Analysis of a Rare Large-scale Hail Process in Yantai and Weihai

A rare large-scale hail process in Yantai and Weihai City in the autumn of 2021 was analyzed based on the surface meteorology,high-altitude observation and S-band radar detection data.The results showed that this process was influenced by shallow trough,and strong upper-level jet stream in the middle and upper levels guided the intrusion of mid-level cold air into the warm and humid environment at the lower level.The shear lines and trunk lines in the lower level also provided certain triggering conditions for uplift,brewing conditions suitable for the occurrence and development of strong convection.The vertical wind shear was unusually large,and vertical wind shear was up to 10 m/s at 0-1 km,20 m/s at 0-3 km,and 32 m/s at 0-6 km,which was conducive to the growth of the storm.In this process,isolated multi-cell thunderstorm was generated at the beginning,and then it developed and strengthened continuously,moving to the southeast.In the later stage,a convection cell was born at the boundary between Yantai and Weihai,and developed into supercell storm.The storm lasted for a long time,and continued to develop and strengthen as it moved eastward,affecting most areas of Weihai from northwest to southeast.In the development stage of the storm,the radar reflectivity factor had obvious characteristics of hook echo and three-body scatter spike,and there was echo overhang and other hail echo features in the middle layer.Weak mesocyclone appeared at a low elevation,and there was the potential for the occurrence of tornado.

国际社交媒体中烟台城市形象传播效果研究——以推特账号@DiscoverYantai为例

城市形象是城市软实力的重要组成部分,提升城市传播影响力对于塑造城市形象具有重要意义。本研究以烟台人民政府2021年创立的推特账号@DiscoverYantai为研究对象,通过自然语言处理、LDA主题模型和数据分析等方法,研究了该账号的推文文本数据,分析该账号的传播内容和传播效果。研究结果显示,烟台在城市形象传播方面存在潜力未充分发挥、形象塑造不够丰满等问题。基于此,本研究提出了利用国际社交媒体提升烟台城市传播影响力的建议。

Driving Mechanism of Cultivated Land Transition in Yantai Proper,Shandong Province,China

Cultivated land transition and its driving mechanism are the hotspots among studies on land use change. In this study, we constructed a framework to study the driving mechanism of cultivated land transition from the quantitative perspective. Based on the vector data of land use in 1990, 2000 and 2009 of Yantai Proper, Shandong Province China, 11 explanatory variables were chosen from two aspects: the elevation, slope, cost distance to major water area and cost distance to minor water area, which presented physical factors; cost distance to district center, cost distance to town center, cost distance to city expansion center, cost distance to major roads, cost distance to city roads, cost distance to county roads and cost distance to rural roads, which presented the socio-economic factors. Combined with spatial analysis tools and Logistic regression analysis model, we construct Logistic regression analyses with four objectives that were urban construction land, rural residential land, orchard and other lands. The results show that, cost distance to district center, cost distance to town center, cost distance to city expansion center and cost distance to city roads are the significant explanatory variables for the transition of cultivated land into urban construction land. The main explained factors on the transition of cultivated land into rural residential land are slope, cost distance to town center, cost distance to county roads and cost distance to rural roads. Slope, cost distance to minor water area, cost distance to town center, cost distance to county roads and cost distance to rural roads are the significant explanatory variables for the transition of cultivated land into orchard land. Elevation, slope, cost distance to major water area and cost distance to minor water area are the main explanatory variables on the transition of cultivated land into other land uses.

Temporal and spatial variations in the distribution of macroalgal communities along the Yantai coast, China

To explore the impact of environmental variables on macroalgal communities, their temporal and spatial distributions were examined along the Yantai coast, China between April 2010 and March 2011. Macroalgae sampling was conducted monthly at four sites along the coast: Jiahe River estuary, Zhifu Island, Fisherman's Wharf, and Yangma Island. The species composition and abundance, and their relationship with environmental variables were assessed. Along the Yantai coast, 35 macroalgae species were identifi ed, including 24 Rhodophyta spp., 7 Chlorophyta, and 4 Phaeophyta spp. Highest species numbers were recorded in the summer at all sampling sites, except in the Jiahe River estuary. Macroalgae biomass was the greatest in the summer. Year-round, the highest species number and dry biomass recorded at Fisherman's Wharf and Yangma Island was attributed to the substrate type. In summer, Ulva pertusa Kjellman was the dominant species identifi ed along the Yantai coast, which indicates a risk of macroalgae blooms. Our results show that seawater temperature and nutrients appear to signifi cantly affect the temporal and spatial patterns of macroalgal abundance along the Yantai coast. The effects of environmental variables on the macroalgae on the Yantai coast need further study.

Study on Lightning Protection Integrated Service Management Platform in Yantai City

Via database technology, a perfect lightning protection integrated service work platform is established, thereby realizing paperless data management of routine business.

A new species of interstitial polychaete Hesionura shandongensis sp. n. (Polychaeta, Phyllodocidae) from Yantai, the Huanghai Sea

In a study of meiofauna polychaete from the Huanghai Sea, a previously undescribed species belonging to Hesionura has been found and described. The new species differs from the other species of the genus Hesinura mainly by the chaetation.

DISSOLVED AND PARTICULATE ORGANIC CARBON IN YANTAI SISHILI BAY AQUICULTURE WATERS

Investigation of dissolved organic carbon (DOC) and particulate organic carbon (POC) at 12 stations in Yantai Sishili Bay in May, August, and November of 1997 and March and May of 1998 showed that DOC concentrations varied from 1.14 mg/L to 5.35 mg/L; that the average values at all stations in each cruise varied from 1.52 mg/L to 2.12 mg/L; that POC concentrations varied from 0.049 mg/L to 1.411 mg/L; and averaged 0.159 mg/L to 0.631 mg/L in each cruise. Horizontal distribution of DOC was influenced by factors such as continental input, organism activity, temperature, aquiculture environment, etc. The higher POC concentration occurred along the coast. The vertical distribution of DOC and POC changed obviously in spring and summer, but not obviously in autumn and winter. DOC concentration was highest in summer and POC in spring; both were lowest in winter. The seasonal change of DOC was consistent with primary productivity seasonal variation, and that of POC was consistent with chlorophyll a seasonal variation. The seasonal change trend of the C/N ratio of dissolved organic matter was obvious, but the C/N ratio of particulate organic matter had no such trend.

An ecological study on the fouling organisms in Yantai Harbour

Yantai Harbour (37°33′15″N , 121°23′42″E) is situated at the north coast of Shandong Peninsula and is a large fishing and commercial port of North China. From June 1983 to May 1984, a yearly panel test on fouling organisms was carried out at the non-fixed jetties in the inner and outer harbour. The test method was according to "the Marine Survey

Experimental Phonetics Contrastive Study on [d?][t?][?]——Spoken by American Native Speakers and Yantai English Learners

The negative transfer of native language influences the English acquisition process of the college students from Yantai in a great degree,both in the segmental and suprasegmental level,while the consonants in the segmental level are influenced most.The paper makes an experimental phonetic contrastive study on [d?],[t?],[?] in the aspect of frication between native English speakers from America and English learners from Yantai basing on processing a large number of English word corpora by using PRAAT.It is found that the degree of frication of [d?],[t?],[?] in American English is strong,while Yantai weak.

Analysis on Causes for Yearly Increment of Content of the Inorganic Phosphorus in the Nearshore Sea Area of Yantai

Detailed analyses of the monitored data provided by the Yantai Ocean Administration Office between 1989 and 1996 show that, the fluctuation regularities of content of the inorganic phosphorus are as follows: the content of inorganic phosphorus fluctuated near the class-1 standard line basically from 1989 to 1993, tended to increase rapidly from 1993, and increased continuously, causing water quality to be deteriorated from the class-2 to class-3 standard by 19%. Causes for increment of the content of inorganic phosphorus are also analyzed. The results show that, the flux of phosphorus entering Yantai nearshore sea area increases at an annual rate of 16.5 percent, in which the increment rates of the phosphorus contained in washing powder and in phosphate fertilizer are 12.9 and 17.5 percent respectively. Both of them kept a positive interrelationship with their fluxes into the sea. In addition, the migration and regeneration mechanism of the phosphorus within the nearshore area also lead to the

STUDY ON SPATIAL LANDSCAPE PATTERN OF YANTAI CITY BASED ON RS AND GIS

Influenced by artificial factors, landscape pattern of Yantai City, Shandong Province changes continuously. Revealing its landscape pattern and its changing process has a practical significance for the urban development and layout. Zhifu District, Development Zone, Laishan District and Fushan District in Yantai City were selected to study the landscape pattern. Remote sensing technology was used to obtain landscape information of different periods. Under the support of Geographic Information System (GIS), the spatial landscape pattern of Yantai City was analyzed and simulated by using various special quantitative analysis models. The analysis shows that built-up area lies in the center of Yantai City, the outside is vegetable land, irrigated land, dry land, garden land and woodland.

Current Lightning Risk Assessment in Yantai

The development situation and business processes of lightning risk assessment in Yantai were summarized and analyzed to provide references for the operation of lighting risk assessment. This study aimed to further improve lightning risk assessment and promote the development of lightning risk assessment through practice and discussion.

The Checklist of Coastal Invertebrates in Yantai City of China

122 coastal invertebrates were recorded in Yantai of China ,which belong to 9 phyla ,22 classes ,34 orders ,74 families.

Statistical Assessment System of Thunder and Lightning Disaster in Yantai City

Starting from lightning disaster information and using computer technology, lightning disaster information is arranged and classified, thereby realizing automatic management of lightning disaster information.

Analysis of the Comparison of Twice Regional Large Rainstorms in Northwest Yantai City

[Objective] The twice regional rainstorms in northwest Yantai in July in 2009 and July in 2010 were expounded.[Method] The twice regional rainstorm in northwest Yantai in July in 2009 and July in 2010 were selected for comparison analysis by dint of conventional and non-conventional weather data,from the aspects of circulation background,physics quantity,and radar echo,etc.[Result] The twice large rainstorm process were regional convective strong precipitation.The rainstorm fell in the northwest of Yantai and had a strong precipitation center above 200 mm.The twice large rainstorm was affected by subtropical and shear line.The rainstorm area was related to the location of 588 dagpm line,westerly trough,and shear line.It was regional rainstorm of typical subtropical edge warm and wet airstream,combination of low vortex and shear line of westerly.The precipitation occurred around the center of water vapor flux;K index had pretty good indication effects to the generation of rainstorm.Large rainstorm occurred around the place with high K index.The K index of twice large rainstorm was larger than or equal to 34 ℃,and was close to the rainstorm falling area where K index was larger than or equal to 35 ℃.The reflection factor of twice large rainstorms at 0.5° elevation,the largest echo intensity was from 55 to 60 dBz,in strip echo from south to north,through the west peninsula,forming train effect.The data report product also had important reference basis for the report of regional large rainstorm.[Conclusion] The study provided references and basis for the report of large rainstorm in the future.

Urban Space Reshaping Based on Regional Urban Design:A Case Study of Urban Design of Taiping Bay Wharf Area in Yantai City

In the process of rapid development of urbanization and constant adjustment of urban space,urban characteristics are faced with many challenges.Taking Taiping Bay wharf area of Yantai City as an example,the paper sorts out the spatial construction problems from the aspects of historical development,urban texture and cultural characteristics by exploring the research process and methods of regional urban design,and put forward optimization strategies from the perspectives of urban structure optimization,street image design,industrial building transformation and cultural space establishment based on the characteristic resources of the area,thus providing experiences for future regional urban design.

Optimization and Upgrading of Marine Tourism Products in Yantai Based on Resource Value Evaluation

The 21st century is the era of marine economy.The Chinese government attaches great importance to the development and utilization of marine resources.With the support of national marine policies,the development of marine tourism industry in Yantai has changed with each passing day,and the content of tourism products developed by Yantai is also constantly innovating.In this study,by using literature research,data analysis and other methods,the development of marine tourism resources in Yantai was analyzed.The results show that the marine tourism products in Yantai are not well-known,less competitive,and are difficult to form a scale advantage.Therefore,some measures to promote the development of tourism industry in Yantai were proposed,such as optimizing and upgrading marine tourism products in Yantai,strengthening regional cooperation to increase product awareness,improving the structure scale of products in scenic spots to enhance competitiveness,attaching importance to the application of science and technology and strengthening product innovation.

China's Booming Machinery Industry——Modern enterprise management leading the Yantai CMC Bearings Co., Ltd. to prosperity

On July 3, 1994, recognized by the International DNV and the State Quality Appraisal Centre, the Yantai CMC Bearings Co., Ltd. was awarded the ISO9002 (87 version) certificate and gained three firsts—the first enterprise to obtain an ISO9002 certificate in the field of bearings production, in foreign trade circles and in Yantai: The ISO9002 (94 version) certificate was conferred on the enterprise after the first DNV reexamination in March 1995. Yearly growth in output and efficiency enables the enterprise to become the best in the bearings production field. It cannot be denied that the China National

YANTAI:GROWTH STAR ON THE COAST

The year 2018 marked the 40th anniversary of China’s reform and opening-up.Yantai,a city in eastern China’s Shandong Province,has been at the forefront of the country’s opening-up since 1978,especially after it was listed in 1984 as one of the first 14 coastal cities in China to open to the world.

Yantai Development Zone

The Yantai Development Zone belongs to Yantai City in Shandong Province, one of China’s first 14 open coastal cities. The district is situated on the blue sea northward and nestles among the green pine hills southward. Its construction area is 20 square kilometers, half of which has been built into a new industrial district, following ten years of construction. Mr. Hu Ping, Director of the Special Zone Office of the State Council, has inspected the area several times in recent years. He said, "Among all the development zones in China, Yantai is next only to Dalian in terms of construction."