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Effects of processing parameters on fabrication defects, microstructure and mechanical properties of additive manufactured Mg -Nd -Zn -Zr alloy by selective laser melting process

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JOURNAL Of MAGNESIUM AND ALLOYS 2024年第6期12卷 2249-2266页

作者： Xu, Wenyu fu, Penghuai Wang, Nanqing Yang, Lei Peng, Liming Chen, juan Ding, Wenjiang Shanghai Jiao Tong Univ Natl Engn Res Ctr Light Alloy Net Forming 800 Dongchuan Rd Shanghai 200240 Peoples R China Shanghai Jiao Tong Univ Sch Mat Sci & Engn State Key Lab Met Matrix Composite 800 Dongchuan Rd Shanghai 200240 Peoples R China Shanghai Light Alloy Net forming Natl Engn Res Ctr Shanghai 201615 Peoples R China

Mg-3Nd-0.2Zn-0.4Zr (NZ30K, wt.%) alloy is a new kind of high-performance metallic biomaterial. The combination of the NZ30K Magnesium (Mg) alloy and selective laser melting (SLM) process seems to be an ideal solution to produce porous Mg degradable implants. However, the microstructure evolution and mechanical properties of the SLMed NZ30K Mg alloy were not yet studied systematically. Therefore, the fabrication defects, microstructure, and mechanical properties of the SLMed NZ30K alloy under different processing parameters were investigated. The results show that there are two types of fabrication defects in the SLMed NZ30K alloy, gas pores and unfused defects. With the increase of the laser energy density, the porosity sharply decreases to the minimum first and then slightly increases. The minimum porosity is 0.49 +/- 0.18%. While the microstructure varies from the large grains with lamellar structure inside under low laser energy density, to the large grains with lamellar structure inside & the equiaxed grains & the columnar grains under middle laser energy density, and further to the fine equiaxed grains & the columnar grains under high laser energy density. The lamellar structure in the large grain is a newly observed microstructure for the NZ30K Mg alloy. Higher laser energy density leads to finer grains, which enhance all the yield strength (YS), ultimate tensile strength (UTS) and elongation, and the best comprehensive mechanical properties obtained are YS of 266 +/- 2.1 MPa, UTS of 296 +/- 5.2 MPa, with an elongation of 4.9 +/- 0.68%. The SLMed NZ30K Mg alloy with a bimodal-grained structure consisting of fine equiaxed grains and coarser columnar grains has better elongation and a yield drop phenomenon. (c) 2022 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://***/licenses/by-nc-nd/4.0/ ) Peer review under respons

关键词： Selective laser melting Mg alloy Processing parameter Lamellar structure Bimodal -grained structure. 316L STAINLESS-STEEL IN-VIVO CORROSION MAGNESIUM ALLOYS POROUS METALS ANTIBACTERIAL PROPERTIES ORTHOPEDIC IMPLANTS BIODEGRADATION DEGRADATION SURfACE STENT

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Clinical characteristics of acute non-varicose upper gastrointestinal bleeding and the effect of endoscopic hemostasis

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World Journal of Clinical Cases 2024年第9期12卷 1597-1605页

作者： Xiao-juan Wang Yu-Peng Shi Li Wang Ya-Ni Li Li-juan Xu Yue Zhang Shuang Han Department of Gastroenterology Honghui Hospital Affiliated to Medicine College of Xi’an Jiaotong UniversityXi'an 710054Shaanxi ProvinceChina

BACKGROUND Acute non-variceal upper gastrointestinal bleeding(ANVUGIB)constitutes a prevalent emergency within Gastroenterology,encompassing 80%-90%of all gastrointestinal hemorrhage *** condition is distinguished by its abrupt onset,swift progression,and notably elevated mortality *** To gather clinical data from patients with ANVUGIB at our hospital in order to elucidate the clinical characteristics specific to our institution and analyze the therapeutic effectiveness of endoscopic *** We retrospectively retrieved the records of 532 patients diagnosed with ANVUGIB by endoscopy at our hospital between March 2021 and March 2023,utilizing our medical record *** pertaining to general patient information,etiological factors,disease outcomes,and other relevant variables were meticulously collected and *** Among the 532 patients diagnosed with ANVUGIB,the male-to-female ratio was 2.91:1,with a higher prevalence among ***,43.6%of patients presented with black stool as their primary complaint,while 27.4%had hematemesis as their initial *** admission,17%of patients exhibited both hematemesis and black stool,while most ANVUGIB patients primarily complained of overt gastrointestinal *** routine blood examinations at admission revealed that 75.8%of patients had anemia,with 63.4%experiencing moderate to severe anemia,and 1.5%having extremely severe anemia(hemoglobinf patients experienced bleeding without a definitive trigger,24.2%had a history of using gastric mucosa-irritating medications,24.2%developed bleeding after alcohol consumption,2.8%attributed it to improper diet,1.7%to emotional excitement,and 2.3%to fatigue preceding the bleeding ***-induced ANVUGIB was more prevalent in the elderly than middle-aged and young individuals,while bleeding due to alcohol consumption showed the opposite ***,diet-related bleeding was more common

关键词： Acute non-varicose upper gastrointestinal bleeding Clinical characteristics Cause of disease Endoscopic homeostatic therapy

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Enhancing mechanisms of N-doped biomass carbon on the vanadium-based catalyst for furan degradation at low temperature

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Waste Disposal and Sustainable Energy 2024年第1期6卷 1-9页

作者： Ling Wang Minghui Tang Hongxian Li Jiamin Ding juan Qiu Shengyong Lu State Key Laboratory of Clean Energy Utilization Zhejiang University38#Zheda RoadHangzhou310027China Taizhou Institute of Zhejiang University Taizhou318012China Qingshanhu Energy Research Center Zhejiang University1699 Dayuan RoadQingshanhu Science and Technology CityHangzhou311300China

Polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans(PCDD/fs)have attracted widespread concern due to their high toxicity,and their difficult manipulation in laboratories has made the research process ***,in our work,furan is selected as the model compound owing to the same structure of a central oxygenate *** catalytic oxidation is regarded as an effective and applicable method for the abatement of PCDD/fs,the synthesis of low-temperature catalysts is still a challenging problem in practical *** this situation,we prepared a novel V_(2)O_(5)/TiO_(2)catalyst modified with N-doped hierarchical porous carbon(NHPC)via a wet impregnation *** V/T-1%NHPC catalyst could achieve expectant low-temperature performances with 50%furan conversion at 150℃and a complete conversion at 200℃,which decreased 23℃and 40℃compared to the V/T catalyst ***,the addition of NHPC presented lifting chemical stability during long-time *** addition of NHPC in V/T catalysts decreased the formation of crystalline V_(2)O_(5) and increased the percentages of V^(5+)and O_(lat),which improved the utilization of vanadium ions and the catalytic ***,the higher binding energy shift of O_(lat) implied more reaction possibility with other oxidise ***,this work proved the lifting catalytic activity by the interaction between catalysts and NHPC,and proposed the promoting effects of the N *** results showed that the content of the pyridinic N and graphitic N in NHPC changed after combining with V/T catalyst,which played crucial roles in the excellent catalytic ***,this work provides comprehensive research of the V/T-1%NHPC catalyst toward furan oxidation at low temperature and explain the effects of N-doped biomass carbon in catalytic activity clearly,which gave a new thought to design low-temperature catalysts in PCDD/fs ***,the internal functional mech

关键词： Polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans furan Low-temperature catalyst V_(2)O_(5)/TiO_(2)catalyst N-doped

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Relationship between clinical belonging,professional identity,and nursing information ability among nursing interns:Model construction

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World Journal of Clinical Cases 2024年第13期12卷 2210-2217页

作者： Gai Zhang Shao-juan Huang Shu-fang Li Department of Nursing Foshan Hospital of Traditional Chinese MedicineFoshan 528000Guangdong ProvinceChina

BACKGROUND Clinical belonging refers to the feeling that clinical medical staff feel recognized and accepted by others or *** level of clinical belonging of nursing interns affects students’learning motivation and confidence,which in turn affects their clinical practice *** To explore the effects of professional identity and nursing information ability on clinical belonging among nursing interns and establish a relationship model for these *** The researchers used the convenience sampling method to select 682 nursing interns from *** survey was conducted using a general information questionnaire,clinical sense of belonging scale,nursing information ability self-assessment scale,and a nursing student professional identity *** mediating effect of nursing information ability between their professional identity and clinical sense of belonging was analyzed using SPSS 21.0 and the path analysis in structural equation *** The total scores of clinical belonging,professional identity,and nursing information ability of nursing interns were(104.29±13.11)points,(57.89±7.16)points,and(70.29±6.20)points,*** information ability had a direct effect on the clinical sense of belonging(effect value=0.46,Pffect(effect value=0.52,Pffect(effect value=0.21,Pffective measures to improve the professional identity and nursing information ability of nursing interns,as well as the clinical sense of belonging among nursing interns.

关键词： Belongingness Nursing Education Undergraduate Information literacy Models

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Gender Pay Gap in the Gig Economy

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China finance and Economic Review 2024年第1期13卷 3-22页

作者： Zhiqiang Dong juan Peng Shanshi Liu School of Economics and Management South China Normal University510006

The rapid ascent of digital platforms and the gig economy has prompted concerns about the gender pay *** results show that in the gig economy,gender continues to be a crucial determinant of workers'earnings,with women earning 85%of what men earn on a monthly ***,in comparison to the traditional waged employment during the same period,the gender pay gap in the gig economy has *** some gig jobs(e.g.,ride-hailing services,delivery services,online education)exhibit certain occupational segregation,women in gig economy work are no longer concentrated in low-paying roles,thereby challenging the occupational crowding hypothesis prevalent in traditional *** the gig economy,the vast majority of the gender pay gaps arise from factors within occupations,and occupational segregation only has a very limited impact on the earnings ***,the gender pay gap among platform gig workers can be mostly explained by observable factors,which implies that compared to traditional employment,the gig economy exhibits a lower level of implicit gender discrimination in ***,we investigate new factors that determine the gender pay gap in the gig *** exhibit a stronger aversion to algorithmic control,a preference for job flexibility,and a tendency toward more isolated and less socially interactive work environmentsall of which serve to widen the gender pay gap that might have otherwise *** results of this research suggest that despite the criticisms surrounding the gig economy,it continues to exert a positive influence on China's labor market。

关键词： gig economy platform economy new employment form gender earnings gap gender discrimination

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Impact of Alcian blue and periodic acid Schiff expression on the prognosis of gastric signet ring cell carcinoma

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World Journal of Gastrointestinal Oncology 2024年第3期16卷 687-698页

作者： juan Lin Zhu-feng Chen Guo-Dong Guo Xin Chen Shengli Clinical Medical College Fujian Medical UniversityFuzhou 350001Fujian ProvinceChina Department of Pathology Fujian Provincial HospitalFuzhou 350001Fujian ProvinceChina Department of Internal Medicine Fujian Provincial HospitalFuzhou 350001Fujian ProvinceChina

BACKGROUND The Alcian blue(AB)and periodic acid Schiff(PAS)stains are representative mucus markers in gastric signet ring cell carcinoma(SRCC).They are low-cost special staining methods used to detect acidic mucus and neutral mucus,***,the clinical importance of the special combined AB and PAS stain is *** To investigate AB expression,PAS expression and the AB-to-PAS(A/P)ratio in gastric SRCC patients and to assess patient *** Paraffin-embedded sections from 83 patients with gastric SRCC were stained with AB and PAS,and signet ring cell positivity was assessed ***-histochemical staining for Ki67,protein 53(P53)and human epidermal growth factor receptor 2(HER2)was performed *** cancer-specific survival(CSS)rate was estimated via Kaplan-Meier *** proportional hazards models were used for univariate and multivariate survival *** Kaplan-Meier survival analysis revealed that the 3-year CSS rate was significantly greater in the high-PAS-expression subgroup than in the low-PAS-expression subgroup(Pficantly greater than that in the A/P>0.5 group(P=0.042).Univariate Cox regression analysis revealed that the factors affecting prognosis included tumor diameter,lymph node metastasis,vessel carcinoma embolus,tumor stage,the A/P ratio and the expression of Ki67,P53 and the *** multivariate regression analysis confirmed that low PAS expression[hazard ratio(HR)=3.809,95%confidence interval(CI):1.563-9.283,P=0.003]and large tumor diameter(HR=2.761,95%CI:1.086-7.020,P=0.033)were independent risk factors for poor *** A/P>0.5 is potentially a risk factor for prognosis,and low PAS expression is an independent risk factor in the prognosis of gastric *** expression and the A/P ratio could help in predicting the clinical prognosis of patients with SRCC.

关键词： Alcian blue Periodic acid-Schiff Prognosis Gastric Signet ring cell carcinoma

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A Novel Graph Structure Learning Based Semi-Supervised framework for Anomaly Identification in fluctuating IoT Environment

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Computer Modeling in Engineering & Sciences 2024年第9期140卷 3001-3016页

作者： Weijian Song Xi Li Peng Chen juan Chen Jianhua Ren Yunni Xia School of Computer and Software Engineering Xihua UniversityChengdu610039China West China Second University Hospital Sichuan UniversityChengdu610065China School of Computer Science Chongqing UniversityChongqing400044China

With the rapid development of Internet of Things(IoT)technology,IoT systems have been widely applied in health-care,transportation,home,and other ***,with the continuous expansion of the scale and increasing complexity of IoT systems,the stability and security issues of IoT systems have become increasingly ***,it is crucial to detect anomalies in the collected IoT time series from various ***,deep learning models have been leveraged for IoT anomaly ***,owing to the challenges associated with data labeling,most IoT anomaly detection methods resort to unsupervised learning ***,the absence of accurate abnormal information in unsupervised learning methods limits their *** address these problems,we propose AS-GCN-MTM,an adaptive structural Graph Convolutional Networks(GCN)-based framework using a mean-teacher mechanism(AS-GCN-MTM)for anomaly *** performs better than unsupervised methods using only a small amount of labeled *** Teachers is an effective semi-supervised learning method that utilizes unlabeled data for training to improve the generalization ability and performance of the ***,the dependencies between data are often unknown in time series *** solve this problem,we designed a graph structure adaptive learning layer based on neural networks,which can automatically learn the graph structure from time series *** not only better captures the relationships between nodes but also enhances the model’s performance by augmenting key *** have demonstrated that our method improves the baseline model with the highest f1 value by 10.4%,36.1%,and 5.6%,respectively,on three real datasets with a 10%data labeling rate.

关键词： IoT multivariate time series anomaly detection graph learning semi-supervised mean teachers

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A highoutput PDMS-MXene/gelatin triboelectric nanogenerator with the petal surface-microstructure

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Nano Research 2024年第5期17卷 4151-4162页

作者： Zekun Wang Congcong Hao Mingzhe Cai juan Cui Yongqiu Zheng Chenyang Xue Key Laboratory of Instrumentation Science&Dynamic Measurement Ministry of Education North University of ChinaTaiyuan 030051China State Key Laboratory of Electronic Thin films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 611731China

Triboelectric nanogenerator(TENG)has a promising future in the field of energy harvesting and self-powered sensing due to their simplicity in structure,low cost,and efficient energy harvesting from the surrounding *** output electrical performance of TENG can be improved by doping the friction material with functional materials and modifying the surface of the friction ***,the current method of adding functional materials to friction materials is costly and wasteful,and the method of modifying the surface structure of friction materials is cumbersome and not easy to *** this work,we present a polydimethylsiloxane(PDMS)-MXene/gelatin triboelectric nanogenerator(PMMG-TENG)based on petal surface-microstructures,which has the advantages of low cost,simple preparation,high output performance,and ecological *** doping 0.03 wt.%of MXene in PDMS,the output electrical performance of TENG can be significantly improved,with an output current increase of up to 139.7%.four different petals are used as natural molds to prepare *** results show that PMMG-TENG with peony petal surface microstructure has the best electrical performance,and the output current increase of up to 228.17%compared with PMMG-TENG without *** PMMG-TENG with peony petal surface-microstructure exhibits excellent electrical performance,demonstrating a maximum open-circuit voltage of 417.39 V and a maximum short-circuit current of 12.01μA at a size of 3 cm×3 cm,and a maximum power density of 170μW/cm^(2) at a load resistance of 107Ω.The PMMG-TENG’s output performance after 10,000 cycles is consistent with the initial state,highlighting excellent output *** PMMG-TENG can easily light up at least 100 light emitting diodes(LEDs).(operating voltage 3V.)Gelatin film exhibits excellent degradation performance,with complete degradation time of only 150 s in water at a constant temperature of 75℃.PMMG-TENG not only shows excellent performance in

关键词： triboelectric nanogenerator(TENG) petal surface-microstructure gelatin MXene energy harvesting

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Effect of early stepwise cardiopulmonary rehabilitation on function and quality of life in sepsis patients

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World Journal of Clinical Cases 2024年第4期12卷 729-736页

作者： Ming-Hui Zheng Wen-Jun Liu juan Yang Division of Cardiovascular first Ward Departments of Internal Medicine Liyuan HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430077Hubei ProvinceChina Department of Respiratory Medicine PuRen Hospital Affiliated to Wuhan University of Science and Technology/Respiratory MedicineWuhan 430000Hubei ProvinceChina Department of Cardiology Huanggang Central HospitalHuanggang 438000Hubei ProvinceChina

BACKGROUND Sepsis,as a non-limiting host infection disease,can be accompanied by serious complications such as organ failure,which seriously threatens patient quality of *** To investigate the effect of early stepwise cardiopulmonary rehabilitation on cardiopulmonary function and quality of life in patients evacuated from mechanical ventilation with *** A total of 80 patients with sepsis who were hospitalized in our hospital from January 2021 to January 2022 were selected and divided into the observation group(n=40)and the control group(n=40)according to the random number table *** observation group was treated with early stepwise cardiopulmonary rehabilitation,and the control group was treated with a conventional treatment *** function indexes(central venous pressure,cardiac troponin I,B-type brain natriuretic peptide),lung function indicators(diaphragmatic mobility,changes in central venous oxygen saturation,oxygenation index),and quality of life(Quality of Life Evaluation Scale)were compared between the two groups after *** After treatment,the central venous pressure,diaphragm mobility,central venous oxygen saturation,oxygenation index,and Quality of Life Evaluation Scale scores in the observation group were higher than those in the control group,and the differences were statistically significant(Pf the control group for other parameters,and the differences were statistically significant(Pffectively enhance cardiac and pulmonary function and improve the quality of life in patients evacuated from mechanical ventilation with sepsis.

关键词： Stepwise cardiopulmonary rehabilitation Sepsis Evacuation of mechanical ventilation Cardiopulmonary function Quality of life

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The relationship between morphology and flight in Drosophila:a study of two pairs of sibling species from a natural population

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Insect Science 2024年第3期31卷 885-900页

作者： Nicolás flaibani Victoría Estefania Ortiz juan Joséfanara Valeria Paula Carreira Laboratorio de Evolucion Departamento de EcologiaGenética y Evolucion(DEGE)Facultad de Ciencias Exactas y Naturales(FCEN)Universidad de Buenos Aires(UBA)Instituto de GenéticaEcologia y Evolucion de Buenos Aires(IEGEBA)Consejo Nacional de Investigaciones Cientificasy Tecnicas(CONICET)-UBABuenos AiresArgentina

Insect flight is a complex trait involved in different behaviors,from the search for sexual partners,food,or breeding *** studies have postulated the adaptive advantages of certain morphological traits in relation to increased flight capacity,such as low values of wing loading or high values of wing:thorax ratio and wing-aspect ***,few studies have evaluated the relationship between variables related to flight and morphological traits in *** work aimed to study morphological traits in males and females of two pairs of sibling species:Drosophila buzzati Patterson and Wheeler-Drosophila koeferae fontdevila and Wasserman,and Drosophila melanogaster Meigen-Drosophila simulans Sturtevant,and to analyze its relationship with *** detected the highest proportion of flight time in *** and *** compared to *** and ***,*** results also revealed sexual dimorphism,with males exhibiting a higher proportion of flight time than ***,we did not find a general pattern to explain the relationship between morphology and the proportion of flight time because associations varied depending upon the analyses(considering all groups together or each sex-species combination separately).Moreover,these associations explained a low percentage of variation,suggesting that other nonmorphological components related to flight,such as physiological variables,should be taken into *** work allowed us to show the variability and complexity of an aspect of flight,suggesting that the adaptive role of the morphological traits studied might have been overestimated.

关键词： morphological traits time in flight wing loading wing:thorax ratio wingaspect ratio wing second moment of area

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