四川大小兰沟自然保护区生物多样性特征及成因分析

本文利用已有调查资料,分析了大小兰沟自然保护生物多样性特征,认为大小兰沟自然保护区的生物多样性主要表现在物种资源的丰富性、区系成份的复杂性、起源的古老性、珍稀物种的密集性和植被类型的多样性等方面。形成多样性的原因是生物口岸效应、地理环境效应、处女地效应共同作用的结果。区内的生物多样性具有很高的科研、科考及保护价值。     

To Use Virtual x Driver to Realize Interruption Serial Communication

How to develop Virtual x Driver(VxD) in windows system bottom layer is given to realize high efficiency interrupt communication of serial port. By analyzing Virtual x Driver, Programable Interrupt Controller, how to virtually a interruption is proposed. With the operational principle of UART chip 8250, the communication of serial port is analyzed. Finally, the communication between WIN32 application and VxD is discussed, and the constitute of the VxD is given. The applied solid example expresses that method of the serial port communication is efficient.     

Wound Retractor Laparoscopic Port System for Standing Laparoscopic Cryptorchidectomy in the Horse: A Case Report

Cryptorchidectomy is the most commonly performed laparoscopic procedure in horses. However, its use for the extraction of an abdominal testis has disadvantages such as loss of a resected testis from grasp and fragmentation of the specimen because of the excessive tension required for extraction through a thick body wall. The ring wound retractor laparoscopic port system was recently used in human and small animal surgery to perform laparoscopic-assisted procedures and retrieve large specimens from the abdomen. In the present case, the wound retractor was placed as the ventral port in the right flank through a minilaparotomy. Thereafter, the cap with the gas inlet and instrument port was connected. The other two ports were placed dorsally using 10-mm stainless steel cannulas. Grasping forcep was introduced through the ventral port, and the laparoscope and vessel-sealing devices were introduced through the dorsal ports. After the testis was resected, it was retrieved from the abdomen through the retractor without the grasping forceps jaw being released. This is the first case report describing the use of the wound retractor laparoscopic port system for standing cryptorchidectomy in a horse. This system can be a feasible and safe option for flank laparoscopy in horses, and it facilitates specimen retrieval from the abdominal cavity, but further studies should confirm this preliminary report.     

对加强口岸查验防止植物物种资源流失的思考

针对近年来我国植物物种资源流失严重的情况,分析了物种流失的主要因素和途径,以及因此对经济造成的巨大损失,在目前采取措施和结合口岸实际的基础上,对进一步有效防止植物物种资源流失提出了建议和意见,包括制定相应的法规、完善口岸物种查验机构和机制、规范物种资源合作及其他任何形式交换资源的审批管理、建立物种资源信息库和远程鉴定系统、开展相关查验技术研究等。     

Single‐port laparoscopic incisional hernia repair in a horse

A 16‐year‐old Italian Saddle Horse gelding was referred for treatment of an incisional hernia that developed 7 months after a ventral midline laparotomy for treatment of acute abdominal pain. Physical examination revealed a hernia approximately 20 cm long and 15 cm wide on the ventral aspect of the abdomen. Ultrasonography revealed the dimensions of the hernia ring to be approximately 15 cm in length and 10 cm in width. A single‐port laparoscopic incisional hernia repair using an operating 0° laparoscope was performed with an appropriately sized (24 × 18 cm) piece of mesh fixed in place with simple interrupted transabdominal sutures. At 4 weeks post operatively, follow‐up physical examination and ultrasonography confirmed healing of the surgical site with no evidence of hernia recurrence. The same evaluation was done 6 months post operatively, and the horse returned to its previous level of activity 8 months post operatively. In horses, laparoscopic application of mesh should be considered among the treatment options for incisional hernia. In the present case, this technique was performed with a single port using an operative laparoscope, in contrast to the multiportal techniques reported previously. The case presented here demonstrates that single‐port laparoscopic herniorrhaphy is feasible, and allows proper placement of an expanded polytetrafluoroethylene intraperitoneal mesh in horses     

山西口岸在牛油果上截获危险性蚧虫棕榈栉圆盾蚧

棕榈栉圆盾蚧Hemiberlesia lataniae是一种对水果、蔬菜、苗木等经济类作物造成较大危害的有害生物,寄主植物和分布区域都十分广泛,2017年1月,山西口岸从澳门入境旅客携带的牛油果上首次截获该虫,本文介绍了该虫的分类地位、形态特征及与近似种的区别、寄主植物、地理分布、天敌种类、检验检疫必要性、经济重要性、防治措施。     

Surface Reconstruction and Modification of Port-Combustion Chamber Structure for a Gasoline Engine

Geometry of port-combustion chamber has an important effect on the performance of gasoline engines. Methods and approaches in reverse engineering are introduced into surface reconstruction and modification of a port-combustion chamber structure. Free-form surfaces of the port-combustion chamber structure for a gasoline engine with 4-valves and dual-ball type combustion chamber are successfully reconstructed in the reverse way through data processing, surface modeling, surface verifying, surface re-modeling and smooth evaluating etc., based on laser-scanned point cloud data of a sample work piece. It lays a foundation for imitation innovation of gasoline engine by changing the local structural characteristics and dimensions of a prototype model.     

4气门柴油机进气道的设计模拟及试验匹配研究

通过对国内外多种机型4气门柴油机进气道进行试验和数据分析,并结合自主开发4气门柴油机进气道的实践经验,提出了4气门柴油机进气道的性能影响因素和设计要点,为4气门结构更广泛地应用在国产柴油机上提供有益的借鉴。     

Study on Application of Protocol Analysis in Attack of ICMP

In this paper, the encapsulation of ICMP packets and the specifications of IP packet, ICMP packet and UDP packet are introduced. At the angle of the protocol analysis, a ICMP attack case is described the characters of attack are abtained and the corresponding countermeasures are presented.     

Ocean liner shipping services: corporate restructuring and port selection/competition

An examination is made of the nature of corporate restructuring among liner shipping companies to meet the needs of producers for logistic services within the Asia-Pacific Economic Region. This task is undertaken by detailing the development of the global alliances forged in 1996. Then their impact on port selection and competition within the Asia-Pacific Economic Region is studied with particular reference to the Trans-Pacific trade. As the composition of these alliances has already changed by mergers their likely effect on port destinies is considered.