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铝球弹丸超高速正撞击薄铝板穿孔尺寸研究

工程力学 2007年第12期24卷 181-185,192页

作者：管公顺庞宝君崔乃刚哈跃哈尔滨工业大学航天学院哈尔滨150080

利用2017-T4铝球弹丸高速正撞击不同厚度的2A12铝合金板,模拟空间碎片对航天器防护屏的高速撞击作用,分析铝合金板撞击穿孔尺寸特征。铝球弹丸直径为3.18mm^6.35mm,弹丸直径与铝板厚度之比dp/t为1.00~9.96,撞击速度为1.50km/s^6.98km/s... 详细信息

利用2017-T4铝球弹丸高速正撞击不同厚度的2A12铝合金板,模拟空间碎片对航天器防护屏的高速撞击作用,分析铝合金板撞击穿孔尺寸特征。铝球弹丸直径为3.18mm^6.35mm,弹丸直径与铝板厚度之比dp/t为1.00~9.96,撞击速度为1.50km/s^6.98km/s,得到了铝球弹丸高速正撞击铝板的穿孔经验公式。实验结果表明:薄铝板高速撞击穿孔直径扩张率与弹丸直径、铝合金板厚度及撞击速度有关。当弹丸直径与铝合金板厚度之比dp/t一定时,薄铝板撞击穿孔直径扩张率随着撞击速度的增大而增大;当撞击速度一定时,薄铝板撞击穿孔直径扩张率与dp/t呈非线性关系,且随着dp/t的增加,对薄铝板撞击穿孔直径扩张率的影响减弱。

关键词：航天器超高速撞击穿孔尺寸薄铝板空间碎片

NaAlSi_3O_8-hollandite and other high-pressure minerals in the shock melt veins of the Suizhou meteorite

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Chinese Science Bulletin 2001年第13期46卷 1121-1126页

作者： XIE Xiande, CHEN Ming, WANG Deqiang & el Goresy A.1.Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 2. Max-Planck-Institute fur Chemie, 55128 Mainz, Germany Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China Max-Planck-Institute für Chemie 55128 Mainz Germany

The Suizhou L6 chondrite contains a few very thin shock melt veins of 0.02-0.09 mm in width. In spite of small width of the veins, shock-induced high-pressure phases, such as coarse-grained NaAlSi3O8-hollandite, ringwoodite, majorite and fine-grained matrix majorite-pyropess have been discovered in these veins. NaAlSi3O8-hollandite, the high-pressure phase of plagioclase, in Suizhou shock veins occurs as a single phase mineral, no silicate glassy phase, such as albitic glass, was incorporated with it. The presence of above-mentioned high-pressure phases constrains the high pressure (up to 23-24 GPa) and high temperature (up to 1900-2000℃) regime in Suizhou shock veins, and indicates that the duration of high-pressure regime in the veins should be long enough (a few seconds) for phase transformation and crystallization of minerals under pressure. The discovery of the first natural single-phase crystalline NaAlSi3O8- holland-ite in Suizhou meteorite is of important significance in understanding the Earth’

关键词： high NaAlSi3O8-hollandite and other high-pressure minerals in the shock melt veins of the Suizhou meteorite

在科学与人文之间:马林诺夫斯基的现代性人类学

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西北民族研究 2020年第2期 178-189页

作者：马威哈正利华中农业大学文法学院武汉430070 中南民族大学武汉430074

马林诺夫斯基呼应了思想界新人文主义思潮,他通过坚持实证的科学方法,以及对人文领域的关注,形成了现代人类学研究科学与人文结合的特点。马林诺夫斯基将人类学的学科价值放置于新人文主义的思想脉络中,同时又通过严谨的科学实践支撑着... 详细信息

马林诺夫斯基呼应了思想界新人文主义思潮,他通过坚持实证的科学方法,以及对人文领域的关注,形成了现代人类学研究科学与人文结合的特点。马林诺夫斯基将人类学的学科价值放置于新人文主义的思想脉络中,同时又通过严谨的科学实践支撑着人类学不断帮助人们走向对异文化的理解,走向对多元文化的包容,将人类学带出了工具学科的局限。时至今日,在某种层面上,人类学家们仍然在马林诺夫斯基所开辟的道路上前行,逐渐形成尊重人类多元文化的人文共识。

关键词：马林诺夫斯基新人文主义科学方法波兰现代思潮现代性

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汉语失语症患者工作记忆的特征研究

听力学及言语疾病杂志 2017年第2期25卷 143-148页

作者：曹艳静刘晋宣丁珊珊郑钦 Kim ha-kyung 华东师范大学言语听觉科学教育部重点实验室上海200062 华东师范大学教育康复学系长沙民政职业技术学院康复医学系上海市徐汇区中心医院康复科上海市残疾人康复职业培训中心

目的采用不同的任务方式和测试材料,探讨失语症患者的工作记忆特征。方法选取15例54~70岁汉语失语症患者(失语症组)与15例正常成人(对照组),分别进行数字、实词和虚词的听觉复述和听觉再认任务测试,以正确完成的最大字符串长度(个)作为... 详细信息

目的采用不同的任务方式和测试材料,探讨失语症患者的工作记忆特征。方法选取15例54~70岁汉语失语症患者(失语症组)与15例正常成人(对照组),分别进行数字、实词和虚词的听觉复述和听觉再认任务测试,以正确完成的最大字符串长度(个)作为工作记忆广度,比较两组工作记忆广度的差异。结果不同任务和测试材料下,失语症组的工作记忆广度均显著小于对照组(P<0.01)。失语症组在正序复述测试中的工作记忆广度显著大于倒序复述、正序再认和倒序再认(P<0.01),倒序复述显著大于倒序再认(P<0.01),正序再认显著大于倒序再认(P<0.01)。在复述任务中,失语症组的工作记忆广度由高到低依次为数字、虚词、实词,但差异无统计学意义;在正序再认中,对数字的工作记忆广度显著大于实词(P<0.01)和虚词(P<0.01),实词显著大于虚词(P<0.01);在倒序再认任务中,对数字的记忆广度显著大于虚词(P<0.01)。结论失语症患者工作记忆广度显著低于正常成人;失语症患者对数字的工作记忆最容易;正序复述最容易,其次为倒序复述和正序再认,倒序再认最难。

关键词：失语症工作记忆复述再认

Identity Verification of Individuals Based on Retinal Features Using Gabor Filters and SVM

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Journal of Signal and Information Processing 2016年第1期7卷 49-59页

作者： Mohamed A. el-Sayed M. hassaballah Mohammed A. Abdel-Latif Department of Mathematics Faculty of Science Fayoum University Fayoum Egypt CS Department College of Computers and Information Technology Taif University Taif KSA Department of Mathematics Faculty of Science South Valley University Qena Egypt

Authentication reliability of individuals is a demanding service and growing in many areas, not only in the military barracks or police services but also in applications of community and civilian, such as financial transactions. In this paper, we propose a human verification method depends on extraction a set of retinal features points. Each set of feature points is representing landmarks in the tree of retinal vessel. Extraction and matching of the pattern based on Gabor filters and SVM are described. The validity of the proposed method is verified with experimental results obtained on three different commonly available databases, namely STARE, DRIVE and VARIA. We note that the proposed retinal verification method gives 92.6%, 100% and 98.2% recognition rates for the previous databases, respectively. Furthermore, for the authentication task, the proposed method gives a moderate accuracy of retinal vessel images from these databases.

关键词： Image Preprocessing Gabor Filter SVM Authentication Identification Verification Retinal Features Feature Extraction Query Image

Ki-67 immunohistochemical expression in mandibular ameloblastoma: A prognostic indicator for local recurrence

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Open Journal of Stomatology 2013年第9期3卷 520-526页

作者： Ayman Hegab Mohmmad Shuman Mohammed Abd el-Akher Delaram Arwlan Medcal City Teaching Hospital Teaching Laboratory Baghdad Iraq Oral and Maxillofacial Surgery Faculty of Dental Medicine Al-Azhar University Assuit Egypt Oral and Maxillofacial Surgery Faculty of Dental Medicine Al-Azhar University Cairo Egypt

Objective: This study used Ki-67 to evaluate the proliferative activity of ameloblastoma in an attempt to provide a scientific basis for any differences in the biologic behaviour that exists between the different types of ameloblastoma and correlate the results with the recurrence rate. Study design: We assessed Ki-67 expression by immunohistochemistry in 32 cases of mandibular ameloblastoma. Formalin-fixed, paraffinembedded blocks were sectioned and used for haematoxylin & Eosin (H&E) staining. H&E slides were used to re-evaluate the histological types of the ameloblastoma. Immunohistochemical analysis for Ki-67 with a labelled streptavidin-biotin-peroxidase complex technique was performed on tumour sections using Monoclonal Mouse Anti-Human Ki-67 Antigen (clones MIB1, code M7240, Dako Corporation). Lymph nodes (lymphoma) were used as positive control for Ki-67. Results: The specimens comprised 18 cases of Follicular ameloblastoma, 7 cases of Cystic ameloblastoma, 4 cases of plexiform ameloblastoma, and 3 cases of Acanthotic ameloblastoma. The results showed that cellular proliferative activity varied within the ameloblastoma types. There was no statistically significant difference in the Ki-67 Acanthotic, cystic and follicular types of ameloblastoma, while plexiform type showed statistically significantly higher levels than the other 3 types. The mean Ki-67 labelling index of plexiform ameloblastoma ranged from 13 to 30 with a mean of 19.75. The mean values of Ki-67 were statistically significantly higher in recurrent than?non-recurrent cases. Conclusion: The significant expression of Ki-67 could provide useful prognostic markers for proliferative activity and good prognostic indicators for recurrence rate of mandibular ameloblastoma.

关键词： Mandibular Ameloblastoma Recurrence Immunohistochemistry Ki-67

Role of Organic Amendments to Mitigate Cd Toxicity and Its Assimilation in Triticum aestivum L.

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Phyton-International Journal of Experimental Botany 2022年第11期91卷 2491-2504页

作者： Tauqeer Ahmad Yasir Sobia Aslam Muhammad Shahid Rizwan Allah Wasaya Muhammad Ateeq Muhammad Naeem Khan Sikander Khan Tanveer Walid Soufan Basharat Ali Allah Ditta Arpna Kumari Ayman el Sabagh College of Agriculture Bahauddin Zakariya UniversityBahadur Sub-Campus Layyah31200Pakistan Cholistan Institute of Desert Studies The Islamia University of BahawalpurBahawalpur63100Pakistan Directorate General Soil Survey of Punjab Agriculture DepartmentLahore54780Pakistan National Agricultural Research Centre Islamabad44000Pakistan Plant Production Department College of Food and Agriculture SciencesKing Saud UniversityRiyadh11451Saudi Arabia Department of Agricultural Engineering Khwaja Fareed University of Engineering and Information TechnologyRahim Yar Khan64200Pakistan School of Biological Sciences The University of Western AustraliaPerthWA 6009Australia Department of Environmental Sciences Shaheed Benazir Bhutto University SheringalDir(U)Khyber Pakhtunkhwa18000Pakistan Academy of Biology and Biotechnology Southern Federal UniversityRostov-on-Don344006Russia Department of Agronomy Faculty of AgricultureKafrelsheikh UniversityKafr El Sheikh33511Egypt

In soil biota,higher and enduring concentration of heavy metals like cadmium(Cd)is hazardous and associated with great loss in growth,yield,and quality parameters of most of the crop ***,in-situ applications of eco-friendly stabilizing agents in the form of organic modifications have been utilized to mitigate the adverse effects of *** controlled experiment was laid down to appraise the imprints of various applied organic amendments namely poultry manure(PM),farmyard manure(FYM),and sugarcane press mud(PS)to immobilize Cd in polluted ***,phytoavailability of Cd in wheat was also accessed under an alkaline *** revealed that the addition of FYM(5–10 ton ha^(-1))in Cd-contaminated soil significantly increased germination rate,leaf chlorophyll content,plant height,spike length,biological and grain yield amongst all applied organic ***,the addition of FYM(5–10 ton ha^(-1))also reduced the phytoavailability of Cd by 73–85%in the roots,57–83%in the shoots,and 81–90%in grains of wheat ***,it is affirmed that incorporation of FYM(5–10 ton ha^(-1))performed better to enhance wheat growth and yield by remediating ***,the application of FYM(5–10 ton ha^(-1))reduced the toxicity induced by Cd to plants by declining its uptake and translocation as compared to all other applied organic amendments to immobilize Cd under sandy alkaline polluted soil.

关键词： Cadmium toxicity mitigation chlorophyll attributes morphometry yield attributes cereal

Determining the Thermodynamic Properties of Fuel Blends for Use with Air-Fuel Models of IC Engines

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Determining the Thermodynamic Properties of Fuel Blends for ...

Design, Microwave Assisted Synthesis of Some Schiff Bases Derivatives of Congo Red and Conventional Preparation of Their Structurally Reversed Analogous Compounds

International Conference on Emerging Trends in Computer and electronics Engineering(ICETCEE’2012);International Conference on Advancements in electrical and Power Engineering(ICAEPE’2012);International Conference on Trends in Industrial and Mechanical Engineering(ICTIME’2012);International Conference on Advances in Biological and Pharmaceutical Sciences (ICABPS’2012);International Conference on Chemical,Civil and Environment engineering(ICCEE’2012);International Conference on Management,Applied and Social Sciences(ICMASS’2012)

作者： Mohamed M. el-Awad Ali. M. elseory Musaab O. el-Faroug the Mechanical Engineering Department Faculty of Engineering University of Khartoum the Deputy Dean Faculty of Engineering University of Khartoum

The paper presents an Excel-based procedure for determining the coefficients in the polynomials that describe the thermodynamic properties of fuel blends. The procedure, which is meant for use in conjunction with an air-fuel computer model of internal combustion engines, enables the model to deal with fuel blends without modifying the computer program itself. The procedure is applied to determine the coefficients for hydrous ethanol with different water content. The air-fuel model is then used to compare the performance of a spark-ignition engine with hydrous ethanol to that with gasoline and pure ethanol at different engine speeds, pressure ratios, and equivalence ratios.

关键词： Air-fuel models thermodynamic models spark-ignition engines alternative fuels.

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International Journal of Organic Chemistry 2021年第1期11卷 35-45页

作者： Nashwan O. Tapabashi Nihad I. Taha Marwa el-Subeyhi Collage of Pharmacy University of Kirkuk Kirkuk IRAQ Collage of Science University of Anbar Ramadi IRAQ

This work contributes to the improvement of the azo group which has outstanding electron donating capability and serves as excellent ligands in the field of coordination chemistry. The authors of this research deal with the microwave irradiation synthesis of some new Schiff bases derived from the biologically effective and photoactive Congo red [Ia-g]. The design and preparation of the structurally reversed analogous compounds to the above compounds [IIIa-d] were accomplished using the conventional chemical methods by keeping the benzidine moiety of Congo red as the nucleus of the synthesized compounds, doubling the number of the azo groups and inverting the way of their conjugation order with the azomethine groups. The structures of the newly prepared compounds were established on the basis of their FTIR and H1 NMR spectral data.

关键词： Azo-Schiff Congo Red Diazonium Salt Photochemical Conversion Dye Sensitized Solar Cell