光纤技术入门指南:探索光导纤维的奥秘

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《光纤技术现场指南》是一本深入浅出的光纤英文教材,由Rüdiger Paschotta撰写,收录于SPIE Field Guides系列的第16卷。本书旨在为读者提供全面的光纤技术概述,适合那些希望了解或在光纤领域工作的专业人士。作者以其丰富的专业知识,将复杂的光纤理论和实践应用讲解得通俗易懂。 该书内容覆盖了光纤通信的核心原理,包括光纤的基本结构、材料特性、光的传输特性以及光纤系统的组成与设计。读者可以从中了解到光纤的分类(如单模光纤、多模光纤等)、光纤的工作原理(如全反射、模式色散等)、光纤的连接技术(如熔接、连接器等)以及光纤在网络通信、数据传输、光学信号处理中的关键作用。 书中不仅包含基础理论,还涉及到了实际工程中的应用场景和案例,帮助读者掌握如何解决光纤网络中常见的问题,以及如何评估和选择合适的光纤解决方案。此外,为了方便查阅,书籍还附有详细的参考文献和索引,便于读者进一步深入研究相关主题。 版权方面,本书受到Society of Photo-Optical Instrumentation Engineers的保护,未经出版商书面许可,任何形式的复制或分发都是非法的。尽管书中提供了准确的信息,但出版社不对信息的准确性负责,也不对由此产生的任何结果承担责任。作者和出版者都致力于确保内容的可靠性,但读者在应用所学知识时需自行判断其适用性。 《光纤技术现场指南》是一本实用性强、信息全面的参考书籍,对于想要在光纤技术领域提升技能或从事相关工作的人员来说,无论是作为入门读物还是专业参考,都是不可或缺的资源。通过阅读和学习,读者将能更好地理解和掌握光纤技术,推动信息技术的进一步发展。

Import arcpy module import arcpy # Get input feature class and output feature class input_fc = arcpy.GetParameterAsText(0) output_fc = arcpy.GetParameterAsText(1) # Get field list of input feature class fields = arcpy.ListFields(input_fc) # Create a list of field names to keep field_names = ["OID@", "SHAPE@", "SHAPE_LENGTH", "SHAPE_AREA"] # Loop through input feature class fields and add field names to field_names list for field in fields: if not (field.name in field_names): # If the field name is not in the field_names list field_names.append(field.name) # Add the field name to the field_names list # Use Make Feature Layer to create a layer from the input feature class arcpy.MakeFeatureLayer_management(input_fc, "temp_layer") # Use Add Field Delimiters to get the correct syntax for field names delimited_fields = arcpy.AddFieldDelimiters("temp_layer", field_names[0]) for i in range(1, len(field_names)): delimited_fields += "," + arcpy.AddFieldDelimiters("temp_layer", field_names[i]) # Use Copy Features to create the output feature class with only the specified fields arcpy.CopyFeatures_management("temp_layer", output_fc, delimited_fields) # Delete the temporary layer arcpy.Delete_management("temp_layer")运行错误:Traceback (most recent call last): File "D:\多对一空间连接\删除所有字段.py", line 28, in <module> File "c:\program files (x86)\arcgis\desktop10.2\arcpy\arcpy\management.py", line 2429, in CopyFeatures raise e ExecuteError: 执行失败。参数无效。 ERROR 000800: 该值不是 | DEFAULTS | TEXT_UTF16 | MAX_FILE_SIZE_4GB | MAX_FILE_SIZE_256TB | GEOMETRY_OUTOFLINE | BLOB_OUTOFLINE | GEOMETRY_AND_BLOB_OUTOFLINE | TERRAIN_DEFAULTS | MOSAICDATASET_DEFAULTS | MOSAICDATASET_INLINE 的成员。 执行(CopyFeatures)失败。 执行(删除所有字段)失败。请改正代码

2023-05-25 上传

WARNINGS: ?: (staticfiles.W004) The directory 'static' in the STATICFILES_DIRS setting does not exist. buy.Cart: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'. HINT: Configure the DEFAULT_AUTO_FIELD setting or the BuyConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django.d b.models.BigAutoField'. buy.Orders: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'. HINT: Configure the DEFAULT_AUTO_FIELD setting or the BuyConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django.d b.models.BigAutoField'. sale.Brand: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'. HINT: Configure the DEFAULT_AUTO_FIELD setting or the SaleConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django. db.models.BigAutoField'. sale.Carinfo: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'. HINT: Configure the DEFAULT_AUTO_FIELD setting or the SaleConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django. db.models.BigAutoField'. userinfo.UserInfo: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'. HINT: Configure the DEFAULT_AUTO_FIELD setting or the UserinfoConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'dja ngo.db.models.BigAutoField'. No changes detected

2023-06-02 上传