|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Analysis of the carbon source for diamond crystal growth显示文摘The lattice constants of diamond and graphite at high pressure and high temperature (HPHT) were calculated on the basis of linear expansion coefficient and elastic constant. According to the empirical electron theory of solids and molecules (EET), the valence electron structures (VESs) of diamond, graphite crystal and their common planes were calculated. The relationship between diamond and graphite structure was analyzed based on the boundary condition of the improved Thomas-Fermi-Dirac theory by Cheng (TFDC). It was found that the electron densities of common planes in graphite were not continuous with those of planes in diamond at the first order of approximation. The results show that during the course of diamond single crystal growth at HPHT with metal catalyst, the carbon sources forming diamond structure do not come from the graphite structure directly. The diamond growth mechanism was discussed from the viewpoint of valence electron structure. | LI Li1,2, XU Bin2,3 & LI MuSen1,2 1 School of Materials Science & Engineering, Shandong University, Jinan 250061, China 2 Shandong Engineering Research Center for Super Hard Materials, Zoucheng 273500, China 3 School of Materials Science & Engineering, Shandong Jianzhu University, Jinan 250101, China | 2008 | Chinese Science Bulletin2008，53，6： | 6 |
| 2 | Tensile properties and fracture behavior of Ti_2AlNb based alloys at room temperature显示文摘The tensile mechanical properties and fracture behaviors of Ti 22Al 20Nb 7Ta alloys were studied at room temperature. Three typical microstructures of Ti 2AlNb based alloys were obtained by combination of thermal mechanical processing and heat treat ment. They are: 1) lath mixture of O + B 2 with remaining β grain boundaries and α 2 phase; 2) equiaxed O phase in B 2 matrix; 3) fine lath mixture of O + B 2 without remaining β grain boundaries. It is shown that the microstructure obviously affects the tensile properties of Ti 2AlNb based alloys. The microstructure of fine lath mixture of O + B 2 without remaining β grain boundaries has good combination of yield stress and ductility, while the microstructure with lath mixture of O + B 2 with remaining β grain boundaries and α 2 phase has low yield stress and elongation. The fracture mode was also controlled by the microstructure of Ti 2AlNb based alloys. By means of SEM, it was found that the dominated fracture mode of microstructure with lath mixture of O + B 2 with remained β grain boundary and α 2 phase was intergranular, and the fracture mode of the other two microstructures was mainly transgranular. | PENG Ji hua(彭继华) 1, 2 , MAO Yong(毛 勇) 2, LI Shi qiong(李世琼) 2, SUN Xun fang(孙训方) 2 1. Department of Engineering Mechanics, Southwest Jiaotong University, Chengdu 610031, P.R.China 2. Division of Super Alloys, Central Iron and S | 2000 | 中国有色金属学会会刊:英文版2000，10，3： | 6 |
| 3 | Current concepts in the management of bisphosphonate associated atypical femoral fractures显示文摘Bisphosphonates are a class of drugs used as the mainstay of treatment for osteoporosis.Bisphosphonates function by binding to hydroxyapatite,and subsequently targeting osteoclasts by altering their ability to resorb and remodel bone.Whilst aiming to reduce the risk of fragility fractures,bisphosphonates have been associated with atypical insufficiency fractures,specifically in the femur.Atypical femoral fractures occur distal to the lesser trochanter,until the supracondylar flare.There are a number of the differing clinical and radiological features between atypical femoral fractures and osteoporotic femoral fractures,indicating that there is a distinct difference in the respective underlying pathophysiology.At the point of presentation of an atypical femoral fracture,bisphosphonate should be discontinued.This is due to the proposed inhibition of osteoclasts and apoptosis,resulting in impaired callus healing.Conservative management consists primarily of cessation of bisphosphonate therapy and partial weightbearing activity.Nutritional deficiencies should be investigated and appro-priately corrected,most notably dietary calcium and vitamin D.Currently there is no established treatment guidelines for either complete or incomplete fractures.There is agreement in the literature that nonoperative management of bisphosphonate-associated femoral fractures conveys poor outcomes.Currently,the favoured methods of surgical fixation are cephalomedullary nailing and plate fixation.Newer techniques advocate the use of both modalities as it gives the plate advantage of best reducing the fracture and compressing the lateral cortex,with the support of the intramedullary nail to stabilise an atypical fracture with increased ability to load-share,and a reduced bending moment across the fracture site.The evidence suggests that cephalomedullary nailing of the fracture has lower revision rates.However,it is important to appreciate that the anatomical location and patient factors may not always allow for this.Although causation between bisphosphonates and atypical fractures is yet to be demonstrated,there is a growing evidence base to suggest a higher incidence to atypical femoral fractures in patients who take bisphosphonates.As we encounter a growing comorbid elderly population,the prevalence of this fracture-type will likely increase.Therefore,it is imperative clinicians continue to be attentive of atypical femoral fractures and treat them effectively. | Branavan Rudran Jonathan Super Rajan Jandoo Victor Babu Soosai Nathan Edward Ibrahim Anatole Vilhelm Wiik | 2021 | World Journal of Orthopedics2021，12，9： | 2 |
| 4 | Laparoscopic sigmoid colectomy: total laporascopic approach显示文摘 | Darzi A Super P Guillou PJ | 1994 | Dis Colon Rectum1994，37，： | 1 |
| 5 | Oause and prevention of electrosuygical injuries in laparoscopy显示文摘 | Nduka CC Super PA Monson JR | 1994 | J Am Coil Surg1994，179，2： | 1 |
| 6 | A theory of vocational development 显示文摘 | Super D E | 1953 | American Psychologist1953，，8： | 1 |
| 7 | A theory of vocational development显示文摘 | I Super D E | 1953 | American psychologist1953，8，5： | 1 |
| 8 | Patch-based stereo in general binocular Viewing 显示文摘 | Super B J Kiariaquist W N | 1997 | Theory and Experiment PAMI (S0162-8828)1997，19，3： | 1 |
| 9 | Shape from texture using local spectral moments显示文摘 | SUPER B J BOVIK A C | 1995 | IEEE Transactions on Pattern Analysis and Machine Intelligence1995，17，4： | 1 |
| 10 | Pre- dicting outcome, in neonatal hypoxic respiratory fail- ure with the score for neonatal acute physiology (SNAP) and highest oxygen index (OI) in the first 24 hours of admission显示文摘 | KUMAR D SUPER D M FAJARDO R A | 2004 | J Perinatol2004，24，： | 1 |
| 11 | The fundamentals of laparoseopic surgery: its time has come显示文摘 | Super NJ Fried GM | 2008 | Bull Am Coll Surg2008，93，9： | 1 |
| 12 | A theory of vocational development显示文摘 | Super E | 1953 | American Psychologist1953，，8： | 1 |
| 13 | Distribution of cholinergic neurons in rat brain : demonstrated by the immuno-cytochemical localization of choline acetyltransferase显示文摘 | Armstrong D M Super C B Levey A I | 1983 | Comp Neurol1983，216，1： | 1 |
| 14 | Rubber toughening of poly(lactide)by blending and block copolymerization显示文摘 | Grijpma D W Van Hofslot R D A Super H | 1994 | J Polym Sci Eng1994，34，： | 1 |
| 15 | Transition: Trom vocational guidance to counseling psychology显示文摘 | Super D E | 1957 | Journal of Counseling Psychology1957，，2： | 1 |
| 16 | Vitamin K status of premature infants:implications for current recommendations显示文摘 | Kumar D Greer F R Super D M | 2001 | Pediatrics2001，108，5： | 1 |
| 17 | Distraction osteogenesis in the treatment of dentofacial deformities显示文摘 | Super S | 2009 | Alpha Omegan2009，102，2： | 1 |
| 18 | Rearrangements of the MLL gene in therapy-related acute myeloid leukemia in patients previously treated with agents targetiug DNA-topoiso-merase I 显示文摘 | Super H J McCabe N R Thirman M J | 1993 | Blood1993，82，： | 1 |
| 19 | A Life-Space Approach to Career Development显示文摘 | Super DE | 1980 | Journal of Occupational Psychology1980，16，3： | 1 |
| 20 | A life-span, life-space approach to career development 显示文摘 | Super D E | 1980 | Journal of Vocational Behavior1980，16，： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员