Study of energy-efficient heat resistance and cooling technology for high temperature working face with multiple heat sources in deep mine

In the present research,we proposed a scheme to address the issues of severe heat damage,high energy consumption,low cooling system efficiency,and wastage of cold capacity in mines.To elucidate the seasonal variations of environmental temperature through field measurements,we selected a high-temperature working face in a deep mine as our engineering background.To enhance the heat damage control cability of the working face and minimize unnecessary cooling capac-ity loss,we introduced the multi-dimensional heat hazard prevention and control method called"Heat source barrier and cooling equipment".First,we utilize shotcrete and liquid nitrogen injection to eliminate the heat source and implemented pressure equalization ventilation to disrupt the heat transfer path,thereby creating a heat barrier.Second,we establish divi-sional prediction models for airflow temperature based on the variation patterns obtained through numerical simulation.Third,we devise the location and dynamic control strategy for the cooling equipment based on the prediction models.The results of field application show that the heat resistance and cooling linkage method comply with the safety requirement throughout the entire mining cycle while effectively reducing energy consumption.The ambient temperature is maintained below 30℃,resulting in the energy saving of 10%during the high-temperature period and over 50%during the low-temperature period.These findings serve as a valuable reference for managing heat damage in high-temperature working faces.

Vertical direction impaction of kissing molars:A case report

BACKGROUND Kissing molars(KMs)are a scarcely reported form of molar impaction in which the occlusal surfaces contact each other within a single dental follicle and the roots point in opposite directions.The direction of KMs impaction is generally tilted.KMs with vertical direction impaction have not been reported in the literature.CASE SUMMARY A 25-year-old female visited a dentist for right maxillary wisdom teeth extraction and was diagnosed with two vertically impacted KMs in the left mandible on panoramic radiography.After cone-beam computed tomography examination confirmed no secondary complication,the patient chose to undergo observation and regular follow-up.A literature review of KMs revealed that vertical impacted KMs are rare;high-quality evidence regarding their prevalence is still lacking.At present,the causality of KMs is controversial.In this study,we have tried to provide a detailed definition of KMs to allow an accurate evaluation of their prevalence and classification based on their impaction direction which may be related to their pathogenesis.The treatment plan of KMs depends on the condition and location of the affected teeth and associated complications;they may be either directly extracted or treated using a multidisciplinary approach including maxillofacial surgeons and orthodontists.CONCLUSION KMs are a rare clinical condition of impacted teeth with unclear pathogenesis.Vertically impacted KMs were seldom reported.Reasonable definition and classification of KMs can help in the understanding of their causes and prevalence.

脂肽复配型弱碱三元复合驱界面流变性质研究在实验教学中的设计与探索

采用悬滴法通过对界面面积变化及动态界面张力变化的测试,研究脂肽复配型弱碱三元复合驱界面张力以及扩张模量随时间、浓度的变化,并采用SPSS软件对实验数据进行非线性拟合,得到三因素的扩张模量预测模型,分析界面流变性质。该实验操作简单,实验体系设计灵活,同时与油田现场科研项目联系紧密,不仅丰富了物理化学实验有关界面化学实验课程设计,还可以引导学生关注实际生产,激发学生学习兴趣,训练学生软件应用能力及数据分析能力,符合应用型本科培养要求。通过科教融合的培养模式,提升学生处理实际问题的综合能力。

Transition from minimal change disease to focal segmental glomerulosclerosis related to occupational exposure:A case report

BACKGROUND Although minimal change disease(MCD)and focal segmental glomerulosclerosis(FSGS)have been described as two separate forms of nephrotic syndrome(NS),they are not completely independent.We report a case of a patient transitioning from MCD to FSGS,review the literature,and explore the relationship between the two diseases.CASE SUMMARY A 42-year-old male welder,presenting with lower extremity edema and elevated serum creatinine,was diagnosed with NS and end-stage kidney disease(ESKD)based on laboratory test results.The patient had undergone a kidney biopsy for NS 20 years previously,which indicated MCD,and a second recent kidney biopsy suggested FSGS.The patient was an electric welder with excessive levels of cadmium and lead in his blood.Consequently,we suspect that his aggravated pathology and occurrence of ESKD were related to metal nephrotoxicity.The patient eventually received kidney replacement therapy and quit his job which involved long-term exposure to metals.During the 1-year follow-up period,the patient was negative for metal elements in the blood and urine and recovered partial kidney function.CONCLUSION MCD and FSGS may be different stages of the same disease.The transition from MCD to FSGS in this case indicates disease progression,which may be related to excessive metal contaminants caused by the patient’s occupation.

Formation of infinite 2D water layers in a crystal host

A self-assembled, （H20）38 cluster stabilized by a mono-nuclear copper（H） complex 1 namely { [Cu（phen）2（CO3）].7H2O} is characterized by X-ray diffraction studies. The adjacent （H2O）38 clusters connect together resulting in an infinite 2D water layer structure. The water morphology is stable at room temperature, but upon thermal decomposition, the water loss is irreversible. C 2009 Cai Hua Zhou. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

Study on Seismic Fragility Analysis for Piping of CEFR

This paper introduces the conception of seismic fragility, gives the model of seismic fragility analysis, and places emphasis on discussing quantization process of seismic fragility parameters. Then, establishes 3D model of pipes of Chinese Experimental Fast Reactor (CEFR) accident residual heat removal system, and obtains the stresses which are essential for calculating seismic fragility parameters. Finally, combined with quantitative methods of seismic fragility, calculates the safety factors and uncertainties of CEFR pipeline, and obtains the system seismic fragility parameters: Am = 2.42 g, βr = 0.36, βu = 0.44, HCLPF = 0.65 g. The results show that: the pipeline of CEFR accident residual heat removal system has high seismic capacity.

Research and Analysis on Cognitive Radio Network Security

This paper firstly gives a detail analysis on the security problems faced in cognitive radio network, and introduces the basic issues about cognitive radio network. Then, according to the differences between cognitive radio network and existing wireless network, it analyses and discusses the dynamic spectrum access security and artificial intelligence. Finally, it draws a conclusion to security problems of cross layer design.

Aesthetic style transferring method based on deep neural network between Chinese landscape painting and classical private garden's virtual scenario

Most of the existing virtual scenarios built for the digital protection of Chinese classical private gardens are too modern in expression style to show the aesthetic significance of their historical period.Considering the aesthetic commonality between traditional Chinese landscape paintings and classical private gardens and referring to image style transfer,here,a deep neural network was proposed to transfer the aesthetic style from landscape paintings to the virtual scenario of classical private gardens.The network consisted of two parts:style prediction and style transfer.The style prediction network was used to obtain style representation from style paintings,and the style transfer network was used to transfer style representation to the content scenario.The pre-trained network was then embedded into the scenario rendering pipeline and combined with the screen post-processing method to realise the stylised expression of the virtual scenario.To verify the feasibility of this methodology,a virtual scenario of the Humble Administrator’s Garden was used as the content scenario andfive garden landscape paintings from different time periods and painting styles were selected for the case study.The results demonstrated that this methodology could effectively achieve the aesthetic style transfer of a virtual scenario.

Rwdd1,a Thymus Aging Related Molecule,Is a New Member of the Intrinsically Unstructured Protein Family

We had previously identified a novel protein termed Rwddl whose expression in thymus is decreased in aged or oxidatively stressed mice. In the present study, we found that Rwddl expressed in both prokaryotic and eukaryotic ceils showed a slower migration rate on SDS-PAGE gel. In addition, Rwddl was more sensitive to proteinase proteolysis. Furthermore, being a highly acidic protein which contains an RWD domain, Rwddl shared a high level of sequence similarity with Gir2, a member of the intrinsically unstructured protein （IUP）. These findings suggest that Rwddl is a novel member of the IUP family.

Recent advances in directα-C(sp^(3))-H bond functionalization of thioethers

Thioether skeletons are widely present in drugs,natural products,functional materials,and life science.In the past decade,the selective C–H functionalization of thioethers has been extensively studied to construct novel thioether derivatives.This mini-review systematically introduces the recent advances in the field of the directα-C(sp^(3))-H functionalization of thioethers.