The detection of crane braking descent distance faces numerous challenges in practical engineering applications, primarily due to limitations in the measurement accuracy of existing detection equipment, the complexity of on?site operations, and high equipment costs. A method is proposed to obtain the braking descent distance by using inertial sensors to collect acceleration and angular velocity data during the crane braking process, performing attitude calculation, and combining it with a double integration algorithm. First, a Lagrangian dynamic model of the crane is established to analyze the coupling relationship between the braking descent distance and the equipment environment. Second, a data acquisition device is designed, the detection steps are described, and data synchronous transmission is employed to enhance signal reliability. Finally, the data processing method is investigated, a complete data processing workflow is designed, complex integration algorithms are compared and analyzed, and practical feasibility is verified. The results indicate that this detection method can prevent serious accidents such as load dropping caused by insufficient braking performance, offering superior comprehensive performance, strong feasibility, and promising market prospects.

The spinel?phase Zn₂Ga_2.98-x Ge_0.75O₈:Cr_0.02, La _x (x=0.005,0.010,0.015,0.020,0.025) nanoparticles were synthesized by a hydrothermal method in combination with a subsequent heat treatment. With the La³⁺ doping concentration increasing from 0 to 0.025, the average particle size of these nanoparticls increased from 64 nm to 78 nm. Under 590 nm excitation, La³⁺?doped ZGGO nanoparticles exhibited stronger narrow?band NIR emission peaked at 697 nm, originating from the ²E(²G)→⁴A₂(⁴F) transition of Cr³⁺. From the TEM and emission spectral analyses, it can be found that the increased NIR persistent luminescence is attributed to the increased particle size and the increased number of luminescent centers in a relatively strong crystal field environment. On the basis of thermoluminescence spectra and the afterglow decay curves, it can be found that La³⁺ doping leads to the formation of more traps related to the thermal activation process and the afterglow time exceeding 15 h.

In this study, the optical properties of 3D carbon ball were theoretically investigated by using Density?Functional Theory (DFT) and wave function analysis. The electron?leaping mechanism in the Ultraviolet?visible (UV?vis) absorption spectrum was investigated. The electronic excitation properties of 3D carbon ball were investigated by Transition Density Matrix (TDM) and Charge Density Difference (CDD). Raman spectra were calculated and the vibrational modes of the 3D carbon ball were further explained. Meanwhile, the interaction between 3D carbon ball and the external environment was investigated using Electrostatic Potential (ESP), and the degree of electron delocalization of 3D carbon ball was investigated based on the magnetic induction current under the applied magnetic field.It is shown that the absorption spectra of three?dimensional carbon spheres are mainly in the ultraviolet region and that they have a strong electron delocalization capability. This study can provide a theoretical basis for the application of other 3D π?conjugated molecular structures in linear and nonlinear optics.

This paper uses Aspen Plus software to carry out steady?state simulations of a new process for the reactive distillation of hydrogen peroxide isopropylbenzene (CHP) and subsequent refining processes for phenol and acetone. The operating pressure, feed position and number of plates of the reactive distillation column and the refining process were economically optimised with the objective of minimising the total annual cost (C_TAC). The results show that the optimal operating parameters of the process are as follows : the total number of trays of RD was 34, the number of trays in the distillation section was 27, the number of trays in the reaction section was 6, the feed position was 28, and the operating pressure was 3.0×10⁴ Pa. The total plate numbers of acetone refining tower (T101), cumene top tower (T102), tar tower (T103) and phenol refining tower (T104) were 25, 61, 23 and 22, respectively. The feed positions are 16, 45, 9 and 9, respectively. The operating pressures were 5.2×10⁴, 5.0×10³, 5.5×10⁴, 6.0×10³ Pa. The minimum C_TAC of the new process was 2 239.03×10⁴ yuan/year. At the same time, the steady?state simulation and economic optimization of the traditional CHP decomposition and subsequent phenol and acetone refining process were also carried out, and the minimum C_TAC value was 2 608.13×10⁴ yuan/year. By comparing the reactive distillation process with the traditional process, it can be seen that C_TAC can save 14.15% and energy consumption can save 9.01%.

The difference between COM object and object module of .NET framework was elaborated. And the interoperation realization method between COM and .NET while COM as the server and .NET as the client, and con the contrary while .NET as the server and COM as the client was respectively narrated. Calling COM component in unmanaged code (.NET code) and .NET component in managed code was realized by taking advantage of runtime callable wrapper RCW and COM callable wrapper CCW. Thus, in the situation of the .NET technical maturing, programming of using the COM technology will much less than before. But the COM technology would not be completely replaced by .NET in the near future. So a great deal of existent products which are developed using COM component technology are protected and used through realizing the interoperation between the COM and the .NET technology, which also makes the COM programmers use easily the software based on the .NET technology.

Along with wide application of e-mail nowadays, a large number of spam flood into people’s life and bring catastrophe to their work and study. Now new spam is changeable which makes traditional and single method for anti-spam powerless. In response to this problem, three popular spam filtering technologies were introduced, which have been implemented on spam filtering field. After analyzing their advantages and disadvantages, The white and black lists technology, Rule-based filtering technology and Bayesian filtering technology to make the best use of the advantage of these algorithms were integrated. Consequently a layered spam filtering system model was set up, and the performance analysis of the system was made.