Nexus between natural and technical disaster shocks,resource depletion and growth-specific factors: evidence from quantile regression     

Akhter  Waseem  Zaman  Khalid  Nassani  Abdelmohsen A.  Abro  Muhammad Moinuddin Qazi 《Natural Hazards》2020,101(1):143-172

Natural Hazards - Debris flows are a hazardous natural calamity in mountainous regions of Nepal. Torrential rainfall within a very short period of the year is the main triggering factor for...  相似文献   

An Acheulian site near Bir Kiseiba in the Darb el Arba'in Desert,Egypt     

C. Vance Haynes  T. A. Maxwell  A. El Hawary  K. A. Nicoll  S. Stokes 《Geoarchaeology》1997,12(8):819-832

A small concentration of Acheulian cleavers and handaxes within the driest region on Earth adds to the increasing evidence that the eastern Sahara was considerably more verdant during the Middle Pleistocene than it is today. The similarities to stone artifact assemblages of Acheulian sites in sub-Saharan Africa and in the Levant support the evidence for the movement of hominids, utilizing the Kombewa lithic technology, between Africa and the Middle East during the Middle Pleistocene. © 1997 John Wiley & Sons, Inc.  相似文献   

Effects of Dietary Protein Level on Growth and Utilization of Protein and Energy by Juvenile Mangrove Red Snapper (Lutjanus argentimaculatus )   总被引：1，自引：1，他引：0  

Ghulam Abbas  Khalid Jamil  Rukhsana Akhtar 《中国海洋大学学报(英文版)》2005,4(1)

1Introduction The mangrove red snapper,Lutjanus argentimacu-latus(Forsskal,1775)is a carnivorous,warm-watereuryhaline fish that is considerably cultured in South-east Asia,Southern China and the Middle East(Le-ung et al.,1999;Estudillo et at.,2000;Ng et al.,2000;Catacutan et al.,2001).In Pakistan,it isknown for its good quality meat and also for its highconsumption rate.Although it fetches a premiumprice at local markets(Anonymous,2002),the in-creasing demand has generated interest towar…  相似文献   

Field behavior of pre-bored grouted planted nodular pile embedded in deep clayey soil     

Zhou  Jia-jin  Gong  Xiao-nan  Zhang  Ri-hong  Hesham El Naggar  M.  Wang  Kui-hua 《Acta Geotechnica》2020,15(7):1847-1857

Acta Geotechnica - This paper presents the results of field tests performed to investigate the behavior of pre-bored grouted planted nodular (PGPN) pile embedded in deep clayey soil. The test piles...  相似文献   

Hydrothermal alteration of plagioclase in granitic rocks from Proterozoic basement of SE Sweden     

S. Morad  M. A. K. El‐Ghali  M. A. Caja  M. Sirat  K. Al‐Ramadan  H. Mansurbeg 《Geological Journal》2010,45(1):105-116

Petrographic examinations and electron microprobe analyses of Proterozoic granitic rocks, SE Sweden aimed to characterize and unravel the mechanisms and conditions of plagioclase alterations. These alterations include saussuritization, albitization and replacement of plagioclase by K‐feldspar. The hydrothermal alterations, which are inferred to have occurred at ca. 250–400°C, resulted in concomitant formation of Al‐rich titanite, epidote, calcite, pumpellyite, prehnite and iron oxides. Replacement of plagioclase by K‐feldspar occurs in red‐stained zones, which have developed close to thin fractures owing to the precipitation of tiny Fe‐oxide pigment particles within the altered plagioclase, whereas saussuritized plagioclase has less systematic spatial relationships to these fractures. Albitization of plagioclase occurred in rocks that are poor in biotite compared to rocks that suffered extensive saussuritization. The chemical and textural characterization of various types of plagioclase alterations allows elucidation of the granitic hydrothermal systems. Features of feldspar alteration in the granitic rocks are similar to those encountered in feldspathic sandstones and should hence be considered in studies on diagenetic changes of siliciclastic successions during basin evolution. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

Analytical solution for distributed torsional low strain integrity test for pipe pile     

Yunpeng Zhang  Guosheng Jiang  Wenbing Wu  M. Hesham El Naggar  Hao Liu  Minjie Wen  Kuihua Wang 《国际地质力学数值与分析法杂志》2022,46(1):47-67

Low strain integrity tests (LSITs) are the most popular non-destructive methods for pile testing. However, traditional LSITs have encountered unprecedented challenges as the need for long pile and existing pile testing keeps multiplying. Compared to traditional longitudinal excitations, the torsional wave is less influenced by the velocity attenuation effect and can be subjected at the pile shaft for existing piles. Distributed torsional LSIT is proposed in this article with the presentation of the corresponding analytical solutions that exhibiting the velocity responses along the pile shaft. The solution is verified with previous simplified theoretical and rigorous finite element method (FEM) answers. At the end, the application of this method is exhibited through the identification of necking and concrete segregation defects on pipe piles, which shows the advantage of this method on long pile testing.  相似文献