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Prediction and Control of Distortion and Residual Stresses in Electron Beam Welding

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稀有金属材料与工程 2011年第S4期40卷 26-29页

作者： Nick Bagshawa chris Punshona TWI Ltd Granta ParkGreat AbingtonCambridgeCB21 6ALUK

Electron beam welding is recognized as an attractive method for minimizing distortion during welding,and is used frequently to join parts which are already finally machined or close to finished *** such cases,before EB welding,it is of great value to be able to estimate the level of accuracy that will be achieved and the dimensional stability of the assembly throughout its service *** presentation describes the development of a finite element (FE) modelling technique,validated by experiment,for predicting and understanding the development of residual stresses and distortion during EB welding,particularly in circular *** use of this method for optimization of welding procedures and residual stress mitigation methods is described and illustrated through a number of practical examples.

关键词： EB welding residual stress distortion

Development and Pull-through of Climate Science to Services in China

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Advances in Atmospheric Sciences 2018年第8期35卷 9-12页

作者： chris HEWITT Nicola GOLDING Met Office FitzRoy Road Exeter EX1 3PB UK

1. IntroductionThe impacts arising from climate change and climate variability pose major challenges to global and regional security and economic prosperity（UNFCCC,2015）.Some regions are more at risk than others, through heightened exposure to climatic hazards, and high vulnerability and exposure to such hazards. China, with its rapid economic development, large and growing population, and frequent occurrence of disasters associated with heavy rainfall, flooding, tropical cyclones,

关键词： In Development and Pull-through of Climate Science to Services in China

A two-stage process with temperature-shift for enhanced anthocyanin production in strawberry cell suspension cultures

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Science China Chemistry 1999年第4期42卷 345-350页

作者：张卫 Shintaro Furusaki chris Franco Department of Chemistry and Biotechnology Graduate School of Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113 Japan Biotechnology School of Medicine Flinders University of South Australia Bedford Park SA 5042 Australia

A two-stage process with temperature-shift has been developed to enhance the anthocyanin yield in suspension cultures of strawbeny cells. The effect of the temperature-shift interval and the shift-time point was investigated for the optimization of this strategy. In this process, strawbeny cells were grown at 30°C (the optimum temperature for cell gowth) for a certain period as the first stage, with the temperature shifted to a lower temperature for the second stage. In response to the temperature shift-down, anthocyanin synthesis was stimulated and a higher content could be achieved than that at both boundary temperatures but cell growth was suppressed. When the lower boundary temperature. was decreased, cell growth was lowered and a delayed, sustained maximum anthocyanin content was achieved. Anthocyanin synthesis was strongly influenced by the shift-time point but cell growth was not. Consequently, the maximum anthocyanin content of 2.7 mg.g-fresh cell-1 was obtained on day 9 by a temperature-shift from 309°C, after 3-d culture, to 15°C. The highest anthocyanin yield of 318 mg. L-1 on day 12 was achieved when the temperature was shifted from 30°C, after 5-d culture, to 20°C. For a global optimization of both the yield and productivity, the optimum anthocyanin yield and productivity of 272 mg.L-1 1 and 30.2 mg.L-1d1 on day 9 were achieved by a two-stage culture with a temperature-shift from 30°C after 3 d to 20°C.

关键词： strawberry cell suspension cultures anthocyanin temperature two-stage culture temperature-shift.

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艺术中的秩序与变化互动装置RHUBARB

室内设计与装修 2024年第10期 144-145页

作者：无 chris Jary(摄影) Diego Albo Martinez(摄影) Alexandre Carpentier(摄影) Atelier DARN(摄影) 西竹(译) Atelier DARN 不详

2024年活跃建筑节(Festivaldes Architectures Vives)公布了其公众奖得主--由Atelier DARN设计的互动装置RHU/BARB。该装置将建筑、体育、艺术、文学与环保意识等元素交织在一起,搭建在法国蒙彼利埃的18世纪历史古迹奥雷斯酒店(Hotel d... 详细信息

2024年活跃建筑节(Festivaldes Architectures Vives)公布了其公众奖得主--由Atelier DARN设计的互动装置RHU/BARB。该装置将建筑、体育、艺术、文学与环保意识等元素交织在一起,搭建在法国蒙彼利埃的18世纪历史古迹奥雷斯酒店(Hotel d’Aures)的庭院中。

关键词：蒙彼利埃历史古迹互动装置环保意识 RH

Brain-Computer Interface Speaks Up

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Engineering 2022年第2期8卷 3-5页

作者： chris Palmer Senior Technology Writer

As reported in July 2021 in The New England Journal of Medicine,a neural implant helped a paralyzed man speak his first compre-hensible words in 18 years:“My family is outside”[1,2].The achievement—albeit in a single patient,nicknamed Pancho,who as a 20-year-old in 2003 suffered a severe stroke following a hor-rific car crash—highlights recent progress in engineering brain–computer interfaces(BCIs).The algorithms that control the array of electrodes placed onto the speech areas of Pancho’s brain and translate his neural activity into words were developed by researchers at the University of California,San Francisco(UCSF).The team hopes their work could one day restore the ability to communicate to the thousands of people each year that lose the capacity to speak due to stroke,disease,or injury.

关键词： speak neural translate

Morbidity and Mortality during Anaesthesia in Patients with versus without Diabetes: Single-Centre Cohort Study

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Open Journal of Anesthesiology 2024年第3期14卷 93-107页

作者： Noelly Mukuna Wilfrid Mbombo Joseph Nsiala Aliocha Nkodila Alphonse Mosolo Freddy Mbuyi Jonathan Kukila Paul Kambala Rémy Kashala chris Nsitwavibidila Patrick Kobo Dan Kankonde Gracias Likinda Jean Claude Mubenga Khazi Anga Lionel Diyamona Berthe Barhayiga Department of Anaesthesia and Intensive Care Kinshasa University Clinics University of Kinshasa Kinshasa DRC Department of Anaesthesia and Intensive Care Monkole Hospital Kinshasa DRC Protestant University of Congo Kinshasa DRC Laboratory Department Monkole Hospital Kinshasa DRC Department of Clinical Biology Kinshasa University Clinics University of Kinshasa Kinshasa DRC Surgical Department Monkole Hospital Kinshasa DRC Department of Internal Medicine Monkole Hospital Kinshasa DRC

Background and objective: Classically, diabetic subjects are at high risk of anaesthesia compared with general population. However, some recent publications have shown contrasting and sometimes contrary results. The aim of our study was to evaluate morbidity and mortality during and after anaesthesia in patients with versus without diabetes operated on at Monkole Hospital over the last ten years. Methods: Retrospective cohort study including all patients who underwent all-comers surgery excluding cardiac surgery between 2011 and 2021. Each diabetic patient was matched to 2 non-diabetic controls on age and sex. The evaluation criterion was the frequency of occurrence of at least one perioperative complication and/or death up to day 30. A multivariate analysis using a Cox model was used to determine the factors associated with the occurrence of this morbidity and mortality. The model was adjusted for comorbidities, preoperative hyperglycaemia, ASA score, type of anaesthesia and severity of surgery. Results: A total of 351 diabetic patients (mean age 53.3 ± 14.18 years) and 701 non-diabetic patients (mean age 53.52 ± 14.7 years) were included and analysed. Preoperatively, hyperglycaemia (blood glucose > 180 mg/dl) was observed in 24.3% of diabetic patients compared with 1.6% of non-diabetic patients. The incidence of overall perioperative complications was 25.6% in diabetic patients compared with 28.6% in non-diabetic patients (p = 0.27). The risk factors associated with this morbidity were general anaesthesia with oro-tracheal intubation vs loco-regional anaesthesia (OR = 3.06 [95%CI: 1.91 - 4.94];p Conclusion: This study shows that there is not significant increase in perioperative morbidity and mortality in diabetic patients compared with non-diabetic ones of similar severity. These results suggest that diabetes itself (excluding associated comorbidities) has only a minor impact on perioperative morbidity and mortality.

关键词： Anaesthesia Diabetes Morbidity Mortality Perioperative

The Hidden Side of the Story between the Placenta and Preeclampsia: Preliminary Results of a Prospective Cohort of Pregnant Women in Cameroon

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Open Journal of Obstetrics and Gynecology 2024年第4期14卷 610-620页

作者： Junie Annick Metogo Ntsama Ambroise Merci Engounou Seme Urielle Julie Tchuente Sutchueng Wilfried Loic Tatsipie christian Vagoda Henry-Leonard Chatelin Mol Madye Ngo Dingom Felix Essiben Cyrille Claude Noa Ndoua Yann chris Eng Odile Fernande Zeh Faculty of Medicine and Biomedical Sciences University of Yaound&#233 I Yaound&#233 Cameroon Faculty of Medicine and Pharmaceutical Sciences University of Dschang Dschang Cameroon

Introduction: Pre-eclampsia is a complication of pregnancy that generally occurs in the third trimester. It is associated with a maternal and foetal mortality rate of around 27%. In view of the grim picture painted by this condition for both mother and newborn, studies have been carried out into the early detection of patients at risk of developing pre-eclampsia. These make it possible to introduce pregnancy-specific monitoring and preventive strategies to reduce the incidence of the condition. Objective: To establish the link between placental ultrasound characteristics and the onset of pre-eclampsia. Methodology: A multicentre prospective cohort study was conducted in two hospitals in Yaoundé, namely the Yaoundé Gynaecological Obstetrics and Paediatrics Hospital and the Nkolndongo Health and Social Animation Centre, in the gynaecology and radiology departments over a period of 11 months, from October 2022 to August 2023. It included pregnant women who had undergone obstetric ultrasound between 12 and 18 weeks’ gestation. In addition to routine obstetric ultrasound, we performed obstetric Doppler measurements in these patients. The resistance index of the left and right uterine arteries, the umbilical artery and the placental volume were the characteristics sought. At the end of this examination, two groups were formed: cases (pathological Doppler group) and controls (normal Doppler group). Blood pressure and urine dipstick were taken at each antenatal visit until delivery, then during the immediate postpartum period and finally at 7 days, 21 days and 42 days after delivery. Results: Sixty-seven (67) patients were included. Of these, 35 (47.8%) had pathological Dopplers. Sixteen patients had arterial hypertension associated with proteinuria and were therefore labelled as pre-eclampsia (PE). This gives a prevalence of 23.9%. Fifteen (42.8%) of these patients belonged to the exposed group and one to the unexposed group. The mean IR of the pre-eclampsia patients was s

关键词： Pre-Eclampsia Doppler Ultrasound Placenta

The Boeing 737 Max Saga: Automating Failure

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Engineering 2020年第1期6卷 2-3页

作者： chris Palmer 不详

When Boeing announced the 737 Max in 2011, the plane was hailed as the next generation of the manufacturer’s dependable workhorse airliner. The Max, which first entered service in 2017 with new, more fuel-efficient e... 详细信息

关键词： Max horse service

Electric Car Market Poised to Accelerate

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Engineering 2021年第2期7卷 136-138页

作者： chris Palmer 机构不详

In October 2020,China announced plans to stop manufacturing and selling non-hybrid gas-powered vehicles by 2035[1].Proposed bans on sales of all new gas-powered cars were also recently announced by California in the United States(by 2035)[2],India(by 2030)[3],and many countries in the European Union(various dates)[3].Enacted to curb climate change,such restrictions seem likely to boost the prospects for electric vehicles(EVs),which are increasingly seen as the most viable alternative to gas-powered vehicles.

关键词： Market likely powered