AHK实现用快捷键快速切换输入法

 !1::
SwitchIME(00000804)
return

!2::
SwitchIME(0x04090409)
return

SwitchIME(dwLayout){
    HKL:=DllCall("LoadKeyboardLayout", Str, dwLayout, UInt, 1)
    ControlGetFocus,ctl,A
    SendMessage,0x50,0,HKL,%ctl%,A
}

Ionic Polarization-离子极化

 

	Consider a simple ionic crystal, e.g. NaCl.
		The lattice can be considered to consist of Na+ - Cl– dipoles as shown below.
				Each Na+ - Cl– pair is a natural dipole, no matter how you pair up two atoms.
				The polarization of a given volume, however, is exactly zero because for every dipole moment there is a neighboring one with exactly the same magnitude, but opposite sign.
				Note that the dipoles can not rotate; their direction is fixed.
	In an electric field, the ions feel forces in opposite directions. For a field acting as shown, the lattice distorts a little bit (hugely exaggerated in the drawing)
				The Na+ ions moved a bit to the right, the Cl– ions to the left.
				The dipole moments between adjacent NaCl - pairs in field direction are now different and there is a net dipole moment in a finite volume now.

	From the picture it can be seen that it is sufficient to consider one dipole in field direction. We have the following situation:
		Shown is the situation where the distance between the ions increases by d; the symmetrical situation, where the distance decreases by d, is obvious.
	How large is d? That is easy to calculate:
		The force F1 increasing the distance is given by
		F1  =  q · E
		With q = net charge of the ion.
		The restoring force F2 comes from the binding force, it is given as the derivative of the binding potential. Assuming a linear relation between binding force and deviation from the equilibrium distance d0, which is a good approximation for d << d0, we can write
		F2  =  kIP · d
		With kIP being the "spring constant" of the bond. kIP can be calculated from the bond structure, it may also be expressed in terms of other constants that are directly related to the shape of the interatomic potential, e.g. the modulus of elasticity or Youngs modulus.
		If we do that we simply find
		kIP  = Y  · d0
		With Y = Youngs Modulus, and d0 = equilibrium distance between atoms.
	From force equilibrium. i.e. F1 – F2 = 0, we immediately obtain the following relations:
		Equilibrium distance d
		d  =  q · E  Y  · d0
		Induced dipole moment μ (on top of the existing one)
		μ  =   q2 · E Y  · d0
		Polarization P
		P  =   N · q 2 · E Y  · d0

	Of course, this is only a very rough approximation for an idealized material and just for the case of increasing the distance. Adding up the various moments - some larger, some smaller - will introduce a factor 2 or so; but here we only go for the principle.
	For real ionic crystals we also may have to consider:
		More complicated geometries (e.g. CaF2, with ions carrying different amount of charge).
		This example was deliberatly chosen: The dielectric constant of CaF2 is of paramount interest to the semiconductor industry of the 21st century, because CaF2 is pretty much the only usable material with an index of refraction n (which is directly tied to the DK via εr = n2) that can be used for making lenses for lithography machines enabling dimensions of about 0,1 μm.
		If the field is not parallel to a major axis of the crystal (this is automatically the case in polycrystals), you have to look at the components of μ in the field direction and average over the ensemble.
	Still, the basic effects is the same and ionic polarization can lead to respectable dielectric constants εr or susceptibilities χ.
		https://www.tf.uni-kiel.de/matwis/amat/elmat_en/kap_3/backbone/r3_2_3.html#_dum_4

什么是能级简并

 

简并能级（英语：Degenerate energy level）在物理学中，简并是指被当作同一较粗糙物理状态的两个或多个不同的较精细物理状态。

例如在量子力学中，原子中的电子，由其能量确定的同一能级状态，可以有两种不同自旋量子数的状态，该能级状态是两种不同的自旋状态的简并态。

简介简并能级（英语：Degenerate energy level）在物理学中，简并是指被当作同一较粗糙物理状态的两个或多个不同的较精细物理状态。

例如在量子力学中，原子中的电子，由其能量确定的同一能级状态，可以有两种不同自旋量子数的状态，该能级状态是两种不同的自旋状态的简并态。

在统计物理学中，宏观上由压强、体积、温度确定的同一宏观热力学状态，在微观上可以对应大量不同的微观状态，该热力学状态是这些微观状态的简并态。简并在量子力学和统计物理中的意义不同，在统计物理中，简并是指量子效应明显的体系。

含有简并电子基态的非直线型分子都会产生姜-泰勒效应，而发生构型扭曲。1

量子力学量子力学（quantum mechanics）是物理学的分支，主要描写微观的事物，与相对论一起被认为是现代物理学的两大基本支柱，许多物理学理论和科学，如原子物理学、固体物理学、核物理学和粒子物理学以及其它相关的学科，都是以其为基础。

19世纪末，人们发现旧有的经典理论无法解释微观系统，于是经由物理学家的努力，在20世纪初创立量子力学，解释了这些现象。量子力学从根本上改变人类对物质结构及其相互作用的理解。除透过广义相对论描写的引力外，迄今所有基本相互作用均可以在量子力学的框架内描述（量子场论）。

爱因斯坦可能是在科学文献中最先给出术语“量子力学”的物理学者。1

统计力学统计力学（Statistical mechanics）是一个以玻尔兹曼等人提出以最大熵度理论为基础，借由配分函数将有大量组成成分（通常为分子）系统中微观物理状态（例如：动能、势能）与宏观物理量统计规律 （例如：压力、体积、温度、热力学函数、状态方程等）连结起来的科学。如气体分子系统中的压力、体积、温度。伊辛模型中磁性物质系统的总磁矩、相变温度、和相变指数。

通常可分为平衡态统计力学，与非平衡态统计力学。其中以平衡态统计力学的成果较为完整，而非平衡态统计力学至今也在发展中。统计物理其中有许多理论影响着其他的学门，如信息论中的信息熵。化学中的化学反应、耗散结构。和发展中的经济物理学这些学门当中都可看出统计力学研究线性与非线性等复杂系统中的成果。1

姜-泰勒效应姜-泰勒效应（英文：Jahn-Teller effect，简称JTE），有时也被称为姜-泰勒变形，描述了基态时有多个简并态的非线性分子的电子云在某些情形下发生的构型形变。分子发生几何构型畸变的目的是降低简并度，从而稳定其中一个状态。姜-泰勒效应主要出现在金属的配合物中，特别是某些金属染料的着色过程。2

本词条内容贡献者为:

杜强 - 高级工程师 - 中国科学院工程热物理研究所

量纲分析的方法

 举例

美国原子弹爆炸图

Taylor利用量纲分析法，计算出爆炸形成的冲击波半径R与时间t^{2/5}有关

释放的能量E、冲击波半径R、空气密度ρ、空气绝热系数γ（无量纲数）、时间t，R = E^{x_1} \rho ^ {x_2} t ^ {x_3} \gamma ^ {x_4}，用量纲分析求出未知指数，x1=1/5，x2=-1/5，x3=2/5。

根据某次原子弹爆炸的照片数据，计算出原子弹的能量。
泰勒得出在一些小型爆炸中\gamma ^ {x_4} \approx 1。
密度取1.25 kg/m^3
训练数据R,t已知
则根据公式R = E^{x_1} \rho ^ {x_2} t ^ {x_3} \gamma ^ {x_4}，可以计算出E

Von Neumann 冯诺依曼
基本量纲与导出量纲

F = m * a
F 单位 N 基本量纲 M*L/T^2
m 单位 kg 基本量纲 M
a 单位 m/s^2 基本量纲 L/T^2
无量纲量与无量纲单位

无量纲量是个没有单位的数字，量纲为1。1 m/s与1，前者纲量为L/T，后者量纲为1

无量纲量：圆周率Pi、欧拉常数e、分贝dB、弧度、应变、宾汉数、摩擦系数、欧拉数、马赫数、雷诺数、品质因子等。

无量纲单位：摩尔分数（mol/mol）、质量百分浓度（kg/kg）、度（°）、弧度（rad）等。
量纲分析

针对某一问题，如果已知R与u_1,u_2,u_2,...的模型，需要确定未知参数，可通过量纲分析来确定

举个例子：
已知R = f(u_1,u_2,...) = u_1^a * u_2 ^ b *...。[R] = [u_1]^a * [u_2]^b *...，可确定出a,b,c...。

难点：
1、确定哪些物理量有关，如确定R与u、v有关
2、确定模型，如确定R=u^a * v^b
白金汉Pi定理

白金汉Pi定理：设影响某现象的物理量数为n个，这些物理量的基本量纲为m个，则该物理现象可用n-m个独立的无量纲数群（准数）关系式表示
量纲法则：1.只有量纲相同的物理量，才能彼此相加、相减和相等； 2.指数函数、对数函数和三角函数的宗量应当是量纲1。

论文 浅谈量纲法则的合理应用
重写方程

g(u_1,u_2,u_3,...)=0
Pi_j = q_1^{a_1} * q_2^{a_2} * ...
确定常数a1~an，b1~bn，....，可将方程重写
g(u_1,u_2,u_3,...) = z(Pi_1,Pi_2,Pi_3,...)=0
疑问
https://blog.csdn.net/qq_37083038/article/details/114520770

MusicFree音源接口配置地址

 QQ音乐

http://adad23u.appinstall.life/dist/qq/index.js
一键复制

网易云音乐

https://gitee.com/raycn120/musicfree/raw/master/netease.js
一键复制

酷我音乐

http://adad23u.appinstall.life/dist/kuwo/index.js
一键复制

咪咕音乐

http://adad23u.appinstall.life/dist/migu/index.js
一键复制

Bilibili

http://adad23u.appinstall.life/dist/bilibili/index.js
一键复制

综合插件1（集合多个音乐源）

https://gitlab.com/acoolbook/musicfree/-/raw/main/music.json
一键复制

综合插件2（集合多个音乐源）

https://gitee.com/ThomasYou/musicfree/raw/master/dist/plugins.json

 https://yinghe.app/musicfree-chajian/

pdf xchange显示空白问题

 在菜单栏上点编辑>首选项>性能>缓存，设置使用系统内存的缓存大小为10或250MB,如果是很
大的文档就设置大些，勾选"不要使用磁盘缓存解码图像"；如果你的电脑显卡是集成+独显，把显卡设置为独显，在程序设置选项中添加PDF-XChange Editor。

 https://www.zhihu.com/question/595347105?write

What Are Google Search Operators?

 Google search operators are special commands you can use to find more specific information in Google.

Like this:
“site:semrush.com SEO” in Google search

The “site:” operator allows you to search for results from a specific website.

In this example, including “site:semrush.com” in your search query will show results only from semrush.com.

Many other Google search operators can make your search results more precise. They also have many practical uses for SEO.

In this post, we’ll guide you through different search operators. And show you how to use them for SEO activities. Such as:

    Building internal links
    Finding websites for guest posting
    Finding site indexing issues

Let's get started.
List of 35+ Google Search Operators

Here are the search operators Google supports:
intitle:

Searches for pages that contain a specific word in the title tag.

Try it out: intitle:pizza

This will show pages with the word “pizza” in the title tag.
allintitle:

Works like “intitle'' but will only show pages where the title tag includes all of the specified words.

Try it out: allintitle:pizza recipe
related:

Allows you to find sites related to a particular domain.

Try it out: related:nytimes.com

Googlewill show other news media sites related to nytimes.com.
OR

Finds results related to one of two search terms. In some cases, results will contain both search terms.

Try it out: pizza OR pasta

This will show pages that are related to either pizza or pasta. Or both.

Alternatively, you can use the pipe (|) operator in place of “OR.” It does the same thing.

Try it out: pizza | pasta
AND

Finds results related to both the searched terms.

Try it out: pizza AND pasta

The AND operator is usually implied in Google search queries. When entering multiple search terms, Google assumes you want to see results that include all of those terms.

So if you search for “pizza pasta,” Google will show results that include both “pizza” and “pasta” anyway.
-

The minus (-) operator excludes a particular term or phrase and shows pages that don’t include the excluded term (or terms).

Try it out: digital marketing -jobs

Google will show pages related to “digital marketing,” but not “digital marketing jobs.”
()

The parentheses “()” groups multiple terms or search operators to influence the final search.

Try it out: Tesla (Model S OR Model Y)

Google will show pages that either include “Model S” or “Model Y” in addition to “Tesla.”
*

Acts as a wild card and fills in the missing word or phrase.

Try it out: best * in Paris

Google will fill in the asterisk with different words, such as “places,” “museums,” “hotels,” “restaurants,” “tourist places,” etc.
define:

See the definition for a specific word or concept. The definition is displayed in a special dictionary box, but sometimes Google might just show websites that define the term for you.

Try it out: define:algorithm

This will serve the definition of the word “algorithm.”
filetype:

Find results of a particular file format (e.g., PDF, XLS, PPT, DOCX, etc.)

Try it out: filetype:pdf climate change

You’ll see search results for PDF files related to climate change.

Alternatively, you can use the “ext:” operator in place of “filetype:” It does the same thing.

Try it out: ext:pdf climate change
cache:

Allows you to view the most recent cached version of a webpage.

Try it out: cache:semrush.com

Google will show you the most recent cached version of our homepage.
site:

Finds results from a specific website.

Try it out: site:nytimes.com

You’ll see results only from nytimes.com.
inurl:

Finds pages that include a specific word in the URL.

Try it out: inurl:shampoo

This will return pages that have the word “shampoo” in the URL.
allinurl:

Works like “inurl” but will only return pages where the URL includes all of the specified terms.

Try it out: allinurl:best baby shampoos
weather:

Allows you to quickly see weather conditions for a particular location.

Try it out: weather:london

Google will display the current temperature, forecast, and other weather-related information.
map:

Shows a map of a specific location.

Try it out: map:new york

Google will display a map of the location. If you click on the map, it will take you to Google Maps. Where you can zoom in or zoom out and explore further.
movie:

Shows information about a specific movie.

Try it out: movie:avengers endgame

Google will display movie-related information. Like reviews, ratings, full cast and crew list, trailers, and showtimes (if it’s currently in theaters near you).
stocks:

Allows you to quickly see stock prices and other financial information of a particular company.

Try it out: stocks:tesla

Google will show the stock price, current market cap, stock chart with historic price details, and other relevant information.
intext:

Looks for pages that contain a specific word in the content.

Try it out: intext:AI

This will return pages that have the word “AI” somewhere within the content.
allintext:

Works like “intext” but will only show pages where page content contains all of the specified words.

Try it out: allintext:SEO tips

Google will show pages with both words in the content.
source:

Finds news articles from a specific source in Google News.

Try it out: tesla source:nytimes.com

You’ll see news articles about Tesla from The New York Times.
in

Lets you convert one unit to another. Applies to currency, weights, distance, temperature, time, etc.

For example, you can search for “999 USD in EUR” to see how much $999 USD is worth in euros.

Try it out: 999 usd in eur
“search term”

Using quotation marks around a search query allows you to search for an exact phrase rather than individual words.

Try it out: “best pizza in new york city”

In this example, Google will only show results that include that exact phrase, rather than “best,” “pizza,” and “new york city” separately.
AROUND(X)

Searches for pages where two words appear within the distance of “X” words from each other.

Try it out: Tesla AROUND(5) Model S

In this example, Google will return pages with words “Tesla” and “Model S” in content where they appear within five words from each other.
location:

Narrow your results to a specific location.

Try it out: location:seattle pizza

You’ll see pizza-related results specific to Seattle.
Unreliable & Deprecated Search Operators

Google search operators have been in use for years.

But did you know Google has terminated some operators? Or that some operators don’t work as effectively as they used to?

Let’s look at the non-working Google search operators. As well as the ones that return inconsistent results and shouldn’t be relied on.
blogurl:

Find all of a domain's blog URLs. The operator was useful for performing searches in Google Blog Search, which was shut down in 2011.

Example: blogurl:semrush.com

Although this operator has been deprecated, it still returns a few relevant results in a regular Google search.
#..#

Search for information within a specific range of numbers. For example, if you want to find articles about the best ’90s movies, you can use “best movies 1990..1999” as your search query.

Example: best movies 1990..1999

Our testing found that this operator returns mixed results by displaying movies for the years 1990 to 1999 but also 2000 and beyond.
inanchor:

Allowed you to find webpages that have links pointing to them using a specific anchor text.

For example, if you want to find webpages that have links pointing to them with the anchor text “books,” you can use “inanchor:books” as your search query.

Example: inanchor:books

Note: The operator no longer consistently returns relevant results.
allinanchor:

Works like “inanchor” but would only return pages where a link’s anchor text contains all specified words.

Example: allinanchor:best books 2024

Note: The operator doesn’t seem to work. You’ll often see false positives.
+

Find pages that mention a specific word or phrase exactly as written.

For example, if you search for “Semrush +team,” Google will only show you pages that have the words “Semrush” and “team” together. And not pages that have “Semrush” and “team” separately or in a different order.

Example: Semrush +team

Note: The “+” operator has been discontinued by Google. You can use quotation marks to find webpages that contain exact matches.
#

See blogs, social media posts, and news articles that used a specific #hashtag.

Example: #throwbackfriday

Note: This one doesn’t seem to work. It often returns false positives.
~

Finds pages that contain synonyms for a word or phrase.

For example, if you search for “~healthy recipes,” Google will show pages that contain words or phrases related to healthy recipes, such as nutritious recipes, low-fat recipes, wholesome recipes, etc.

Example: ~healthy recipes

Note: Google has terminated this operator. For most searches, Google automatically shows pages that include synonyms.
link:

Search for webpages that link to a specific URL. For example, if you search for “link:nytimes.com,” Google will show all webpages that link to The New York Times website.

Example: link:nytimes.com

Note: Google has deprecated this operator, as confirmed by Google’s Gary Illyes on Twitter. It doesn’t return relevant results.
info:

Find more information about a specific URL or domain. Like a cached version, similar sites, links to the site, etc.

Example: info:semrush.com

Note: Google has terminated this operator.
daterange:

Allows you to search for content that was published within a specific date range. The date range must be specified in Julian format.

Example: daterange:23001-23091 SEO

Note: We’ve found that this operator no longer works.
inpostauthor:

Search for content written by a specific author.

Example: inpostauthor:Neil Gaiman

This operator used to work in Google Blog Search, which was retired in 2011. It doesn’t work in regular Google Search.
phonebook:

Find a person’s phone number.

Example: phonebook:elon musk

Google has discontinued “phonebook:” search operator, as confirmed by a former Google employee in a blog post.
inposttitle:

Look for blog posts with specific words in the title.

Example: inposttitle:SEO tips

This operator was useful for finding relevant blog posts in Google Blog Search. It doesn’t work in regular Google Search.
How to Use Google Advanced Search Operators for SEO

Google search operators are useful for various SEO tasks. Like:

    Building internal links
    Finding site indexing issues
    Finding websites for guest posting

Let’s explore the use cases in more detail.
1. Get Internal Linking Ideas

Internal links are hyperlinks that connect one page on a website to another page on the same website.

They’re important for SEO for three main reasons:

    Internal links help users discover more content on your site
    They help search engines crawl and index your site more efficiently
    They can spread link equity (ranking power) throughout your website

To give your SEO a boost, regularly check your website for internal linking opportunities. And add links where relevant.

Google search parameters can help you generate internal linking ideas.

For example, if we want to add internal links to this guide, we can search Google with search operators like this:
site:semrush.com/blog/ “Google search operators” in search

Google will show relevant articles where we mention the phrase “Google search operators” somewhere in the content. So we can add internal links from them.
2. Find Site Indexation Issues

Indexation is the process whereby Google stores your website pages in its search index—a database containing billions of webpages.

Your webpages must be indexed by Google to appear in search results.

And to get traffic from Google.

Google search operators can check whether your website pages are indexed.

Use the “site:” search operator.

For example, if you want to check the index status of techcrunch.com, search for “site:techcrunch.com.”

This tells you roughly how many of the site’s pages Google has indexed.
number of indexed pages for “site:techcrunch.com” showing "about 474,000 results (0.22 seconds)"

Note: These are approximations. If you want to know exactly how many pages of your site Google has indexed, check Google Search Console.

You can also review whether specific pages are indexed by searching the page URL with “site:” search.

This is helpful to confirm whether Google has indexed the new articles you’ve published on your website.

For example, we recently published a new guide to learning SEO.

To confirm whether Google has indexed it, we can search for “site:semrush.com/blog/learn-seo/”
search for “site:semrush.com/blog/learn-seo/”

As you can see, the page appears in Google search results. Which means there are likely no indexation issues.
3. Find Websites for Guest Posting

Guest posting is where you write blog posts for other websites in your niche to promote your brand.

Many SEO marketers also use guest posting to build links to their site, according to a recent Twitter poll.

To find relevant guest posting opportunities for your website, search Google with one of these search operators:

    Your keyword intitle:“write for us”
    Your keyword intitle:“become an author”
    Your keyword intitle:”contribute”
    Your keyword intitle:“guest article”
    Your keyword intitle:“submit a post”
    Your keyword intitle:“submit an article”

These operators will return sites that accept guest posts within your niche.

For example, if we want to find guest posting opportunities for health and fitness websites, we’ll search Google like this:
healts intitle:"write for us"

And it will show websites accepting guest posts.
Google search results page for "healts intitle:"write for us"

Alternatively, you could also use the “inurl:” search operator.

    Your keyword inurl:“write for us”
    Your keyword inurl:“become an author”
    Your keyword inurl:”contribute”
    Your keyword inurl:“guest article”
    Your keyword inurl:“submit a post”
    Your keyword inurl:“submit an article”

healts inurl:"write for us" search results
4. Find Non-Secure Pages on Your Domain

Any pages on your website that are still using HTTP (hypertext transfer protocol) are not secure for visitors.

Their sensitive information like password and credit details can potentially be intercepted and stolen by hackers.

That’s why it’s important to switch to HTTPS (HTTP secure). Which is also a ranking factor for Google.

To find non-secure pages on your website, combine the “site:” and “-inurl:” operators.

Like this:
“site:yourwebsite.com -inurl:https”

Let’s deconstruct the Google search syntax we’re using.

Here, we’re using:

    The “site:” operator so Google looks at your entire website
    Then the exclusionary “-inurl:” operator so it only shows non-secure pages (still using HTTP)

This should reveal any non-secure pages you may have on your site.

Alternatively, Semrush’s Site Audit tool can identify non-secure pages.

Set up a project in the tool and audit your website.

After the audit is complete, go to the “Issues” tab and search for “non-secure.” The tool will show if it detected any non-secure pages.
search for “non-secure” in Site Audit "Issues" tab
5. Find Resource Pages for Link Building

Resource pages are webpages that curate and link out to useful industry resources. Like articles or tools.

Here’s what a resource page looks like:
"Responsive Resource" page

Reach out to the people who created the resource page and suggest your resource for inclusion.

If they decide to add it, you could potentially receive a backlink as well.

But how do you find websites that curate resource pages?

Google search operators can help.

Search Google with one of these Google search strings:

    Your keyword intitle:resources
    Your keyword intitle:links

    Your keyword inurl:resources
    Your keyword inurl:links

All these operators will return sites that curate and link out to relevant resources in your niche.

For example, if we want to find resource page opportunities for personal finance websites, we’ll search Google like this:
"personal finance intitle:resources" search

And it will show websites curating resources.
Google search results page for "personal finance intitle:resources"
6. Track Down Duplicate Content Issues

Duplicate content is when the exact same content appears on the web in more than one place.

It could be on your website: Two or more pages on your website display the same content.

Or someone else’s website: Some other website copy-and-pasted your content on their site.

That’s bad.

Luckily, search operators can help you find duplicate content issues.

To see whether anyone has duplicated your content, use Google operators like this:
-site:yourdomain.com "the sentence or block of text you are checking for duplicates"

Here, we’re using the exclusionary “-site:” operator so results from your own site aren’t included.

Then the quotation marks (“”) to see if your exact sentence or block of text appears anywhere else on the web.

If you notice your content is duplicated elsewhere, reach out to those sites and make sure they link back to your site with proper attribution.

Now, to find duplicate content on your own website, use the following operators.
site:yourdomain.com "the sentence or block of text you are checking for duplicates"

We’re using the “site:” operator to return results for your site only.

Then the quotation marks (“”) to see if there are multiple matching results present.

Also, Semrush’s Site Audit tool can find duplicate content issues and save you from manual search work.

Set up a project in the tool and run a full crawl of your site.

Once the crawl is complete, navigate to the “Issues” tab. Then, search for “duplicate content.”

The tool will show if you have duplicate content on your own site.
search for “duplicate content” in Site Audit "Issues" tab

Click on the “# pages” link to see a full list of pages with duplicate content. Then click on the “Why and how to fix it” button at the top of the page to get advice on how to fix it.
“Why and how to fix it” section example
7. Find Files You Don’t Want to Keep in Google’s Index

If you use special content assets (PDF files, Excel spreadsheet templates, etc.) as your lead magnets, you probably don’t want them appearing in Google search results.

That’s because users can freely access them without exchanging their contact information with your business.

This could lead to a decrease in lead generation and sales.

To check whether Google has indexed your lead magnet files, use the “site:” and “filetype:” operators.

Like this:
“site: yourdomain.com filetype:xlx”

If you see that your lead magnet files are in Google’s index, remove them by adding the “noindex” attribute.

New to the “noindex” attribute? Read our full guide to meta robots and x-robots-tag to get started.
8. Search Outreach Prospects’ Social Media Profiles

Many of the most useful link building strategies revolve around outreach.

It’s where you contact website owners—via social media, email, etc.—and give them a compelling reason to link to your content.

Use Google search operators to find your prospects’ social media profiles.

Here’re the search operators you can use:
prospect’s name site’s name (site: twitter.com OR site:facebook.com OR site:linkedin.com)

In this example, we’re using the parentheses () to group multiple operators together.

Then the “OR” operator to trigger your prospect’s profiles on any of the specified social media platforms.

So you can contact them there.
Master the Google Search Operators List

Learning how to use Google search commands is a skill. It takes time and practice to master.

But the benefits are well worth the effort.

With Google search modifiers, you can narrow your search and filter out unwanted or irrelevant results.

These operators also help you carry out regular SEO activities.

To help you master Google search operators, we’ve put together a downloadable cheat sheet.

It’s a handy reference guide to the most useful search operators.

Download our cheat sheet and start mastering Google search operators today.

 https://www.semrush.com/blog/google-search-operators/