关键词： 任鸿翔   渭水情   演奏体会   分寸感  

摘要： 琵琶曲《渭水情》是琵琶演奏家、教育家、作曲家任鸿翔先生于1984年创作的作品。这首作品以秦腔牌子曲《永寿庵》为素材创作的琵琶独奏曲,曲调旋律中无不洋溢着关中地区的风格特点,音符中浸透了对故乡由衷的眷恋和刻骨的思念之情。这首作品从问世起距今已有38年,经过时间的打磨和考验,这首作品历久弥新,至今仍被琵琶演奏者所喜爱。《渭水情》无疑是琵琶曲中经典的、极富生命力的作品。

关键词： 呼吸道病毒感染   流行特征   感染率   鼻咽拭子   儿科  

摘要： 目的调查儿科急诊入院患儿的新型冠状病毒(SARS-CoV-2)和其他呼吸道病毒感染的流行特征。方法该项前瞻性多中心队列研究,采集2020年4月-7月人院患儿的鼻咽拭子,采用PCR检测新型冠状病毒及其他呼吸道病毒,明确新型冠状病毒及其他呼吸道病毒的流行特征以及阳性结果相关的高危因素。

关键词： RCEP   农产品   出口潜力   一带一路”倡议   引力模型  

摘要： 农产品贸易始终是中国与RCEP其他成员的重要贸易领域,RCEP协定正式落地势必会进一步促进中国对这些国家的农产品出口。基于拓展的贸易引力模型,分析了国内生产总值、人口数量、农业用地面积、双边自由贸易协定、关税等因素对中国向RCEP其他成员出口农产品的影响,并基于模型结果对中国的出口贸易潜力进行了测算,同时对“一带一路”倡议前后的贸易潜力进行了分析。结果表明,国内生产总值的差值、农业用地面积的差值以及双边建立自由贸易协定对中国向RCEP其他成员出口农产品有正向促进作用;RCEP其他成员的初级加权平均关税、中国与RCEP其他成员的人口数量差值对中国出口有负向影响;中国对东盟、韩国、澳大利亚的农产品出口为潜力开拓型,中国对日本的农产品出口为潜力再造型,中国对新西兰的农产品出口在“一带一路”倡议提出之前为潜力巨大型,而在“一带一路”倡议提出之后为潜力开拓型。最后,针对结论提出了进一步释放中国对RCEP其他成员农产品贸易潜力的具体建议。

关键词： 消化道肿瘤   安罗替尼   多线治疗  

摘要： 目的观察安罗替尼单药与联合其他方案多线治疗老年消化道肿瘤患者的临床效果和安全性。方法收集2018年6月至2019年5月新疆医科大学附属肿瘤医院收治的老年消化道肿瘤患者(年龄≥60岁)50例,均接受安罗替尼单药或安罗替尼联合其他方案多线治疗,安罗替尼用法为12 mg/次,1次/d,连续用药2周,休息1周,3周为1个周期。记录患者相关临床信息、治疗方案、不良反应发生情况、近期疗效与远期生存情况。结果50例患者中有30例为安罗替尼单药治疗(单药治疗组),20例采用安罗替尼联合治疗(联合治疗组)。联合治疗组高血压、疲劳、肝功能损害、高三酰甘油血症和恶心呕吐发生率均明显高于单药治疗组,差异均有统计学意义(均P<0.05)。治疗后,50例患者中部分缓解者占4.0%(2/50),稳定和进展者各占48.0%(24/50),客观缓解率和疾病控制率分别为4.0%(2/50)和52.0%(26/50)。截至2020年3月,50例患者随访1~20个月,中位随访时间为9.5个月,中位无进展生存期(PFS)为6.0个月,中位总生存期为10.8个月。联合治疗组PFS及总生存期均长于单药治疗组,差异均有统计学意义(均P<0.05)。结论安罗替尼联合其他方案多线治疗老年消化道肿瘤的远期疗效优于单药治疗,但治疗期间需严密观察药物不良反应。

关键词： 原胶   成交价   华德  

摘要： 上海华宇2021秋拍(12.27)蟠龙西藏贴用新票11全四方连,原胶,其中1元四方连左上原票为“壹”字修饰变体(图1),成交价14.03万元(含买方佣金,下同)。1909年清政府在西藏开办邮局。总局设在拉萨,并在江孜、江达、帕克里、日喀则,亚东等地开设分局。开办初期,西藏和其他各地使用相同的邮票。后因币制不同,便委托英国华德路公司在无水印蟠龙票上加盖汉、英、藏3种文字的面值(11种),于1911年3月发售,限在西藏省内使用。由于时局动荡剧烈,这套邮票使用时间很短,发行数量稀少,2元票仅出售2700枚。

摘要： ~~

关键词： Stability   Delays   Torque   Galerkin method   Weight (Mass)   Rocks   Modeling   Trajectories (Physics)   Cutting   Drill strings   Equations of motion   Polycrystalline diamond compact bits   Vibration  

摘要： This work describes an alternative formulation of a system of nonlinear state-dependent delay differential equations (SDDDEs), which governs the coupled axial-torsional vibrations of a 2 DOF drillstring model with a realistic representation of polycrystalline diamond compact (PDC) bits. The regenerative effect associated with the complex cutter layout for such bits can introduce up to 100 state-dependent delays in the equations of motion. This large number of state-dependent delays renders the computational efficiency of conventional solution strategies unacceptable. The regeneration of the bottom-hole surface can alternatively be described by the bit trajectory function, whose evolution is governed by a partial differential equation (PDE). Thus the original system of SDDDEs can be replaced by a nonlinear coupled system of a PDE and ordinary differential equations (ODEs). Via the application of the Galerkin Method, this system of PDE-ODEs is transformed into a system of coupled ODEs, which can readily be solved. The algorithm is further extended to perform a linear stability analysis of the bit motion. The resulting stability boundaries are verified with time-domain simulations. The reported algorithm could, in principle, be applied to a more realistic drillstring model, which may lead to an in-depth understanding of the mitigation of self-excited vibrations through PDC bit designs.

关键词： adipofascial tissue   bridge principle   digital artery perforator flaps   digital propria artery   dorsal perforators   indirect transfer  

摘要： Background Dorsal digital soft tissue defects are considered among the most challenging to reconstruct. Numerous treatment options are proposed, including advancement flaps, antegrade, retrograde flow flaps, adipofascial flaps, and digital artery perforator flaps. However, the optimal treatment remains controversial. The concept of the "bridge principle," consisting of the indirect transfer of the flap to the defect area through a muscular bridge, has recently introduced by authors for medial canthal reconstruction. The aim of the study was to examine the feasibility of its application in digital reconstruction for dorsal defects and the development of a new flap. The utilization of the dorsal subcutaneous adipofascial digital or toe tissue as a "bridge" led to description and development of bridged digital artery perforator flaps as an alternative treatment of such defects. Methods From November 2017 to September 2019, a series of 14 patients (mean age of 57.1 years) suffered from dorsal digital or toe soft tissue defects of different dimensions and sustained reconstruction with this new technique. Results Twelve digits and 2 toes have been concerned. The mean size of the defects was 1.3 x 1.1 cm. All flaps survived without a sign of venous congestion. No functional digital or toe problems were observed during the follow-up period (mean of 11.6 months). Minor wound dehiscence presented in 2 cases (2 of 14 [14.3%]) and a transient skin swelling around the flap in 1. Conclusions A new concept was introduced to resolve a challenging problem. Initial outcomes are very encouraging. These flaps could be a valuable and reliable reconstructive option.

关键词： Aerosols  

摘要： Penetration of 3-10 nm particles through a metal grid has been measured using different experimental methodologies. Two basic schemes have been compared: (i) the upstream-downstream (UD), where particle penetration is determined from comparison between the aerosol number concentrations measured at two sampling points, one placed upstream, the other downstream, of the filter;and (ii) the filter-dummy (FD), in which penetration is determined from comparison of number concentrations measured at the outlet of two geometrically identical chambers, one empty and the other containing the filter. The test aerosol facing the grid was either monodisperse (MONO) or polydisperse (POLY). The UD method requires the additional measurement of particle penetration (without filter) through the flow path between the two sampling points and it is thus a more time consuming strategy, but it has the advantage that fabrication of an additional dummy holder is not needed. UD + MONO and FD + MONO gave results in good agreement with the well-established fan filter model theory of Cheng and Yeh. The results obtained with the FD + POLY method, the fastest one, were less precise and accurate. As far as diffusional capture of particles is concerned, the MONO method (using either the UD or FD basic schemes) should be preferred for accurate measurement of filter efficiency;the POLY method should perhaps be more suitable for a quick evaluation of the overall performance of a given filtration system.