检索结果-南通市图书馆

Proton radioactivity within the generalized liquid drop model with various versions of proximity potentials

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2021年第6期73卷 102-109页

作者： Yu-qi Xin jun-Gang Deng Hong-fei Zhang School of Nuclear Science and Technology Lanzhou University730000 LanzhouChina

In the present work,we systematically investigate the proton radioactivity half-lives of spherical proton emitters adopting a generalized liquid drop model(GLDM)with 16 different proximity potentials,of which the proximity potential Prox.77-13 gives the closest results to the experimental *** with the previous conclusion that the GLDM with proximity potential Prox.77-13 can also best describeαdecay half-lives,which makes the model more uniform and ***,we use the proximity potential Prox.77-13 in GLDM to predict the proton radioactivity half-lives of 14 spherical proton emitters that are allowed energetically but not yet observed experimentally or specifically ***,we research the Geiger-Nuttall law for proton *** results reveal that the Geiger-Nuttall law can also be well used to study the proton radioactivity half-lives of isotopes with the same orbital angular momentum l.

关键词： spherical proton emitter GLDM proximity energy Geiger-Nuttall law

在线全文

学校读者我要写书评

暂无评论

西藏尼洋河多布水电站深厚覆盖层成因分析

地质灾害与环境保护 2024年第1期35卷 63-69页

作者：巨广宏杨芸杨天俊王启鸿符文熹叶飞中国电建集团西北勘测设计研究院有限公司西安710065 四川大学水力学与山区河流保护国家重点实验室四川大学水利水电学院成都610065

西藏尼洋河流域水能资源丰富,然而存在超300m厚度的覆盖层,探明深厚覆盖层的成因对开发水能资源有十分重要的意义。通过对多布水电站坝址深厚覆盖层进行钻探分析、物探解译和综合分析,发现青藏高原特殊的地质环境与气候变迁是多布水电... 详细信息

西藏尼洋河流域水能资源丰富,然而存在超300m厚度的覆盖层,探明深厚覆盖层的成因对开发水能资源有十分重要的意义。通过对多布水电站坝址深厚覆盖层进行钻探分析、物探解译和综合分析,发现青藏高原特殊的地质环境与气候变迁是多布水电站深厚覆盖层形成的直接原因。研究结果表明,尼洋河流域深厚覆盖层成因主要包含“气候型”加积型、河流冲积层、崩滑流加积层、堰塞湖相沉积、“构造型”加积层等5种类型。本文可为含深厚覆盖层地区水电工程选址和开发提供参考和指导。

关键词：多布水电站深厚覆盖层钻探分析物探解译覆盖层成因

碳五馏分中二烯烃选择性加氢催化剂的研究进展

在线全文

学校读者我要写书评

暂无评论

现代化工 2024年第4期44卷 24-28页

作者：蔡璐郑艳霞李玉超左村村黄昊飞崔广军山东理工大学化学化工学院清洁化工研究院山东淄博255000 山东省稀土催化新材料工程研究中心山东淄博255000 淄博鲁华泓锦新材料集团股份有限公司山东淄博255000

总结了用于不饱和烃选择性加氢催化剂的研究进展以及发展前景;重点介绍了近年来对于贵金属Pd基催化剂进行改性处理以提高产物选择性以及非贵金属等金属催化剂的优化策略;对二烯烃选择性加氢催化剂的制备策略进行了进一步的展望。

关键词：碳五馏分催化剂载体 Pd基催化剂 ni基催化剂选择性加氢

Hardware-in-the-loop simulation for the contact dynamic process of flying objects in space

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2016年第8期59卷 1167-1175页

作者： GAO Feng qi ChenKun REN AnYe ZHAOXianChao CAO Rui SUN qiao WANG qian HU yan HE jun jin ZhenLin LIU Renqiang ZHANG Yong GUO WeiZhong HU ZhenYu TANG Ping ni Bo jinG qianFeng WANG Weijun GAO Peng State Key Laboratory of Mechanical System and Vibration School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China Institute of Aerospace System Engineering Shanghai Shanghai 201108 China School of Mechanical Engineering Yanshan University Qinhuangdao 066004 China

In the one-gravity environment on the ground, the simulation of the contact process of two flying objects in the zero-gravity environment of space has been a challenging issue since humans first explored space by flying objects. Hardware-in-the-loop （HIL） simulation is an important and effective method to test the usability, reliability, and safety of real docking mechanisms in space. There are four main issues for HIL simulation systems： Design of simulators capable of high frequency response, high motion precision, high velocity, and rapid acceleration; compensation for simulation distortion; design of a control model for the HIL simulation process; and experimental verification. Here, we propose a novel HIL simulator system with a 6-DOF 3-3 perpendicular parallel mechanism and a 3-DOF 3-PRS parallel mechanism; discover the principle of simulation distortion; present distortion compensation models for the force measurement system, dynamic response, and structural dynamics of the simulator; and provide a control model for the HIL simulation process. Two kinds of experiments were performed on the pas- sive-undamped elastic rod and the docking mechanisms to test their performances and to verify the effectiveness and usability of the HIL simulator. The HIL simulation system proposed in this paper is useful for developing space docking, berthing, refu- eling, repairing, upgrading, transporting, and rescuing technologies.

关键词： hardware-in-the-loop simulation hybrid simulation docking simulation contact dynamics parallel mechanisms simulation distortions distortions compensation

Predicting bioactive compounds and cancer-related molecular targets of lotus seedpod (Receptaculum Nelumbinis) based on network pharmacology and molecular docking

在线全文

学校读者我要写书评

暂无评论

Food and Health 2024年第2期6卷 14-41页

作者： jian-Lin Shen Meng-Tong Zhang fei Li jia-Yu Huang Quan-Sheng Xu Han-Yue Zhang jun Zhang jing Li yan-Ping Li qi Zou Xiao-Yin Wang School of Public Health and Health Management Gannan Medical UniversityGanzhou 341000China Scientific Research Center Gannan Medical UniversityGanzhou 341000China Key Laboratory of Development and Utilization of Gannan Characteristic Food Function Component of Ganzhou Gannan Medical UniversityGanzhouChina

Background:Lotus seedpod(Receptaculum Nelumbinis)is the abundant by-products produced during lotus seed processing,and the sources are usually considered to be wastes and are abandoned outdoors or *** study aims at predicting its bioactive compounds and cancer-related molecular targets against six cancers,including lung cancer,gastric cancer,liver cancer,breast cancer,ovarian cancer and cervical ***:Network pharmacology and molecular docking methods were ***:Network pharmacology results indicated that 14 core compounds(liensinine,tetrandrine,lysicamine,tricin,sanleng acid,cireneol G,ricinoleic acid,linolenic acid,5,7-dihydroxycoumarin,apigenin,luteolin,morin,quercetin and isorhamnetin)and 10 core targets(AKT1,ESR1,HSP90AA1,jun,MAPK1,MAPK3,PIK3CA,PIK3R1,SRC and STAT3)were screened for lotus seedpod against the six *** docking analysis suggested that the binding abilities between the core compounds and the core targets were mostly *** analysis revealed that the intersected targets between the bioactive compounds of lotus seedpod and the six cancers were significantly related to biological processes,cell compositions and molecular *** analysis showed that PI3K-Akt,TNF,Ras,MAPK,HIF-1 and C-type lectin receptor signaling pathways were notably involved in the anti-cancer activities of lotus seedpod against the six ***:14 core compounds and 10 core targets were screened for lotus seedpod against lung cancer,gastric cancer,liver cancer,breast cancer,ovarian cancer and cervical *** study supports the application of lotus seedpod in treating cancers,and promotes the recycling and the high-value utilization.

关键词： Lotus seedpod Anti-cancer Bioactive compounds Molecular targets Network pharmacology Molecular docking.

应变弹性成像和彩色多普勒技术对二维超声诊断的乳腺非肿块型病变的诊断价值

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

影像技术 2024年第3期36卷 70-75页

作者：李琳孙俊旗肖雨雄单菲菲汕头大学医学院附属粤北人民医院超声诊断科广东512000 汕头大学医学院附属粤北人民医院影像诊断科广东512000

目的:探讨应变弹性成像(strain elastography,SE)和彩色多普勒技术(color Doppler flow image,CDFI)对二维超声(two-dimensional ultrasound,2D US)诊断的乳腺非肿块型病变(non-mass-like lesions,NML)的诊断价值,提高乳腺非肿块型病变的检出率。方法:回顾性分析102例经2D US、CDFI及SE诊断、并经病理学证实的乳腺非肿块型病变,计算2D US、CDFI及SE的诊断效能,来区分乳腺非肿块型病变的良恶性。结果:102例中,良性46个,恶性56个。2D US诊断敏感度75.00%、特异度56.67%、准确率66.7%、AUC 0.662;SE诊断敏感度86.11%、特异度83.33%、准确率84.85%、AUC 0.902;CDFI诊断敏感度80.56%、特异度66.67%、准确率74.24%、AUC 0.828;2D US+SE+CDFI诊断敏感度91.67%、特异度90.00%、准确率90.91%、AUC 0.974。结论:2D US联合SE和CDFI可以提高乳腺非肿块型病变的诊断价值,有助于预测非肿块型乳腺恶性病变。

关键词：乳腺非肿块型病变应变弹性成像彩色多普勒技术

A coumarin-based colorimetric and fluorescent probe for the highly selective detection of Au^(3+) ions

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2016年第9期27卷 1563-1566页

作者： qi Wang yan Feng jun jiang wen-Juan Wang jiu-You Chen Hong-Ting Sheng Xiang-Ming Meng Man-Zhou Zhu School of Chemistry and Chemical Engineering & Center for Atomic Engineering of Advanced Materials Anhui University

We develop a novel coumarin-all〈yne derivative （NC7-AL）, which can specifically react with Au^3＋ and give a colorimetric and fluorescent ＂turn-on＂ response toward Au3~, Notably, other alkynophilic metal species such as Au^＋, Ag^＋, Pd^2＋, ni^2＋, Cu^2＋, and Hg^2＋ do not produce an interfering signal. A good linear relationship between emission intensity at 420 nm and Au^3＋ concentration from 0 to 2 equivalent is observed, and the detection limit （3σ/k） is estimated to be ca. 3.58 nmol/L. Harnessing the Au^3＋ .

关键词： Coumarin Alkyne Au^3+ Colorimetric Fluorescent probe

Suspension calcination and alkali leaching of low-grade high-sulfur bauxite:Desulfurization, mineralogical evolution and desilication

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2020年第5期27卷 602-610页

作者： Hong-fei Wu jun-qi Li Chao-yi Chen fei-long Xia Zhen-shan Xie Department of Metallurgical Engineering College of Materials and MetallurgyGuizhou UniversityGuiyang 550025China Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving Guiyang 550025China

To enable the utilization of low-grade and high-sulfur bauxite, the suspension calcination was used to remove the sulfur and the activate silica minerals, and the calcinated bauxite was subjected to a desilication process in Na OH solution under atmospheric pressure. The desulfurization and desilication properties and mineralogical evolution were studied by X-ray diffraction, thermogravimetry–differential thermal analysis, scanning electron microscopy, and FactSage methods. The results demonstrate that the suspension calcination method is efficient for sulfur removal: 84.21% of S was removed after calcination at 1000°C for 2 min. During the calcination process, diaspore and pyrite were transferred to α-Al2O3, magnetite, and hematite. The phase transformation of pyrite follows the order FeS2 → Fe3O4 → Fe2O3, and the iron oxides and silica were converted into iron silicate. In the alkali-soluble desilication process, the optimum condition was an alkali solution concentration of 110 g/L, a reaction time of 20 min, and a reaction temperature of 95°C. The corresponding desilication ratio and alumina loss ratio were 44.9% and 2.4%, respectively, and the alumina-to-silica mass ratio of the concentrate was 7.9. The Al2O3·2SiO2, SiO2, and Al2O3 formed during the calcination process could react with Na OH solution, and their activity decreased in the order of Al2O3·2 SiO2, SiO2, and Al2O3.

关键词： low-grade bauxite sulfur suspension calcination alkali-soluble desilication Bayer process

NovaPave超粘精罩面在高速公路修复养护中的应用

在线全文

学校读者我要写书评

暂无评论

建筑技术 2024年第7期55卷 817-821页

作者：郑永飞刘俊奇中交第四公路工程局有限公司北京100000

随着高速公路的快速发展,公路网日益成熟,在已运营的高速公路修复和预性养护中,利用“四新”技术延长使用寿命是一种新趋势。通过对贵都高速隧道内路面产生的病害原因分析及病害处置,重点对隧道内使用NovaPave超粘精罩面的原材料、施工... 详细信息

随着高速公路的快速发展,公路网日益成熟,在已运营的高速公路修复和预性养护中,利用“四新”技术延长使用寿命是一种新趋势。通过对贵都高速隧道内路面产生的病害原因分析及病害处置,重点对隧道内使用NovaPave超粘精罩面的原材料、施工方法、混合料的配合比设计以及施工过程中易出现的质量问题、改进措施等进行总结,可为类似工程施工提供参考。

关键词： NovaPave超粘精罩面高速公路修复病害分析