消费价值观对新能源汽车购买意愿的影响研究

在补贴政策下滑之际,探究影响新能源汽车购买意愿的内在稳定因素尤为重要。以往学者主要采用计划行为理论,并因为没有考虑特定的因素而受到质疑。为此,本研究运用计划行为理论和价值–态度–行为模型,考察导致人们做出特定行为的原始驱动力(价值观)对新能源汽车购买意向的影响。通过构建结构方程模型进行假设检验,研究发现:绿色消费价值观和创新价值观会正向影响购买态度,且绿色消费价值观对态度的影响程度更大;同时态度对意愿也会有显著影响;此外,绿色消费价值观和创新价值观均会直接影响新能源汽车购买意愿,且创新价值观的直接影响更大。基于以上结论,本研究为后补贴时代新能源汽车市场化发展提供了方向,丰富了价值观对新能源汽车购买意愿的影响研究。

风力机叶片旋转平面内弯曲对动力学响应的影响

采用变分渐近梁截面分析方法(VABS)精确计算旋转平面内弯曲的复合材料叶片截面特性,耦合空间一维Euler-Bernoulli梁模型,分析了不同弯曲幅度对考虑弯扭耦合特性的风力机叶片动力学性能的影响。并采用非定常叶素动量理论,考虑动态入流和动态失速模型求解叶片的气动载荷,分析了叶片前掠和后掠在相同控制策略时各风速下对气动功率的影响,以及在极端阵风条件下的气动弹性响应情况。结果表明叶片弯曲对截面特性和前几阶的固有频率的影响较小,但在扭转方向具有较大影响。同时在相同控制策略下,叶片后掠会使风力机的功率降低,但能有效降低极端阵风下的载荷波动。

截面参考系对采用梁模型风力机叶片的动态性能影响分析

采用变分渐近梁截面分析方法(VABS)精确计算复合材料叶片的截面特性,并耦合一维Euler-Bernoulli梁模型,分析基于不同截面参考坐标系对计算叶片动力学特性精度的影响。其结果与ANSYS计算结果进行对比分析,结果表明精确的截面特性与梁模型结合可实现与三维壳单元相似的计算精度,同时也发现若考虑叶片的弯曲与扭转方向耦合,截面参考系应选在剪切中心。在此基础上,采用非定常叶素动量理论求解叶片气动载荷,分析不同参考系对叶尖位移响应和叶根载荷的影响。

EXCEL VAB在水准测量内外业自动运算中的应用

本文的创新之处在于通过EXCEL与VBA结合,将水准测量的外业计算、站上计算和内业计算完全整合在同一界面下,自动完成计算、检查精度并现场完成全部内业计算。

双圆弧齿轮参数化设计研究

在Inventor软件平台上对双圆弧齿轮进行虚拟设计,并使设计的零件具有参数化、变量化的特性。在草图环境下绘制齿廓曲线时,可采用交互式或者利用Inventor内嵌二次开发软件VBA编制程序自动绘制。为了得到螺旋扫略所需的螺距,引入了CAGD作为辅助设计手段,使建模所需的参数求解高效、准确并具有参数化特性。所设计的零件可为进一步的应力、应变分析,空间运动分析,数控加工等打下坚实基础。

基于Inventor的双圆弧齿轮虚拟设计与研究

可视化设计和三维设计是现代设计的发展趋势。在Inventor软件平台上对双圆弧齿轮进行虚拟设计,并使设计的零件具有参数化、变量化的特性。在草图环境下绘制齿廓曲线时,可采用交互式或者利用Inventor内嵌二次开发软件VBA编制程序自动绘制。为了得到螺旋扫略所需的螺距,引入CAGD作为辅助设计手段,使建模所需的参数求解高效、准确并具有变量化特性。该设计方法为进一步的应力、应变分析,空间运动分析,数控加工等打下坚实基础。

Aeroelastic Responses for Wind Turbine Blade Considering Bend-Twist Coupled Effect

The Euler-Bernoulli beam model coupled with the sectional properties obtained by the variational asymptotic beam sectional analysis(VABS)method is used to construct the blade structure model.Combined the aerodynamic loads calculated by unsteady blade element momentum model with a dynamic inflow and the dynamic stall correction,the dynamics equations of blade are built.The Newmark implicit algorithm is used to solve the dynamics equations.Results of the sectional properties and blade structure model are compared with the multi-cell beam method and the ANSYS using shell elements.It is proved that the method is effective with high precision.Moreover,the effects on the aeroelastic response caused by bend-twist coupling are analyzed.Torsional direction is deflected toward the upwind direction as a result of coupling effects.The aerodynamic loads and the displacement are reduced.

Improvement of silty clay by vacuum preloading incorporated with electroosmotic method

A laboratory test was performed to assess the effectiveness of vacuum preloading incorporated with electroosmotic (EOM) treatment on silty clay (combined method) for reclamation projects like new disposal ponds, where the horizontal electrode configurations beneath the soil layer were possible and the drainage pipes and the prefabricated vertical drains (PVDs) system could be easily installed in advance before the sludge dragged from sea bed or river bed was filled into the site. Three groups of tests were conducted on the silty clay from Qinhuai River in Nanjing, China. The model is able to apply vacuum pressure at the bottom of the soil layer and a direct current electric field simultaneously. It is also possible to measure the pore pressures at different depths of soil column, and the changes in settlement and volume with the elapsed time. In this study, the vacuum preloading method, vacuum preloading applied at the bottom (VAB method), was applied and the cathodes were installed beneath the soil layer. The results obtained indicate substantial reduction in water content, and increases in dry density and undrained shear strength in comparison with those obtained by the vacuum preloading only, particularly at the positions close to the anode. The combined method utilizes the vertical drainage flow created by the electroosmosis integrating the horizontal drainage flow created mostly by the vacuum pressure. The total drainage flow can be calculated as a result of the vertical drainage flow by electroosmosis only and the horizontal drainage flow by the vacuum preloading only. The way of placement of the cathode and the anode in the combined method also overcomes the disadvantage of EOM method itself, i.e. the appearance of cracks between the anode and the surrounding soil. Moreover, it is observed that the vacuum preloading plays a primary role in earlier stage in deduction of free pore water; meanwhile, the electroosmotic method is more efficient in later stage for absorbing water in the diffused double layers of soil.

Is sentinel lymph node biopsy necessary for the patients diagnosed with breast ductal carcinoma in situ using core needle biopsy or vacuum-assisted biopsy as the initial diagnostic method？

Axillary lymph node status is one of the most important prognostic indicator of survival for breast cancer, especially in ductal carcinoma in situ （DCIS）. The purpose of this study was to investigate whether sentinel lymph node biopsy （SLNB） should be performed in patients with an initial diagnosis of DCIS. Methods： A retrospective study was performed of 124 patients with an initial diagnosis of DCIS between March 2000 and June 2014. The patients were treated with either SLNB or axillary node dissection during the surgery, and we compared the clinicopathologic characteristics, image features, and immunohistochemical results. Results： Eighty-two patients （66.1%） had pure DCIS and 25 （20.2%） had DCIS with microinvasion （DCISM）, 17 （13.7%） updated to invasive breast cancer （IBC）. 115 patients （92.7%） underwent SLNB, among them, 70 patients （56.5%） underwent axillary node dissection. 3 of 115 patients （2.6%） had a positive sentinel lymph node, only 1 （1.4%） of 70 patients had axillary lymph node metastasis, in 84 patients （66.7%） who were diagnosed DCIS by core needle biopsy （CNB） and vacuum-assisted biopsy （VAB）. 26 patients （31.0%） were upstaged into IBC or DCISM in the final histological diagnosis. The statistically significant factors predictive of underestimation were large tumor size, microcalcifications, comedo necrosis, positive Her-2 status, negative estrogen receptor status. Conclusion： The metastasis of sentinel lymph nodes in pure DCIS is very low, but the underestimation of invasive carcinoma in patients with an initial diagnosis of DCIS is an usual incident, especially in the cases when DCIS is diagnosed by CNB or VAB. Our findings suggest patients presenting with a preoperative diagnosis of DCIS associated with large tumor sizes, microcalcifications, comedo necrosis, positive Her-2 status, negative ER status are more likely to be DCISM and IBC in final diagnosis. SLNB should be performed in this part of patients.

利用VBA处理邻近气象站的相关遥测数据

在水文遥测雨量站站点,由于仪器故障以及数据传输丢失,会导致遥测数据缺损。以襄阳局JDZ05-01型翻斗式雨量器遥测数据处理为例,结合《水文资料整编规范》SL247-1999中的相关规定:缺测之日,可根据地形、气候条件和邻近站降水量分布情况,采用邻站平均值法、比例法或等值线法进行插补。利用VAB借用邻近气象站雨量资料弥补整编数据。此种方法避免了人工计算、插图等繁琐的雨量查补过程,具有一定的推广意义。

AutoCAD2000平台下数据库技术在选煤厂设备图库管理中的应用

本文针对选煤厂设备及零部件较多的特点，利用AutoCAD2000的开放式文件系统和VBA（Visual Basic Application）后台数据库编程功能，对选煤厂设备图库进行可视化管理，便于查询、修改和利用，提高工作效益。

Comparison of the underestimation rate in cases with ductal carcinoma in situ at ultrasound-guided core biopsy: 14-gauge automated core-needle biopsy vs 11-gauge vacuum-assisted biopsy

Objective： The objective of this study was to compare the underestimation rate of invasive carcinoma cases with ductal carcinoma in situ （DCIS） at percutaneous ultrasound-guided core biopsies of breast lesions between 14-gauge automated core needle biopsy （ACNB） and 11-gauge vacuum-assisted biopsy （VAB）, and analyze the diagnostic advantages and insufficiencies in DCIS between this two methods, and to determine the relationship between the lesion type （masses or microcalcifications on radiological findings ） and DCIS underestimation rate. Methods： We collected 152 breast lesions which were diagnosed as DCIS by retrospectively reviewing data about ultrasound-guided biopsies of breast lesions （from February 2003 to July 2010）. There were 98 lesions in 95 patients by 14-gauge ACNB, and 54 lesions in 52 patients by 11-gauge VAB （The system used in this study called Mammatome, MMT）. The clinical and radiological findings were reviewed; meanwhile all the selected patients had histological results of the biopsies and follow-up surgeries which also achieved the reliable pathological results to compare with the biopsy results. The differences between two correlated histological results defined as underestimation, and the histological DCIS underestimation rates were compared between the two groups. According to the radiological characteristics, each group was classified into two subgroups （masses or micrecalcifications group）, and the differences between subgroups were also analyzed. Results： The DCIS underestimation rate was 45.9% （45/98） for 14-gauge ACNB and 16.6% （9/54） for MMT. According to the lesion type on ultrasonography, DCIS underestimation was 31.0% （26/84） in masses （43.1% using ACNB and 12.1% using MMT; P = 0.003） and 42.6% （29/68） in microcalcifications （48.9% using ACNB and 23,8% using MMT; P = 0,036）, Conclusion： The underestimation rate of invasive carcinoma in cases with DCIS at ultrasound-guided core biopsies is significantly higher for ACNB than for MMT. Furthermore, this difference does not alter among the two lesion types presented on ultrasonography. So ultrasound-guided VAB （MMT system） could be an effective and useful method for the diagnosis of DCIS lesions no matter what the lesion type is.

基于ExcelVBA的隧道施工中盾构姿态测量的研究

介绍了盾构隧道施工时,盾构姿态确定的观测方法,推导了通过观测安装在盾构壳上的棱镜,计算盾构特征点坐标的数学模型,并基于Excel VBA验证了算例,实践证明了该技术方法的可靠性。

美国视频广告局VAB：OTT视频是付费电视的补充而非取代

尽管目前付费电视行业都在对“掐线”现象进行自我反省，但新的数据表明传统有线电视订阅远远没有过时。美国视频广告局（VAB）的一份报告显示，对于用户来说，虽然有了新的流媒体服务这一选择，但在过去五年里，美国订阅有线电视服务的电视家庭占比稳定于83％（9800万家庭）的比例。当电视家庭确实必须使用流媒体服务（OTT家庭）时，他们大多数（71％）是与有线电视服务一起订阅，而非放弃使用有线电视服务。

经营平价商品不是电信发展之道 Virtela公司CEO Vab Goel访谈

Virtela公司成立于2000年,总部在美国科罗拉多州丹佛,是一家专注为大型跨国企业用户提供网络解决方案的公司。Virtela自己不拥有网络,但通过应用高级工具对成本、需求、应用和安全等方面的分析,向用户提供跨多个运营商的网络解决方案和支撑服务。一个不拥有网络资产、但是拥有咨询和服务智能的小公司,利用IP开放架构绕过了传统运营商多年建设网络的艰辛历程,在几年内做到全球化,这带给我们的思考是足够震惊的。我们以前一直认同并想维护的电信业的规则正在被改变。Virtela的思路是:随着网络演进的加速,成功的决定性因素是加快市场步伐、研究新的商业合作模型和开放网络模型,而不是加强端到端的控制,那些想拥有全球网络的运营商在未来几年内会消失。本文是基于TelecomAsia(亚洲电信)杂志编辑JosephWaring在2005年4月对Virtela公司CEOVabGoel先生的采访记录,经编译而成。

VAB:地球上的太空丰碑

美国的阿波罗载人登月计划创造了人类的奇迹。这个大奇迹是由许多小奇迹积累起来的,包括众所周知的土星5号火箭、阿波罗飞船等等。今天,我们来说一说其中的一个小奇迹——VAB。开“三垂”先河VAB是运载火箭装配大楼(Vehicle Assembly Building)的英文缩写,它最初名为垂直装配大楼(Vertical Assembly Building)。

NAB花开上海 多元化绽放精彩--2017 NAB Show Shanghai成功举办

6月13日至15日．2017NAB Show Shanghai在上海新国际博览中心举办。上海国际电影电视节是国内重要的大型文化活动和国际影视行业交流盛会，NAB Show是全球顶尖的广播电影电视与数字媒体娱乐大展。NAB Show Shanghai自2015年登陆中国．致力于打造成为让中国及亚太地区从业人员能够体验与展示全球最前沿创新数字媒体科技、捕捉全球创新商业及科技业态、聚集及结交全球商业及技术菁英的国际级顶尖盛会。

新世纪的法兰西利剑

随着世界多极化的格局形成，法兰西陆军面临机遇和挑战。法国将在现代技术和战斗理念更新发展的基础上，迎接机遇面对挑战。

2020—2021年度“炫不可挡”中青年医师VABB手术视频大赛征集通知

为更好地交流乳腺微创和功能诊疗的现状.分享超声引导下真空辅助乳腺肿瘤微创旋切手术(VABB)的操作流程及技巧,提升中青年医生的诊疗水平,推动VABB手术操作的规范化发展,中华外科杂志编辑委员会拟于2020--2021年度举办“炫不可挡”中青年医师VABB手术视频大赛"。

真空辅助乳腺活组织检查的专家共识与操作指南解读

随着微创外科技术的进步,乳腺疾病的手术治疗也逐渐向减少损伤和微创的方向发展。其中,真空辅助乳腺活组织检查(vacuum-assisted breast biopsy,VABB)作为一种新的乳腺外科手术方式,已广泛用于临床。由于操作者对手术适应证、操作要点等方面的理解和掌握不尽相同,VABB在临床应用过程中尚存在一些问题,有可能影响该技术的临床应用。