In recent years, with the gradual implementation of the central government’s policy of expanding domestic demand, the living standards of urban residents have been greatly improved. With the increasing level of urban living consumption, residents’ living consumption situation has attracted more attention and attention. In order to further increase the consumption income of households, it is necessary to conduct corresponding analysis on households in various regions. Based on SPSS statistical simulation software, this paper uses factor analysis and clustering methods often used in modern multivariate economic statistical analysis to establish multivariate statistical models and calculate and establish various analysis models suitable for my country’s household consumption expenditure structure (2020) and analyze the parameters, accordingly. From the perspectives of politics, economy, geography, etc., this paper reveals the changes in energy consumption in China’s family and social life and its possible implied related information, laws, directions, and the overall development level of society. Through empirical analysis and research, this paper can finally conclude that the current consumption expenditure structure of Chinese households is affected by a combination of factors such as national policies, economic development and technical conditions, and geographical environment characteristics, and the effect is different in different cities.

Appendiceal endometriosis with intestinal metaplasia is particularly challenging to diagnose preoperatively based on clinical features. Microscopically, it can mimic malignant transformation into mucinous neoplasms of the appendix. The present study reports a case of a 47-year-old woman who presented with abdominal pain that was not related to her menstruation. The preoperative diagnosis and laparoscopic evaluation were chronic appendicitis. No mucinous or haemorrhagic secretions were present within the abdominal cavity. Pathological evaluation revealed conventional endometriosis with intestinal-type metaplasia of the epithelium. An inverse pattern of cytokeratin (CK)7, paired-box 8, estrogen receptor, CK20, caudal type homeobox transcription factor 2 and mucin 2 immunoreactivity between intestinal-type and endometrial-type endothelium was observed. Infiltration and replacement of the appendiceal wall by marked levels of acellular mucin, a lack of stromal components and a DNA mismatch repair protein profile were vital in diagnosing appendiceal endometriosis without appendiceal mucinous neoplasms (AMNs). The lesion of appendiceal endometriosis are usually superficial and small in previously reported cases but was deeply invasive in our case. A careful histopathological examination is necessary for diagnosing and distinguishing the histologic imitators of AMN.

No abstract

Aiming at the problems of strong nonlinearity, high dynamics and strong disturbance during the return process of reusable launch vehicles, this paper proposes a model prediction control method based on time-varying prediction model and disturbance observer. Firstly, the principles of predictive function control and disturbance observer are introduced. Then the time-varying prediction model is used to predict the state of the system to overcome the problem of high dynamics of the system; the disturbance observer is introduced to overcome the problem of strong disturbance of the system, the deviation between the real system and the prediction model is observed, and the compensation is made in real time at the input end. By solving the quadratic optimization problem, an explicit solution to the control input is obtained. Simulation results show that the control quality of the control method is very good and the method has strong robustness.