摘要：针对现有叶菜收割机的割台和转向液压系统使用有待发展的问题,根据我国收割机实际使用需求,设计一种小型叶菜收割机液压传动系统,包括割台升降和前轮转向控制。对液压系统中执行元件、液压泵等主要元件进行选型,对液压缸的负载力、系统流量进行数值计算,并利用AMESim软件对液压系统进行建模,分析不同排量的液压泵对割台和转向液压缸工作情况的影响,确定选用3.3 mL/r的液压泵。分析定负载、变负载工况下割台液压缸的动态特性。研究结果表明:采用3.3 mL/r排量的液压泵,割台液压缸可以在3 s内达到最大行程,转向液压缸可以在6 s从初始位置达到最大行程,在变负载条件下,割台液压缸与定负载工况达到最大位移时间相差在1 s以内,满足使用需求。

摘要：基于有限体积方法,结合实测咸水数据及气候模式数据,构建了感潮河段枯水期水动力-盐度模型,并以受咸潮影响严重的闽江水口水库坝下至河口的感潮河段为例,探究了枯水期气候态条件下咸潮上溯特征及规律。结果表明:在枯水期,闽江感潮河段平均流量最小,气候态风场正值东北风向,综合作用下最易发生咸潮上溯;枯水期气候态大潮期间,河口水体混合强烈,闽江南港较北港上溯更强烈,上溯最严重时已危及城门水厂;枯水期气候态小潮期间,咸潮上溯程度整体强于大潮,南港的咸潮上溯界远于北港,落憩时水体分层明显,其余时刻水体混合强烈,上溯严重时马尾、炎山、城门水厂均于取用水高峰时段遭受影响。

摘要：In the present study, ultrasonic extraction technique （UET） is used to improve the yield of polysaccharides from Lami- naria japonica （LJPs）. And their antioxidative as well as glycosidase inhibitory activities are investigated. Box-Behnken design （BBD） combined with response surface methodology （RSM） is applied to optimize ultrasonic extraction for polysaccharides. The optimized conditions are obtained as extraction time at 54 min, ultrasonic power at 1050 W, extraction temperature at 80℃ and ratio of material to solvent at 1：50 （g mL-1）. Under these optimal ultrasonic extraction conditions, an actual experimental yield （5.75% ＋ 0.3%） is close to the predicted result （5.67%） with no significant difference （P〉0.05）. Vitro antioxidative and glycosidase inhibitory activities tests indicate that the crude polysaccharides （LJP） and two major ethanol precipitated fractions （LJP1 and LJP2） are in a concentration-dependent manner. LJP2 （30%-60% ethanol precipitated polysaccharides） possesses the strongest α-glucosidase in- hibitory activity and moderate scavenging activity against hydroxyl radicals （66.09% ±2.19%, 3.0 mg mL-l）. Also, the inhibitory activity against a-glucosidase （59.08% ± 3.79%, 5.0 mg mL-1） is close to that of acarbose （63.99% ± 3.27%, 5.0 mg mL-l）. LJP 1 （30% ethanol precipitated polysaccharides） exhibits the strongest scavenging activity against hydroxyl radicals （99.80%q-0.00%, 3.0mg mL-1） and moderate a-glucosidase inhibitory activity （47.76%± 1.92%, 5.0 mgmL-1）. LJP shows the most remarkable DPPH scav- enging activity （66.20%±0.11%, 5.0mgmL-1） but weakest a-glucosidase inhibitory activity （37.77%±1.30%, 5.0mgmL-1）. How- ever, all these LJPs exert weak inhibitory effects against a-amylase. These results show that UET is an effective method for extract- ing bioactive polysaccharides from seaweed materials. LJP 1 and LJP2 can be developed as a potential ingredient in hypoglycemic agents or functional food for the management of diabetes. This study provi

摘要：陕西民间布艺历史源远流长,受其地理、历史、人文环境影响发展而自成体系,形成造型拙朴别致,色彩浓烈而厚重的风格特点,其作品的物化效用与传统文化精神内涵,如何辈辈传承,值得深思和挖掘。文章从塑造方法切入,通过田野调查和资料分析,对陕西传统民间布艺进行分析归类,并对其表现形式深度剖析,找寻其中隐藏的设计文化规律,以期能为传承开发具有民族特色的布艺产品提供抛砖引玉的创新思维,并为西南地区各民族的布艺产品开发提供互鉴与融合之路径。

摘要：文化类综艺节目《书画里的中国》聚焦经典书画作品,以多种方式展现东方美学意境,实现中华优秀传统文化的创新性传播,对探寻融媒体背景下书画艺术的传播之道具有借鉴意义。本文认为《书画里的中国》在书画艺术的传播方面有较为突出的四个策略:精选信息的同时着力知识生产、在普及书画知识的基础上深挖内涵、以多元手法演绎传统书画、传播话语调适与传播内容共情。

摘要：文如其人、画如其人、"风格即其人"均说明了艺术家人格与创作间的密切关系,对于人格是如何影响艺术创作的研究却很罕见,显得更为迫切、重要。以梵.高为例,分别从题材选取、色彩运用、笔触线条使用等方面探讨艺术家人格对绘画创作的影响,认为艺术家人格影响艺术创作具有普遍性,人格是探讨艺术风格不可或缺的重要因素。

摘要：本文通过数值模拟计算并结合现场实测,开展了对施工过程中横通道围岩的演化规律的探究和对喷锚支护的受力分析,验证了喷锚衬砌支护方式的可行性。主要结论如下:(1)主洞开挖至距横通道约1洞径时,横通道围岩位移发生明显变化,拱腰处围岩位移最大达到9.79 mm;(2)横通道围岩竖向应力在施工中出现两次应力释放过程,第一次和第二次应力释放系数分别为20%和80%,而水平应力则基本在横通道开挖时才发生释放;(3)喷锚支护结构在拱顶、拱腰和仰拱处存在应力集中现象,衬砌最大应力仅达到5.39 MPa,喷锚支护的支护体系发生破坏的可能性较小。

摘要：OBJECTIVE:To explore the most effective parameters of Yi Zhi Chan Tuina manipulation for improving peripheral blood ***:A total of 45 volunteers were recruited from Pudong district in Shanghai,China,from October to December 2010,and randomly divided into nine groups using computer-generated random *** received Yi Zhi Chan Tuina manipulation on chengjin(BL 56) acupoint;each group received a particular combination of manipulation force and treatment *** used a two-factor,three-level factorial design to examine the effects of force and treatment time on changes in popliteal artery average volume flow,pulsatility index,and vessel diameter to determine the optimal parameter *** were assessed at baseline and after Tuina manipulation by interviewers blind to treatment group ***:After manipulation,two of the nine groups showed an increase in popliteal artery volume *** inter-participants effect test showed that for main effect of time,F = 0.331,P = 0.720;for main effect of force,F = 2.934,P = 0.066;and for the force-time interaction effect,F = 1.072,P = 0.385,indicating no interaction between force and ***,a pairwise comparison of the three levels of time showed that a treatment time of 10 min was significantly more effective than that of 2 min(P = 0.024).A pairwise comparison of light force,medium force,and heavy force showed a statistically significant effect for medium force(P = 0.035).CONCLUSION:Yi Zhi Chan Tuina manipulation with vertical force of 9.31 N for 10 min is most effective in improving peripheral circulation.

摘要：和谐是音乐的重要特征,它不仅自身是和谐的,其内涵与形式亦体现和谐,音乐能通过陶冶情操、启迪智慧、健体怡情、提高审美能力、培养合作能力等多方面促进人的和谐发展,从而有助于和谐社会的构建。

摘要：对于给定的一组运动输入参数,并联机构有可能出现构型分岔。为了使机构在连杆长度范围内能够随意运动,基于构型分岔进行了并联机构优化设计。在连杆空间分析并联机构运动状态的基础上,应用杆长向量表示了六自由度并联机构的16种极限构型。为避免机构出现构型分岔,利用同伦法和静态分岔条件,分析了极限构型的分岔特性,得到连杆的长度范围。对所设计的机构进行了运动可控制条件分析,以保证机构在整个杆长范围内可以控制。