共查询到18条相似文献，搜索用时 406 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
本文针对现有阵列声波测井仪器,对井旁不同角度和不同位置井旁地质界面的全波波列进行了物理和数值模拟。结果表明,在现有仪器源距范围内,可以从全波波形中观测到清晰的反射纵波。在此基础之上,针对阵列声波全波数据特点,对Stolt的f-k偏移方法进行了改进,使其更适应于阵列声波测井需要,该方法不受地质界面倾角的限制,而且一次可以有效地处理大量现场数据,可以分别得到上倾和下倾井旁地质界面图像。最后,应用该方法对一个倾斜井的阵列声波数据进行了处理,有效的得到了井旁地层界面成像图,验证了该方法的可靠性。 相似文献
15.
以PVC树脂和增塑剂邻苯二甲酸二辛酯(DOP)混合制备热固印花浆,主要探讨了增塑剂的用量、焙烘温度、焙烘时间对热固印花浆应用性能的影响.通过单因素分析可得制备最佳工艺为DOP用量选用范围在11.5mL～12.5mL之间(PVC树脂用量20g),最佳温度和时间是145℃和2min. 相似文献
16.
《清华大学学报》2013,(6):588-598
The API interfaces provided by CUDA help programmers to get high performance CUDA applications in GPU, but they cannot support most I/O operations in device codes. The characteristics of CUDA＇s mapped memory are used here to create a dynamic polling service model in the host which can satisfy most I/O functions such as read/write file and ＂printf＂. The technique to implement these I/O functions has some influence on the performance of the original applications. These functions quickly respond to the users＇ I/O requirements with the ＂printf＂ performance better than CUDA＇s. An easy and effective real-time method is given for users to debug their programs using the I/O functions. These functions improve productivity of converting legacy C/C＋＋ codes to CUDA and broaden CUDA＇s functions. 相似文献
17.
Stoichiometric pure and tellurium (Te) doped indium bismuthide (InBi) were grown using the directional freezing technique in a fabricated furnace. The X-ray diffraction profiles identified the crystallinity and phase composition. The surface topographical features were observed by scanning electron microscopy and atomic force microscopy. The energy dispersive analysis by X-rays was performed to identify the atomic proportion of elements. Studies on the temperature dependence of dielectric constant (?), loss tangent (tanδ), and AC conductivity (σac) reveal the existence of a ferroelectric phase transition in the doped material at 403 K. When InBi is doped with tellurium (4.04 at%), a band gap of 0.20 eV can be achieved, and this is confirmed using Fourier transform infrared studies. The results thus show the conversion of semimetallic InBi to a semiconductor with the optical properties suitable for use in infrared detectors. 相似文献
18.
Subsurface macro-inclusions and solidified hook character in aluminum-killed deep-drawing steel slabs 
下载免费PDF全文
下载免费PDF全文 Xiao-xuan Deng Lin-ping Li Xin-hua Wang Yun-qing Ji Chen-xi Ji Guo-sen Zhu 《矿物冶金与材料学报》2014,21(6):531-543
Subsurface macro-inclusions and hooks are detrimental to the surface quality of deep-drawing steel sheets. However, little is known about the relationship between macro-inclusions and hooks. Thus, in this work, two ultralow carbon (ULC) steel slabs and two low carbon (LC) aluminum-killed steel slabs were sampled to study the relationship between hooks and subsurface macro-inclusions, which were detected on the cross-sections of steel samples with an area of 56058 mm2 using an automated scanning electron microscopy/energy-dispersive X-ray spectroscopy system. Results show that subsurface inclusions larger than 200 μm were almost entrapped by hook structures, whereas the location of other inclusions smaller than 200 μm had no obvious dependence on the location of solidified hooks. Furthermore, the number density (ND) of subsurface inclusions larger than 200 μm decreased from 0.02 to 0 cm-2 in ULC steel as the mean hook depth decreased from 1.57 to 1.01 mm. Similar trends were also observed in LC steel. In addition, the detected inclusions larger than 200 μm were concentrated in the region near the slab center (3/8 width-5/8 width), where hook depths were also larger than those at any other locations. Therefore, minimizing the hook depth is an effective way to reduce inclusion-induced sliver defects in deep-drawing steels. 相似文献