Land Remediation Projects in Poverty-stricken Counties in Tibetan Areas Promoting Poverty Alleviation——A Case Study of Songpan County,Sichuan Province

Songpan County is a poverty-stricken county in the four provinces of China,one of the concentrated areas in China. This paper analyzes the effectiveness of land consolidation in Songpan County to promote poverty alleviation and development through specific cases. The results show that land remediation has improved agricultural production conditions,promoted agricultural efficiency,increased farmers' income,improved rural living conditions,promoted the development of urban and rural integration,improved the ecological environment,solved the problem that restricts the survival and development of poverty-stricken areas,enhanced the ability of farmers to develop themselves,raised the level of civilization in rural areas,and promoted poverty alleviation and development. The poverty alleviation and development has provided certain financial support for land remediation. It has promoted land remediation,and pointed out key directions for land remediation. It has an indirect promotion effect on land remediation.

Multi-level Cooperation and Complementary Advantage Poverty Alleviation Model in Poverty-Stricken Counties of Tibetan Areas:A Case Study of Songpan County in Sichuan Province

Songpan County is a poverty-stricken county in Tibetan areas of Sichuan Province,it belongs to a concentrated poverty-stricken area in China.Through summarizing the specific conditions of multi-level cooperation and complementary advantage poverty alleviation model in Songpan County,this paper analyzed the effect of this model.Through the analysis on the cooperative poverty alleviation model(eastern-western cooperation,provincial targeted assistance,county-wide"four-leading and four-assistance"inner-party assistance,social force"10000 enterprises helping 10000 villages",and"visiting every household and keeping every person busy"),it summarized the implementation and actual results of each level.In addition,it summarized the problems encountered in the implementation process of multi-level cooperation and complementary advantage poverty alleviation model and came up with recommendations.With the aid of this successful multi-level cooperation and complementary advantage poverty alleviation model,Songpan County has achieved a decisive victory in the fight against poverty.At the end of April 2019,the poverty rate in the whole region fell to 0.45%,and it successfully took off the poverty hat.This paper analyzed and refined the specific practice,main achievements,successful experience,implications and reference significance of multi-level cooperation and complementary advantage poverty alleviation model,to provide necessary references for innovation of poverty alleviation model in poverty-stricken Tibetan areas,or even other similar provinces and regions.

柔性PAN/TMAB复合纳米纤维膜的压电性能研究

自供电柔性压电纳米发电机因其优异的压电性、良好的柔性和舒适性引起了广泛的关注。通过静电纺丝技术制备了聚丙烯腈(PAN)掺杂三甲基氨硼烷(TMAB)柔性全有机复合纳米纤维膜。系统地研究了纺丝电压和辊筒转速对复合纳米纤维膜压电和铁电性能的影响。结果表明:在纺丝电压为21 kV和辊筒转速为1000 r/min时,PAN/TMAB复合纳米纤维膜的输出性能最佳,输出开路电压和短路电流可达2.60 V和0.59μA。在同样的纺丝条件下,剩余极化强度最大值为0.34μC/cm^(2)。经过6000次敲击循环测试,所制备的PAN/TMAB复合纳米纤维膜输出电压保持稳定。PAN/TMAB复合纳米纤维膜可实时监测手指关节弯曲,行走和跳跃等状态,在可穿戴电子领域有着潜在的应用前景。

The Evolutionary Characteristics of the Temperature in Typical Counties in Southwest China——Taking Meitan County in Guizhou Province as an Example

Based on the method of linear trending,analysis was made upon the daily temperature statistics of Meitan County from 1951 to 2009,and the results showed that the temperature in general was on the rise.With 1980 as the turning point,it was on the decline before while later the temperature increased quickly.Among these figures,the variation rates of annual average temperature,annual maximum temperature,and annual minimum temperature are 0.11 ℃/10 a,0.08 ℃/10 a,and 0.36 ℃/10 a.The variation rates of average temperature in spring,summer,fall and winter are respectively 0.12 ℃/10 a,0.07 ℃/10 a,0.12 ℃/10 a,and 0.13 ℃/10 a.Morlet wavelet was adopted to analyze the periodicity of temperature change which has periods of different scales.But since 2000,during different time scales most of the areas have been in the period of temperature rises.Besides,certain rule exists in the periodicity of maximum temperature and minimum temperature.Before 1970s,they had opposite changing rules,and the alteration of the peak value occurred.However,in the late 1980s,they had similar changing rules,and their peak values appeared at the same time.It means that against the background of global warming,the reaction of temperature evolution in Meitan County is quite remarkable.

SWOT Analysis of Tourist Resources in Underdeveloped Counties—With Pingle County in Guilin City as the Study Case

Strengths,weaknesses,opportunities and threats of tourism development in Pingle County were analyzed to give a pertinent guide for its under developed tourism industry and economy,moreover,suggestions were proposed for the further development of local tourist resources.

高效低时延分级多PAN太赫兹无线网络MAC层优化协议

针对现有分级多PAN太赫兹无线网络MAC(Medium Access Control)协议中存在的子网形成方案不合理以及私有CTA(Channel Time Allocation)与子网内实际负载不匹配等问题,提出了一种高效低时延的MAC层优化协议.该协议采用基于泛听的按需形成子网机制避免了子网分布不均匀以及因子网形成后没有节点加入而造成的私有CTA资源浪费的问题.在子网形成后,子微微网协调器(Piconet Coordinator,PNC)根据子网内实际负载情况自适应选择私有CTA时隙资源优化机制,让有数据传输需求的节点及时将数据发出.仿真结果表明,所提出的方案能有效地降低数据帧平均接入时延,提高吞吐量以及数据帧的传输成功率.

ZnO@PAN柔性复合纳米纤维膜的制备及压电特性

采用静电纺丝技术,通过两步低温水热法制备了ZnO@聚丙烯腈(PAN)柔性复合纳米纤维膜。研究了静电纺丝电压和滚筒转速对ZnO@PAN柔性复合纳米纤维膜压电和铁电性能的影响。研究结果表明,当静电纺丝电压为20 kV、滚筒速度为1000 r/min时,ZnO@PAN柔性复合纳米纤维膜的输出性能达到最佳,输出开路电压可达到5.5 V,短路电流可达到0.61μA,剩余极化强度可达到0.43μC/cm^(2)。在外部负载电阻为13 MΩ时,柔性复合纳米纤维膜达到最大输出功率0.63μW。经过5000次循环敲击测试,所制备的ZnO@PAN柔性复合纳米纤维膜输出性能保持稳定。通过ZnO@PAN柔性复合纳米纤维膜可实时监测握力器微握、半握、全握三种不同的状态,在自供电柔性压力传感器领域有着广阔的应用前景。

PAN、PVA、PP纤维水泥基复合材料力学性能研究

通过单掺、复掺聚丙烯腈(PAN)纤维、聚乙烯醇(PVA)纤维和聚丙烯(PP)纤维3种纤维,对比分析纤维种类和纤维掺量对3 d、28 d水泥基复合材料抗折强度、抗压强度的影响,并采用扫描电子显微镜观察纤维在水泥基复合材料中的分布状态探讨作用机理。结果表明:单掺PAN纤维对水泥基复合材料28 d抗折强度效果最好;单掺PVA纤维对水泥基复合材料28 d抗压强度提升效果最大;单掺PP纤维对水泥基复合材料3 d抗折强度和抗压强度均作用明显。复掺时,当PAN纤维掺量为0.8%,PVA纤维掺量为0.2%时,水泥基复合材料28 d抗折强度最高,可达9.728 MPa;当PVA纤维掺量为0.8%,PAN纤维掺量为0.2%时,水泥基复合材料28 d抗压强度最高,可达41.92 MPa。

CBCT与PAN预测下颌近中低位阻生第三磨牙拔除术损伤水平的临床比较

目的:运用锥形束CT(CBCT)及口腔曲面断层片(PAN)引导拔除下颌近中低位第三磨牙,探讨CBCT作为术前预测手段是否存在优越性。方法:选取于2022年1月至2023年8月在石河子大学第一附属医院就诊的213例患者,分为PAN组和CBCT组,对两组患者分别进行拔牙手术,采集患者术前及术后龈沟液并采用酶联免疫吸附实验(ELISA)测定炎症及疼痛因子浓度;运用统计学方法对比两组在各类指标的差异性。结果:CBCT作为术前评估手段相较传统PAN在明确牙根与MC接触关系上具有优越性(P <0.05),且CBCT组手术时间短、手术并发症发生率低(P <0.05);通过ELISA测定结果得出CBCT组患者龈沟液中炎症因子及疼痛因子的术前术后浓度变化值相较PAN组浓度变化值低(P <0.05)。结论:CBCT相比PAN在评估牙根与下颌管(MC)接触关系这类风险因素方面具有优越性,且应用CBCT作为术前评估手段进行拔牙手术其手术时间短,并发症少,术后损伤小。

不同种属来源CK(pan)抗体在透明细胞腺癌中的表达差异研究

目的 应用免疫组化比较不同种属来源CK(pan)抗体在透明细胞腺癌(CCA)中的表达。方法 选取30例透明细胞腺癌石蜡标本,采用两种不同种属来源抗体:鼠单抗(克隆号:BP6051)和兔多抗(无克隆号),分别检测其在透明细胞腺癌中的表达。结果 鼠单抗CK(pan)在透明细胞腺癌中的阳性率为40%(12/30),染色强度为弱至中等染色,剩余60%(18/30)为假阴性。兔多抗CK(pan)在透明细胞腺癌中的阳性率为100%(30/30),染色强度为强染色。结论 鼠单抗(克隆号:BP6051)在透明细胞腺癌中的免疫组化染色结果的假阴性率太高,推荐免疫组化染色时采用兔多抗CK(pan)。

Research on Competitiveness of County Economy Based on Factor Analysis and Cluster Analysis——Taking 88 Counties in Guizhou as Samples

17 indices are selected,such as the growth rate of total regional output value,the proportion of tertiary industry in GDP,per capita financial expenditure,and soil erosion rate of Guizhou Province in 2009.According to the relevant indices data of statistical yearbook and governmental website,by using the method of factor analysis and the method of cluster analysis,we assess the competitiveness of county economy in 88 counties of Guizhou Province.The results show that the competitiveness of county economy in Guizhou Province is impacted by factors of location and economic foundation.In addition,the resources environment,economic structure,economic developmental speed and other factors also impact the competitiveness of county economy in Guizhou Province.Based on these,in the light of the developmental characteristics of different counties in conjunction with different developmental advantages in different regions,we should adopt different developmental strategies according to local conditions,which is significant to rapid,healthy and sustainable development of county economy in Guizhou Province.

Countermeasures for Stressing Industry but Disregarding Agriculture in Resource-based Counties: A Case Study of Fugu County in Shaanxi Province

Industry re-feeding agriculture is an important strategy to boost agricultural modernization[1]. As to resource-based regions, the key thing is the way to implement the strategy of resource-based industry re-feeding agriculture. In fact, as a typical resource-based county, Fugu County realizes its quick economic development mainly depending on the local resources and industrial development. And the agricultural development is relatively lagging in the county, more people are beginning to denote themselves to industrial development due to high return brought by resource exploitation, which results that the contradiction between industry and agriculture is gradually prominent in the county. Therefore, it is necessary to seek for a new way to develop industry and agriculture in resource-based counties. This article mainly introduces the mode and method of "industry re-feeding agriculture" in Fugu County, analyzes and summarizes the implementation effects and achievements of modes as well as discusses the problems produced in the course of policy implementation and tries to find countermeasures to coordinate the contradiction between industry and agriculture, then further discuss the development perspective of industry and agriculture in Fugu County.

Distribution characteristic and geological signiflcance of rare earth elements in Lopingian mudstone of Permian,Panxian county,Guizhou province

In order to discuss the geochemical characteristic of REEs （rare earth elements） and their geological application, we measured the contents of rare earth elements, trace elements and minerals of 29 Lopingian （Late Permian） mudstone samples in Panxian county, carrying out ICP-MS and XRD analysis. The results show that the amount of REEs （185.56-729.46 ×10-6） is high. The ratios of w（LREE）/w（HREE） （6.84- 13.86） and W（La）N/w（Yb）N （1.01-3.02） show clear differentiation of LREEs and HREEs. ZREE has a significantly or critically positive correlation with lithophile elements Th, Nb, Ta, Ti, Ca, Sc, Cs, Zr, Hf, Sr, Be and chaicophile element Zn, a critically negative correlation with siderophile element Fe and a slightly positive correlation with illite, illite smectite mixed layers and siderite. REEs originate mainly from terrigenous minerals, in an inorganic phase, Source rocks of our samples consist of Emeishan basalt and a small part of sedimentary rocks, as suggested by the distribution patterns of REEs and w（∑REE）- w（La）/w（Yb） diagram. Moreover, abnormal surfaces near the sequence boundaries （SB2, SB3, SB4） are related wiLth the boundaries, identified by geochemical characteristics of the REEs, such as ∑REE. w（LREE）/w（HREE）, Eu/Eu＊ and Ceanom.

基于BTO/PAN复合纳米纤维膜的柔性压电纳米发电机

采用简单的一步水热法合成了钛酸钡纳米颗粒(BTO NP),通过静电纺丝法制备了BTO/聚丙烯腈(PAN)复合纳米纤维膜,并基于该膜制备了柔性复合压电纳米发电机。研究结果表明,随着BTO掺杂质量分数的增加,BTO/PAN柔性复合压电纳米发电机的输出电压先增大后减小。当BTO的质量分数为15%时,BTO/PAN柔性复合压电纳米发电机的输出性能最佳,输出电压可达10.2 V,输出电流可达1.52μA。当负载电阻为12 MΩ时,其最大输出功率约为3.72μW,与纯PAN纳米纤维膜压电纳米发电机相比,输出性能有明显改善。经过5000次循环测试结果表明,BTO/PAN柔性复合压电纳米电机的的输出性能没有明显变化,因此其具有较好的稳定性。同时,该压电纳米发电机能够检测人体的不同状态,为研发高性能和自供电的可穿戴生物电子产品提供了参考。

参芪蛭龙汤含药血清对PAN损伤MPC5细胞凋亡的抑制作用

目的探讨参芪蛭龙汤含药血清对puromycin aminonucleoside(PAN)损伤MPC5细胞凋亡的抑制作用。方法制备参芪蛭龙汤大鼠含药血清。MPC5细胞随机分为空白组、模型组、给药组,空白组和模型组用10%大鼠空白血清干预,给药组用10%参芪蛭龙汤含药血清干预,培养24 h后,模型组和给药组加入50 mg/L的PAN干预24 h后,倒置显微镜下观察MPC5细胞的形态结构,MTS法检测细胞增殖,Hoechst33342/PI染色法检测细胞凋亡,AnnexinV-FITC/PI双染法检测细胞凋亡,Western-blot法检测MPC5细胞中BAX、Bcl-2、Caspase-3、Nephrin、Podocin蛋白的表达。结果与模型组比较,足突结构较明显,数量较多;能够促进PAN处理后MPC5细胞的增殖(P<0.05);降低细胞凋亡率(P<0.05,P<0.01);降低细胞中Bax蛋白的表达(P<0.01)、降低cleaved-Caspase-3/Caspase-3蛋白比值(P<0.05),升高Bcl-2、Nephrin蛋白的表达(P<0.05,P<0.01)。结论参芪蛭龙汤能够修复裂孔隔膜蛋白、减少足细胞凋亡,对维持肾小球的正常滤过功能具有改善作用,从而减少蛋白尿。

KH-560处理时间对PAN基碳纤维沥青复合材料性能的影响

以硅烷偶联剂KH-560改性的PAN基碳纤维为添加材料,制备了不同KH-560处理时间的PAN基碳纤维沥青复合材料。通过车辙试验、冻融劈裂试验和间接拉伸疲劳试验等研究了KH-560处理时间对沥青复合材料高温稳定性、低温抗裂性、水稳定性、疲劳性能和吸声性能的影响。结果表明,经过KH-560处理后的PAN基碳纤维表面的粗糙度增加,当KH-560处理时间为2 h时,纤维凹槽较深,与沥青的作用面积增大,纤维在复合材料中形成了致密网状结构,增强了PAN基碳纤维复合材料的稳定性。当KH-560处理时间为2 h时,PAN基碳纤维沥青复合材料的高温性能、低温抗裂性能、水稳定性和疲劳性能均最佳,此时其45和60 min的变形量、破坏劲度模量达到最小值,分别为1.851和2.117 mm、2 201 MPa;动稳定度、劈裂抗拉强度和破坏拉伸应变达到最大值,分别为3 077次/mm、4.6 MPa和3479με。在250~1 000 Hz和1 000~1 600 Hz范围内,当KH-560处理时间为2 h时,沥青复合材料的平均吸声系数均达到最大值,分别为0.116和0.127,较未处理的沥青复合材料分别提高了39.76%和45.98%,吸声降噪性能提升显著。综上可知,KH-560的最佳处理时间为2 h。

苏皖鲁豫典型城市过氧乙酰硝酸酯(PAN)污染特征分析

为探究苏皖鲁豫区域光化学污染特征,于2021年10月和2022年6月在淮北市开展光化学污染产物过氧乙酰硝酸酯(peroxyacetyl nitrate,PAN)的在线监测,分析了PAN浓度特征、空间来源、产生速率和变化趋势.观测结果表明,观测处2021年10月PAN的浓度范围为(0.08—1.44)×10^(−9),2022年6月的浓度范围为(0.61—5.72)×10^(−9);PAN的峰值大部分出现在NO/NO_(2)比值较低的时段.结合气团后向轨迹,2021年10月观测处PAN的潜在源贡献函数(PSCF)高值区范围出现在南部方向,可能是因为西南方向相近城市较高的前体物排放;2022年6月高值区主要出现在北部和东南部,显示山东省西南部是潜在源贡献地区,东南方向的气团在工业化程度较高的城市群之间存在长距离运输.

Research on the Impact of Industrial Agglomeration and Structural Upgrade on County Economic Growth under the New Normal Condition-Based on the Empirical Study of 101 County Counties in Jiangsu and Zhejiang Provinces

In this paper, the method of generalized moments of data and systems for 101 counties in Jiangsu and Zhejiang Provinces is used to analyze the impact of industrial agglomeration and industrial structure upgrading on county economic growth. The real diagnosis result indicated that, the industry gathers with the industrial structure promotes has the forward function to the county territory economic growth rate, in the sample time that had not discovered the industry gathers to the economical growth existence non-linearity in？ uence. On the other hand, the industrial structure promotes to the county territory economy long-term growth power is stronger, later period should break through the present stage in the manufacturing industry mature county territory through the industrial structure promotion strategy the industry to glide down.

静电纺PAN/TiO_(2)/Ag纳米纤维膜空气过滤性能研究

为获得高效低阻的过滤材料,将纳米银(Ag)颗粒和二氧化钛(TiO_(2))共混在聚丙烯腈(PAN)纺丝液中,采用静电纺丝法制备PAN/TiO_(2)/Ag纳米纤维膜。研究了纳米纤维膜的微观形貌、透气和透湿性能、过滤性能、力学性能等。结果表明:加入纳米Ag颗粒后,PAN/TiO_(2)/Ag纳米纤维的直径和标准差均呈现减小趋势,当纺丝时间为40 min、Ag质量分数为1.25%时,得到的纳米纤维膜的综合性能优异,其过滤效率98.68%,阻力压降80 Pa,品质因子达到0.05409 Pa^(-1)。认为:静电纺PAN/TiO_(2)/Ag纳米纤维膜为新型高性能空气过滤器的开发提供了新途径。

静电纺PAN/CNCs锂离子电池隔膜复合材料的碳化工艺探究

隔膜是锂离子电池结构中的关键组件,开发以生物基原料为主的电池隔膜对电池行业的绿色可持续发展有重要意义。本文以纤维素纳米晶(CNCs)和聚丙烯腈(PAN)为主要材料,通过静电纺丝技术制备PAN/CNCs复合纤维膜,并对所得纤维膜进行预氧化及碳化处理,得到碳化复合膜。对所得碳化复合膜的结构与性能进行测试分析,探究电纺溶液组成、聚乙烯吡咯烷酮(PVP)添加和预氧化-碳化工艺参数对其结构性能的影响。结果表明,PAN/CNCs质量比、PVP的加入和预氧化温度对复合膜形貌结构影响很大,而碳化温度则会影响复合膜的石墨化程度和电导率。