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How to find the missing space in Synology NAS

最近，每天都收到群辉管家的通知磁盘空间不足，查看了下home folder下面的文件夹大小只有1.6 T。Disk station 显示占用却有5.9 T。显然有空间被其他软件占用了。查了google 和百度确认了是NAS的synology drive内的版本控制功能占用了大量的空间。原先的版本控制有32个，也就是说他会存32个版本的历史文件，这样就占用了巨大的空间。所有讲版本控制改成1就解决了问题。这个更改过程很费时间。更新后总磁盘占用显示为1.6 T。除此之外可以利用SSH客户端登陆，通过下面命令 或者存储盘的文件占用情况。

1. sudo -i 
2. cd /volume1
3. du -h -d1

More information about a similar problem can be found in the following link

Why my storage space is unexpectedly full? | Synology Community

群辉的文件系统：

这里想说下群辉的文件系统，群辉本地貌似有两套文件系统，一套是在home下的，另一套是在homes下的两个还不太一致。home下的drive貌似是全部系统。homes下面有个用户名的文件（比如rocket），在rocket下面有drive下面的全部文件夹列表，但是并包含所有的文件，应该是访问权限有关亦或是和版本控制有关，在我设置版本控制为0之后，在rocket下的所有文件都没有了，只有空的文件夹。

最近有道云笔记升级了7.0，打开以及同步非常卡，所以想到了群辉NAS有个Note Station，正好对比使用下。

登录：群辉桌面版隔一段时间需要重新输入密码，且不能记住密码。有道云笔记可以记忆登录，所以很方便。

同步速度两者都不错

界面上看有道云笔记的要好一些，有道支持markdown。

新建笔记的时候，有道云笔记的显然要大很大且醒目，更为方便。

嵌入的文件，群辉能打开pdf，但是遇到群辉不支持的文件，需要先下载文件然后才能打开，这一点来说有道更好，能直接打开，且直接保存。

导出 群辉只能导出一种后缀为.nsx的文件，有道可以导出为pdf或者word。

note命名群辉的命名比较自由，有道的有长度上的限制，且不能包含特殊符号。群辉的标题还可以重复，不过是加上了不同的时间戳。

软件启动新版本的有道云笔记启动很慢，可能是我的notes数量比较多的原因。群辉的也慢，主要群辉需要等待NAS从睡眠状态起来，大致需要1分钟?

版本更新 有道的版本更新最近过于频繁，几天一次？

广告：双十一期间有道云笔记的广告的广告有点多。特别是桌面版都有广告，而且关闭按钮采用透明隐藏设计，过分了。

STL files for a simple soft electromagnetic actuator (SEMA)

Today, I received an email from a master’s student about the dimensions of the square SEMA in our paper “Soft electromagnetic actuators”. Here, I just upload the original STL files for the fabrication of the SEMA.

I also have written a post about how to simulate the magnetic field and fitting which can be found in A method to fitting the magnetic field of a plate magnet. | Rocket Mao (maolab.cn)

Link to our paper: Soft electromagnetic actuators (science.org)

Updated 2022-10-12 10:21:15

Receive a Email asking the power supply.

Control system design for SEMA actuation

Questions:

On a related note, we are using a motor driver board with high current capabilities to actuate the SEMA and the signal is sourced from a signal generator (GWINSTEK AFG-2125). However, we have observed that when the signal generator is disconnected from the SEMA, the output peak-peak voltage holds, but when connected it is very low, on the order of a few mVolts as opposed to Volts. Have you experienced this type of phenomenon during your research?
Answer:
For the power supply, it is reasonable that the signal generator cannot deliver high power. You need an external power supply such as an amplifier (https://archiv.ew.tf.fau.de/leihgeraete/datasheet/Q023_D.pdf). I also find a document that may help you to build such a setup: https://www.accelinstruments.com/Applications/TS200/high-current-amplifier.html, it should not be so difficult.

As my previous mechanical keyboard does not work correctly after more than four-year services. The previous one is Tesoro G7N with a cherry red switch at a price of about 45 euros. the previous keyboard is fine, however, is not durable. Then now, I have to buy another one. I have several requirements: first cheery switch which is more familiar to me. second, should be an international layout or called QWERTY. Then in Amazon.de, there is not so much choice. Considering the price, I come to the Cherry G80-300N TKL RGB.

When it comes, I feel that the keys look nice, however, the case looks low quality, similar to the 10 euros dell cheap membrane keyboards. The RGB light is cool and has many built-in modes. The keyboard comes with Laser-etched ABS keycaps which are lower than the normal ones. Thus, I prefer a simple keyboard the backlight is not essential to me. the feeling of the new red silent switch is different from the traditional red switch. even though, according to the introduction of the keyboards, not so much difference between the two switches. The travel distance of the silent one is only 0.3 mm less than the traditional one. However, I can feel it, and when I play LOL with it, not so comfortable. Maybe because I am not getting used to it. The weight of the keyboard is light and easy to carry which may be an advantage if travel a lot. That’s it. considering the price of about 70 euros, it is ok. If there is no backlight version, there will be better for people like me.

Ubuntu VNC 安装之后 远程桌面灰屏。

Because of the ubuntu 22.04 using Wayland, many VNC software cannot work properly. I have tried RealVNC, but the server does not work. TeamViewer works fine, but if you try to control the server alone remotely, it is impossible because you have to click yes and agree to share your desktop on the server. The easy access function of TeamViewer does not work with Wayland.

The Ubuntu 22. 04 also has a built-in desktop share in the setting, however, it still needs you to click agree in the server which is quite stupid.

The only solution is to disable Wayland and use Xorg but it is too complex and I give up.

Then I switch the system to Deepin, everything works fine.

最近要写中文报告，所以买了个一个月的高级会员体验了下秘塔写作猫。这个软件在检查中英文标点上还是很给力的，比我自己找方便。部分错别字找得也还可以。但是总体上还是差点意思。比如“打了下基础”他就不会改成“打下了基础”。所以也不能完全依赖软件。顺便试了下改写功能，对于我来说是不适用的。具体效果如下吧，段落是我之前的一篇中文综述的摘要：

原始版本：

介电高弹体作为一种电活性软材料，具有质量轻、能量密度高、效能高、成本低、运行安静等众多优点，广泛应用于智能驱动器、传感器、俘能器、柔性显示器和软体机器人等结构与器件的设计和开发中。而稳定性分析对于介电高弹体结构与器件的寿命以及性能有非常重要的影响。本文综述了介电高弹体结构与器件在力电耦合载荷作用下的不同失稳形式及其非线性分析方法与应用。具体失稳形式包括吸合/突跳失稳、屈曲失稳和电致空穴，其中屈曲失稳中考虑了薄膜基体结构、单薄膜结构以及充气隔膜结构。我们也介绍了材料黏弹性行为对于稳定性的影响，并讨论了目前该类稳定性分析的难点和未来发展趋势。本文对于新型介电高弹体结构与器件的稳定性控制以及性能优化设计具有一定的指导意义。

普通改写（不知道为什么会出现两次高能量密度…）

高介电体是一种具有高能量密度、高能量密度、高效率、低成本、低运行噪音等电气性能的软介质，在智能驱动器、传感器、俘能器、柔性显示器、软体机器人等领域得到了广泛的应用。而稳定性分析则直接关系到介质材料的高弹性材料的使用寿命和性能。本文介绍了在力—电耦合加载下，介质高弹体的结构和器件的各种失稳类型，以及它们的非线性分析方法和应用。具体的失稳类型有吸力/弹跳失稳、屈曲失稳、电致空洞，在屈曲失稳中，既有膜基体结构，又有单层膜结构，又有充气膜结构。同时，本文还对材料的粘弹性能与稳定性的关系作了简要的论述，并就当前此类稳定分析面临的困难及今后的发展方向进行了探讨。该研究可为新型介质高弹性材料的稳定控制和性能优化设计提供参考。

强力改写（不知道为什么会出现高质量…）

高介质介质是一种具有高质量、高能量密度、高效率、低成本、低噪音等电气性能的柔性柔性介质。而稳定度的研究直接关系到介质材料的高弹性材料的使用寿命和特性。介绍了在力-电-力耦合加载下，介质高弹性材料的各种失稳定类型和非线性的计算方法和实际情况。它包含了膜基质结构、单膜结构和膨胀膜结构。同时，还对材料的粘性特性与稳定性的关系进行了综述，并指出了当前此类结构的研究困难及今后的发展方向。该研究可为新型介质、高弹性材料的稳定和性能的优化设计提供参考。

保守改写

介电高弹体作为电活性软材料，具有轻质、高能量密度、高效率、低成本、低噪音等优点，在智能驱动器、传感器、俘能器、柔性显示、软体机器人等结构和器件的设计与开发中得到广泛应用。而稳定性分析则直接影响到高弹体的介电结构和器件的寿命和性能。本文综述了电耦合作用下介电高弹体结构和器件的不同失稳形式及其非线性分析方法及应用。具体的失稳形式有吸合/跳失稳、屈曲失稳、电致空穴，其中包括薄膜基体结构、单膜结构和充气隔膜结构。本文还介绍了材料的粘弹性特性对稳定性的影响，并对目前该类稳定性分析中遇到的困难及今后的发展趋势进行了讨论。本文对新型介电高弹体结构和器件的稳定性控制和性能优化设计有一定的指导意义。

高级提示感觉也没有太大的用处，特别是专业的名词，可能会改错。比如上文中的“俘能器”被建议改成“赋能器”。可能这个软件的目标客户更多的是产品经理、公文写作的人吧。

比较大的缺点就是对于word检查字数有限制，太长了直接不工作，所以一般我都得一段一段复制检查，不是很方便。

价格如下。

赛睿鼠标对比Sensi RAW与十周年纪念版

I have two Sensei Raw mouses, one is 5 years and the other one is 7 years. Because the older one generates a high pitch sound from the sensor which is quite annoying I am thinking of buying a new one. However, the Raw is discontinued. Then I ordered the Sensei Ten.

With a new optical sensor, the Sensei Ten does not have the noise. The shape of Ten is the same as that of Raw. But I feel the quality of Ten is lower than that of Raw. First, the button is quite rough (Button 4-8), like a 10 euro cheap mouse. Second, buttons 1 and 2 are stiffer and a little bit laud when clicked(maybe because it is so new). Third, the cable skin is made of rubber which is not braided anymore and it is easier to be broken. Fourth, the wheel is not as smooth as before and the harder rubber on the wheel is not comfortable to touch compared to the previous one. One advantage of the new one is the RGB light, however, the log is painted with dots anymore (I prefer the dots).

2022-9-18 23:32:37 updated:

after several month’s use, the wheel is not smooth anymore. bad quality!

more comparisons can be found in reference [1]

After one month, the Sensei Ten generates some noise from the wheel. The light of the wheel will turn red when gaming.

1. https://www.rtings.com/mouse/tools/compare/steelseries-sensei-raw-vs-steelseries-sensei-ten/5578/5809?usage=8876&threshold=0.10

(2 months later the other Sensi Raw has a wheel problem, and cannot rotate smoothly, buy additional Sensi Ten)

Al2O3 (aluminum dioxide) has a high band gap 9 eV, a high breakdown electric field 5–30 MV/cm,7 a high relative permittivity 8.6–10, high thermal stability up to at least 1000 °C, and remains amor- phous under typical processing conditions. [1]

PVC (Polyvinyl chloride (PVC)) ‘s use as an electrical tape backing is largely due to its dielectric strength, which can reach nearly 60 MV/cm depending on material composition. Dielectric breakdown is the voltage limit above which a short circuit may occur across the tape. [2]

PET (polyethylene terephthalate) has a relative permittivity 2.1-3.5. [3][4]

1. Wu, Y.Q., Lin, H.C., Ye, P.D. and Wilk, G.D., 2007. Current transport and maximum dielectric strength of atomic-layer-deposited ultrathin Al 2 O 3 on GaAs. Applied physics letters, 90(7), p.072105.
2. https://insights.globalspec.com/article/8728/which-electrical-tape-is-right-for-your-application#:~:text=PVC’s%20use%20as%20an%20electrical,may%20occur%20across%20the%20tape.
3. Ulrych, J., Polanský, R. and Pihera, J., 2014, May. Dielectric analysis of polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) films. In Proceedings of the 2014 15th International Scientific Conference on Electric Power Engineering (EPE) (pp. 411-415). IEEE.
4. http://polymerdatabase.com/polymer%20physics/Epsilon%20Table.html

As always crash during playing this game, I try to get the reason why. Then just search the internet, got that the crash can be resolved by disabling the DirectX 12.

My platform is Windows 11, AMD 5800H+Nvidia RTX 3070 with the latest drivers.