。传统人工检测或基于实验室的高效液相色谱方法存在效率低,推广难的问题。本研究基于卷积神经网... 详细信息

酸枣仁因其养心益肝的功效,是安神助眠类保健品和中药制剂的重要原料。目前市售酸枣仁掺假现象严重,极大损害了消费者利益,扰乱了市场秩序。传统人工检测或基于实验室的高效液相色谱方法存在效率低,推广难的问题。本研究基于卷积神经网络和偏最小二乘判别提出了一种高光谱成像酸枣仁真伪鉴别方法,并对两类模型中的关键光谱特征进行了讨论研究,为后续多光谱系统和便携式仪器开发提供借鉴。提取酸枣仁及其常见伪品(理枣仁、兵豆和枳椇子)高光谱图像(400~1000 nm)中所有单籽粒的平均光谱。基于平均光谱分别建立偏最小二乘判别分析(PLSDA)模型和一维卷积神经网络(1DCNN)模型。PLSDA建模前采用竞争性自适应重加权算法(CARS)挑选特征波长。在1DCNN模型中添加了自定义波长选择层,并对卷积层和全连接层输出结果应用t分布随机邻域嵌入(t-SNE)进行可视化分析。为了与CARS-PLSDA模型进行有效对比,构建了基于五个波长的5W-1DCNN模型。结果表明CARS-PLSDA和1DCNN模型都能获得理想的预测效果,校正集和预测集分类正确率均在99%以上。对比CARS与自定义层挑选的特征波长,670、721和850 nm附近的波长在两种模型中均具有重要作用。研究结果为酸枣仁真伪快速鉴别的多光谱和便携式检测设备提供参考。

关键词：高光谱成像一维卷积神经网络 t分布随机邻域嵌入偏最小二乘法判别分析

Engineering polarization surface of hierarchical ZnO microspheres via spray-annealing strategy for wide-frequency electromagnetic wave absorption

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36期131卷 231-239页

作者： lei Wang Mengqiu Huang Xuefeng yu Wenbin you Biao zhao Chongyun Liang Xianhu Liu Xuefeng Zhang Renchao Che Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsDepartment of Materials ScienceFudan UniversityShanghai 200438China Department of Chemistry Fudan UniversityShanghai 200433China Joint-Research Center for Computational Materials Zhejiang LaboratoryHangzhou 311100China School of Materials Science and Engineering Shanghai Institute of TechnologyShanghai 201418China Key Laboratory of Materials Processing and Mold Zhengzhou UniversityMinistry of EducationZhengzhou 450002China Institute of Advanced Magnetic Materials College of Materials and EnvironmentalEngineeringHangzhou Dianzi UniversityHangzhou 310012China

Regulating orientation growth plays a dominant role in enhancing dielectric properties for the electromagnetic(EM)functional materials,which faces a huge challenge in the synthesis *** sprayannealing strategy,hierarchical ZnO microspheres assembled by ZnO nanorods and nanoparticles were successfully *** confined microsphere space and controlling crystal growth,oriented ZnO nanorods possess rich defects,Zn-polar,O-polar faces,and high ***,temperaturedependency of exposed polarization surfaces is discovered in the semiconductor ZnO nanoparticles with evolved aspect *** pure dielectric EM wave absorption material,the hierarchical ZnO microsphere exhibits adjustable complex permittivity and polarization *** the thickness is 2.4 mm,the hierarchical ZnO-1 absorber shows the widest efficient absorption(RL≤–10 d B)region from 9.9 to18.0 GHz(8.1 GHz,^50.6%testing frequency).The minimum reflection loss(RL)of ZnO-1 can reach–31.5 d B at only 2.0 *** of the outstanding dielectric loss ability and wide absorption frequency,large-scale hierarchical ZnO microspheres can be a potential EM absorption candidate.

关键词： ZnO microspheres Spray drying Electromagnetic wave absorption Orientated polarization Dielectric loss

Responses of soil phosphorus pools accompanied with carbon composition and microorganism changes to phosphorus-input reduction in paddy soils

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2021年第1期31卷 83-93页

作者： Jiahui yuAN lei WANG Hao chen Guanglei chen Shenqiang WANG Xu zhao yu WANG State Key Laboratory of Soil and Sustainable Agriculture Changshu National Agro-Ecosystem Observation and Research StationInstitute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Organic Food Development Center Nanjing Institute of Environmental SciencesMinistry of Environmental ProtectionNanjing 210042China College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China

In rice-wheat rotation systems, changes in soil phosphorus(P) pools and microorganisms in rice-growing seasons have been studied;however, further investigations are required to test whether these indexes exhibit different responses in wheat-growing seasons. Additionally, such studies need to include potential variations in soil carbon(C) structure and microbial community composition. In this study, a long-term rice-wheat rotation P-input reduction experiment was conducted to observe the variations in soil P pools and C composition in the 7th wheat season and to investigate the responses of soil enzyme activity and microbial communities. Four P fertilization treatments were included in the experiment, i.e., P application for rice season only(PR), for wheat season only(PW), and for both rice and wheat seasons(PR+W) and no P application in either season(Pzero). Compared with PR+W treatment, Pzero treatment significantly decreased(P < 0.05) labile and stable P pools. Different P fertilization regimes altered soil microbial community composition and enzyme activity, whereas C composition did not vary. However, PW treatment resulted in relatively more O-alkyl-C than PR treatment and the highest number of microorganisms. Besides, the higher ratios of fungi/bacteria and Gram-positive bactetia/Gram-negative bactetia were related to labile C pools, particularly O-alkyl-C, as opposed to recalcitrant C. Our results clarified the status of soil P pools, C chemistry, and the response of microorganisms under dry-farming conditions in the P input-reduced rice-wheat rotation system.

关键词： 13C nuclear magnetic resonance dry farming enzyme activity microbial community composition phospholipid fatty acid phosphorus fractionation wheat season