[en] The time-dependant fracture behaviors of Ti-24Al-14Nb-3V-0.5Mo alloy, i.e., high cycle fatigue (HCF) at room temperature, cyclic notch stress rupture at 650 deg. C were studied. Microstructure and fractograph were examined by means of scanning electron microscope using back scattered electron image and secondary electron image, respectively. The HCF limit of Ti-24Al-14Nb-3V-0.5Mo alloy at room temperature is 670 MPa. O phase precipitation in continuous B2 matrix is beneficial to improve the fatigue limit of Ti-24Al-14Nb-3V-0.5Mo alloy. Limited step of HCF behavior is crack initiation controlling. Effect of stress level on the cyclic notch stress rupture life is stronger than that of notch radii. In the peripheral zone, high temperature crack fatigue growth is the dominant mechanism, while in the middle zone, creep void growth-linkage is the dominant mechanism

[en] Unit merging and disassembly refers to merging one or more sections of a process unit into adjacent units or disassembling them back to the unit according to process control requirements in order to ensure high quality and efficient production of products under different process operation conditions. According to the design requirement of unit merging and disassembly in special project, taking ECS-700 DCS control system as the platform, combining with process flow and control requirement, this paper designs control model, carries out software and hardware configuration design, analyses the configuration difficulty of unit merging and disassembly, studies control module, designs man-machine interface, completes debugging and verification, and realizes large-scale production for the first time. The configuration design in this paper has been verified by field debugging and meets the requirements of process control. The system runs reliably and steadily. It can provide a useful reference for the design of similar plant control system. (author)

[en] Influenced by many factors, such as the development of social economy, the increase of population, the shortage of natural resources such as land, and the reform of science and technology, large and super large construction projects have become the mainstream of contemporary engineering construction. At the same time, higher requirements are put forward for the management of the project site. Standardized, scientific, quality and refined management is the inevitable trend of the development of modern project management, and intelligent network technology is the inevitable technical condition for realizing the change of project management. (author)

[en] The bag constant and the size increment of a nucleon (soliton) embedded in nuclear medium, are calculated in a non-topological soliton model. These results may be understood as arising from the change of the vacuum properties in the presence of the dense nuclear medium. The calculated quantities are in reasonable agreement with the empirical values

[en] We find there are at least two different steady states for transport across noncollinear magnetic multilayers. In the conventional one there is a discontinuity in the spin current across the interfaces which has been identified as the source of current induced magnetic reversal; in the one advocated here the spin torque arises from the spin accumulation transverse to the magnetization of a magnetic layer. These two states have quite different attributes which should be discerned by current experiments

[en] Both bilayer and multilayer samples are bombarded at room temperature with Xe⁺(300 keV) or Ar⁺(90-120 keV) for the doses of 1 x 10¹⁵-1 x 10¹⁷ cm^-2. AES, XPS and RBS are used for the depth profiling of compositions. TEM observations are also carried out on multilayer samples. It is found that ion beam mixing occurs in cascade regime Q ∝ Φ^1/2 for the multilayers and effective Dt ∝ Φ^1/2 for the bilayers, respectively. Nonuniform mixing is observed in multilayers, particularly with Xe⁺ bombardment, which is consistent with the calculations of the deposited energy density distribution. Metastable β-Ti-Mo solid solution of bcc structure is formed after mixing. Impurities such as C, O significantly suppress the mixing and are also redistributed during ion bombardment

[en] Ti₂AlNb orthorhombic phase based alloys are the promising high temperature structural materials for aeronautical and aerospace industry because of their low density, high yield strength and excellent high temperature performance. In this paper, the recent work which has been carried out in CISRI on alloy and process of Ti₂AlNb based alloys is presented. The work covers the development of the alloy design and microstructure control as well as the processing technology applied for producing good quality alloy ingots and fabricating various components. The progress obtained in application research of the alloys is addressed. The important role that the combination of TMP and the post-TMP treatment affects on the microstructure and thus on the properties of the alloys is emphasized. (orig.)

[en] Objective: To investigate introvoxel incoherent motion (IVIM) sequence features of cervical cancer and to analyze the difference between cervical cancer and normal cervix by using biexponential model parameters of IVIM sequence. Methods: MR imaging data of 26 patients with cervical cancer confirmed by surgical pathology and 26 patients of normal cervical confirmed by clinical or MR examination were analyzed retrospectively. All patients underwent routine pelvic MRI sequences, including T₁WI, T₂WI, DWI (b = 800 s/mm²) and IVIM sequence. The IVIM sequence was applied using a biexponential model with factors from 0 to 1200 s/mm². The standard ADC, slow ADC, fast ADC and fraction of fast ADC values of cervical cancer and normal cervix groups were measured and analyzed by using t test. Diagnostic efficacy of these parameters in cervical cancer group was evaluated by using area under the curve. Results: The standard ADC, slow ADC, fast ADC and fraction of fast ADC of cervical cancer group were (0.47 ±0.09) × 10^-3 mm²/s, (0.45 ± 0.09) × 10^-3 mm²/s, (5.00 ± 1.68) × 10^-3 mm²/s, 0.30 ± 0.06 and those of normal cervical group were (0.77 ± 0.15) × 10^-3 mm²/s (0.61 ± 0.06) × 10^-3 mm²/s, (4.29 ± 0.57) × 10^-3 mm²/s and 0.44 ± 0.04, respectively. The differences of standard ADC, slow ADC value and fraction of fast ADC value between two groups were statistically significant (t = 8.841, 7.540, 10.591, P < 0.01 respectively). There was no difference of fast ADC between the two groups (t = 0.120, P > 0.05). The area under the curve of fraction of fast ADC was the maximum, and it may be the most valuable parameter for the diagnosis of cervical cancer. Conclusions: Cervical cancer group has characters on IVIM with lower standard ADC, slow ADC and fraction of fast ADC compared with the normal cervix group. IVIM sequence can reflect diffusion and perfusion of cervical cancer quantitatively. It may play a complementary role in the diagnosis and has some application prospects. (authors)

[en] Vitamin C is a nutrient component in fruits and vegetables, it's also an important bioactive substance in human body, and there are also many factors that affect the contents of vitamin C in fruits and vegetables. There papers reported that ⁶⁰Co γ-rays irradiation has effects on vitamin C in fruits and vegetables, but the effect degree has some differences. Some reports says the contents of vitamin C in fruits and vegetables could be significantly reduced by irradiation, while some literatures reported that irradiation at low doses had no significant effect. The content of vitamin C in fruits and vegetables could be influenced by various factors, such as ascorbic oxidative enzyme, chemical composition, irradiation dose, irradiation environment, physiological metabolism of fruits and vegetables, etc. Irradiation treatment is an important preservation technique of fruits and vegetables. Though there were some effects of irradiation on vitamin C of fruits and vegetables, it would not influence the applications of irradiation technology in the fruit and vegetable storage, because the effects of irradiation on vitamin C could be avoided or minimized through appropriate technical treatment. This paper tries systematically analyses and summarizes the results of related investigation and provides a helpful reference in scientific applications of irradiation technology on fruits and vegetables preservation. (authors)

[en] The dimensional regularization approach in the operator representation of the Dirac algebra defined in the extended Grassmann space is applied to investigate the properties of the π-meson mode in the Nambu-Jona-Lasinio model. It is shown that the analytic formula for hadronic modes in the Nambu-Jona-Lasinio model as well as the numerical results which fit the experimental data can be obtained by employing this method