Building the Green Industry in Qaidam Basin on the Basis of Multidiscipline Studies of Salinology

Thanks to the efforts on prospecting and exploiting of salt lakes,new cities and towns have grown up in Qaidam Basin,which used to be untraversed deserts and saline and alkaline lands.And these progress have made great

Distributed collaborative extremum response surface method for mechanical dynamic assembly reliability analysis

To make the dynamic assembly reliability analysis more effective for complex machinery of multi-object multi-discipline(MOMD),distributed collaborative extremum response surface method(DCERSM)was proposed based on extremum response surface method(ERSM).Firstly,the basic theories of the ERSM and DCERSM were investigated,and the strengths of DCERSM were proved theoretically.Secondly,the mathematical model of the DCERSM was established based upon extremum response surface function(ERSF).Finally,this model was applied to the reliability analysis of blade-tip radial running clearance(BTRRC)of an aeroengine high pressure turbine(HPT)to verify its advantages.The results show that the DCERSM can not only reshape the possibility of the reliability analysis for the complex turbo machinery,but also greatly improve the computational speed,save the computational time and improve the computational efficiency while keeping the accuracy.Thus,the DCERSM is verified to be feasible and effective in the dynamic assembly reliability(DAR)analysis of complex machinery.Moreover,this method offers an useful insight for designing and optimizing the dynamic reliability of complex machinery.

Digital Design of Virtual Prototype based on Multidisciplinary Design Optimization

In order to obtain digital design of complex mechanical product as optimal as possible in an efficient way,multi- discipline integrated design method is proposed,which integrates multidisciplinary design optimization (MDO) into digital design process to design virtual prototype (VP) efficiently.Through combining MDO and multi-body system dynamics,MDO integra- tion platform,which takes VP as the core,is constructed.Then automated MDO design of VP is realized and changes of mechani- cal design project can be expressed intuitively during MDO design process.The proposed approach is also demonstrated by using inte- grated analyzing flow of vehicle engineering design.The result shows that the method not only can feasibly realize the MDO of VP, but also can solve the optimization problem of vehicle multi-body system dynamic performance.It can be adopted to the digital de- sign of other complex system.

Multidisciplinary Approach of a Didactic Strategy for the Second Year of High School

During the chemistry week,“A musical,literary,ecological and chemical show”was performed with the participation of students of 552 and 553 groups of the National Preparatory School of National Autonomous University of Mexico.The students had the opportunity to put into action some skills related to reading,research,playing musical instruments and performance.This document relates each activity with the subjects connected in a transversal way(Greco-Latin etymologies,biology IV,health science,universal literature),previous subjects(aesthetic and artistic education,Spanish literature,geography and history),later subjects(history and Iberoamerican and Mexican literature).This show achieved the symbiosis between natural and social sciences and art in an entertaining learning environment.

Constructal optimization of a vertical insulating wall based on a complex objective combining heat flow and strength

For a vertical insulating wall,a product function of heat flow and strength with power weight is introduced as the complex optimization objective to compromise between insulating performance and mechanical performance.Under the global constraints of fixed external dimensions and safety requirements,the constructal optimization of the wall is carried out by taking the complex function maximization as the objective.It is shown that the maximum of the complex-objective function and its corresponding optimal internal structure design under a certain environmental condition can be obtained by allowing the internal structure of the wall to vary(evolve)freely.The validity,effectivity and applicability of the complex function are proved by the results and the power weight parameter in the range from 0.4 to 4 can compromise between the requirements of insulating and strength simultaneously and preferably.The constructal optimization with coequal attention to heat flow and strength and the corresponding results are discussed in detail.The optimal structure design and the corresponding performance analyses under various environmental conditions of application are presented.When the change of environment is greater and the total Rayleigh number is bigger,the insulating wall with large number of cavities should be employed.When the total Rayleigh number is small,the better performance can be obtained by reasonably employing the insulating wall with small number of cavities.The complex function has better selfadaptability,and the results in the recent literature are special cases of this paper.

The effect of preperitoneal pelvic packing for hemodynamically unstable patients with pelvic fractures

Purpose:Hemodynamically unstable patients with pelvic fractures still represent a challenge to trauma surgeons and have a very high mortality.This study was designed to explore the effect of the interventions of direct preperitoneal pelvic packing for the hemodynamically unstable pelvic fractures.Methods:This retrospective study enrolled 67 cases of severe pelvic fractures with unstable hemodynamics from October 2011 to December 2019.All patients presented in our emergency center and received preperitoneal pelvic packing were included in this study.The indication was persistent systolic blood pressure90 mmHg during initial resuscitation and after transfusion of two units of red blood cells.Patients with hemodynamic stability who need no preperitoneal pelvic packing to control bleeding were excluded.Their demographic characteristics,clinical features,laboratory results,therapeutic interventions,adverse events,and prognostic outcomes were collected from digital information system of electronic medical records.Statistics were described as mean±standard deviation or medium and analyzed using pair sample t-test or Mann-Whitney U-test.Results:The patients’average age was 41.6 years,ranging from 10 to 88 years.Among them,45 cases were male(67.2%)and 22 cases were female(32.8%).Significant difference was found regarding the systolic blood pressure(mmHg)in the emergency department(78.4±13.9)and after preperitoneal pelvic packing in the surgery intensive care unit(100.1±17.6)(p<0.05).Simultaneously,the arterial base deficit(mmol/L)were significantly lower in the surgery intensive care unit(median-6,interquartile range-8 to-2)than in the emergency department(median-10,interquartile range-14 to-8)(p<0.05).After preperitoneal pelvic packing,15 patients(22.4%)underwent pelvic angiography for persistent hypotension or suspected ongoing haemorrhage.The overall mortality rate was 29.5%(20 of 67).Conclusions:Preperitoneal pelvic packing,as a useful surgical technique,is less invasive and can be very efficient in early intra-pelvic bleed control.