无焊接螺栓球结点网架的施工实践

本文分析了目前日渐兴起的网架结构候车大厅的施工方式，并对阶梯形满堂红脚手架拼装法做了详细介绍。

引江济汉通航工程高石碑船闸球结点弧形三角门安装工艺浅析

本文介绍引江济汉通航工程高石碑船闸球结点弧形三角门安装工艺方法，主要质量控制措施。

我省高等级公路收费栅门设计浅谈

作者对黑龙江省高等级公路收费栅门的设计进行了简要分析，总结了经验教训，指出了不足，提出了改进意见，并在哈大高速公路建设中进行了完善和新的探索。

Differences between diffuse and focal autoimmune pancreatitis

AIM:To investigate differences in clinical features between diffuse-and focal-type autoimmune pancreatitis(AIP).METHODS:Based on radiological findings by computed tomography and/or magnetic resonance imaging,we divided 67 AIP patients into diffuse type(D type) and focal type(F type).We further divided F type into head type(H type) and body and/or tail type(B/T type) according to the location of enlargement.Finally,we classified the 67 AIP patients into three groups:D type,H type and B/T type.We compared the three types of AIP in terms of clinical,laboratory,radiological,functional and histological findings and clinical course.RESULTS:There were 34 patients with D-type,19 with H-type and 14 with B/T-type AIP.Although obstructive jaundice was frequently detected in D-typepatients(88%) and H-type patients(68%),no B/T-type patients showed jaundice as an initial symptom(P < 0.001).There were no differences in frequency of abdominal pain,but acute pancreatitis was associated more frequently in B/T-type patients(36%) than in D-type patients(3%)(P = 0.017).Serum immunoglobulin G(IgG)4 levels were significantly higher in D-type patients(median 309 mg/dL) than in B/T-type patients(133.5 mg/dL)(P = 0.042).Serum amylase levels in B/T-type patients(median:114 IU/L) were significantly greater than in H-type patients(72 IU/L)(P = 0.049).Lymphoplasmacytic sclerosing pancreatitis(LPSP) was histologically confirmed in 6 D-type,7 H-type and 4 B/T-type patients;idiopathic duct-centric pancreatitis was observed in no patients.Marked fibrosis and abundant infiltration of CD20-positive B lymphocytes with few IgG4-positive plasma cells were detected in 2 B/T-type patients.Steroid therapy was effective in all 50 patients(31 D type,13 H type and 6 B/T type).Although AIP relapsed during tapering or after stopping steroids in 3 D-type and 3 H-type patients,no patients relapsed in B/T type.During follow-up,radiological features of 6 B/T-type patients were not changed and 1 B/T-type patient improved naturally.CONCLUSION:Clinical features of H-type AIP were similar to those of D-type,but B/T-type differed from D and H types.B/T-type may involve diseases other than LPSP.

Spectrum and Binding Energy of an Off-Center Hydrogenic Donor in a Spherical Quantum Dot

Off-center impurity effects in a spherical quantum dot are theoretically studied by degenerate perturbationmethod in strong confinement.The energy levels and binding energies are computed for the typical GaAs material asfunction of the donor position.The numerical results show the quantum size effect.We note that the energy levels andbinding energies are not only related to the position of donor and the strength of confinement,but also related to thefold of degenerate states.We can see obviously that gaps will appear among the degenerate states and the splitting ofenergy levels and binding energies will appear as the position of the impurity is shifted away off the center.

Binding Energy of an Off-Center D^-in a Spherical Quantum Dot

Using the method of matrix diagonalization, we investigate an off-center D^- in a spherical quantum dot （QD） subjected to a parabolic potential confinement. We discuss the effect of the position of an impurity in the QD on the binding energy of the D system, Eurthermore, we compare a negatively charged donor D^- with a neutral donor DO confined by a spherical QD with a parabolic potentiM. The results have clearly demonstrate the so-called quantum size effect. The binding energy is dependent on the confining potential hw0 and the impurity ion distance D.

Effects of hydrostatic pressure and external electric field on the impurity binding energy in strained GaN/Al_xGa_(1-x)N spherical quantum dots

The binding energy and Stark effect energy shifts of a shallow donor impurity state in a strained GaN/AlxGa1-xN spherical finite-potential quantum dot (QD) are calculated using a variational method based on the effective mass approximation. The binding energy is computed as a function of dot size and hydrostatic pressure. The numerical results show that the binding energy of the impurity state increases, attains a maximum value, and then decreases as the QD radius increases for any electric field. Moreover, the binding energy increases with the pressure for any size of dot. The Stark shift of the impurity energy for large dot size is much larger than that for the small dot size, and it is enhanced by the increase of electric field. We compare the binding energy of impurity state with and without strain effects, and the results show that the strain effects enhance the impurity binding energy considerably, especially for the small QD size. We also take the dielectric mismatch into account in our work.

Sharp scattering spectra induced brilliant and directional structural colors

Structural color materials,which generate colors through the interaction between light and nano-microstructures,have always been research hotspots in the fields of display,anticounterfeiting and stimuli-responsive materials.Structural colors based on scattering have received increasing attention due to their wider viewing angles than that originating from the specular reflection of photonic crystals.However,the wide scattering spectrum of an amorphous structure leads to lower purity and brightness of the appeared colors.Few researchers have focused on the scattering of ordered structures due to their strong reflection and diffraction in the visible regions.In this work,by building ordered films(OFs)using SiO2 spheres(refractive index n=1.46)with a diameter of 300–500 nm,for the first time,sharp scattering spectra with narrow full width at half-maximum(FWHM,24 nm)were generated.Importantly,under ambient light,brilliant colors covering the entire visible region can be observed,and a formula was proposed to calculate the scattering spectra of OFs.Moreover,rainbow structural color was realized under irradiation of the nonparallel light,and full-spectrum structural color patterns were fabricated using building blocks with a single particle size by a spraying method.Finally,a composite structure was constructed to explore possibilities in the field of flexible transparent displays.

Ignition of neutrino-dominated accretion disks

The vertical structure of neutrino-dominated accretion flows （NDAFs） in spherical coordinates is revisited. We define the ratio of the neutrino cooling rate to the viscous heating rate per unit volume, f=-qJqvis. The ignition region is presented when f〉0.5. The solutions show that NDAF is significantly thick. The ignition region is determined by the mass accretion rate and the vis- cosity parameter, which can be considered as the neutrino radiation-dominated region.