Digital talent provides a unique perspective to study the global digital transformation and gain insights into the global digital economy. Trends like talent migration, hiring rates, and in-demand skills by region are focuses for LinkedIn and we are partnering with governments and non-governmental organizations around the world to share these insights and recommend policy solutions. In examining regional migration, we have found that China faces several challenges - an imbalance in the distribution of digital talent, lack of focus in digital talent cultivation and gender gaps in digital talent when hiring.
Acoustic neuroma has similarities with other intracranial tumors in imaging manifestations and location of incidence, and misdiagnosis often occurs in clinical practice. This paper uses a mask region convolution neural network (Mask RCNN) to classify acoustic neuromas. The T1WI-SE sequence MRI images of 120 patients with acoustic neuroma in our hospital were collected. Based on preprocessing, the improved feature pyramid networks (FPN) algorithm and Mask RCNN comprehensive training were conducted, and the classification effects of different networks were compared. The accuracy of the Mask RCNN classification model of ResNet101 network was 0.92, the recall rate was 0.86, the specificity was 0.89, and the mean average precision (mAP) was 0.91. The classification model based on Mask RCNN algorithm has a good effect on the differentiation and classification of acoustic neuroma.
The bumper development of digital technology has impacted intensively on the traditional production process of movie film.Nowadays advanced digital technology provides a sound basis for the realization of the digitization of movie production.This paper expounds the concept of digital intermediate(DI),its production process flow and relevant technical devices.In the light of a comparison with the technical data of HD technology,the paper elucidates also the exceptional superiorities of digital technology in the video and audio areas.
Submesoscale motions are ubiquitous in the ocean, playing a significant role in energy transfer, mass transport, and biogeochemical processes. However, little attention has been drawn to the submesoscale dynamics in shallow coastal waters. In the present study, submesoscale motions in the Bohai Sea, a typical shallow sea with mean depth of about 18 m, are studied using a validated high-resolution (~ 500 m) model based on Regional Oceanic Modeling System (ROMS). The results show that submesoscale structures in the Bohai Sea are mainly located in the shallow coastal regions, the Bohai Strait, the areas around islands and headlands, and mostly tend to be parallel to the isobaths. The periodic variations of submesoscale motions are closely related to the tidal, spring-neap, and seasonal cycles in the Bohai Sea. The spring-neap variations of submesoscale motions are mainly attributed to the curl of vertical mixing, which is stronger during spring tides than neap tides. Compared with winter, the stronger background horizontal and vertical density variance in summer are conducive to frontogenesis, resulting in more active submesoscale motions. The results in this study are expected to contribute to enriching our knowledge about submesoscale dynamics in shallow coastal seas.
Abstract The ADvanced CIRCulation (ADCIRC) model was applied to the sea area surrounding Qingdao, China, to estimate the impact of climate change on storm surge and inundation induced by eight typical typhoons in current and future scenarios. Model results were validated using the available observations. These results indicate that the storm surge caused by typhoons with different intensities and paths has various effects on the Qingdao area. Furthermore, measurement results of the storm inundation area in the future scenario revealed that, in any case, with the future rise in sea level, the typhoon intensity, the inundation area, and the storm surge intensity increase. In response to changes in the storm surge and the actual situation in Qingdao, this study emphasized that coastal flooding is caused by the storm surge. Three adaptation measure scenarios were set as follows: the current level of adaptation measures (CLA), the continuation level of adaptation measures (CA), and the enhanced level of adaptation measures (EA). Based on different scenarios, the CA will reduce most of the inundation area caused by coastal flooding compared with the CLA. EA is the most significant in reducing inundation, demonstrating a decrease in inundation of more than 50%. This research has shown that good coastal protection will reduce most coastal flooding, and building dams will be considered a significant adaptation measure.
水温对沉水植被的生长和分布具有重要作用,水-沉积物界面热通量对浅水湖泊水温变化的影响值得关注.东太湖是我国东部典型的草型浅水湖区,采用自2013年11月至2015年10月对东太湖湖心进行的不同深度水体及沉积物温度高频观测数据,结合东太湖表层沉积物的热力学性质计算了水-沉积物界面热通量,分析了东太湖水温和水-沉积物界面热通量的变化特征并探讨了其影响因素.结果表明:东太湖各深度水体日升温过程随水深增加后延,升温过程夏季延长,冬季缩短;表层水温日变幅最大,底层水温日变幅次之,沉积物温度日变幅最小,各深度温度日变幅夏季最小、冬季最大;春季和夏季升温过程中各深度日均温变化沿水深存在约1天的延迟,秋季和冬季无此现象;2015年与2014年东太湖温度变化趋势相同,同比月均温差与气温差呈线性相关.沉积物8:00-19:00向水体放热增加或从水体吸热减少,19:00至次日8:00放热减少或吸热增加;3-9月从水体吸热,为热汇,10月至次年2月向水体放热,为热源,沉积物全年为湖泊热源;逐日水-沉积物界面热通量每月6至15日存在相对年变幅较小幅度的正弦式波动.水温和水-沉积物界面热通量的变化主要受太阳辐射和气温的影响,二者对气象参数的响应具有迟滞现象;水-沉积物界面热通量与水温呈负相关,其变化相对水温迟滞,水-沉积物界面热交换的主要作用为缓冲湖泊水体的热量变化;夏季,沉水植物能降低湖泊各层水温和垂向水温差.;Water temperature is critical for growth and distribution of submerged macrophyte and heat flux at water-sediment interface (WSI) is essential for water temperature changes. East Lake Taihu is a typical shallow macrophyte-dominated lake in eastern China. Temperatures of water and sediment at different depths were monitored with high frequency from November 2013 to October 2015 in the middle of East Lake Taihu. Heat flux at WSI was calculated with inferred thermodynamic parameters. Changing patterns of water temperature and heat flux at WSI were revealed and their influencing factors were discussed. Results showed that the temperature rising processes were delayed with the increase of water depth. Water temperature rising process was prolonged in summer and shortened in winter. Temperature ranges in averaged 24 hours:surface water temperature > bottom water temperature > temperature at WSI > sediment temperature. Temperature ranges in averaged 24 hours were smallest in summer and largest in winter. There was a 1-days' hysteresis of temperature changes along the water depth when the temperature rose in spring and summer, while not in autumn and winter. Annual trends of temperatures in 2015 was same with 2014, and differences of year-on-year monthly averaged temperatures were significantly correlated with differences of air temperatures. Heat absorption of sediment from water increased or its heat emission to water decreased from 8:00 to 19:00, while 19:00 to 8:00 next day in verse. From March to September, heat transferred from water to sediment, while from sediment to water from October to February next year. Sediment was heat source of East Lake Taihu in a whole year. Heat flux at WSI also had smaller 6-15 days' periodic fluctuations. Although changes of water temperature and heat flux at WSI were mainly affected by solar radiation and air temperature, they had delayed response towards meteorological parameters. Heat flux at WSI was negatively correlated with water temperature, and its change lagged behind water temperature change. The main function of heat flux at WSI was to buffer heat changes of lake. Submerged plants can relief surface water temperatures of lake as well as the vertical temperature gradients in summer.
The risk of marine disasters based on flooding is one of the most significant natural disasters in coastal zones. It can be said that flooding in coastal zones has typical sea–land characteristics. Yet, relatively little research has been done in this area. Thus, by using the characteristics of marine disaster risk based on flooding in Qingdao and combining marine science and land science methods, this paper constructs a targeted indicator system for the flooding risk from marine disasters from the perspectives of the disaster natural chain and flooding process. According to the results, the Integrated Risk Index of marine disasters based on flooding in Qingdao is 0.3694, which represents a medium risk level for natural disasters in China’s major coastal areas. The first- and third-level indicators with large contribution rates are almost all natural indicators. This indicates that the natural disaster process and disaster chain greatly affect the flooding disaster risk in Qingdao. However, although natural factors play large roles in the risk of disaster, preventive methods implemented by humans can still have a positive effect on disaster reduction. Therefore, human society should still proceed with understanding disasters from natural processes, change their passive response to active adaptation, and actively strengthen preventive measures to alleviate the adverse impacts of increasingly serious natural disasters.
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