宜昌市红薯产业发展现状与对策

介绍了红薯的特性与用途,从红薯种植和产业化发展等2个方面分析了宜昌市红薯产业发展基本情况,并提出了宜昌市红薯产业发展对策。     

我国甘蔗种植作业机械化现状与发展建议

甘蔗是我国重要的经济作物,其种植作业作为甘蔗生产过程中劳动强度最大和机械化程度最低的环节之一,已经成为严重制约我国蔗糖产业在国际竞争力的技术瓶颈。文章探讨了推广甘蔗机械化种植的重要性和迫切性,对我国甘蔗种植作业机械化进程作简要的介绍,指出甘蔗种植机械化发展所面临的问题和阻碍,并结合我国甘蔗种植农艺的特点,给出了相应的解决措施。     

丘陵地区农业机械化发展存在的问题和现状

农业机械化的发展水平直接影响到农业的物质装备水平和综合生产能力,影响到农村劳动力的转移和传统农业向现代农业转变进程,如何在丘陵地区发展农业机械化是基层农机工作者长期思索和践行的问题。文章根据丘陵地区农机化发展特点和现状,提出了丘陵地区农机化发展建议。     

吉林省民营金融机构发展现状分析

吉林省中小型民营金融机构在发展中存在着资金吸引力弱,品牌认知度低,缺乏针对性的信用及风险鉴定系统等诸多问题.本文对这些问题进行了系统分析,提出引入真实的竞争、理性开发业务、重产品品牌的构建等策略.     

农业科研机构科研人员绩效考核现状分析

绩效考核工作是现代人力资源管理工作中的一项重要内容[1]。文章主要阐述了农业科研机构科研人员绩效考核的现状,分析了现行农业科研人员绩效考核工作中存在的问题,以期为建立科学合理的农业科研人员绩效考核体系提供参考。     

Acute Effects of Ivabradine on Dynamic Obstruction of the Left Ventricular Outflow Tract in Cats with Preclinical Hypertrophic Cardiomyopathy

Background

Ivabradine is a negative chronotropic drug with minimal effects on central hemodynamics. Its effect on dynamic obstruction of the left ventricular outflow tract (LVOT) in cats with hypertrophic cardiomyopathy (HCM) remains unknown.

Hypothesis/Objectives

Ivabradine reduces dynamic obstruction of the LVOT in cats with HCM.

Animals

Twenty‐eight client‐owned cats with preclinical HCM and dynamic LVOT obstruction.

Methods

Randomized, double‐blind, active‐control single dose study. Cats received a single dose of either ivabradine (0.3 mg/kg PO) or atenolol (2 mg/kg PO). Heart rate, echocardiographic variables, and systolic blood pressure (SBP) were recorded before and 3 hours after drug administration. Statistical comparisons were made using ANCOVA.

Results

Peak velocity in the LVOT was significantly decreased compared to baseline for both drugs; however, the effect was more prominent with atenolol (mean reduction 2.53 m/s; 95% CI 2.07–3.13 m/s) compared to ivabradine (mean reduction 0.32 m/s; 95% CI −0.04 to 0.71 m/s; P < .0001). Echocardiographic indices of systolic function were largely unchanged by ivabradine, but significantly reduced by atenolol.

Conclusions and Clinical Importance

A single dose of ivabradine decreases dynamic LVOT obstruction in cats with HCM, but the clinical effect is negligible and inferior compared to that achieved by atenolol.     

乳酸菌基因组学研究现状

作者对乳酸菌基因组学的研究现状,包括乳酸菌基因组测序及基本特征、乳酸菌基因代谢特点、重要的功能基因等方面进行了概述。     

Validation of body condition score as a predictor of subcutaneous fat in Nelore (Bos indicus) cows

The aim of the present study was to determine the relationship among body weight (BW), body condition score (BCS) and rump fat thickness (RFAT) measured by ultrasonography, and validate the relationship between BCS and RFAT over the time. Two hundred sixty and six Nelore cows had their BW, BCS and RFAT evaluated at five different moments during the production cycle: M1) weaning; M2) parturition, M3) 42 days post-partum; M4) 82 days post-partum and M5) 112 days post-partum. A BCS value was attributed for each cow following a 1 to 5 points scale. Ultrasonographic images for RFAT measurement were obtained using a 3.5 MHz linear transducer. Images were immediately analyzed as soon as they were formed and frozen. Body condition scores and ultrasound measurements were collected on the same day by a single trained technician. The relationship between BCS and RFAT values was investigated by regression models. The analysis of similarity among the five obtained models was performed using the proc MIXED from SAS and the correlations among variables were analyzed with proc CORR from SAS. The BCS was able to predict RFAT in Nelore cows in all different moments evaluated. Also, it was shown that BCS presented high correlation (r = 0.82 to 0.93) and relationship (R² = 0.73 to 0.92) with RFAT. However, both BCS and RFAT showed low correlation (r = 0.37 to 0.50) and relationship (R² = 0.13 to 0.25) with BW. The BCS classification by visual method using a 1 to 5 point scale, was able to predict the RFAT in Nelore cows over the time.     

基于小波分析和BP神经网络的触电信号检测模型

针对从农村低压电网总泄漏电流中检测和判断触电电流信号的难题,该文提出一种基于小波变换和BP神经网络的触电信号检测方法。首先用触电物理实验平台对动物触电信号进行实测,选择合适的小波基和分解尺度对触电实验中总泄漏电流及触电电流进行小波多分辨分析,实现原始信号的预处理;再将预处理后的波形作为样本进行神经网络学习和训练,建立从总泄漏电流波形中提取触电电流波形的神经网络耦合模型,并用此模型对未训练的样本进行触电信号的检测,检测值与实际值的平均相对误差为3.93%,说明该方法能够从总泄漏电流中检测出触电电流信号,对于     

Footprints of fixed-gear fisheries in relation to rising whale entanglements on the U.S. West Coast

On the U.S. West Coast, reports of whales entangled in fishing gear increased dramatically in 2014. In this study, a time series of fishing activity maps was developed from 2009 to 2016 for the four fixed-gear fisheries most commonly implicated in entanglements. Maps were generated using vessel monitoring system (VMS) data linked to port-level landings databases, which were related to entangled whale reports over the same time period and with modelled distributions of humpback whales Megaptera novaeangliae Borowski. Over the full study period, neither marked increases in fishing activity nor changes in fisheries footprints within regions with high whale densities were detected. By contrast, a delayed fishery opening in California due to a harmful algal bloom in spring of 2016 led to ~5–7 times average levels of Dungeness crab Metacarcinus magister (Dana) fishing activity, which was consistent with a high rate of entanglement in that year. These results are consistent with current hypotheses that habitat compression caused by a marine heatwave increased the overlap of whales with fishing activity, despite minimal changes in the fisheries themselves. This study adds to literature on bycatch of protected species in otherwise sustainable fisheries, highlighting the value of using VMS data for reducing human–wildlife conflict in the ocean.